文章通过正交试验，研究了水胶比、粉煤灰掺量、沙漠砂替代率及聚丙烯纤维掺量对沙漠砂自密实混凝土28 d抗折强度的影响规律，通过极差分析确定了最佳配比，并对最佳配比下的沙漠砂自密实混凝土性能进行验证。结果表明，制备条件对混凝土28 d抗折强度的影响排序为：沙漠砂替代率 >水胶比 >聚丙烯纤维掺量 >粉煤灰掺量，最佳参数组合为A₁B₃C₃D₃。与ASC-0相比，ASC-3组的开裂抑制率高达54%，干缩率降低了18.3%。因此，聚丙烯纤维能够改善沙漠砂混凝土的力学性能、抗裂性能及抗收缩性。

The influence of water-glue ratio, fly ash content, desert sand substitution rate and polypropylene fiber content on the 28 d flexural strength of desert sand self-compacting concrete was studied through orthogonal test. The results show that the effects of preparation conditions on the flexural strength of concrete at 28 d are in the order of desert sand substitution rate>water-glue ratio>polypropylene fiber content>fly ash content, and the optimal parameter combination is A₁B₃C₃D₃. Compared with ASC-0, the cracking inhibition rate of the ASC-3 group is as high as 54%, and the dry shrinkage rate is reduced by 18.3%. Therefore, polypropylene fiber can improve the mechanical properties, crack resistance and shrinkage resistance of desert sand concrete.