Effect of simulated acid rain on deterioration of concrete

In the study the long-term exposure tests to simulated acid rain were perfo rmed in order to clarify the effect of acid rain on deterioration of concre te. Mortar specimens with 40 mm in width, 15 mm in thickness and 160 nun in length were used for the tests. At each time after the fixed rainfall was attained, those were tested physically and analyzed chemically. Finally tot al rainfall of 9000mm was given to the specimens. From the test results, it was confirmed that the eroded depth of the specimen has a good linear rela tion to the total rainfall under simulated acid rain with various pH. Surfa ce erosion rates of the mortar specimens with an ordinary mix proportion un der simulated acid rains with pH 3.0 and 2.5 were about 1.2 and three times larger than that under pH 5.6, respectively. It was also confirmed that fl exural strength of the specimens with an ordinary mix proportion hardly cha nged under low pH simulated acid rain even after total rainfall of 9000mm w as given.