By: Anagha Kulkarni
Construction chemicals are additives that are used with concrete, cement, and other construction materials to provide additional durability and workability to various structures. The type of chemical to be used depends on the size and nature of the project. Construction chemicals are used to obtain certain desired characteristics in concrete such as high workability, high compressive strength, and high performance and durability parameters to meet the requirement of complexity of modern structures. Hardeners are used with structures to seal them against moisture and making them dustproof by bonding the crystalline structure of cement.
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Admixtures can modify properties such as workability, water reduction, heat of hydration, dispersion and air-entrainment, accelerating or retarding setting time, impermeability and durability factors. Commonly used admixtures are hydro carbolic acid salts and ligno-sulfonates. Construction chemicals provide structures with enhanced bond strength and moisture retention, increased crack resistance of mortar, increased yield with same quantity of construction materials, decreases drying time of mortar and improves appearance.
Admixtures can be further classified as chemical admixtures and mineral admixtures. Chemical admixtures include plasticizers, accelerators, and set retarders, which are used for water reduction and decreasing hardening time of concrete or cement. Mineral admixtures consist of fly ash, silica fume, blast furnace slag, and rice husk that are used to enhance the properties of cement. Waterproofing is a cement coating which when applied to permeable masonry surfaces forms a heavy-duty and durable finish which water resistant and increases the toughness of the surface. Construction chemicals are also used for repairing concrete structures and are suitable for structural and non-structural repairs. Flooring chemicals provide high bond strength and can be used with mosaic tiles, glazed tiles, granite tiles, terrazzo tiles, brick, and marble.
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