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本文对不同水胶比、不同粉煤灰掺量下的混凝土,利用ASTM C1202试验方法,测定了在标准养护条件下14d、28d和90d的6h电通量值。结果表明,标准养护28d时,适当粉煤灰掺量下,低水胶比的混凝土比高水胶比的混凝土具有更好的抗氯离子渗透性能;水胶比0.5以上时,水化早期随着粉煤灰掺量的增加混凝土电通量增加,水化后期则随着粉煤灰掺量的增加电通量急剧下降;0.35以下水胶比的混凝土氯离子抗渗透性能高于0.5以上水胶比的混凝土,且掺粉煤灰混凝土更适合采用长龄期的电通量来评价混凝土的抗氯离子渗透性能。
In this paper, different water cement ratio, different fly ash content of concrete, the use of ASTM C1202 test method, measured under standard curing conditions 14d, 28d and 90d 6h flux value. The results showed that the concrete with low water cement ratio had better resistance to chloride ion permeability than the concrete with high water cement ratio at the proper curing time of 28d with appropriate fly ash content. When the water-cement ratio was above 0.5, With the increase of fly ash content, the electric flux of concrete increased, but the flux decreased sharply with the increase of fly ash content at later stage of hydration. The chloride ion permeability of concrete with water-cement ratio below 0.35 was higher than that of water above 0.5 Plastic ratio of concrete, and fly ash concrete is more suitable for the use of long-term electric flux to evaluate the concrete resistance to chloride ion permeability.