高韧性长寿命水工混凝土的制备及工程应用探索

勇 黄, 敬 马, 毅 斯, 晓丹 裴, 旭飞 马

摘要


针对严寒地区水工建筑物冻融剥蚀、开裂等病害，以塔克拉玛干沙漠风积沙为细骨料，掺入硅灰、减水剂、消泡剂与钢纤维—玄武岩混杂纤维，制备高韧性长寿命水工混凝土，并研究其力学与抗冻性能。结果表明：水胶比 0.23、砂胶比 0.91、硅灰掺量 10%、减水剂掺量 2.0%、消泡剂掺量 0.28%、钢纤维掺量 2.5%、玄武岩纤维掺量 1.5%时混凝土综合性能最优；蒸汽养护 7 d 抗压强度达 121.6 MPa、抗折强度达 22.5 MPa，仅比石英砂混凝土低约 5%；经 500 次冻融循环后质量损失率仅 0.78%、相对动弹模量保持 99.2%，抗冻等级大于 F500。单方造价较河砂方案降低约 500 元，可为严寒地区水工建筑物长寿命设计提供参考。

关键词


水工混凝土；风积沙；混杂纤维；配合比优化；力学性能；抗冻性能[中图分类号] TV431 [文献标志码] A

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参考


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DOI: https://doi.org/10.32629/jpm.v7i7.8972

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