@mrbarricade: Here in Jamaica, people sometimes talk about using coral in concrete because it is local and rich in calcium. Concrete works by combining cement + water + aggregate to carry compression, then adding rebar so it can handle tension. In theory, broken coral can act like aggregate and help the mix set, and using nearby material can cut hauling costs and speed up small island projects. But there is important context to know. Why some consider coral • It is locally available on many islands, so hauling rock from far away is reduced. • The calcium carbonate in coral can participate in cement chemistry and very porous coral particles can hold water, which can aid curing in some mixes. Serious drawbacks you should not ignore • Durability. Coral particles are weak and very porous, so concrete made with them can be less strong and more permeable. That lets chlorides move in faster, which can corrode rebar and shorten service life, especially in salty, coastal air. • Salt contamination. Coral and beach-derived materials often carry salts that accelerate steel corrosion unless specially treated or paired with non-metal reinforcement. • Environmental impact and legality. Harvesting coral from reefs is damaging and often illegal. Jamaica and many Caribbean nations protect reefs due to massive historical losses and active restoration efforts. Better island-friendly approaches • In Jamaica the standard, sustainable path is crushed limestone from land quarries and regulated river sand, not coral from reefs. These sources are abundant and widely used for construction. • If you face extreme supply constraints, engineers can combine local limestone, manufactured sand, and supplementary cementitious materials like pozzolans or slag to reduce cement and improve durability. • For marine environments, use coated or stainless steel rebar or FRP reinforcement, robust mix designs, and good cover to resist chlorides. Research shows coated steel performs better in coral-aggregate concretes, but the ethical and legal sourcing of the aggregate still matters. Bottom line This video from Jamaica is a learning moment. Coral may look like a handy substitute for rock, but reef ecosystems are priceless and protected, and coral-aggregate concrete has real durability risks. The modern best practice is to protect reefs, build with land-sourced limestone and regulated sands, and design mixes that last in salty climates. That is how island construction can stay strong, safe, and sustainable. #MrBarricade #SustainableConstruction #Concrete #Jamaica #CivilEngineering

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Saturday 06 September 2025 15:18:23 GMT