Effect of Material Constituents and Mix Design on Performance of SCC for Precast, Prestressed Girders
An extensive investigation was undertaken to evaluate the influence of binder type, water-to-cementitious materials ratio (w/cm), type of coarse aggregate, and maximum size of aggregate (MSA) on workability and strength development of self-consolidating concrete (SCC) designated for precast, prestressed bridge girders. In total, 30 SCC mixtures were investigated. In total, 24 mixtures were non air-entrained and were prepared using crushed aggregate or gravel with three MSA of 10, 14, and 20 mm. The w/cm was set to a relatively low value of 0.33 and a higher value of 0.38. Three different binder compositions were investigated. The effect of slump flow consistency on performance was also investigated. Test results indicate that SCC made with the higher w/cm exhibited superior fluidity retention, passing ability, and filling capacity. Mixtures proportioned with the lower w/cm developed greater stability. Mixtures made with the crushed aggregate of 10 mm MSA exhibited greater passing ability, higher filling capacity, and better retention of air content than similar SCC prepared with 14 and 20 mm MSA. Mixtures proportioned with the gravel had superior passing ability, filling capacity and similar stability compared to those made with crushed aggregate of the same MSA.
KeywordsCompressive Strength Coarse Aggregate Slump Flow Steam Cure Crushed Aggregate
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