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采用水泥基复合注浆材料对有色金属矿区重金属污染土进行防渗隔离处理。水泥、粉煤灰和矿渣等主要材料分别以不同组分与水玻璃混合形成3种复合注浆材料。采用倒杯法试验、无侧限抗压强度试验等方法研究不同水玻璃掺量、波美度以及粉煤灰和矿渣掺量对复合注浆材料凝胶时间和抗压强度等力学性能的影响规律。此外,采用XRD和SEM等测试方法,从材料的物相组成及微观结构方面进一步分析了复合注浆材料的力学特性。研究结果表明:凝胶时间随着水玻璃掺量和波美度的增大而延长;粉煤灰可以显著延长凝胶时间,但使用矿渣代替部分粉煤灰会使凝胶时间略有减少。当水玻璃掺量在20%以下时,复合注浆材料抗压强度随着水玻璃掺量的增加而增加,当水玻璃掺量超过20%,抗压强度显著降低;抗压强度随波美度的增加而增大;粉煤灰和矿渣可提高复合注浆材料的抗压强度。
Using cement-based composite grouting material for non-ferrous metal mining area of heavy metal contaminated soil seepage isolation treatment. The main materials of cement, fly ash and slag are mixed with water glass to form three kinds of composite grouting materials with different components respectively. The influence of different water glass content, Baume degree, fly ash and slag dosage on the mechanical properties such as gel time and compressive strength of composite grouting material were investigated by the method of pouring cup test and unconfined compressive strength test law. In addition, the mechanical properties of the composite grouting material were further analyzed from the phase composition and microstructure of the material by XRD and SEM. The results show that the gel time prolongs with the increase of sodium silicate content and the Baume degree; fly ash can significantly prolong the gel time, but the use of slag instead of part of the fly ash will reduce the gel time slightly. When the content of water glass is less than 20%, the compressive strength of composite grouting material increases with the increase of water glass content. When the content of water glass exceeds 20%, the compressive strength decreases remarkably; Degree of increase and increase; fly ash and slag can improve the compressive strength of composite grouting material.