硫铝酸盐水泥-硅酸盐水泥-石膏三元复合材料的护筋性能研究
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摘要
通过测定水泥石碱度和孔隙率、砂浆电极的极化电位、混凝土的氯离子扩散系数和钢筋混凝土电极电化学加速锈蚀的开裂时间,从多个不同角度研究了硫铝酸盐水泥-硅酸盐水泥-石膏三元复合材料体系的护筋性能。结果表明,三元体系的碱度比硅酸盐水泥低,pH值在10～11之间,难以在钢筋表面形成钝化膜保护;水泥石孔隙率和混凝土氯离子扩散系数均明显高于硅酸盐水泥,密实性和抗渗性较差。
By measuring the alkalinity and porosity of cement paste,the formation of passivation film of mortar electrode,the chloride diffusion coefficient of concrete and the cracking time of reinforced concrete electrode after electrochemical accelerated corrosion,the rebar-protecting property of ternary system was studied from different aspects. The results show that the alkalinity of the ternary system is lower than that of Portland cement. The pH value in the system ranges from 10 to 11,so that the passivation film cannot be formed on the surface of the steel bar. With the porosity and the chloride diffusion coefficient of ternary system being obviously higher than those of Portland cement,the ternary system's density and permeability is poorer.
By measuring the alkalinity and porosity of cement paste,the formation of passivation film of mortar electrode,the chloride diffusion coefficient of concrete and the cracking time of reinforced concrete electrode after electrochemical accelerated corrosion,the rebar-protecting property of ternary system was studied from different aspects. The results show that the alkalinity of the ternary system is lower than that of Portland cement. The pH value in the system ranges from 10 to 11,so that the passivation film cannot be formed on the surface of the steel bar. With the porosity and the chloride diffusion coefficient of ternary system being obviously higher than those of Portland cement,the ternary system's density and permeability is poorer.
引文
[1]徐玲琳.硅酸盐水泥-(硫)铝酸盐水泥混合体系的低温性能和水化机理[D].上海:同济大学,2013.
[2]徐玲琳,杨晓杰,王培铭,等.养护温度对硫铝酸盐水泥基三元体系微结构演变的影响[J].建筑材料学报,2016,19(6):983-987+992.
[3]方楚燕.硅酸盐水泥-硫铝酸盐水泥-石膏复合体系聚合物防水砂浆的制备与性能[D].广州:华南理工大学,2012.
[4]兰明章,崔素萍,王亚丽,等.掺硫铝酸盐水泥熟料的富硅酸盐水泥体系的性能研究[J].水泥,2004(7):12-14.
[5]刘志勇.基于环境的海工混凝土耐久性试验与寿命预测方法研究[D].南京:东南大学,2006.
[6]Jung S H,Saraswathy V,Karthick S,et al.Microstructure characteristics of fly ash concrete with rice husk ash and lime stone powder[J].Concrete Structures and Materials,2018,12(1):1-9.
[7]Chindaprasirt P,Rukzon S.Strength,porosity and corrosion resistance of ternary blend Portland cement,rice husk ash and fly ash mortar[J].Construction and Building Materials,2018,22(8):1601-1606.
[8]Lian C,Zhuge Y,Beecham S.The relationship between porosity and strength for porous concrete[J].Construction and Building Materials,2011,25(11):4294-4298.
[2]徐玲琳,杨晓杰,王培铭,等.养护温度对硫铝酸盐水泥基三元体系微结构演变的影响[J].建筑材料学报,2016,19(6):983-987+992.
[3]方楚燕.硅酸盐水泥-硫铝酸盐水泥-石膏复合体系聚合物防水砂浆的制备与性能[D].广州:华南理工大学,2012.
[4]兰明章,崔素萍,王亚丽,等.掺硫铝酸盐水泥熟料的富硅酸盐水泥体系的性能研究[J].水泥,2004(7):12-14.
[5]刘志勇.基于环境的海工混凝土耐久性试验与寿命预测方法研究[D].南京:东南大学,2006.
[6]Jung S H,Saraswathy V,Karthick S,et al.Microstructure characteristics of fly ash concrete with rice husk ash and lime stone powder[J].Concrete Structures and Materials,2018,12(1):1-9.
[7]Chindaprasirt P,Rukzon S.Strength,porosity and corrosion resistance of ternary blend Portland cement,rice husk ash and fly ash mortar[J].Construction and Building Materials,2018,22(8):1601-1606.
[8]Lian C,Zhuge Y,Beecham S.The relationship between porosity and strength for porous concrete[J].Construction and Building Materials,2011,25(11):4294-4298.