摘   要：为实现机制砂自密实混凝土在钢管拱中获得良好的应用，研究了机制砂自密实混凝土的最佳配合比，进行了现场模拟试验，并提出了施工技术要点。试验制备出初始坍落度大于270 mm、坍落扩展度大于700 mm、倒坍落度筒流出时间小于5 s、6 h内工作性基本无损失、具有一定补偿收缩性能的钢管拱机制砂自密实混凝土。现场模拟试验验证了机制砂自密实混凝土可以无死角填充有机玻璃管。此外，经良好的现场施工组织与控制、浇筑过程监控，使得钢管拱机制砂自密实混凝土在工程中成功应用。

Abstract: In order to achieve the better application of manufactured sand self-compacting concrete (MS-SCC) in steel pipe arch. The optimum mix ratio of MS-SCC was studied, field simulation tests were carried out and the key construction technologies were put forward. MS-SCC filled steel pipe arch was prepared with the properties such as initial slump more than 270 mm, slump flow above 700 mm, dropping time of concrete from inverted slump cone less than 5 s, 6 h slump zero-loss and shrinkage-compensating. Field simulation tests show that the MS-SCC can be completely filled with plexiglass pipes. By the good construction organization, control and perfusion process monitoring on-sit. MS-SCC can be applied in the steel pipe arch project successfully.