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研究了自然环境、水中养护、薄膜覆盖3种养护条件对不同粉煤灰掺量混凝土表面吸水率以及表面层(1~5 cm)混凝土的电阻率影响.结果表明,混凝土表面层的吸水率以及电阻率对养护条件特别敏感,掺粉煤灰可降低混凝土的表面吸水率;养护条件主要影响距离表面1~3 cm处混凝土的电阻率,27 d水中养护后,掺粉煤灰试件电阻率与基准试件相差不大,而6 d水中养护和自然养护后,掺粉煤灰试件电阻率明显比基准试件大,且随粉煤灰掺量的增加而增大,从电阻率变化范围来看,27 d水中养护试件的电阻率最小,其次是6 d水中养护的试件,而自然养护的试件最大.混凝土表面电阻率变化能较好反映养护质量的好坏,基于这种变化,对混凝土的养护效果进行定量评价是可行的.
The effects of three kinds of curing conditions, including natural environment, water curing and film covering, on the water absorption of concrete with different fly ash contents and the concrete resistivity of surface layer (1 ~ 5 cm) were studied.The results showed that the water absorption of concrete surface layer and Resistivity is particularly sensitive to curing conditions, and fly ash can reduce the surface water absorption of concrete. The curing conditions mainly affect the concrete resistivity at 1 ~ 3 cm from the surface. After 27 days of water curing, the resistivity of concrete mixed with fly ash Compared with the reference specimen, after 6 days of water curing and natural curing, the resistivity of the specimen mixed with fly ash was obviously larger than that of the reference specimen and increased with the increase of the content of fly ash. From the change of resistivity In terms of the range, the resistivity of the cured specimens in 27 days was the lowest, followed by the specimens cured in 6 days, while the specimens in natural conservation were the largest. The variation of surface resistivity of concrete could better reflect the quality of maintenance, Variety, the conservation effect of concrete quantitative evaluation is feasible.