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Wednesday, 16 October 2019
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Raw materials & technologies, Technologies

Impregnation and encapsulation of lightweight aggregates for self-healing concrete

Monday, 22 August 2016

A 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.

Impregnation and encapsulation of lightweight aggregates for self-healing concrete. Source: Norbert Lorenz/pixelio.de

Impregnation and encapsulation of lightweight aggregates for self-healing concrete. Source: Norbert Lorenz/pixelio.de

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.

Remarkable strength regain

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.

The study is published in: Construction and Building Materials, Volume 124, 15 October 2016, Pages 910–921

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