Investigational Assessment of Modified Performance of Used Tire Concrete Mixtures

The need to provide commercial ideas to get rid of the rubber of car tires has become an urgent issue, especially adding to the various construction processes. Adding used tires (UT) to the concrete helps reduce landfill areas and declines the depletion of raw aggregate used in made the concrete mixtures. This research focuses on the study of the effectiveness of the use of UT in concrete mixtures according to the specifications of Jordan Construction, Where a fine aggregatesretained on a sieve No. 16 have been replaced with UT. Considering keeping the same volume. It has been adapted replacement ratios of 50 and 100% of the fine aggregate. Hardened properties was studied to measure the value of compressive strength (VCS) after 7, 14 and 28 curing days. In addition to determine fresh property (Slump test) to study the efficiency of adding UT on workability. A 18 cubes of (10 x 10 x 10 cm) for compressive strength test and a 9 molds (50 x 10 x10 cm) for flexural strength test, in addition to a 9 cylinders (15 cm Dia. X 30 cm height) for tensile strength test, all samples were made at a different percentages of UT (0%, 50% and 100%), at water/cement ratio of 0.60. This study concluded that there is no inverse relationship with the increase in the percentage of UT, where the compressive strength at the 100 replacement ratio of UT was greater than 50%, the increase rate was around 19% at 100% of UT related to 50%. The results indicated that the workability value was not considerably affected, where the slump value was nearly equal to the various replacement ratios 0, 50, and 100%. 90, 100, and 100 mm respectively. Furthermore, a unit weight of used tires concrete mixes (UTCM) was reduced about 20% for 100% replacement and 10% for 50% replacement of UT related to normal concrete mixtures (0% UT).