Abstract
This paper describes a numerical thermo-mechanical model for concrete pavement, implemented in OOFEM software. The thermal part is a heat transfer problem with appropriate initial and boundary conditions (sun irradiation, radiation and convection), calibrated from experimental data. Heat release from cement hydration is also included, calibrated for commonly used cements to demonstrate the difference that can be achieved with the binder selection. The mechanical part of the problem is composed of a 3D elastic concrete slab, subsoil Winkler-Pasternak elements and 1D interface elements, allowing separation in tension. The Winkler-Pasternak constants C1 and C2 were firstly determined from TP170 document and refined later from static load tests on the highway. The model validates well temperature field, static load test and provide several useful insight such as feasible time for summer casting, stress/strain fields and slab separation from the base.
Highlights
Durability of concrete pavements presents important research topic in the world and in the Czech Republic
One of them lies in choosing suitable binder, where hydration kinetics and microdefects take place [3]
The boundary conditions for the thermal task are derived from measured data and are approximated into simple functions
Summary
Durability of concrete pavements presents important research topic in the world and in the Czech Republic. Adopted design approaches still heavily relies on Westergaard’s theory, resulting in dominant wheel load over temperature effects [1]. One of them lies in choosing suitable binder, where hydration kinetics and microdefects take place [3] To demonstrate this decisive factor for durability, an experimental pilot section on a newly built part of the D1 highway was carried out, using slag-blended binder with slow hydration kinetics[4]. There are several measured quantities, such as air temperature, sun irradiation, temperature of concrete and strains in several points in the slab. The boundary conditions for the thermal task are derived from measured data (air temperature, sun irradiation and radiation) and are approximated into simple functions. The soil is described with Winkler-Pasternak elements, the two parameters C1 and C2 are determined from comparison with 3D continuum model and with elastic properties from TP170 [1] and from static load test results
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