United States Nuclear Regulatory Commission - Protecting People and the Environment

A Compilation of Elevated Temperature Concrete Material Property Data and Information for Use in Assessments of Nuclear Power Plant Reinforced Concrete Structures (NUREG/CR-7031)

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Publication Information

Manuscript Completed: October 2010
Date Published: December 2010

Prepared by:
D.J. Naus

Oak Ridge National Laboratory
Managed by UT-Battelle, LLC
Oak Ridge, TN 37831-6283

H.L. Graves, NRC Project Manager

NRC Job Code N6511

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Abstract

The objective of this limited study was to provide a compilation of data and information on the affects of elevated temperature on the behavior of concrete materials for use in assessments of nuclear power plant reinforced concrete structures that are subjected temperatures in excess of the current American Society of Mechanical Engineers Code limitations. In meeting this objective the physicochemical processes in Portland cement concrete as a function of temperature are noted. The general behavior of Portland cement, aggregate, and concrete materials under elevated temperatures is summarized. Data and information on the affect of elevated temperature and testing conditions on the mechanical and physical properties of concrete are presented. Mechanical property-related items addressed include: stress and strain characteristics, Poisson’s ratio, modulus of elasticity, compressive strength, thermal cycling, tensile strength, shrinkage and creep, concrete-steel reinforcement bond strength, fracture energy and fracture toughness, long-term exposure, radiation shielding effectiveness, and multiaxial conditions. Physical properties and thermal effects addressed include: porosity and density, coefficient of thermal expansion, thermal conductivity, thermal diffusivity, specific heat, heat of ablation and erosion rates, moisture diffusion and pore pressure, and simulated hot spots. A general description of heavyweight concrete materials utilized for radiation shielding is provided and the affect of elevated temperature on properties of several shielding concretes is identified. Design codes and standards that address concrete under elevated temperature conditions are described. Examples of methods that can be utilized for assessment of concrete exposed to high temperatures are identified. Temperature-dependent properties of mild steel and prestressing materials for use with Portland cement concretes are provided.

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