烘-浸交替提高混凝土性能的试验研究

针对合理的养护以提高中等强度混凝土性能的问题,以普通混凝土试件和掺入低质灰作为辅助性胶凝材料的粉煤灰混凝土试件为研究对象,室温养护28d和90d后进行烘-浸及少量冻-融试验并测量两类试件的抗压强度和弹性模量。结果表明:28 d龄期至90 d龄期间,经适宜的烘-浸交替作用,普通混凝土和粉煤灰混凝土均达到了比设计强度高一个强度等级的效果。说明高温洒水养护不仅对早期强度有利,对一定时间内混凝土强度的提升仍有很好的作用。该结果对实际工程中重视28d-90d龄期之间混凝土的养护具有一定的指导意义。

Experimental study on improving properties of concrete by dry-immerse alternation

Improving the properties of concrete by rational curing is the goal that people pursue.It is studied the properties of the ordinary Portland concrete blocks and those adding low quality fly ash as assisting cement material in concrete blocks undergone 28day-ages and 90day-ages R.T(room temperature) curing.The dry-immerse and a few freeze-thaw tests are carried out and the varying of compressive strength and elastic modulus of two kinds of concrete are achieved.The research shows that under the condition of appropriate temperature and humidity the dry-immerse alternation could improve the properties of concrete effectively during 28d-90d ages,which illustrates that sprinkling water curing after high-temperature not only benefits early strength but also improves strength in a longer period.The research result will make people pay attention to the concrete curing during 28d-90d ages in practical engineering.