EFFECT OF PORE STRUCTURE AND EVAPORABLE-WATER ON STRENGTH AND DEFORMABILITY OF ULTRA-HIGH-STRENGTH PASTE

Abstract

In this study, paste with a strength of over 200 MPa made using low-heat portland cement and silica fume was subjected to thermal histories with different maximum temperatures to confirm the development properties of strength, autogenous shrinkage, and pore structure. By clarifying changes in the pore structure under different thermal histories, the authors considered the effect of pore structure and evaporable-water on the strength and deformability. Furthermore, the function of micro-pores inaccessible to nitrogen or helium molecules and “unbound water” present in such micro-pores was considered.