Effect of vibration duration on strength and permeability of pervious concrete with recycled aggregate and low-carbon cements.

Microscopically determined porosity showed a moderate correlation with the other methods but did not reach statistical significance ( p > 0.05), which may be due to a smaller dataset or greater variability in the measurement cross-sections.

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A clear trend is observed: as porosity increases, compressive strength decreases from approximately 25–10 MPa, while the filtration coefficient increases from approximately 0.4–1.8 cm/s.

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