Samuel English

School of Planning Architecture and Civil Engineering
David Keir Building, Stranmillis Rd, BT9 5AG, Belfast
Room OG 312.A
senglish04@qub.ac.uk

Education

Masters of Structural Engineering with Architecture (Hons) Queen’s University Belfast.

PhD Title

Shear and punching shear performance of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) for bridge applications

PhD project Description

UHPFRC as the name suggests is a mix of ultra high performance concrete with a percentage, by volume, of steel or synthetic fibres, normally between 2-3%. The curing process consists of heating the material to a high temperature (90oC) at a humidity close to saturation for approximately 48 hours. The resulting material is extremely compact with remarkable mechanical and durability performances.

High strength concrete can easily achieve compressive strengths greater than 150 MPa but the failure mechanism is very brittle. In fact the failure in compression can be explosive with no evidence of a plastic domain. UHPFRC can achieve tensile strengths in the range of 8-11 MPa and above. The addition of fibres help to provide a non-brittle mechanism in bending and significantly increase the fracture toughness. UHPFRC is characterised by its psuedo-strain hardening and strain softening.

UHPFRC appears to be a promising new material not only because of its enhanced ductility but also because the mixing and casting procedures are no different to existing procedures for normal and high strength concretes. UHPFRC is, however, substantially more expensive than conventional and even High Performance Concrete. It is therefore appropriate to identify applications which fully utilize UHPFRC's mechanical properties and performance characteristics. The precast manufacturing process seems to be a promising area to develop more economical UHPFRC sections mainly due to the fact that it can have a quick turnaround period and can produce varied sections. The other aspect of precast manufacturing is the quality control and heat treatment available which is inevitably needed in the manufacturing of UHPFRC.

The aim of this research is to understand the shear performance of UHPFRC and use numerical modeling to develop applications that fully utilize the superior properties of this concrete. 

Supervisors

Prof. Jian- Fei Chen, Dr. Desmond Robinson & Prof. Marios Soutsos

Qualifications

Masters of Structural Engineering with Architecture (Hons) Queen’s University Belfast. 

Publications / Media

N/A

Research Interests

Ultra high performance concrete, shear, punching shear, fracture mechanics, FE modeling, composite materials

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