活化煤矸石水泥水化机理与性能研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3660-3670.

活化煤矸石水泥水化机理与性能研究

刘超群¹, 朱泽文^2,3, 张友华¹, 代力^2,3, 辛崇升⁴, 陈磊伟⁵

1.江西省交通投资集团有限责任公司,南昌 330025;
2.江西省交通科学研究院有限公司,南昌 330200;
3.江西省桥梁结构重点实验室,南昌 330000;
4.武汉理工大学土木工程与建筑学院,武汉 430070;
5.华东交通大学土木建筑学院,南昌 330013

收稿日期:2023-06-05 修订日期:2023-07-31 出版日期:2023-10-15 发布日期:2023-10-17
作者简介:刘超群(1981—),男,高级工程师。主要从事桥梁技术与管理的研究。E-mail:1275029079@qq.com
基金资助:
江西省交通运输厅重大工程科技项目(2021C0008);江西省自然科学基金(20202BABL214043);江西省交通运输厅科技项目(2022H0014)

Hydration Mechanism and Properties of Activated Coal Gangue Cement

LIU Chaoqun¹, ZHU Zewen^2,3, ZHANG Youhua¹, DAI Li^2,3, XIN Chongsheng⁴, CHEN Leiwei⁵

1. Jiangxi Provincial Communications Investment Co., Ltd., Nanchang 330025, China;
2. Jiangxi Transportation Research Institute Co., Ltd., Nanchang 330200, China;
3. Key Laboratory of Bridge Structure of Jiangxi Province, Nanchang 330000, China;
4. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;
5. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China

Received:2023-06-05 Revised:2023-07-31 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 近些年来,水泥的低碳化成为国内外的研究热点,利用活性矿物掺和料取代水泥是一种有效降低CO₂排放量的方法。为验证活化煤矸石作为水泥矿物掺和料的可行性,研究了活化煤矸石对水泥流变性能、力学性能、水化产物及水化程度的影响,揭示了水胶比、龄期及活化煤矸石掺量等对水泥胶砂试件抗压和抗折强度的影响,并利用XRD、SEM和TG/DTG等表征活化煤矸石对水泥水化产物和微观结构的影响。结果表明,活化煤矸石水泥的流变性能对水胶比的变化更加敏感。将活化煤矸石掺入水泥中,能够有效降低水泥早期的水化速率。活化煤矸石含有大量的活性SiO₂和Al₂O₃,具有很强的二次水化反应活性。二次水化产物水化硅酸钙和水化铝酸钙凝胶能够填充水泥机体的孔隙,提升水泥基体的强度。与掺30%(质量分数)石英粉的试件相比,掺30%(质量分数)活化煤矸石试件的28 d抗折和抗压强度分别提升了11.69%和11.82%。

关键词: 水泥, 煤矸石, 水化产物, 流变性能, 力学性能, 低碳

Abstract: The low carbonization of cement has been a research hotspot at home and abroadand in recent years, using active mineral admixture to replace cement is an effective method to reduce CO₂ emission. In order to verify the feasibility of activated coal gangue as cement mineral admixture, the effect of activated coal gangue on rheological properties, mechanical properties, hydration products and hydration degree of cement were studied, and the effects of water-binder ratio, age and activated gangue content on compressive strength and flexural strength of cement mortar specimens were revealed. XRD, SEM and TG/DTG were used to characterize the effect of activated coal gangue on hydration products and microstructure of cement. The results show that the rheological properties of activated coal gangue cement are more sensitive to the change of water-binder ratio. The incorporation of activated coal gangue into cement can effectively reduce the early hydration rate of cement. The activated coal gangue contains a lot of activated SiO₂ and Al₂O₃, and has strong rehydration activity. The secondary hydration products calcium silicate hydrate and calcium aluminate hydrate gel can fill the pores of cement body and improve the strength of cement matrix. Compared with 30% (mass fraction) activated coal gangue sample, the 28 d flexural strength and compressive strength of 30% (mass fraction) activated coal gangue sample increases by 11.69% and 11.82%, respectively.

Key words: cement, coal gangue, hydration product, rheological property, mechanical property, low carbonization

中图分类号:

TQ172

刘超群, 朱泽文, 张友华, 代力, 辛崇升, 陈磊伟. 活化煤矸石水泥水化机理与性能研究[J]. 硅酸盐通报, 2023, 42(10): 3660-3670.

LIU Chaoqun, ZHU Zewen, ZHANG Youhua, DAI Li, XIN Chongsheng, CHEN Leiwei. Hydration Mechanism and Properties of Activated Coal Gangue Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3660-3670.

参考文献

[1] 薛黎明, 王豪杰, 朱兵兵, 等. 煤炭资源可持续力评价与系统协调发展分析[J]. 经济地理, 2020, 40(1): 114-124.
XUE L M, WANG H J, ZHU B B, et al. Evaluation of coal resources sustainability and analysis of system coordination development[J]. Economic Geography, 2020, 40(1): 114-124 (in Chinese).
[2] 王家臣, 刘峰, 王蕾. 煤炭科学开采与开采科学[J]. 煤炭学报, 2016, 41(11): 2651-2660.
WANG J C, LIU F, WANG L. Sustainable coal mining and mining sciences[J]. Journal of China Coal Society, 2016, 41(11): 2651-2660 (in Chinese).
[3] 胡彦勇, 张瑞, 郄晓彤, 等. 全生命周期下中国煤炭资源能源碳排放效率评价[J]. 中国环境科学, 2022, 42(6): 2942-2954.
HU Y Y, ZHANG R, QIE X T, et al. Evaluation of China’s coal resource energy carbon emission efficiency in the whole life cycle[J]. China Environmental Science, 2022, 42(6): 2942-2954 (in Chinese).
[4] 张建强, 宁树正, 陈美英, 等. 我国煤炭资源开发前景及对策[J]. 地质论评, 2020, 66(增刊1): 143-145.
ZHANG J Q, NING S Z, CHEN M Y, et al. Prospect and countermeasures of coal resources development in China[J]. Geological Review, 2020, 66(supplement 1): 143-145 (in Chinese).
[5] ZHOU S X. Study on the reaction degree of calcined coal gangue powder in blended cement by selective solution method[J]. Procedia Earth and Planetary Science, 2009, 1(1): 634-639.
[6] 常纪文, 杜根杰, 杜建磊, 等. 我国煤矸石综合利用的现状、问题与建议[J]. 中国环保产业, 2022(8): 13-17.
CHANG J W, DU G J, DU J L, et al. Current situation of the comprehensive utilization of coal gangue in China and the related problems and recommendations[J]. China Environmental Protection Industry, 2022(8): 13-17 (in Chinese).
[7] 张世鑫, 刘冬, 邵飞, 等. 煤矸石综合利用工艺探索[J]. 洁净煤技术, 2013, 19(5): 92-95+122.
ZHANG S X, LIU D, SHAO F, et al. Comprehensive utilization of coal gangue[J]. Clean Coal Technology, 2013, 19(5): 92-95+122 (in Chinese).
[8] LI Y F, LIU S H, GUAN X. Multitechnique investigation of concrete with coal gangue[J]. Construction and Building Materials, 2021, 301: 124114.
[9] QIU J S, ZHOU Y X, GUAN X, et al. The influence of fly ash content on ITZ microstructure of coal gangue concrete[J]. Construction and Building Materials, 2021, 298: 123562.
[10] WANG C B, YANG J X, XU S Z. Experimental study of the mechanical and microstructure characteristics of coal gangue road stabilization materials based on alkali slag cementation[J]. Materials, 2021, 14(13): 3601.
[11] 刘作毅. 透视水泥产量变化[J]. 中国建材, 2022, 71(4): 114-118.
LIU Z Y. Perspective on the change of cement output[J]. China Building Materials, 2022, 71(4): 114-118 (in Chinese).
[12] XU D L, CUI Y S, LI H, et al. On the future of Chinese cement industry[J]. Cement and Concrete Research, 2015, 78: 2-13.
[13] MONTEIRO P J M, MILLER S A, HORVATH A. Towards sustainable concrete[J]. Nature Materials, 2017, 16(7): 698-699.
[14] ARREOLA SANCHEZ M, CHAVEZ GARCIA H L, MARTINEZ MOLINA W, et al. Use of metakaolin or coal gangue as a partial substitution of cement in mechanical performance of PC mortars[J]. European Journal of Environmental and Civil Engineering, 2021, 25(3): 502-515.
[15] 王菲, 刘泽, 韩乐, 等. 活化煤矸石地质聚合物的制备与性能研究[J]. 硅酸盐通报, 2021, 40(3): 914-920.
WANG F, LIU Z, HAN L, et al. Preparation and properties of activated coal gangue geopolymer[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(3): 914-920 (in Chinese).
[16] 张卫清, 柴军, 冯秀娟, 等. 煤矸石基地质聚合物的制备及微观结构[J]. 中国矿业大学学报, 2021, 50(3): 539-547.
ZHANG W Q, CHAI J, FENG X J, et al. Preparation and microstructure of coal gangue-based geopolymer[J]. Journal of China University of Mining & Technology, 2021, 50(3): 539-547 (in Chinese).
[17] 朱愿愿, 王爱国, 孙道胜, 等. 煅烧煤矸石细骨料特性及其对砂浆性能的提升作用[J]. 煤炭学报, 2021, 46(11): 3657-3669.
ZHU Y Y, WANG A G, SUN D S, et al. Characteristics of coal gangue fine aggregates after calcination and its effects on the improvement of mortar properties[J]. Journal of China Coal Society, 2021, 46(11): 3657-3669 (in Chinese).
[18] 曹永丹, 李彦鑫, 张金山, 等. 细度和煅烧温度对煤矸石火山灰活性及微观结构的影响[J]. 硅酸盐学报, 2017, 45(8): 1153-1158.
CAO Y D, LI Y X, ZHANG J S, et al. Effects of calcination temperature and particle size on pozzolanic activity and microstructure of coal gangue[J]. Journal of the Chinese Ceramic Society, 2017, 45(8): 1153-1158 (in Chinese).
[19] 段晓牧, 夏军武, 杨建平. 煤矸石细集料对水泥浆体微观结构的影响及其作用机理[J]. 建筑材料学报, 2014, 17(4): 700-705.
DUAN X M, XIA J W, YANG J P. Influence of coal gangue fine aggregate on microstructure of cement mortar and its action mechanism[J]. Journal of Building Materials, 2014, 17(4): 700-705 (in Chinese).
[20] 段晓牧, 夏军武, 杨风州, 等. 煤矸石细集料-水泥基材料力学性能影响的试验研究[J]. 工业建筑, 2014, 44(2): 98-102.
DUAN X M, XIA J W, YANG F Z, et al. Experimental research on the influence of coal gangue fine aggregate-cement-based materials on the mechanical properties[J]. Industrial Construction, 2014, 44(2): 98-102 (in Chinese).
[21] JIU S W, WANG M M, CHEN Y X, et al. Synthesis and characterization of low-carbon cementitious materials from suspended calcined coal gangue[J]. Frontiers in Materials, 2022.
[22] LIU C X, WANG C B, WU J Y, et al. Calcined coal gangue fines as the substitute for slag in the production of alkali-activated cements and its mechanism[J]. Processes, 2022, 10(8): 1557.
[23] YI C, MA H Q, ZHU H G, et al. Study on chloride binding capability of coal gangue based cementitious materials[J]. Construction and Building Materials, 2018, 167: 649-656.
[24] 肖卫. 磷酸镁水泥机场快速修补材料的物理力学性能和耐久性[D]. 南京: 南京航空航天大学, 2015.
XIAO W. Physical and mechanical properties and durability of magnesium phosphate cement airport quick repair material[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2015 (in Chinese).
[25] 张长森, 薛建平, 房利梅. 碱激发烧煤矸石胶凝材料的力学性能和微观结构[J]. 硅酸盐学报, 2004, 32(10): 1276-1280.
ZHANG C S, XUE J P, FANG L M. Mechanical properties and microstructures of alkali activatedburned coal gangue cementitious material[J]. Journal of the Chinese Ceramic Society, 2004, 32(10): 1276-1280 (in Chinese).