The excavation of construction foundation pits, tunnels, channels, and other projects generates a significant volume of engineering muck, posing challenges in management. Prolonged accumulation of this muck can lead to environmental pollution. The effective recycling of this type of construction waste is crucial for the advancement of a circular economy, necessitating immediate attention to research and solutions. In this study, a novel method is introduced for the preparation of low-carbon and environmentally friendly ecological concrete. This method involves the utilization of recycled engineering muck particles to substitute a portion of the natural aggregate and enables the comprehensive recycling of engineering muck. Subsequently, the mechanical and permeability properties of ecological concrete under varying muck particle content and porosity conditions are analyzed through experiments, taking into account the impact of relative average pore diameter and pore tortuosity. A predictive model has been developed for the tortuosity of pore channels in ecological concrete, taking into account effective porosity and average pore diameter. The enhanced Kozney-Carman model is employed to describe the correlation between pore properties and hydraulic conductivity. The findings indicate that a composite curing agent is formed by combining ordinary Portland cement with a hydrophilic polyurethane solution. This composite curing agent demonstrates superior performance compared to pure cement in the solidification of engineering muck. As the replacement rate of unsintered recycled residue particles increases, the porosity of concrete may increase by up to 29.7 %. This results in enhanced permeability characteristics but a decrease in compressive strength. In contrast to lightweight aggregates manufactured through the sintering process, the carbon emissions of unsintered recycled residue particles are reduced by 57.7 %. This study provides suggestions for the repurposing of construction waste and contributes to the advancement of sustainable practices within the concrete production sector.

中文翻译：

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再生工程渣土颗粒生态混凝土力学及渗透性能

建筑基坑、隧道、渠道等工程开挖产生大量工程渣土，给管理带来了挑战。这些淤泥的长期堆积会导致环境污染。此类建筑垃圾的有效回收对于循环经济的发展至关重要，需要立即关注研究和解决方案。本研究介绍了一种制备低碳环保生态混凝土的新方法。该方法利用回收的工程渣土颗粒替代部分天然骨料，实现了工程渣土的综合回收利用。随后，通过实验分析了不同渣土颗粒含量和孔隙率条件下生态混凝土的力学和渗透性能，并考虑了相对平均孔径和孔隙迂曲度的影响。考虑到有效孔隙率和平均孔径，开发了生态混凝土孔道弯曲度的预测模型。采用增强的 Kozney-Carman 模型来描述孔隙性质与导水率之间的相关性。研究结果表明，复合固化剂是由普通硅酸盐水泥与亲水性聚氨酯溶液混合而成。该复合固化剂在工程渣土固化方面表现出较纯水泥优越的性能。随着未烧结再生残渣颗粒替代率的提高，混凝土的孔隙率最多可增加29.7%。这导致渗透特性增强，但抗压强度降低。与通过烧结工艺制造的轻质骨料相比，未烧结的回收残留颗粒的碳排放量减少了 57.7%。这项研究为建筑垃圾的再利用提供了建议，并有助于推进混凝土生产领域的可持续实践。