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<p>This study investigates the usage of pumice and recycled glass waste as partial substitutes for Portland cement in mortar, to improve workability, compressive strength, Porosity, setting time, and overall sustainability. Mortar samples were made with 10%, 20%, 30%, and 40% cement replacement by weight, utilizing pumice and glass waste. Pumice improved compressive strength at 10% substitution (1360 psi at 7&#xa0;days) but reduced it by 29.4% at 40% replacement (950 psi). Glass waste increased early strength (1540 psi at 7&#xa0;days for G-10%), but higher replacements led to a 49.4% strength reduction at 40% (680 psi). Pumice reduced porosity (16.5% at P-10% after 7&#xa0;days), while glass waste increased it. Both materials extended setting times, with pumice increased by 17% and glass waste by 22.1% at 40% replacement. The findings suggest that pumice is most effective at 10–20% replacement for both early and long-term performance, whereas glass waste improves early strength at 10%, but negatively affects long-term durability. The study emphasizes the environmental benefits, such as CO<sub>2</sub> reductions, and the economic advantages of using pumice and recycled glass waste, which could decrease cement costs and make construction more sustainable and financially viable in the long term.</p>

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Performance evaluation of mortar with high-volume cement replacement using locally sourced pumice and recycled glass waste

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Muhammad Ali Wazir,
  • Zia Ul islam,
  • Hamzah Mohammed Ali,
  • Osama Wali

摘要

This study investigates the usage of pumice and recycled glass waste as partial substitutes for Portland cement in mortar, to improve workability, compressive strength, Porosity, setting time, and overall sustainability. Mortar samples were made with 10%, 20%, 30%, and 40% cement replacement by weight, utilizing pumice and glass waste. Pumice improved compressive strength at 10% substitution (1360 psi at 7 days) but reduced it by 29.4% at 40% replacement (950 psi). Glass waste increased early strength (1540 psi at 7 days for G-10%), but higher replacements led to a 49.4% strength reduction at 40% (680 psi). Pumice reduced porosity (16.5% at P-10% after 7 days), while glass waste increased it. Both materials extended setting times, with pumice increased by 17% and glass waste by 22.1% at 40% replacement. The findings suggest that pumice is most effective at 10–20% replacement for both early and long-term performance, whereas glass waste improves early strength at 10%, but negatively affects long-term durability. The study emphasizes the environmental benefits, such as CO2 reductions, and the economic advantages of using pumice and recycled glass waste, which could decrease cement costs and make construction more sustainable and financially viable in the long term.