RESEARCH OF HIGH FLY ASH CONTENT IN CONCRETE WITH DIPY CONSTRUCTION FORMWORK

摘要

This paper reports the research and application of high fly ash content concrete (HFCC) with Dipy construction formwork. Concrete construction using Dipy construction formwork can skip the processes of form stripping and concrete vibration. According to the research of the working principle of concrete with Dipy construction formwork, it can be found that cement paste composed of high fly ash content exudes out from the inner of the concrete wall. This process can reduce the air bubbles and then improve the compactibility of concrete. To improve the strength, durability, and carbonation resistance of the high fly ash content concrete, the DG-II fly ash activating agent has been developed and researched. The test specimens are cored from nine concrete walls, which are different in mixing proportions. The research program consists of comparing the compactibility, compressive strength, and durability of concrete cores. Research program results show that, with the effect of DG-II fly ash activating agent, while the replacement of fly ash increase up to 50%, the strength of HFCC with Dipy construction formwork is at the same level as that of ordinary concrete. DG-II fly ash activated agent can improve the durability of HFCC with Dipy construction formwork to some extent.