消泡剂和引气剂复掺对混凝土气泡参数及外观形貌的影响

摘要

采用混凝土含气量仪与气泡参数分析系统，研究了不同比例消泡剂和引气剂复掺对混凝土气泡参数的影响，结合气泡参数与混凝土外观形貌的关系，提出了优化混凝土气泡参数及提升外观质量的消泡剂和引气剂复合使用方案。结果表明：适量的消泡剂和引气剂复合使用，可提升混凝土的含气量稳定性，降低硬化混凝土气泡间距系数和平均孔径，有效改善混凝土外观形貌。消泡剂掺量0.003，引气剂掺量0.01时，混凝土含气量稳定性最佳。消泡剂掺量0.001，引气剂掺量0.03时，混凝土气泡间距系数最小。%The influence of different proportion of anti foaming agent and air entrainment agent on the bubble parameters of concrete was studied by using the gas meter and the bubble parameter analysis system.Based on the relationship between the bubble parameters and the appearance of concrete,a scheme to optimize the parameters of concrete and improve the appearance quality by using different propor-tion of anti foaming agent and air entrainment agent was proposed.The results show that the content of the concrete in dynamic and static process can be improved by using proper amount anti foaming agent and air entrainment agent.When the amount of the anti foaming agent and air entrainment agent is 0.03 and 0.1 in ten thousand respectively,the stability of the concrete is the best.When the amount of the anti foaming agent and air entrainment agen is 0.01 and 0.3 in ten thousand respectively,the concrete bubble spacing coefficient is the smallest.