Study of the Effect of Water Retarding Concrete Admixtures on the Properties of Concrete

Abstract

Water retarding concrete admixtures and super plasticizer are extensively utilized to recover the structural and mechanical properties of fresh and hardened concrete. These admixtures are more regularly used in pre-stressed concrete, slim components with overfilled and densely filled reinforcement, beams and slabs pre-cast basics and long slender column. In current decades, marvelous success has been attained in the progression of chemical admixtures for Portland cement. Most efforts have concentrated on improving the properties of concrete and studying the factors that influence on these properties. Meanwhile, the compressive strength is careful an appreciated property and is habitually a vigorous element of the structural design, especially high early strength development which can be provide more benefits in concrete production, such as reducing construction time and labor and saving the formwork and energy. In the present research, two types of water reducing agents of Polymer and Modified Lignosulphonate base conforming to ASTM C-494 type C and ASTM C 494-81 type A respectively have been used. The effect of the addition of admixtures on the workability, water reduction, compressive strength, tensile strength and modulus of rapture has been mostly experimental in the study. The results have shown considerable development in the properties of concrete after use of the admixtures. The polymer based high range water reducer, superplasticizer has given more promising results as compared to the customized lignosulphonate base water reducers.