Experimental Study on the Flexural Behavior of Reinforced Polystyrene Blocks in Concrete Beams


Lim Yong Tat(1*), Ling Jen Hua(2), Lau Ji Wei(3), Alicia Yik Yee Min(4)

(1) School of Engineering and Technology, University College of Technology Sarawak, Sibu, Sarawak, MALAYSIA
(2) School of Engineering and Technology, University College of Technology Sarawak, Sibu, Sarawak, MALAYSIA
(3) School of Engineering and Technology, University College of Technology Sarawak, Sibu, Sarawak, MALAYSIA
(4) School of Engineering and Technology, University College of Technology Sarawak, Sibu, Sarawak, MALAYSIA
(*) Corresponding Author


A new type of lightweight beam system was recently proposed by embedding polystyrene in beams to improve structural efficiency. This removes the non-performing concrete in the neutral axis and tension region to provide a comparable strength as a solid beam. There are, however, limited studies conducted to investigate the structural behavior of such beams. Therefore, this research presents an experimental investigation to assess the effect of polystyrene shapes in the beams. This involved testing a solid beam and five lightweight beams under flexural load using a four-point load test. The inclusion of polystyrene was estimated to have reduced the self-weight of beams by 8.6% to 11.8% when compared with the solid beam. The results also showed the ellipse polystyrene with a width of 70 mm and height of 50 mm produced the highest effective strength to weight ratio (sw) of 1.12 and performed 12% better than the solid beam. Moreover, the lightweight beams have more weight reduced than the strength, and those with ellipse polystyrene were found to have performed better than circular ones based on first crack load, ultimate load, and effective strength to weight ratio (sw). The beams with ellipse polystyrene allowed better stress distribution and this gave them a higher strength than sphere shape. For industry application, the polystyrene content is recommended to be greater than 10% while the effective strength to weight ratio (sw) of the beam is greater than 1. The successful reduction of the weight without affecting the structural performance has the ability to help in reducing construction costs.


Reinforced concrete; Lightweight system; Polystyrene blocks; Shape; Beam.

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Ahmad, J.H.A. and Hadi, N.G.M., 2014. Structural Behavior of Reinforced Concrete Hollow Beams under Partial Uniformly Distributed Load. International Journal of Engineering, 20, pp. 130 – 145.

British Standard, 2009. Testing Hardened Concrete, BS EN 12390-3: 2009. United Kingdom: British Standards Institution.

British Standard, 2016. Metallic Materials – Tensile Testing, BS EN ISO 6892-1: 2016. United Kingdom: British Standards Institution.

Chung, J.H., Park, J.H., Choi, H.K., Lee, S.C. and Choi, C.S., 2010. An Analytical Study on the Impact of Hollow Shapes in Bi-axial Hollow Slabs. Fracture Mechanics of Concrete and Concrete Structures, 30, pp. 1729 – 1736.

Hai, L.V., Hung, V. D., Thi, T. M., Thoi, T.N. and Phuoc, N.T., 2013. The Experimental Analysis of Bubble Deck Slab using Modified Elliptical Balls. In: Proceedings of the Thirteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-13), Japan, pp. 1 – 9.

Jesudhason, W.G. and Hemalatha, G., 2014. Experimental Investigation on Beams Partial Replacement below the Neutral Axis. In: National Conference on Technological Innovations in Structural Engineering, pp. 567 – 898.

Kum, Y.J., 2011. Cracking Mode and Shear Strength of Lightweight Concrete Beams. PhD Thesis. National University of Singapore.

Manikandan, S., Dharnar, S. and Robertravi, S., 2015. Experimental Study on Flexural Behaviour of Reinforced Concrete Hollow Core Sandwich Beams. International Journal of Advance Research in Science and Engineering, 4, pp. 937 – 946.

Mathew, I. and Varghese, S.M., 2016. Experimental Study on Partial Replacement of Concrete In and Below Neutral Axis of Beam. International Journal of Innovative Research In Technology, 3, pp.188-192.

Moayyad, M.A. and Naiem, M.A., 2013. Shear Reinforcements in the Reinforced Concrete Beams. American Journal of Engineering Research (AJER), 2, pp. 191 – 199.

Mohamad, S.Y. and Ramli, A., 2012. Reinforced Concrete Design to Eurocode 2. Malaysia: University Teknologi Malaysia.

Nor, F.Z. and Roslli, N.M., 2014. The Effects of Inclined Shear Reinforcement in Reinforced Concrete Beam, pp. 138 – 149.

Lim, Y.T. and Ling, J.H., 2019. Incorporating Lightweight Materials in Reinforced Concrete Beams and Slabs – A Review. Borneo Journal of Sciences and Technology, 1, pp. 16 – 26.

Shaaban, I.G., Shaheen, Y.B., Elsayed, E.L., Kamal, O.A. and Adesina, P.A., 2018. Flexural Behaviour and Theoretical Prediction of Lightweight Ferrocement Composite Beams. Case Studies in Construction Materials, 9, pp. 204.

Thaar, S.S A., 2015. Reinforced Concrete Moderate Deep Beams with Embedded PVC Pipes. Wasit Journal of Engineering Science, 3, pp.19-29.

Zainorizuan, M.J., Koh, H.B., Shahrul, N.M., Ismail, M., Hissyam, H. and Nurul, H.H., 2016. Structural Behavior of Short-Span Reinforced Concrete Beams with Foamed Concrete Infill. ARPN Journal of Engineering and Applied Sciences, 11, pp. 9820 – 9825.

DOI: https://doi.org/10.22146/jcef.62346

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