Structural Behavior of Hollow-core One Way Slabs of High Strength Self-compacting Concrete

Document Type : Original Article


Civil Engineering Department, College of Engineering, University of Diyala, Diyala, Iraq


Reinforced concrete hollow-core slab (HCS) is a new type of lightweight slabs in which the longitudinal voids provide the ability to reduce the concrete amount. Reducing the concrete amount causes a reduction of the dead loads which consequently leads to cost-saving, fast construction, and getting long-span. The experimental program includes constructing and testing slab species with dimensions 1700×435×125mm to investigate the effect of eliminating concrete ratio by changing the size of the longitudinal void and the number of longitudinal voids on the performance of HCS. The experimental results showed that elimination of the concrete with percentages 10.83, 17.20 and 24.37% from the hollow-core high strength slabs using three longitudinal voids of diameters 50, 63, and 75mm, respectively, resulted in saving the ultimate strength by 90.06, 87.84 and 85.07%, and increasing the ultimate deflection by 5.48, 10.80 and 17.44%. While, elimination of the concrete with percentages 16.25, 24.37 and 32.50% from the hollow-core high strength slabs using two, three, and four longitudinal voids of 75mm diameter resulted in saving the ultimate strength with percentages 89.29, 85.07 and 80.61%, and increasing the ultimate deflection with percentages 7.57, 17.44 and 22.81% respectively when compared with the reference solid slab.


1.     Mosley, W. H. & Bungey, J. H., “Reinforced Concrete Design”, Third edition, Macmillan, (2012).
2.     Marais, C. C., “Design Adjustment Factors and the Economical Application of Concrete Flat-slabs with Internal Spherical Voids in South Africa” (Doctoral dissertation, University of Pretoria),‏ (2009).
3.     Stephen, C., “Hollow Core Manufacturing and Factory Design”,  Indian Concrete Journal, (2013), 20-25.
4.     Pajari, M., “Pure Torsion Tests on Single Hollow Core Slabs” Espoo VTT Tiedotteita, Vol. 2273, (2004), 28-29.‏
5.     Cuenca, E., & Serna, P., “Failure Modes and Shear Design of Prestressed Hollow Core Slabs Made of Fiber-reinforced Concrete”, Composites Part B: Engineering, Vol. 45, No. 1, (2013), 952-964, doi: 10.1016/j.compositesb.2012.06.005.‏
6.     Sarma, P. S. K., & Prakash, S. S., “Performance of Prestressed Hollow Core Slabs with and without Cutouts”, International Journal of Research in Engineering and Technology, Vol. 4, No. 13, (2015), 443-447, doi: 10.15623/ijret.2015.0425066.‏
7.     Kankeri, P., & Prakash, S. S., “Experimental Evaluation of Bonded Overlay and NSM GFRP Bar Strengthening on Flexural Behavior of Precast Prestressed Hollow Core Slabs”, Engineering Structures, Vol. 120, (2016), 49-57, doi: 10.1016/j.engstruct.2016.04.033.‏
8.     Al-Azzawi, A. A., & Abdul Al-Aziz, M. A., “Behavior of Reinforced Lightweight Aggregate Concrete Hollow-core Slabs”, Computers and Concrete, Vol. 21, No. 2, (2018), 117-126.
9.     Khalil, A. A., El Shafiey, T. F., Mahmoud, M. H., Baraghith, A. T., & Etman, A. E., “Shear Behavior of Innovated Composite Hollow Core Slabs”, International Conference on Advances in Structural and Geotechnical Engineering,(2019).‏
10.   Lee, Y. J., Kim, H. G., Kim, M. J., Kim, D. H., & Kim, K. H., “Shear Performance for Prestressed Concrete Hollow Core Slabs”, Applied Sciences, Vol. 10, No. 5, (2020), 1636, doi: 10.3390/app10051636.
11.   Mahdi, A. A. and Ismael M. A., “Structural Behaviour of Hollow Core Reinforced Self Compacting Concrete One Way Slabs”, IOP Conference Series: Materials Science and Engineering, Vol. 888 (2020), 10.1088/1757-899X/888/1/012019.
12.   BS 12, “Specification for Portland cement”  British Standard Institution, (1996), doi: 10.3403/00662547.
13.   B.S. 882, "Specification for Aggregates from Natural Sources for Concrete", British Standard Institution, 3-9, )1992(, doi: 10.3403/00047290u.
14.   EFNARC, F., “Specification and Guidelines for Self-compacting Concrete”, European federation of specialist construction chemicals and concrete system, (2002).
15.   ASTM C-494/C-494M, “Standard Specification for Chemical Admixtures for Concrete”, American Society for Testing and Materials, (2015), doi: 10.1520/c0494_c0494m-15a.
16.   ASTM A 615/A 615M, “Standard Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement” American Society for Testing and Materials, (2009), doi: 10.1520/a0706_a0706m-08a.
17.   Self-Compacting Concrete European Project Group, “The European guidelines for self-compacting concrete: Specification, production and use”, International Bureau for Precast Concrete (BIBM), (2005).  ‏
18.   ASTM C39/C39M, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens”, American Society for Testing and Materials, (2015), doi: 10.1520/c0039_c0039m-15a.