中文摘要：

通过对预拌喷射混凝土用预拌干料的贮存期的试验研究,得到抗拉强度的变化规律。分别研究了预拌干料的砂子含水率在0、0.5%和1.0%的情况下,贮存期分别为3、7、15、20d和28d时,与贮存期为0d相比时抗拉强度的损失。研究结果表明：对于C30混凝土,贮存28 d时,砂子含水率为0.5%和1.0%时的抗拉强度损失率分别为15.3%和18.6%。贮存期的研究为工程使用预拌喷射混凝土提供支持。

英文摘要：

Through the testing research of the storage period of using dry-mixed materials in shotcrete,variation of tensile strength was obtained.According to the study on the storage period of dry-mixed materials in 3,7,15,20 d and 28 d,compared to 0 d,the loss of tensile strength was obtained under different sand water content（0,0.5% and 1.0%）.The results show,tensile strength loss rate of C30 concrete is 15.3% when the sand water content is 0.5% in the 28 d,while strength loss rate is 18.6% when the sand water content is 1.0%.The studies on storage period provide supports to the using of dry-mixed shotcrete in engineering application.