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.
维普
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