Strengthening of Self-Compacting Reinforces Concrete Slabs Using CFRP Strips Subjected to Punching shear

Nagham T. Al-Shafi’i, Sara S. Faraj, Zainab M. Hussein


This research is conducted to investigate the behavior of self-compacting reinforced concrete slabs strengthened by CFRP laminates in a stitching way under the impact of punching shear strength. In this study, trail mixes are carried out to perform high strength self-compacting concrete (f_c^'=72.3 MPa). Two groups of specimens were assessed in this study. The first group (A) involves three solid slab specimens, while the second group (B) includes three slab specimens with an opening in the shear zone. Two variables were included in these experiments, namely, the effect of strengthening by CFRP laminate and the effect of high strength self-compacting concrete. The outcomes were discussed based on cracking load, ultimate punching shear capacity, crack patterns, and load-deflection response. The results showed that strengthening by CFRP enhanced the ultimate punching shear capacity by (23%-65%) and increased the deflection by (33%-79.5%).


Self-Compacting ,Reinforces Concrete Slabs


SHEIKH, Shamim A.; HOMAM, S. Mukhtar. A decade of performance of FRP-repaired concrete structures. In: Proceedings of the ISIS-SHM 2004 Workshop. Winnipeg, Manitoba, Canada. 2004.‏

Chen, Cheng-Chih, and Chung-Yan Li. "Punching shear strength of reinforced concrete slabs strengthened with glass fiber-reinforced polymer laminates." ACI Structural Journal 102.4: pp. 535.‏ (2005)

Soudki, Khaled, Ahmed K. El-Sayed, and Tim Vanzwol. "Strengthening of concrete slab-column connections using CFRP strips." Journal of King Saud University-Engineering Sciences 24.1:pp. 25-33.‏ 2012

Sharaf, Mohamed H., Khaled A. Soudki, and Michael Van Dusen. "CFRP strengthening for punching shear of interior slab–column connections." Journal of Composites for Construction 10.5:pp. 410-418.‏ 2006

Lin, Chien-Hung, and Jiunn-Hung Chen. "Shear behavior of self-consolidating concrete beams." ACI Structural Journal 109.3: 307.‏ 2012

Guan, Hong. "Prediction of punching shear failure behaviour of slab-edge column connections with varying opening and column parameters." Advances in structural engineering 12.1: pp.19-36.‏ 2009

Moe, Johannes. Shearing strength of reinforced concrete slabs and footings under concentrated loads. Portland Cement Association, Research and Development Laboratories, 1961.

Hognestad, Eivind, Richard C. Elstner, and J. A. Hanson. "Sheer Strength of Reinforced Structural Lightweight Aggregate Concrete Slabs." Journal Proceedings. Vol. 61. No. 6. 1964.‏

El-Salakawy, Ehab F., Maria Anna Polak, and Monir H. Soliman. "Reinforced concrete slab-column edge connections with openings." Structural Journal 96.1: pp.79-87.‏ 1999

Teng, Susanto, et al. "Punching shear strength of slabs with openings and supported on rectangular columns." Structural Journal 101.5: pp. 678-687.‏ 2004

Bompa, D. V., and T. Onet. "Behaviour of Symmetric Flat-Slab Connections with Openings in the Control Perimeter." Scientific Bulletin Series D: Mining, Mineral Processing, Non-Ferrous Metallurgy, Geology and Environmental Engineering 24.2: pp. 111.‏ 2010

Iraqi Specification, No. 5. Portland cement. Central Organization For Standardization And Quality Control, Ministry of Planning, Iraq. 1984

Iraqi Specification, No.45, "Aggregate from Natural Sources for Concrete and Constructions", (1980), (in Arabic)

ASTM-C494-05. Standard Specification for Chemical Admixtures for Concrete. American Society for Testing and Material. 2005

ASTM C 1240. Standard Specification for Use of Silica Fume as a Mineral Admixture in Hydraulic-Cement Concrete, Mortar, and Grout. American Society for Testing and Material, 04(02), pp.1-6. 2003

ASTM A615/615M-05a (2005). Standard Specification for Deformed and Plain Carbon Structural Steel Bars for Concrete Reinforcement. American Society for Testing and Material standard, 01(02).

EFNARC. Specification and Guidelines for Self-Compacting Concrete. Association House, 99 West Street, Farnham, Surrey GU9 7EN, UK, 21. 2002

ASTM C 1240-05, Standard Specification for Silica Fume Used in Cementitious Mixtures. American Society for Testing and Material standard, 1-7. 2005



  • There are currently no refbacks.

Copyright (c) 2020 Nagham T. Al-Shafi’i, Sara S. Faraj, Zainab M. Hussein

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

ISSN: 2303-4521

Digital Object Identifier DOI: 10.21533/pen

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