PSI - Issue 18

Sana Gul et al. / Procedia Structural Integrity 18 (2019) 101–107 Sana Gul/ Structural Integrity Procedia 00 (2019) 000–000

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almost triple for 1% and 5% replacement of RRSF as compared to SF. This reduction in split tensile again might be due to the week bonding between cement, aggregate, and RRSF. Which lead to reduction in strength 11 . The reduction in strength increases with increasing percentage of rubberized fiber.

1% SF and RRSF 5% SF and RRSF

10 15 20 25 30

0 5

SF

RRSF

Split Tensile Strength (MPa)

Fig.4. Split Tensile Strength Test Results

6. Conclusions From the results it can be concluded that increasing the percentage replacement of RRSF the compressive and split tensile strength of concrete reduces as compared to specimens containing steel fiber. The main reason for this trend might be the weaker bond between the concrete mix and recycled rubber steel fiber. However, notable ductility was observed before failure of the sample after testing. In destructive tests, the specimens containing RRSF stayed intact indicating that recycled rubber steel fibers may be absorbing forces that are acting upon it. The failure was somehow ductile rather than brittle for the samples containing recycled rubber steel fiber Such behavior can prove beneficial for structures that require good impact resistance properties. Furthermore, the strain at failure also increased. Higher tensile strain at the point of failure shows higher energy absorbent capability of the mixture. 7. Recommendations The long-term performance of these mixes is not known in field. So, the use of such mixes is recommended in places where high compressive and tensile strength of concrete is not important e.g. sidewalks, pavement sections etc. References [1] Thomas, Blessen Skariah, and Ramesh Chandra Gupta. "A comprehensive review on the applications of waste tire rubber in cement concrete." Renewable and Sustainable Energy Reviews 54 (2016): 1323-1333. [2] Abdollahzadeh, A., R. Masoudnia, and S. Aghababaei. "Predict strength of rubberized concrete using atrificial neural network." WSEAS Transactions on Computers 10.2 (2011): 31-40. [3] Sienkiewicz, Maciej, et al. "Progress in used tyres management in the European Union: a review." Waste management 32.10 (2012): 1742 1751. [4] Abdollahzadeh, A., R. Masoudnia, and S. Aghababaei. "Predict strength of rubberized concrete using atrificial neural network." WSEAS Transactions on Computers 10.2 (2011): 31-40. [5] Güneyisi, Erhan, Mehmet Gesoğlu, and Turan Özturan. "Properties of rubberized concretes containing silica fume." Cement and concrete research 34.12 (2004): 2309-2317.