【摘要】 为了利用长江航道整治工程中产生的废弃超细砂，制备新型砂性混凝土替代普通混凝土，进行了试验研究比较了矿粉和粉煤灰作为填料对砂性混凝土的抗压、抗弯力学性能和抗冲磨性能的影响。实验结果表明，随着矿粉和粉煤灰矿物填料掺量的增加，砂性混凝土的力学性能先提升后降低。当水泥掺量为300 kg/m~3时，分别掺入200kg/m~3的矿粉和150 kg/m~3的粉煤灰填料，28 d的最大抗压强度分别为36.5 MPa和30.1 MPa，劈裂抗拉强度分别为3.01 MPa和2.10 MPa，最佳抗冲磨强度分别为24.10 h/（kg/m~2）和19.50 h/（kg/m~2），制备的超细砂砂性混凝土具有良好的力学性能和抗冲磨性。以超细废砂制成的砂性混凝土可以替代普通混凝土制备护面砖等小型预制块体，就近应用于航道整治等工程，具有良好的社会和经济效益。更多还原

【Abstract】 In order to utilize the waste ultra-fine sand generated during the Yangtze River waterway regulation project to prepare a new type of sandy concrete instead of ordinary concrete. Through experimental research, the effects of slag powder(GGBS)and fly ash(FA)as fillers on the compressive, flexural, and impact wear properties of sandy concrete were compared. The experimental results indicate that with the increase of mineral filler content of GGBS and FA, the mechanical properties of the sand concrete first improve and then decline. When the cement content is 300 kg/m3, adding 200 kg/m3GGBS and 150 kg/m3FA fillers respectively, the maximum compressive strength after 28 days is 36.5 MPa and 30.1 MPa, and the splitting tensile strength is 3.01 MPa and 2.10 MPa, respectively. The optimal abrasion resistance are 24.10 h/(kg/m2) and 19.50 h/(kg/m2),respectively. The prepared ultra-fine sand concrete has good mechanical properties and impact and wear resistance. Sand concrete made from ultra-fine waste sand can replace ordinary concrete to prepare small prefabricated blocks such as protective bricks, which can be applied in nearby projects such as waterway regulation, and has good social and economic benefits.更多还原