Abstract
Although the quality of fly ash is classified by JIS, the effective use of fly ash as a mineral admixture of concrete has been hindered because there is a concern that the quality of concrete with fly ash is largely fluctuated depending on the quality of fly ash. In addition, although there have been many studies on concrete with fly ash as a part of fine aggregate, the method of quality control of the concrete with fly ash has not yet been sufficiently established. In this study, an easy method to evaluate the quality of fly ash was developed, and then the influence of fly ash quality on the fresh property of concrete with fly ash was experimentally investigated. As a result, a simplified method of measuring the quantity of un-burnt carbon, the most important factor in fly ash, was proposed. The quality evaluating method of concrete with fly ash by a simplified mortar test was also proposed.
