Scope
There is a push for performance-based concrete design at the expense of deemed to satisfy approaches. This also pushes for more performance testing. There are several test standards that can be used to quantify concrete frost resistance, e.g. ASTM C666, ASTM C672, and CEN/TS 12390-9, where the later contains three different test methods to choose from. In addition, a number of product standards for concrete products also specify different accelerated freeze-thaw methods.
The aim of the workshop is to discuss the results of recent years' research in relation to accelerated freeze-thaw testing of concrete. For example:
How well does specific methods represent field conditions?
Even the test principle is similar, test methods differ in specific parameters. The three test methods in CEN/TS 12390-9 (slab test, cube test, and CDF test, respectively) e.g. differ with respect to
- duration of capillary suction prior to freeze/thaw (slab: 3 days; cube: 1 day; CDF: 7 days)
- type of liquid used for capillary suction (slab: pure water; cube & CDF: 3% NaCl)
- amount of freezing medium relative to test surface (slab: 3 mm; CDF: 5 mm; cube > 10 mm)
- Temperature cycle (slab: 24 h; cube: 24 h (not identical to slab cycle); CDF: 12 h) How does choice of specific parameters influence the test result?
Are some test methods more or less favorable for concrete with supplementary cementitious materials (SCM)?
How can reproducibility be improved and inter-laboratory variations be limited?
The workshop is not limited to the above questions - they are only meant as inspiration. All presentations related to the over-all topic "Accelerated freeze-thaw testing of concrete" are welcome.
Organizing committee
If you need further information on top of what is stated in the following pages, please contact the organizing committee:
Associate professor Marianne Tange Hasholt (matah@byg.dtu.dk), Dept. of Civil Engineering, Technical University of Denmark
Associate professor Katja Frid (katja.frid@mau.se), Dept. of Materials Science and Applied Mathematics, Malmö University
Proceedings
There will be no workshop proceedings. It is planned to submit an extensive workshop summary to the journal "Nordic Concrete Research". All workshop presenters will be asked if they would like to co- author the summary.
Registration
Registration of presentations
We already have a more or less full workshop program, but if you have something that you would like to present, please send a mail including
Headline
Short summary (100-200 words)
to Marianne Tange Hasholt (matah@byg.dtu.dk) as soon as possible and no later than 20 March 2022. Then the workshop organizers will try to fit it in.
Registration of workshop participation
If you would like to participate in the workshop, please register here: www.conferencemanager.dk/ncr-2022.
Fee: DKK 1500 (approx. 200 EUR).
The fee includes lunch and refreshments during the day at DTU, transport to the workshop dinner venue and workshop dinner.
In the ConferenceManager registration system, there is a textbox for comments. Please state in this textbox, if you have any food allergies, etc.
Program, Wednesday 20th April 2022 (download programme)
In each time slot for presentations, there will be 2-3 presentations (15-20 minutes each) related to the overall topic, followed by time for discussion among all participants.
Morning
09.00-09.30 Registration & coffee
09.30-09.45 Introduction
09.45-10.30 Studies involving observations from the field
Frank Spörel
Freeze-thaw attack and concrete resistance in the CIF-test and under field-conditions
- a data-based view on relevant parameters
Jukka Lahdensivu
Freeze-thaw damage in existing Finnish concrete facades and balconies
10.30-10.45 Coffee break
10.45-12.00 The importance of Interactions with the surroundings, other than just the freezing temperature
Elisabeth Helsing & Peter Utgenannt
Influence of carbonation on the salt-frost resistance and possibilities to incorporate this factor in freeze-thaw testing
Matthias Müller
Testing salt frost scaling resistance of XF2 concretes
Marianne Tange Hasholt
Interaction between concrete and freezing medium during accelerated freeze-thaw testing
12.00-13.00 Lunch
Afternoon
13.00-15.30 The importance of the temperature curve
Abdul Faheem
Influence of thermal boundary conditions and temperature distribution in concrete on frost scaling (results from a recent PhD project)
Terje Rønning
Alternative temperature cycle during accelerated freeze-thaw testing
Short break
The frost damage mechanism
Katja Frid
Study that tells us how air voids really work
Stefan Jacobsen
Shape and size of particles scaled from concrete surfaces during salt frost testing and rapid freezing and thawing in water
15.30-16.00 Coffee break
16.00-17.00 Final discussion and closure
17.00-18.00 Mini-excursion to see old and new concrete structures in the vicinity of Copenhagen (the excursion is at the same time our transport to the workshop dinner venue)
18.00- Workshop dinner at Restaurant Tårnet in downtown Copenhagen (see "Practical details" next page for more information)