Abstract
Combined effect of polycarboxylate type superplasticizer and sodium sulphate on the hydration of fly ash blended Portland® cement has been studied by using different techniques. Water consistency, setting times, non-evaporable water contents, water percolation, air contents, compressive strengths and expansion in corrosive atmosphere were determined. Hydration products were examined with the help of DTA and X-ray diffraction techniques. It is found that the superplasticizer reduces the pore size and its adsorption on cement surfaces is decreased in the presence of sodium sulphate. Mechanism of hydration is discussed.
Highlights
There is a continuous decrease of natural resources on one hand and rapid increase of industrial and agricultural wastes on the other hand, which create handling, disposal and environmental problems
In this paper we have studied the effect of sodium sulphate on the hydration of fly ash composite cement in the presence of a polycarboxylate type superplasticizer with a brand name Glenium 51
The hydration reaction is exothermic in nature and as soon as cement comes in contact to water, setting and hardening processes start
Summary
There is a continuous decrease of natural resources on one hand and rapid increase of industrial and agricultural wastes on the other hand, which create handling, disposal and environmental problems. Now-a-days, fly ash and other ashes from agricultural wastes are commonly used for partial replacement of cement clinker. The composite cements are used for the development of ultrahigh performance concretes This is mainly based on the drastic reduction of the water-cement ratio with superplasticizer additions to maintain a good workability, and the improvement of aggregate size and close packing with reactive filler (pozzolana e.g. fly ash). The major disadvantage of fly ash additions is low early strengths of the concrete[3]. Various methods both mechanical and chemical have been used to activate fly ash to overcome this problem[4,5].
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