电解锰渣-生活垃圾焚烧底渣协同制备路面基层材料试验研究

摘要/Abstract

摘要： 我国电解锰渣和城市生活垃圾焚烧底渣堆存量大,污染严重,亟需开发经济可行的资源化利用技术。采用电解锰渣和城市生活垃圾焚烧底渣制备一种路面基层材料(RBM),并研究以不同Ca/Si比(质量比)制备的RBM的化学组成、力学性能、耐久性、浸出特性、水化产物和孔隙结构。采用X 射线衍射(XRD)、热重分析(TG)、扫描电子显微镜-能谱(SEM-EDX)和压汞等表征手段研究RBM的水化产物及微观结构,利用浸出试验研究RBM的浸出特性。结果表明,当Ca/Si为0.8时,RBM力学性能和孔隙结构最优,养护7 d后的无侧限抗压强度(UCS)达9.06 MPa,满足中国水泥土路面基层I级标准。RBM耐久性优异,养护28 d的RBM经过9次冻融循环和干湿循环试验后,UCS分别为11.63、9.90 MPa。RBM中的主要水化产物为CaAl₂Si₂O₈·4H₂O、3CaO·Al₂O₃(C₃A)、2CaO·SiO₂(C₂S)和CaMnSi₄O₈,水化产物相互交错填充孔隙提高了RBM的强度及耐久性。RBM中重金属和氨氮浸出浓度符合中国地下水标准。该研究可在实现电解锰渣和城市生活垃圾焚烧底渣大规模利用的同时节约路面基层材料成本。

关键词: 电解锰渣, 城市生活垃圾焚烧底渣, 路面基层材料, 无侧限抗压强度, 耐久性, 浸出特性, 水化产物

Abstract: There is a large stock and serious pollution of electrolytic manganese residue and municipal solid waste incineration bottom ash in our country, and it is urgent to develop economically and technically feasible resource utilization technologies. Electrolytic manganese residue and municipal solid waste incineration bottom ash were used to prepare a road base material (RBM), and the chemical composition, mechanical properties, durability, leaching characteristics, hydration products, and pore structure of RBM with different Ca/Si ratios (mass ratio) were studied. The hydration products and microstructure of RBM were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscope-energy dispersive spectrometer (SEM-EDX), and mercury intrusion porosimetry methods. The leaching characteristics of RBM were studied by leaching test. The results show that when the Ca/Si ratio is 0.8, the mechanical properties and pore structure of RBM are optimal, and the unconfined compressive strength (UCS) reaches 9.06 MPa after curing for 7 d, which meets the Class I standard of cement soil road base in China. The 28 d UCS of RBM after 9 freezing-thawing cycles and drying-wetting cycles is 11.63 and 9.90 MPa, respectively. The main hydration products in RBM are CaAl₂Si₂O₈·4H₂O, 3CaO·Al₂O₃(C₃A), 2CaO·SiO₂(C₂S), and CaMnSi₄O₈. The strength and durability of RBM are improved by the interlacing of hydration products. The leaching concentrations of heavy metals and ammonia nitrogen in RBM meet the Chinese groundwater standard. This study can save the cost of road base materials while realizing the large-scale utilization of electrolytic manganese residue and municipal solid waste incineration bottom ash.

Key words: electrolytic manganese residue, municipal solid waste incineration bottom ash, road base material, unconfined compressive strength, durability, leaching characteristic, hydration product

中图分类号:

TU521

张先伟, 高永红, 王平, 李江山, 刘世宇, 郎雷, 雷学文. 电解锰渣-生活垃圾焚烧底渣协同制备路面基层材料试验研究[J]. 硅酸盐通报, 2023, 42(4): 1363-1373.

ZHANG Xianwei, GAO Yonghong, WANG Ping, LI Jiangshan, LIU Shiyu, LANG Lei, LEI Xuewen. Experimental Research on Synergistic Preparation of Road Base Material by Electrolytic Manganese Residue-Municipal Solid Waste Incineration Bottom Ash[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1363-1373.

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