jismart2019042: Literature Research Study on Carbonation and Drying Shrinkage Properties of Fly Ash Concrete

Abstract

In Japan, coal-fired power plants have been expanded year by year. As a result, fly ash production is increasing in Japan. In 1999, the Japanese Industrial Standard (JIS) for fly ash was revised. The fly ash grade was subdivided, and its usage was indicated in the guidelines of the Architectural Institute of Japan. However, there are still many unclear points regarding the relationship between the amount of fly ash used in concrete and carbonation and durability. Therefore, a detailed investigation was conducted on the actual condition of carbonation rate and drying shrinkage reduction performance in the carbonation test of concrete using fly ash. This study summarizes the results of individual studies, extracted and analyzed test results from previous literature published in Japan. And the effect of concrete using fly ash on neutralization and drying shrinkage was investigated. It was confirmed that carbonation rate was faster in carbonation-promotion environment test by replacing cement with fly ash. In addition, the contribution of fly ash to carbonation resistance could not be confirmed in an carbonation-promoting environment, indicating the need to study under exposure conditions. It was confirmed that the drying shrinkage strain increased with increasing W/B.