Effect of Steam Curing Temperature on Impermeability Performance of High-Strength Concrete
In order to further grasp the influence law of steam curing temperature on the impermeability performance of high-strength concrete and optimize the curing regime of steam cured concrete,the capillary water absorption and pore structure of the high-strength concrete mixed with fly ash(FA)and granulated blast furnace slag(GGBS)were experimentally investigated under the temperature condition of 20℃ to 80℃.The influence of curing temperature on the impermeability performance of high-strength concrete was analyzed by taking the coefficient of capillary adsorption as an index.The effect of curing temperature on the pore structure of concrete was analyzed using the total porosity and the proportion of pores with different pore sizes as indicators.The results show that the capillary water absorption and total porosity of steam cured concrete increase significantly with the increase of curing temperature,and the capillary adsorption coefficient of concrete increases by 11.3%to 87.4%when the curing temperature is 60℃to 80℃compared with that under standard curing conditions.With the increase of curing temperature,the proportion of harmful pores and polyhazardous pores in concrete increases by 3.86%to 27.4%,and the coarsening of pore structure becomes more obvious.The curing temperature used for steam cured concrete should not exceed 60℃ to ensure that the concrete has good impermeability properties.
steam curing temperaturehigh-strength concreteimpermeability performancecapillary water absorptionpore structure
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