CUED Publications database

Impregnation and encapsulation of lightweight aggregates for self-healing concrete

Alghamri, R and Kanellopoulos, A and Al-Tabbaa, A (2016) Impregnation and encapsulation of lightweight aggregates for self-healing concrete. Construction and Building Materials, 124. pp. 910-921.

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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.

Item Type: Article
Uncontrolled Keywords: self-healing concrete impregnation lightweight aggregate sodium silicate
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:08
Last Modified: 10 Aug 2017 01:37
DOI: