Pore properties and moisture loss of repair mortars under low-impact microwave curing

ABUBAKRI, Shahriar, MANGAT, Pritpal, GRIGORIADIS, Konstantinos and STARINIERI, Vincenzo (2024). Pore properties and moisture loss of repair mortars under low-impact microwave curing. International Journal of Building Pathology and Adaptation.

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Abstract

Microwave curing (MC) can facilitate rapid concrete repair in cold climates without using conventional accelerated curing technologies which are environmentally unsustainable. Accelerated curing of concrete under MC can contribute to the decarbonization of the environment and provide economies in construction in several ways such as reducing construction time, energy efficiency, lower cement content, lower carbonation risk, and reducing emissions from equipment. The paper investigates moisture loss and pore properties of six cement-based proprietary concrete repair materials subjected to MC. The impact of MC on these properties is critically important for its successful implementation in practice and current literature lacks this information. Specimens were microwave cured for 40-45 minutes to surface temperatures between 39.9 and 44.1 °C. The fast-setting repair material was microwave cured for 15 minutes to 40.7 °C. MC causes a higher water loss which shows the importance of preventing drying during MC and the following 24 hours. Portland cement-based normal density repair mortars, including materials incorporating fly ash and polymer latex, benefit from the thermal effect of MC on hydration, resulting in up to 24% reduction in porosity relative to normal curing. Low density and flowing repair materials suffer an increase in porosity up to 16% due to MC. The moisture loss at the end of microwave curing and after 24h is related to the mix water content and porosity respectively.

Item Type: Article
Uncontrolled Keywords: 3302 Building
Identification Number: https://doi.org/10.1108/ijbpa-09-2023-0133
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 19 Mar 2024 15:59
Last Modified: 26 Mar 2024 12:00
URI: https://shura.shu.ac.uk/id/eprint/33447

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