Concrete in a severe freezing environment: a meteorological characterization - Archive ouverte HAL
Chapitre D'ouvrage Année : 2021

Concrete in a severe freezing environment: a meteorological characterization

Résumé

When comparing the different test methods for concrete resistance to scaling and the crucial lack of correlation between laboratory test results and field results, the representativeness of these methods can be questioned. Many researchers have tried to clarify most of the mechanisms involved in the damage due to scaling, as well as thermal parameters influencing damage intensity. However, what can be noted is that predicting the degradation in relation to the mix design characteristics remains unreliable and seems to be disconnected from the performance on site. Moreover, the interpretation of the test results also presents difficulties, appearing to contradict the first-order parameters (e.g., minimum freezing temperature or freezing rate). These considerations have led us to undertake measurement campaigns to characterize the temperature response of concrete to a severe freezing environment, this environment being itself fully characterized by a set of relevant meteorological parameters measured on a field site, very close to the samples. In this paper, we present the results of 3 years of meteorological measurements (2013–2016) from two concrete blocks placed in a complete meteorological station located in a severe freezing environment. The temperature measurements were taken from an XF4 concrete block equipped with thermocouples, placed at a depth of 2 and 8.5 cm, and from the temperature of the air mass coming from a Stevenson shelter with double shelf in opposite orientation, both compared to the laboratory thermal cycle according to CEN/TC12390-9 (Slab test). While the latter gives a very symmetrical and periodic temperature signal, the former tends to be characterized by a strong asymmetry and irregularity in profile and full amplitude. We show that the natural conditions are very far from the laboratory conditions in terms of full amplitude, freezing rates and the frequency of freezing–thawing cycles. In addition, we show that these field conditions are representative of a severe freezing environment according to the EN 206 standard, in the French Alps as well as in the Nordic conditions such as can be found in Norway, Sweden and Finland.
Fichier non déposé

Dates et versions

hal-04740884 , version 1 (17-10-2024)

Identifiants

Citer

Laurent Izoret, Sara Al Haj Sleiman, Nadare Matoiri-Chaibati, Frédéric Grondin. Concrete in a severe freezing environment: a meteorological characterization. Materials and Structures, 54 (1), pp.36, 2021, ⟨10.1617/s11527-020-01603-8⟩. ⟨hal-04740884⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More