预应力叠合受弯构件在技术与经济方面的优越性在于约占其整个体积的80～90％都是低标号的陶粒混凝土,只是在高强预应力配筋带才采用不低于250号的重混凝土。因此,与重混凝土构件相比,它的重量大大减少;与轻混凝土构件相比,它的水泥用量少。当采用100～150号陶粒混凝土时,由于其水泥用量不低 Prestressed composite flexural members in the technical and economic superiority is that about 80% to 90% of its volume are low-grade ceramsite concrete, but only in the high-strength prestressed tendon with not less than 250 Heavy concrete. As a result, its weight is significantly reduced compared to heavy concrete components; it uses less cement than light-weight concrete components. When using 100 to 150 ceramsite concrete, due to the amount of cement is not low