Impact of addition of macro fibers on the mechanical properties of concrete

الملخص EN

Using of fibers in manufacturing concrete is one of the most important technique to overcome the brittleness behavior of concrete.

in this study, the impact of addition these fibers on the mechanical properties of concrete was examined using three different types of polyolefins, polypropylene, and glass-chopped fibers.

each fiber type was tested at five different doses (2 kg / m3, 4 kg / m3, 6 kg / m3, 8 kg / m3, and 10 kg / m3 of concrete).

the fibers were randomly added to various groups, verifying that they were well mixed.

slump and compacting factor tests for new concrete were studied.

the findings of the slump test show that the value of the slump dropped as the dose of fiber rose.

for hardened concrete, characteristic compressive strength, splitting tensile strength, and flexural tests were identified.

the compressive strength of concrete after both 7 and 28 days enhanced by about 6%, 7%, and 16% for concrete mixes with polypropylene, glass, and polyolefin fibers, respectively, this improvement was recorded for fiber dose of 6 kg / m3.

all specimens of cubes, cylinders, and concrete beams were loaded twice and had a good ability to withstand more stresses and deformations again, especially for the used fiber dose of about 4-6 kg / m3.