Effect of Hydrochloric Acid Mixing On Strengths of Gravel Concrete and Conventional Concrete

Water is an important ingredient of concrete, which not only actively participates in the hydration of cement but also contributes to the workability of fresh concrete. Naturally available water contains many numbers of chemical impurities like chlorides, various salts and acids in different concentrations. HCl is not a common natural chemical compound, but it can cause damage to concrete in industrial environments .The effects of hydrochloric acid on concrete are multiple .If there is presence of industrial disposals containing HCl and such water is used in construction has several problems. Studies on gravel concrete and conventional concrete are performed with 0 ml, 50 ml, 100 ml per liter HCl acid solution. M20 grade gravel concrete conventional concrete are designed based on IS 10262-1982 code. The mix proportions for gravel concrete is 1: 0.5 : 1.53 : 2.92 and conventional concrete is 1 : 0.5: 1.44: 3.28. The cubes and cylindrical specimens are prepared as per mix proportions. The Compressive strength of cube specimens after 7days, 28days and 60 days curing period and split tensile strength for 28 days curing period are performed. The compressive strength values obtained for 28 days curing without HCl are 24.31N/mm2 and 35.1N/mm2 for gravel and conventional concrete respectively. The compressive strength values obtained after 28 days curing with 50 ml per liter HCl mixing in water are 19.51N/mm2 and 33N/mm2 for gravel and conventional concrete respectively. The compressive strength values obtained after 28 days curing with 100 ml per liter HCl mixing in water are 19N/mm2 and 31.3N/mm2 for gravel and conventional concrete respectively. The compressive strengths cube specimens are decreased with increasing HCl acid for a given duration and increased with increasing curing period at a given concentration of HCl.