Scholarlink

<p>This study elucidates the early-age reaction mechanisms governing strength development in ceramic waste powder (CWP) concrete activated with 6% potassium silicate (K₂SiO₃) solution. Microstructural evolution at three cement replacement levels (0%, 15%, 30%) was investigated through SEM–EDS analysis coupled with 7-day mechanical testing. Progressive pozzolanic activation was confirmed by decreasing Ca/Si ratios from 4.51 in control specimens to 2.61 at 15% CWP and 0.92 at 30% CWP replacement. Optimal strength development occurred at 15% CWP, achieving 7-day compressive strength of 42.05&#xa0;MPa compared to 38.86&#xa0;MPa for control specimens, with flexural strength reaching 5.90&#xa0;MPa versus 5.70&#xa0;MPa and split tensile strength of 5.33&#xa0;MPa versus 4.20&#xa0;MPa. At this replacement level, Ca/Si ratios approached ideal C-S–H stoichiometry (1.5–2.0) with balanced microstructural heterogeneity. EDS mapping revealed potassium silicate activation enhanced aluminosilicate dissolution, promoting C-A-S–H gel formation through localized Si enrichment and K-ion distribution at reaction interfaces. The 30% replacement level exhibited excessive microstructural heterogeneity, compromising mechanical performance despite continued pozzolanic activity. These findings demonstrate that controlled potassium silicate activation enables effective partial cement replacement with CWP, providing mechanistic insights for developing sustainable alternatives to conventional sodium-based activation systems while maintaining early strength requirements critical for construction applications.</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

Early-Age Strength Development and Microstructural Evolution in Potassium Silicate-Activated Ceramic Waste Concrete

  • 期刊论文

  • 发表日期：

    2025年12月4日

查看全文
  • Amit Mandal,
  • Sarvesh P. S. Rajput

摘要

This study elucidates the early-age reaction mechanisms governing strength development in ceramic waste powder (CWP) concrete activated with 6% potassium silicate (K₂SiO₃) solution. Microstructural evolution at three cement replacement levels (0%, 15%, 30%) was investigated through SEM–EDS analysis coupled with 7-day mechanical testing. Progressive pozzolanic activation was confirmed by decreasing Ca/Si ratios from 4.51 in control specimens to 2.61 at 15% CWP and 0.92 at 30% CWP replacement. Optimal strength development occurred at 15% CWP, achieving 7-day compressive strength of 42.05 MPa compared to 38.86 MPa for control specimens, with flexural strength reaching 5.90 MPa versus 5.70 MPa and split tensile strength of 5.33 MPa versus 4.20 MPa. At this replacement level, Ca/Si ratios approached ideal C-S–H stoichiometry (1.5–2.0) with balanced microstructural heterogeneity. EDS mapping revealed potassium silicate activation enhanced aluminosilicate dissolution, promoting C-A-S–H gel formation through localized Si enrichment and K-ion distribution at reaction interfaces. The 30% replacement level exhibited excessive microstructural heterogeneity, compromising mechanical performance despite continued pozzolanic activity. These findings demonstrate that controlled potassium silicate activation enables effective partial cement replacement with CWP, providing mechanistic insights for developing sustainable alternatives to conventional sodium-based activation systems while maintaining early strength requirements critical for construction applications.