Naeimeh Jafarifar - Research Student
email : email@example.com
STRUCTURAL BEHAVIOUR OF STEEL-FIBRE-REINFORCED-CONCRETE PAVEMENTS
The use of steel fibres in concrete pavements is increasing due to ease of construction compared with conventional reinforcement. The possibility of using recycled steel fibres (e.g. those produced from post-consumer tyres), recycled aggregates and low energy cement combined with roller compaction technology can make concrete pavements more economical and environmentally friendly. This is the subject of a European project called "Ecolanes" aiming to develop long-lasting-rigid pavements for roads.
The structural behaviour of steel-fibre-reinforced-concrete (SFRC) roads under repetitive traffic load until now little is known on. Most of the existing design codes, developed for industrial or transportation ground slabs, are based on elastic theories for design of plain and conventionally reinforced concrete. These codes (e.g. ACI) have not been fully adopted yet for fibre reinforced concrete to take into account the post-cracking load bearing capacity of slabs-on-ground. Other codes (e.g. Concrete Society) use the ultimate limit state concept for fibre reinforced ground floors, but only partially, since cracking is only allowed to occur on the bottom surface of the slab. Though this method may be more economical, it does not consider the highly repetitive nature of traffic loads which may cause considerable degradation in the mechanical properties of the pavement and foundation.
The aim of this research is to examine the above issues through numerical modelling coupled with extensive experimental work. However, due to limited information on post-cracking capacity of SFRC subjected to repeated loading and possibly plastic behaviour of soil (caused by consolidation), accurate simulation of SFRC pavements is a challenging task.