الفهرس 
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Abstract
Many end-of-life tires are generated globally each year, so increasing
quantities of scrap tires creates a potential source of fire and health hazards. All plain
concrete pavements should be constructed with closely spaced joints. But with
rubberized concrete, it was possible to build a longer space joint than plain concrete
without the risk of shrinkage. With a percentage of 10% of recycled rubber as a partial
replacement of fine aggregate by volume as the best percentage is used in all
rubberized concrete mixtures. This study investigates the effect of the addition of
single and hybrid fibers on the mechanical, physical and some durability properties of
rubberized concrete. Moreover, hooked-end steel fibers Dramix 3D 80/60BG is used at
contents of 10, 20, and 30 kg/m3. Also, JUSHI E-glass fibers is used at contents of 0.5,
1, and 1.5 kg/m3. Moreover, combinations of steel and glass fibers are considered in
order to study the effect of fibers hybridization on the rubberized concrete properties.
However, experimental tests are conducted as slump, compression, fracture, splitting,
flexural, impact, ultrasonic pulse velocity, Schmidt rebound hammer, electric
resistivity, water absorption, and abrasion resistance in laboratory temperature and
after heating/cooling cycles. Experimental results show some improvements in
physical, mechanical, and durability properties of rubberized concrete according to the
type and percentage of fibers added. The rubberized concrete with steel fibers has
better characteristics than that with glass fibers, and those with hybrid fibers are the
best. Moreover, there has been a significant improvement in most performances of
rubberized concrete mixes (with / without fibers), after heating/cooling cycles. Finally,
some recommendations for improvement further work based on test results are
presented.