The utilization of waste incineration filter dust (WIFD) in sodium carbonate activated slag mortars
The utilization of waste incineration filter dust (WIFD) in sodium carbonate activated slag mortars
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DOI：
10.1016/j.conbuildmat.2021.125494
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发表时间：
2021-11-09
影响因子：
7.4
通讯作者：
Brouwers, H. J. H.
中科院分区：
文献类型：
--
作者：
Ling, Xuan;Schollbach, Katrin;Brouwers, H. J. H.
提出的工作利用垃圾焚烧过滤器粉尘（WIFD）作为绿色成分在碳酸钠活化的磨粒高炉渣（GGBFS）系统。城市生活垃圾焚烧厂生产的废铁含有大量的硅酸盐和方解石。通过等温量热法、x射线衍射（XRD）、热重分析（TG-DTG）、FT-IR、SEM/BSE/EDX、BET等测试对体系的反应动力学和反应产物进行了分析。对混合试样的流动性和抗压强度进行了评价。结果表明，wid和Na2CO3对GGBFS的活化具有协同作用。产自wid的波特兰铁矿可以取代纯Ca(OH)(2)，并与Na2CO3反应，提高碱度。wid的掺入加速了Na2CO3活化的GGBFS，其主要产物包括C-(A)- s - h凝胶、水滑石和半碳酸氢盐。此外，wid的方解石有利于半碳酸盐的形成，降低了基体的孔隙度。虽然试样的力学性能随着wid的增加而降低，但它仍然足够高，可以在强度要求较低的建筑中应用。结果还证实了GGBFS可以被wid激活，碳酸钠的加入有助于强度的发展和反应速度的提高。这项工作显示了wid作为绿色建筑材料的应用潜力。
The presented work utilizes Waste Incineration Filter Dust (WIFD) as a green ingredient in a sodium carbonate activated ground granulated blast furnace slag (GGBFS) system. WIFD is produced with a high portlandite and calcite content in MSWI incineration plants. The reaction kinetics and reaction products of the system are analyzed through isothermal calorimetry, X-Ray diffraction (XRD), thermogravimetric analysis (TG-DTG), FT-IR, SEM/BSE/EDX, BET tests. The flowability and compressive strength of WIFD mixed samples are evaluated. The results show that the WIFD and Na2CO3 have a synergistic effect on the activation of GGBFS. The portlandite from WIFD could replace the pure Ca(OH)(2) and react with Na2CO3 to improve the alkalinity. The incorporation of WIFD accelerates the Na2CO3 activated GGBFS with the main products, including C-(A)-S-H gel, hydrotalcite and hemicarbonate. Besides, the calcite from WIFD is beneficial to form the hemicarbonate and decrease the porosity of the matrix. Though the mechanical performance of samples is reduced with more WIFD, it's still high enough for a potential application in construction with lower strength requirements. The results also confirm that GGBFS could be activated by WIFD along and the addition of sodium carbonate helps the strength development and increases reaction speed. The work shows the potential of WIFD applying as a green building material.