CAJ | 학술논문

为阐明不同成型压力下粉煤灰微珠活性粉末混凝土抗压强度的变化规律，分别研究了不同成型压力、起始施压时间及不同养护方式等对活性粉末混凝土抗压强度的影响，并采用压汞、SEM研究了产物的孔隙率和微观结构。结果表明：在RPC成型过程中施加微小压力能显著提高RPC凝胶产物密实度和基体-骨料界面黏结程度，进而大幅提高其抗压强度。起始施压时间宜为RPC初凝前1~2 h，过早或过晚施压均不利于RPC抗压强度的发展。高温养护可大幅提高RPC的抗压强度，但会削弱成型压力对RPC抗压强度的增强效果。
위천명불동성형압력하분매회미주활성분말혼응토항압강도적변화규률，분별연구료불동성형압력、기시시압시간급불동양호방식등대활성분말혼응토항압강도적영향，병채용압홍、SEM연구료산물적공극솔화미관결구。결과표명：재RPC성형과정중시가미소압력능현저제고RPC응효산물밀실도화기체-골료계면점결정도，진이대폭제고기항압강도。기시시압시간의위RPC초응전1~2 h，과조혹과만시압균불리우RPC항압강도적발전。고온양호가대폭제고RPC적항압강도，단회삭약성형압력대RPC항압강도적증강효과。
For exploring the variation of compressive strength of RPC in various molding pressures,effect of molding pressure,initial pressing time and curing conditions on compressive strength of RPC were studied.The porosity and microstructure of products were mea-sured by MIP and SEM.Results showed that,the density of gel binder and interface adhesion between binder and aggregates were signifi-cantly improved by extremely litter molding pressure,thus improving the compressive strength of RPC.It's appropriate for the improvement of compressive strength that the initial pressing time should be 1-2 hours before initial setting time.High temperature curing condition could significantly increase the compressive strength of RPC,but it would be weaken the enhancement effect by molding pressure on com-pressive strength of RPC.