{"id":10643,"date":"2026-06-05T09:15:52","date_gmt":"2026-06-05T09:15:52","guid":{"rendered":"https:\/\/michemicals.com\/?p=10643"},"modified":"2026-06-05T09:27:09","modified_gmt":"2026-06-05T09:27:09","slug":"soi-polypropylene-giup-tang-cuong-kha-nang-chong-nut-cho-be-tong","status":"publish","type":"post","link":"https:\/\/michemicals.com\/vi\/soi-polypropylene-giup-tang-cuong-kha-nang-chong-nut-cho-be-tong\/","title":{"rendered":"S\u1ee3i polypropylene (PP) cho b\u00ea t\u00f4ng: C\u00e1ch c\u00e1c s\u1ee3i si\u00eau m\u1ea3nh ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng n\u1ee9t co ng\u00f3t do co ng\u00f3t"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"10643\" class=\"elementor elementor-10643\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2c5eb6a5 elementor-reverse-mobile elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2c5eb6a5\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-735854e3\" data-id=\"735854e3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-389de86 elementor-align-left elementor-widget elementor-widget-post-info\" data-id=\"389de86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-2770981 elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/vi\/2026\/06\/05\/\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-calendar-week\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0 464c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V192H0v272zm64-192c0-8.8 7.2-16 16-16h288c8.8 0 16 7.2 16 16v64c0 8.8-7.2 16-16 16H80c-8.8 0-16-7.2-16-16v-64zM400 64h-48V16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v48H160V16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v48H48C21.5 64 0 85.5 0 112v48h448v-48c0-26.5-21.5-48-48-48z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>Th\u00e1ng 6 5, 2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-6cd1462 elementor-inline-item\" itemprop=\"author\">\n\t\t\t\t\t\t<a href=\"https:\/\/michemicals.com\/vi\/author\/protizerr-com\/\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-user-circle\" viewBox=\"0 0 496 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M248 104c-53 0-96 43-96 96s43 96 96 96 96-43 96-96-43-96-96-96zm0 144c-26.5 0-48-21.5-48-48s21.5-48 48-48 48 21.5 48 48-21.5 48-48 48zm0-240C111 8 0 119 0 256s111 248 248 248 248-111 248-248S385 8 248 8zm0 448c-49.7 0-95.1-18.3-130.1-48.4 14.9-23 40.4-38.6 69.6-39.5 20.8 6.4 40.6 9.6 60.5 9.6s39.7-3.1 60.5-9.6c29.2 1 54.7 16.5 69.6 39.5-35 30.1-80.4 48.4-130.1 48.4zm162.7-84.1c-24.4-31.4-62.1-51.9-105.1-51.9-10.2 0-26 9.6-57.6 9.6-31.5 0-47.4-9.6-57.6-9.6-42.9 0-80.6 20.5-105.1 51.9C61.9 339.2 48 299.2 48 256c0-110.3 89.7-200 200-200s200 89.7 200 200c0 43.2-13.9 83.2-37.3 115.9z\"><\/path><\/svg>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-author\">\n\t\t\t\t\t\t\t\t\t\tmichem\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-2f2df7f8 e-flex e-con-boxed e-con e-parent\" data-id=\"2f2df7f8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-17421142 e-con-full e-flex e-con e-child\" data-id=\"17421142\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2f3725e4 e-con-full e-flex e-con e-child\" data-id=\"2f3725e4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2e170ee2 elementor-widget elementor-widget-heading\" data-id=\"2e170ee2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10ccbac1 elementor-widget elementor-widget-text-editor\" data-id=\"10ccbac1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Every concrete slab, wall, or structural element is vulnerable during the critical window between placement and initial set. In this plastic state, concrete can develop surface cracks before it has developed any tensile strength to resist them. These\u00a0<strong>plastic shrinkage cracks<\/strong>\u00a0are one of the most common, frustrating, and costly defects in concrete construction \u2014 and polypropylene (PP) fiber is the most economical solution available.<\/p><p>This technical guide explains the mechanism of plastic shrinkage cracking, how PP micro-fibers interrupt it, and what to look for when specifying fiber for your concrete mix.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5b0859b3 e-flex e-con-boxed e-con e-parent\" data-id=\"5b0859b3\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-89e6a8f e-con-full e-flex e-con e-child\" data-id=\"89e6a8f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-fa20bba e-con-full e-flex e-con e-child\" data-id=\"fa20bba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-6be7b356 e-con-full e-flex e-con e-child\" data-id=\"6be7b356\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-270e26c elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"270e26c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__270e26c\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__270e26c\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__270e26c\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63f7902e elementor-widget elementor-widget-heading\" data-id=\"63f7902e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Understanding Plastic Shrinkage Cracking<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-995f18b elementor-widget elementor-widget-text-editor\" data-id=\"995f18b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Plastic shrinkage cracks occur during the\u00a0<strong>first 1\u20136 hours after concrete placement<\/strong>, before the concrete has hardened. They are caused by:<\/p><h3>Primary trigger: Rapid evaporation of bleed water<\/h3><p>When concrete is placed, heavier aggregates and cement particles settle, pushing a thin layer of water to the surface \u2014 this is bleed water. As long as bleed water evaporates at the same rate it migrates to the surface, the concrete is safe. But when evaporation rate exceeds bleed rate, the surface concrete layer begins to desiccate while still in the plastic state.<\/p><p>The resulting volumetric contraction \u2014 with no tensile strength to resist it \u2014 tears the surface into a network of cracks, typically:<\/p><ul><li>3\u201315 mm deep<\/li><li>0.1\u20133 mm wide<\/li><li>Spaced 50\u2013500 mm apart<\/li><li>Diagonal or random pattern<\/li><\/ul><h3>Risk factors that amplify plastic shrinkage:<\/h3><ul><li>High ambient temperature (&gt;30\u00b0C)<\/li><li>Low relative humidity (&lt;50%)<\/li><li>Wind speed &gt; 10 km\/h<\/li><li>Hot and dry substrate<\/li><li>Large flat slab geometry<\/li><\/ul><p>In Middle Eastern construction \u2014 where summer temperatures regularly exceed 45\u00b0C with low humidity and constant wind \u2014\u00a0<strong>every concrete placement is at risk<\/strong>\u00a0of plastic shrinkage cracking without appropriate countermeasures.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e3d5b55 elementor-widget elementor-widget-heading\" data-id=\"e3d5b55\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How PP Micro-Fiber Solves the Problem<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59e64e6 elementor-widget elementor-widget-text-editor\" data-id=\"59e64e6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>PP polypropylene micro-fibers work through a fundamentally different mechanism than curing compounds, evaporation retarders, or surface misting. Rather than controlling the environment, they change the internal structure of the concrete.<\/p><h3>The fiber reinforcement mechanism:<\/h3><p>When PP fibers are dispersed throughout fresh concrete (typically 0.6\u20131.2 kg\/m\u00b3), they create a\u00a0<strong>three-dimensional micro-reinforcement network<\/strong>\u00a0at a density of approximately 70\u2013100 million fiber filaments per kilogram. This network:<\/p><ol><li><p><strong>Bridges micro-cracks as they initiate<\/strong>\u00a0\u2014 instead of a crack propagating from a point, it encounters thousands of fiber bridges that must all be broken or pulled out simultaneously<\/p><\/li><li><p><strong>Redistributes shrinkage stress<\/strong>\u00a0\u2014 stress concentration at incipient crack tips is dispersed across the fiber network, reducing peak tensile stress below the tensile strength of the paste<\/p><\/li><li><p><strong>Reduces settlement cracking<\/strong>\u00a0\u2014 fibers mechanically resist differential settlement of aggregate particles that creates surface tears<\/p><\/li><li><p><strong>Holds concrete matrix together<\/strong>\u00a0\u2014 even if micro-cracking occurs, fibers prevent cracks from widening and interconnecting into large, visible defects<\/p><\/li><\/ol><p>The result is a concrete surface that may develop hairline micro-cracks (unavoidable at the crystal scale) but does not develop the visible macro-cracks that create durability problems, aesthetic failures, and client complaints.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-27f989f elementor-widget elementor-widget-heading\" data-id=\"27f989f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">PP Fiber vs. Other Crack Control Methods<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d28243 elementor-widget elementor-widget-text-editor\" data-id=\"6d28243\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<table><thead><tr><th>Method<\/th><th>Cost<\/th><th>Effectiveness<\/th><th>Implementation Complexity<\/th><\/tr><\/thead><tbody><tr><td><strong>PP micro-fiber<\/strong><\/td><td>Low (\u20ac1\u20133\/m\u00b3)<\/td><td>High (plastic stage)<\/td><td>Very easy (add to mixer)<\/td><\/tr><tr><td>Evaporation retarder spray<\/td><td>Low<\/td><td>Medium<\/td><td>Requires timing and re-application<\/td><\/tr><tr><td>Windbreaks \/ sunshades<\/td><td>Medium-High<\/td><td>Medium<\/td><td>Requires temporary structures<\/td><\/tr><tr><td>Curing compounds<\/td><td>Low-Medium<\/td><td>Low (post-crack)<\/td><td>Simple but late intervention<\/td><\/tr><tr><td>Steel fiber<\/td><td>High<\/td><td>High (post-crack)<\/td><td>Requires mix redesign<\/td><\/tr><tr><td>Synthetic macro-fiber<\/td><td>Medium<\/td><td>Medium<\/td><td>Easy but targets different failure mode<\/td><\/tr><tr><td>Wire mesh \/ rebar<\/td><td>High<\/td><td>Post-crack only<\/td><td>Structural design change<\/td><\/tr><\/tbody><\/table><p><strong>Key insight<\/strong>: PP micro-fiber is the only intervention that acts at the\u00a0<strong>initiation<\/strong>\u00a0stage of plastic shrinkage cracking, before the crack forms. All other methods either reduce the driving force (evaporation) or provide post-crack load transfer (steel, macro-fiber, reinforcement).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d6805c8 elementor-widget elementor-widget-heading\" data-id=\"d6805c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Technical Specifications: Tenabrix PP Fiber<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0177a75 elementor-widget elementor-widget-text-editor\" data-id=\"0177a75\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<table><thead><tr><th>Property<\/th><th>Specification<\/th><\/tr><\/thead><tbody><tr><td>Material<\/td><td>100% virgin polypropylene<\/td><\/tr><tr><td>Type<\/td><td>Monofilament micro-fiber<\/td><\/tr><tr><td>Length<\/td><td>6 mm, 12 mm, 19 mm (available)<\/td><\/tr><tr><td>Diameter<\/td><td>18\u201320 \u03bcm<\/td><\/tr><tr><td>Tensile strength<\/td><td>\u2265450 MPa<\/td><\/tr><tr><td>Elastic modulus<\/td><td>\u22653.5 GPa<\/td><\/tr><tr><td>Elongation at break<\/td><td>\u226425%<\/td><\/tr><tr><td>Density<\/td><td>0.91 g\/cm\u00b3<\/td><\/tr><tr><td>Melting point<\/td><td>160\u2013170\u00b0C<\/td><\/tr><tr><td>Acid\/alkali resistance<\/td><td>Excellent<\/td><\/tr><tr><td>Electrical conductivity<\/td><td>Non-conductive<\/td><\/tr><tr><td>Compliance<\/td><td>ASTM C1116, EN 14889-2<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf28a64 elementor-widget elementor-widget-heading\" data-id=\"cf28a64\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Dosage Recommendations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8b4c3eb elementor-widget elementor-widget-text-editor\" data-id=\"8b4c3eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Standard dosage: 0.6\u20131.0 kg\/m\u00b3<\/strong>\u00a0(typically a 150g or 600g bag per m\u00b3 of concrete, added to the mixer)<\/p><table><thead><tr><th>Application<\/th><th>Recommended Dosage<\/th><\/tr><\/thead><tbody><tr><td>Residential floor slabs<\/td><td>0.6\u20130.9 kg\/m\u00b3<\/td><\/tr><tr><td>Industrial floors (warehouse, factory)<\/td><td>0.9\u20131.2 kg\/m\u00b3<\/td><\/tr><tr><td>Exposed exterior slabs (hot climate)<\/td><td>1.0\u20131.5 kg\/m\u00b3<\/td><\/tr><tr><td>Shotcrete \/ tunnel lining<\/td><td>1.0\u20132.0 kg\/m\u00b3<\/td><\/tr><tr><td>Precast concrete panels<\/td><td>0.6\u20131.0 kg\/m\u00b3<\/td><\/tr><tr><td>Concrete roads and pavements<\/td><td>0.9\u20131.2 kg\/m\u00b3<\/td><\/tr><\/tbody><\/table><blockquote><p><strong>Dosage tip<\/strong>: Fiber length selection is important. 6 mm fibers are ideal for shotcrete and pump-applied concrete (minimum flow restriction). 12 mm is the industry standard for ready-mix and site-batched concrete. 19 mm provides enhanced post-crack performance in high-impact applications.<\/p><\/blockquote>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-309b181 elementor-widget elementor-widget-heading\" data-id=\"309b181\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mix Design Considerations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f381f4f elementor-widget elementor-widget-text-editor\" data-id=\"f381f4f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>PP fiber integrates into any conventional concrete mix without special equipment or design changes:<\/p><h3>Mixing procedure:<\/h3><ol><li>Charge aggregates and half of the mix water into the drum mixer<\/li><li>Add PP fiber bags (or bulk fiber if metered automatically)<\/li><li>Run mixer for 60 seconds at mixing speed<\/li><li>Add cement, admixtures, and remaining water<\/li><li>Mix for minimum 2\u20133 minutes until complete fiber dispersion is confirmed<\/li><\/ol><h3>Compatibility:<\/h3><ul><li>Compatible with all Portland cement types (OPC, SRPC, Blended)<\/li><li>Compatible with fly ash, slag, silica fume<\/li><li>Compatible with all chemical admixtures: superplasticizers, retarders, accelerators, air entraining agents<\/li><\/ul><h3>Effect on fresh concrete properties:<\/h3><ul><li>Slump: Reduces slightly (10\u201320 mm); compensate with small superplasticizer adjustment<\/li><li>Air content: No significant change<\/li><li>Setting time: No effect<\/li><li>Bleed water: Slight reduction (beneficial for plastic shrinkage)<\/li><\/ul><h3>Effect on hardened concrete properties:<\/h3><ul><li>Compressive strength: Negligible (\u00b15%)<\/li><li>Flexural strength: Modest improvement (+5\u201315%)<\/li><li>Toughness \/ energy absorption: Significant improvement<\/li><li>Abrasion resistance: Improved (especially with higher dosages)<\/li><li>Spalling resistance (fire): Dramatically improved \u2014 PP fiber melts at ~160\u00b0C, creating micro-channels that allow steam pressure to escape<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43d8beb elementor-widget elementor-widget-heading\" data-id=\"43d8beb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">PP Fiber and Fire Resistance: The Tunnel Lining Application<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d10dc18 elementor-widget elementor-widget-text-editor\" data-id=\"d10dc18\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>One of the most important applications of PP fiber in hot climate markets is\u00a0<strong>fire resistance spalling prevention<\/strong>\u00a0in tunnels and underground structures. During fire:<\/p><ol><li>Concrete temperatures rise rapidly<\/li><li>Pore water converts to steam<\/li><li>Steam pressure builds faster than it can escape through impermeable dense concrete<\/li><li>Explosive spalling tears chunks off structural members<\/li><\/ol><p>PP fibers melt before the critical temperature is reached, creating a network of micro-channels (pore relief channels) that allow steam to escape without explosive pressure buildup. This is the basis for the EN 1992-1-2 fire design requirement for PP fiber in concrete structures with fire resistance class \u2265R60.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b53ae4 elementor-widget elementor-widget-heading\" data-id=\"2b53ae4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Real-World Performance Data<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a9f599 elementor-widget elementor-widget-text-editor\" data-id=\"2a9f599\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A comparative study of concrete slabs placed under summer conditions in Saudi Arabia (42\u00b0C, 35% RH, wind speed 15 km\/h) showed:<\/p><table><thead><tr><th>Mix<\/th><th>Plastic Shrinkage Crack Width (avg.)<\/th><th>Crack Area per m\u00b2<\/th><\/tr><\/thead><tbody><tr><td>Control (no fiber)<\/td><td>1.8 mm<\/td><td>380 mm\u00b2\/m\u00b2<\/td><\/tr><tr><td>PP fiber 0.6 kg\/m\u00b3<\/td><td>0.4 mm<\/td><td>65 mm\u00b2\/m\u00b2<\/td><\/tr><tr><td>PP fiber 0.9 kg\/m\u00b3<\/td><td>0.15 mm<\/td><td>18 mm\u00b2\/m\u00b2<\/td><\/tr><tr><td>PP fiber 1.2 kg\/m\u00b3<\/td><td>Undetectable<\/td><td>&lt;5 mm\u00b2\/m\u00b2<\/td><\/tr><\/tbody><\/table><p>Crack reduction at standard dosage:\u00a0<strong>83\u201395%<\/strong>\u00a0compared to unreinforced concrete.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d25827c elementor-widget elementor-widget-heading\" data-id=\"d25827c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Market Applications in the GCC and India<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8787f09 elementor-widget elementor-widget-text-editor\" data-id=\"8787f09\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Saudi Arabia \/ UAE:<\/strong>\u00a0The Vision 2030 infrastructure program includes an unprecedented volume of flat concrete work: airport terminals, metro stations, residential compounds, and industrial facilities. Contractors are increasingly mandated to include PP fiber in floor slab specifications. Key specifiers include Saudi Aramco, SABIC, NEOM project contractors, and Abu Dhabi&#8217;s TDIC.<\/p><p><strong>India:<\/strong>\u00a0The Pradhan Mantri Awas Yojana (PMAY) housing scheme and national highway expansion program represent massive concrete placement volumes. PP fiber adoption is growing rapidly as Indian concrete contractors encounter the same quality problems that drove Western markets to adopt fiber reinforcement 30 years ago.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-191a2b8 elementor-widget elementor-widget-heading\" data-id=\"191a2b8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2cf6054 elementor-widget elementor-widget-accordion\" data-id=\"2cf6054\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-4711\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-4711\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Does PP fiber replace rebar or wire mesh? <\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-4711\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-4711\"><p>No. PP micro-fiber is not structural reinforcement. It controls plastic shrinkage cracks specifically. For structural load capacity, rebar and mesh remain essential.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-4712\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-4712\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Will I see fibers on the surface after finishing?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-4712\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-4712\"><p>Properly dosed PP micro-fiber (\u22641.0 kg\/m\u00b3) should not be visible after standard trowel finishing. Excess fiber &#8220;fuzz&#8221; on the surface can be burned off with a propane torch, or sanded\/ground.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-4713\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-4713\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How do I know the fiber is properly dispersed?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-4713\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-4713\"><p>Break a fresh concrete sample after mixing. Fiber filaments should be individually visible throughout the cross-section without clumping. Fiber balls (undispersed clumps) indicate insufficient mixing time.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-4714\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-4714\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"icon icon-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"icon icon-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Can PP fiber be used in self-compacting concrete (SCC)?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-4714\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-4714\"><p>Yes, but fiber length should be limited to 6\u201312 mm for SCC applications to maintain the required flow characteristics.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-246e249 elementor-widget elementor-widget-heading\" data-id=\"246e249\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-47741b0 elementor-widget elementor-widget-text-editor\" data-id=\"47741b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>PP polypropylene micro-fiber is a low-cost, high-impact solution to one of the most persistent problems in concrete construction. At less than \u20ac3 per m\u00b3 of concrete, it provides insurance against plastic shrinkage cracks that cost many times more to repair \u2014 and in facade or floor slab applications, may be aesthetically irreparable.<\/p><p>For contractors, specifiers, and ready-mix concrete producers in the GCC, India, and Southeast Asia, PP fiber is not a luxury \u2014 it is basic engineering practice.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e521c3d elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"5e521c3d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-navigation.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation\" role=\"navigation\" aria-label=\"Post Navigation\">\n\t\t\t<div class=\"elementor-post-navigation__prev elementor-post-navigation__link\">\n\t\t\t\t<a href=\"https:\/\/michemicals.com\/vi\/chat-sieu-deo-cho-be-tong-duc-san-co-cuong-do-som\/\" rel=\"prev\"><span class=\"post-navigation__arrow-wrapper post-navigation__arrow-prev\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-left\" viewBox=\"0 0 320 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M34.52 239.03L228.87 44.69c9.37-9.37 24.57-9.37 33.94 0l22.67 22.67c9.36 9.36 9.37 24.52.04 33.9L131.49 256l154.02 154.75c9.34 9.38 9.32 24.54-.04 33.9l-22.67 22.67c-9.37 9.37-24.57 9.37-33.94 0L34.52 272.97c-9.37-9.37-9.37-24.57 0-33.94z\"><\/path><\/svg><span class=\"elementor-screen-only\">Prev<\/span><\/span><span class=\"elementor-post-navigation__link__prev\"><span class=\"post-navigation__prev--title\">Superplasticizer for Precast Concrete: Achieving High Early Strength Without Compromising Long-Term Performance<\/span><\/span><\/a>\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation__separator-wrapper\">\n\t\t\t\t\t<div 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elementor-size-default\">Your\nReliable\nPartner\nFor\nCellulose\nEthers<\/div>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7abf7276 elementor-widget elementor-widget-button\" data-id=\"7abf7276\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjMxMzYiLCJ0b2dnbGUiOmZhbHNlfQ%3D%3D\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Get Brand Brochure<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4015e570 e-con-full e-flex e-con e-child\" data-id=\"4015e570\" data-element_type=\"container\" data-e-type=\"container\" 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40 127.2 40h21.299c62.542 0 98.8-38.658 99.94-91.145 12.482-17.813 18.491-40.785 15.985-62.791A93.148 93.148 0 0 0 393.152 304H428.8c45.435 0 83.2-37.584 83.2-83.2 0-45.099-38.101-83.2-83.2-83.2zm0 118.4h-91.026c12.837 14.669 14.415 42.825-4.95 61.05 11.227 19.646 1.687 45.624-12.925 53.625 6.524 39.128-10.076 61.325-50.6 61.325H248c-45.491 0-77.21-35.913-120-39.676V215.571c25.239-2.964 42.966-21.222 59.075-39.596 11.275-12.65 21.725-25.3 30.799-39.875C232.355 112.712 244.006 80 252.8 80c23.375 0 44 8.8 44 35.2 0 35.2-26.4 53.075-26.4 70.4h158.4c18.425 0 35.2 16.5 35.2 35.2 0 18.975-16.225 35.2-35.2 35.2zM88 384c0 13.255-10.745 24-24 24s-24-10.745-24-24 10.745-24 24-24 24 10.745 24 24z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Contact Us<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4fd6baef elementor-widget elementor-widget-text-editor\" data-id=\"4fd6baef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Please contact me for the latest quote or to request a sample test (our samples are free and include shipping).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6662c852 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"6662c852\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New Form\">\n\t\t\t<input type=\"hidden\" name=\"post_id\" value=\"10643\"\/>\n\t\t\t<input type=\"hidden\" name=\"form_id\" value=\"6662c852\"\/>\n\t\t\t<input type=\"hidden\" name=\"referer_title\" value=\"Page Not Found - Michem Chemical\" \/>\n\n\t\t\t\n\t\t\t<div class=\"elementor-form-fields-wrapper elementor-labels-above\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-name elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[name]\" id=\"form-field-name\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Name\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-tel elementor-field-group elementor-column elementor-field-group-Phone elementor-col-100 elementor-field-required\">\n\t\t\t\t\t<span class=\"ccfef-editor-intl-input\" data-id=\"form-field-Phone\" data-field-id=\"c8411e0\" data-default-country=\"us\" data-include-countries=\"\" data-exclude-countries=\"\" data-dial-code-visibility=\"show\" data-strict-mode=\"no\" style=\"display: none;\"><\/span>\t\t<input size=\"1\" type=\"tel\" name=\"form_fields[Phone]\" id=\"form-field-Phone\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" required=\"required\" pattern=\"[0-9()#&amp;+*-=.]+\" title=\"Only numbers and phone characters (#, -, *, etc) are accepted.\">\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-email elementor-field-group elementor-column elementor-field-group-email elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-Company 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n\u1ee9t do co ng\u00f3t nh\u1ef1a l\u00e0 m\u1ed9t trong nh\u1eefng khuy\u1ebft t\u1eadt ph\u1ed5 bi\u1ebfn, g\u00e2y phi\u1ec1n to\u00e1i v\u00e0 t\u1ed1n k\u00e9m nh\u1ea5t trong x\u00e2y d\u1ef1ng b\u00ea t\u00f4ng \u2014 v\u00e0 s\u1ee3i polypropylene (PP) l\u00e0 gi\u1ea3i ph\u00e1p kinh t\u1ebf nh\u1ea5t hi\u1ec7n 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