Scholarlink

<p>The growing need for sustainable construction materials and the challenges associated with the durability of conventional concrete in aggressive environments have driven interest in alternative aggregate solutions. The present study investigates the usage of geopolymer aggregate (GPA), synthesized from ground granulated blast furnace slag (GGBS) and an alkaline solution, as a substitution for natural coarse aggregate in concrete. Concrete mixtures were prepared with varying levels of GPA replacement (25%, 50%, 75%, and 100%) and tested for workability, compressive strength, flexural strength, chloride resistance, sulfate resistance, sorptivity, and water absorption. Results revealed significant enhancements in mechanical properties, with compressive strength ranging from 31 to 38&#xa0;MPa, indicating a 22.5% increase, and flexural strength enhancements of 7.5% at 28 days, respectively. These gains were attributed to GPA’s rough and elongated particle morphology. Durability indicators also improved: GPA concrete exhibited 42.58% lower water absorption and 47.9% lower sorptivity compared to conventional concrete. In aggressive environments, GPA concrete showed better resistance, with a 28.6% reduction in weight and strength loss due to acid exposure and 31% improvement under sulfate attack. Overall, the integration of GPA not only improves concrete performance but also supports sustainable practices by utilizing industrial by-products. Its superior resistance to deterioration makes it a promising material for structural rehabilitation and long-term durability in pathological building conditions.</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

Influence of geopolymer aggregate on the durability, mechanical characteristics and chemical properties of concrete

  • 期刊论文

  • 发表日期：

    2025年7月5日

查看全文
  • T. Udhaya Kumar,
  • M. Vinod Kumar

摘要

The growing need for sustainable construction materials and the challenges associated with the durability of conventional concrete in aggressive environments have driven interest in alternative aggregate solutions. The present study investigates the usage of geopolymer aggregate (GPA), synthesized from ground granulated blast furnace slag (GGBS) and an alkaline solution, as a substitution for natural coarse aggregate in concrete. Concrete mixtures were prepared with varying levels of GPA replacement (25%, 50%, 75%, and 100%) and tested for workability, compressive strength, flexural strength, chloride resistance, sulfate resistance, sorptivity, and water absorption. Results revealed significant enhancements in mechanical properties, with compressive strength ranging from 31 to 38 MPa, indicating a 22.5% increase, and flexural strength enhancements of 7.5% at 28 days, respectively. These gains were attributed to GPA’s rough and elongated particle morphology. Durability indicators also improved: GPA concrete exhibited 42.58% lower water absorption and 47.9% lower sorptivity compared to conventional concrete. In aggressive environments, GPA concrete showed better resistance, with a 28.6% reduction in weight and strength loss due to acid exposure and 31% improvement under sulfate attack. Overall, the integration of GPA not only improves concrete performance but also supports sustainable practices by utilizing industrial by-products. Its superior resistance to deterioration makes it a promising material for structural rehabilitation and long-term durability in pathological building conditions.