The Effect of Rainwater in Concrete Mixture on Concrete Compressive Strength

Rainwater was acidic water and had a pH generally ranging from 5.2 to 6.5. In this research using quantitative types, where the data obtained by conducting in laboratory. The sample used cylindrical concrete with size of 15 x 30 cm total specimens that will be tested for compressive strength Machine Compression testing machine determine concrete. results study were rainwater 5.8 normal PDAM 7.0 as comparison. showed at age 3 days 6,638 MPa, 7 11,878 14 17,567 Mpa, 21 19,840 MPa 28 21,490 MPa. While are 9,107 13,830 16,425, 16,470 17,982 From above, it can concluded use mixtures curing decreased 16,32% water. Which indicates better mixing compared 5.8.