بانک مقالات

اشباع و محصورسازی دانه های سبک وزن برای بتن خودترمیم

Impregnation and encapsulation of lightweight aggregates for self-healing concrete

سال انتشار : 2016

تعداد صفحه : 12

کلیدواژه ها: Self-healing concrete, Impregnation, Lightweight aggregate, Sodium silicate

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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 lm 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.

زبان فایل

مجلات و ژورنال های بین المللی

Elsevier

ترجمه

نوع فایل

رایگان

سال انتشار

2016

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