Scholarlink

<p>Environmental challenges in today’s world are becoming increasingly critical. The construction of artificial structures significantly contributes to environmental pollution, releasing substantial waste, carbon dioxide, and other toxic gases. These emissions are rapidly increasing in the construction industry to meet rising demand. Utilizing waste materials like Ground Granulated Blast Furnace Slag (GGBS), a byproduct of iron production, and bentonite powder, formed from volcanic ash weathering, provides sustainable alternatives for reducing environmental pollution. Using these materials reduces dependence on cement, significantly lowering CO₂ emissions from its production, while simultaneously promoting sustainability and improving construction practices. The primary objective of this research is to evaluate the combined effectiveness of bentonite and GGBS on the strength and durability properties of M30 grade concrete. In this study, cement is partially replaced with bentonite at proportions of 0%, 5%, 10%, 15%, 20%, and 25%, and with GGBS at proportions of 50%, 45%, 40%, 35%, 30%, and 25%. The concrete mix maintains a constant 50% cement content with 0.45 w/c ratio, while the percentages of GGBS and bentonite varies accordingly. This research examines mortar performance changes through an assessment of uncarbonated mortar cube properties and properties of cubes subjected to carbonation treatment shows 45&#xa0;MPa for 10&#xa0;h for mortars and 48&#xa0;MPa for concrete. Also evaluated the fresh properties, physical, chemical and mechanical properties of mortar and concrete as well as microstructural properties by using Scanning Electron Microscopy (SEM) revealed a refined matrix with needle-like structures in the modified mix. Pore structure of concrete analyzed using electrochemical impedance spectroscopy and derivation of AC conductivity shows 4.0 × 10⁻⁵ Ω⁻¹ for optimized mix at day 17, Rebound hammer was used to estimate the surface hardness and the value was read as 35 and the quality was measured using the Ultrasonic Pulse Velocity (UPV) which recorded a value of 4434&#xa0;m/s at the optimum mix.</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

Utilizing bentonite in concrete as partial replacement of cement: impact of carbonation and pore structure evaluation using EIS and AC conductivity analysis

  • 期刊论文

  • 发表日期：

    2025年7月28日

查看全文
  • B. Narendra Kumar,
  • A. Meghanadha Reddy

摘要

Environmental challenges in today’s world are becoming increasingly critical. The construction of artificial structures significantly contributes to environmental pollution, releasing substantial waste, carbon dioxide, and other toxic gases. These emissions are rapidly increasing in the construction industry to meet rising demand. Utilizing waste materials like Ground Granulated Blast Furnace Slag (GGBS), a byproduct of iron production, and bentonite powder, formed from volcanic ash weathering, provides sustainable alternatives for reducing environmental pollution. Using these materials reduces dependence on cement, significantly lowering CO₂ emissions from its production, while simultaneously promoting sustainability and improving construction practices. The primary objective of this research is to evaluate the combined effectiveness of bentonite and GGBS on the strength and durability properties of M30 grade concrete. In this study, cement is partially replaced with bentonite at proportions of 0%, 5%, 10%, 15%, 20%, and 25%, and with GGBS at proportions of 50%, 45%, 40%, 35%, 30%, and 25%. The concrete mix maintains a constant 50% cement content with 0.45 w/c ratio, while the percentages of GGBS and bentonite varies accordingly. This research examines mortar performance changes through an assessment of uncarbonated mortar cube properties and properties of cubes subjected to carbonation treatment shows 45 MPa for 10 h for mortars and 48 MPa for concrete. Also evaluated the fresh properties, physical, chemical and mechanical properties of mortar and concrete as well as microstructural properties by using Scanning Electron Microscopy (SEM) revealed a refined matrix with needle-like structures in the modified mix. Pore structure of concrete analyzed using electrochemical impedance spectroscopy and derivation of AC conductivity shows 4.0 × 10⁻⁵ Ω⁻¹ for optimized mix at day 17, Rebound hammer was used to estimate the surface hardness and the value was read as 35 and the quality was measured using the Ultrasonic Pulse Velocity (UPV) which recorded a value of 4434 m/s at the optimum mix.