1. Construction of 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 material and proportion of waterproof concrete shall be selected according to the design requirements, and the strength grade shall not be lower than grade 32.5. The natural gradation of coarse aggregate is suitable, the particle size should be 5~40mm, and the clay content should not exceed 1%. The mixture ratio requirement of waterproof concrete: the permeability strength of the test required is 0.2MPa higher than that of 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 should be 35% to 45%, the water cement ratio is not more than 0.55; the slump should not be greater than the 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盖土网 防寒布 麻绳 油麻绳 麻刀 沥青麻绳 静压造型线 自动浇注机 铸铁拍门 钢制拍门 玻璃钢拍门，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。

1. The formwork of waterproof concrete works should be smooth and tight. Generally, it is not advisable to use bolts or iron wires to pass through concrete wall fixed formwork. When using bolts to pass through concrete wall fixed formwork, measures should be taken to stop water. If the tool bolts are used, the middle of the bolts should be welded with water stop steel plates, and the bolts should be laid on both ends. (1) tool bolt method: the tool bolt is used to fix and tighten the waterproof bolt. When the die is broken, the tool bolt is removed and the bolt groove is sealed with sew material and polymer cement mortar.