Control of cracking caused by deformation in concrete
This webinar introduces CIRIA's guide C766 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 is sufficient to control short- and long-term cracking.
REGISTRATION IS NOW CLOSED
Background
Cracking occurs when the tensile strain exceeds the concrete’s capacity arising from restrained contraction or the strain differential within the concrete section. Autogenous shrinkage also contributes to early contraction. Drying shrinkage and annual temperature variations add to early-age effects over the long-term. Numerous factors influence the risk of early-age cracking.
CIRIA’s guide ‘Control of cracking caused by deformation in concrete’ 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 outlined 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
• 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.
Who should attend?
• Reinforced concrete designers and specifiers
• Concrete technologists
• Structural engineers
Why attend?
• Gain insight from the authors into the significant benefits of CIRIA guide C766 and
how it addresses previous concerns relating to reinforcement congestion experienced
using EC2 part 3 and CIRIA C660.
• Understand the strain behaviour of a structural element and how to determine the
appropriate restraint.
• Discover how crack width calculations for durability and water resistance are
dependent upon minimum cover, and how using the amendment in C766 has a
surprising benefit in reinforcement provision.
• Learn how C766 recognises situations that typically exist with ground water pressure,
where the crack width can be significantly relaxed if the applied load has a low
variation.
When
Tuesday 16 June 2020
11:00 - 12:00
Programme
11:00 Welcome and introduction
Tony Jones, Principal Structural Engineer, The Concrete Centre
11:05 An overview of CIRIA's guide on 'Control of cracking caused by deformation
in concrete'
Phil Bamforth, Independent Consultant
11:25 Design seepage of cracks: a practical application of CIRIA C766
Derek Winsor, former Divisional Director, Foundations and Geotechnics,
Mott Macdonald
11:45 Discussion and Q&A
Moderator: Tony Jones, Principal Structural Engineer, The Concrete Centre
12:00 Closing remarks
We recommend you join the webinar ten minutes before the scheduled start time.
Registration Fee
CIRIA Members: Free
Non-members: £35 + VAT
Booking
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