Estimation of the Grid Reinforcement Influence on Asphalt Plate Behaviour through FEM Analysis and Laboratory Testing
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 1, Issue 4
Abstract
The paper deals with finite element modelling of the test carried out on plate samples made of asphalt mixture and reinforced with glass grid. The apparatus constructed for testing of plate samples in the large scale is modelled in detail as a contact problem. All materials are assumed to be linearly elastic and isotropic, and stiffness modulus of the asphalt mixture is determined on the samples cut out from the plate. The finite element solutions of the static indentation of the sample resting on elastic support with a circular steel indenter have shown that the grid reinforcement influence the overall behavior of the sample only in non-standard loading cases causing inhomogeneity of stress and strain fields or when the ratio between stiffness of the reinforced material and reinforcement material is particularly high (for example in case of asphalt mixtures at higher temperatures). The second conclusion was proven experimentally in the fatigue test carried out on reinforced and non-reinforced asphalt (HMAC 16 20/30) plate in two different temperatures equal to 10 and 30[oC]. In the higher temperature the maximum norm of the vertical displacement is increasing faster for non-reinforced plate than for the reinforced one. In designing and production of the pavements the glass, steel and carbon fiber grids are more often used [1-7]. Nevertheless, in the direct designing calculations, the grid reinforcement is not included. The application of the grid is taken into account through some transfer function allowing thickness reduction ofthe pavement layers. It is caused by the fact that in road laboratories there is no standard test, in which the influence of the reinforcing grid on the behaviour of the layered pavement is taken into account. In the paper [3], a laboratory test was proposed in which the influence of the reinforcing grid can be taken into consideration. The tests are carried out on plate samples with maximum size of 40x40x15 [cm], in which a grid with large mesh dimension can be placed while maintaining the representativeness of the sample, see (Figures 1 & 2). The influence of reinforcing grid on pavement behavior using the finite element method (FEM) can also be analyzed, cf. [8,9]. In FEM simulations, the most difficult problem is to characterize the physical behaviour of the so-called interface, i.e.the region of connection of the pavement layers with each other, which can additionally be enriched with reinforcing grid. It can be concluded that the constitutive models of road materials are quite well developed [10-13], while the interface models require refinement and experimental verification [2,14]. To carry out this verification indirectly the apparatus proposed in [3] may also be used. In this apparatus installed in a standard testing machine with a temperature chamber, the static, dynamic and fatigue tests can be carried out taking into account also the temperature influence. In the paper the FEM analysis of the static indentation test of reinforced asphalt plate resting on elastic foundation are presented in comparison with non-reinforced sample. The detailed analysis is presented, proving that the grid reinforcement is influencing mainly non-standard situations like local pavement damage, sub grade slipping, thermal cracking [15-17] etc. When pavement is working in the designing state, the grid reinforcement is not influencing its behavior much. This conclusion is supported by results of the fatigue experiment carried out on reinforced and non-reinforced asphalt plate in two different temperatures equal to 10 and 30 [ oC]. In the higher temperature the maximum norm of the vertical displacement is increasing faster for non-reinforced plate than for the reinforced one (Figure 1).
Authors and Affiliations
Gajewski Marcin, Gajewska Beata
Keywords
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- EP ID EP605074
- DOI 10.32474/TCEIA.2018.01.000116
- Views 67
- Downloads 0
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