Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 124, Issue -, Pages 910-921Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.07.143
Keywords
Self-healing concrete; Impregnation; Lightweight aggregate; Sodium silicate
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Funding
- Yousef Jameel Foundation through Cambridge Commonwealth, European & International Trust
- Engineering and Physical Sciences Research Council (EPSRC - United Kingdom) [EP/K026631/1]
- Engineering and Physical Sciences Research Council [EP/K026631/1] Funding Source: researchfish
- EPSRC [EP/K026631/1] Funding Source: UKRI
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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 mu m 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 similar to 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. (C) 2016 The Author(s). Published by Elsevier Ltd.
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