The marble process industry from Shaq Al-Thouban region, which is located in East Cairo, Egypt, produces a huge amount of marble wastes every day during the cutting and processing stages. Up to now, most of these wastes are dumping on open land which creates serious environmental problems. The amount of waste marble from the processing stage is about 20 to 25% of the total processed stone. Egypt also suffers from the problem of expansive soil that occupies a large area of its lands, especially in the new cities that are built on these lands. The primary purpose of this study is to use this waste material in the soil stabilization in point of view utilization of this waste as local low-cost materials and elimination of their negative environmental impacts. The waste marble dust was mixed with expansive soil samples with various percentages of 5%, 10%, 15%, 20%, and 25% by dry weight of soil. Different tests including Atterberg’s limits, standard Proctor compaction, unconfined compressive strength (UCS), California bearing ratio (CBR), swelling percentage, linear shrinkage (LS) tests, and XRF and XRD analyses were conducted for natural and marble dust stabilized soils. The soil mixtures used for UCS, CBR, and swell tests were compacted at the optimum moisture content (OMC) and maximum dry density (MDD) using the standard Proctor compaction method and cured for 7 days. The results of the tests showed that there are significant effects in enhancing the properties of expansive soils. Also, the results showed that as the percentage of the marble dust increases the plasticity index, the swelling potential of the expansive clayey soil decreases. Furthermore, the optimum moisture content decreases, and the maximum dry density increases. Also, UCS, CBR, and the calcite content of the soil mixtures increase with the increase in marble dust content.

中文翻译：

---

废大理石粉尘对膨胀粘土改良的影响

位于埃及东开罗的 Shaq Al-Thouban 地区的大理石加工业在切割和加工阶段每天都会产生大量的大理石废料。到目前为止，这些废物大部分都倾倒在开阔的土地上，造成了严重的环境问题。加工阶段产生的废大理石约占加工石材总量的 20% 至 25%。埃及还面临着土地膨胀的问题，占据了大片土地，尤其是在这些土地上建造的新城市。本研究的主要目的是在土壤稳定中使用这种废物，以将这种废物用作当地的低成本材料并消除其对环境的负面影响。将废弃的大理石粉尘与膨胀土样品按 5% 的不同比例混合，土壤干重的 10%、15%、20% 和 25%。对天然和大理石粉尘稳定的土壤进行了不同的测试，包括 Atterberg 极限、标准 Proctor 压实、无侧限抗压强度 (UCS)、加利福尼亚承载比 (CBR)、膨胀百分比、线性收缩 (LS) 测试以及 XRF 和 XRD 分析。用于 UCS、CBR 和膨胀试验的土壤混合物使用标准 Proctor 压实方法在最佳含水量 (OMC) 和最大干密度 (MDD) 下压实，并固化 7 天。试验结果表明，对增强膨胀土的性质有显着效果。此外，结果表明，随着大理石粉尘百分比的增加，塑性指数的增加，膨胀粘土的膨胀潜力降低。此外，最佳含水量减少，最大干密度增加。此外，UCS、CBR 和土壤混合物的方解石含量随着大理石粉尘含量的增加而增加。