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 ...
Concrete Admixtures
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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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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 ...
Blended Cement – Characteristics, Types and Uses
Blended cement can be defined as uniform mix of ordinary Portland cement (OPC) and blending materials such as silica fumes, fly ash, limestone and slag to enhance its properties for different uses. Blended cement can improve workability, strength, durability and ...
Role of Gypsum in Cement and its Effects
Gypsum is a mineral and is hydrated calcium sulphate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement, so its is generally termed as retarding agent of cement. It is mainly used ...
15 Types of Admixtures Used in Concrete
Admixtures are defined as the material other than the aggregate, water and cement added to the concrete. The use of suitable admixture can result in the enhancement the performance of concrete.
Sulphate Resistant Cement – Composition, Properties, Uses and Advantages.
Sulphate Resisting Cement is a type of Portland Cement in which the amount of tricalcium aluminate (C3A) is restricted to lower than 5% and (2C 3A +C4AF) lower than 25%, which reduces the formation of sulphate salts. The reduction of sulphate ...
Quick Setting Cement- Phenomenon and Uses.
It is one of the type of cements where the initially set in 5 mins and final set is achieved in 30 mins, which is used in the special conditions of construction like in running water. In this article we ...