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大坝混凝土施工工艺一直在改进,以使其发挥强度高、抗渗、抗磨、抗腐蚀的特性。然而,受混凝土材质选用、生产拌制、运输、入仓、平仓振捣、养护及混凝土结构形状、大小、模板工艺等诸多因素制约,一些蜂窝、麻面、混凝土温度裂缝、应力裂缝及施工缝等问题在所难免。防水处理是混凝土施工的重要一环,传统防水材料有其优点,但也有局限性,如卷材与涂料,虽然呈现弹性或柔性的特点,耐久性也较好,但与基面混凝土总存在着“隔”的问题,潮湿与渗水始终是其大敌,不宜作背水面和潮湿基面的防水。至于一般的防水砂浆类材料,抗裂性差是其致命弱点。加拿大凯顿国际公司在加拿大生产且原装进口的水泥基渗透结晶型防水材料能与混凝土本体材料融为一体,用作背水面及迎水面的防水与修补,这是其它材料难以企及的。
Dam concrete construction technology has been improved to make it to play high strength, impermeability, abrasion resistance, corrosion resistance characteristics. However, due to the selection of concrete materials, the production of mixing, transportation, warehousing, warehousing vibration, maintenance and concrete structure shape, size, template technology and many other constraints, some honeycomb, pitted, concrete temperature cracks, stress cracks and construction Seams and other issues are inevitable. Waterproof treatment is an important part of concrete construction. The traditional waterproof material has its advantages, but also has its limitations, such as the coil and the coating, although it has the characteristics of elasticity or flexibility and the durability is better, but the concrete with the base surface always exists “Every other ” issue, moisture and water seepage is always its enemy, not suitable for back and moist water-based surface. As for the general waterproof mortar material, poor crack resistance is its fatal weakness. Canada Kai Dayton International Company in Canada and the production of imported cementitious capillary crystalline waterproofing material can be integrated with the concrete body material used to waterproof and repair of the back and facing the water, which is difficult to match with other materials.