Lightweight Concrete Applications

🧠 Concrete… that floats? When most people think of concrete, they think of one thing: heavy. But what if I told you concrete can float on water? Not theoretical. Not experimental. It’s been done! And continues to be used in everything from floating bridges to marine structures. The secret isn’t magic; it’s engineering the density. By carefully controlling: • Air void systems • Lightweight aggregates • Paste structure and connectivity …we can produce concrete with a density lower than water (~62.4 lb/ft³), allowing it to float while still maintaining structural performance. Even more interesting? These systems can be designed to be durable in some of the harshest environments on earth, freeze-thaw cycles, chlorides, and constant saturation. 🚧 This flips the script on how we think about concrete: It’s not just a heavy, rigid material… It’s a tunable, engineered system. And as materials science continues to evolve (colloidal silica, optimized pore structure, advanced admixtures), we’re only scratching the surface of what’s possible. 👉 The question isn’t what concrete is It’s what we’re willing to make it become. #Concrete #Engineering #ConstructionInnovation #MaterialsScience #DidYouKnow #Infrastructure #ConcreteTechnology

In construction, there are various ways to reduce the weight of concrete slabs. For instance, one approach involves leaving part of the space that would normally be occupied by concrete empty or filling it with a lighter material such as ceramic bricks or expanded polystyrene. Another approach, developed in the 1990s by Jorgen Bruenig in Denmark, is to use biaxial hollow slabs, which are now commonly known as BubbleDeck. This system is made up of hollow spheres made of plastic, which are inserted uniformly between upper and lower steel reinforcements. These spheres fill the space that would otherwise be occupied by concrete that serves little structural function and adds significant weight, such as the space between columns. By using this system, it is possible to reduce the weight of a slab by 25% to 35% compared to a solid slab of the same thickness. This reduction in weight allows for larger spans, reduces the section of the columns, and decreases the overload on the building's foundations. It is estimated that using 1 kg of plastic for the spheres can save about 100 kg of concrete

CO2 mineralisation for use in coastal seawalls "The project involving concrete waste is led by low-carbon concrete leader Pan-United. The waste is processed to become pebble-like aggregates, into which industrial carbon dioxide, or CO2, is injected and converted into a mineral. The CO2 used is captured and liquefied from emissions by manufacturing, chemical and petroleum companies. One tonne of the aggregates could sequester up to 100kg of CO2. The resulting novel concrete is 15 per cent lighter than the ordinary kind. “This tackles two problems at once, by upcycling waste and reducing carbon emissions,” said Pan-United’s chief executive Ken Loh. “Due to their lightweight property, the aggregates can be used to make lighter but strong concrete for coastal structures, like seawalls.” The lighter concrete could be a suitable material to top up existing coastal defences like shoreline slopes, raising the height without overloading the original structure. Pan-United is currently working with NTU to develop prototypes of its novel concrete. The next step will be to embark on a field trial." https://lnkd.in/gNfPjAWr