【摘要】 通过对90个钢纤维混凝土与老混凝土粘结复合圆台柱体试件的抗渗试验,研究钢纤维体积率分别为0、0.5%、1.0%、1.5%2、.0%的新混凝土与普通老混凝土粘结面的抗渗性能。主要考察钢纤维体积率、界面剂类型、界面处理方法等因素对粘结面渗透性能的影响,并对钢纤维混凝土与老混凝土粘结面的渗流特性及层面力学参数进行初步探讨。结果表明,界面剂的使用有利于钢纤维混凝土与老混凝土粘结面抗渗性能的改善。钢纤维的加入能改善新老混凝土粘结面抗渗性能,在一定范围内,随着新混凝土中钢纤维体积率的增加,粘结面抗渗性能不断增加。钢纤维体积率为1.5%时,钢纤维对粘结面抗渗性能的增益比达27%。在试验基础上,建立了钢纤维混凝土与老混凝土粘结面渗流计算模型。更多还原

【Abstract】 The impermeability of bonding interface between new steel fiber reinforced concrete and existing concrete of 90 composite cylindrical specimens is studied expeimentally.The new concrete of bonding specimens is reinforced with steel fiber of different volume fraction,such as 0,0.5%,1.0%,1.5% and 2.0%.The influences of steel fiber volume fraction,interface agent and surface roughness on the permeability are investigated and the characteristics and mechanical parameters of bonding interface between new steel fiber reinforced concrete and existing concrete are studied.The results show that the interface agent and the steel fiber can improve the impermeability of bonding interface,the impermeability of bonding inteface is continually increased with the increment of steel fiber volume fraction,the increment ratio of impermeability reaches 27% when the steel fiber volume fraction is 1.5% in new concrete.Based on experimental results,the calculating formula of permeability on bonding interface between new steel fiber reinforced concrete and existing concrete is put forward.更多还原