Harris Angelakopoulos - Research Student
email : H.Angelakopoulos@sheffield.ac.uk
Recycled Steel Fibre Reinforced Roller Compacted Concrete
The main objective of the project is to develop steel fibre-reinforced concrete mixes suitable for slip forming and roller compaction which have reduced energy requirements and use recycled materials. Both industrial fibre reinforcement and fibres from recycled tyres will be employed, as well as recycled aggregates, pulverised fuel ash and low energy cements to further reduce costs and energy required.
The work will start with a comprehensive literature review in the use and design of fibres in concrete pavements, which will determine the ideal characteristics for fibres to be used in wet and roller compacted concrete. This study will also examine fibres recovered from other waste streams.
Several mixes containing recycled materials (cement and aggregates) as well as low energy cement will be developed in the second stage of the project. Trial mixes will be used and the initial optimisation will take place on the basis of the workability of wet mixes and density of compacted dry mixes. This task will also aid the determination of the desirable fibre characteristics for inclusion in concrete.
Flexural testing of prisms using international standards (RILEM and JCS) will take place in parallel to evaluate the characteristics of the developed SFRC mixes. In addition, chemical durability tests will be carried out to assess the resistance of the developed SFRC mixes to the main aggressive agents that surface transport infrastructure is normally subjected to.
Numerical analysis (both finite element and cross-sectional analyses) will be performed to develop models for the material characterisation of SFRC.
The benefits of the new construction concept will be manifold, such as to reduce construction costs by 10-20%, reduce construction time by 15%, reduce the energy consumption in road construction by 40%, minimise maintenance, use waste materials in road construction and make tyre recycling more economically attractive.
To achieve its objectives the project as part of the EcoLanes project will work closely with experts from 5 countries in order to overcome serious scientific and technological barriers in fibre processing, concrete manufacture and road design.
It is anticipated that the project will contribute to the development of new processes and design guidelines, and will deliver full-scale demonstration projects in three diverse European climates and economies.
This research project is sponsored by the European Community Framework Programme for Research, Technological Development and Demonstration (SIXTH FRAMEWORK PROGRAMME PRIORITY 6.2, SUSTAINABLE SURFACE TRANSPORT)