Tridilosa

Tridilosa is a very light, strong and materials-efficient three-dimensional structure made of steel and concrete and widely used in civil engineering. It was invented by the Mexican engineer Heberto Castillo. Its notable feature is that it can save up to 66 percent of the concrete and up to 40 percent of the steel of a conventional slab, because concrete is needed only in the upper compression zone and not in the tension zone. It is so light that it can float on water, yet it is three times stronger than traditional construction flagstone. It was used, for example, to build the 54-floor World Trade Center of the Worldwide World Trade Centers Association in Mexico City.