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为探究防冻剂对混凝土引气剂气泡稳定性能的影响,考虑4种防冻剂及不同掺量等敏感性因素进行水泥稀浆摇泡实验,分析其对引气剂起泡与稳泡能力影响及作用机理。结果表明,建立摇泡实验的气泡体积衰减指数模型,其参数能表征不同引气剂起泡与稳泡能力;硝酸钙对皂苷类引气剂稳泡能力有正作用,防冻剂对其起泡能力均有负作用;乙二醇对苯磺酸盐类引气剂起泡能力有正作用,对其稳泡能力有正作用,表现为亚硝酸钙>硝酸钙>乙二醇;4种防冻剂对掺皂苷类引气剂的新拌混凝土含气量均有负影响,其显著性为乙二醇最强,亚硝酸钙最弱,钙盐类防冻剂对掺苯磺酸盐类引气剂均有负作用,乙二醇对其有正作用。
In order to investigate the effect of antifreeze on the air bubble stability of concrete air entraining agent, four kinds of antifreeze and different sensitivity factors were used to carry out the experiment of defoaming cement slurry, Mechanism of action. The results show that bubble volume decay index model of bubble-blowing experiment is established, and its parameters can characterize the foaming and foam-stabilizing ability of different air-entraining agents. Calcium nitrate has a positive effect on the foam-stabilizing ability of saponin-based air-entraining agent. Glycol have a positive effect on the foaming ability of the benzene sulfonate air-entraining agent and have a positive effect on the foam stabilizing ability, which is represented by calcium nitrite> calcium nitrate> ethylene glycol; and four types of antifreeze Agent on the gas content of fresh concrete admixed with saponin-type air-entraining agent have a negative impact, the significance of the strongest ethylene glycol, calcium nitrite is the weakest, calcium salts of antifreeze on benzene sulfonate air entraining agent Have a negative effect, ethylene glycol has a positive effect on it.