Stress-Strain Properties of SIFCON in Uniaxial Compression and Tension

摘要

This report presents a comprehensive investigation of the properties of SIFCON composites in both uniaxial compression and uniaxial tension, as well as their stress-displacement response in tension. The importance of the primary reinforcing parameters such as fiber type, fiber orientation, matrix properties, and matrix penetration of the fiber network is highlighted. Test results indicate that very high compressive strengths (up to 20 k/sq. in. or 140 MPa) can be achieved an compressive strains of up to 10% can be expected at about half the strength. Similarly, high tensile strengths (up to 4 k/sq. in. or 28 MPa) with strains of up to 2% accompanied by extensive multiple cracking were also observed. Surface energies and toughness indexes in tension reached about three orders of magnitude above those known for plain concrete. The toughness of SIFCOM in compression computed at 10% strain was up to 50 times that of plain concrete. Analytical models are proposed to predict the stress-strain response of SIFCON in both compression and tension as well as its stress-crack opening response in tension. SIFCON, FIber concrete, Cement composites, Constitutive modeling, Mathematical modeling, Uniaxial compression, Uniaxial tension. (mjm)