Relationship between Porosity & Compressive Strength of Concrete with Variable W/C Ratio

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Orawan Jantasuto
Narongchai Wiwattanachang
Narongdet Youngsukasem


This research used a comprehensive experimental program. The objective of this research was to quantify and investigate the correlation between effective porosity and compressive strength of concrete developed during the curing process. Compressive strength and porosity of concrete were tested at ages of 1, 3, 7, 14, 28, and 56 days, respectively and concrete cylinder samples were prepared with different water to cement (w/c) ratio of 0.40, 0.55 and 0.70. The hardening concrete's compressive strength was increased with curing time, while effective porosity measurements was in opposite pattern.The relationship between effective porosity and compressive strength of concrete has been as an empirical correlation. The time-dependent measurements are beneficial in better understanding in term of hardening concrete's pore structure development.

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