{"id":4683,"date":"2022-08-10T09:44:32","date_gmt":"2022-08-10T05:14:32","guid":{"rendered":"https:\/\/afzir.com\/en\/?post_type=product&#038;p=4683"},"modified":"2023-07-05T17:41:29","modified_gmt":"2023-07-05T13:11:29","slug":"viscosity-modifying-admixture","status":"publish","type":"product","link":"https:\/\/afzir.com\/en\/products\/viscosity-modifying-admixture\/","title":{"rendered":"Viscosity Modifying Admixture"},"content":{"rendered":"<p>[scroll_to link=&#8221;#overview&#8221; bullet=&#8221;false&#8221;]<\/p>\n<p>[row padding=&#8221;0 0px 0px 0px&#8221;]<\/p>\n<p>[col span__sm=&#8221;12&#8243;]<\/p>\n<h3 class=\"title-en\">PRODUCT DESCRIPTION<\/h3>\n<p>[\/col]<br \/>\n[col span__sm=&#8221;12&#8243; margin=&#8221;0px 0px 50px 0px&#8221;]<\/p>\n<p style=\"text-align: left;\">Thickening additives, also known as viscosity modifying additives (VMA), stabilizing additives, viscosity-enhancing admixtures (VEA), and water retaining additives (AWA), represent one of the latest innovations in the field of concrete chemical admixtures.<br \/>Concrete serves various purposes in construction in its fresh and hardened states. The quality of hardened concrete is often influenced by the properties of fresh concrete, which in turn, impacts its durability. It is crucial to correctly proportion the concrete and maintain homogeneity during placement and compaction to prevent bleeding, segregation, honeycombing, settlement, cracking, and air voids. These factors can significantly diminish the quality and durability of hardened concrete.<br \/>Through advancements in concrete technology and the meticulous selection of its components, the properties of concrete meet the specific requirements of individual projects. This allows for faster construction, more efficient structures, increased reliability, higher ultimate strength, and accelerated attainment of strength compared to traditional methods. Modern concretes, such as self-compacting concrete, high-performance concrete, underwater concrete, and pumpable concrete, exhibit greater sensitivity to variations in material properties and fluctuations during production than conventional concrete.<br \/>Workshop-produced concrete products encounter challenges in achieving uniform production due to daily changes in moisture content, aggregate granularity, and the fine grains of sand. By incorporating viscosity-modifying admixtures (VMA), the resulting concrete becomes more resilient to fluctuations in concrete ingredients and workshop conditions. Consequently, it becomes easier to control the quality of concrete using thickening materials and work with this type of concrete in a workshop environment.<br \/>Concrete formulations that incorporate viscosity-modifying admixture materials exhibit improved bond strength with rebars. One particular concern in deep concrete beams is the &#8220;effect of the upper rebar.&#8221; This phenomenon arises in structures with significant depth, where water leakage from the concrete reduces the bond strength of horizontal rebars positioned near the top of the cross-section compared to the lower reinforcements near the base. Utilizing viscosity-modifying admixtures and appropriate formulations can mitigate the effect of the upper reinforcement by minimizing water loss and enhancing the interface between the reinforcement and concrete.<\/p>\n<p>[\/col]<br \/>\n[col span=&#8221;6&#8243; span__sm=&#8221;12&#8243; margin=&#8221;0px 0px -14px 0px&#8221; max_width=&#8221;450px&#8221; class=&#8221;product-future&#8221;]<\/p>\n<h2>Features<\/h2>\n<hr \/>\n<ul>\n<li>\u00a0Reduction of segregation in concrete with high fluidity<\/li>\n<li>Reduction of Scouring in underwater concreting<\/li>\n<li>\u00a0Reduction of segregation in pumped concrete.<\/li>\n<li>\u00a0Compensating for the lack of filler in sand<\/li>\n<li>\u00a0The possibility of reducing the powder content in self-compacting concrete<\/li>\n<li>\u00a0Reduction of bleeding of concrete<\/li>\n<li>\u00a0Improving strength before curing in semi-dry concrete<\/li>\n<li>\u00a0Less sensitivity to changes in moisture content of aggregates<\/li>\n<li>\u00a0Providing stability for further injection of the mixture without the risk of separation<\/li>\n<li>\u00a0Reduction of molding pressure due to thixotropic effect<\/li>\n<li>\u00a0Making concrete more durable<\/li>\n<li>\u00a0Reducing the environmental risks caused by the washing of cement particles<\/li>\n<li>\u00a0Non-blocking due to concrete remaining fluid, homogeneous and resistant to separation even under high pressure pumping<\/li>\n<li>\u00a0When used in combination with super-plasticizer additives, it increases output to create optimal pumping pressure<\/li>\n<li>\u00a0Reduction of wear due to the plasticizer effect of additives<\/li>\n<li>\u00a0Reduction of sagging and dimensional stability of concrete components<\/li>\n<\/ul>\n<p>[\/col]<br \/>\n[col span=&#8221;6&#8243; span__sm=&#8221;12&#8243; margin=&#8221;0px 0px -14px 0px&#8221; max_width=&#8221;450px&#8221; class=&#8221;product-future&#8221;]<\/p>\n<h2>Applications<\/h2>\n<hr \/>\n<ul>\n<li>\u00a0Construction of self-compacting concrete<\/li>\n<li>\u00a0Concrete under water<\/li>\n<li>\u00a0Low cement SCC concrete mix designs<\/li>\n<li>\u00a0High strength concrete<\/li>\n<li>\u00a0High durability concrete<\/li>\n<li>\u00a0Precast concrete<\/li>\n<li>\u00a0Bulk concrete<\/li>\n<li>\u00a0Porous concrete<\/li>\n<li>\u00a0Powdered concrete<\/li>\n<li>\u00a0Sprayed concrete<\/li>\n<li>\u00a0Semi-dry concrete<\/li>\n<li>\u00a0Architectural concrete with coarse aggregate on the surface<\/li>\n<li>\u00a0Prestressed concrete<\/li>\n<li>\u00a0Grout injection<\/li>\n<li>\u00a0Covering tunnels<\/li>\n<li>\u00a0Structural grout (to provide a smooth and flat surface for the base of machines)<\/li>\n<\/ul>\n<p>[\/col]<\/p>\n<p>[\/row]<br \/>\n[row padding=&#8221;0 0px 0px 0px&#8221;]<\/p>\n<p>[col span=&#8221;6&#8243; span__sm=&#8221;12&#8243; margin=&#8221;0px 0px -14px 0px&#8221; max_width=&#8221;450px&#8221; class=&#8221;product-future&#8221;]<\/p>\n<h2>Packaging<\/h2>\n<hr \/>\n<ul>\n<li>&#8211;<\/li>\n<\/ul>\n<p>[\/col]<br \/>\n[col span=&#8221;6&#8243; span__sm=&#8221;12&#8243; margin=&#8221;0px 0px -14px 0px&#8221; max_width=&#8221;450px&#8221; class=&#8221;product-future&#8221;]<\/p>\n<h2>Colour<\/h2>\n<hr \/>\n<ul>\n<li>Cream<\/li>\n<\/ul>\n<p>[\/col]<\/p>\n<p>[\/row]<br \/>\n[gap height=&#8221;50px&#8221;]<\/p>\n<p>[scroll_to link=&#8221;#productdetails&#8221; bullet=&#8221;false&#8221;]<\/p>\n<p>[title style=&#8221;center&#8221; text=&#8221;technical specifications&#8221; margin_top=&#8221;90px&#8221;]<\/p>\n<p>[accordion]<\/p>\n<p>[accordion-item title=&#8221;Physical Properties&#8221;]<\/p>\n<table width=\"103%\">\n<tbody>\n<tr>\n<td width=\"51%\">\n<p style=\"text-align: center;\">Color<\/p>\n<\/td>\n<td style=\"text-align: center;\" width=\"48%\">cream<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" width=\"51%\">Physical base<\/td>\n<td width=\"48%\">\n<p style=\"text-align: center;\">liquid<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"51%\">\n<p style=\"text-align: center;\">density<\/p>\n<\/td>\n<td style=\"text-align: center;\" width=\"48%\">1.074<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" width=\"51%\">Chloride<\/td>\n<td width=\"48%\">\n<p style=\"text-align: center;\">Less than 0.1<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>[\/accordion-item]<br \/>\n[accordion-item title=&#8221;Mechanical Properties&#8221;]<\/p>\n<p>[\/accordion-item]<br \/>\n[accordion-item title=&#8221;For Engineers&#8221;]<\/p>\n<ul>\n<li><strong>Familiarize yourself with the product:<\/strong> Understand the properties and application guidelines of the specific VMA\u2122 product.<\/li>\n<li><strong>Conduct material testing:<\/strong> Perform tests to assess compatibility and determine optimal dosage of VMA\u2122.<\/li>\n<li><strong>Design concrete mixtures:<\/strong> Incorporate VMA\u2122 into mix designs to meet project requirements.<\/li>\n<li><strong>Collaborate with suppliers:<\/strong> Seek supplier expertise for guidance and troubleshooting.<br \/>Quality control during production: Implement rigorous measures to maintain the desired rheology.<\/li>\n<li><strong>Field trials and performance evaluation:<\/strong> Validate VMA\u2122&#8217;s effectiveness in real-world conditions and adjust if needed.<\/li>\n<li><strong>Document and share experiences:<\/strong> Maintain records and share information to enhance understanding.<\/li>\n<li><strong>Stay updated with advancements:<\/strong> Stay informed about the latest VMA\u2122 technology and industry practices.<\/li>\n<\/ul>\n<p>[\/accordion-item]<br \/>\n[accordion-item title=&#8221;For Contractors&#8221;]<\/p>\n<ul>\n<li><strong>Understand the VMA\u2122 product:<\/strong> Familiarize yourself with its properties and guidelines.<\/li>\n<li><strong>Communication with engineers and designers:<\/strong> Maintain open communication and discuss project requirements.<\/li>\n<li><strong>Training and education:<\/strong> Provide proper training on handling and use of VMA\u2122.<\/li>\n<li><strong>Admixture dosing and mixing:<\/strong> Follow recommended dosage rates and ensure thorough mixing.<\/li>\n<li><strong>Quality control and testing:<\/strong> Implement procedures to monitor concrete properties.<\/li>\n<li><strong>Equipment considerations:<\/strong> Evaluate equipment suitability and adjust settings as needed.<\/li>\n<li><strong>Collaboration with suppliers:<\/strong> Seek supplier expertise for troubleshooting and optimization.<\/li>\n<li><strong>Proper curing and protection:<\/strong> Follow recommended curing procedures and protect concrete.<\/li>\n<li><strong>Record keeping:<\/strong> Maintain detailed records of VMA\u2122 usage.<\/li>\n<li><strong>Continuous improvement:<\/strong> Learn from the experience and stay updated with industry advancements.<\/li>\n<\/ul>\n<p>[\/accordion-item]<br \/>\n[accordion-item title=&#8221;Application Instructions&#8221;]<\/p>\n<h2 style=\"text-align: left;\">Additive Consumption Amount:<\/h2>\n<p style=\"text-align: left;\">The typical dosage range for viscosity-modifying admixtures is 400 to 2000 ml per 100 kg of cement. The consumption amount of this additive is influenced by factors such as slump, ambient air, temperature, additional pozzolanic materials, mixing time, and type of cement. It is essential to avoid excessive consumption, as it can result in reduced initial efficiency and slower concreting speed. Conducting trial mixes is recommended to determine the optimal dosage for achieving the desired concrete performance.<\/p>\n<h2 style=\"text-align: left;\">Additive Mixing:<\/h2>\n<p style=\"text-align: left;\">When using viscosity-modifying admixtures, they should be added to the mixture at the end after all other ingredients have been mixed.<\/p>\n<p>[\/accordion-item]<br \/>\n[accordion-item title=&#8221;Guide to Quality Control (QC)&#8221;]<\/p>\n<ul>\n<li><strong>Familiarize with VMA\u2122:<\/strong> Understand the specific product, its properties, dosage rates, and guidelines.<\/li>\n<li><strong>Establish quality control procedures:<\/strong> Develop procedures for monitoring VMA\u2122-modified concrete throughout production.<\/li>\n<li><strong>Raw material testing:<\/strong> Regularly test and verify the quality of cement, aggregates, water, and VMA\u2122.<\/li>\n<li><strong>Dosage verification:<\/strong> Ensure accurate measurement and verification of VMA\u2122 dosage.<\/li>\n<li><strong>Concrete mix design:<\/strong> Create mix designs with appropriate VMA\u2122 proportions and conduct trial mixes.<\/li>\n<li><strong>Consistency checks:<\/strong> Regularly assess workability and flow characteristics of VMA\u2122-modified concrete.<\/li>\n<li><strong>Quality during placement:<\/strong> Monitor concrete quality during placement, addressing issues promptly.<\/li>\n<li><strong>Curing and strength development:<\/strong> Implement proper curing methods for VMA\u2122-modified concrete.<\/li>\n<li><strong>Testing and documentation:<\/strong> Conduct regular tests, document results, and maintain comprehensive records.<\/li>\n<li><strong>Evaluation and improvement:<\/strong> Continuously evaluate performance and use insights to enhance quality control processes.<\/li>\n<\/ul>\n<p>[\/accordion-item]<\/p>\n<p>[\/accordion]<br \/>\n[gap height=&#8221;50px&#8221;]<\/p>\n<p>[scroll_to link=&#8221;#documents&#8221; 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name=\"_wpcf7_ak_js\" value=\"4\"\/><script>\ndocument.getElementById( \"ak_js_1\" ).setAttribute( \"value\", ( new Date() ).getTime() );\n<\/script>\n<\/p><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n[\/col]<\/p>\n<p>[\/row]<\/p>\n<p>[\/lightbox]<\/p>\n<h2 style=\"margin-top: 5%; text-align: center;\">Frequently Asked Questions<\/h2>\n<div class=\"kk-star-ratings bottom-right rgt\">\n<div class=\"kksr-stars kksr-star gray\">\n<div class=\"kksr-fuel kksr-star yellow\" style=\"text-align: left;\">[sc_fs_multi_faq headline-0=&#8221;h2&#8243; question-0=&#8221;What is plastic liquefaction of concrete?&#8221; answer-0=&#8221;Plastic liquefaction indicates the tendency of concrete to flow and is caused by friction within the concrete mixture.&#8221; image-0=&#8221;&#8221; headline-1=&#8221;h2&#8243; question-1=&#8221;Are chlorides used in the viscosity-modifying admixtures?&#8221; answer-1=&#8221;No!&#8221; image-1=&#8221;&#8221; headline-2=&#8221;h2&#8243; question-2=&#8221;How much is the consumption viscosity-modifying admixtures?&#8221; answer-2=&#8221;It is usually used in measures of 400 to 2000 ml per 100 kg of cement. &#8221; image-2=&#8221;&#8221; headline-3=&#8221;h2&#8243; question-3=&#8221;What is the effect of excessive use of viscosity-modifying admixtures on concrete?&#8221; answer-3=&#8221;High consumption of viscosity-modifying admixtures leads to loss of initial efficiency and reduction of concreting speed.&#8221; image-3=&#8221;&#8221; headline-4=&#8221;h2&#8243; question-4=&#8221;What is the method of mixing viscosity-modifying admixtures?&#8221; answer-4=&#8221;viscosity-modifying admixtures should be added to the mixture at the end after all the ingredients have been mixed.&#8221; image-4=&#8221;&#8221; headline-5=&#8221;h2&#8243; question-5=&#8221;Do the viscosity-modifying admixtures lead to the improvement of drainage?&#8221; answer-5=&#8221;Yes, viscosity-modifying admixtures lead to the improvement of drainage.&#8221; image-5=&#8221;&#8221; headline-6=&#8221;h2&#8243; question-6=&#8221;Can viscosity-modifying admixtures be used in prestressed concrete?&#8221; answer-6=&#8221;Yes, it can be used in prestressed concrete.&#8221; image-6=&#8221;&#8221; count=&#8221;7&#8243; html=&#8221;true&#8221; css_class=&#8221;&#8221;]<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Viscosity Modifying Admixture (VMA\u2122) is a pre-mixed product used to enhance the viscosity of concrete and control its rheological properties. 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