The physical properties of epoxy compounds vary widely. Also, the epoxy grouts behave very differently than the sand-cement grouts. For example, the thermal expansion of an epoxy grout can be as much as 7 times the thermal expansion of sand-cement grout. It is therefore important that use of these grouts be based on experience and/or appropriate tests. Recommended tests and methods are given in Ref. PCI 20.
Epoxy grouts are mixtures of epoxy resins and a filler material, usually oven dried sand. These are used when high strength is desired, or when improved bonding to concrete is necessary. PCI Ref. 20 is a comprehensive report on the subject by Committee 503 of the American Concrete Institute.