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Working with Unilock Tumbled Concrete Pavers

Bob meets with Brian Kallmeyer from Unilock to talk about the Unilock tumbled concrete pavers. The product starts out as a high density (minimum 8,500 PSI mix) concrete paver. The density is achieve by taking a pretty dry mix with good aggregates like local granite that's put in a 3-story machine that presses it to a very high compaction and compression. They use a standard portland - no more than a typical wet concrete. Originally to tumble the create the antiqued pavers, they would just throw the fresh, shiny, square pavers into an old cement mixer and roll it around. The process has since become more elaborate to meet the growing demand. The resulting product is easy to work with. Unlike the natural stone that it duplicates, these pavers have been made in a mold so they are very dimensionally stable. They can be cleanly cut using a lever action on a guillotine cutter. More information