There are many factors that influence the performance of admixtures in concrete such as type of admixture, dosage, compatibility of the admixture with cement, mix design, ambient temperature, and the presence of other admixtures. These factors influence the degree of ...
Category: Concrete Admixtures
Admixtures are used to modify properties of concrete in fresh and hardened state. Articles on concrete admixtures are presented.
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Applications of Rice Husk Ash in Building Constructions
Rice husk ash (RHA) plays two roles in concrete constructions. The first role is using rice husk as a substitute for Portland cement which leads to the reduction of the cost of concrete, and the other role is as an ...
High Range Water Reducing Admixture for Concrete
High range water reducing admixture reduces the quantity of mixing water required to produce concrete of a given consistency by 12 % or greater, as per ASTM C 494- C 494M. It is capable of producing great water reduction, great ...
Microsilica in Concrete – Types, Properties, and Practical Applications
Microsilica in concrete improves its strength and durability as it provides more uniform distribution and a greater volume of hydration products, and decreases the average size of pores in the cement paste. Microsilica, also known as silica fume or condensed ...
Polymer Modified Mortar – Types, Properties, and Applications
Polymer modified mortar is produced by mixing water with polymeric admixtures, Portland cement, and sand. The addition of polymer improves mortar’s performance and consequently can be utilized advantageously and economically in several applications. Latex polymers, redispersible dry polymers, water-soluble polymers ...
Viscosity Modifying Admixtures (VMAs) in Concrete
Viscosity Modifying admixtures or VMAs are the admixtures used to change the properties such as viscosity, workability, cohesiveness etc. of fresh concrete. Function of VMA and Applications in different types of concretes are discussed below. Function of Viscosity Modifying Admixture ...
Role of Calcium Chloride in Concrete
Calcium chlorides is used as accelerator in hydration process of cement, leading to quick set of concrete and to get high initial strength concrete. Maximum permissible limit of addition of calcium chloride is 2% in flake form. Methods of Adding ...
Retarders for Concrete – Mechanism, Types and Effects on Properties
Retarders for concrete are used to delay the initial setting time of the concrete upto an hour. They are generally used in the hot weather condition to counter the rapid hardening due to high temperature, thus allowing the time for ...