Many ancient Roman concrete structures persist to this day. The amazing strength and durability of many ancient Roman structures, especially those submerged in water, has amazed researchers. Many believe that it is the chemical reaction between seawater with a mixture of volcanic ash and quicklime that creates a highly resistant mineral known as aluminous toberormorite. Recently, a nuclear plant in Japan was decommissioned. Surprisingly, researchers found aluminous tobermorite in the w