Engineering Mechanics Institute Conference 2013

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Compressive Behavior of UHPC Exposed to High Temperatures

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Kay Wille
University of Connecticut
United States

Richard Way
University of Connecticut
United States

Abstract:
The objective of this research is to investigate and quantify the chemical material degradation of one commercially available ultra-high performance concrete (UHPC) mix and one non-proprietary UHPC exposed to high temperatures. UHPC undergoes chemical changes and physical damages under elevated temperature. The UHPC’s high particle packing density unfavorably leads to the development of a vapor barrier, which damages the matrix and results in significant strength reduction. In order to separate these physical damages from chemical decomposition, the specimens have been dried for about 4 weeks at 135°C, followed by very slow increase to the target temperature ranging from 90°C to 900°C. After being exposed to high temperature the specimens have been cooled down slowly and tested at ambient temperature. Their temperature dependent residual compressive stress-strain behavior has been analyzed in terms of strength, elastic modulus and strain-capacity at peak load. Bilinear equations are modeled to predict the temperature dependent mechanical behavior under compression.
Additionally thermo-gravitational analyses and differential scanning calorimetry have been performed to quantify the chemical and physico-chemical changes up to 1000°C.
The long-term goal of this research is to successfully apply UHPC solely or in composition with common steel reinforcement in tunnel linings with potential cost reduction in comparison to conventional methods.

 

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