When mixed with water and applied as a cementitious coating, the active chemicals in Xypex cause a catalytic reaction which generates a non-soluble crystalline formation of dendritic fibers within the pores and capillary tracts of concrete. This process permanently seals the concrete against the penetration of water or liquids from any direction.
The process by which Xypex waterproofs concrete is unique, in that Xypex is a catalyst. This crystalline growth is highly resistant to extreme water pressure from either side of the concrete and also to most aggressive chemicals. Since the process is catalytic, the crystalline structure can reactivate many years after the original application, to seal or re-seal many defects which might occur in the concrete at a later time.
The crystallization process that Xypex causes within the pores and capillary tracts of concrete is illustrated below in electron microscope photos taken by an independent research team.
|1. Concrete (untreated)
A control sample of concrete was sheared through at 50mm below the top surface. The sheared face shows some of the by-products of cement hydration with which Xypex reacts. Precipitated calcium hydroxide together with cubic and rhombic particles are visible.
|2. Xypex crystallization (initiation)
Taken at 50mm within a Xypex-treated concrete sample, This photograph shows the initiation of the Xypex crystalline reaction after Xypex Concentrate was applied to the surface.
|3. Xypex crystallization (mature)
This photo was taken 26 days after the application of Xypex Concentrate at a depth of 50mm into the concrete sample. A dense, fully developed crystalline structure has formed within the capillary tracts of the concrete to completely block the flow of water.