What kind of aggregate could we use to improve the wear resistance of a concrete floor that will be subject to truck traffic and to an accumulation of sand and other grit on its surface?
Hard aggregates commonly used are emery, granite, quartz, aluminum oxide, silica, trap rock and metallic aggregates. Metallic aggregates resist abrasion by virtue of their malleability, the others by their hardness. One method of using the aggregates is to trowel them into the surface. Another is to incorporate them in the topping mix. Further details are given in "Recommended Practice for Concrete Floor and Slab Construction," ACI 302.