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액상형 조강제를 사용한 콘크리트의 P형 슈미트햄머에 의한 압축강도 추정
송용원(Song Yong-Won),노상균(Noh Sang-Kyun),이건철(Lee Gun-Cheol),이세현(Lee Sea-Hyun),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This study is to save the time of construction that the early estimation for the compressive strength would be carry out based on the measurement of the concrete using the liquid type high early strength agent by Pr type schmidt rebound hammer. For the experimental factors, the plain mixture contains the standard type AE water reducing agent, and the types of the agents are the standard type AE water reducing agent(P), liquid type high early strength agent(AD), poly carboxylate high early strength type AE water reducing agent(E1), and naphthalene + melamine high early strength type AE water reducing agent(E2). As the Contents of the agents, E1 and E2 is two types each cases. P is one type to satisfy the target fluidity and air content, and AD is three types as 0.5, 1.0,and 1.5%. Accordingly, the correlation coefficient is 0.847, so it is analyzed that the quality control and estimating compressive strength by P-type schmidt rebound hammer can be possible.
폴리프로필렌 섬유의 혼입률 및 형상비 변화에 따른 고강도 콘크리트의 폭렬특성
송용원 ( Song Yong-won ),백대현 ( Baek Dae-hyun ),손성운 ( Son Sung-woon ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
This study investigates spalling resistance of high strength concrete, 60 ~80MPa class, designed with the various adding and aspect ratios of polypropylene(PP) fiber. Test showed that increase of PP fiber content and aspect ratio decreased the fluidity of fresh concrete. Especially, the slump flow significantly decreased in the specimens containing certain fibers being 475 and 750 of aspect ratios. Compressive strength values of specimens containing fibers, 300 and 475, exhibited 5 percent higher than other specimens. In addition, specimens containing more than 0,1 vol% of PP fiber, 300, had favorable spalling resistance. Therefore the specimen, containing 0.1 vol% of PP fiber, 300, exhibited the most effective fluidity, strength as well as the side of economy.