Basics

A Gravel Road made with Concrete Rubble, Clinkers, and Slag
It can be used as is, but most likely will be broken down to standard gravel dimentions
Possibly with a Hammermill or a Stamp Mill
Recycles waste products into usable low traffic roads and/or footpaths
May have some health concerns
May be useful to make Low Traffic Roads in a Disaster Relief effort
Can also be a use of waste from Cement Impregnated Canvas and Cement Impregnated Canvas Tents

Health Concerns

May need to screen waste used for various nasties such as:
Heavy metals etc: Cadmium, Lead...
Radioactive Stuff: Cesium etc (SHOULD be low levels if at all, but some waste, especially mining/refining waste can contain some of this, and the dusty enviroment of this type of road wwould lead to radioactive dust, which tends to be the real issue for most radioactive hazards (outside of HUGE instant exposures such as working during a full meltdown etc most radiation sources aren't THAT bad unless you are exposed to them long term, easy method to do this is to get radioactive dust in your lungs, or calcium seeking radioactive stuff in your digestive tract, and thus your bones, typically via water contamination) )

Screen Materials with a Radiation Sampler (A bit extra, but if even a simple giger counter is going off the charts, YOU HAVE an issue)
Basic Chemical Indicator Tests for Various Nasties (High School Level "What is/is in this sample / Test Strips + Kits)
If you have one, or are feeling fancy, use a X-Ray Florescence Analysis Device for a few samples