干燥条件对混凝土强度影响试验研究
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国家自然科学基金资助项目(51379178);中央高校基本科研业务费专项资金资助项目(ZD2012015)


Experimental Study on Concrete Strength for Different Drying Conditions
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    摘要:

    采用电热恒温鼓风干燥箱对混凝土试件进行干燥,干燥温度设置为60,85,105,120,150℃,干燥机制设置为持续干燥和间歇循环干燥,观测干燥过程中试件的质量变化;待试件自然冷却后对其进行抗压强度和劈裂抗拉强度试验.结果表明:不同干燥条件下混凝土失水量、干燥时间和干燥状态均不同;混凝土抗压强度随干燥温度的升高呈现先降后升的趋势,而劈裂抗拉强度则基本呈线性减小趋势;相同干燥温度下,间歇干燥后混凝土抗压强度高于持续干燥条件下的相应值,而劈裂抗拉强度低于持续干燥条件下的相应值;105℃下的持续干燥对混凝土抗压强度和劈裂抗拉强度损伤均最小,为合理干燥控制条件.

    Abstract:

    Concrete specimens were dried in an electric thermostatic drier with forced convection at 60,85,105,120,150℃. The drying mechanism was set to continuous and intermittent drying, the variation in mass of concrete specimens was observed throughout the drying process.Compressive strength and splitting tensile strength tests were conducted after the concrete specimens were naturally cooled. The results indicate that the quantity of lost concrete moisture, drying time, and drying status are distinct for different drying conditions.With an increase in the drying temperature, the concrete compressive strength exhibited a rise after decreasing trend, but the splitting tensile strength exhibited a linear decreasing trend.At the same drying temperature, the compressive strength with intermittent drying is higher than the compressive strength with continuous drying, whereas the splitting tensile strength with intermittent drying is lower than that with continuous drying.Minimal damage to the concrete compressive strength and the splitting tensile strength with continuous drying was observed at 105°C, which also controls the condition for rational drying.

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张国辉,李宗利,张林飞,吕从聪.干燥条件对混凝土强度影响试验研究[J].建筑材料学报,2015,18(5):840-846

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  • 收稿日期:2014-05-29
  • 最后修改日期:2014-07-09
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  • 在线发布日期: 2015-10-29
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