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セメントペースト供試体の電気伝導率を測定し反射電子像の画像解析により明らかにされた粗大な毛細管空隙の空間構造の特徴との対応性を調べた粗大な毛細管空隙構造は系全体の空隙量およびその連結性を反映しその空間統計学に基づく特徴量は電気伝導機構と関係づけられるまた鉱物質混和材の種類によって電気伝導率の低下の傾向が異なり粗大毛細管空隙の空間構造と物質透過性の相関性が低下するこれは微細な毛細管空隙の連結性が混和材混入により低下するためと考えられる Electrical conductivities of hardened cement pastes with and without mineral admixtures were investigated in relation to characteristics of coarse capillary pore spatial structure, which was revealed by SEMBSE image analysis technique. The pore structure was quantitatively evaluated by some parameters derived from the spatial statistical functions. There exists a good correlation between the coarse capillary pore structures and the electrical conductivity. The coarse capillary porosity and its spatial correlation distances do not contradict the total capillary porosity and pore connectedness which is induced from the FKG inequality. It is suggested that connectedness of invisible fine pores is also an increasing function of the fine porosity. In spite of the incorporation of mineral admixtures, the electrical conductivity of the pastes with the admixtures could be expressed with the same liner regression lines as the plain cement pastes without the admixtures. Furthermore, the incorporation of fly ash and silica fume did not decrease the continuity of coarse capillary pores. Nevertheless, the electrical conductivity decreased in the cement pastes with those admixtures. This fact suggests that more disconnected networks of fine capillary pores were generated in the cement pastes containing the mineral admixtures even if the total porosity was the same as the plain system without them

RELATIONSHIP BETWEEN CAPILLARY PORE SPATIAL STRUCTURE AND ELECTRICAL CONDUCTIVITY IN CEMENT PASTES