Study on the effects of specimen size on fracture performance of ultra high performance concrete
PEI Beibei
SUN Mingqing
WANG Yingjun
Abstract：The effects of specimen size on fracture properties of ultra high performance concrect(UHPC)were studied by three-point bending test with three kinds of prefabricated notch specimens in different size. The crack mouth opening displace-ment(CMOD)was observed and the relationship between load and CMOD was analyzad by digital image correlation method(DIC). The results showed that UHPC exhibited good strain hardening when the fiber volume was 2% in the tensile test. The limit of proportionality(LOP)and the modulus of fracture(MOR)decreased with the increase of the specimens size,but the LOP decreased more slowly while the fracture modulus was quite sensitive to the size of the specimen,showing a sharp downward trend. This was because that in same component UHPC,the LOP was influenced a lot by initial cracking properties of matrix while the MOR de-pends mainly on the distribution of the fibers which caused by the different size of specimens.
Keywords：ultra high performance concrectspecimen sizefracture properties
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 56-59 )