This report presents the Round-Robin (RR) program and test results
including a statistical evaluation of the RILEM TC195-DTD committee
named "Recommendation for test methods for autogenous deformation (AD)
and thermal dilation (TD) of early age concrete". The task of the
committee was to investigate the linear test set-up for AD and TD
measurements (Dilation Rigs) in the period from setting to the end of
the hardening phase some weeks after. These are the stress-inducing
deformations in a hardening concrete structure subjected to restraint
conditions.
The main task was to carry out an RR program on testing of AD of one
concrete at 20 °C isothermal conditions in Dilation Rigs. The concrete
part materials were distributed to 10 laboratories (Canada, Denmark,
France, Germany, Japan, The Netherlands, Norway, Sweden and USA), and in
total 30 tests on AD were carried out. Some supporting tests were also
performed, as well as a smaller RR on cement paste. The committee has
worked out a test procedure recommendation which is reported separately
and submitted acceptance as a RILEM method.