Abstract: To compound C50 in the constructiion of box-girder of the superstructure of Huanghuayuan bridge, medium sands made in Jianyuang are rreplaced by composite mortars made up of machine-processed sands and sands made in Quhe. The practical application and the analysis of experimental data sow that working behavior and mechanics performance of the composite mortars are basically similar to that of concrete compounded by the medium sands made in Jianyang. Besides, the application of the composite mortars has attained remarkable economic benefits. Thereby, the development, spread and application of this kind of technology in city of Chongqing will be certain to bring about tremendously great economic benefits.

Key words: machine-processed sands, C50, engineering practical summary

摘要： 通过对机制砂与渠河砂复合取代简阳砂配制黄花园大桥主桥箱梁C50砼的试验与工程实践表明,复合砂的工作性能和主要力学性能与简阳中砂配制的砼基本相同;且经济效益显著.此项技术在我市范围开发、推广和应用必将产生巨大的技术经济效益.

关键词: 机制砂, C50砼, 工程应用