A new four stage model of capillary pressure in early age concrete: Insights from high capacity tensiometers

Armin Jamali*, Joao Mendes, Brabha Nagaratnam, Michael Lim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Capillary pressure is frequently measured to evaluate the shrinkage performance of concrete but has been limited to pressures <100 kPa preventing a better understanding of the early age factors affecting concrete durability. In this study, high capacity tensiometers (HCTs) were employed for the first time to investigate the behavior of early age concrete. The evolution of capillary pressure in Self-Consolidating Concrete (SCC) with and without shrinkage reducing admixture was evaluated. The results demonstrate that HCTs are capable of measuring capillary pressure beyond 1500 kPa. This transformative new record of capillary pressure behavior has enabled the development of a model for the capillary pressure in early age concrete correlated to water evaporation, self-desiccation, setting time, temperature, and hydration processes. This ability to quantify real-time capillary pressure change in concrete generates important implications for optimizing the commercial durability of SCC and for understanding the link between early age concrete processes and resultant mechanical performance.
Original languageEnglish
Article number106955
Number of pages12
JournalCement and Concrete Research
Volume161
Early online date27 Aug 2022
DOIs
Publication statusE-pub ahead of print - 27 Aug 2022

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