TY  - CONF
A1  - Spilker, Alexandra
T1  - Development of a test procedure to determine the coefficient of thermal expansion of concrete - investigation on German concrete pavements
T2  - 13th International Symposium on Concrete Roads 2018
N2  - Knowledge of material properties is of great importance when developing new types of concrete and construction methods for road building, and for quality control and quality assurance. Physical material characteristics are likewise the basis for dimensioning and assessing the residual substance of concrete pavements. One relevant characteristic when examining thermally induced stress and deformation is the coefficient of thermal expansion (CTE) of concrete. This indicator, for example, significantly influences the longitudinal expansion of the pavement system as well as the degree of curling of slabs and joint movements. Extensive tests were conducted during the technical engineering assessment of the structural substance of concrete pavements in the German motorway network, including tests to determine the CTE of existing types of concrete. Because no standardised procedure currently exists in Germany for using tests to determine the CTE of concrete, the initial task was to develop a suitable test procedure from a road-building perspective, taking consideration of the national prevailing structural conditions. This article presents the results of selected status analyses, in which the CTE was determined for a total of 656 individual samples. The values calculated for the top and bottom drilled core layer are in the range 8.9 – 13.2 x 10-6/K, whereby the average CTE assumes a value of 10.7 x 10-6/K. The deviations of the CTEs from the bottom and top drilled core layer are in principle significantly below the limitation to a maximum of 2.50 x 10-6/K recommended in literature.
KW  - Calculation
KW  - Coefficient
KW  - Concrete
KW  - Deformation
KW  - Expansion
KW  - Measurement
KW  - Properties
KW  - Rigid pavement
KW  - Temperature
KW  - Test method
KW  - Ausdehnung (mater)
KW  - Berechnung
KW  - Beton
KW  - Betonstraße (Oberbau)
KW  - Eigenschaft
KW  - Koeffizient
KW  - Messung
KW  - Prüfverfahren
KW  - Temperatur
KW  - Verformung
Y1  - 2019
UR  - https://bast.opus.hbz-nrw.de/frontdoor/index/index/docId/2252
PB  - FGSV Verlag
CY  - Köln
ER  -