Physical and mechanical properties of ultra high strength fiber reinforced cementitious composites

This paper presents the experimental research regarding the physical-mechanical properties and the durability characteristics of the ultra high performance concrete. The cementitious composite with 2 % volume of steel fibers was tested for the following characteristics: the compressive and tensile strength, the moduli of elasticity, the stress-strain characteristic curve for compression strength and flexural strength and tests after aproximately 1000 cycles of freezing and thawing. The specimens subject to 90C thermal treatment for 5 days displayed an increase of compressive strength up to 180 MPa at the age of 6 days. The experimental data obtained on specimens with thermal curing regime are evaluated by comparison with specimens with water curing regime.