关键词: 水泥;细度;水化特性;砂浆;自愈合

Abstract: The hydration heat, hydration products and mechanical properties of cement with different fineness were studied, Effect of cement fineness and curing condition on strength restoration ratio and the change of crack width of cement mortar cracks was analyzed.The results show that with the increase of cement specific surface area, the peak value of hydration heat of cement is higher, and the degree of hydration is higher at the same age.The strength restoration ratio of pre-cracked specimens in natural curing, standard curing and water conservation showed a similar regularity decreasing with the increase of the fineness.With specific surface area of 254 m2/kg and 407 m2/kg of cement mortar block precast cracks, the initial maximum width of the crack is 0.070 mm, After curing in water for 90 d, the former cracks were healed.However, the latter fracture healing rate was 57.1%.

Key words: cement;fineness;hydration characteristic;mortar;self-healing