This photo shows US SPEC R3 that was placed on a curb two years ago. Multiple tires have run over it, but it hasn't cracked or debonded.
R3 is used for a variety of concrete surface repairs, including curbs as shown in the photo. R3 is is easy to use and can be shaped to form once sufficient set is achieved. It provides outstanding resistance to the damaging effects of freeze/thaw cycles and delivers excellent compressive strength.