TY - JOUR ID - 41392 TI - Hybrid Fiber Reinforced Concrete Containing Pumice and Metakaolin JO - Civil Engineering Infrastructures Journal JA - CEIJ LA - en SN - 2322-2093 AU - Rashid Dadash, Pantea AU - Ramezanianpour, Ali Akbar AD - M.Sc. Student, Department of civil engineering, Amirkabir University of Technology, Tehran, Iran. AD - Professor, Department of civil engineering, Amirkabir University of Technology, Tehran, Iran. Y1 - 2014 PY - 2014 VL - 47 IS - 2 SP - 229 EP - 238 KW - compressive strength KW - Fiber Reinforced Concrete KW - Flexural Toughness KW - Pumice and Metakaolin KW - Steel and Polypropylene Fibers DO - 10.7508/ceij.2014.02.006 N2 - Fiber reinforced concrete (FRC) has been widely used due to its advantages over plain concrete such as high energy absorption, post cracking behaviour, flexural and impact strength and arresting shrinkage cracks. But there is a weak zone between fibers and paste in fiber reinforced concretes and this weak zone is full of porosity, especially in hybrid fiber reinforced concretes. So it is necessary to apply a material that reduces porosity and consolidates this transition zone. In this research first, the flexural and impact resistance tests were carried out on hybrid fiber reinforced concretes to choose the optimum percentage of steel and polypropylene fibers based on flexural toughness, modulus of rupture and impact resistance. Finally, compressive strength tests were conducted on selected hybrid fiber reinforced concretes containing pumice and metakaolin to choose the better pozzolan and replacement level based on compressive strength test. Results showed that, metakaolin with 15% substitution for cement had a significant role in increasing compressive strength. However, pumice did not act on the same basis. UR - https://ceij.ut.ac.ir/article_41392.html L1 - https://ceij.ut.ac.ir/article_41392_6dbd155dc5f2b6b9d1838a93ed02f7a5.pdf ER -