Properties and Microstructure of Cement Solidified Incineration Fly Ash-Cement Composites Cementitious Material

doi:10.16552/j.cnki.issn1001-1625.2025.0208

Abstract

Abstract: Cement solidified incineration fly ash (CSFA) has a large landfill volume and causes pollution to the environment, but it has a high calcium content and potential volcanic ash activity, which can be used to prepare cementitious materials. In this paper, using detoxified cement solidified incineration fly ash (DCSFA) as raw materials, the physical and chemical characteristics, mechanical properties and microstructure of the hardened slurry of detoxified cement solidified incineration fly ash-cement composite cementitious materials (C-DCSFA) were studied. The results show that the mechanical properties of the C-DCSFA with a 10% (mass fraction, the same below) dosage of DCSFA are better than cement group at 7 and 28 d, and the highest compressive strength at 28 d can reach 53.4 MPa. The addition of 10% DCSFA results in lower early performance of the composite cementitious material compared to the cement group after 3 d, slower early hydration process, and lower cumulative heat release. As the reaction progresses, the composite cementitious material exhibits alternating growth of hydration products and tight connections at 28 d, resulting in a significant increase in its compressive strength.

Key words: cement solidified incineration fly ash, composite cementitious material, mechanical property, hydration product, microstructure, hydration heat flow

CLC Number:

TU526

LIU Jiayu, GAO Yu, LIU Ze, WEN Shuaiyun, WANG Dongmin, WEI Peng, ZHANG Chunhui, ZHU Zhengjiang, LI Qingya. Properties and Microstructure of Cement Solidified Incineration Fly Ash-Cement Composites Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3272-3279.

References

[1] 徐慧, 张婷. 垃圾土的力学性能影响因素分析及工程应用研究[J]. 轻工科技, 2024, 40(3): 123-128.
XU H, ZHANG T. Analysis of influencing factors on mechanical properties of garbage soil and its engineering application[J]. Light Industry Science and Technology, 2024, 40(3): 123-128 (in Chinese).
[2] LUO H W, HE D Q, ZHU W P, et al. Humic acid-induced formation of tobermorite upon hydrothermal treatment with municipal solid waste incineration bottom ash and its application for efficient removal of Cu(II) ions[J]. Waste Management, 2019, 84: 83-90.
[3] LI Y H, PENG X, LI D W, et al. The environmental toxicity of heavy metals in municipal solid waste incineration fly ash[J]. Applied Mechanics and Materials, 2011, 71: 4760-4764.
[4] KLAUS W. 德国生活垃圾处理技术发展[J]. 环境卫生工程, 2004, 12(4): 200-201+205.
KLAUS W. Development of domestic waste treatment technology in Germany[J]. Environmental Sanitation Engineering, 2004, 12(4): 200-201+205 (in Chinese).
[5] TSUNEMATSU M, OSHITA K, KAWAI T, et al. Behaviors and emission inventories of microplastics from various municipal solid waste incinerators in Japan[J]. Journal of Material Cycles and Waste Management, 2024, 26(2): 692-707.
[6] FAN C C, WANG B M, ZHANG T T. Review on cement stabilization/solidification of municipal solid waste incineration fly ash[J]. Advances in Materials Science and Engineering, 2018, 2018(1): 5120649.
[7] DU B, LI J T, FANG W, et al. Characterization of naturally aged cement-solidified MSWI fly ash[J]. Waste Management, 2018, 80: 101-111.
[8] LI J T, ZENG M, JI W X. Characteristics of the cement-solidified municipal solid waste incineration fly ash[J]. Environmental Science and Pollution Research International, 2018, 25(36): 36736-36744.
[9] MAO Y P, WU H, WANG W L, et al. Pretreatment of municipal solid waste incineration fly ash and preparation of solid waste source sulphoaluminate cementitious material[J]. Journal of Hazardous Materials, 2020, 385: 121580.
[10] TONG L Z, TANG Y, WANG F, et al. Investigation of controlling factors on toxic metal leaching behavior in municipal solid wastes incineration fly ash[J]. Environmental Science and Pollution Research, 2019, 26(28): 29316-29326.
[11] TABYANG W, SUKSIRIPATTANAPONG C, PHETCHUAY C, et al. Evaluation of municipal solid waste incineration fly ash based geopolymer for stabilised recycled concrete aggregate as road material[J]. Road Materials and Pavement Design, 2022, 23(9): 2178-2189.
[12] LIN K L, WANG K S, TZENG B Y, et al. The reuse of municipal solid waste incinerator fly ash slag as a cement substitute[J]. Resources, Conservation and Recycling, 2003, 39(4): 315-324.
[13] XIE X, LIU X Y, LYU Y Y, et al. Hydration characteristic and strengthening mechanism of municipal solid waste incineration fly ash cementitious composites modified by nano SiO₂[J]. Construction and Building Materials, 2023, 409: 134004.
[14] WI K, SAHIN O, WANG K J, et al. Characterization and evaluation of cement-based systems containing solution-treated municipal solid-waste incineration fly ash[J]. Construction and Building Materials, 2024, 416: 135230.
[15] PAN S P, DING J M, PENG Y Q, et al. Investigation of mechanochemically treated municipal solid waste incineration fly ash as replacement for cement[J]. Energies, 2022, 15(6): 2013.
[16] BIE R S, CHEN P, SONG X F, et al. Characteristics of municipal solid waste incineration fly ash with cement solidification treatment[J]. Journal of the Energy Institute, 2016, 89(4): 704-712.
[17] 吉奥固化(上海)新材料有限公司. 一种飞灰的处理方法: 中国, CN115138668B[P]. 2023-05-12.
GIO CURING (SHANGHAI) NEW MATERIALS Co., Ltd. A method for handling fly ash: China, CN115138668B[P]. 2023-05-12 (in Chinese).
[18] GAO Y, LIU F L, LIU Z, et al. Preparation and characterization of cementitious materials from dedioxinized and dechlorinated municipal solid waste incineration fly ash and blast furnace slag[J]. Construction and Building Materials, 2024, 432: 136643.
[19] 肖振华, 丁志伟, 周琛洋, 等. 抗高温低密度水泥浆体系研究与应用[J]. 当代化工研究, 2024(7): 108-110.
XIAO Z H, DING Z W, ZHOU C Y, et al. Research and application of high temperature resistant low density cement slurry system[J]. Modern Chemical Research, 2024(7): 108-110 (in Chinese).