Basic Research for Improving the Initial Strength of LPC-FA Concrete with C-S-H Accelerating Admixture

In concrete engineering in Japan, the rapid deterioration of structures in recent years and the increase in carbon dioxide emissions during cement manufacturing have become problems. In order to solve this problem of aging, it is necessary to use materials with excellent long-term durability. In addition, the amount of cement used needs to be reviewed to solve environmental problems. As a countermeasure for these, research is underway on concrete using low-heat Portland cement and fly ash. However, this concrete is difficult to consume due to its low initial strength, and it is rarely used in Japan. In this study, to improve this low initial strength, we examined the mix proportion of concrete to which an accelerating admixture is added. Also, to compare the prepared concrete with the conventional one, a test was conducted to see the compressive strength. There are four types of test performed. As a result, the concrete we have planned has shown the best results in all tests. In this study, it was found that adding an accelerating admixture to low-heat Portland cement is effective. The use of concrete in this research for future Japanese structures will lead to the solution of environmental and social problems.