Mechanical and Environmental Performance of Chemical Pretreated Incineration Bottom Ash as a Supplementary Cementitious Material
Xiaoyan Wei, Jiaze Wang, Yanlin Zhang, Mingxuan Wu, Jie Yang, Tao Meng, Su Wang, Zhen Shyong Yap, Yinjie Huang, Wu Zhou, Yanfang Wu
TL;DR
This study explores how chemical treatments can improve the use of incineration bottom ash as a cement substitute, finding that calcium hydroxide is the most effective and sustainable option.
Contribution
The study introduces a systematic evaluation of chemical pretreatments for enhancing the reactivity and sustainability of incineration bottom ash in cementitious systems.
Findings
Calcium hydroxide (Ca(OH)2) pretreatment significantly improves the strength and microstructure of incineration bottom ash.
Sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) treatments lead to reduced strength due to porosity and carbonation issues.
Ca(OH)2 offers a balanced approach with strong activation and moderate carbon emissions.
Abstract
Municipal solid waste incineration bottom ash (IBA), a major by-product of waste-to-energy plants, is typically landfilled or utilized as low-grade aggregate due to its low intrinsic reactivity and complex composition. This study systematically investigates the efficacy of chemical pretreatment in enhancing the cementitious behavior of IBA, specifically examining the effects of alkali type (Ca(OH)2, NaOH, and Na2CO3) and pretreatment duration on reactivity, microstructure, and mechanical performance. The results indicate that Ca(OH)2 activation provides the most significant enhancement; a one-day treatment yielded a 28-day strength activity index (H28) of 76% and facilitated the formation of a compact microstructure rich in ettringite (AFt) and C-S-H gels. Conversely, NaOH and Na2CO3 treatments were less effective, leading to increased porosity and reduced strength attributed to charge…
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Taxonomy
TopicsRecycling and utilization of industrial and municipal waste in materials production · Concrete and Cement Materials Research · Recycled Aggregate Concrete Performance