Effect of hybrid polypropylene-steel fibres on strength characteristics of UHPFRC

Peem Nuaklong , Jithaporn Chittanurak , Pitcha Jongvivatsakul , Withit Pansuk , Akhrawat Lenwari , Suched Likitlersuang

Abstract

This study intends to produce an ultra-high performance fibre reinforced concrete (UHPFRC) made with hybrid fibres (i.e., steel and polypropylene). Compressive and tensile strength characteristics of the hybrid fibres UHPFRC are considered. A total of 14 fibre-reinforced composites (FRCs) with different fibre contents or types of fibres were prepared and tested in order to determine a suitable hybrid fibre combination. The compressive and tensile strengths of each concrete at 7 days were determined. The results showed that a hybrid mix of micro-polypropylene and steel fibres exhibited good compromising performances and is the ideal reinforcement mixture in a strong, cost-effective UHPFRC. In addition, maximum compressive strength of 167 MPa was achieved for UHPFRC using 1.5% steel fibres blended with 0.5% macro-polypropylene fibres.

Key Words

ultra-high performance fibre reinforced concrete; steel fibre; polypropylene fibre; hybrid fibres; compressive strength; tensile strength

Address

Peem Nuaklong, Jithaporn Chittanurak, Pitcha Jongvivatsakul, Withit Pansuk — Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
Akhrawat Lenwari — Composite Structures Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
Suched Likitlersuang — Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand

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