##plugins.themes.academic_pro.article.sidebar##

Download
pdf
Statistic
Read Counter : 62 Download : 51

##plugins.themes.academic_pro.article.main##

Abstract

Due to many reasons, concrete may not be poured in a single connected operation and therefore joints are formed in locations of old-new concreting. This study discusses the behavior of Reinforced Concrete (RC) and Fiber Reinforced Concrete (FRC) beams containing longitudinal cold joints under two compaction scenarios. The first layer in the first scenario is compacted prior pouring of the second layer, while the other scenario investigates the effects of leaving the first layer uncompacted. It is believed the compaction of the first layer has an important effect on the bonding characteristics between both concrete layers as it may affect the roughness of the joint interface. The study also investigates the time elapsed before pouring of the second layer. The cold joint was located at compression fiber at 0.7h from bottom. Under the four-point load testing, ten 100×160×1000 mm RC beams have been tested and evaluated. Three groups of beams were separated from one another. Four beams make up the first group; one uses as a control, while the other three have horizontal cold joints, the second group consists of three beams with horizontal cold joint and without compacted first layer. whereas the third group consists of three beams with horizontal cold joint adding steel fiber to strengthen the samples that have the least load. The results showed a decrease in ultimate load, ductility and energy absorption capacities for specimen B1.5-RC-NC, B3.0-RC-NC and B4.5-RC-NC, ultimate load, ductility and energy absorption capacities were decreased (9.03%,50.5%,50.9%), (23.4%,31.5%,33.3%) and (27.7%,84.0%, 85.6%) respectively in comparison with control beam. While the decrease in ultimate load, ductility, energy absorption capacities for specimen with steel fiber B1.5-FRC-NC, B3.0-FRC-NCand B4.5-FRC-NC were (5.02%,37.0%, 38.3%), (19.2%,21.1%,21.6%) and (26.5%,58.4%, 58.5)

Keywords

Cold joint steel fiber flexural strength

##plugins.themes.academic_pro.article.details##

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

How to Cite
Maysaa Aziz Mahdi, & Ali Abd Sultan. (2023). Effects of Steel Fiber and Compaction Process on the Flexural Strength of Reinforced Concrete Beams with Longitudinal Cold Joints. Texas Journal of Engineering and Technology, 25, 81–91. Retrieved from https://zienjournals.com/index.php/tjet/article/view/4575

References

  1. [1] P. K. Mehta and P. J. M. Monteiro, Concrete: microstructure, properties, and materials. McGraw-Hill Education, 2014.
  2. [2] A. M. Neville and J. J. Brooks, Concrete technology, vol. 438. Longman Scientific & Technical England, 1987.
  3. [3] İ. Bekem Kara, “Experimental Investigation of the Effect of Cold Joint on Strength and Durability of Concrete,” Arab. J. Sci. Eng., vol. 46, no. 11, pp. 10397–10408, 2021, doi: 10.1007/s13369-021-05400-5.
  4. [4] A. H. Aziz, “Flexural and Shear Behavior of Hybrid I-Beams with High-Strength Concrete and Steel Fibers.” Ph. D. Theise Al-Mustansiriya University, College of Engineering, Iraq, 2006.
  5. [5] Cement Concrete & Aggregate Australia, “DS2006-Compaction-of-Concrete,” no. june, 2006.
  6. [6] M. TUNCAN, Ö. ARIÖZ, K. RAMYAR, and B. KARASU, “EFFECT OF COMPACTION ON ASSESSED CONCRETE STRENGTH SIKIŞTIRMANIN TAHMİN EDİLEN BETON DAYANIMI ÜZERİNDEKİ ETKİSİ”.
  7. [7] ACI Committee 544, “ACI 544.4R-18: Guide for Design with Fiber-Reinforced Concrete,” ACI Stand. Comm. reports, pp. 1–33, 2018.
  8. [8] S. Jalil and A. A. Sultan, “Flexural strength of rc beams with partial replacement of concrete with hooked-steel fiber-reinforced concrete,” Jordan J. Civ. Eng., vol. 15, no. 4, pp. 586–596, 2021.
  9. [9] J. Vanlalruata and C. Marthong, “Effect of cold joint on the flexural strength of RC beam,” J. Struct. Integr. Maint., vol. 6, no. 1, pp. 28–36, 2021, doi: 10.1080/24705314.2020.1823556.
  10. [10] P. Paramasivam and M. A. Mansur, “Tensile and Flexural Behavior of Joints in Ferrocement Construction,” in Journal Proceedings, 1985, pp. 710–715.
  11. [11] B. Djazmati and J. A. Pincheira, “Shear stiffness and strength of horizontal construction joints,” Struct. J., vol. 101, no. 4, pp. 484–493, 2004.
  12. [12] N. N. Gerges, C. A. Issa, and S. Fawaz, “The effect of construction joints on the flexural bending capacity of singly reinforced beams,” Case Stud. Constr. Mater., vol. 5, pp. 112–123, 2016, doi: 10.1016/j.cscm.2016.09.004.
  13. [13] H.-O. Jang, H.-S. Lee, K. Cho, and J. Kim, “Experimental study on shear performance of plain construction joints integrated with ultra-high performance concrete (UHPC),” Constr. Build. Mater., vol. 152, pp. 16–23, 2017.
  14. [14] C. A. Issa, N. N. Gerges, and S. Fawaz, “The effect of concrete vertical construction joints on the modulus of rupture,” Case Stud. Constr. Mater., vol. 1, pp. 25–32, 2014.
  15. [15] Q. Abdul-Majeed, “Evaluation of Transverse Construction Joints of Reinforced Concrete Beams,” Eng. Technol. J., vol. 28, no. 14, pp. 4750–4773, 2010.
  16. [16] A. N. Abbas, H. K. Al-Naely, H. H. Abdulzahra, and Z. S. Al-Khafaji, “Structural behavior of reinforced concrete beams having construction joint at different elevation,” Int. J. Civ. Eng. Technol., vol. 9, pp. 712–720, 2018.
  17. [17] O. A. Qasim, “EXPERIMENTAL INVESTIGATION OF CONSTRUCTION JOINTS TYPES EFFECT ON PERFORMANCE OF CONCRETE PRISMS”.
  18. [18] C. ASTM, “94, Standard Specification for Ready Mixed Concrete.” American Society for Testing and Materials, West Conshohocken, PA, 1916.
  19. [19] A. ASTM, “C150/C150M-17, standard specification for Portland cement,” Am. Soc. Test. Mater. West Conshohocken, PA, USA, 2017.
  20. [20] A. C33-78, “Standard Specification for Concrete Aggregates 1.” ASTM International West Conshohocken, 2010.
  21. [21] S. ASTM, “Standard specification for deformed and plain carbon-steel bars for concrete reinforcement,” ASTM A615/A615M-09b, 2009.
  22. [22] M. A. Ismael, Y. M. Hameed, and H. J. Abd, “Effect of construction joint on structural performance of reinforced self-compacting concrete beams,” Int. J. Civ. Eng. Technol. (IJCIET), 10, pp. 297–306, 2019.