Effect of mine tailings particle size and curing temperature on the strength evolution and rheology of cemented paste backfill:A case study AITranslate

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Chinese Library Classification Number:TD803[矿业工程—矿山开采]

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This paper investigates the influence of mine tailings particle size and curing temperature on the rheological properties and strength development of cemented paste backfill(CPB).Laboratory experiments were conducted on CPB to evaluate their physical and mechanical behavior.A series of CPB samples with different mixture designs were prepared and cured for 28 days.The effect of curing temperature and particle size on mechanical properties was assessed using uniaxial compressive strength(UCS)tests.In addition,the influence of curing temperature(ranging from 5°C to 50°C)on CPB samples was studied through UCS testing.The microstructure of selected specimens was further analyzed using the mercury intrusion porosimetry(MIP)technique.The results indicate that:(i)the mechanical performance of CPB can be enhanced by reducing the proportion of fine particles in the tailings;(ii)the rate of strength gain increases with decreasing particle size,samples exhibiting faster strength development than CPB samples over the 28-day curing period;(iii)curing temperature has a significant impact on both the mechanical and microstructural properties of CPB;(iv)microstructural analysis revealed that reducing fine particles modifies pore size distribution and decreases overall porosity,thereby improving the mechanical behavior of CPB;and(v)MIP results showed that the reduction of particle size altered the microstructure,leading to a higher proportion of fine pores in CPB.