Scholarlink

<p>Although previous studies have shown remarkable effects of traditional additives on enhancing the engineering properties of problematic soils, the operation of manufacturing this material has been accompanied with concerns. On the other hand, large quantities of industrial wastes and serious environmental problems caused by their dumping have stimulated researchers to seek alternative additives. Therefore, the present study investigated the effectiveness of calcium carbide residue (CCR) and fly ash (FA) to improve the physical and mechanical properties of fat clay. In this regard, hydrated lime (HL) was used as a controlling additive. For this purpose, 15 Atterberg limits, 14 compactions, 71 Unconfined compressive strength (UCS), and 15 unconsolidated-undrained triaxial tests were carried out. Results showed that the addition of HL and CCR lead to a significant reduction in the soil plasticity. By increasing the amount of additives, optimum moisture content (OMC) and maximum dry unit weight (MDUW) increased and decreased, respectively. The results varied from 22.6 to 26.8% (increase) for OMC and from 16.34 to 14.62&#xa0;kN/m<sup>3</sup> (decrease) for MDUW. Based on the results, the UCS of CCR-treated samples increased by adding FA contents up to optimal value and then decreased. The values of UCS for HL and CCR-treated samples with 10% additive content increased from 1900 to 2540&#xa0;kPa and from 2540 to 3370&#xa0;kPa after 15% FA was added. The pozzolanic reaction between FA and unreacted calcium hydroxide from the CCR was the main reason for this issue. Moreover, with increasing additive content, the cohesion has increased remarkably, while the increase in internal friction angle was not significant. The conclusion of this research revealed that the utilization of CCR and FA can be used as an alternative additive for soil treatment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Evaluation of Strength Development of Fat Clay Treated with Calcium Carbide Residue, Fly Ash, and Hydrated Lime: A Comparative Study

  • 期刊论文

  • 发表日期：

    2025年10月25日

查看全文
  • Zohre Hatefi,
  • Reza Noorzad,
  • Reza Alijani Shirvani

摘要

Although previous studies have shown remarkable effects of traditional additives on enhancing the engineering properties of problematic soils, the operation of manufacturing this material has been accompanied with concerns. On the other hand, large quantities of industrial wastes and serious environmental problems caused by their dumping have stimulated researchers to seek alternative additives. Therefore, the present study investigated the effectiveness of calcium carbide residue (CCR) and fly ash (FA) to improve the physical and mechanical properties of fat clay. In this regard, hydrated lime (HL) was used as a controlling additive. For this purpose, 15 Atterberg limits, 14 compactions, 71 Unconfined compressive strength (UCS), and 15 unconsolidated-undrained triaxial tests were carried out. Results showed that the addition of HL and CCR lead to a significant reduction in the soil plasticity. By increasing the amount of additives, optimum moisture content (OMC) and maximum dry unit weight (MDUW) increased and decreased, respectively. The results varied from 22.6 to 26.8% (increase) for OMC and from 16.34 to 14.62 kN/m3 (decrease) for MDUW. Based on the results, the UCS of CCR-treated samples increased by adding FA contents up to optimal value and then decreased. The values of UCS for HL and CCR-treated samples with 10% additive content increased from 1900 to 2540 kPa and from 2540 to 3370 kPa after 15% FA was added. The pozzolanic reaction between FA and unreacted calcium hydroxide from the CCR was the main reason for this issue. Moreover, with increasing additive content, the cohesion has increased remarkably, while the increase in internal friction angle was not significant. The conclusion of this research revealed that the utilization of CCR and FA can be used as an alternative additive for soil treatment.