含气量与气泡参数对混凝土性能的影响研究  

Influence of Air Content and Hardened Concrete Bubbles Parameters on Frost Resistance of Concrete

作　　者：许文英 张利俊 张瑞 王博 武俊宇 

机构地区：[1]中国国检测试控股集团北京有限公司,北京100113 [2]建研建硕(北京)科技有限公司,北京100013

出　　处：《混凝土世界》2022年第12期26-29,共4页China Concrete

基　　金：中国建筑材料科学研究总院有限公司青年科学基金项目(ZD-13)。

摘　　要：针对不同含气量混凝土的力学性能和抗冻性能,以及硬化混凝土的气泡参数进行试验,研究不同含气量和气泡参数的混凝土在冻融循环作用下的抗冻性能,分析含气量及气泡参数对混凝土抗冻性能的影响规律,获得较佳混凝土抗冻性能的适宜含气量和气泡参数指标。结果表明,适当提高混凝土的含气量可显著提高混凝土的抗压强度及抗冻性能;含气量达到5.4%时,硬化混凝土气泡间距系数为146.682μm,平均气泡直径为71.948μm,单位面积气泡个数为4.138mm^(2),其具备良好的抗压强度及抗冻性能,28d强度达49.9MPa,F300质量损失率为0.16%,F300相对弹性模量为94.0%。Aiming at the mechanical properties and frost resistance of concrete with different air content and the bubble parameters of hardened concrete,the frost resistance of concrete with different air content and bubble parameters under the action of freeze-thaw cycle is st udied,the inf luence of air content and bubble parameters on the frost resistance of concrete is analyzed,and the appropriate air content and bubble parameters are obtained to optimize the frost resistance of concrete.The results show that properly increasing the air content of concrete can significantly improve the compressive strength and frost resistance of concrete;when the air content reaches 5.4%,the bubble spacing coefficient of hardened concrete is 146.682μm.The average bubble diameter is 71.948μm.The number of bubbles per unit area is 4.138mm~2,which has good compressive strength and frost resistance.The 28d strength is 49.9MPa,the mass loss rate of F300 is 0.16%,and the relative elastic modulus of F300 is 94.0%.

关 键 词：气泡间距系数 混凝土含气量 抗冻性能 

分 类 号：TU528[建筑科学—建筑技术科学]