Effect of Coal Gangue Fine Aggregate Modification Treatment onMortar Performance

doi:10.16552/j.cnki.issn1001-1625.2024.1425

Abstract

Abstract: To realize efficient resource utilization of coal gangue, the influences of modification treatments on performance of coal gangue mortar using coal gangue fine aggregate were investigated. Coal gangue fine aggregate was modified through fly ash-cement slurry encapsulation modification, CO₂ mineralization combined with fly ash-cement slurry encapsulation modification, and epoxy resin encapsulation modification methods. The aim was to study the influences of these coal gangue fine aggregate modifications on the working performance, mechanical properties, and microstructure of coal gangue mortar to elucidate their mechanisms. The results demonstrate that compared to unmodified coal gangue mortar, the modified coal gangue mortar exhibits improved water absorption, mechanical properties, and microstructure. Among these modifications, epoxy resin encapsulation modification proves most effective with a 28.8% increase in compressive strength and a 32.4% increase in modulus of elasticity, while reducing water absorption by 25.3%. This can be attributed to the enhanced overall strength and reduced porosity of aggregates due to epoxy resin hardening, as well as improvements in interfacial transition zones, leading to enhanced mechanical properties.

Key words: coal gangue fine aggregate, fly ash-cement paste, epoxy resin, CO₂ mineralization, mechanical property, mortar, interfacial transition zone

CLC Number:

TD985

YI Qian, GU Jun, CHEN Weijie, XIANG Hao, GUO Zhenghao, GAO Sheng, LUO Shuqiong. Effect of Coal Gangue Fine Aggregate Modification Treatment onMortar Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2193-2200.

References

[1] 许宏图, 刘树龙, 石大庆, 等. 煤矸石-脱硫石膏-粉煤灰膏体料浆制备及性能研究[J]. 矿业研究与开发, 2024, 44(6): 156-164.
XU H T, LIU S L, SHI D Q, et al. Preparation of coal gangue-desulfurization gypsum-fly ash paste slurry and its properties[J]. Mining Research and Development, 2024, 44(6): 156-164 (in Chinese).
[2] 李雅迪. 我国煤矸石综合利用现状与展望[J]. 煤炭经济研究, 2024, 44(4): 127-133.
LI Y D. Current situation and prospects of coal gangue’s comprehensive utilization[J]. Coal Economic Research, 2024, 44(4): 127-133 (in Chinese).
[3] 程普, 李荣, 王雅, 等. 煤矸石热活化方法探索[J]. 砖瓦, 2024(5): 24-26.
CHENG P, LI R, WANG Y, et al. Study on thermal activation of coal gangue[J]. Brick-Tile, 2024(5): 24-26 (in Chinese).
[4] 贾冠华, 贾佳, 刘玮, 等. MICP增强改性煤矸石在水稳材料中应用的试验研究[J]. 公路交通科技, 2024, 41(3): 50-60.
JIA G H, JIA J, LIU W, et al. Experimental study on application of MICP modified coal gangue in cement stabilized material[J]. Journal of Highway and Transportation Research and Development, 2024, 41(3): 50-60 (in Chinese).
[5] LUO S Q, GAO S, YANG L, et al. Enhancing coal gangue aggregates with fly ash-cement slurry: synergistic effects of CO₂ mineralization on physical and mechanical properties[J]. Construction and Building Materials, 2024, 440: 137389.
[6] 刘小婷, 温久然, 王思雨, 等. 原状煤矸石骨料强化工艺研究[J]. 无机盐工业, 2020, 52(4): 65-71+78.
LIU X T, WEN J R, WANG S Y, et al. Study on strengthening technology of raw coal gangue aggregate[J]. Inorganic Chemicals Industry, 2020, 52(4): 65-71+78 (in Chinese).
[7] 姚志鑫, 穆川川, 单俊鸿, 等. 基于裹浆工艺的煤矸石混凝土性能研究[J]. 硅酸盐通报, 2023, 42(2): 587-597.
YAO Z X, MU C C, SHAN J H, et al. Performance of coal gangue concrete based on slurry wrapping technology[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(2): 587-597 (in Chinese).
[8] 高文志. 煤矸石表面处理后做混凝土骨料的研究[D]. 淮南: 安徽理工大学, 2015.
GAO W Z. Study on making concrete aggregate after surface treatment of coal gangue[D]. Huainan: Anhui University of Science & Technology, 2015 (in Chinese).
[9] ZHANG S H, CAO M Y, ZHANG K F, et al. Wrapped coal gangue aggregate enhancement ITZ and mechanical property of concrete suitable for large-scale industrial use[J]. Journal of Building Engineering, 2023, 72: 106649.
[10] 吴琼, 胡忠君, 王健仵, 等. 再生粗骨料碳化处理及其对再生混凝土性能的影响研究进展[J]. 建筑结构, 2023, 53(增刊2): 1347-1351.
WU Q, HU Z J, WANG J W, et al. Research progress of carbonization treatment of recycled coarse aggregate and its effect on properties of recycled concrete[J]. Building Structure, 2023, 53(supplement 2): 1347-1351 (in Chinese).
[11] 肖建庄, 邓琪, 段珍华, 等. 再生细骨料碳化改性及其对砂浆流变性的影响[J]. 应用基础与工程科学学报, 2024, 32(5): 1486-1495.
XIAO J Z, DENG Q, DUAN Z H, et al. Carbonation modification of recycled fine aggregate and its effect on rheological properties of mortar[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1486-1495 (in Chinese).
[12] 杨晶, 牛玺荣, 杨煜, 等. 粉煤灰基地聚物稳定土抗压强度影响因素研究[J]. 公路, 2024, 69(8): 366-373.
YANG J, NIU X R, YANG Y, et al. Study on influencing factors of compressive strength of fly ash-based polymer stabilized soil[J]. Highway, 2024, 69(8): 366-373 (in Chinese).
[13] ZHAN B J, POON C S, LIU Q, et al. Experimental study on CO₂ curing for enhancement of recycled aggregate properties[J]. Construction and Building Materials, 2014, 67: 3-7.
[14] 陈星耀. 水泥砂浆饱和碳化过程及收缩机理研究[D]. 哈尔滨: 哈尔滨工业大学, 2021.
CHEN X Y. Study on saturated carbonation process and shrinkage mechanism of cement mortar[D]. Harbin: Harbin Institute of Technology, 2021 (in Chinese).
[15] 赖创林, 刘乐平, 刘剑辉, 等. 碳化养护水泥基材料的抗碳酸水溶液腐蚀性能[J]. 硅酸盐学报, 2023, 51(11): 2890-2904.
LAI C L, LIU L P, LIU J H, et al. Corrosion resistance of cement-based materials by carbonation curing to carbonic acid solution[J]. Journal of the Chinese Ceramic Society, 2023, 51(11): 2890-2904 (in Chinese).
[16] 罗树琼, 葛亚丽, 潘崇根, 等. 微波活化粉煤灰的微观结构及粉煤灰-水泥浆体的早期性能[J]. 材料导报, 2024, 38(7): 104-109.
LUO S Q, GE Y L, PAN C G, et al. Microstructure of fly ash activated by microwave and early performance of fly ash-cement paste[J]. Materials Reports, 2024, 38(7): 104-109 (in Chinese).
[17] 刘琼, 程安楠, 肖建庄. 通过三步碳化强化再生透水混凝土的性能研究[J]. 广西大学学报(自然科学版), 2023, 48(6): 1331-1339.
LIU Q, CHENG A N, XIAO J Z. Study on performance of reinforcement of recycled pervious concrete by three-step carbonation[J]. Journal of Guangxi University (Natural Science Edition), 2023, 48(6): 1331-1339 (in Chinese).
[18] 田耀刚, 蒋静, 赵成, 等. 水性环氧树脂改性高早强砂浆的耐温机制[J/OL]. 吉林大学学报(工学版), 1-8 (2024-02-28) [2025-03-18]. https://doi.org/10.13229/j.cnki.jdxbgxb.20231161.
TIAN Y G, JIANG J, ZHAO C, et al. Temperature resistance mechanism of high-early-strength cement mortar modified with waterborne epoxy resin[J/OL]. Journal of Jilin University (Engineering and Technology Edition), 1-8 (2024-02-28) [2025-03-18]. https://doi.org/10.13229/j.cnki.jdxbgxb.20231161 (in Chinese).
[19] ULIASZ-BOCHEN＇CZYK A, GAWLICKI M, MOKRZYCKI E, et al. Polymorphic varieties of CaCO₃ as a product of cement grout carbonization[J]. Gospodarka Surowcami Mineralnymi-Mineral Resources Management, 2013, 29(2): 79-88.
[20] 魏超. 钢渣-冷轧废水捕集CO₂动力学及碳酸化渣资源利用研究[D]. 赣州: 江西理工大学, 2021.
WEI C. Kinetics of CO₂ capture by steel slag-cold rolling wastewater and utilization of carbonated slag resources[D]. Ganzhou: Jiangxi University of Science and Technology, 2021 (in Chinese).
[21] 幸超群, 邓怡帆, 笪俊伟, 等. 硅灰-粉煤灰复合矿物掺合料对混凝土性能的影响研究[J]. 新型建筑材料, 2022, 49(9): 52-56+85.
XING C Q, DENG Y F, DA J W, et al. Research on the influence of silica fume-fly ash composite mineral admixture on concrete performance[J]. New Building Materials, 2022, 49(9): 52-56+85 (in Chinese).
[22] YUE G B, ZHANG P, LI Q Y, et al. Performance analysis of a recycled concrete interfacial transition zone in a rapid carbonization environment[J]. Advances in Materials Science and Engineering, 2018, 2018(1): 1962457.
[23] 徐波阳, 吴萌萌. 碳化作用对再生骨料混凝土的力学性能影响分析[J]. 交通科技, 2023(6): 144-147.
XU B Y, WU M M. Analysis of the influence of carbonization on the mechanical properties of recycled aggregate concrete[J]. Transportation Science & Technology, 2023(6): 144-147 (in Chinese).