Microstructural Changes in High and Ultra High Strength Concrete Exposed to High Temperature Environments

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Title: Microstructural Changes in High and Ultra High Strength Concrete Exposed to High Temperature Environments

Author(s): C. Alonso, C. Andrade, E. Menendez, and E. Gayo

Publication: Special Publication

Volume: 229

Issue:

Appears on pages(s): 289-302

Keywords: fire resistance; high- and ultra-high-strength concrete; microstructure

Date: 9/1/2005

Abstract:
A concrete exposed to environments of high temperature or directly to fire undergoes microstructural changes that result in loss of mechanical properties. The present paper deals with the study of high-performance concretes (HPC) and ultra high-performance concretes (UHPC) resistance to high temperatures. Microstructural changes are followed up to temperatures of 700°C. Changes on residual permeability and porosity, together with weight losses, due to moisture, binding water, aggregates and fibre transformations, are considered. The study, performed on a wide variety of concretes, indicates that UHPC seem to be less resistant at high temperatures than HPC, but the addition of fibres improves the fire resistance of UHPC.