隧道衬砌统砂石混凝土试验与研究

统砂石混凝土(也称细石混凝土)，是由水、水泥及小石子组成的混凝土。目前隧道工程中混凝土使用量越来越多，但优质的天然砂资源日渐枯竭，推广应用统砂石混凝土是必要的。文章采用正交试验的方法研究了砂率、减水剂掺量及水泥用量对统砂石混凝土和易性、28d抗压强度的影响，并同普通混凝土做比较。结果表明，用统砂石配制的混凝土和易性好、28d抗压强度可达35MPa，优于普通天然砂混凝土，为统砂石混凝土应用于隧道工程中提供了依据。

Experimental study on tunnel lining fine stone concrete

The sand stone concrete (or fine stone concrete),is mixed with water,cement and fine stone.Recently,more and more concrete materials have been widely used in tunnel engineering,meanwhile, the natural sand resources with good quality have been gradually exhausted.It is imperative to popularize sand stone concrete.In this paper,the effects of sand percentage,amount of water-reducing agent and cement consumption on the workability of concrete mixture and 28d compressive strength of solid concrete are investigated according to orthogonal experiment.At last,this kind of concrete is compared with ordinary concrete.The results show that the concrete mixed with the sand stone has good workability and its compressive strength of 28d age is 35 MPa.It is better to that of ordinary concrete.It may be used as references for tunnel engineering application of sand stone concrete.