煤化工高盐废水拌合水泥制备生态胶凝材料的性能

针对目前处理高盐废水成本较高且处理不彻底等问题，采用掺入高盐废水拌合水泥制备生态胶凝材料的方法，以达处理和利用高盐废水的目的。同时，探究了不同养护温度下不同掺量高盐废水拌合水泥制备的生态胶凝材料的相关性能。结果表明，高盐废水的掺入可以有效促进水泥拌和过程中C-S-H凝胶和Friedel’s盐、钙钒石的生成，进而优化试样内部的孔隙结构。这不仅有利于胶凝材料强度的发展，而且可以减少危害物的浸出。在常温养护条件下，掺入50%高盐废水拌合水泥制备的生态胶凝材料的28 d抗压强度可以达到55.5 MPa，且对重金属元素的固化率可以达到50%以上。本研究结果可为煤化工高盐废水拌合水泥制备生态胶凝材料提供参考。

Properties of eco-cementitious materials prepared by mixing cement with high-salt wastewater from coal chemical industry

In order to solve current defects of high-concentration salt-containing methods such as high cost and incomplete treatment, this research dealt with the wastewater and made use of it by mixing the wastewater with cement to produce ecological cementitious materials. The related properties of ecological cementitious materials prepared by mixing cement with different dosages of high-concentration salt-containing wastewater at different curing temperatures were analyzed and studied by means of electric pressure tester, X-ray diffraction, scanning electron microscope, and synchronous thermal analysis. The results showed that the incorporation of high-concentration salt-containing wastewater can effectively promote the formation of C-S-H gel, Friedel’s salt and AFt in the cement mixing process, and further optimize the pore structure of the sample, which was not only conducive to the development of the strength of the cementitious materials, but also could reduce the leaching of harmful substances. The 28 d compressive strength of the ecological cementitious materials prepared by mixing 50% high-concentration salt-containing wastewater with cement under room temperature curing could reach 55.5 MPa, and the curing rate of heavy metal elements could reach more than 50%. This research provides a reference for future use of high-concentration salt-containing wastewater.