Utilization of pretreated municipal solid waste incineration fly ash for cement-stabilized soil.,Waste Management

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Utilization of pretreated municipal solid waste incineration fly ash for cement-stabilized soil.
Waste Management ( IF 7.1 ) Pub Date : 2020-02-29 , DOI: 10.1016/j.wasman.2020.02.017
Shihua Liang ₁ , Juntao Chen ₁ , Mingxin Guo ₁ , Deluan Feng ₁ , Liang Liu ₂ , Tian Qi ₃

Affiliation

In this study, the feasibility of using municipal solid waste incineration fly ash (MSWIFA) as additive for the strengthening of pretreated cement-stabilized soil was evaluated. Results indicated that the leaching concentrations of chromium and lead in MSWIFA after the water washing process and addition of 4% ferrous sulphate were reduced by 67% and 89%, respectively, which was lower than the limit value of Identification standard for hazardous waste (GB 5085.3-2007). After pretreatment, MSWIFA samples with ratios of 5% and 10% were blended into cement-stabilized soil with ordinary Portland cement (OPC) content of 10%, 15% and 20%. The unconfined compressive strength (UCS), internal friction angle and cohesion of the cement-stabilized soil increased with OPC and pretreated MSWIFA (PFA) content. The same effect was observed on UCS after the addition of 10% PFA as replacement of 5% OPC. In the subsequent X-ray powder diffraction test, scanning electron microscopy and leaching tests, the leaching concentrations of heavy metals in cement-stabilized soil became far lower than the limit value under the synergistic effects of the physical encapsulation of hydration products and stabilization of chemical agents. The incorporation of PFA as a supplementary material can effectively accelerate the formation of hydration products and can thus provide cleaner options for foundation reinforcement.

中文翻译：

将预处理的城市固体废物焚烧粉煤灰用于水泥稳定的土壤。

在这项研究中，评估了使用城市固体废物焚烧飞灰（MSWIFA）作为添加剂来增强预处理的水泥稳定土的可行性。结果表明，水洗和添加4％的硫酸亚铁后，MSWIFA中铬和铅的浸出浓度分别降低了67％和89％，低于危险废物鉴定标准（GB）的限值。 5085.3-2007）。预处理后，将比例为5％和10％的MSWIFA样品掺入普通硅酸盐水泥（OPC）含量为10％，15％和20％的水泥稳定土壤中。水泥稳定土的无侧限抗压强度（UCS），内摩擦角和内聚力随OPC和预处理MSWIFA（PFA）含量的增加而增加。加入10％PFA代替5％OPC后，在UCS上观察到相同的效果。在随后的X射线粉末衍射试验，扫描电子显微镜和浸出试验中，在水合产物物理包封和化学稳定作用的协同作用下，水泥稳定土壤中重金属的浸出浓度远低于极限值。代理商。掺入PFA作为补充材料可以有效地加速水合产物的形成，从而可以为基础加固提供更清洁的选择。在水合产物物理包封和化学试剂稳定化的协同作用下，水泥稳定土壤中重金属的浸出浓度变得远低于极限值。掺入PFA作为补充材料可以有效地加速水合产物的形成，从而可以为基础加固提供更清洁的选择。在水合产物物理包封和化学试剂稳定化的协同作用下，水泥稳定土壤中重金属的浸出浓度变得远低于极限值。掺入PFA作为补充材料可以有效地加速水合产物的形成，从而可以为基础加固提供更清洁的选择。

更新日期：2020-03-02

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