7 December 202118:00 - 19:00 GMT
Sprayed concrete is a widely used construction technique for new infrastructure. In the UK, several tunnelling projects including Thames Tideway have employed sprayed concrete for the tunnel lining; sections of tunnels on HS2 will also include a sprayed concrete lining.
It can offer several advantages over more conventionally cast concrete. The requirements for rapid setting, early age strength development, good pumpability and good bond to the substrate, however this leads to the use of cement rich mixes mainly using CEM I, resulting in a relatively high carbon footprint.
The use of supplementary cementitious materials (SCMs) in sprayed concrete as a way of lowering the carbon footprint has hitherto been relatively limited compared to other cast in situ applications due to their slower strength development.
This presentation describes research funded by the IStructE where as much as 80% of the CEMI has been replaced with GGBS, hence substantially reducing the carbon footprint, whilst still meeting the required performance requirements of typical infrastructure specifications such as HS2.
Chris an experienced Civil Engineer, Chartered Builder and Researcher with 25 years’ experience of all aspects of construction, including contracting, consultancy and research.
He is currently Director of the Centre for Innovative and Collaborative Construction Engineering (CICE) in Loughborough’s School of Architecture, Building and Civil Engineering, and a Professor in Construction Engineering and Materials.
His PhD was in sprayed mortars and concretes, and he worked previously for seven years for Laing O’Rourke, BRE, and as an international construction Expert Witness.
Michael is a Chartered Senior Civil Engineer with 12 years’ experience currently working with Arup in their infrastructure team in the Nottingham office.
He has considerable materials knowledge gained from working on projects where specialist concretes have been used in novel Civil Engineering applications including Heavy Weight Concrete in a floating track slab on Crossrail.
Michael is mobilised as part of the DH concrete team on the SCS S1 & S2 contract and holds an MSc in Advanced Concrete Technology.
The presentation will also involve a Q&A Expert Panel incorporating the speakers plus:Stuart Manning, Shotcrete Services Ltd - a sprayed concrete contractor with two generations worth of materials, machinery, equipment and application experience. John Reddy, Ecocem - GGBS and powdered accelerator suppliers.Dr Chris Peaston, Peaston Concrete Consultancy - a materials specialist with a particular expertise based on 35 years’ experience in sprayed and fibre concretes, and a co-author of the HS2 S1 & S2 SCL specification.One hour of CPD.
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