This topic includes information related to underwater concrete placed during construction. Underwater concrete is placed using a tremie, a vertical pipe with a funnel shaped top. Mixtures for underwater concrete are designed for a continuous pour and prevention of cement washout. Additives are used in conjunction with cement and aggregate to increase underwater concrete strength.
< div feedintrotext ">有几种专业，或非传统方法放置混凝土。这些方法在现场准备、配件和设备的需要以及降低人工成本方面具有经济优势。如果应用得当， span> span>Shotcrete< span>是一种喷射混凝土，是一种耐用的建筑材料，能与泥土、岩石、钢和现有混凝土牢固结合。喷射混凝土很容易应用，它的模板组件通常比传统的放置更简单，而且使用的材料更少，因为喷射的混凝土层更薄。<强>泵送混凝土> /强>和<强>气动放置混凝土> /强>还包括从干湿混合料中喷射混凝土。两种方法都利用泵，主要是机械类型的泵送混凝土，而气动放置使用压缩空气。对于难以进入或空间有限的场地，这些方法是传统混凝土浇筑的实用替代。< / p > < / div >
This topic includes information related to shotcrete placed during construction. Shotcrete is a wet premixed concrete that is cast onto vertical and overhead surfaces by a compressed air hose. Shotcrete does not require formwork and can be reinforced with steel rods, mesh or fibers.