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The conventional method for producing pervious concrete (PC) involves balancing permeability and compressive strength, which can be complicated due to variability in voids. This study investigates combinations of two aggregate sizes (3/8″ and 3/4″) and four water-to-cement (W/C) ratios (0.30–0.39) with a constant aggregate-to-binder ratio to achieve a uniform cement paste distribution. Results showed a cement paste thickness ratio varying between 0.7 to around 1.0 across mixes. Compressive strength peaked at a W/C ratio of 0.36 for the mix with equal 3/8″ and 3/4″ aggregate, while higher strength was reached with a higher W/C ratio of 0.39 for mix with higher 3/8″ aggregate content due to better packing density. Permeability generally decreased with higher W/C ratios, while a balanced aggregate mix (50% each of 3/8″ and 3/4″) maintained higher permeability values. The study highlights the trade-offs between strength and permeability, with a W/C ratio of 0.39 being optimal for strength and 0.30 for permeability. These findings emphasize the importance W/C ratio and aggregate mix to meet specific application needs.

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Balancing Strength and Porosity: Exploring Cement Paste Distribution in Pervious Concrete with Varied Water-to-Cement Ratios and Aggregate Size Combination

  • 会议论文

  • 发表日期：

    2026年

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  • Hana Astrid R. Canseco-Tuñacao,
  • Lovely C. Casenillo,
  • Leah V. Mauring,
  • Fely D. Pableo

摘要

The conventional method for producing pervious concrete (PC) involves balancing permeability and compressive strength, which can be complicated due to variability in voids. This study investigates combinations of two aggregate sizes (3/8″ and 3/4″) and four water-to-cement (W/C) ratios (0.30–0.39) with a constant aggregate-to-binder ratio to achieve a uniform cement paste distribution. Results showed a cement paste thickness ratio varying between 0.7 to around 1.0 across mixes. Compressive strength peaked at a W/C ratio of 0.36 for the mix with equal 3/8″ and 3/4″ aggregate, while higher strength was reached with a higher W/C ratio of 0.39 for mix with higher 3/8″ aggregate content due to better packing density. Permeability generally decreased with higher W/C ratios, while a balanced aggregate mix (50% each of 3/8″ and 3/4″) maintained higher permeability values. The study highlights the trade-offs between strength and permeability, with a W/C ratio of 0.39 being optimal for strength and 0.30 for permeability. These findings emphasize the importance W/C ratio and aggregate mix to meet specific application needs.