Effect of Cross Sectional Shape of Polypropylene Fibers on Flexural Toughness of Composites and Fiber-to-Cement Matrix Adhesion

Abstract:

Cement based material are weak in flexure in comparison to compression. Fibers have been used for 100 years ago in an industrial process (i.e. Hatschek machine) to improve flexural and tensile strength of cement based materials. Many researches have been performed to define the best fiber condition such as fiber type, length, and diameter. A few investigations have been done on the effects of fiber cross section on fiber-cement bonding and flexural strength. In this research, polypropylene (PP) fibers which have diversity in cross section were selected and used as reinforcement in cementitious composites. Fibers characterized for cross sectional shape and average surface area. Flexural strength of the specimens at different fiber volume contents was evaluated. Also, the adhesion of the fibers (with different cross sections such as hollow, delta and circular) was measured using the pull-out test. Results showed that the cross section has an important effect on bonding of the fibers to cement matrix and flexural toughness of the specimens. It was observed that the hollow fiber that has the biggest lateral surface showed the highest pull-out load, and the delta fiber showed best flexural behavior.

• Periodical: Advanced Materials Research (Volume 687)
• Pages: 485-489
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.687.485
• Online since: April 2013
• Authors: Zahra Behdouj, Masoud Jamshidi, Masoud Latifi, Mana Halvaei
• Keywords: Cement-Based Composite, Cross Section Shape, Equivalent Diameter, Flexural Strength, Polypropylene Fiber, Pull-Out Energy

References

[1] A.E. Naaman, High Performance Fiber Reinforced Cement Composite, Concrete Structures for the future, IABSE Symposium, Paris, France, (1987) 371-376.

[2] A.E. Naaman and H.W. Reinhardt, Characterization of High Performance Fiber Reinforced Cement Composites, Proceedings of 2nd International Workshop on HPFRCC, Chapter 41, in High Performance Fiber Reinforced Cement Composites: HPFRCC 2, A.E. Naaman and H.W. Reinhardt, Editors, RILEM, No. 31, E. & FN Spon, London, (1996).

DOI: 10.51202/9783816793977-3

[3] Z. S. Metaxa, M. S. Konsta-Gdoutos and S. P. Shah, Crack Free Concrete Made With Nanofiber Reinforcement, (accessed at 1 October 2012), http: /iti. northwestern. edu/publications/utc/safetea-lu/FR-3-Shah.

[4] A.E. Naaman, Fiber Reinforced Concrete: State of Progress at the Edge of the New Millennium, Design and Sustainability of Structural Concrete in the Middle East with Emphasis on High- Rise Buildings, Proceedings of the ACI-KC Second International Conference, Kuwait. (2007).

[5] B. A. Hamilah, Engineering properties of polymer and natural fiber reinforced mortar, a report submitted in partiall fulfillment of the requirements for the award of the degree of Bachelor of Civil Engineering, (2009).

[6] B. Banholzer, Bond of a strand in a cementitious matrix, Materials and Structures 39, (2006) 1015-1028.

DOI: 10.1617/s11527-006-9115-y

[7] J.I. Daniel, J.J. Roller and E.D. Anderson, Fiber Reinforced Concrete, Portland Cement Association, Chapter 5, (1998) 22-26.

[8] A. E. Naaman, Engineered Steel Fibers with Optimal Properties for einforcement of Cement Composites, Journal of Advanced Concrete Technology 1(3)(2003) 241-252.

DOI: 10.3151/jact.1.241

[9] D. J. Kim, S. El-Tawil and A.E. Naaman, Effect of Matrix Strength on Pullout Behavior of HighStrength Deformed Steel Fibers, ACI special publications, sp272, (2007) 135-150.

[10] C. Sujivorakul, A.M. Waas, A.E. Naaman, Pullout Response of a Smooth Fiber with End Anchorage, Journal of Engineering Mechanics, American Society of Civil Engineers, 126(9) (2000) 986-993.

DOI: 10.1061/(asce)0733-9399(2000)126:9(986)

[11] A.E. Naaman, Fibers with Slip-Hardening Bond, in High Performance Fiber Reinforced Cement Composites-HPFRCC, edited by H.W. Reinhardt and A.E. Naaman, RILEM Publications S.A.R.L., Cachan, France, (1999) 371-385.

DOI: 10.51202/9783816793977-3

[12] C. Sujivorakul, Development of High Performance Fiber Reinforced Cement Composites using Twisted Polygonal Steel Fibers, Ph.D. Thesis, University of Michigan, Ann Arbor, (2002).

[13] D. J. Kim, , S. El-Tawil and A.E. Naaman, Correlation Between Single Fiber Pullout And Tensile Response Of FRC Composites With High Strength Steel Fibers, ACI Materials Journal 93(5)(1996) 1-7.

[14] C. Sujivorakul and A.E. Naaman, Tensile Response of HPFRC Composites using Twisted Polygonal Steel Fibers, Proceedings of Fiber Reinforced Concrete: Innovation for Value, ACI Convention, Toronto, ACI Special Publication, (2003).

DOI: 10.14359/12898

[15] Y. Wang, Mechanics of fiber reinforced cementitious composites, PhD thesis, Massachusetts Institute of Technology, (1989).

[16] R. Brown, A. Shukla and K.R. Natarajan, Fiber Reinforcement of Concrete Structures, thesis of University of Rhode Island, (2002).

[17] D.J. Hannant, Fibre cements and fibre concretes, John Wiley and Sons, New York, (1978).