Scholarlink

<p>The emergency repair of base and subbase structures in large-volume engineering projects presents significant challenges in terms of materials and construction techniques. To address these challenges, this study introduces a novel ultra-early-strength geopolymer (UESG) grouting material and a layer-by-layer gravel filling and infiltration grouting (LLGF-IG) construction technique. Unlike conventional materials, the UESG grouting material offers superior flowability, rapid setting, and high early strength, making it particularly suitable for emergency repair scenarios. This study successfully resolves the contradiction between construction performance (flowability) and functional indicator (early strength) through formulation optimization and performance regulation. While maintaining high strength of the material, excellent flowability is ensured. Laboratory tests were conducted to optimize the UESG mixture proportions, focusing on pH value, setting time, flowability, and mechanical properties. The grouting quality was evaluated through on-site LLGF-IG construction, employing visual examination, strength test of core-drilling specimens, and X-ray computed tomography (XCT) to analyze the distribution of gravels, UESG skeletons, and pores/defects. The results demonstrated that the optimal UESG achieved a flowability of 200&#xa0;mm, an initial setting time of 30&#xa0;min, a final setting time of 37&#xa0;min, and a 1-h compressive strength of 2.2&#xa0;MPa. Core-drilling specimens exhibited tight aggregate-matrix bonding and a high compressive strength of 36.5&#xa0;MPa. XCT analysis revealed no significant interlayer spaces and a relatively homogeneous spatial distribution of pores across five segments. The study also identified the formation of interfacial transition zones (ITZs) and weak phases, primarily attributed to the natural flow behavior of slurries and air retention in inter-particle spaces. These findings highlight the practical advantages of the UESG material and LLGF-IG technique for rapid road repairs, offering a significant improvement over traditional methods in terms of efficiency, strength, and reliability. This research provides a robust foundation for the application of UESG-based solutions in emergency repair engineering.</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

An on-site test investigation on ultra-early-strength infiltration grouting geopolymer for rapid road repair

  • 期刊论文

  • 发表日期：

    2025年8月20日

查看全文
  • Beifeng Lv,
  • Lizhong Wang,
  • Qiang Zeng,
  • Zhen Guo

摘要

The emergency repair of base and subbase structures in large-volume engineering projects presents significant challenges in terms of materials and construction techniques. To address these challenges, this study introduces a novel ultra-early-strength geopolymer (UESG) grouting material and a layer-by-layer gravel filling and infiltration grouting (LLGF-IG) construction technique. Unlike conventional materials, the UESG grouting material offers superior flowability, rapid setting, and high early strength, making it particularly suitable for emergency repair scenarios. This study successfully resolves the contradiction between construction performance (flowability) and functional indicator (early strength) through formulation optimization and performance regulation. While maintaining high strength of the material, excellent flowability is ensured. Laboratory tests were conducted to optimize the UESG mixture proportions, focusing on pH value, setting time, flowability, and mechanical properties. The grouting quality was evaluated through on-site LLGF-IG construction, employing visual examination, strength test of core-drilling specimens, and X-ray computed tomography (XCT) to analyze the distribution of gravels, UESG skeletons, and pores/defects. The results demonstrated that the optimal UESG achieved a flowability of 200 mm, an initial setting time of 30 min, a final setting time of 37 min, and a 1-h compressive strength of 2.2 MPa. Core-drilling specimens exhibited tight aggregate-matrix bonding and a high compressive strength of 36.5 MPa. XCT analysis revealed no significant interlayer spaces and a relatively homogeneous spatial distribution of pores across five segments. The study also identified the formation of interfacial transition zones (ITZs) and weak phases, primarily attributed to the natural flow behavior of slurries and air retention in inter-particle spaces. These findings highlight the practical advantages of the UESG material and LLGF-IG technique for rapid road repairs, offering a significant improvement over traditional methods in terms of efficiency, strength, and reliability. This research provides a robust foundation for the application of UESG-based solutions in emergency repair engineering.