C40抗渗防裂混凝土配合比优化设计及性能研究
Mix proportion optimized design and performance study of C40 impermeability and crack resistance concrete
关键词：
大体积混凝土；配合比优化；聚丙烯纤维；浆骨比；工作性；抗压强度；抗渗性能；抗裂性能
Key words：
Mass concrete; Optimization of mix proportion; Polypropylene fiber; Slurry-aggregate ratio; Workability; Compressive strength; Impermeability performance; Crack resistance
刊期：
2025年第9期
DOI：
10.19761/j.1000-4637.2025.09.063.06
文章编号：
基金项目：
江苏省重点研发计划（社会发展）项目（BE2019642）。
作者：
胡世帅
单位：
中国铁建大桥工程局集团第一工程有限公司，辽宁 大连 116033
摘要
摘 要：为制备出适用于某超深异型潜池大体积混凝土工程要求的C40抗渗防裂混凝土，通过调控水胶比、矿物掺合料掺量和砂率筛选出了2组工作性、强度、抗渗性能较好的混凝土配合比，在此基础上，掺入聚丙烯纤维，提高浆骨比，进行了配合比优化，并测试优化后混凝土的性能。结果表明：通过掺入聚丙烯纤维、提高浆骨比优化配合比后，B7J2X0.9和C4J2X0.9组混凝土的工作性良好，28 d抗压强度均大于45 MPa，抗渗等级均＞P12，抗裂等级均为Ⅱ级，满足超深异型潜池大体积混凝土要求。
Abstract: In order to prepare C40 impermeability and crack resistance concrete suitable for the requirements of a mass concrete project in a certain ultra deep and irregular submerged pool, two sets of concrete mix proportions with good workability, strength, and impermeability were screened by adjusting the water-binder ratio, mineral admixture content, and sand ratio. On this basis, polypropylene fiber were added, the slurry-aggregate ratio was improved, and the mix proportion was optimized. The performance of the optimized concrete was tested. The results show that after adding polypropylene fiber and increasing slurry-aggregate ratio, the workability of B7J2X0.9 and C4J2X0.9 group concrete is good, the compressive strength at 28 d is greater than 45 MPa, the impermeability grade is ＞P12, and the crack resistance grade is Ⅱ, meeting the requirements of mass concrete for ultra deep and irregular submerged pool.
结论
（1）通过调整水胶比、矿物掺合料掺量、砂率设计制备的C40混凝土中，仅B7、C4组试件的工作性、强度、抗渗性能满足超深异型潜池大体积混凝土要求，但抗裂等级和1 h坍落度损失不满足要求。
（2）通过掺入聚丙烯纤维、提高浆骨比来优化B7、C4组混凝土的配合比。随着纤维掺量的增加，试件裂缝减少，抗裂等级提高，而浆骨比的提高会对试件的抗裂性能产生不利影响。
（3）综合优化配合比后混凝土的各项性能来看，B7J2X0.9（水胶比0.38、砂率40%、矿物掺合料掺量25%、聚丙烯纤维掺量0.9 kg/m3、浆骨比0.37）和C4J2X0.9组（水胶比0.4、砂率38%、矿物掺合料掺量25%、聚丙烯纤维掺量0.9 kg/m3、浆骨比0.38）混凝土工作性良好，28 d抗压强度均大于45 MPa，抗渗等级均＞P12，抗裂等级均为Ⅱ级，满足超深异型潜池大体积混凝土工程要求。
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引用本文
胡世帅.C40抗渗防裂混凝土配合比优化设计及性能研究[J].混凝土与水泥制品,2025(9):63-67,73.
HU S S.Mix proportion optimized design and performance study of C40 impermeability and crack resistance concrete[J].China Concrete and Cement Products,2025(9):63-67,73.
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