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Experimental Study on Drying Shrinkage Behavior of Cement Mortar with Replacement of Fine Aggregate with GBFS

Author(s):

Vangapandu Chaitanya , Chaitanya College of Engineering; G. Roop Manohar, Chaitanya College of Engineering

Keywords:

Granulated Blast Furnace Slag, Shrinkage

Abstract

Sand is a prime material used for preparation of mortar and concrete plays a major role in mix design. The construction industry demands only specific type of sand, for making mortar and concrete. This has led to a huge demand and degradation of natural sources. Shortage river sand has greater impact on construction industry. Hence there is a need alternative material to river sand such as GGBS, copper slag, quarry dust, foundry sand may be alternative for river sand. Ground granulated blast furnace slags are one of the promising sustainable solid wastes generated by industry. In order to address the scarcity of sand GBFS can be used as an alternative material. Present experimental work explores the possibility of using GBFS as replacement of natural sand in cement mortar. The main objective of the present work is to study drying shrinkage of mortar of ratios 1:3 and 1:4 by replacing the fine aggregate with GBFS at 0%, 25%, 50%, 75%, and 100% with w/c ratios of 0.45&0.56 respectively. A total no of 30 specimens of size hardly25 % is being used mostly in cement production. Hence, using GGBFS in place of sand may reduce the environment affects and also may give solution to scarcity of sand. The feasibility of the usage of ground granulated blast furnace slag (GGBFS) as percentage substitutes for fine aggregate in cement mortar is proposed in this study. Drying shrinkage is defined as the contracting of a hardened concrete mixture due to the loss of capillary water. This shrinkage causes an increase in tensile stress, which may lead to cracking, internal warping, and external deflection, before the concrete is subjected to any kind of loading. Evaporation of gel water changes the surface energy of the solid phase and causes further shrinkage. However, if the environment is wet or moist, the flow of moist will be spread from the environment to the specimen, the result being a volume increase or swelling. All Portland cement concrete undergoes drying shrinkage or hydral volume change as the concrete ages. (25x25x25) mm are tested for drying shrinkage using The hydral volume change in concrete is very important length comparator after 28 days of curing period. The optimum percentage replacement of sand with GGBS for 1:3 and 1:4 mix proportions were determined. Drying shrinkage of specimens with 1:3 and 1:4 ratios increased up to 75% replacement of fine aggregate with GBFS. Ground blast furnace slag is recommended to use as an alternative material to natural sand.

Other Details

Paper ID: IJSRDV5I120533
Published in: Volume : 5, Issue : 12
Publication Date: 01/03/2018
Page(s): 872-876

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