Application of elastomers in concrete industry has been successful in the last few years
perhaps due to some properties of these substances, which make it possible for the
elastomers such as rubber aggregates to save the tougher cementitious compounds.
This paper investigates the mechanical properties and fracture toughness of rubberized
modified concrete under static loading. The natural aggregate was replaced partially
with different rubber contents of (5-10-15-20-25-30-40 %) replacement of fine rubber
aggregate with size of (1-4)mm, and contents of (5-15-25 %) as a replacement of coarse
rubber aggregates with size of (4-20)mm. Laboratory tests include compression and
indirect tension were conducted, static flexural test was carried out using square slab
specimens. The results from laboratory testing on all concrete specimens were
analyzed. It was found that the inclusion of rubber aggregates into concrete will reduce
the strength of concrete. The usage of fine aggregate sizes of rubber up to specified
dosage, gives better strength of concrete compared that of greater sizes of rubber
aggregates.The rubberized modified concrete can absorb fracture energy and has more
suitable usage in roads, bridges, airports runways and some of the military defensive
constructions such as shelters and fortifications