Optimum Steel Fiber Content of High Strength Pozzolime Concrete
Engineering and Technology Journal,
2021, Volume 39, Issue 12, Pages 1869-1874
AbstractPozzolime is a promising alternative binder, compared to Portland cement because of its low CO2 emission. it is produced by mixing hydrated lime, silica fume, and fly ash. Fiber is added to concrete to improve the durability, mechanical properties of the structure, and others. In this study, high-strength Pozzolime concrete was reinforced with hooked-end steel fiber which was added as fractions of volume of 0.5, 1, 1.5, and 2%. Optimization for fiber content was performed according to the workability and strength of the fiber-reinforced mixture. Obtained results showed that the compressive strengths at 14d and 90d increased by 71.4% and 58.3% respectively when adding 1.5% steel fiber. Correspondingly, the 14d, 28d, and 90d flexural strength of pozzolime concrete increased by 170.4%, 203.2%, and 191.4% respectively at 1.5% and a further increase in fiber content caused a reduction in strength. The finding presented in this research confirmed that the volume fraction (1.5%) can be considered as the optimum content.
- In UHPC, autogenous shrinkage dominates over the drying shrinkage.
- High pouring temperature and coarse sand increase the number and size of pores.
- Increasing silica fume over 25% of cement content reduces compressive strength.
- Adding steel or basalt fibers minimize the inverse effect of autogenous shrinkage.
 F. Pacheco-Torgal, J. Castro-Gomes, and S. Jalali, Alkali-activated binders: A review. Part 1. Historical background, terminology, reaction mechanisms and hydration products, Constr. Build. Mater. 22 (2008) 1305–1314, doi: 10.1016/J.CONBUILDMAT.2007.10.015.
 A. J. Alsaad, T. S. Al-Attar, and B. S. Al-Shathr, Utilization of Mineral Sequestration for CO2 Capturing in Car Parks and Tunnels, Eng. Technol. J., 38 (2020), doi: 10.30684/etj.v38i5a.594.
 D. Saleh Al-Attar, B. Salah Mehdi, and M. Frayyeh Hattab, EFFECT OF EXTERNAL SULPHATES ON PROPERTIES OF LIME-POZOLANA CONCRETE, J. Eng. Sustain. Dev., 23 (2019), doi: 10.31272/jeasd.23.5.4.
 A. Moropoulou, A. Cakmak, K. C. Labropoulos, R. Van Grieken, and K. Torfs, Accelerated microstructural evolution of a calcium-silicate-hydrate (C-S-H) phase in pozzolanic pastes using fine siliceous sources: Comparison with historic pozzolanic mortars, Cem. Concr. Res., 34 (2004) 1–6, doi: 10.1016/S0008-8846(03)00187-X.
 N. Kadum, T. Al-Attar, and Z. Al-Azzawi, Evaluation of pozzolime mixtures as a sustainable binder to replace portland cement in structural concrete, in MATEC Web of Conferences, 120 (2017) , doi: 10.1051/matecconf/201712002009.
 N. Saikia and J. de Brito, Use of industrial waste and municipality solid waste as aggregate, filler or fiber in cement mortar and concrete, in Municipal Solid Waste, (2012).
 [A. Meda, F. Minelli, G. A. Plizzari, and P. Riva, Shear behaviour of steel fibre reinforced concrete beams, Mater. Struct. Constr., 38 (2005) 277, doi: 10.1617/14112.
 M. A. Mansur, K. C. G. Ong, and P. Paramasivam, Shear Strength of Fibrous Concrete Beams Without Stirrups, J. Struct. Eng., 112 (1986) 2066–2079, doi: 10.1061/ (ASCE) 0733-9445(1986)112:9(2066).
 J. Susetyo, P. Gauvreau, and F. J. Vecchio, Effectiveness of steel fiber as minimum shear reinforcement, ACI Struct. J., 109 (2012) 426–428.
 L. Daniel and A. Loukili, Behavior of High Strength Fiber-Reinforced Concrete beams under cyclic loading, Struct. J., 99 (2002) 248–256, doi: 10.14359/11908.
 R. D. Lequesne, M. Setkit, G. J. Parra-Montesinos, and J. K. Wight, Seismic Detailing and Behavior of Coupling Beams With High-Performance Fiber Reinforced Concrete, (2010).
 S. P. Shah and B. V. Rangan, Fiber Reinforced Concrete Properties, J. Proc., 68 (1971) 126–137, doi: 10.14359/11299.
 Z. Wu, C. Shi, and K. H. Khayat, Investigation of mechanical properties and shrinkage of ultra-high performance concrete: Influence of steel fiber content and shape, Compos. Part B Eng., 174 (2019) 107021, doi: 10.1016/J.COMPOSITESB.2019.107021.
 G. K. Mohammed, K. F. Sarsam, and I. N. Gorgis, Flexural Performance of Reinforced Concrete Built-up Beams with SIFCON, Eng. Technol. J., 38 (2020) 669–680, doi: 10.30684/ETJ.V38I5A.501.
 Fiber-Reinforced Cements and Concretes - Colin D Johnston - Google Books.” https://books.google.iq/books/about/Fiber_Reinforced_Cements_and_Concretes.html?id=A1lZ9CjfSWYC&redir_esc=y
 M. Grzybowski and S. P. Shah, Shrinkage Cracking of Fiber Reinforced Concrete, Mater. J., 87 (1990) 138–148, doi: 10.14359/1951.
 J. R. Deluce and F. J. Vecchio, Cracking Behavior of Steel Fiber-Reinforced Concrete Members Containing Conventional Reinforcement, ACI Struct. J., 110.
 ACI Comite 544, State of the Art Report on Fiber Reinforced Concrete Reported (ACI 544.1R-96 Reapproved 2002), ACI Struct. J., 96 (2002) Reapproved.
 J. Thomas and A. Ramaswamy, Mechanical Properties of Steel Fiber-Reinforced Concrete, J. Mater. Civ. Eng., 19 (2007) 385–392, doi: 10.1061/(ASCE)0899-1561(2007)19:5(385).
 ASTM C 1240/C 1240M - 05, Standard Specification for Silica Fume Used in Cementitious Mixtures, ASTM Int., (2005).
 ASTM 618, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, Annu. B. ASTM Stand., (2005).
 ASTM, Standard Specification for Lime for Use with Pozzolans, ASTM C821 - 14, 78 (2014) Reapproved.
 ASTM C494, Standard Specification for Chemical Admixtures for Concrete, ASTM Int., no. February, (2015) 1–10, doi: 10.1520/C0494.
 S. Fibers and F. Concrete, A 820/A 820M-04 Standard Specification for steel fibers for fiber-reinforced concrete, ASTM, (2004).
 ASTM C143/C143M, Standard Test Method for Slump of Hydraulic-Cement Concrete, Astm C143, no. 1, (2015).
 BS EN 12390-2019 Part 3, testing hardened concrete: Compressive strength of test specimens, Br. Stand. Inst., (2019).
 ASTM International, Astm C78/C78M - 02: Stand. Test Method Flexural Strength Concr. (Using Simple Beam with Third-Point Loading)ASTM Int. USA, 04.02 (2002).
 T. S. Al-Attar, S. F. Daoud, and A. S. Dhaher, Workability of Hybrid Fiber Reinforced Self-Compacting Concrete, Eng. Technol. J., 36 (2018), Accessed: Jul. 30, 2021. [Online]. Available: https://mail.engtechjournal.org/index.php/et/article/view/131.
- Article View: 123
- PDF Download: 120