采用特细砂制作石灰砂混凝土空心楼板，比同规格的水泥空心楼板可降低成本２０％～２７％。作者研究了这类楼板产生自应力的原因及其影响因素；开发成功的预应力构件克服了自应板性能不足，有良好的结构性能并且显著降低成本和能耗；作者提出开发部分预应力与自应力相结合的新产品的设想 The production of lime sand concrete hollow floor slabs using extra fine sand can reduce the cost by 20% to 27% compared with the same specifications of hollow concrete floor slabs. The authors studied the reasons for the self-stress generated by this kind of floor slab and the influencing factors; the successful development of prestressed members overcomes the lack of self-property plate performance, has a good structural performance and significantly reduces the cost and energy consumption; the author proposes to develop partial prestressing and The idea of ​​combining new products with stress