PVA-纤维素混杂纤维混凝土电阻率和氯离子扩散系数试验研究

Test Research on Chloride Ion Diffusion Coefficient and Electrical Resistivity of Polyvinyl Alcohol/Cellulose Hybrid Fiber Reinforced Concrete

设计了强度等级为C30、C40、C50的PVA-纤维素混杂纤维混凝土,开展了纤维混凝土电阻率和氯离子扩散试验,研究了随着强度等级、龄期、纤维掺量的变化对混杂纤维混凝土的影响,建立了混杂纤维混凝土电阻率和氯离子扩散系数之间的相关关系.研究表明,PVA和纤维素混杂纤维混凝土的性能优于单掺和不掺纤维的混凝土,PVA和纤维素的合理掺量分别为1.2 kg/m^3和0.9 kg/m^3;混杂纤维混凝土的氯离子扩散系数随着强度等级和龄期的增大而减小,电阻率随着强度等级和龄期的增大而增大,氯离子扩散系数和电阻率的回归关系符合Nernst-Einstein方程.

Choosing polyvinyl alcohol and cellulose fibers, we designed three strength grades of which are C30, C40, C50 and carried out the study of chloride ion diffusion coefficient and electrical resistivity of hybrid fiber reinforced concrete. We studied the impact of varying intensity levels, age,content of fiber on double-doped fiber reinforced concrete and established the relevance of electrical resistivity and chloride ion diffusion coefficient of dual-doped fiber concrete. The results showed that the double-doped fiber was better than single-doped fiber and non-doped fiber. The reasonable dosage of PVA and cellulose was 1.2 kg/m3 and 0.9 kg/m3. The chloride ion diffusion coefficient of hybrid fiber concrete decreased with the increasing of strength grade and age,and the resistivity increased with the increasing of strength grade and age. The regression relationship between chloride diffusion coefficient and resistivity was in accordance with Nernst -Einstein equation.