Vol. 21 No. 1 (2018) Cover Image
Vol. 21 No. 1 (2018)

Published: February 28, 2018

Pages: 161-165

Articles

Improving Strengths of Porcelanite Aggregate Concrete by Adding Chopped Carbon Fibers

Sheelan M. Hama 1 Shaho Mahmoud Hama 1 Mohammed H. Mhana 1
1 College of Engineering, University of Anbar, IRAQ
History
  • Received: February 15, 2016
  • Revised: April 10, 2016
  • Accepted: December 4, 2016
  • Available Online: February 10, 2018
DOI

https://doi.org/10.29194/NJES21010161

Abstract

In this work chopped carbon fibers are used to improve tensile strength of Porcelanite lightweight aggregate concrete. Silica fume was added in order to improve the mixes compressive strength. Silica fume increase water demand and using fibers reduce workability, to improve workability and decrease water demand high rang super plasticizers are used. The results showed that compressive strength, splitting tensile strength, modulus of elasticity of carbon fibers Porcelanite lightweight aggregate concrete increase with increasing of carbon fiber up to 2% compared to reference Porcelanite lightweight aggregate concrete without fibers. The percentages of increasing were 14.40%, 68.00%, and 10.66% for compressive strength, splitting tensile strength, and modulus of elasticity, respectively.  Flexural Strength continues in increase with increase of fibers. The dry unite weight of mixes with chopped fiber decrease with increase of fiber percentage. Besides the chopped carbon improved the ductility of Porcelanite lightweight aggregate concrete and that clear from stress-strain relationship.

References

  1. ACI Committee 213, "Guide for Structural Lightweight–Aggregate Concrete", in ACI Manual of Concrete Practice. American Concrete Institute: Farmington Hills, MI., 2003, 38 p.
  2. K.S. Bassam, , D. Hagopian, and N. Al–Sadi " Geological Investigation of Traifawi Montmorillon Clay – Stone Deposit, West Desert", Geosuv. Internal report, Sep. 1986.
  3. M. Kdair and A. Aboud, " Mineral Investigation for Porcelanite Deposit in Traifawi region -West Desert", Geosuv. Internal report, Sep. 1993.
  4. A. AL-Rawi, Kusi Shouki," Properties of Lightweight concrete Produced from Local Porcelanite Aggregate", M.Sc. Thesis ,Baghdad University, 1995.
  5. B.A.A. Al-Dhaher,, “ The Use of Local Porcelanite for the Production of Light Weight Concrete Units ”, M.Sc. Thesis, University of Technology, April 2001, 113 p.
  6. A.S. AL-Duleimy," Efect of Addition of Superplasticizer and SPR in some Properties of Porcelinite Lightweight Aggregate Concrete" ,M.Sc. Thesis ,Civil Eng. Dept. ,University of Al-Anbar, April 2005.
  7. "Carbon Fiber,"Core Composites ,.Sales@Core Composites 2015, http://www.corecomposites.com/
  8. Z. A. Raouf, “ Dynamic Mechanical Properties of Fiber-Reinforced Cement Composites ”, Ph. D. Thesis, University of Manchester, May, 1975.
  9. P.W. Chen, and D.D.L. Cung, “ Cement Reinforced with Up to 0.2 vol. % of Short Carbon Fibers ”, Composites, Vol. 24, No. 1, 1995, pp. 33-52.
  10. I. K. Wasan, and A. Akar, " Mechanical Properties of High Performance Carbon Fiber Concrete ",Eng. & Tech. Journal , Vol. 29, NO.5 ,2011,pp. 906-924.
  11. Iraqi Specification No. 5, "Portland Cement", the Cement Agency for Standardization and Quality Control, Baghdad 1984, 8 p.
  12. Iraqi Specification No. 45, "The Aggregates of The Natural Resources Used in Concrete Construction", the Central Agency for Standardization and Quality Control, Baghdad 1984.
  13. ASTM: C330–05, "Standard Specification for Lightweight Aggregates for Structural
  14. Concrete", Annual Book of ASTM: Standards, Vol. 04–02, 2005, pp. 187–189.
  15. ASTM: C1240–05, "Silica Fume Used in Concretitious Mixtures ", American Society of Testing and Material International, 2005.
  16. ASTM: C311–05 , "Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland–Cement Concrete", American Society of Testing and Material International, 2005.
  17. ASTM: C494–05, "Chemical Admixtures for Concrete", American Society of Testing and Material International, 2005.
  18. "CEB-FIP Manual of Light Weight Aggregate Concrete", 2nd Edition, Surrey University Press, Glasgow and London, 1983, p259.
  19. ASTM: C39–01, "Compressive Strength of Cylindrical Concrete Specimens", American Society of Testing and Material International, 2005.
  20. ASTM: C496–05, "Splitting Tensile Strength of Cylindrical Concrete Specimens", American Society of Testing and Material International, 2005.
  21. ASTM: C293–05, "Flexural Strength of Concrete [Using Simple Beam With Center–Point Loading", American Society of Testing and Material International, 2005.
  22. ASTM: C469–02, "Standard Test Method for Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression", American Society of Testing and Material International, 2002.
  23. ASTM: C567–00, "Standard Test Method for Unit Weight of Structural Lightweight Concrete", American Society of Testing and Material International, 2000.
  24. J. Thomas and A. Ramaswamy, “Mechanical properties of Steel fiber-Reinforced Concrete”, Journal of Materials in Civil Engineering (ASCE), Vol. 19, No.5, May 1, 2007, pp. 385-392.