Experiment-based modelling of the mechanical behaviour of non-hazardous waste incineration bottom ashes treated by hydraulic binder

Abstract

Instrumented indentation tests have been carried out on an isolated 25 mm diameter particle of Non-Hazardous Waste Incineration bottom ash. These tests have enabled one to assess the intrinsic mean reduced modulus of elasticity “Er” of the particles. This result is used as input data for a 3D numerical model of Representative Elementary Volumes (REV) of a road gravel made with this kind of by-products. This numerical model is based on a multi-scale hierarchical modelling strategy. The aggregates treated with cement have been decomposed into two REV at the sub-mesoscopic and mesoscopic scales. The numerical simulations campaign (“virtual laboratory”) lead to the following results. At the sub-mesoscopic scale, we determined the input parameters for the Concrete Damaged Plasticity Model (CDPM) used at the mesoscopic scale. At the mesoscopic scale, the mechanical characteristics of the road aggregates usually determined through experiments have been found. The non-hazardous waste incineration bottom ashes treated by hydraulic binder was classified into mechanical classe 3.

Original Experimental Campaign of Indentation Instrumented on Aggregates of Non-Hazardous Waste Incineration Bottom Ash to Study the Heterogeneity of their Rigidity

“…These are: three successive "loading-unloading" phases, a loading phase held constant for 100s and an unloading phase during which the reduced elastic modulus "Er" is determined. The principle of instrumented indentation and calculation method of reduced elastic modulus is detailed in [2,6]. Two sets of tests were performed using two types of spherical tungsten carbide indenter whose mechanical characteristics are known; they are shown in Fig.…”

“…Aggregates that comply with the current regulations can be used for road engineering in earthworks, embankments, road layers, car parks, roads and sanitation. NHWI bottom ash similar to a porous granular material in the form of a heterogeneous dark grey mixture of slag, ferrous and non-ferrous metals, glass particles, ceramics and unburnt [2]. They are used for the most part in the field of civil engineering with 80% of the production.…”

“…"Oliver and Pharr" method [3] is used to determine the reduced elastic moduli "Er". Mechanical characteristics such as the elastic modulus serve as input data for a 3D numerical model of Representative Elementary Volumes of a road gravel made with this kind of by-products [4,5].…”

Experimental Characterization of Shape of an Aggregate by a Numerical Value—Application to Senegalese Basaltic Aggregates for Rail Transport

“…The thickness of the ballast layer under the sleepers, between 150 mm and 400 mm, depends on the type of sleeper, the speed of the trains and the UIC group of the railway line. The ballast thickness on high-speed lines (LGV) is generally 30 cm under the sleepers [8].…”

Cartographie Géotechnique par Deep Learning Approche par Réseaux de Neurones Artificiels

“…Pour ce qui est des matériaux composant l'infrastructure elle-même, de nombreux travaux scientifiques ont été faits pour une maitrise plus ou moins parfaite de leur comportement mécanique. On en distingue deux : les granulats naturels issus de carrières d'extraction et les matériaux alternatifs tels que les mâchefers d'incinération de déchets non dangereux qui ont fait l'objet de publications récentes (Sow et al, 2017a(Sow et al, , 2017b(Sow et al, , 2018a(Sow et al, , 2018b(Sow et al, , 2018c(Sow et al, , 2018d(Sow et al, , 2018e, 2019a(Sow et al, , 2019b(Sow et al, , 2019c. Cependant, le comportement mécanique de l'infrastructure est en corrélation avec celui du ou des matériaux constituant le sol support.…”