Effect of Temperature and Triaxial Compression on Engineering Behavior of High-Performance Concrete


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Title: Effect of Temperature and Triaxial Compression on Engineering Behavior of High-Performance Concrete

Author(s): Xiaojun Li, Gerard Ballivy and Kamal H. Khayat

Publication: Special Publication

Volume: 172


Appears on pages(s): 853-870

Keywords: Compressive strength; high-performance concretes; temperature; triaxial stresses

Date: 12/1/1999

High performance concrete can be used as a vault sealing material in nuclear fuel waste chambers deep in the rock mass and can then be subjected to a triaxial-stress state and a maximum temperature in excess of 200 OC. Triaxial compression measurements at high temperature and pressure have been carried out on high performance concrete specimens. The experiments consisted of measuring in cylindrical specimens subjected to several conditions involving four triaxial loading conditions (03 = 0, 10, 20, and 40 MPa), two testing temperatures (T = 20 and 200 “C), two curing periods (28 and 90 days), a saturated moisture condition, two types of concrete mixtures (type H and type K). Testing was carried out to determine the way in which the physical stability, strength, and deformability of HPC subjected to ambient and high temperature conditions. The testing program shows that the triaxial strength increases with the increasing of the confining pressure and cure period at a constant temperature. The effect of confining pressure and cure period become less critical at high temperature and confining pressure. With increasing temperature at a constant confining pressure, the triaxial strength decreases especially at higher confining pressure ( a3 = 40 MPa). When the temperature and confining pressure were raised, the angles of internal friction !D and the Hoek Brown material constant m decrease, but the cohesive strength increase. High performance concrete at room and high temperature conditions shows elastic-brittle and quasi-elastic-brittle properties, respectively.