Abstract
This paper describes the testing of effectiveness and behavior of dowels placed in transversal joints of concrete pavements, while focusing on dimensions and quality of commonly used materials. The analysis uses experimental tests in laboratory conditions which were performed independently in the Czech Republic and Slovak Republic. The comparison of quality as well as potential use of alternative materials of dowels is made with the use of developed tests focusing on main requirements, such as longitudinal displacement in cement concrete, resistance of coating to damage, and reduced potential to concrete damage. Furthermore, the paper describes and compares loading results of the relative concrete deformations around dowels by strain gauges that were analyzed. Results of deformations on beams with an inserted dowel and the findings that were observed during the measurement are presented.
Highlights
This article is an outcome of research in the Czech and Slovak Republics that aimed perform measurements of stress on beams with an inserted dowel, to assess their effectiveness and to test the concentration of tensile stress in the concrete around dowels intended for jointed plain concrete pavements (JPCP).Together with the aggregate interlock, dowels are a solution to improve interaction between slabs at transversal joints (LTE—load transfer efficiency) of concrete pavements
This paper presents the main findings of laboratory testing of dowels used in the Czech Republic and Slovakia
The results show high tensile stress in concrete around dowels and confirm the results of and Slovakia
Summary
Together with the aggregate interlock, dowels are a solution to improve interaction between slabs at transversal joints (LTE—load transfer efficiency) of concrete pavements. This technological complication may not have a long-term effect in cases when concrete is damaged along the dowels and their function may be lost. An analysis of the current JPCP loading showed another potential complication in the form of existence of high concentrations of tensile stress of concrete at faces of transversal joints around dowels and potential occurrence of microcracks in this area. Theoretical modelling results by the finite element method (FEM) method show that stress in the concrete slab increases under static and thermal loading, in the vicinity of dowels [1]. More accurate input data and results which cannot be achieved in 2D modelling start to appear with the development of computer technology and new 3D software tools [7,8,9,10]
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