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Hardened properties of 3D printable mortars with full replacement of natural sand by recycled sand
No full textInternational audienceUsing recycled aggregates in concrete and mortar reduces environmental impact by minimizingboth natural aggregate consumption and construction waste disposal. 3D printing offers innovative, costefficient construction methods, but it heavily relies on cement and sand. This research aims to investigate the hard properties of 3D printing mortars made with 100% substitution of natural sand by recycled sand. The effects of sand substitution and 3D printingprocess on the hard properties of printable mortars are studied. The mechanical strength of moulded and printed specimens of printable mortars based on recycled sand were studied and compared with those made from a reference printable mortar based on natural sand. Additionally, the microstructure of mortars, namely the density of the interfacial transition zonein these specimens was analysed to understand the mechanical strength results. The results showed that both the incorporation of recycled sand and the 3D printing process had little effect on the mechanical strength. This could be attributed to the decrease in the density of the interfacial transition zone caused by both the incorporation of recycled sand and the mortarprinting process. Furthermore, the study investigated also the effect of incorporating recycled sand on autogenous, drying, and total shrinkage. It was observed that this incorporation reduces the autogenous shrinkage at an early age, while it increases both dry and total shrinkage
Tackling the indoor exposure to H2S emissions from Sargassum seaweeds stranding by an operational assessment of dwelling ventilation strategy
No full textInternational audienc
Review of level-set reinitialization methods in computational mechanics and materials science
No full textInternational audienceThe level-set (LS) method has been widely spread since its introduction in 1988. One of its main features is that interfaces are represented through signed distance functions, and the distance property eases the smoothing of discontinuities across an interface, and the computation of normal vectors and mean curvatures. This property can be lost whenever the LS function is evolved, for instance, through an LS transport equation. Numerous studies proposing so-called LS reinitialization methods to restore the distance property have been published since 1988. This paper is a review of numerical developments on LS reinitialization in the past decade (2014-2024). LS reinitialization methods are classified into three categories: direct methods which geometrically compute distances, local indirect methods which solve the Eikonal equation point-by-point, and global indirect methods which solve the Eikonal equation for all points at once. The review focuses on numerical methods and investigates the following questions. Can it be implemented in a parallel computing environment with nearly optimal scalability? Can it be used with any approximation method, and is it compatible with unstructured grids? Can it be extended to reach higher-order convergence rates? Can it be combined with mass change error attenuation techniques? Does it involve any numerical parameters that may affect its robustness? Is it limited only to some applications? Through a quantitative and qualitative analysis of the past decade's literature, this review paper proposes novel insights on LS reinitialization. Research on direct methods should focus on parallel efficiency and robust higher-order distance computation techniques. More attention should be given to local indirect methods, especially regarding parallel and higher-order algorithms for unstructured grids. Control parameters for global indirect methods should be better determined or eliminated. More research is needed on the issue of blind spots in two-phase problems involving moving contact lines and their elimination
Advanced Composites Manufacturing and Plastics Processing
No full textInternational audienceThis reprint focuses on the latest scientific development of advanced composites manufacturing and plastics processing. It contains research articles addressing new process developments, modeling/simulation, monitoring/control, and performance or application issues, with either experimental or numerical approaches. All types of polymers (thermoplastics or thermosets) and fibers/fillers (glass, carbon, ceramic, mineral, vegetal …) are concerned, whether they come from recycled, bio-based, or fossil feedstocks. The contributions are clustered in three fields: (i) advanced composites manufacturing (coupling/hybridization of processes; automated fiber, yarn or tape placement and additive manufacturing; long fiber thermoplastics compounding; fibers and fabrics production; manufacturing of sustainable bio-based composites; laminated glass/polymer composites), (ii) machining, milling and drilling of polymers, composites and multi-materials laminates, and (iii) polymer processing and compounding (functionalization; plastics recycling)
Fracture-induced variations in mechanical properties of silty mudstone under triaxial stress
No full textInternational audienc
Impact of deposition model on particulate fouling of heat exchanger
No full textInternational audienceParticulate fouling of heat exchanger is predicted using a multiphase Eulerian-Lagrangian Large-Eddy Simulations (LES) coupled to a Lagrangian Particle Tracking (LPT), which solves the particle equation of motion under the point force approximation. The effect of deposition model on overall particulate fouling is computed by tracking solid and spherical particles in a bi-periodic fin-tube geometry. In this present study, two deposition models the Trap Wall Model (TWM) and the Critical Deposition Velocity Model (CDVM) are compared and discussed
An international dataset on organic molecule concentrations in soil and related kitchen garden crops
No full textInternational audienceKitchen garden crops offer many environmental, socio-economic and health benefits but can also result in land use changes that may increase citizens’ exposure to pollutants. In this context, a dataset of organic molecules, based on an analysis of scientific literature was created, entitled BAPPOP (BAse de données sur la contamination des Plantes Potagères par les molécules Organiques Polluantes, i.e. dataset on contamination of kitchen garden plants by organic pollutants). BAPPOP compiles 6246 entries collected from 87 publications and 3 reports linking data on organic molecule’ concentrations in kitchen garden soil and crops. Additional information relative to the conditions for which the data have been obtained complete the dataset: organic molecule descriptions, soil properties, plant descriptions and treatments, experimental and analytical methods, as well as bibliographic information. This dataset is suitable for various stakeholders involved in environmental analyses both to compare site specific results to scientific literature data and secondly to predictively evaluate organic molecule’ concentrations and their transfer to kitchen garden crops based on the soil concentration
A nonlinear viscoelastic-plastic creep model for silty mudstone considering critical damage state
No full textInternational audienc
Predicting viscoelastic behavior and crack propagation in EPDM rubber under long-term thermal aging
No full textInternational audienc
Corrigendum to ‘Application of Ventilated Solar Façades to enhance the energy efficiency of buildings: A comprehensive review’ Energy Rep. 13 (June) (2025) 1266–1292/2352–4847
No full textInternational audienceEnhancing building energy performance, driven by growing concerns about energy conservation and sustainable development, is renewing interest in passive solar systems. Among the various passive technologies, the strategic development of ventilated solar façade has received increasing attention from engineers and architects in recent years. Depending on their configurations and associated design principles, ventilated solar façade haveproven to reduce heating and cooling loads by harnessing solar energy. This article provides a comprehensive review of the state-of-the-art research on passive ventilated solar façade and their integration into building envelopes, focusing on their respective enhancements in terms of energy efficiency and limiting the use of conventional space heating and cooling methods. The different works are divided into four categories based on air circulation techniques. This study is intended to be a valuable resource for academic researchers and a source of inspiration for architects and engineering designers in the development of façade and thermal systems