Solidification of Sand Washing Residue Mud byUsing Multivariant Solid Waste Cementitious Materials at 20 and 40 ℃

doi:10.16552/j.cnki.issn1001-1625.2024.1094

Abstract

Abstract: This study used granulated blast furnace slag, steel slag, red mud, calcined gypsum and a small amount of self-synthesized activator CH (made by mixing multiple valence states of alkali) and NS (made by mixing various soluble sulfates and halogen salts) to prepare multivariate solid waste cementitious materials (MSWCM) to solidify sand washing residue mud. The effects of chemical activator type, cementitious material content and curing temperature (20 and 40 ℃) on the compressive strength and microstructure of the solidified body of sand washing residue mud were studied by XRD, MIP and SEM. The water stability and heavy metal leaching characteristics were evaluated. The results show that the MSWCM with addition of CH has the best curing effect on the sand washing residue mud. When the curing temperature and the content of MSWCM are 40 ℃ and 40%, the 7 d compressive strength can reach 5.57 MPa, and the softening coefficient is 0.88. The solidification effect of sand washing residue mud is the worst for MSWCM with addition of NS, because of the lack of a high alkaline environment, which weakens the leaching of calcium and aluminum, reducing the generation of C-S-H and ettringite, and has a high porosity. The use of MSWCM with addition of CH-NS reduces the compressive strength of sample due to the formation of excessive expansion product AFt. By increasing the content of MSWCM and curing temperature, the compressive strength of solidified body of sand washing residue mud increases. The 7 d compressive strength of solidified body of sand washing residue mud at 40 ℃ can be increased by 169.08% compared with the 7 d compressive strength at 20 ℃ by MSWCM with addition of CH. In addition, the leaching content of heavy metals (iron, manganese, titanium) in the solidified body of sand washing residue mud meets the environmental protection requirements.

Key words: solid waste cementitious material, sand washing residue mud, curing temperature, compressive strength, water stability, heavy metal leaching

CLC Number:

TU526

GAO Yunnan, ZHANG Lingshuai, HOU Li, ZHOU Yongxiang. Solidification of Sand Washing Residue Mud byUsing Multivariant Solid Waste Cementitious Materials at 20 and 40 ℃[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(2): 590-601.

References

[1] 李思文, 王毅, 李师. 国外余泥渣土的处置方法及其借鉴作用[J]. 中国土地, 2020(12): 44-46.
LI S W, WANG Y, LI S. Disposal methods of foreign residual mud and dregs and their reference[J]. China Land, 2020(12): 44-46 (in Chinese).
[2] 李丹, 孙占琦, 苏颖, 等. 深圳市余泥渣土现状及策略分析[J]. 施工技术, 2018, 47(增刊3): 129-131.
LI D, SUN Z Q, SU Y, et al. Current situation and strategy analysis of residual sludge in Shenzhen[J]. Construction Technology, 2018, 47(supplement 3): 129-131 (in Chinese).
[3] 孙佳诚. 免烧结余泥骨料的制备及性能试验研究[D]. 青岛: 青岛理工大学, 2023.
SUN J C. Experimental study on the preparation and performance ofsinter-free residual clayaggregates[D]. Qingdao: Qingdao University of Technology, 2023 (in Chinese).
[4] 孙佳诚, 朱亚光, 徐培蓁, 等. 水泥基固化剂对余泥的固化效果研究[J]. 青岛理工大学学报, 2024, 45(3): 27-34.
SUN J C, ZHU Y G, XU P Z, et al. Study on the curing effect of cement-based curing agent on residual mud[J]. Journal of Qingdao University of Technology, 2024, 45(3): 27-34 (in Chinese).
[5] 李晨, 张正甫, 刘松玉, 等. 水泥石灰固化软土中的钙矾石形成研究[J]. 岩土工程学报, 2013, 35(增刊2): 662-665.
LI C, ZHANG Z F, LIU S Y, et al. Study on ettringite formation in soft soil solidified by cement lime[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(supplement 2): 662-665 (in Chinese).
[6] 杨君健, 兰明章, 王剑锋, 等. 多元固废基胶凝材料水化性能研究[J]. 新型建筑材料, 2022, 49(10): 107-113.
YANG J J, LAN M Z, WANG J F, et al. Research on hydration properties of multiple solid waste-based cementitious materials[J]. New Building Materials, 2022, 49(10): 107-113 (in Chinese).
[7] 周丽波, 陈平, 胡成, 等. 钢渣-赤泥-水泥基复合砂浆的水化硬化特性[J]. 硅酸盐通报, 2023, 42(8): 2837-2845.
ZHOU L B, CHEN P, HU C, et al. Hydration hardening characteristics of steel slag-red mud-cement based composite mortar[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(8): 2837-2845 (in Chinese).
[8] 刘倩, 周永祥, 王祖琦, 等. 稻壳灰-脱硫灰-钢渣复合胶凝材料的制备及在固化土中的应用[J]. 建筑科学, 2022, 38(7): 72-77.
LIU Q, ZHOU Y X, WANG Z Q, et al. Preparation of rice husk ash-desulfurization ash-steel slag composite cementitious material and its application in solidified soil[J]. Building Science, 2022, 38(7): 72-77 (in Chinese).
[9] CUI S H, FAN K J, YAO Y. Preparation and characterization of quaternary clinker-free cementitious materials containing phosphorus slag, calcium carbide slag, desulfurization gypsum, and metakaolin[J]. Construction and Building Materials, 2024, 411: 134602.
[10] 董泽, 赵宇宏, 张国永, 等. 工业废渣基固化剂固化工程渣土的试验研究及工程应用[J]. 上海建设科技, 2023(1): 74-76+83.
DONG Z, ZHAO Y H, ZHANG G Y, et al. Experimental research and engineering application of industrial waste residue-based curing agent for solidify engineering residue[J]. Shanghai Construction Science & Technology, 2023(1): 74-76+83 (in Chinese).
[11] 陈哲宁. 建筑废弃物再生冗余土制备预拌流态固化土及性能研究[J]. 水泥工程, 2022(5): 63-68.
CHEN Z N. Preparation and performance of ready-mixed fluidic solidified soil by using construction waste recycled redundant soil[J]. Cement Engineering, 2022(5): 63-68 (in Chinese).
[12] 王旭影, 乔京生, 赵建业, 等. 电石渣激发钢渣-矿渣固化淤泥质土的试验研究[J]. 硅酸盐通报, 2022, 41(2): 733-739.
WANG X Y, QIAO J S, ZHAO J Y, et al. Solidification of muddy soil with steel slag and ground granulated blast-furnace slag activated by calcium carbide slag[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 733-739 (in Chinese).
[13] 厉帅康, 俞峰, 陈鑫, 等. 水泥-矿渣基早强固化剂制备及固化土宏微观性能研究[J]. 硅酸盐通报, 2023, 42(11): 3964-3977+4005.
LI S K, YU F, CHEN X, et al. Preparation of cement-slag based early strength curing agent and macro and micro properties of solidified soil[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(11): 3964-3977+4005 (in Chinese).
[14] 张学林. 基于最优混料设计的洗砂余泥基低碳胶凝材料配合比优化[J]. 信息记录材料, 2023, 24(12): 41-43+46.
ZHANG X L. Optimization of mix proportion of low-carbon cementitious material based on sand washing residue based on optimal mix design[J]. Information Recording Materials, 2023, 24(12): 41-43+46 (in Chinese).
[15] LI Y, LIU X M, LI Z P, et al. Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials[J]. Journal of Cleaner Production, 2021, 284: 124777.
[16] XU J Q, CHEN P. Synergistic effect of iron tailings, steel slag and red mud cementitious materials on mechanical and microstructure properties[J]. Journal of Building Engineering, 2024, 95: 110131.
[17] 朱增超, 刘贤平, 水中和, 等. 固废基复合胶凝材料配比优化设计及协同效应研究[J]. 硅酸盐通报, 2023, 42(12): 4368-4377+4388.
ZHU Z C, LIU X P, SHUI Z H, et al. Mix ratio optimization design and synergistic effect study of multi-source solid waste binders[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(12): 4368-4377+4388 (in Chinese).
[18] 周永祥, 刘倩, 王祖琦, 等. 流态固化土用无熟料胶凝材料的性能研究[J]. 硅酸盐通报, 2022, 41(10): 3548-3555.
ZHOU Y X, LIU Q, WANG Z Q, et al. Properties of cementitious materials without clinker for fluid solidified soil[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(10): 3548-3555 (in Chinese).
[19] HAO X S, LIU X M, ZHANG Z Q, et al. In-depth insight into the cementitious synergistic effect of steel slag and red mud on the properties of composite cementitious materials[J]. Journal of Building Engineering, 2022, 52: 104449.
[20] BIN L, ZHANG Q L, FENG Y, et al. Mechanical and microstructural analysis of cemented tailings backfill by copper slag through alkaline activation emphasizing red mud[J]. Construction and Building Materials, 2024, 428: 136341.
[21] 崔孝炜, 倪文, 狄燕清. 钢渣矿渣基全固废胶凝材料的化学活化[J]. 硅酸盐通报, 2018, 37(4): 1411-1417.
CUI X W, NI W, DI Y Q. Chemical activation of cementitious materials with all solid waste based of steel slag and blast furnace slag[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(4): 1411-1417 (in Chinese).