Strengthening of masonry and concrete structures working in elevated temperatures and mining tremors area

Abstract

In this paper, comparison of behaviour of composite strengthening bonded to concrete and masonry substrate are presented. Specimens are tested in single lap shear tests under constant load and action of elevated temperatures. Obtained results showed that tested stiff epoxy adhesives are vulnerable to elevated temperatures, changing strain distribution, whereas the tested flexible polyurethane adhesive works stable in the whole tested temperature range. The carried out analysis concerns cracked industrial chimneys working in mining areas, which are strengthened with composite materials and carry thermal and dynamic loads, and can be responsible for the composite strengthening detachment.

Keywords

• Elevated temperatures
• Industrial chimneys
• Stiff and flexible adhesives
• Glass transition temperature
• Mining tremors