نوع مقاله : پژوهشی
نویسندگان
1 دانشکده ی مهندسی عمران، دانشگاه حکیم سبزواری
2 دانشکده ی مهندسی راه آهن - دانشگاه علم و صنعت ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The improvement of compressive and tensile strength of concrete has a great
importance in the construction industry. In this study, cubic samples constructed in a dimension of $150\times150\times150$ mm containing different amounts of macro-synthetic (0.1 and 0.15 vol.\%) and polymeric fibers (0.2, 0.3, and 0.35
vol.\%) by means of seven mix designs. Compressive and splitting tests were
performed using a universal testing machine. For each specimen, stress-strain
and load-displacement behaviors, absorbing energy, ductility and crack patterns
were investigated. In order to analyze the strain variations on the surface of
the specimens digital image correlation (DIC) was applied. Moreover, finite
element method (FEM) was conducted to evaluate the experimental results. The
results of this study show that the presence of fibers in concrete has a
significant effect on reducing size and number of cracks, and increases
displacement compared to conventional concrete. In addition, displacement at
the failure moment in tension and pressure for fiber contained concrete was
more than the control specimen. According to the observations, addition of the
fibers reduces compressive and tensile strength. However, it is so obvious from
the results that by choosing the optimal amount, this reduction would be
neglected in comparison with the positive effects of the fibers. Finally, the
results indicate an acceptable agreement between the FEM and DIC evaluations.
Therefore, considering the low cost and high speed of analysis with FEM and DIC
methods, it is possible to combine these two methods as a useful tool to determine the surface characteristics of such specimens.
کلیدواژهها [English]
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