고로슬래그 치환율에 따른 콘크리트의 물리적 특성과 적용성

Abstract

This study presented to determine the effective usage of slag in concrete as cement binder. In order to determine the effective slag replacement ratio of cement matrix, the mixture proportions of SeriesⅠin accordance with unit weight of slag and water were designed and its mechanical properties regarding slump, air content, bleeding and compressive strength were tested. From the test results of SeriesⅠmixture, the Series Ⅱ mixtures which were adjusted the unit weight of water were modified and the slump, air content, setting time and heat of hydration were tested. The effective slag substitutional ratio with 50% of the binder was selected in present study. To evaluate application of the slag mixture in construction site, the mock-up test including compressive strength and heat of hydration for OPC mixture and conventional low heat cement mixtures was performed. From the mock-up test it was found that the compressive strength of slag concrete was advantageous to the long-age strength of concrete depend on the latent hydraulic reactivity of cement incorporating slag. Moreover, the mixture incorporating slag was not only able to effectively decrease the maximum heat of hydration and hydration velocity of concrete compared with OPC mixture but it also presented similar low heat tendency of conventional low heat cement concrete. The mixture proportion of high volume slag concrete in this study is sufficiently adopted to the concrete structures requiring controlled heat distortion cracks and long-age strength.