碾压混凝土的抗冻性能及孔隙特征研究
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摘要
碾压混凝土(RCC)的抗冻性能对水工大坝的耐久性非常重要。试验通过几组常用的水胶比、粉煤灰掺量的组合,研究了各因素对碾压混凝土的抗冻性能的影响,并且通过吸水动力法研究各配合比的试件的孔隙特征参数。结果表明,水胶比大的、粉煤灰掺量多的碾压混凝土的平均孔径较大,大孔含量较多,孔隙分布均匀性较差,抗冻性能较差。水中养护比在空气中养护对抗冻有利。
The frost resistance of roller compacted concrete( RCC) is very important to the durability of the hydraulic dams. The influences of various factors on the frost resistance of RCC are studied by freezethaw experiment and the pore structure characteristics of RCC are studied by water absorption by immersion test. The results show that when the water binder ratio or the amount of fly ash gets larger,the average pore size and the content of large pores of RCC will get larger. Besides,the pore distribution uniformity will get worse and the frost resistance of RCC will be poor. Cured in water is benefit to frost resistance of RCC.
The frost resistance of roller compacted concrete( RCC) is very important to the durability of the hydraulic dams. The influences of various factors on the frost resistance of RCC are studied by freezethaw experiment and the pore structure characteristics of RCC are studied by water absorption by immersion test. The results show that when the water binder ratio or the amount of fly ash gets larger,the average pore size and the content of large pores of RCC will get larger. Besides,the pore distribution uniformity will get worse and the frost resistance of RCC will be poor. Cured in water is benefit to frost resistance of RCC.
引文
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[6]周启坤,何湘安,王元安.粗骨料裹粉对混凝土性能影响的研究[C]//2010年度全国碾压混凝土筑坝技术交流研讨会,2010:59-61.
[7]吴银刚,陈波,杨君,等.冻融循环作用下碾压混凝土抗剪试验分析[J].水电能源科学,2016(12):128-131.
[8] Zarauskas L,Skripkiūnas G,Girskas G. Influence of Aggregate Granulometry on Air Content in Concrete Mixture and Freezing-Thawing Resistance of Concrete[J]. Procedia Engineering,2017,172:1278-1285.
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[11] Liu Z,Hansen W. Freeze–thaw durability of high strength concrete under deicer salt exposure[J].Construction&Building Materials, 2016, 102:478-485.
[12] SL 352-2006,水工混凝土实验规程,2006.
[13]陈健中.用吸水动力学法测定混凝土的孔结构参[J].混凝土,1989(6):9-14.
[14] Chen T C, Yeung M R, Mori N. Effect of water saturation on deterioration of welded tuff due to freezethaw action[J]. Cold Regions Science&Technology,2004,38(2):127-136.
[15] Cantin R,Pigeon M. Deicer salt scaling resistance of steel-fiber-reinforced concrete[J]. Cement&Concrete Research,1996,26(11):1639-1648.
[2] Khayat K H,Libre N A. Roller Compacted Concrete:Field Evaluation and Mixture Optimization[J].Compressive Strength. 2014.
[3]李金玉,曹建国.水工混凝土耐久性的研究和应用[M].中国电力出版社,2004.
[4]宋恩来.东北地区大坝溢流面混凝土冻融与冻胀破坏[J].东北电力技术,2000(3):22-26.
[5]梅国兴,刘伟宝.大坝碾压混凝土抗渗抗冻和抗裂的评估[J].水利水电技术,2003,34(4):21-24.
[6]周启坤,何湘安,王元安.粗骨料裹粉对混凝土性能影响的研究[C]//2010年度全国碾压混凝土筑坝技术交流研讨会,2010:59-61.
[7]吴银刚,陈波,杨君,等.冻融循环作用下碾压混凝土抗剪试验分析[J].水电能源科学,2016(12):128-131.
[8] Zarauskas L,Skripkiūnas G,Girskas G. Influence of Aggregate Granulometry on Air Content in Concrete Mixture and Freezing-Thawing Resistance of Concrete[J]. Procedia Engineering,2017,172:1278-1285.
[9]杨华美.高钛矿渣作为水工混凝土掺和料及骨料性能研究[D].长江科学院,2010.
[10] Rad S A M,Modarres A. Durability properties of nonair entrained roller compacted concrete pavement containing coal waste ash in presence of de-icing salts[J]. Cold Regions Science&Technology,2017,137:48-59.
[11] Liu Z,Hansen W. Freeze–thaw durability of high strength concrete under deicer salt exposure[J].Construction&Building Materials, 2016, 102:478-485.
[12] SL 352-2006,水工混凝土实验规程,2006.
[13]陈健中.用吸水动力学法测定混凝土的孔结构参[J].混凝土,1989(6):9-14.
[14] Chen T C, Yeung M R, Mori N. Effect of water saturation on deterioration of welded tuff due to freezethaw action[J]. Cold Regions Science&Technology,2004,38(2):127-136.
[15] Cantin R,Pigeon M. Deicer salt scaling resistance of steel-fiber-reinforced concrete[J]. Cement&Concrete Research,1996,26(11):1639-1648.