Preparation of sustainable backfill cementitious materials:Mix proportion optimization,hydration mechanism,and sustainability assessmentOA
Using cement as a filling cementitious material is challenging because of high energy consumption,high cost,and considerable carbon emissions.Thus,a new type of filling cementitious material,which involved soda residue(SR),calcium carbide slag(CS),ground granulated blast-furnace slag(GGBS),and fly ash(FA)as raw materials,was proposed in this study to replace conventional Portland cement.Response surface tests were conducted on test specimens to determine the optimal mixture proportion.The hydration mechanism of the developed filling cementitious material was investigated using low-field nuclear magnetic resonance,scanning electron microscopy,X-ray diffraction,and Fourier-transform infrared spectroscopy.The results indicated that the optimal mixture proportion of the developed cementitious material was as follows:SR:CS:FA:GGBS=15:7.41:37.27:40.32.The 28-d unconfined compressive strength(UCS)of the composite filling material was 23.01 MPa.The test results indicated a 28-d UCS of 24.14 MPa and a fluidity of 164 mm.Response surface methodology was used to optimize the performance of the filling cementitious material.The CS concentration of the material exhibited the most significant influence on the UCS,followed by FA and SR.Microstructural analyses indicated that the main hydration products of the new material were Friedel’s salt(FS),ettringite,hydrotalcite,C-(A)-S-H gel,and hemicarbonate,among which the C-(A)-S-H gel and FS were the dominant sources of strength in the material.The developed cementitious material can effectively reduce carbon emissions by 92%relative to cement-based binders.It can be used as a substitute for cement in mine filling with excellent economic and environmental benefits.
Haowei Pang;Yanli Huang;Wenyue Qi;Qingxin Zhao;Yingying Wang;Dezhi Zhao;Fankun Kong;Jinyao Han
Key Laboratory of Xinjiang Coal Resources Green Mining,Ministry of Education,Xinjiang Institute of Engineering,Urumqi 830023,China Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering,Yanshan University,Qinhuangdao 066004,ChinaKey Laboratory of Xinjiang Coal Resources Green Mining,Ministry of Education,Xinjiang Institute of Engineering,Urumqi 830023,China State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,ChinaKey Laboratory of Xinjiang Coal Resources Green Mining,Ministry of Education,Xinjiang Institute of Engineering,Urumqi 830023,China State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering,Yanshan University,Qinhuangdao 066004,ChinaState Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,ChinaChina Coal Tianjin Design Engineering Co.,Ltd.,Tianjin 300000,ChinaHebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering,Yanshan University,Qinhuangdao 066004,ChinaHebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering,Yanshan University,Qinhuangdao 066004,ChinaHebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Hebei Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering,Yanshan University,Qinhuangdao 066004,China
矿业与冶金
Cement paste backfillingFilling cementitious materialResponse surface methodologyAll solid wasteSynergistic activationCarbon emission
《Green and Smart Mining Engineering》 2026 (1)
P.41-53,13
support received by Central Guidance Fund for Local Science and Technology Development(No.ZYYD2024JD16)Natural Science Foundation of Hebei Province(No.E2024203076)Science Research Project of Hebei Education Department(No.BJK2024141)Xinjiang Uygur Autonomous Region Science and Technology Major Program(No.2023A01002)Open subject of Key Laboratory of Xinjiang Coal Resources Green Mining,Ministry of Education,Xinjiang Institute of Engineering(No.KLXGY-KB2404).
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