aggregates and paste the aggregates are sand and gravel or crushed stone the paste is water and portland cement concrete gets stronger as it gets older according to a preferred embodiment of the present invention type x portland cement may be utilized portland cement is not a brand name but the generic term for the type of cement used in virtually all concrete cement comprises from 10 to 15 percent of the concrete mix by volume through a process called hydration the cement and water harden and bind the aggregates into a rocklike mass this hardening process continues for years meaning that concrete gets stronger as it gets older because of this it is desirable to use concrete rather than plastics or polymers according to a preferred embodiment non shrink grout is mixed with coloring agent and water and blended in a container using a mortar mixing blade attached to an electric drill until the desirable consistency is achieved typically the color of the composition will be yellow and will conform to federal color no 33538 of standard 595a this particular yellow color is close to that final color detectable by visually handicapped persons prior to going totally blind fig8 depicts scarification once the concrete mix is poured the bottom portion 350 may be scarified this may be automated or accomplished through the use of a scarifying tool 352 also numbers 354 may be scarified into the bottom portion 350 of the concrete so as to identify the proper tile for future reference to form a system of well aligned tiles for example where a multitude of tiles of different sizes need to be pre cast for future use such symbols may be utilized to identify the order in.