Efficiency can’t be achieved through an executive order. It must be proven. Through the lifespan of structures, their reliability, their speed of construction or a tangible reduction in consumption when in operation. Here are examples of three construction solutions capable of combining strength, efficiency of execution and reduced consumption PORTFOLIO HALVE THE CONSTRUCTION TIME _ With labor shortages, pressure to meet deadlines, and the increasing complexity of construction sites, performance also depends on how you build. These are the challenges addressed by off-site construction solutions, such as ONE PRECISION ASSEMBLIES (OPA), chosen for this housing project in New Hampshire (United States). The floors, walls, and roofs are manufactured in the factory and then assembled on site. This ensures reliable execution quality, limits material losses, and significantly reduces construction time, by around 30% to 50%. FILTER 96% OF THE SUN’S HEAT _ In hot climates, a building’s energy performance depends largely on the ability of its glazing to control solar heat gain. In India, where sunlight is plentiful and cooling costs are high, Google’s Ananta Campus in Bengaluru opted for active glazing incorporated into the building envelope design. The site is fitted with 19,000 m2 of SageGlass electrochromic glazing, making it the largest dynamic glazing installation in the world. Capable of automatically darkening depending on the light level, this glazing filters up to 96% of the sun’s heat, improves visual comfort, and contributes to a reduction of approximately 20% in the building’s energy consumption. BORING 200 KM OF METRO LINES AT GREAT DEPTH _ The Grand Paris Express is one of the largest transport projects in Europe. It creates a new automated metro network around Paris (France), with 200 kilometers of new track and 68 new stations, designed to eventually accommodate nearly 2 million passengers per day. An extraordinary project, carried out largely in a dense urban environment and at great depth. In this context, performance is particularly dependent on perfect mastery of concrete application in complex urban and geotechnical conditions. The project managers thus chose a concrete admixture developed by Chryso, Optima 1340. When incorporated into the batch, it helps maintain good concrete fluidity over extended periods, facilitating pouring at great depth while ensuring stability and final mechanical performance. This is essential when producing nearly 580,000 m³ of concrete without compromising on quality or safety on the construction site. Formidably efficient 79 78
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