王全超1,2,周玉娟3,占 文1,2,秦明强1,2,杨 林1,2,黄玉良3
王全超,周玉娟,占文,等.机制砂超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2022(5):26-29,45.
WANG Q C,ZHOU Y J,ZHAN W,et al.Study on Ultra-high Performance Concrete(UHPC) with Mechanism Sand[J].China Concrete and Cement Products,2022(5):26-29,45.
机制砂超高性能混凝土(UHPC)试验研究
王全超1,2,周玉娟3,占 文1,2,秦明强1,2,杨 林1,2,黄玉良3
王全超,周玉娟,占文,等.机制砂超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2022(5):26-29,45.
WANG Q C,ZHOU Y J,ZHAN W,et al.Study on Ultra-high Performance Concrete(UHPC) with Mechanism Sand[J].China Concrete and Cement Products,2022(5):26-29,45.
摘 要:为配制经济型超高性能混凝土(UHPC),在标准养护制度下,采用机制砂取代石英砂,研究了机制砂细度及其级配对UHPC性能的影响,并结合扫描电子显微镜(SEM)分析其高强机理。结果表明:采用合理级配机制砂可显著提高UHPC试件的工作性及力学性能,并可制备出扩展度为680 mm,28 d最大抗折、抗压强度分别为25.8 MPa、135.6 MPa的机制砂UHPC;机制砂、钢纤维与水泥石基体结合紧密,且钢纤维在水泥石基体中均匀分布,使UHPC试件具有优异的力学性能。
Abstract: In order to prepare economical ultra-high performance concrete (UHPC), the quartz sand was replaced by mechanical sand. The influence of mechanical sand fineness and its gradation on the performance of UHPC was studied under standard curing. Additionally, the high strength mechanism was further clarified through SEM micro-morphology analysis. The results show that the working performance and mechanical properties of the UHPC samples can be significantly improved with reasonable gradation of mechanical sand. The UHPC samples with an expansion of 680 mm and the 28 d maximum flexural strength and compressive strength of 25.8 MPa and 135.6 MPa can be prepared by mixing mechanical sand. The reason is that mechanical sand and steel fibers are tightly combined with the cement paste matrix, and the steel fibers are uniformly distributed in the cement paste matrix. The uniform and dense structure makes the samples have excellent properties.
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