自密实轻骨料混凝土工作性能和力学性能试验研究

Experimental Research on the Work Performance and Mechanical Properties of Self-compacting Lightweight Aggregate Concrete

自密实轻骨料混凝土是在自密实混凝土的基础上,用轻骨料代替普通骨料,采用一定混凝土配合比技术配制而成的一种新型高性能混凝土。本试验通过掺加不同量的粉煤灰制备自密实轻骨料混凝土,系统研究了胶凝材料用量及粉煤灰掺量对其工作性能和力学性能的影响。研究结果表明,混凝土坍落度为260mm时,坍落扩展度为650mm,此时的自密实轻骨料混凝土的工作性最好;当粉煤灰掺量为15%时,自密实轻骨料混凝土的后期强度达到最高,相比早期强度增大幅度达183%。

Self-compacting lightweight aggregate concrete is based on self-compacting concrete,using lightweight aggregate instead of ordinary aggregate,and adopts a certain mix proportion of concrete to prepare a new kind of high performance concrete. By adding different amount of fly ash to prepare self-compacting lightweight aggregate concrete,it studies the impact of the dosage of gelled material and fly ash on its work performance and mechanical properties. The research results show that when the slump of concrete is 260 mm and the slump flow is 650 mm,the self-compacting lightweight aggregate concrete ＇s work performance be the best; and when the dosage of fly ash is 15%,the later strength of self-compacting lightweight aggregate concrete reaches the highest intensity,compared with the early strength,the increasing extent up to 183%.