Preparation technology of high-strength and high workability-retention self-compacting concrete with manufactured sand for steel pipe arch
According to the structural characteristics of a Steel Pipe Arch Bridge in Chongqing and the construction technology requirement of pump-up construction method,the performance requirements of high-strength and high workability-retention of self-compacting concrete with manufactured sand(SCC-MS)are proposed.Aiming at the contradictory between the high strength and super high workability of concrete,the optimizing technologies of mix proportions,aggregate,blended mineral admixtures,compound of chemical admixtures and combined factors were investigated.Finally,the concrete mixtures with the initial slump not less than 260 mm,slump flow not less than 600 mm,inverted slump outflow time not exceeding 8 s and no loss of workability in 4 h,were prepared and their strength grade is higher than C60.Therefore,the preparation technology of high strength SCC-MS with a high workability retention was proposed for the construction of steel arch bridge,providing good technical support for actual construction.
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维普
