Investigation of high strain rate and low temperature effects on the compressive behaviour of concrete
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Date
2019
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University of New Brunswick
Abstract
Temperature and strain rate are important factors when considering the mechanical properties of materials, as they can greatly influence the material behaviour. This thesis presents an experimental investigation used to determine the effects of low temperatures and high strain rates on the compressive behaviour of concrete. Experimental stress-strain curves of concrete exposed to these conditions together and independently were produced and predictive mechanical property equations for engineers to use in structural design are presented. Concrete specimens were loaded either under typical static conditions or dynamic conditions by a drop mass impactor that produced average strain rates of 1 s-1 while being exposed to various temperature groups from 20 °C to −70 °C. It was found that the compressive strength and modulus of elasticity of concrete increased due to the combined temperature and dynamic loading conditions, while the peak strain decreased due to dynamic loads and was unaffected by temperature changes.