HYDROCRETE is established on Dual-AC Technology providing a unique crystalline waterproof concrete admixture, which also incorporates a hydrophobic pore-blocking component to provide the ultimate waterproofing admixture. Initially the pore-blocking component reduces the water absorption in the matrix. The next phase of action commences upon contact with water and produces nano-scale crystals which are formed in the micro-capillaries. These crystals remain active for the lifetime of the structure. It is supplied in powder form, in pre-weighed water-soluble bags, suitable for addition to the concrete at the batching plant.