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I'm not sure if sand paper and other coarse materials are a good way. Nowadays coated plywood is used as concrete formwork. The cement paste covers all aggregates and forms a smooth surface. If wood boards are used as formwork you likely see the wood grain but no aggregates. When you have defects in the concrete cover you might see single pieces of gravel. There are exceptions. Exposed-aggregate concrete is sometimes used for  architectural reasons. Steve's excample looks like sandblasted concrete, used for architectural reasons too. Regards, Volker (Germany)
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