弯曲应力作用下钢纤维混凝土氯离子侵蚀性能
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摘要
研究弯曲应力作用下钢纤维混凝土的氯离子侵蚀性能,分析了钢纤维掺量、弯曲应力水平对混凝土氯离子含量、氯离子扩散系数的影响规律。结果表明,钢纤维的存在能改善弯曲应力作用下的氯离子侵蚀性能,钢纤维掺量为1. 5%时,改善效果最明显。弯曲应力的存在加速了氯离子在钢纤维混凝土中的扩散速度、增大了混凝土氯离子含量,应力水平越大时影响越明显。钢纤维混凝土氯离子扩散系数与应力水平间存在指数型数学关系式,最终建立了钢纤维混凝土氯离子扩散系数随应力水平变化的数学模型。
The performances of chloride ion corrosion of steel fiber concrete under bending stress were studied. The influence of steel fiber addition and bending stress level on chloride ion content and diffusion coefficient of concrete were analyzed. The results show that steel fiber can improve the performances and the improvement effect is most obvious with the steel fiber content is 1. 5%. The diffusion rate of chloride ions in concrete is accelerated and the chloride ion content is increased under bending stress. It is found that there is an exponential mathematical relationship between chloride ion diffusion coefficient and stress level of steel fiber concrete. Based on the experiments and analysis,a mathematical model for the variation of chloride ion diffusion coefficient with stress level of steel fiber concrete is established.
The performances of chloride ion corrosion of steel fiber concrete under bending stress were studied. The influence of steel fiber addition and bending stress level on chloride ion content and diffusion coefficient of concrete were analyzed. The results show that steel fiber can improve the performances and the improvement effect is most obvious with the steel fiber content is 1. 5%. The diffusion rate of chloride ions in concrete is accelerated and the chloride ion content is increased under bending stress. It is found that there is an exponential mathematical relationship between chloride ion diffusion coefficient and stress level of steel fiber concrete. Based on the experiments and analysis,a mathematical model for the variation of chloride ion diffusion coefficient with stress level of steel fiber concrete is established.
引文
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[11]Sun W,Mu R,Luo X,et al.Effect of chloride salt,freeze-thaw cycling and externally applied load on the performance of the concrete[J].Cement and Concrete Research,2002,32(12):1859-1864.
[12]Midgley H G,Illston J M.Effect of chloride penetration on the properties of hardened cement pastes[C].7th international congress on the chemistry of cement,1986,3:101-103.
[13]Thomas M D A,Bamforth P B.Modelling chloride diffusion in concrete:effect of fly ash and slag[J].Cement and Concrete Research,1999,29(4):487-495.
[2]白敏,牛荻涛,姜桂秀,等.冻融循环后钢纤维混凝土氯离子侵蚀性能研究[J].硅酸盐通报,2015,34(9):2506-2510.
[3]林龙镔,赖秀英,丰正伟.杂散电流及氯离子腐蚀共同作用下钢纤维混凝土强度的试验[J].厦门大学学报(自然科学版),2018(3):135-141.
[4]延永东.氯离子在损伤及开裂混凝土内的输运机理及作用效应[D].杭州:浙江大学,2011.
[5]Granju J L,Balouch S U.Corrosion of steel fibre reinforced concrete from the cracks[J].Cement and Concrete Research,2005,35(3):572-577.
[6]El-Dieb A S.Mechanical,durability and microstructural characteristics of ultra-high-strength self-compacting concrete incorporating steel fibers[J].Materials&Design,2009,30(10):4286-4292.
[7]Abbas S,Soliman A M,Nehdi M L.Exploring mechanical and durability properties of ultra-high performance concrete incorporating various steel fiber lengths and dosages[J].Construction and Building Materials,2015,75:429-441.
[8]Tayeh B A,Bakar B H A,Johari M A M,et al.Mechanical and permeability properties of the interface between normal concrete substrate and ultra high performance fiber concrete overlay[J].Construction and Building Materials,2012,36:538-548.
[9]Corinaldesi V,Moriconi G.Durable fiber reinforced self-compacting concrete[J].Cement and Concrete Research,2004,34(2):249-254.
[10]Mu R,Miao C,Luo X,et al.Interaction between loading,freeze-thaw cycles,and chloride salt attack of concrete with and without steel fiber reinforcement[J].Cement and Concrete Research,2002,32(7):1061-1066.
[11]Sun W,Mu R,Luo X,et al.Effect of chloride salt,freeze-thaw cycling and externally applied load on the performance of the concrete[J].Cement and Concrete Research,2002,32(12):1859-1864.
[12]Midgley H G,Illston J M.Effect of chloride penetration on the properties of hardened cement pastes[C].7th international congress on the chemistry of cement,1986,3:101-103.
[13]Thomas M D A,Bamforth P B.Modelling chloride diffusion in concrete:effect of fly ash and slag[J].Cement and Concrete Research,1999,29(4):487-495.