Natural Stone Coating, a.k.a. Polymer Modified Cement is a substantially strong and durable thin mostly decorative layer that is implied over a concrete surface. This product has been around for several decades, but its application for such factors is relatively new. Polymer modified cement is fabricated by partly substituting the cement hydrate binders of traditional cement with polymers. Natural stone coating has a monolithic matrix comprising of the cement gel matrix and homogenized polymer matrix. Post mixing with water, the particles of the cement past begin to hydrate and the cement gel slowly builds on the surface of the cement particles. The non-hydrated cement particles treated with cement gel is being enclosed with a tightly packed layer of introduced polymer particles. The water is then removed by cement hydration and evaporation, and the tightly packed polymer particles, placed on the cement hydrates, incorporates into constant membranes. These membranes adheres the cement hydrates together to construct a monolithic network. Polymer modified cement could possibly have less degree of permeability or a higher density than unadulterated Portland cement, however it is vital and depends on Portland cement binder for its structural integrity. Portland cement is an alkaline material which reacts with acids, negating the acid and side-by-side destroying the concrete matrix. According to a study done on the natural stone coating market, in certain cases the polymer is used in addition to Portland cement in order to form Polymer Modified Concrete (PMC) or Polymer Cement Concrete (PCC), also polymers in concrete have been superintended by Committee 548 of the American Concrete Institute ever since 1971.
Properties of Natural Stone Coating:
The membranes or polymer films formed in the structure of natural stone coating generate the sealing effect, which renders a considerable raise in tightness and proofness of the water, moisture transmission, resistance to chloride ion penetration, oxygen diffusion and carbonation. This effect is also enhanced with escalated polymer-cement ratio. This binding property of polymer modified cement enables rectification of both polymer and traditional cement-based concretes. A few main properties are listed below: