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Impregnation and encapsulation of lightweight aggregates for self-healing concrete


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Publication Date: 2016-10-15

Journal Title: Construction and Building Materials

Publisher: Elsevier

Volume: 124

Pages: 910-921

Language: English

Type: Article

This Version: VoR

Metadata: Show full item record

Citation: Alghamri, R., Kanellopoulos, A., & Al-Tabbaa, A. (2016). Impregnation and encapsulation of lightweight aggregates for self-healing concrete. Construction and Building Materials, 124 910-921. https://doi.org/10.1016/j.conbuildmat.2016.07.143

Abstract: This study investigated a technique of impregnating potential self-healing agents into lightweight aggregates (LWA) and the self-healing performance of concrete mixed with the impregnated LWA. Lightweight aggregates with a diameter range of 4–8 mm were impregnated with a sodium silicate solution as a potential self-healing agent. Concrete specimens containing the impregnated LWA and control specimens were pre-cracked up to 300 μm crack width at 7 days. Flexural strength recovery and reduction in water sorptivity were examined. After 28 days healing in water, the specimens containing the impregnated LWA showed ∼80% recovery of the pre-cracking strength, which accounts more than five times of the control specimens’ recovery. The capillary water absorption was also significantly improved; the specimens healed with the impregnated LWA showed a 50% reduction in the sorptivity index compared with the control cracked specimens and a very similar response to the control uncracked specimens. The contribution of sodium silicate in producing more calcium silicate hydrate gel was confirmed by characterisation the healing products using X-ray diffraction, Fourier transform spectroscopy, and scanning electron microscopy.

Keywords: self-healing concrete, impregnation, lightweight aggregate, sodium silicate

Relationships: Is supplemented by: https://doi.org/10.17863/CAM.44

Sponsorship: Yousef Jameel Foundation through Cambridge Commonwealth, European & International Trust, Engineering and Physical Sciences Research Council (Project Ref. EP/K026631/1 – ‘‘Materials for Life”)

Embargo Lift Date: 2100-01-01

Identifiers:

External DOI: https://doi.org/10.1016/j.conbuildmat.2016.07.143

This record's URL: https://www.repository.cam.ac.uk/handle/1810/260223



Rights: Attribution 4.0 International

Licence URL: http://creativecommons.org/licenses/by/4.0/





Author: Alghamri, RKanellopoulos, AAl-Tabbaa, A

Source: https://www.repository.cam.ac.uk/handle/1810/260223



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