固体废弃物混合料在堤坝工程中的强度特性研究
曹英健 , 张少雄 , 张波 , 张力霆 , 耿鑫鑫
石家庄铁道大学学报(自然科学版) ›› 2026, Vol. 39 ›› Issue (2) : 59 -66.
固体废弃物混合料在堤坝工程中的强度特性研究
Study on Strength Characteristics of Solid Waste Mixture in Dam Engineering
针对尾矿砂与粉煤灰资源化利用问题,以两者为主要原料,开展固体废弃物混合料的力学性能研究。在分析材料基本物理性质的基础上,设计9种不同配比方案,采用0、3、7、28 d无侧限抗压强度试验,系统研究水泥、石灰及粉煤灰掺量对强度演化规律的影响。通过分析研究,提出了以尾矿砂与粉煤灰为主要原料的新型混合材料,用于道路基层与底基层结构层。结果表明: ${2}^{\#}\mathrm{、}{4}^{\#}\mathrm{、}{5}^{\#}\mathrm{、}{6}^{\#}\mathrm{、}{7}^{\#}$ 配比 7 d 强度分别为4.4、3.2、2.12、1.52、1.14 MPa,混合料强度随龄期延长显著提高,水泥掺量对强度增长起主导作用,粉煤灰通过二次水化反应可优化结构并提升后期强度,而石灰对强度贡献相对有限;不同配比材料均表现出由塑性向脆性转变的力学特征。基于试验结果,提出了适用于道路基层与底基层的尾矿砂-粉煤灰复合材料体系。
Aiming at the problem of resource utilization of tailings sand and fly ash,this paper took the two as the main raw materials to study the mechanical properties of solid waste mixture.Based on the analysis of the basic physical properties of the material,nine different ratio schemes were designed, and the unconfined compressive strength tests of 0,3,7 and 28 d were used to systematically study the influence of cement,lime and fly ash content on the strength evolution law.Through analysis and research,a new mixed material with tailings sand and fly ash as the main raw material was proposed for the use in road base and subbase structure layer.The results show that the 7 d strength of ${2}^{\#},{4}^{\#},{5}^{\#},{6}^{\#},{7}^{\#}$ ratio is 4.4,3.2, 2.12,1.52,1.14MPa ,respectively.The strength of the mixture significantly increases with the extension of the age,and the cement content plays a leading role in the strength growth.The fly ash can optimize the structure and improve the later strength through the secondary hydration reaction,while the contribution of lime to the strength is relatively limited.The materials with different proportions show the mechanical characteristics of the transition from plasticity to brittleness.Based on the test results,a tailings sand-fly ash composite material system suitable for road base and subbase is proposed.
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