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Application of Alkali-Activated Cementitious Materials Made of All Solid Wastes in Waterproof Curtains
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摘要: 为减缓生产水泥带来的资源和能源的高消耗和环境污染等问题,采用电石渣、矿渣制备全固废碱激发胶凝材料全替代水泥,开展旋喷桩止水帷幕施工试验,研究不同配比的全固废胶凝材料的施工性、透水性以及强度特性,并与水泥对比。结果表明:相比于水泥的施工,全固废碱激发胶凝材料在施工中须加大喷嘴直径、保持原状电石渣含水率以防止堵管的发生;施工后通过开挖基坑察验均无渗漏情况,符合设计要求,且使用全固废碱激发胶凝材料施工的旋喷桩止水帷幕渗透系数略小于水泥止水帷幕;电石渣与矿渣按照2∶1配比等量替代水泥施工的止水帷幕其强度小于水泥止水帷幕,但当电石渣与矿渣为1∶1时,全固废碱激发胶凝材料旋喷桩止水帷幕的早期强度略高于水泥止水帷幕,后期强度则远高于水泥止水帷幕。Abstract: To mitigate a series of issues accompanied by cement production such as high consumption of natural resources and energy and environmental pollution, calcium carbide residues (CCR) and ground granulated blast-furnace slag (GGBS) were designed to develop alkali-activated cementitious materials made from all solid wastes, which could totally replace cement. A test for waterproof curtains by the jet grouting method with the alkali-activated cementitious material made from all solid wastes was conducted. The workability, water permeability and strength characteristics of alkali-activated cementitious material made from all solid wastes with different proportions were studied. The test results indicated that compared with using cement, when alkali-activated cementitious materials made from all solid wastes were adopted, the nozzle diameter of jet grouting machines should be increased and the water content of undisturbed CCR should be maintained to keep the pipeline unblocked during construction. Excavation inspection after jet grouting found that there was no leakage on the curtain and the curtain met the design requirements, and the permeability coefficient of the waterproof curtain made from alkali-activated cementitious materials was slightly smaller than that made of cement. The strength of waterproof curtains jet grouted with the alkali-activated cementitious material made from calcium carbide residues and ground granulated blast-furnace slag in the mix proportion of 1∶2 was less than jet grouted with cement. However, when the calcium carbide residue and ground granulated blast-furnace slag in the mix proportion of 1∶1, the strength of curtains at early ages was slightly higher than that jet grouted with cement, the strength was significantly higher at later ages.
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