Size effect and damage mechanisms in cementitious tungsten tailing backfill materials with varying hydroxypropyl methyl cellulose dosages

Abstract

The problems of tailings storage and high-stress conditions in deep mining have emerged as critical factors that limit the security, efficiency, and sustainability of such mines. This study explores the potential to utilize tungsten tailings to create cementitious backfill (CTB) materials and investigates the macroscopic strength features and microscopic damage evolution mechanisms of different-sized CTBs with varying dosages of hydroxypropyl methyl cellulose (HPMC). Specimens with bottom diameters of 50, 75, and 100 mm are combined with HPMC dosages of 0, 0.15wt%, 0.25wt%, and 0.35wt%. A diameter/height ratio of 1:2 is maintained for all CTB specimens. The experimental results show that as the HPMC dosage is increased from 0 to 0.35wt%, the uniaxial compressive strength (UCS) of the CTBs decreases significantly in a linear manner. The 75 mm × 150 mm CTB specimen exhibits relatively high plasticity and toughness, with good plastic deformation and energy absorption capabilities, indicating significant size effects. HPMC introduces connected bubbles during the CTB pouring process, but it exhibits anti-segregation and anti-bleeding characteristics, thus reducing tailing settling. The hydration reaction of the CTB doped with HPMC is more uniform, and the Ca/Si atomic ratio dispersion at different sites is smaller. The three CTB sizes all exhibit combined tensile and shear failure, with the 75 mm × 150 mm specimen exhibiting macroscopic tensile cracks and relatively few shear cracks. At the micro-scale, excessive ettringite and hydrated calcium silicate are interwoven and fuse, and the tungsten tailings are tightly wrapped. These results provide valuable data and notional insights for optimizing the fluidity of the backfill, and elucidate the strength and damage evolution of solidified materials during filling and extraction. This study contributes to the advancement of green, economical, safe, and sustainable mining practices.

Keywords

tailings storage / high stress / backfill / hydroxypropyl methyl cellulose / strength / energy dissipation / microstructure

References

[1] P. Zeng, L.Y. Liang, and Z.C. Duan, Ecological and environmental impacts of mineral exploitation in urban agglomerations, Ecol. Indic., 148(2023), art. No. 110035.

[2] W.Q. Chen, W. Xiao, T.T. He, L.L. Ruan, Y.L. Zhao, and Z.Q. Hu, Quantify the extensive crop damage and grain losses caused by underground coal mining subsidence in eastern China, J. Cleaner Prod., 469(2024), art. No. 143204.

[3] V. Prakash, S.K. Sinha, N.C. Das, and D.C. Panigrahi, Sustainable mining metrics en route a coal mine case study, J. Cleaner Prod., 268(2020), art. No. 122122.

[4] LiP, CaiMF. Challenges and new insights for exploitation of deep underground metal mineral resources. Trans. Nonferrous Met. Soc. China, 2021, 31113478.

[5] MengQB, HanLJ, ChenYL, et al.. Influence of dynamic pressure on deep underground soft rock roadway support and its application. Int. J. Min. Sci. Technol., 2016, 265903.

[6] M. Mirzehi and A.M. Afrapoli, A novel framework for integrating environmental costs and carbon pricing in open-pit mine plans: Towards sustainable and green mining, J. Cleaner Prod., 468(2024), art. No. 143059.

[7] H.X. Yu, I. Zahidi, and C.M. Fai, Reclaiming abandoned mine tailings ponds for agricultural use: Opportunities and challenges, Environ. Res., 232(2023), art. No. 116336.

[8] AdiansyahJS, RosanoM, VinkS, KeirG. A framework for a sustainable approach to mine tailings management: disposal strategies. J. Cleaner Prod., 2015, 1081050.

[9] EdrakiM, BaumgartlT, ManlapigE, BradshawD, FranksDM, MoranCJ. Designing mine tailings for better environmental, social and economic outcomes: A review of alternative approaches. J. Cleaner Prod., 2014, 84411.

[10] BhattacharyaA, RouthJ, JacksG, BhattacharyaP, MörthM. Environmental assessment of abandoned mine tailings in Adak, Västerbotten district (northern Sweden). Appl. Geochem., 2016, 21101760.

[11] SunZH, XieXD, WangP, HuYA, ChengHF. Heavy metal pollution caused by small-scale metal ore mining activities: A case study from a polymetallic mine in South China. Sci. Total Environ., 2018, 639217.

[12] BanzaCLN, NawrotTS, HaufroidV, et al.. High human exposure to cobalt and other metals in Katanga, a mining area of the Democratic Republic of Congo. Environ. Res., 2009, 1096745.

[13] ZhuGX, XiaoHY, GuoQJ, et al.. Heavy metal contents and enrichment characteristics of dominant plants in wasteland of the downstream of a lead-zinc mining area in Guangxi, Southwest China. Ecotoxicol. Environ. Saf., 2018, 151266.

[14] AdewuyiSO, AnaniA, LuxbacherK. Advancing sustainable and circular mining through solid–liquid recovery of mine tailings. Process. Saf. Environ. Prot., 2024, 18931.

[15] K. Islam and S. Murakami, Global-scale impact analysis of mine tailings dam failures: 1915–2020, Global Environ. Change, 70(2021), art. No. 102361.

[16] ByrneP, Hudson-EdwardsKA, BirdG, et al.. Water quality impacts and river system recovery following the 2014 Mount Polley mine tailings dam spill, British Columbia, Canada. Appl. Geochem., 2018, 9164.

[17] S. Evro, B.A. Oni, and O.S. Tomomewo, Global strategies for a low-carbon future: Lessons from the US, China, and EU’s pursuit of carbon neutrality, J. Cleaner Prod., 461(2024), art. No.142635.

[18] W.G. Chen and S.H. Yan, The decoupling relationship between CO₂ emissions and economic growth in the Chinese mining industry under the context of carbon neutrality, J. Cleaner Prod., 379(2022), art. No. 134692.

[19] A. Amin, N.Y.B.M. Yusoff, S. Peng, C. Magazzino, A. Sharif, and H.W. Kamran, Driving sustainable development: The impact of energy transition, eco-innovation, mineral resources, and green growth on carbon emissions, Renewable Energy, 238(2025), art. No. 121879.

[20] T. Gao, A.X. Wu, S.Y. Wang, Z.E. Ruan, C. Chen, and W. Sun, Experimental and numerical investigations of bending mechanical properties and fracture characteristics of cemented tailings-waste rock backfill under three-point bending, Constr. Build. Mater., 447(2024), art. No. 138149.

[21] Y.F. Hu, L.J. Zheng, B. Zhang, K.Q. Li, and B. Han, Key attributes of superfine tailings cemented paste backfill modified with nano-Al₂O₃: Mechanical properties, flowability, microstructure, and thermal decomposition characteristics, Constr. Build. Mater., 458(2025), art. No. 139511.

[22] S.J. Liu, H.Y. Gu, K. Yang, et al., Preparation activated tailings by pH swing process: Towards yielding cemented tailings backfill and in-situ CO₂ mineralization, Cem. Concr. Compos., 154(2024), art. No. 105767.

[23] WuAX, WangY, WangHJ, YinSH, MiaoXX. Coupled effects of cement type and water quality on the properties of cemented paste backfill. Int. J. Miner. Process., 2015, 14365.

[24] WuAX, WangY, WangHJ. Estimation model for yield stress of fresh uncemented thickened tailings: Coupled effects of true solid density, bulk density, and solid concentration. Int. J. Miner. Process, 2015, 143117.

[25] X.L. Wang, H.J. Wang, A.X. Wu, and G.W. Kang, Wear law of Q345 steel under the abrasion-corrosion synergistic effect of cemented paste backfill, Constr. Build. Mater., 332(2022), art. No. 127283.

[26] ZhengD, SongWD, TanYY, CaoS, YangZL, SunLJ. Fractal and microscopic quantitative characterization of unclassified tailings flocs. Int. J. Miner. Metall. Mater., 2021, 281429.

[27] ChengAP, DaiSY, ZhangYS, HuangSB, YeZY. Study on size effect of damage evolution of cemented backfill. Chin. J. Rock Mech. Eng., 2019, 383053

[28] P.S.M. Thilakarathna, K.S.K. Baduge, P. Mendis, H. Lee, E.R.K. Chandrathilaka, and V. Vimonsatit, Multiscale modelling framework for elasticity of ultra high strength concrete using nano/microscale characterization and finite element representative volume element analysis, Constr. Build. Mater., 327(2022), art. No. 126968.

[29] A.A. Wang, S. Cao, and E. Yilmaz, Effect of height to diameter ratio on dynamic characteristics of cemented tailings backfills with fiber reinforcement through impact loading, Constr. Build. Mater., 322(2022), art. No. 126448.

[30] YilmazE, BelemT, BenzaazouaM. Specimen size effect on strength behavior of cemented paste backfills subjected to different placement conditions. Eng. Geol., 2015, 18552.

[31] LiCB, YangDC, XieHP, RenL, WangJ. Size effect of fracture characteristics for anisotropic quasi-brittle geomaterials. Int. J. Min. Sci. Technol., 2023, 332201.

[32] LiYL, GuoSJ, YangRS, XieLY, LuSH. Effects of gangue particle-size gradation on damage and failure behavior of cemented backfill under uniaxial compression. Int. J. Miner. Metall. Mater., 2025, 3271483.

[33] GuoYX, ZhaoYH, WangSW, FengGR, ZhangYJ, RanHY. Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression. J. Cent. South Univ., 2021, 2861724.

[34] LiM, MaoXB, LuAH, et al.. Effect of specimen size on energy dissipation characteristics of red sandstone under high strain rate. Int. J. Min. Sci. Technol., 2014, 242151.

[35] WuFQ, QiaoL, GuanSG, ZhangQT, WangZY, WuJ. Uniaxial compression test study on size effect of small size rock samples. Chin. J. Rock Mech. Eng., 2021, 405865

[36] GuoYX, ZhaoYH, FengGR, RanHY, ZhangYJ. Study on damage size effect of cemented gangue backfill body under uniaxial compression. Chin. J. Rock Mech. Eng., 2021, 40122434

[37] Y. Yu, J.J. Xu, J. Su, L. Xu, and Y. Luo, Investigating specimen size and shape effects on compressive mechanical behaviors of recycled aggregate concrete using discrete element mesoscale modeling, Constr. Build. Mater., 438(2024), art. No. 137196.

[38] ZhangLL, JiYS, LiJ, GaoFR, HuangGD. Effect of retarders on the early hydration and mechanical properties of reactivated cementitious material. Constr. Build. Mater., 2019, 212192.

[39] A.K. Mohapatra and B. Pradhan, Effect of sodium gluconate addition on setting, hardening, and microstructure behaviour of hybrid alkaline mortar, Constr. Build. Mater., 451(2024), art. No. 138782.

[40] Y. Liu, H. Li, K. Wang, H.F. Wu, and B.Q. Cui, Effects of accelerator-water reducer admixture on performance of cemented paste backfill, Constr. Build. Mater., 242(2020), art. No. 118187.

[41] Q.S. Zhang, J.P. Qiu, H.Q. Jiang, et al., Effect of hydroxypropyl methyl cellulose on coarse tailings cemented backfill: Rheology, stability, strength and microstructure, Constr. Build. Mater., 425(2024), art. No. 136042.

[42] C.J. Gu, B.G. Yang, F.G. Yang, Q.F. Ren, and M.C. Silva, Fluidity and rheological properties with time-dependence of cemented fine-grained coal gangue backfill containing HPMC using response surface method, Constr. Build. Mater., 451(2024), art. No. 138691.

[43] S.H. Yin, Z.P. Yan, X. Chen, et al., Active roof-contact: The future development of cemented paste backfill, Constr. Build. Mater., 370(2023), art. No. 130657.

[44] S.Y. Zhang, L. Yang, F.Y. Ren, J.P. Qiu, and H.X. Ding, Rheological and mechanical properties of cemented foam backfill: Effect of mineral admixture type and dosage, Cem. Concr. Compos., 112(2020), art. No. 103689.

[45] X.W. Gu, S.Y. Wang, J.P. Liu, et al., Effect of hydroxypropyl methyl cellulose (HPMC) as foam stabilizer on the workability and pore structure of iron tailings sand autoclaved aerated concrete, Constr. Build. Mater., 376(2023), art. No. 130979.

[46] J.H. Zhou, H.S. Shang, Y. Huang, and L. Fan, Experimental investigation on bond properties of nano-Al₂O₃ and hydroxypropyl methyl cellulose (HPMC) modified coated steel bar embedded in concrete, J. Build. Eng., 98(2024), art. No. 110928.

[47] W.T. Chen, Y. Zhou, Q.J. Yu, et al., Microscopic thickening mechanisms of hydroxypropyl methyl cellulose ether anti-washout admixture and its impact on cementitious material rheology and anti-dispersal performance, J. Build. Eng., 89(2024), art. No. 109346.

[48] MaBG, PengY, TanHB, et al.. Effect of hydroxypropylmethyl cellulose ether on rheology of cement paste plasticized by polycarboxylate superplasticizer. Constr. Build. Mater., 2018, 160341.

[49] C.C. Guo, N. Chen, and R. Wang, Study on hydroxypropyl methylcellulose modified Portland cement-sulphoaluminate cement composites: Rheology, setting time, mechanical strength, resistance to chloride ingress, early reaction kinetics and microstructure, J. Build. Eng., 98(2024), art. No. 111070.

[50] KeX, HouHB, ZhouM, WangY, ZhouX. Effect of particle gradation on properties of fresh and hardened cemented paste backfill. Constr. Build. Mater., 2015, 96378.

[51] CaoS, SongWD, XueGL, WangY, ZhuPR. Tests of strength reduction of cemented tailings filling considering layering character. Rock Soil Mech., 2015, 36102869

[52] NguyenDD, DevlinLP, KoshyP, SorrellCC. Impact of water-soluble cellulose ethers on polymer-modified mortars. J. Mater. Sci., 2014, 49923.

[53] PaturalL, MarchalP, GovinA, GrosseauP, RuotB, DevèsO. Cellulose ethers influence on water retention and consistency in cement-based mortars. Cem. Concr. Res., 2011, 41146.

[54] Z.Z. Zhi, B.G. Ma, H.B. Tan, et al., Effect of competitive adsorption between polycarboxylate superplasticizer and hydroxypropylmethyl cellulose on rheology of gypsum paste, J. Mater. Civ. Eng., 30(2018), No. 7, art. No. 04018141.

[55] BullardJW, JenningsHM, LivingstonRA, et al.. Mechanisms of cement hydration. Cem. Concr. Res., 2011, 41121208.

[56] WinnefeldF, LothenbachB. Hydration of calcium sulfoaluminate cements—Experimental findings and thermodynamic modelling. Cem. Concr. Res., 2010, 4081239.

[57] WyrzykowskiM, KiesewetterR, KaufmannJ, BaumannR, LuraP. Pore structure of mortars with cellulose ether additions–Mercury intrusion porosimetry study. Cem. Concr. Compos., 2014, 5325.

[58] SheW, DuY, MiaoCW, et al.. Application of organic-and nanoparticle-modified foams in foamed concrete: Reinforcement and stabilization mechanisms. Cem. Concr. Res., 2018, 10612.

[59] M.L. Jiang, S. Cao, and E. Yilmaz, Analyzing microscopic structure and macroscopic strength behavior of cement-based tail fills incorporating fiber by X-ray CT scanning technique, Constr. Build. Mater., 440(2024), art. No. 137453.

[60] WangSS, YangRS, LiYL, YueZW. Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill. Int. J. Miner. Metaall. Mater., 2024, 31112404.

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