U型混凝土膨胀剂(简称UEA)是一种以硫铝酸盐、硫酸铝、硫酸铝钾和硫酸钙等组成的无机化合物,它掺入水泥中形成膨胀结晶水化物——钙矾石,达到早期和中期合理膨胀的目的。在硅酸盐类水泥中掺入10～14%UEA(取代水泥率),能有效地补偿混凝土干缩和在一定程度上补偿混凝土冷缩,达到抗裂防渗的目的。其突出优点是作结构自防水,节省外防水材料,减少防水混凝土厚度,延 U-type concrete expansion agent (abbreviated as UEA) is an inorganic compound composed of sulphoaluminate, aluminum sulfate, aluminum potassium sulfate and calcium sulfate. It is incorporated into cement to form a swelling crystalline hydrate, ettringite. The purpose of reasonable inflation in the early and mid-term. The addition of 10% to 14% of UEA in silicate cement (replacement of cement) can effectively compensate concrete shrinkage and compensate concrete shrinkage to a certain degree to achieve the purpose of crack resistance and seepage control. Its outstanding advantage is to make the structure self-waterproof, save external waterproof material, reduce the thickness of waterproof concrete, extend