Patterns of Water Movement Inside Early-age Concrete Subjected to Different Curing Methods

ZHANG Xiao, ZHAO Hong-duo, ZHAO Dui-jia

China Journal of Highway and Transport ›› 2015, Vol. 28 ›› Issue (3) : 20-27.

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China Journal of Highway and Transport ›› 2015, Vol. 28 ›› Issue (3) : 20-27.

Patterns of Water Movement Inside Early-age Concrete Subjected to Different Curing Methods

  • ZHANG Xiao1,2, ZHAO Hong-duo1, ZHAO Dui-jia2
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Abstract

In order to study the development of moisture inside cured early-age concrete, the relative humidity (RH) inside early-age concrete was measured by humidity sensor. The water movement patterns of early-age concrete under with three water cement ratios subjected to three commonly used curing methods in concrete pavements were analyzed. A one dimensional water movement model for early-age concrete under external drying with curing factor considered was established. The model was validated using tested data in laboratory. The results show that the effect of water cement ratio on self-desiccation considered is significant. Lower water cement ratio tends to result in larger RH reduction. For RH reducing rate inside concrete the air curing is greater than membrane-forming compound curing and water curing. RH reduction with both effects of external drying and self-desiccation considered in early-age concrete is sensitive to curing method. It can be concluded that incorporating the concept of curing factor in the Dirichlet boundary condition is appropriate for modeling of water movement in cured early-age concrete.

Key words

road engineering / cement concrete pavement / experimental study / water movement / relative humidity / curing / self-desiccation

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ZHANG Xiao, ZHAO Hong-duo, ZHAO Dui-jia. Patterns of Water Movement Inside Early-age Concrete Subjected to Different Curing Methods[J]. China Journal of Highway and Transport, 2015, 28(3): 20-27

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