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<p>The increasing generation of agricultural waste poses significant environmental challenges while offering opportunities for sustainable construction solutions. This study addresses the pressing need to reduce the carbon footprint of cement production by utilizing wheat straw ash (WSA), an agricultural byproduct, as a partial cement replacement (WSA), in pervious concrete. The primary objective is to evaluate the influence of varying WSA replacement levels (0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%) on the physical, mechanical, and durability properties of pervious concrete, using a cement-to-aggregate ratio of 1:6, superplasticizer (1% by cement weight), and two coarse aggregate sizes (12.5&#xa0;mm and 20&#xa0;mm). Experimental results indicated that a 5% WSA replacement enhanced compressive strength at 90 days due to pozzolanic activity. However, strength gradually declined at higher replacement levels, suggesting a limit to the beneficial use of WSA. The findings conclude that low-level incorporation of WSA (up to 5%) is effective in maintaining or slightly improving strength and durability, while significantly contributing to waste valorization. This study recommends adopting low-level incorporation of WSA (up to 5%) as a sustainable partial cement substitute in non-structural and permeable pavement applications, promoting waste valorization, reducing cement consumption, and contributing to circular economy practices in construction.</p>

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Effect of wheat straw ash and aggregate size on the properties of sustainable pervious concrete

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Omar Hazim,
  • Hussein Hamada,
  • Alyaa Al-Attar,
  • Ali Majdi

摘要

The increasing generation of agricultural waste poses significant environmental challenges while offering opportunities for sustainable construction solutions. This study addresses the pressing need to reduce the carbon footprint of cement production by utilizing wheat straw ash (WSA), an agricultural byproduct, as a partial cement replacement (WSA), in pervious concrete. The primary objective is to evaluate the influence of varying WSA replacement levels (0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%) on the physical, mechanical, and durability properties of pervious concrete, using a cement-to-aggregate ratio of 1:6, superplasticizer (1% by cement weight), and two coarse aggregate sizes (12.5 mm and 20 mm). Experimental results indicated that a 5% WSA replacement enhanced compressive strength at 90 days due to pozzolanic activity. However, strength gradually declined at higher replacement levels, suggesting a limit to the beneficial use of WSA. The findings conclude that low-level incorporation of WSA (up to 5%) is effective in maintaining or slightly improving strength and durability, while significantly contributing to waste valorization. This study recommends adopting low-level incorporation of WSA (up to 5%) as a sustainable partial cement substitute in non-structural and permeable pavement applications, promoting waste valorization, reducing cement consumption, and contributing to circular economy practices in construction.