Construction of structure self waterproof concrete

1 防水混凝土的材料及配比水泥品种应按设计要求选用，其强度等级不应低于32.5级。粗骨料的自然级配适宜，粒径宜为5~40mm，含泥量不得大于1％。防水混凝土的配合比要求：试配要求的抗渗强度比设计值提高0.2MPa；水泥用量不低于300kg/m3，掺有活性掺合料时不少于280kg/m3；砂率宜为35%～45%，水灰比不大于0.55；坍落度不宜大于50mm。

1 the materials and proportioning cement varieties of waterproof concrete should be selected according to the design requirements, and the strength grade should not be lower than grade 32.5. The natural gradation of coarse aggregate is suitable, the particle size should be 5~40mm, and the content of mud should not be more than 1%. The mix proportion requirements of waterproof concrete: the impervious strength of the test requirements is increased by 0.2MPa compared with the design value; the cement dosage is not less than 300kg/m3, and the active admixture is not less than 280kg/m3; the sand ratio is 35% to 45%, the water cement ratio is not greater than 0.55, and the slump is not more than 50mm.

2 施工要点

2 key points of construction

⑴ 防水混凝土工程的模板应平整、拼缝严密不漏浆。一般不宜用螺栓或铁丝贯穿混凝土墙固定模板，当需用螺栓贯穿混凝土墙固定模板时，应采取止水措施。如采用工具式螺栓,螺栓中间加焊止水钢板,螺栓两端设垫木等。① 工具式螺栓做法：用工具式螺栓将防水螺栓固定并拉紧，拆模时，将工具式螺栓拆下，再以嵌缝材料及聚合物水泥砂浆将螺栓凹槽封堵严密。

The waterproof concrete formwork should be smooth, patchwork tight without leakage. In general, bolts or wire should not be used to fix the formwork through the concrete wall. When the bolt is used to fix the formwork of the concrete wall, the water stop measures should be taken. For example, the tool bolts are used, the steel plates are welded in the middle of the bolts, and the bolts at both ends of the bolts are set up. The tool type bolt approaches: tool type bolt bolt and tighten the waterproof, Chaimo, tool type bolts removed, then the mortar caulking material and polymer cement bolt tight sealing groove.