再生混凝土抗碳化性能试验研究
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摘要
通过9种不同再生粗骨料、再生细骨料取代率下再生混凝土快速碳化试验,系统研究了再生骨料类型及其取代率对再生混凝土抗碳化性能的影响规律。基于试验,分析了分别经受3 d、7 d、14 d和28 d碳化试验后再生混凝土碳化深度和立方体抗压强度变化率;提出了再生混凝土28 d碳化深度预测模型;研究了28 d碳化作用后不同取代率下钢筋再生混凝土抗压承载力。试验结果表明,碳化作用导致混凝土立方体抗压强度升高,且提高幅度随再生骨料取代率的增加而增大;再生混凝土抗碳化性能与普通混凝土相比有所降低,各阶段碳化深度较大,且发展较快;再生骨料的掺入对混凝土碳化后抗压承载力具有不利影响;基于本文提出的再生混凝土碳化深度预测值与试验结果符合较好。
To systemically investigate the influence of the type of recycled aggregate and its substitution ratio on the carbonation resistance of recycled concrete,the accelerated carbonization experiment was conducted on nine kinds of recycled concrete with different replacement rates of recycled coarse aggregate and fine aggregate.Based on the experiment,the carbonation depth and variation of cubic compressive strength after 3 d,7 d,14 d and 28 d carbonation were analyzed.The prediction model of recycled concrete carbonation depth was established through regression analysis.The load-carrying capacity of reinforced recycled concrete prisms after 28 d carbonation was studied.The experiment results indicate that carbonation leads to an increase of the cubic compressive strength,and the extent increases with the increasing displacement ratio of recycled aggregate.Compared with ordinary concrete,the carbonation resistance of recycled concrete is decreased,and the carbonation depth of recycled concrete at different stages is slightly higher than that of ordinary concrete.The incorporation of recycled aggregate has adverse effect on the compressive capacity of concrete after carbonation.The predicted carbonation depth of recycled concrete is in good agreement with the experimental results.
To systemically investigate the influence of the type of recycled aggregate and its substitution ratio on the carbonation resistance of recycled concrete,the accelerated carbonization experiment was conducted on nine kinds of recycled concrete with different replacement rates of recycled coarse aggregate and fine aggregate.Based on the experiment,the carbonation depth and variation of cubic compressive strength after 3 d,7 d,14 d and 28 d carbonation were analyzed.The prediction model of recycled concrete carbonation depth was established through regression analysis.The load-carrying capacity of reinforced recycled concrete prisms after 28 d carbonation was studied.The experiment results indicate that carbonation leads to an increase of the cubic compressive strength,and the extent increases with the increasing displacement ratio of recycled aggregate.Compared with ordinary concrete,the carbonation resistance of recycled concrete is decreased,and the carbonation depth of recycled concrete at different stages is slightly higher than that of ordinary concrete.The incorporation of recycled aggregate has adverse effect on the compressive capacity of concrete after carbonation.The predicted carbonation depth of recycled concrete is in good agreement with the experimental results.
引文
[1]Katz A.Properties of concrete made with recycled aggregate from partially hydrated old concrete[J].Cement and Concrete Research,2003,33(5):703-711.
[2]Gokce H S,Simsek O.The effects of waste concrete properties on recycled aggregate concrete properties[J].Magazine of Concrete Research,2013,65(14):844-854.
[3]Ryu J S.An experimental study on the effect of recycled aggregate on concrete properties[J].Magazine of Concrete Research,2002,54(1):7-12.
[4]Rahal K.Mechanical properties of concrete with recycled coarse aggregate[J].Building and Environment,2007,42(1):407-415.
[5]Kou S C,Poon C S.Mechanical properties of 5-year-old concrete prepared with recycled aggregates obtained from three different sources[J].Magazine of Concrete Research,2008,60(1):57-64.
[6]Yang K H,Chung H S,Ashraf A F.Influence of type and replacement level of recycled aggregates on concrete properties[J].ACI Materials Journal,2008,105(3):289-296.
[7]Safiuddin M,Alengaram U J,Salam M A,et al.Properties of high-workability concrete with recycled concrete aggregate[J].Materials Research,2011,14(2):1-8.
[8]Kou S C,Poon C S.Enhancing the durability properties of concrete prepared with coarse recycled aggregate[J].Construction and Building Materials,2012,35(8):69-76.
[9]Limbachiya M,Meddah M S,Ouchagour Y.Use of recycled concrete aggregate in fly-ash concrete[J].Construction and Building Materials,2012,27(1):439-449.
[10]雷斌,肖建庄.再生混凝土抗碳化性能的研究[J].建筑材料学报,2008,11(5):605-611.
[11]Levy S M,Helence P.Durability of recycled aggregates concrete:a safe way to sustainable development[J].Cement and Concrete Research,2004,34(11):1975-1980.
[12]Thomas C,Setien J,Polanco J A,et al.Durability of recycled aggregate concrete[J].Construction and Building Materials,2013(40):1054-1065.
[13]Amnon K.Properties of concrete made with recycled aggregate from partially hydrated old concrete[J].Cement and Concrete Research,2003,33(5):703-711.
[14]GB/T 50081-2002普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2002.
[15]GB/T 50082-2009普通混凝土长期性能和耐久性能试验方法标准[S].北京:中国建筑工业出版社,2009.
[16]柳俊哲,吕丽华,李玉顺.混凝土碳化研究与进展(2)-碳化速度的影响因素及碳化对混凝土品质的影响[J].混凝土,2005(194):10-13,17.
[17]CECS 220:2007混凝土结构耐久性评定标准[S].北京:中国建筑工业出版社,2007.
[18]肖文广,郭樟根,吴政鹏,等.再生混凝土抗碳化性能试验研究及理论分析[J].土木建筑与环境工程,2015,37(6):47-53.
[2]Gokce H S,Simsek O.The effects of waste concrete properties on recycled aggregate concrete properties[J].Magazine of Concrete Research,2013,65(14):844-854.
[3]Ryu J S.An experimental study on the effect of recycled aggregate on concrete properties[J].Magazine of Concrete Research,2002,54(1):7-12.
[4]Rahal K.Mechanical properties of concrete with recycled coarse aggregate[J].Building and Environment,2007,42(1):407-415.
[5]Kou S C,Poon C S.Mechanical properties of 5-year-old concrete prepared with recycled aggregates obtained from three different sources[J].Magazine of Concrete Research,2008,60(1):57-64.
[6]Yang K H,Chung H S,Ashraf A F.Influence of type and replacement level of recycled aggregates on concrete properties[J].ACI Materials Journal,2008,105(3):289-296.
[7]Safiuddin M,Alengaram U J,Salam M A,et al.Properties of high-workability concrete with recycled concrete aggregate[J].Materials Research,2011,14(2):1-8.
[8]Kou S C,Poon C S.Enhancing the durability properties of concrete prepared with coarse recycled aggregate[J].Construction and Building Materials,2012,35(8):69-76.
[9]Limbachiya M,Meddah M S,Ouchagour Y.Use of recycled concrete aggregate in fly-ash concrete[J].Construction and Building Materials,2012,27(1):439-449.
[10]雷斌,肖建庄.再生混凝土抗碳化性能的研究[J].建筑材料学报,2008,11(5):605-611.
[11]Levy S M,Helence P.Durability of recycled aggregates concrete:a safe way to sustainable development[J].Cement and Concrete Research,2004,34(11):1975-1980.
[12]Thomas C,Setien J,Polanco J A,et al.Durability of recycled aggregate concrete[J].Construction and Building Materials,2013(40):1054-1065.
[13]Amnon K.Properties of concrete made with recycled aggregate from partially hydrated old concrete[J].Cement and Concrete Research,2003,33(5):703-711.
[14]GB/T 50081-2002普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2002.
[15]GB/T 50082-2009普通混凝土长期性能和耐久性能试验方法标准[S].北京:中国建筑工业出版社,2009.
[16]柳俊哲,吕丽华,李玉顺.混凝土碳化研究与进展(2)-碳化速度的影响因素及碳化对混凝土品质的影响[J].混凝土,2005(194):10-13,17.
[17]CECS 220:2007混凝土结构耐久性评定标准[S].北京:中国建筑工业出版社,2007.
[18]肖文广,郭樟根,吴政鹏,等.再生混凝土抗碳化性能试验研究及理论分析[J].土木建筑与环境工程,2015,37(6):47-53.