高频内部振捣对混凝土抗冻性的影响  

Effect of Internal High-frequency Vibration on Frost Resistance of Concrete

作　　者：刘艳霞[1] 鲁一晖[1] 陈改新[1] 

机构地区：[1]中国水利水电科学研究院。北京100038

出　　处：《水力发电》2008年第3期34-36,39,共4页Water Power

基　　金：国家自然科学基金资助项目(50579075)

摘　　要：试验采用4种水利水电工程常用的引气剂,分别配制水胶比为0.40、0.45和0.55的二级配引气混凝土,测量高频振捣后混凝土含气量变化和抗冻性。结果表明,高频振捣对混凝土的含气量和抗冻性有显著的影响,高频振捣时间越长、水灰比越大,影响越显著;引气剂品质对混凝土的抗冻性有明显的影响。根据试验结果,给出了不同水胶比混凝土对高频振捣时间的要求,可供施工参考。Four kinds of air-entraining admixtures which were frequently used in hydraulic projects were adopted in the experiments.Concrete made with W/（C＋f） ratios of 0.40,0.45 and 0.55 were subjected to high-frequency vibrations.The test results indicated that high-frequency had great influence on concrete air content and freeze-thaw durabilities.The longer the vibration time or the higher the W/（C＋f） ratio is,the greater the influence is.At the same time,quality of air-entraining admixture also had obvious effect on frost resistance of high-frequency vibrated concrete.According to the test results,appropriate high-frequency vibration time for concrete with different w/c ratios was proposed.

关 键 词：高频振捣 引气剂 含气量 抗冻性 混凝土 

分 类 号：TV461[水利工程—水工结构工程] TU645[建筑科学—建筑技术科学]