高性能混凝土绝热温升影响因素的试验研究

Experimental Investigation on the Adiabatic Temperature Rise of High Performance Concrete

通过混凝土绝热温升比对试验,探讨了初始温度、粉煤灰、水胶比等因素对混凝土绝热温升的影响。结果表明:混凝土拌和物的初始入模温度对早期的温升速率影响较明显,初始温度越高,温升速率越快,但对混凝土最终的绝热温升值影响很小;粉煤灰等量取代水泥可以使混凝土早期的温升速率减慢,放热峰值推迟出现,但对最终温升值影响很小;胶凝材料用量越多,其早期的温升速率越快,最终的温升值越高。

Temperature rise tests under an adiabatic condition are carried out on a series of high-performance concrete specimens. The adiabatic temperature rise curves are obtained from the specimens with different initiative temperature, different content of fly ash and different water-cement ratio. The results show that the initiative temperature has obvious influence on the temperature rising rate in the early age, but little in the later age. The higher the initiative temperature is, the faster the temperature rising rate. The addition of fly-ash can reduce the temperature rising rate in the early age, but there is no obvious effect in the later age. It is found that an increase in the content of cementitious materials will result in an increase in both the rate of the early temperature rising and the final temperature.