Scholarlink

<p>This study investigates the synergistic effects of partially replacing Ordinary Portland Cement (OPC) with natural zeolite (NZ) and microsilica (MS) on the rheology, stability, and mechanical properties of geotechnical grouts. A comprehensive evaluation of ternary NZ-MS-PCE interactions was performed across 21 formulations at a constant water-to-cementitious-material (W/CM) ratio of 0.5. Key parameters, including Herschel-Bulkley rheology, bleeding, setting times, and compressive strength (3–90&#xa0;days), were assessed. Results showed the Herschel-Bulkley model accurately describes non-linear flow behavior (average R<sup>2</sup> &gt; 0.97, compared to R<sup>2</sup> ≈ 0.88 for the Bingham model). MS substantially increased viscosity (up to 230-fold at 40% replacement), limiting the effectiveness of the fixed 1% polycarboxylate ether (PCE) dosage, while NZ-MS synergy eliminated bleeding in optimized ternary blends (e.g., NZ7/MS7 achieved zero bleeding at 15% total SCM). Mechanically, MS enhanced early-age strength, and NZ supported long-term development, yielding superior performance in 20–40% total SCM ternary formulations (up to 55% strength gain over control). Additionally, optimized blends reduced CO<sub>2</sub> emissions by up to 39% and improved cost efficiency by 38%, enhancing sustainability. For permeation grouting in fine-grained soils, viscosities of 50–200&#xa0;mPa s are recommended, while higher-strength blends (e.g., NZ10/MS10) suit structural applications like micropiles and soil nailing. Multi-objective optimization identified optimal SCM contents (e.g., 16.88% NZ and 20.68% MS) for balanced performance. High-accuracy non-linear regression models (R<sup>2</sup> &gt; 0.97) provide predictive tools for grout design. This research advances grout technology through targeted SCM synergy, enhancing performance and sustainability in geotechnical engineering projects.</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

Predictive Modeling and Optimization of Zeolite–Microsilica Cementitious Grouts for Geotechnical Ground Improvement

  • 期刊论文

  • 发表日期：

    2025年11月18日

查看全文
  • Maedeh Akhavan Tavakkoli,
  • Alireza Ardakani,
  • Afshin Kordnaiej

摘要

This study investigates the synergistic effects of partially replacing Ordinary Portland Cement (OPC) with natural zeolite (NZ) and microsilica (MS) on the rheology, stability, and mechanical properties of geotechnical grouts. A comprehensive evaluation of ternary NZ-MS-PCE interactions was performed across 21 formulations at a constant water-to-cementitious-material (W/CM) ratio of 0.5. Key parameters, including Herschel-Bulkley rheology, bleeding, setting times, and compressive strength (3–90 days), were assessed. Results showed the Herschel-Bulkley model accurately describes non-linear flow behavior (average R2 > 0.97, compared to R2 ≈ 0.88 for the Bingham model). MS substantially increased viscosity (up to 230-fold at 40% replacement), limiting the effectiveness of the fixed 1% polycarboxylate ether (PCE) dosage, while NZ-MS synergy eliminated bleeding in optimized ternary blends (e.g., NZ7/MS7 achieved zero bleeding at 15% total SCM). Mechanically, MS enhanced early-age strength, and NZ supported long-term development, yielding superior performance in 20–40% total SCM ternary formulations (up to 55% strength gain over control). Additionally, optimized blends reduced CO2 emissions by up to 39% and improved cost efficiency by 38%, enhancing sustainability. For permeation grouting in fine-grained soils, viscosities of 50–200 mPa s are recommended, while higher-strength blends (e.g., NZ10/MS10) suit structural applications like micropiles and soil nailing. Multi-objective optimization identified optimal SCM contents (e.g., 16.88% NZ and 20.68% MS) for balanced performance. High-accuracy non-linear regression models (R2 > 0.97) provide predictive tools for grout design. This research advances grout technology through targeted SCM synergy, enhancing performance and sustainability in geotechnical engineering projects.