Open AccessCrack formation and measurement in concrete with carbon fiber-reinforced composites under bending test
Author(s) -
Yuriy Vashpanov,
Jong Gun Park,
Tatyana Podousova,
Gwanghee Heo,
Jong Yeog Son
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1162/1/012019
Subject(s) - materials science , composite material , cracking , bending , bending moment , microfiber , fiber , volume (thermodynamics) , structural engineering , physics , quantum mechanics , engineering
The certified test equipment of the MTDI Inc. Materials Testing System under bending test was using for cracking in concrete with carbon fiber-reinforced composites. The concrete samples included microfibers 6 and 12 mm long with a total volume fraction of fibers from 0.5 to 2.0%. To record the results of the experiment, a high-speed video camera was used, since with an increase in the value of the load, cracking and then destruction of the sample can occur at any moment, which is unpredictable when using different samples. This significantly increases the accuracy of determining the moment of crack formation and describing the geometric dimensions of cracks depending on the load. Optical non-contact methods of the measurements and image processing is used for determining the geometric dimensions of cracks in specimen. For concrete containing carbon fibers 6 mm long, with an increase in load and volume fractions ν cracking occurs at loads that are 1.67 times lower than in specimens with 12 mm filaments. Concretes with 12 mm long carbon fibers had a higher time for crack formations (the load increased linearly with time on Bending jig of the Materials Testing System), which slightly increases by 1.13 times with increasing parameter ν from 0.5 to 2.0%. Cracks in concrete in both cases are observed at practically the same load magnitudes at values of ν =2%.