初期に高温履歴を受ける低熱ポルトランドセメント・高強度用結合材を用いた高強度結合材ペーストの強度発現性状と微細構造

概要

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Concrete in structures subject to high temperature history at early ages develops high strength early, but generally the strength becomes lower than that of standard cured concrete specimens at long-term ages. This phenomenon is believed to occur because microstructural development of the binder paste in concrete is changed due to the high temperature history at early ages. In this paper the strength and microstructural development of binder pastes using low heat portlandcement and high strength binder under different curing conditions are investigated. The standard cured binder paste specimen has a pore structure with a greater number of pores of large diameter compared to the binder paste subject to high temperature history with same total pore volume. Therefore, after the total pore volumes of the both binder paste specimens are equal, the hydration speed and densification of the standard cured specimen becomes faster than that of the specimen subject to high temperature history. It is thought that this tendency explains the difference of strength development between concrete in structures subject to the high temperature history and standard cured concrete specimens.
社団法人日本建築学会の論文
2003-06-30