全级配预冷混凝土生产方法研究

Production method of full-graded precooled concrete

为解决全级配预冷混凝土生产中预冷砂的问题,定量分析了砂温与混凝土出机口温度、片冰用量的关系,以及生产7℃,9℃,11℃全级配预冷混凝土的砂温适用范围;提出了用冷水与砂混合,再经二次机械振动脱水的冷砂方法,并进行了关键工艺试验。结果表明:该方法可有效降低砂温且保证砂含水率稳定,实现全级配预冷混凝土生产。

To solve the problem of sand precooling in the production of full-graded precooling concrete,we quanti⁃tatively analyzed the relationship between sand temperature and concrete temperature out of mixers,flake ice amount,as well as the suitable sand temperature range for the production of 7℃,9℃,11℃full-graded precooling concrete.We proposed a cooling sand method that mixing the sand with cold water then secondary dehydrating by mechanical vibration,and carried out the key technological tests.The results showed that the method can reduce the sand temperature and ensure stable moisture content,so realize production of full-graded precooling concrete.