水工混凝土抗冻性能影响因素研究

Research on effect factors of hydraulic concrete anti-frozen capability

影响水工混凝土抗冻性能的因素较多,主要包括含气量、水胶比、骨料粒径及种类、掺和料及人工砂石粉含量等。本文按照《水工混凝土试验规程》对影响混凝土抗冻耐久性的各种因素做了系统的试验研究,试验结果表明:含气量对混凝土抗冻性影响最为显著,其次骨料种类及粒径、水胶比等都不同程度地影响着混凝土的抗冻性能,粉煤灰对混凝土抗冻性影响较为复杂,而人工砂石粉的含量则主要影响混凝土引气剂的掺量,在含气量相同时石粉含量对硬化混凝土抗冻耐久性没有显著的影响。

There are lots of factors that affect the performance of hydraulic concrete anti-frozen capability,including gas volume,water-cement ratio,aggregate type and size,powder blending material and artificial aggregate contents.According to Test Code for Hydraulic Concrete,this paper makes systematic experimental study for all the factors affecting the performance of hydraulic concrete anti-frozen capability.The result shows the air volume affects the most,and then followed by aggregate type and size and water-cement ratio that affect in some degrees.The effect of coal ash is more complicated.The contents of artificial aggregate mainly affect the quantity of concrete air-entraining agent,but it has no significant effect where the air volumes are the same.