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고주파 가열건조법에 의한 굳지않은 콘크리트의 단위수량 추정에 관한 연구
한천구(Han Cheon-Goo),전충근(Jeon Chung-Keun),김광서(Kim Kwang-Seo),김영득(Kim Young-Deuk) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.1
This paper is intended to investigate the influence of mixing and aggregate factors on the estimation of unit water content of concrete by heat drying method using micro wave. According to the results, as for mixing factors, estimated unit water content is a little smaller than mixture unit water content below 200kg/㎥, but larger than mixture unit water content above 200kg/㎥. As the replacing ratio of mineral admixture increases, the difference between estimated and mixture unit water content becomes small. As the amount of AE agent increases, estimated unit water content is smaller than mixture unit water content, so precaution for that should be taken. Estimated unit water content with the kinds of aggregate is larger in order of basalt, lime stone and granite aggregate. Also in the case of recycled aggregate, unit water content is estimated favorably in the range of ±5 kg/㎥ in comparison with mixture unit water content, and it is found that if material segregation by fine aggregate ratio occurs, a error for estimation increases. Since estimated unit water content is smaller by 3kg/㎥ than mixture unit water content due to a defect of absolute drying, correction for that is needed on the whole. Therefore, in order to apply heat drying method using high frequency micro wave in construction field, if absorption ratio of aggregate is measured exactly, water content is corrected by calculating aggregate amount in sample exactly and, if correction of 3kg/㎥ is considered, it is possible to estimate unit water content favorably.