Control of cracking caused by deformation in concrete
This lunchtime webinar will discuss new CIRIA guidance. C766 is intended to be Eurocode EC2 compliant throughout with regard to the properties of concrete and the design of reinforcement. It aims to give a method for checking that the reinforcement provided will be sufficient to control short term and long term cracking.
Background
Cracking occurs when the tensile strain, arising from either restrained contraction or the strain differential within the concrete section, exceeds the tensile strain capacity of the concrete. Autogenous shrinkage also contributes to early contraction and drying shrinkage and annual temperature variations are added to early-age effects over the long term. Numerous factors influence the risk of early-age cracking.
This guide provides a method for estimating the magnitude of crack-inducing strain and the risk of cracking at both early-age and over the long term. Where cracking is predicted guidance is provided on the design of reinforcement to control crack widths. Measures are described to minimise the risk including selection of materials and mix design, planning pour sizes and construction sequence, the use of insulation to reduce thermal gradients, the use of movement joints, and cooling of the concrete either before placing or in situ.
The principal objective of the guide is to give a method for checking that the reinforcement provided will be sufficient to control early age cracking, while also being adequate for controlling cracks that may develop due to long-term deformations caused by temperature change and shrinkage.
Programme
12:15 Webinar available to log on
12:30 CIRIA introduction
12:35 Author presentations:
- Phil Bamforth, Independent consultant
- Derek Winsor, Mott MacDonald
13:15 Q&A
13:30 Webinar ends
Who should attend?
Reinforced concrete designers and specifiers, concrete technologists and structural engineers
Fees
Free for CIRIA Members
All others: £35+VAT.
Registration will close at 11:00 on Thursday 14th March
Booking
If you are experiencing issues registering for this event online please contact us on
020 7549 3300 or email [email protected]
You will receive a confirmation 10 days prior to the event.
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Further information
For further information on CIRIA membership and other services, please contact:
Tel: 020 7549 3300
Fax: 020 7549 3349
Email: [email protected]
Web: www.ciria.org