Mechanical Properties and Hydration Mechanism of Red Mud-Fly Ash-Calcium Carbide Slag Composite Cementitious Materials

Abstract

Abstract: In this paper, using red mud, fly ash and calcium carbide slag as the main raw materials, the composite cementitious test blocks of red mud-fly ash, red mud-calcium carbide slag, fly ash-calcium carbide slag binary systems, and red mud-fly ash-calcium carbide slag ternary system were prepared respectively. The size of gelling effect of red mud, fly ash and calcium carbide slag was compared with the compressive strength of the cementitious test blocks at different curing ages. The phase composition, molecular bond structure, microstructure and thermogravimetric characteristics of the cementitious test blocks were analyzed by XRD, FT-IR, SEM and TGA to study the hydration mechanism of different cementitious systems. The results show that the synergistic gelling effect of the ternary system of red mud, fly ash and calcium carbide slag is the largest. When the content of red mud, fly ash and calcium carbide slag is 35%, 30% and 35% (mass fraction) respectively, the 28 d compressive strength of the test block reaches 25.4 MPa. Compared with the binary cementitious system, the ternary cementitious system has higher hydration degree and more complex products. SEM analysis shows that the ternary cementitious system test block of sodium aluminate hydrate (N-A-S-H) and calcium aluminate hydrate (C-A-S-H) are interlinked with the raw materials to form a three-dimensional network structure, which makes the structure more dense and has better mechanical properties.

Key words: cementitious material, red mud, sodium silicaluminate hydrate, calcium silicaluminate hydrate, hydration mechanism, compressive strength

CLC Number:

TU526

LI Yujia, DUAN Siyu, WU Hao, SHI Xiaokai, HAN Xiaoliang, ZHAO Peilun, MA Zhibin. Mechanical Properties and Hydration Mechanism of Red Mud-Fly Ash-Calcium Carbide Slag Composite Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1041-1049.

References

[1] 霍云波, 闫瑾. 产能结构调整关键期下的国内氧化铝市场[J].中国有色金属, 2022(4): 38-41.
HUO Y B, YAN J. Domestic alumina market in the critical period of capacity structure adjustment[J].China Nonferrous Metals, 2022(4): 38-41 (in Chinese).
[2] 张金喜, 丁博, 党海笑. 碱激发赤泥胶凝材料性能与其应用可行性研究[J].公路工程, 2022, 47(4): 136-142.
ZHANG J X, DING B, DANG H X. Study on properties and application feasibility of alkali-activated red mud cementitious materials[J].Highway Engineering, 2022, 47(4): 136-142 (in Chinese).
[3] 金会心, 王尚杰夫, 肖媛丹, 等. 赤泥与粉煤灰资源特性及其协同利用现状研究[J].贵州大学学报(自然科学版), 2022, 39(2): 18-26.
JIN H X, WANG S J F, XIAO Y D, et al. Study on the characteristics and collaborative utilization of red mud and fly ash resources[J].Journal of Guizhou University (Natural Sciences), 2022, 39(2): 18-26 (in Chinese).
[4] XUE S G, JIANG Y F, ZHU F. Ecological disposal and large-scale utilization of bauxite residue: a long way to go[J].Bulletin of Environmental Contamination and Toxicology, 2022, 109(1): 1-2.
[5] 田桃, 吴玉俊, 薛生国, 等. 石膏对赤泥盐分离子迁移的影响[J].中国科学院大学学报, 2019, 36(4): 521-529.
TIAN T, WU Y J, XUE S G, et al. Effects of gypsum amendment on salinity ion migration in bauxite residue[J].Journal of University of Chinese Academy of Sciences, 2019, 36(4): 521-529 (in Chinese).
[6] 王永宝, 原元, 赵人达, 等. 赤泥地聚物混凝土力学性能研究现状及发展趋势[J].材料导报, 2020, 34(15): 15102-15109.
WANG Y B, YUAN Y, ZHAO R D, et al. Research status and development trend of mechanical properties of red mud geopolymer concrete[J].Materials Reports, 2020, 34(15): 15102-15109 (in Chinese).
[7] KE G J, LI Z Y, JIANG H S. Study on long-term solidification of all-solid waste cementitious materials based on circulating fluidized bed fly ash, red mud, carbide slag, and fly ash[J].Construction and Building Materials, 2024, 427: 136284.
[8] 顾童. 碱激发赤泥-粉煤灰基地聚物的制备研究[J].江苏建材, 2022(5): 16-19.
GU T. Study on preparation of the alkali-activated red mud-fly ash based cementitious materials[J].Jiangsu Building Materials, 2022(5): 16-19 (in Chinese).
[9] GUO L Z, LIU J H, ZHOU M, et al. Effect of an alkali activators on the compressive strength and reaction mechanism of coal gangue-slag-fly ash geopolymer grouting materials[J].Construction and Building Materials, 2024, 426: 136012.
[10] 陈静. 高强度赤泥-粉煤灰地聚合物的配比优化及耐久性研究[D].北京: 北京交通大学, 2023.
CHEN J. Study on proportion optimization and durability of high strength red mud-fly ash geopolymer[D].Beijing: Beijing Jiaotong University, 2023 (in Chinese).
[11] 罗晓洪, 张世俊, 郭荣鑫, 等. 电石渣替代水泥作碱激发剂对过硫磷石膏胶凝材料性能和微观结构的影响[J].材料导报, 2023, 37(增刊2): 298-304.
LUO X H, ZHANG S J, GUO R X, et al. Effect of carbide slag instead of cement as alkali activator on properties and microstructure of excess-sulphate phosphogypsum cementitious material[J].Materials Reports, 2023, 37(supplement 2): 298-304 (in Chinese).
[12] 安赛, 王宝民, 陈文秀, 等. 电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制[J].硅酸盐通报, 2023, 42(4): 1333-1343.
AN S, WANG B M, CHEN W X, et al. Interaction mechanism of carbide slag activating slag-fly ash composite cementitious materials[J].Bulletin of the Chinese Ceramic Society, 2023, 42(4): 1333-1343 (in Chinese).
[13] 陈友治, 吴修齐, 殷伟淞, 等. 电石渣对复合胶凝材料力学性能和微观结构的影响[J].硅酸盐通报, 2023, 42(9): 3196-3203.
CHEN Y Z, WU X Q, YIN W S, et al. Effect of calcium carbide residue on mechanical properties and microstructure of composite cementitious material[J].Bulletin of the Chinese Ceramic Society, 2023, 42(9): 3196-3203 (in Chinese).
[14] 燕可洲, 郭彦霞, 李宁静, 等. 氧化钙添加剂对碳酸钠活化粉煤灰的影响及机理[J].硅酸盐通报, 2018, 37(3): 1003-1009.
YAN K Z, GUO Y X, LI N J, et al. Effect and mechanism analysis of calcium oxide additive on the sodium carbonate activation of fly ash[J].Bulletin of the Chinese Ceramic Society, 2018, 37(3): 1003-1009 (in Chinese).
[15] 李召峰, 刘超, 王川, 等. 赤泥-高炉矿渣-钢渣三元体系注浆材料试验研究[J].工程科学与技术, 2021, 53(1): 203-211.
LI Z F, LIU C, WANG C, et al. Experimental study on grouting material of red mud-blast furnace slag-steel slag ternary system[J].Advanced Engineering Sciences, 2021, 53(1): 203-211 (in Chinese).
[16] KIM M S, JUN Y B, LEE C H, et al. Use of CaO as an activator for producing a price-competitive non-cement structural binder using ground granulated blast furnace slag[J].Cement and Concrete Research, 2013, 54: 208-214.
[17] 侯双明, 高嵩, 张蕾, 等. 热活化和机械活化对拜耳法赤泥性能影响[J].硅酸盐通报, 2020, 39(5): 1573-1577.
HOU S M, GAO S, ZHANG L, et al. Effects of thermal and mechanical activation on properties of bayer red mud[J].Bulletin of the Chinese Ceramic Society, 2020, 39(5): 1573-1577 (in Chinese).
[18] 张健. 赤泥协同多源固废制备注浆材料组成设计、水化机理与性能调控[D].济南: 山东大学, 2021.
ZHANG J. Composition design, hydration mechanism and performance control of grouting materials prepared by red mud in cooperation with multi-source solid waste[D].Jinan: Shandong University, 2021 (in Chinese).
[19] 黄华, 郭梦雪, 张伟, 等. 粉煤灰-矿渣基地聚物混凝土力学性能与微观结构[J].哈尔滨工业大学学报, 2022, 54(3): 74-84.
HUANG H, GUO M X, ZHANG W, et al. Mechanical property and microstructure of geopolymer concrete based on fly ash and slag[J].Journal of Harbin Institute of Technology, 2022, 54(3): 74-84 (in Chinese).
[20] PHOO-NGERNKHAM T, PHIANGPHIMAI C, INTARABUT D, et al. Low cost and sustainable repair material made from alkali-activated high-calcium fly ash with calcium carbide residue[J].Construction and Building Materials, 2020, 247: 118543.
[21] BILLONG N, OTI J, KINUTHIA J. Using silica fume based activator in sustainable geopolymer binder for building application[J].Construction and Building Materials, 2021, 275: 122177.
[22] XIN J, LIU L, JIANG Q, et al. Early-age hydration characteristics of modified coal gasification slag-cement-aeolian sand paste backfill[J].Construction and Building Materials, 2022, 322: 125936.
[23] 薛生国, 朱铭星, 杨兴旺, 等. 赤泥激发胶凝材料及路用研究进展[J].中国有色金属学报, 2023, 33(10): 3421-3439.
XUE S G, ZHU M X, YANG X W, et al. Research progress of bauxite residue-activated cementitious materials and its engineering road application[J].The Chinese Journal of Nonferrous Metals, 2023, 33(10): 3421-3439 (in Chinese).
[24] FENG Y, YANG Q X, CHEN Q S, et al. Characterization and evaluation of the pozzolanic activity of granulated copper slag modified with CaO[J].Journal of Cleaner Production, 2019, 232: 1112-1120.
[25] 张嘉芮, 谭文杰, 井敏, 等. 活化温度对赤泥基胶凝材料性能的影响[J].砖瓦, 2024(5): 40-43.
ZHANG J R, TAN W J, JING M, et al. Effect of activation temperature on mechanical properties of red mud-based cementitious materials[J].Brick-Tile, 2024(5): 40-43 (in Chinese).