In this study, the aim was to use different types of fibers to improve the impact re-sistance of recycled aggregate concrete (RAC) that normally shows poor perfor-mance against mechanical impacts compared to normal concrete (NC). For this pur-pose, 18 groups of concrete were cast using different parameters. The study exam-ined different types of concrete mixtures where the proportion of RCA (recycled coarse aggregate) used was 30% and 50% respectively, and where steel fiber-rein-forcement was used in proportions of 1% and 2%, and polypropylene fiber-rein-forcement was used in proportions of 0.1%. While the material performance of RAC compared to NC is analyzed in existing published literature, there is no evidence on whether the use of RCA and hybrid fibers affect the impact properties of concrete. Drop weight impact testing was conducted on test specimens and the impact re-sistance of these specimens was studied at 28 days. It was observed that the increas-ing use of RCA reduced the impact resistance. The use of 30% RCA does not signifi-cantly influence the strength of concrete. According to the results, the performance of both the NC and RAC was increased with an increase in the volume fractions of steel fiber used. In addition, hybrid fiber-reinforced concretes showed the best re-sults of all the concrete groups.
Abdul-Ahad RB, Aziz QQ (1999). Flexural strength of reinforced con-crete t-beams with steel fibers. Cement and Concrete Composites, 21, 263-268.
ACI Commitee 544 (1999). ACI 544. Measurement of properties of fiber reinforced concrete. USA.
Aliabdo AA, Abd-Elmoaty AM, Hamdy M (2013). Effect of ınternal short fibers, steel reinforcement and surface layer on impact and pene-tration resistance of concrete. Alexandria Engineering Journal, 52, 407-417.
Badr A, Ashour AF, Platten AK (2005). Statistical variations in impcat resistance of polypropylene fibre reinforced concrete. International Journal of Impact Engineering, 32, 1907-1920.
Banthia N, Yan C, Sakai K (1998). Impact resistance of fiber reinforced concrete at subnormal temperatures. Cement and Concrete Compo-sites, 20, 393-404.
Butler L, West JS, Tighe SL (2013). Effect of recycled concrete coarse aggregate from multiple sources on the hardened properites of con-crete with equivalent compressive strength. Construction and Building Materials, 47, 1292-1301.
Caf M (2012). Impact strenght of steel and polyproplene fiber rein-forced concrete. MSc thesis, Atatürk University, Erzurum.
Chenkui H, Guafon Z (1995). Properties of steel fibre reinforced con-crete containing larger coarse aggregate. Cement and Concrete Com-posites, 17, 199-206.
EN 12390-3/AC (2012). Testing hardened concrete - Part 3: Compres-sive strength of test specimens,
EN 12390-5 (2010). Testing hardened concrete - Part 5: Flexural strength of test specimens.
Erdem S, Dawson AR, Thom NH (2011). Microstructure linked strength properties and impact response of conventional and recycled con-crete reinforced with steel and synthetic macro fibers. Construction and Building Materials, 25, 4025-4036.
Eren O, Celik T (1997). Effect of silica fume and steel fibers on some properties of high strength concrete. Construction and Building Ma-terials, 11, 373-382.
Evangelista L, Brito JD (2007). Mechanical behaviour of concrete made with fine recycled concrete aggregates. Cement and Concrete Com-posites, 29, 397-401.
Gupta T, Sharma RK, Chaudhary S (2015). Impact resistance of con-crete containing waste rubber fiber and silica fume. International Journal of Impact Engineering, 83, 76-87.
Hoffmann C, Schubert S, Leemann A, Motavalli M (2012). Recycled con-crete and mixed rubble as aggregates: influence of variations in composition on the concrete properties and their use as structural material. Construction and Building Materials, 35, 701-709.
Khalaf FM, Devenny AS (2004). Recycling of demolished masonary rub-ble as coarse aggregate in concrete: review. ASCE Journal of Meteri-als in Civil Engineering, 16, 331-340.
Khaloo A, Raisi EM, Hosseini P, Tahsiri H (2014). Mechanical perfor-mance of self compacting concrete reinforced with steel fibers. Con-struction and Building Materials, 51, 179-186.
Lima C, Caggiano A, Faella C, Martinelli E, Pepe M, Realfonzo R (2013). Physical properties and mechanical behaviour of concrete made with recycled aggregates and fly ash. Construction and Building Ma-terials, 47, 547-559.
Marar K, Eren O, Celik T (2001). Relationship between impact energy and compression toughness energy of high-strength fiber-rein-forced concrete. Materials Letters, 47, 297-304.
Matias D, Brito JD, Rosa A, Pedro D (2013). Mechanical properties of concrete produced with recycled coarse aggregates - influence of the use of superplasticizers. Construction and Building Materials, 44, 101-109.
Medina C, Rojas MISD, Frias M (2013). Freeze-thaw durability proper-ties of concrete using contaminated ceramic aggregate. Journal of Cleaner Production, 40, 151-160.
Mindess S, Banthia N, Bentur A (1986). The response of reinforced con-crete beams with a fibre concrete matrix to impact loading. The In-ternational Journal of Cement Composites and Lightweight Concrete, 8, 165-170.
Mindess S, Vondran G (1988). Properties of concrete reinforced with fibrillated polypropylene fibres under impact loading. Cement and Concrete Research, 18, 109-115.
Mindess S, Yan C (1993). Perforation of plain and fibre reinforced con-cretes subjected to low velocity impact loading. Cement and Con-crete Research, 23, 83-92.
Mohammadi Y, Azad RC, Singh SP, Kaushik SK (2009). Impact re-sistance of steel fibrous concrete containing fibres of mixed aspect ratio. Construction and Building Materials, 23, 183-189.
Nataraja MC, Dhang N, Gupta AP (1999). Statistical variations in impact resistance of steel fiber reinforced concrete subjected to drop weight test. Cement and Concrete Research, 29, 989-995.
Nataraja MC, Nagaraj TS, Basavaraja SB (2005). Reproportioning of steel fibre reinforced concrete mixes and their impact resistance. Cement and Concrete Research, 35, 2350-2359.
Nia AA, Hedeyatian M, Nili M, Afroughsabet V (2012). An experimental and numerical study on how steel and polypropylene fibers affect the impact resistance in fiber reinforced concrete, International Journal of Impact Engineering, 46, 62-73.
Nili M, Afroughsabet V (2010a). Combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete. International Journal of Impact Engineering, 37, 879-886.
Nili M, Afroughsabet V (2010b). The effects of silica fume and polypro-pylene fibers on the impact resistance and mechanical properties of concrete. Construction and Building Materials, 24, 927-933.
Oikonomou ND (2005). Recycled concrete aggregates. Cement and Con-crete Composites, 27, 315-318.
Oltulu M, Altun MG (2018). The drop weight test method to determine impact strength of concrete and a review of research, Gümüşhane University Journal of Science and Technology, 8, 155-163.
Ozturk M (2005). Construction Waste Management. Ankara.
Pajak M, Ponikiewski T (2013). Flexural behaviour of self compacting concrete reinforced with different types of steel fibers. Construction and Building Materials, 47, 397-408.
Ramakrishna G, Sundararajan T (2005). Impact strenght of a few natu-ral fibre reinforced cement mortar slabs: a comparative study. Ce-ment and Concrete Composites, 27, 547-553.
Rao A, Jha KN, Misra S (2007). Use of aggregates from recycled conctruction and demolition waste in concrete. Resources Conser-vation and Recycling, 50, 71-81.
Soe KT, Zhang YX, Zhang LC, (2013). Impact resistance of hybrid-fiber engineered cementitious composite panels. Composite Structures, 104, 320-330.
Song PS, Hwang S (2004). Mechanical properties of high strength steel fiber reinforced concrete. Construction and Building Materials, 18, 669-673.
Song PS, Hwang S, Sheu BC (2005). Strength properties of nylon and polypropylene fiber reinforced concretes. Cement and Concrete Re-search, 35, 1546-1550.
Su H, Xu J (2013). Dynamic compressive behavior of ceramic fiber re-inforced concrete under impact load. Construction and Building Ma-terials, 45, 306-313.
Swamy RN, Jojagha AH (1982). Impact resistance of steel fibre rein-forced lightweight concrete. The International Journal of Cement Composites and Lightweight Concrete, 4, 209- 220.
Tam VWY, Wang K, Tam CM (2008). Assessing relationships among properties of demolished concrete, recycled aggregate and recycled aggregate concrete using regression analysis. Journal of Hazardous Meterials, 152, 703-714.
Topcu IB, Guncan NF (1995). Using waste concrete as aggregate. Ce-ment and Concrete Research, 25, 1385-1390.
Topcu IB, Sengel S (2004). Properties of concretes produced with waste concrete aggregate. Cement and Concrete Research, 34, 1307-1312.
Toutanji H, McNeil S, Bayasi Z (1998). Chloride permeability and im-pact resistance of polypropylene fiber reinforced silica fume con-crete. Cement and Concrete Research, 28, 961-968.
Wagih AM, El-Karmoty HZ, Ebid M, Okba SH (2013). Recycled construc-tion and demolition concrete waste as aggregate for structural con-crete. Housing and Building National Research Center Journal, 9, 193-200.
Wan F, Jiang Z, Tan Q, Cao Y (2016). Response of steel tube confined concrete targets to projectile impact. International Journal of Im-pact Engineering, 94, 50-59.
Wang N, Mindess S, Ko K (1996). Fibre reinforced concrete beams un-der impact loading. Cement and Concrete Research, 26, 363-376.
Xu B, Toutanji HA, Gilbert J (2010). Impact resistance of polyvinyl alco-hol fiber reinforced high performance organic aggregate cementi-tious material. Cement and Concrete Research, 40, 347-351.
Yazıcı S, Sezer GI (2008). The effect of aggregate maximum size on im-pact resistance of fiber reinforced concrete. Pamukkale University Journal of Engineering Sciences, 14, 237-245.
Zeynal E (2008). Effect of water/cement ratio and fiber content on me-chanical properties and impact resistance of steel fiber reinforced concrete mixtures. MSc thesis, Ege University, Izmir.