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- W2181332023 abstract "Concrete is a composite material obtained by mixing cement mixture, aggregates and water. Besides these basic components, concrete contains additions and/or additives. The concrete performances, depend on the quality of component materials, their proportions, the place and the exposure conditions. The quality of raw materials used in clinker manufacture, conditions of calcination, fineness and particle size of cement, the relative proportions of cement and the water amount, all influence the physicochemical behavior of cement grout. Furthermore, the type of cement, aggregates nature, water, mixing temperature, additives and the environment will determine the physical, chemical behavior and durability of concrete [1]. The superplasticizers added in small amounts, affect many properties of concrete, from the time the water comes into contact with dry ingredients of concrete to long-term behavior. Superplasticizers advantages are high water reduction (up to 40%), increased mechanical strength, increased impermeability and increased durability. In order to obtain high strength fluid concrete, new types of superplasticizer have been discovered and developed. Concrete with superplasticizer has a low w/c ratio, is used in combination with silica fume to obtain concrete strength above 100 MPa, improves the surface appearance, can be placed in difficult areas, and it does not vibrate. The high water reducing additives/superplasticizer are synthetic water-soluble organic substances that significantly reduce (up to 40%) the amount of water needed to achieve a certain consistency of concrete (of higher compression, very workable) [2]. This effect can be used in two ways: 1) to reduce the water content so as to increase the strength and reduce the permeability (increased durability); 2) as cement dispersant of the same water content to increase consistency and workability. To obtain high-performance concretes water reducing additives (especially superplasticizers) are used. They may be of the type shown in table 1." @default.
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- W2181332023 date "2012-01-01" @default.
- W2181332023 modified "2023-09-23" @default.
- W2181332023 title "Superplasticizer Polymeric Additives Used in Concrete" @default.
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