氯盐侵蚀环境下钢纤维再生混凝土抗压性能试验研究
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摘要
探讨了钢纤维再生混凝土在氯盐侵蚀环境下的抗压性能。首先,在室内配制水灰比分别为0.45、0.53、0.61的标准立方体钢纤维再生混凝土试件各27个,在标准条件下养护28d;再将这三种水灰比的试件分别浸入浓度为2.0%、3.5%、5.0%的Na Cl溶液中浸泡50d、100d、150d,并测得其抗压强度;最后分别对标准立方体试件上深度为5mm~25mm处的氯离子含量进行了测定。试验结果表明:随着水灰比的减小,钢纤维再生混凝土抗压强度逐渐增大;在浸泡天数相同的条件下,其抗压强度随着氯离子浓度的增加呈降低趋势,且在同一深度下水灰比越大的试件,侵入的氯离子浓度越高;在浸泡浓度相同的条件下,其抗压强度随着浸泡时间的增长而降低。
According to formulated steel fiber recycled concrete standard, cube specimens of which water-cement ratio is 0.45, 0.53, 0.61 indoor and each of 27, and at a concentration of 2.0%, 3.5%, 5.0% Na Cl solution soak 50 d, 100 d, 150 d after curing 28 d under standard conditions are prepared, for the purpose to investigate steel fiber recycled concrete compressive properties under the chloride salt penetration. The compressive strength and chloride ion content are obtained by experiments, which show that the compressive strength is increased with decreasing the water-cement ratio, the compressive strength shows a downward trend with the increase of chloride ion concentration under the same soak days, and the bigger the water-cement ratio, the higher the invasive chloride ions at the same depth of specimen. The compressive strength is decline with the increase of soaking time under the conditions of same soak concentration.
According to formulated steel fiber recycled concrete standard, cube specimens of which water-cement ratio is 0.45, 0.53, 0.61 indoor and each of 27, and at a concentration of 2.0%, 3.5%, 5.0% Na Cl solution soak 50 d, 100 d, 150 d after curing 28 d under standard conditions are prepared, for the purpose to investigate steel fiber recycled concrete compressive properties under the chloride salt penetration. The compressive strength and chloride ion content are obtained by experiments, which show that the compressive strength is increased with decreasing the water-cement ratio, the compressive strength shows a downward trend with the increase of chloride ion concentration under the same soak days, and the bigger the water-cement ratio, the higher the invasive chloride ions at the same depth of specimen. The compressive strength is decline with the increase of soaking time under the conditions of same soak concentration.
引文
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[2]刘数华,冷发光.再生混凝土技术[M].北京:中国建材工业出版社,2007:55-61.(Liu Shuhua,Leng Faguang.Technology of recycled aggregate concrete[M].Beijing:China Building Materials and Industry Press,2007:55-61(in Chinese)).
[3]张雷顺,王娟,黄秋风,等.再生混凝土抗冻性能试验研究[J].工业建筑,2005,35(9):64-66.(Zhang Leishun,Wang Juan,Huang Qiufeng,et al.Experimental study on frost-resistance durability of recycled concrete[J].Industrial Construction,2005,35(9):64-66(in Chinese)).
[4]尹诗钦,屈峰,蒋凌云,等.钢纤维再生混凝土配合比设计及试验研究[J].粉煤灰综合利用,2012(6):14-17.(Yin Shiqin,Qu Feng,Jiang Lingyun,et al.Study on mix design of steel fiber recycled aggregate concrete[J].Fly Ash Comprehensive Utilization,2012(6):14-17(in Chinese)).
[5]Ahmsd S H.Properties of concrete made with north Carolina recycled coarse and fine aggregates,96-007[R].North Carolina,US:Department of Civil Engineering,Center for Transportation Engineering Studies North Carolina State University,1996.
[6]郭秀芹,马建勋,成立涛.混凝土框架-配筋砌体混合结构在竖向力作用下协同工作性能研究[J].应用力学学报,2013,30(4):550-556.(Guo Xiuqin,Ma Jianxun,Cheng Litao.Study on collaborative work performance concrete frame-reinforced masonry mixed structure under vertical force[J].Chinese Journal of Applied Mechanics,2013,30(4):550-556(in Chinese)).
[7]张波志,王社良,张博,等.再生混凝土基本力学性能的试验研究[J].混凝土,2011,261(7):4-6.(Zhang Bozhi,Wang Sheliang,Zhang Bo,et al.Experimental analysis of the basic mechanical properties of recycled concrete[J].Concrete,2011,261(7):4-6(in Chinese)).
[8]中国建筑科学研究院.GB/T 50081-2002普通混凝土力学性能试验方法标准[S].北京:中华人民共和国建设部,2003.(China Academy of Building Research.GB/T 50081-2002 Standard for test method mechanical on ordinary concrete[S].Beijing:Ministry of People’s Republic of China,2003(in Chinese)).
[9]樊禹江,王社良,张博.再生混凝土柱地震破坏Park-Ang模型试验研究[J].应用力学学报,2013,30(4):736-740.(Pu Yujiang,Wang Sheliang,Zhang Bo.Study on Park-Ang model of earthquake damage of recycled aggregate concrete[J].Chinese Journal of Applied Mechanics,2013,30(4):736-740(in Chinese)).
[10]金昌.再生混凝土力学性能指标试验研究[D].武汉:武汉理工大学,2008.(Jin Chang.Study on mechanical properties of recycled aggregate concrete[D].Wuhan:Wuhan University of Technology,2008(in Chinese))
[11]Casuccio M,Torrijos M C,Giaccio G,et al.Failure mechanism of recycled aggregate concrete[J].Construction and Building Materials,2008,22:1499-1506.
[12]宋力,王大国,杨阳,等.基于细观力学的混凝土弹塑脆性损伤研究[J].应用力学学报,2013,30(4):480-487.(Song Li,Wang Daguo,Yang Yang,et al.Study on concrete elastic-plastic brittle damage of micromechanics[J].Chinese Journal of Applied Mechanics,2013,30(4):480-487(in Chinese)).
[13]宋灿,邹超英,徐伟.再生混凝土基本力学性能的试验研究[J].低温建筑技术,2007,117(3):15-16.(Song Can,Zou Chaoying,Xu Wei.Experiment analysis on basic mechanic property of recycled concrete[J].Low Temperature Architecture Technology,2007,117(3):15-16(in Chinese)).
[14]李旭平.再生混凝土基本力学性能研究(I)——单轴受压性能[J].建筑材料学报,2007,10(5):598-603.(Li Xuping.Study on mechanical properties of uniaxial compression performance of recycled aggregate concrete(I)—Behaviour under uniaxial compression[J].Journal of Building Materials,2007,10(5):598-603(in Chinese)).
[15]张健,李秋义,杜俊,等.高性能再生混凝土强度试验研究[J].青岛理工大学学报,2008,29(6):16-21.(Zhang Jian,Li Qiuyi,Du Jun,et al.Study on strength of high performance recycled concrete[J].Qingdao Technological University,2008,29(6):16-21(in Chinese)).
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