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혼화재 치환이 초지연 콘크리트의 응결 및 공학적 특성에 미치는 영향
윤섭,김종,송용원,전충근,신동안,한천구 대한건축학회지회연합회 2005 대한건축학회지회연합회 학술발표대회논문집 Vol.1 No.1
According to the test, An increase of super-retarding-agent (SRA), which combined the SRA with admixture, delayed initial and final setting time. Interestingly control concrete incorporating only admixture also retarded setting time. In addition concrete, adding combination of the SRA and admixture simultaneously, exhibited considerable results, due to the absorbing, pozzolanic and potential hydraulicity reaction of the admixture. Overall, to secure initial setting time as control concrete does, particular coefficient value considering the properties of each materials, should be applied, before it is placed in the field construction.
혼화재료의 조합사용에 따른 매스콘크리트 모의부재의 수화열 저감공법
김종,백대현,윤섭,신동안,전충근,한천구 대한건축학회지회연합회 2005 대한건축학회지회연합회 학술발표대회논문집 Vol.1 No.1
This paper investigated the temperature history of mass concrete mock up structure considering different heat generation by varying with mixture proportion. Setting time difference between high early strength mixture (E-P) and retarding mixture (R-F30) was 14.5hours. Incorporation of 30% of fly ash contributed to 10℃ of hydration heat reduction. In generally used A and B combination, bottom concrete shows earlier hydration, while C~G combination showed reverse tendency and thus, this method can reduce the crack occurrence. For compressive strength, the mixture combination of S-F30(top section), R-F30(bottom section), which incorporate fly ash exhibits a reduction in compressive strength by as much as 5~10MPa compared with other mixture combination. There's no remarkable difference of strength development with and without fly ash based on the results of core test. Therefore, heat generation difference method has beneficial effect on reducing crack induced by hydration heat resulting from heat generation difference between surface and center section.