Implication of partial replacement of cement with fa and sand by gbs on setting time and workability of mortar

Manjunath, Sunil N and Sivapullaiah, P V and Kumar, Prasanna (2018) Implication of partial replacement of cement with fa and sand by gbs on setting time and workability of mortar. International Journal of Research in Engineering and Technology, 04 (01). pp. 47-52. ISSN 2319-1163

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Abstract

Fly Ash (FA) and Ground Blast Furnace Slag (GBS) are by-products obtained from the burning of coal in the thermal power plants and blast-furnace used to produce iron respectively. With a view to preserve natural materials like river sand and high energy consuming cement efforts are made to explore the possibility of replacing them with alternate materials including the industrial solid waste materials in the production mortar and concrete. It is in this context the setting time of FA and the workability of mortar are examined with these replacements. In the present investigation, 25% and 50% of Cement (C) is replaced by FA; and 25%, 50%, 75% and 100% of Sand (S) by GBS. Normal consistency and setting time increased with increasing replacement of cement with fly ash. However, the addition of 2% Calcium Chloride reduced the setting time of all pastes. Also, the results indicated that cement with upto 50% of FA can be considered without seriously jeopardizing the setting time. The workability test on 1:3 mortar on all combinations were performed to get a flow value of 110 + 5 as per IS 2250 -1981. To enhance the workability and consequently increase their strength 2% of super plasticizer has been incorporated. The water cement ratio increased with increase in replacement of sand by GBS. The replacement by FA upto 50% did not reduce the water cement ratio of normal cement mortar. Also, workability tests on mortar samples have shown that, GBS can be used up to 50% of sand.

Item Type: Article
Uncontrolled Keywords: Cement, FA, GBS, mortar, natural sand, replacements.
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 07 Aug 2018 09:05
Last Modified: 07 Aug 2018 09:05
URI: http://eprints.manipal.edu/id/eprint/151715

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