INVESTIGATION OF DRYING SHRINKAGE AND COMPRESSIVE STRENGTH OF CEMENT MORTAR WITH PARTIAL REPLACEMENT OF CEMENT BY EGG SHELL POWDER AND MILLED GLASS

Abstract

ABSTRACTOne of environmental pollution and global warming sources is cement industrials. In line todiminish the effects of cement industrial activities on environment, wastes are used in cementmortar as a partial replacement of cement weight throughout the present study. These wastescomprise poultry egg shell which is wealthy in calcium and glass of bottles of juices and soft drinkwhich has high content of silica. Both types of wastes were grinded carefully and passed sieve No.200 ( 75μm opening size) to produce egg shell powder (ESP) and milled glass (MG). Cement wassubstituted by (5%, 7.5%, and 10% ESP), and (10% MG). These ratios of replacement wasevaluated individually and in groups by compressive strength test at age of 28 days and dryingshrinkage test at ages of 4, 11, 18, 25, and 60 days of drying. Results of tests indicated thatcompressive strength and drying shrinkage have the same trend when the replacement ratios of ESPused individually in mortar mixes. The higher results were recorded with ratios of 5% and 7.5%.While, compressive strength increased when 10% of MG was used as a partial replacement ofcement, and drying shrinkage decreased at ages 11, 18, and 25 days of drying. The combination ofMG and ESP in one mix, decrease compressive strength in all percent of addition. However thegathering of MG to 5% of ESP, and MG to 7.5% of ESP decrease drying shrinkage at all age oftesting when compared it with the reference mix.