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In this article, we explore the various factors affecting the quality of welded joints, from edge preparation to the management of thermal and metallurgical stresses. Critical issues such as cold cracking, hot cracking, lamellar tearing, and fatigue failures are discussed, along with practical recommendations to enhance weld durability.
This article addresses the structural design according to the Eurocodes, a set of European standards governing the design and sizing of construction works. It examines the specifics of the Eurocodes applicable to various materials and scenarios: concrete (Eurocode 2), steel (Eurocode 3), timber (Eurocode 5), masonry (Eurocode 6), foundations (Eurocode 7), and seismic actions (Eurocode 8). The fundamental principles, calculation and verification criteria, as well as considerations for fire resistance and material-specific constraints, are detailed. The objective is to ensure the safety, durability, and performance of structures.
This article provides an in-depth analysis of lightweight aggregates, essential materials in the design of modern structures that combine performance, lightness, and energy efficiency. It explores a wide range of materials, from mineral products such as expanded clay and perlite to plant-based and synthetic solutions like wood aggregates, expanded polystyrene, and expanded glass. The article highlights the technical characteristics, manufacturing methods, and varied applications of these aggregates in the construction industry. Due to their thermal and acoustic insulation properties, as well as their contribution to reducing the weight of structures, these materials meet the growing demands for sustainability and compliance with environmental standards.
This article addresses the construction systems for straw bale buildings, highlighting their characteristics, advantages, and implementation methods. It explores the main systems used, such as timber framing, prefabricated panels, and peripheral systems to the structure, and examines the criteria for selection based on the nature of the building, structural constraints, architectural expression, and the types of interior and exterior finishes desired.Straw bale constructions offer an ecological and high-performance alternative in terms of thermal and acoustic insulation while meeting regulatory standards. However, they require precise design and sizing of the structures to ensure the building's stability and durability.
Corrosion is a physico-chemical reaction between a metallic material and its environment. It leads to a loss of material, and also has a major social, economic and environmental impact. The application of protective measures provides solutions to delay this phenomenon. Steel products can undergo surface treatments, organic or metallic coatings, electroplating, galvanisation, and even transformation of the metal surface. The effectiveness of the treatment depends to a large extent on the preparation of the substrate. The implementation of preventive measures from the design phase is the most effective. This article deals with the phenomenon of corrosion, its causes, protective measures and its environmental impact.
This article discusses stainless steels, known as austenitic-ferritic. Discovered in the 1930s, they are biphasic alloys with a 50% α (ferrite) and 50% γ (austenite) structure, obtained through a specific chemical composition including carbon, chromium, and nickel. They are produced in an electric furnace followed by a refining process, ensuring the reproducibility of chemical compositions. These steels have mechanical characteristics superior to austenitic stainless steels, particularly in tensile strength and yield strength. They are suitable for the chemical industry due to their resistance to corrosion and abrasion, especially within a temperature operating range between -50°C and +300°C.
This article meticulously outlines the varieties of cast iron, their manufacturing processes, micrographic structures, and applications. White cast irons, achieved through rapid cooling and specific manganese and silicon content, are characterized by high hardness, used in wear-resistant applications after thermal stabilization. Gray cast irons, with carbon in the form of graphite, have complex structures and diverse applications, notably in mechanical construction and chemical engineering. Malleable cast irons, enhanced through specific heat treatments, are designed to optimize their malleability.
The article delves into the various aspects of fire resistance in steel and mixed (steel-concrete) structures. It emphasizes that steel's performance deteriorates under the influence of heat and that several factors such as the duration of fire exposure and applied loads influence this performance. Solutions for enhancing fire resistance are also discussed, including the use of insulating barriers and intumescent paints. The article covers standards and calculation methods, notably Eurocodes 3 and 4 and the ISO-834 standard, and suggests modern methods like numerical simulations for assessing fire resistance.
This article will list a set of recommendations, both technical, experiential, but also aesthetic, even cultural, necessary for the (re)valorization of earthen architecture that is simultaneously modern and traditional.
This article focuses on iron-carbon alloys, such as steels and cast irons, and their significance in the field of metallurgy. The iron-carbon diagram is presented as an essential tool for understanding the various phase transformations of alloys based on temperature and carbon content. Steels are ferrous alloys suitable for hot shaping, while cast irons are characterized by eutectic solidification. The constituent phases of steels, such as ferrite, cementite, and perlite, are discussed in detail, along with their impact on the mechanical properties of steels. The size of the ferritic grain is also addressed, including factors influencing its formation.
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