Abstract
In order to further promote the research and application of MgO expansion agent in concrete field, this paper carried out the effect of different humidity and temperature conditions on the expansion properties of mortar and mortar specimens mixed with MgO expansion agent. In addition, the mechanism of the factors affecting the sensitivity of the MgO expansion agent is revealed by combining microscopic technology. The results show that the higher the curing temperature and the greater the curing humidity, the greater the expansion efficiency of the MgO expansion agent. The temperature of 20~40°C has no obvious effect on the efficiency of the MgO expansion agent, but the expansion value of the specimen doubles as the temperature rises to 40~80°C. Besides, the higher the curing humidity, the better the expansion efficiency of the MgO expansion agent, but the MgO expansion agent is more sensitive to the low humidity environment, and the specimen shrinks in the lower humidity environment (RH=60%).
Highlights
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
Q WKLV SDSHU WKH IUHH H[SDQVLRQ YDOXH DQG OLPLW H[SDQVLRQ YDOXH RI FHPHQWEDVHG PDWHULDOV PL[HG ZLWK D PRGHUDWHO\ DFWLYH 0J2 H[SDQVLRQ DJHQW XQGHU GLIIHUHQW WHPSHUDWXUH DQG KXPLGLW\ FRQGLWLRQV DUH PHDVXUHG WR VWXG\ LWV H[SDQVLRQ HIILFLHQF\ 7KH LQIOXHQFH PHFKDQLVP RI WHPSHUDWXUH DQG KXPLGLW\ RQ WKH H[SDQVLRQ FKDUDFWHULVWLFV RI 0J2 H[SDQVLRQ DJHQW LV SUHOLPLQDULO\ DQDO\VHG ZKLFK FDQ SURYLGH VRPH UHIHUHQFHV IRU WKH HQJLQHHULQJ DSSOLFDWLRQ RI 0J2 H[SDQVLRQ DJHQW
Q RUGHU WR VWXG\ WKH HIIHFW RI FXULQJ WHPSHUDWXUH RQ WKH H[SDQVLRQ SHUIRUPDQFH RI WKH PRUWDU DQG PRUWDU PL[HG ZLWK 0J2 H[SDQVLRQ DJHQW WKH VSHFLPHQV ZHUH SODFHG LQ ZDWHU DW & & & DQG & UHVSHFWLYHO\ 7KH WHPSHUDWXUH ZDV FRQWUROOHG E\ WKH FKDPEHU ZLWK FRQWURO SUHFLVLRQ ZLWKLQ & 5HJDUGLQJ WKH LQIOXHQFH RI WKH KXPLGLW\ HQYLURQPHQW WKH VSHFLPHQV ZHUH SODFHG XQGHU WKH FRQGLWLRQV RI 5+ 5+ 5+ DQG 5+ DW & UHVSHFWLYHO\
Summary
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
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
