MSWI飞灰制阿利尼特复合水泥基材料的耐久性

Durability of Composite Alinite Cement-based Materials from Municipal Solid Waste Incineration(MSWI) Fly Ash

以垃圾焚烧(MSWI)飞灰为主要原料,在实验室成功烧制了阿利尼特水泥熟料,基于此试验研究复合阿利尼特水泥基材料的耐久性。试样优选配比为阿利尼特水泥熟料:石膏:混合材(MSWI飞灰/粉煤灰/矿渣粉)=80%:5%:15%。结果表明:掺入混合材可增强阿利尼特水泥基材料的强抗硫酸盐侵蚀能力;不同混合材的掺入还可改善阿利尼特水泥基材料的抗渗性和抗碳化性能,改善幅度为试样AD3(掺15%矿渣粉)>AB3(掺15%MSWI飞灰)>AC3(掺15%粉煤灰);混合材的掺入对干缩性有负面影响。掺加15%MSWI飞灰的试样AB3,随着水化龄期增长,氯离子的溶出量呈降低趋势,且长龄期后溶出量渐趋稳定。

Municipal solid waste incineration （MSWI） fly ash was successfully used as a main raw material in sintering and preparing alinite cement clinker in laboratory. Based on this, this work was focused on the durability composite alinite cement-based materials .The optimum mix mass ratio was that Alinite cement clinker： Gypsum： Cement additives （MSWI fly ash/fly ash/slag） = 80%： 5%：15%. The experimental results showed that addition of cement additives could improve the resistance to sulfate attack of this alinite cement-based materials.The resistance to carbonation and water permeability could be improved by adding different type of cement additive. The effectiveness is specimen AD3 （with 15wt% slag） 〉 AB3 （with 15wt% MSWI fly ash） 〉 AC3 （with 15wt% fly ash）. However, the addition of cement additives had negative effects on the dry shrinkage. Additionally, with the hydration ages increasing, the content of soluble chloride ion from alinite cement specimen AB3 was decreased. It would be stable in long term.