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

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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