Examination of the Alkali Silica Reaction on Existing Roads with Use of Cements with Different Alkali Equivalent

Abstract

In the paper two existing roads in Austria were examined on the focus of alkali silica reaction of concrete. The two roads have different ages. One is more than 50 years old one is round about 20 years old. The exposition was ordinary highway and countryside highway in the mountains. As next the examination takes the stones from the origin and uses different types of cement to examine the background of the alkali silica guidelines for performance tests of alkali silica reaction. The results are very interesting because most of the performance tests are use test cements with ordinary alkali equivalent. Often the used stones not meet the maximum value of loss of mass under the condition of alkali-load. By using alkali reduced cement the results are less than the maximum value of loss of mass under the condition of alkali-load. One of the targets of the examination was the determination of good load conditions for examination of the alkali silica reaction of stones for use in concrete for road structures. The final paper shows all the examinations and the results between the compared cements and the compared test procedures.