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Title |
An Experimental Study on the Construction Performances and Economical Evaluation of the Self-compacting Concrete by Cementitious Materials
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DOI |
https://doi.org/10.4334/JKCI.2017.29.3.315 |
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Keywords |
자기충전 콘크리트 ; 슬래그계 ; 벨라이트계 ; 단열온도 상승량 ; 경제성 self-compacting concrete ; slag cement type ; belite cement type ; adiabatic temperature rising ; economical evaluation |
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Abstract |
The purpose of this study is to investigate experimentally the construction performances and economical evaluation of the self-compacting concrete in actual site work after selecting the optimum mix proportions according to cementitious materials. Slag cement type of 46.5% slag powder and belite cement of 51.4% C2S content, lime stone powder as binders are selected for site experiment including water cement ratio. Also, test items for optimum mix proportion are as followings ; (1) Slump flow, 500 mm reaching time, V-type flowing time and U-box height (2) Setting time, bleeding, shortening depth and adiabatic temperature rising (3) Mixing time in plant (4) Concrete quantity and cost, quality control in actual concrete work. As test results, (4) Optimum water-cement ratio ; Slag cement type 41.0% and belite cement 51.0% (2) Setting time and bleeding finishing time of slag cement are faster, bleeding content of slag cement is higher, shortening depth and adiabatic temperature rising of belite cement type are lower (3) Optimum mixing time in batcher plant is 75 seconds and concrete productive capacity is about 100~110 m3/hr. (4) Belite cement type is lower than slag cement type in material cost 14.0%, and concrete quantity in actual concreting work save 3.3% in case of belite cement type. Therefore, self-compacting concrete of belite cement type is definitely superior to that of slag cement type in various test items without compressive strength development.
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