Effect of Curing Time on the Surface Permeability of Concrete with a Large Amount of Mineral Admixtures

In order to explore the influence of curing time on the surface permeability of concrete, 10 groups of high content fly ash and slag concrete with two kinds of water-binder ratio were designed. There were cured under five curing methods, respectively. The influence of curing time on the surface permeability of concrete was studied. The mechanism was explained by hydration heat and mercury intrusion porosimetry. The results show that inadequate curing time leads to insufficient hydration of cementitious materials in concrete with large amount of mineral admixtures and significant increase in the diffusion of chloride ions on the surface of concrete. Standard curing for 14 days can basically ensure the chloride ion penetration resistance of concrete with large amount of mineral admixture. When the standard curing time is less than 7 days, the chloride ion penetration resistance deteriorates seriously. Under the condition of insufficient standard curing time, adding a small amount of limestone powder can effectively enhance the chloride ion permeability of concrete with a large amount of fly ash and slag.

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