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윤섭(Yoon Seob),송승헌(Song Seung Hean),한민철(Han Min Cheol),김경환(Kim Gyeong Hwan),정용희(Jong Young Hee),한천구(Han Chean-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study reported mock-up test on investigation of reducing shrinkage concrete. Test results show that concrete incorporating expansive additive(EA). shrinkage reducing agent(SRA) and flowing method(FM) was not affected fluidity, bleeding, setting time and compressive strength. For the properties of drying shrinkage, Number 'one' position of specimen, which is small area, exhibited high drying shrinkage, while specimen 'D' incorporating EA, SRA, and FM at the same time, presented favorable effect, which reduce 30 to 40% of drying shrinkage, compared with plain concrete.
주은희(Joo Eun-Hi),손명수(Shon Myeong-Soo),차천수(Cha Cheon-Soo),김성수(Kim Seong-Soo),한천구(Han Chean-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This experimental study investigates compressive strength and neutralization of concrete incorporating mineral admixture, including CKD. FA and BS. For the properties of compressive strength, at 3 days, compressive strength of concrete incorporating cement kiln dust(CKD) was comparable to that of plain concrete, due to acceleration of early hydration of CaCO₃. On the other hand, at age of 91 days, concrete incorporating FA and BS exhibited higher strength gain than that of concrete incorporating CKD, due to pozzolanic and potential hydraulicity reaction. Increase of W/B ratio caused high neutralization depth. These of mineral admixture resulted in an increase in neutralization depth. This result can be illustrated by the fact that the incorporation of CKD resulted in an decrease in the cement contents, while alkali portion decreases due to pozzolanic reaction of FA and reduction of both Ca(OH)₂and BS. Variation in physical properties of concrete is probably independent of the type of admixture used in this paper. The type of admixture did not affect any physical properties of concrete. However neutralization depth increased with an increase of M.A. contents.