关键词: 自密实混凝土, 胶凝材料, 流变性能, 绝热温升

Abstract:

Self-compacting concrete with a cementitious material content varying from 460 to 550 kg /m³ was prepared,and the workability of the concrete was tested via the normal method. Then,the air void parameters of the self-compacting concrete mixture and the rheological parameters of the mortar with gravels being filtered out were tested by using an air void analyzer and a rotary rheometer,and the temperature-rising process of the concrete was analyzed by using an adiabatic temperature-rising analyzer. The results show that the self-compacting concrete is of better flowability,passing ability,segregation resistance as well as better pore structure when the cementitious material content varies from 480 to 500 kg /m³ ,while it is of poor pore structure when the content reaches 550 kg /m³ ;and that,with the increase of the cementitious material content,both the plastic viscosity and the yield stress of the concrete increase,the stability of thixotropic structure degrades,and the maximum adiabatic temperature rising as well as the peak of temperature rising rate increases.

Key words: self-compacting concrete, cementitious material, rheological behavior, adiabatic temperature rising