STUDY ON MECHANICAL PROPERTIES OF C80 CONCRETE AT DIFFERENT AGES

It was studied the mechanical behaviors of C80 high-strength commercial concrete at different ages，based on the test of C80 high-strength commercial concrete specimens． It was also studied a variety of performance indicators such as the cube compressive strength，axial compressive strength，splitting tensile strength，static elastic modulus and the whole process of uniaxial stress-strain of concrete and so on at the age of 12 h，1 ，3，7， 14， 28 and 90 d． It was analyzed the variation of performance index with age growth and explored the variation of early strength 7 d ago) and ultra-early strength 3 d ago of C80 high-strength concrete． At last，the paper obtained formulas of cube compressive strength and elastic modulus of C80 high-strength concrete at any age．