水工砂性弃土固化材料力学性能研究

摘要

Using waste sandy soil as raw material, the solidified materials were studied to use in hydraulic engi⁃neering in this paper. The influence of inorganic binder such as cement, gypsum and slag on the performance of the solidified materials was studied by testing the compressive strength, tensile splitting strength and water stability of specimens. The study results show that the optimal proportion of this solidified material is that discarded clay soil:cement:slag:gypsum=70%:18%:10%:2%. With this proportion, the compressive strength, tensile splitting strength and immersion strength of specimens at 28 days are 24.7 MPa, 2.3 MPa and 23.2 MPa separately. This solidified material meets the application requirements of hydraulic engineering. It can be attempted to make the ballast block and use in channel engineering.%采用航道整治砂性弃土为主要原料制备水工材料，以抗压强度、劈裂抗拉强度及水稳定性作为控制指标，研究水泥、矿粉和石膏掺量对固化材料28 d力学性能影响。结果表明：在砂性弃土用量为70%，水泥、矿粉及石膏掺量分别为18%、10%和2%时，可获得28d抗压强度、劈裂抗拉强度和浸水强度分别达24.7 MPa、2.3 MPa和23.2 MPa的固化材料。该材料具有较高的抗压、抗拉力学强度及良好的水稳定性能，干缩率和吸水率小，与普通C20混凝土相比，砂性弃土固化材料综合单价降低约8.0%，可替代普通混凝土制作压载块等水工材料就地应用于水利和航道整治工程中，具有良好经济和社会效益。