混凝土拌和物经时工作性能的补偿修复试验研究

Experimental Study on Compensation and Repair of Time-dependent Working Performance of Concrete Mixture

以不同强度等级混凝土为对象,研究一定经时条件下,不同外加剂二次补偿量对混凝土拌和物工作性能的修复规律。试验结果表明:不同强度等级混凝土经时坍损不同,低强度等级混凝土经时坍损较大,高强度等级混凝土经时坍损相对较小;对于低强度等级混凝土,较低的外加剂二次补偿量对其工作性能恢复效果不明显,而对于高强度等级混凝土,较低的外加剂二次补偿量便可使其工作性能恢复至初始状态。

Taking the concrete of different strength grades as the objects,the repairing law of the performance of concrete mixture with different secondary compensation amount of admixtures under certain time-dependent conditions.The test results show that:the slump loss of different strength grade concrete is different,the slump loss of low strength grade concrete is larger than that of high strength grade concrete;for low strength concrete,the effect of lower secondary compensation of admixture on its performance recovery is not obvious;for high strength concrete,lower secondary compensation of admixture can make its performance return to the initial state.