Abstract: Alkali-activated materials (AAMs) have become a key research focus in the field of novel building materials due to their low carbon emissions and excellent mechanical properties. In this study, diatomite and bauxite were used as raw materials to systematically investigate the effect of different calcination temperatures on the activation of diatomite, as well as the impact of various diatomite content, water-to-binder ratio, alkali equivalent, and activator modulus on the mechanical properties and microstructure of alkali-activated diatomite/bauxite cementitious materials. The results indicate that diatomite exhibited optimal pozzolanic activity after calcination at 600 ℃ for 2 h. In the alkali-activated system, the mate-rial shows the highest compressive and flexural strength when the diatomite-to-bauxite ratio is 4∶6, the water-to-binder ratio is 0.4, the alkali equivalent is 6%, and the activator modulus is 1.0. The orthogonal test analysis reveals that the mechanical strength of the cementitious materials decreases with the increase of water-to-binder ratio and follows a trend of first increase and then decrease with diatomite content, alkali equivalent, and modulus. XRD and SEM analyses demonstrate that the crystallinity of mullite and N-A-S-H gel in the material is high, significantly enhancing the matrix’s density, reducing crack formation, and improving the mechanical properties of the material. These findings provide theoretical support for the development and application of alkali-activated diatomite/bauxite cementitious materials.
1 Wang H L, Li J H, Hou L, et al. Bulletin of the Chinese Ceramic Society, 2011, 30(1), 19(in Chinese). 王浩林, 李金洪, 侯磊, 等. 硅酸盐通报, 2011, 30(1), 19. 2 Pang B, Xiao L G. Bulletin of the Chinese Ceramic Society, 2017, 36(8), 2781(in Chinese). 庞博, 肖力光. 硅酸盐通报, 2017, 36(8), 2781. 3 Zheng R J, Ren Z J, Gao H M, et al. Journal of Alloys and Compounds, 2018, 757, 364. 4 Garderen N V, Clemens F J, Mezzomo M, et al. Applied Clay Science, 2011, 52(2), 115. 5 Huang Z H, Guo H Z, Pu H L, et al. Acta Mineralogica Sinica, 2022, 42 (5), 631(in Chinese). 黄志浩, 郭浩喆, 卜红玲, 等. 矿物学报, 2022, 42 (5), 631. 6 Hassan H S, Abdel-Gawwad H A, Vasquez-García S R, et al. Journal of Cleaner Production, 2019, 209, 1420. 7 Liu Z Y. Study on preparation and hydration mechanism of cementitious materials from diatomite and steel slag. Ph. D. Thesis, Hebei University of Engineering, China, 2019(in Chinese). 刘振宇. 硅藻土—钢渣基复合胶凝材料的制备及机理研究. 博士学位论文, 河北工程大学, 2019. 8 Arbin K, Palomo A, Fernández-Jiménez A. Ceramics International, 2013, 39, 9237. 9 Liang G W, Yao W. Construction and Building Materials, 2023, 376, 131026. 10 Elshimy A S, AbdelGawwad H A, Abu Sharib A A A. et al. Journal of Environmental Chemical Engineering, 2023, 11, 110392. 11 Gou M F, Huang F, Wang S J, et al. Materials Reports, 2015, 29(18), 100(in Chinese). 勾密峰, 黄飞, 王思军, 等. 材料导报, 2015, 29(18), 100. 12 Ma X W, Dong E L, Zhang C, et al. Journal of Materials Science and Engineering, 2021(3), 420(in Chinese). 马先伟, 董恩来, 张程, 等. 材料科学与工程学报, 2021(3), 420. 13 Hassan H S, Shi C, Hashem F S, et al. Resources, Conservation and Recycling, 2024, 202, 107402. 14 Fu Q, Bu M, Zhang Z, et al. Engineering, 2023, 20, 162. 15 He S, Huang X, Yu P, et al. Construction and Building Materials, 2024, 419, 135515. 16 Hu Z B, Zheng S L, Li Y, et al. Journal of the Chinese Ceramics, 2019, 49(7), 1395(in Chinese). 胡志波, 郑水林, 李渝, 等. 硅酸盐学报, 2021, 49(7), 1395. 17 Mi Z C, Zhu K J. Bulletin of The Chinese Ceramic Society, 2019, 38(5), 1625(in Chinese). 米增财, 朱开金. 硅酸盐通报, 2019, 38(5), 1625. 18 Liu J, Geng Y J, Li S C, et al. Journal of Qingdao University of Technology, 2019, 41(5), 82(in Chinese). 刘珺, 耿永娟, 李绍纯, 等. 青岛理工大学学报, 2020, 41(5), 82. 19 Ruan W L. Study on preparation and properties of alkali-excited diatomaceous earth-based cementitious materials. Ph. D. Thesis, Chongqing Technology and Business University, China, 2023(in Chinese). 阮文琳. 碱激发硅藻土基胶凝材料的制备与性能研究. 博士学位论文, 重庆工商大学, 2023. 20 Cui C, Tai W Y, Sun X H, et al. New Building Materials, 2024, 51(6), 94(in Chinese). 崔潮, 邰文玉, 孙小惠, 等. 新型建筑材料, 2024, 51(6), 94. 21 Yang L. Heilongjiang Water Conservancy Science and Technology, 2024, 52(9), 23(in Chinese). 杨李. 黑龙江水利科技, 2024, 52(9), 23. 22 Zhang B W. Shandong Chemical Industry, 2023, 52(24), 46(in Chinese). 张博文. 山东化工, 2023, 52(24), 46. 23 Zhu X P, Qian C, He B, et al. Cement and Concrete Research, 2020, 135, 106114. 24 He Y J, Lu L N, Struble L J, et al. Materials and Structures, 2013, 47(1-2), 311. 25 Xu Y Q, Zhang X W, Wang G, et al. Rock and Soil Mechanics, 2023, 44(12), 3501(in Chinese). 徐倚晴, 张先伟, 王港, 等. 岩土力学, 2023, 44(12), 3501.
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2025, Vol. 39 
