STUDY ON THE SIZE EFFECT OF UHDCC MECHANICAL PROPERTIES
This article studied the influence of size effect and end constraint on the mechanical properties of ultra-high ductile cementitious composites, in short UHDCC.The fiber material used in this paper is UHMWPE fiber.UHDCC dogbone specimens with five different thicknesses ranging from 10mm to 40mm were adopted for uniuniaxial tensile tests.Compressive tests were conducted on UHDCC cubes which having 3 different sizes and 3 different end constraints, as well as UHDCC cylinders with 3 different sizes and uniform aspect ratio.The tensile test results indicated that the tensile strain capacity of UHDCC reached 7.11%, and no significant size effect of the tensile strength and tensile strain capacity of UHDCC was found.The compressive test results indicated that UHDCC exhibits excellent deformability under increasing compression.As the level of end constraint gradually was reduced, the compressive strength of UHDCC cubes decreases and the compressive strain-hardening behavior gradually disappeared.When the end constraint was eliminated, compressive strength of UHDCC cubes with different sizes is close to that of the UHDCC cylinders.The experimental study demonstrated that end constraint has significant influence on the compressive property of UHDCC while the size effect is minimal for the cementitious material with ultra-high ductility.
Size effect End constraint Compressive strength Strain-hardening
Wei Wu Yichao Wang Jiangtao Yu
College of Civil Engineering, Tongji University, Shanghai, China
国际会议
福州
英文
566-575
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）