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研究了掺入预湿轻细骨料(粉煤灰陶砂)的内养护混凝土与普通混凝土在不同干燥环境下的收缩和相对湿度发展、质量损失、强度发展及开裂风险.结果表明:当暴露在干燥环境时,内养护混凝土的相对湿度下降速率和总体收缩速率均大于普通混凝土,延长密闭养生时间至28d不能显著降低内养护混凝土的总体收缩;干燥环境下内养护混凝土更易失水,从而降低内养护效率;早龄期暴露于干燥环境下的普通混凝土和内养护混凝土的抗压强度和弯拉强度均显著降低;干燥环境下,内养护技术不能显著提高混凝土的抗开裂性能,但在不与外界发生水分交换的条件下,内养护混凝土未出现开裂.因此,内养护混凝土宜用于大体积混凝土或非表层的结构物混凝土中.
The shrinkage and relative humidity development, mass loss, strength development and cracking risk of internally cured concrete mixed with pre-wet friable aggregates (fly ash ceramsite) and ordinary concrete under different dry conditions were studied. The results show that when exposed In dry environment, the relative humidity descent rate and overall shrinkage rate of internal curing concrete are greater than that of ordinary concrete, and prolonging the closed curing time to 28 days can not significantly reduce the overall shrinkage of internal curing concrete; internal curing concrete is more likely to lose water under dry conditions, Internal curing efficiency; early age exposed to dry environment, the ordinary concrete and internal curing concrete compressive strength and bending strength were significantly reduced; dry environment, the internal curing technology can not significantly improve the cracking resistance of concrete, but not Under the conditions of moisture exchange with the outside, the inner curing concrete does not appear cracking, therefore, the inner curing concrete should be used in mass concrete or non-surface structure concrete.