Experimental Study on the Workability and Compressive Performance of Manufactured Sand UHPC with Different Cementitious Material Mix Ratios
Orthogonal experiments were utilized in this study to investigate the impact of varying cementitious material mix ratios on the fundamental properties of ultra-high performance concrete(UHPC),and to investigate the workability and compressive properties of mechanism sand incorporated into UHPC.The result indicates that the com-bined use of silica fume,fly ash,and slag can enhance the performance of Ultra-high performance concrete(UHPC).When the silica fume content is less than 30%,the strength increases as the content increases;However,when the silica fume exceeds 30%,the early-age strength decreases,but the later-age strength increases more rapidly.The incorporation of fly ash can improve the early-age strength of the concrete,but the later-age strength growth rate significantly decreases when the content exceeds 50%.Slag can improve the fluidity of UHPC.Through comprehensive mixing proportions,the optimal mix ratio results in a mechanically-sand-based UHPC with a fluidity of 255 mm,a 3-day compressive strength of 121.6MPa,and a 7-day compressive strength of 139.8MPa.
万方数据
维普
