Scholarlink

<p>In response to global freshwater scarcity and the environmental challenges of concrete production, this study pioneers a sustainable approach by fully replacing tap water with concrete wash water (CWW) in cement pastes and mortars. Wash water was simulated by mixing cement with water at a 5:1&#xa0;W/C ratio and allowing it to rest. Unlike prior research which often did not adjust for wash water solids or focused on a limited scope, this study systematically explores the influence of water-to-binder (W/B) ratios—0.4, 0.5, and 0.6—on both cement pastes and mortars, with fresh binder content meticulously adjusted to maintain consistent W/B ratios and isolate the effects of CWW solids. This novel methodology reveals that CWW accelerates cement hydration, reducing flowability by 2–10%, with the greatest impact at W/B = 0.4. In cement pastes, compressive strength decreased by approximately 5% compared to tap water controls across the W/B ratios tested at 28 days. For mortars, those with W/B = 0.4 exhibited a notable 28-day compressive strength reduction of approximately 17% (from ~ 30&#xa0;MPa to ~ 25&#xa0;MPa). Conversely, at W/B = 0.6, CWW mortars achieved 28-day compressive strengths (~ 42&#xa0;MPa) that were comparable to, albeit slightly lower than, tap water samples (~ 45&#xa0;MPa), a difference considered practically equivalent for general applications. These findings demonstrate CWW’s potential as a viable, eco-friendly alternative, particularly in high-W/B applications, advancing sustainable construction practices by reducing freshwater use and waste.</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

Utilising Concrete Wash Water to Produce Cement Pastes and Mortars: Effect of Water-to-Binder Ratios

  • 期刊论文

  • 发表日期：

    2025年7月7日

查看全文
  • Tuan Minh Ha,
  • Hong-Ba-Thi Dinh,
  • Truong-Van Dao,
  • Ba-Tung Pham

摘要

In response to global freshwater scarcity and the environmental challenges of concrete production, this study pioneers a sustainable approach by fully replacing tap water with concrete wash water (CWW) in cement pastes and mortars. Wash water was simulated by mixing cement with water at a 5:1 W/C ratio and allowing it to rest. Unlike prior research which often did not adjust for wash water solids or focused on a limited scope, this study systematically explores the influence of water-to-binder (W/B) ratios—0.4, 0.5, and 0.6—on both cement pastes and mortars, with fresh binder content meticulously adjusted to maintain consistent W/B ratios and isolate the effects of CWW solids. This novel methodology reveals that CWW accelerates cement hydration, reducing flowability by 2–10%, with the greatest impact at W/B = 0.4. In cement pastes, compressive strength decreased by approximately 5% compared to tap water controls across the W/B ratios tested at 28 days. For mortars, those with W/B = 0.4 exhibited a notable 28-day compressive strength reduction of approximately 17% (from ~ 30 MPa to ~ 25 MPa). Conversely, at W/B = 0.6, CWW mortars achieved 28-day compressive strengths (~ 42 MPa) that were comparable to, albeit slightly lower than, tap water samples (~ 45 MPa), a difference considered practically equivalent for general applications. These findings demonstrate CWW’s potential as a viable, eco-friendly alternative, particularly in high-W/B applications, advancing sustainable construction practices by reducing freshwater use and waste.