【摘要】 疏浚泥含水率高、压缩性大、工程利用困难。基于半干法压制成型方法，以疏浚泥替代普通砂石料、以矿粉为基材常温碱激发制备低碳地聚合物胶凝材料替代普通高能耗水泥制备生态块体，进行了疏浚泥块体密度、凝结时间，抗压和破裂抗压强度和抗水侵蚀性能试验研究。结果表明随着Na₂O掺量增加，试件的力学性能有显著改善，适量的Si-O四面体基团可以促进原料的缩聚反应，而过度聚合会阻碍材料的解聚和聚合过程。水玻璃模数为1.0、掺量5%时，试件28 d抗压和劈裂抗拉强度分别为31.3 MPa和3.0 MPa。试件的初凝和终凝时间与Na₂O含量和水玻璃模数呈负相关；疏浚泥块体具有较好的抗水侵蚀性，压制成型疏浚泥块体定期洒水养护和标准养护的软化系数分别达到了0.92和0.94。与普通C30混凝土相比，矿粉基地聚合物疏浚泥块体较之普通混凝土成本降低20%以上。可以降低碳排放，实现多废利用，具有良好的生态和社会效益。更多还原

【Abstract】 Dredging silt has high moisture content, high compressibility, and difficult engineering utilization. Based on the semi dry pressing method, low-carbon geopolymer cementitious materials were prepared using dredging silt instead of ordinary sand and gravel materials, and mineral powder as the substrate to replace ordinary high-energy consumption cement in the preparation of ecological blocks. Experimental studies were conducted on the density, setting time, compressive and fracture compressive strength, and water erosion resistance of dredging silt blocks. The results show that with the increase of Na₂O content, the mechanical properties of the specimens are significantly improved. An appropriate amount of Si-O tetrahedral groups can promote the condensation reaction of the raw materials, while excessive polymerization will hinder the depolymerization and polymerization process of the materials. When the water glass modulus is 1.0 and the dosage is 5%, the 28 day compressive and splitting tensile strengths of the specimen are 31.3 MPa and 3.0 MPa, respectively. The initial and final setting times of the specimen are negatively correlated with the Na₂O content and water glass modulus; The dredging silt blocks have good resistance to water erosion, and the softening coefficients of the compacted dredging silt blocks after regular watering and standard curing have reached 0.92 and 0.94, respectively. Compared with ordinary C30 concrete, the cost of mineral powder geopolymer dredging silt blocks is reduced by more than 20%. It can reduce carbon emissions, achieve multi waste utilization,and have notable ecological and social benefits.更多还原