RILEM TC 195-DTD (2002-2006): Round Robin Test Program on Free Deformation Rigs; Planning, Test Results, and Statistical Evaluation

摘要

In order to evaluate concretes in terms of crack sensitivity in the hardening phase it is essential to quantify thermal dilation (TD) and autogenous deformation (AD) in laboratory tests. Many laboratories performed such tests using different techniques for linear and volumetric measurements. The paper presents the results from a RR-program performed within the RILEM committee TC 195-DTD where 10 laboratories were represented and totally 30 Dilation Rig tests (linear test set-ups) were performed. For simplicity the nominal test condition for the RR was 20 °C isothermal temperature; i.e. the scope was to measure only the effect of AD. The results showed that fresh concrete properties varied significantly in the various laboratories and this, amongst others, appears to have contributed to variations in the measured AD. The coefficient of variation (COV) of AD is significantly larger than for mechanical properties.