Scholarlink

<p>The present study evaluates the impact of nano-zinc oxide (NZ) on the fresh, mechanical, durability properties of concrete using Response Surface Methodology (RSM). NZ was added at 0–1% with a consistent water-to-binder ratio. The results suggest that slump decreases as the NZ content increases, which is indicative of a higher surface area and water demand. Mechanical characteristics improved up to 0.75% NZ, with compressive strength rising 13.38% above the control mix. Durability improved, with sorptivity reducing to 0.0316&#xa0;mm/s<sup>0.5</sup> and water absorption to 0.15% after 90&#xa0;days. The Ultrasonic Pulse Velocity (UPV) increased to 4.93&#xa0;km/s, suggesting that the internal compactness and homogeneity increased. The chloride diffusion underwent a significant improvement, as the ionic conductivity decreased from 1.6 to 0.7 mS/cm and the chloride flux decreased from 12.7 to 3–4 × 10⁻⁶ mol/cm<sup>2</sup>/s. The effective migration coefficient dropped an order of magnitude, increasing estimated service life from 4.0 to 6.8&#xa0;years. At 1% NZ, however, agglomeration effects caused a small drop in efficiency. RSM analysis verified the nonlinear behavior and concluded that the optimal NZ range for obtaining a balance between strength and durability is 0.75% of NZ.</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

Durability enhancement and structural performance of nano-ZnO modified PPC concrete: a response surface study

  • 期刊论文

  • 发表日期：

    2026年6月15日

查看全文
  • Niraj Kumar Gupta,
  • Yogesh Iyer Murthy

摘要

The present study evaluates the impact of nano-zinc oxide (NZ) on the fresh, mechanical, durability properties of concrete using Response Surface Methodology (RSM). NZ was added at 0–1% with a consistent water-to-binder ratio. The results suggest that slump decreases as the NZ content increases, which is indicative of a higher surface area and water demand. Mechanical characteristics improved up to 0.75% NZ, with compressive strength rising 13.38% above the control mix. Durability improved, with sorptivity reducing to 0.0316 mm/s0.5 and water absorption to 0.15% after 90 days. The Ultrasonic Pulse Velocity (UPV) increased to 4.93 km/s, suggesting that the internal compactness and homogeneity increased. The chloride diffusion underwent a significant improvement, as the ionic conductivity decreased from 1.6 to 0.7 mS/cm and the chloride flux decreased from 12.7 to 3–4 × 10⁻⁶ mol/cm2/s. The effective migration coefficient dropped an order of magnitude, increasing estimated service life from 4.0 to 6.8 years. At 1% NZ, however, agglomeration effects caused a small drop in efficiency. RSM analysis verified the nonlinear behavior and concluded that the optimal NZ range for obtaining a balance between strength and durability is 0.75% of NZ.