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In this article, we explore the evolution of formwork in the construction industry, highlighting technological advances that have transformed its design and use. From traditional wooden formwork to metal and synthetic models, each innovation aims to enhance cost-effectiveness, safety, and the quality of concrete structures. We examine modern solutions such as climbing and sliding formwork, as well as process optimizations to ensure watertight, stable, and reusable formwork. Finally, we address the environmental impact and best practices to reduce material waste.
The article discusses various drilling methods used in civil engineering, notably rotation and rotary-percussion, tailored to the nature of the terrain and drilling objectives. It details the components of the drilling string, such as standard rods and heavy rods, as well as drilling tools like tricone bits and roller bits, classified according to the IADC code. The article also covers the ODEX method for simultaneous drilling and casing in unstable terrains, as well as air reverse circulation for efficient sampling. Drilling parameters, the importance of drilling muds, and rotary coring techniques are also discussed, highlighting the evolution of coring methods and tools to optimize performance and reduce costs.
The article explores the different techniques and developments of retaining walls used to stabilize terrain. Historically based on mass to ensure stability, retaining walls have evolved significantly with the invention of reinforced concrete and Reinforced Earth® systems. It outlines various types of walls, such as gravity walls, reinforced concrete walls, and gabion walls, each with advantages and constraints depending on terrain and geotechnical conditions. Preliminary soil studies are essential to ensure the stability of these structures. Drainage and foundation quality also play a crucial role in the durability and safety of the walls. The article emphasizes the importance of geological surveys and rigorous checks to prevent instability.
This article discusses earth pressure at rest and the active and passive states in soil-structure interactions for retaining walls. It explains the relationship between horizontal and vertical stresses through the coefficient of earth pressure at rest and how soil displacement affects the mobilization of active and passive pressures. Calculation methods such as Coulomb, Rankine, and Boussinesq are addressed, considering soil-wall friction and complex mechanical interactions. The article also highlights the use of Mohr's circles to visualize soil stress states and the application of Kérisel and Absi's tables to accurately determine active and passive earth pressure coefficients.
This article addresses the fundamental differences and characteristics of rocks and soils in civil engineering geology. It highlights the complexity of rocks, which, despite their solid appearance, may have internal faults and fissures. Soils are described as dynamic entities composed of various elements, influencing key properties such as porosity and permeability. The article emphasizes the importance of technological advancements in understanding soil properties for the design and construction of secure structures. The distinction between in-situ and imported soils is crucial for foundation selection, with special attention given to the challenges of recent terrains.
This article delves into the identification of key requirements and performances in the construction sector, placing a particular emphasis on the concept of performance within the framework of building engineering. It highlights how the performance of a construction product is defined, discusses the notion of performance-based specification, and details the classification of performances into various areas and categories. A portion of the article is dedicated to the evaluation and certification of these performances. Additionally, the article tackles extra performance classifications, particularly acoustic classifications and the fire resistance of materials.
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