高掺量粉煤灰淤泥固化土无侧限抗压强度试验研究

Experimental study on unconfined compressive strength of sludge solidified soil with high volume fly ash

为实现固废粉煤灰改性淤泥资源化利用,通过无侧限抗压强度试验研究了粉煤灰掺量、养护龄期对淤泥固化土力学性能的影响。结果表明,随粉煤灰掺量的增加、养护龄期的延长,淤泥固化土的抗压强度和变形模量均有不同程度的提高;在高掺量粉煤灰条件下,粉煤灰早期火山灰效应和水化效应对淤泥固化土的强度提升不明显,34.5%高掺量粉煤灰、90 d长养护龄期条件下强度增幅最显著。

In order to achieve the resource utilization of fly ash modified sludge,the mechanical properties of solidified sludge soil under the influence of fly ash content and curing time were studied through unconfined compressive strength tests.The experimental results show that the compressive strength and deformation modulus of solidified sludge soil increase to different levels with the increasing of fly ash content and the increasing of curing age.In the case of high-volume fly ash,the volcanic ash effect and hydration effect in the early curing time of fly ash do not significantly increase the strength of solidified sludge soil.The unconfined compressive strength increases the most significant under the condition of 34.5%high content fly ash and long curing period of 90 days.