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

Jamali, Armin, Mendes, Joao, Nagaratnam, Brabha and Lim, Michael (2022) A new four stage model of capillary pressure in early age concrete: Insights from high capacity tensiometers. Cement and Concrete Research, 161. p. 106955. ISSN 0008-8846

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Official URL: https://doi.org/10.1016/j.cemconres.2022.106955


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.

Item Type: Article
Additional Information: Funding information: The financial contribution of the Northumbria University Faculty of Engineering and Environment and the Northumbria University Department of Mechanical and Construction Engineering MCE QR Steering Funds are greatly acknowledged. The technical support from Phil Donnelly (Senior Technician) for the manufacture of HCT components, saturation vessels and other experimental equipment necessary to conduct the experimental program.
Uncontrolled Keywords: Capillary pressure, High capacity tensiometer, Early age shrinkage, Self-consolidating concrete, Curing duration, Shrinkage reducing admixture
Subjects: F200 Materials Science
H200 Civil Engineering
H700 Production and Manufacturing Engineering
K200 Building
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 24 Aug 2022 09:41
Last Modified: 06 Sep 2022 08:00
URI: https://nrl.northumbria.ac.uk/id/eprint/49942

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