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시멘트 분말도 변화가 빈배합 모르타르의 품질에 미치는 영향
이재진 ( Lee Jae-jin ),문병룡 ( Moon Byeong-ryong ),김영태 ( Kim Yeong-tae ),장덕배 ( Jang Deok-bae ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2
The fineness degree of Ordinary Portland Cement (OPC henceforth) usually used in Korea`s construction sites, is designated as over 2,800cm2/g. But the higher the fineness, the surface area of hydration reaction on water increases as well, resulting in large early age strength and high-intensity; so the trend is to prefer a high degree of fineness. But from a pore-space filling perspective, fine-particled cement is not always beneficial to intensity. Therefore in this study artificial modifications were given to cement fineness to analyze the effect of various fineness changes on the liquidity, air quantity and intensity of lean mixture cement mortar. As a result, the greater the degree of fineness, the better the cement was, with fine particle+OPC having the most satisfactory results due to consecutive particle distribution.
BS 치환 모르타르의 ERCO 도포시 수분증발 및 수축변화에 미치는 영향
백철 ( Baek Cheol ),이제현 ( Lee Jae-hyeon ),황찬우 ( Hwang Chan-woo ),장덕배 ( Jang Deok-bae ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2
This study applied BS replacement mortar`s ERCO to see what impact it has on moisture evaporation and contraction changes, and resulted in the following. Depending on the rate of change in length according to the cure method of BS replacement mortar, high-strength areas were shown to have a bigger increase in the rate of change in length than regular or low-strength areas, and differences in rate of change in length due to ERCO cure methods were shown to be slight. For rate of changes in mass, on the whole there was an increase in the order of dry curing, cover curing, 7-day water curing, and28-day water curing. A comprehensive view says that after removal of test piece specimens, ERCO application did not expect a sufficient curing effect in the BS area.