混凝土表面电阻率影响因素试验研究

Experimental research on the influencing factors of concrete surface resistivity

通过研究细骨料种类、粉煤灰与矿渣粉掺量、水灰比、环境温度以及养护方式等因素对混凝土表面电阻率的影响,为表面电阻率在混凝土工程中的应用提供参考。结果表明:在相同龄期、相同养护方式下,细骨料种类的改变对表面电阻率基本无影响;粉煤灰与矿渣粉掺量的改变对表面电阻率虽有影响,但影响程度较小;水灰比、环境温度的改变对表面电阻率有较大影响。湿养护和干燥养护方式下,随龄期的延长表面电阻率的变化规律不同,养护方式对表面电阻率影响较大。

The variation law of concrete surface resistivity is studied in this paper,by changing five different factors such as fine aggregate type,fly ash and slag powder content,water-cement ratio,ambient temperature and curing method,which lays the foundation for the application of surface resistivity in concrete engineering.The research results show that:under the same age and the same maintenance mode,the change of fine aggregate type has basically no effect on the surface resistivity of concrete;the change in the amount of fly ash and slag powder has some influence on the concrete surface resistivity,but the degree of influence is small;changes in water-cement ratio and ambient temperature have a greater effect on the concrete surface resistivity.The change law of resistivity varies with the age,whether it is in the wet curing mode or the dry curing mode,and the curing mode has a great influence on the concrete surface resistivity.