I have to take issue with the last statement. Frost heaving occurs as a result of ice formation around small particles of soil causing an expansion in the mass. This can occur in any location provided the soil or substrate below does not readily accomodate this expansion due to large void spaces. Therefore, what is most important in the prevention of heaving due to frost is to provide a base material with sufficiently large size particles to accomodate the expansion of the frost susceptible soils. This is seen quite readily in Northern climates with frost heaving of roadways due to inadequate base preparation. Discontinuties in types of subgrade material and void ratios will also generate differential movement, not just a heated/unheated conditions.
To prevent heaving beneath utility pads on grade we usually either hire a geotechnical engineer to check the soil to see if it is frost susceptible, or excavate and replace with a granular, non-frost susceptible material of sufficient particle size (gravel, crushed stone)to a depth equal to the depth of frost dictated by local authorities. Turning down the edge of slab will not mitigate the movement unless the pad is designed to span and resist the uplift forces from frost.