moving over a plurality of concrete placement locations at a job site at least one aerial drone, said at least one aerial drone having at least one sensor for monitoring the surfaces of the plurality of concrete placements for hydration over time of the placed concrete by scanning the topography of the placed concrete to obtain data signals indicative of hydration;

comparing the obtained data signals with previously stored data signals to obtain set time values or value ranges correlated with the hydration over time data obtained from the at least one sensor; and

generating a pictorial diagram or map of the plurality of concrete placement locations along with set time values or value ranges, or suggested sequence priorities based on set time values or value ranges, thereby to provide indication of placements that are amenable to sequential treatment with respect to (a) initiation of finishing; (b) completion of finishing; (c) removing formwork or mold from the concrete; (d) allowing foot traffic or car traffic on the concrete; (e) releasing tensioned cables from jacks; (f) anchoring or grouting post-tensioned cables; or (g) casting further concrete on top of previously poured concrete, and when said indication indicates that placements are amenable to said sequential treatment, initiating said finishing of said placements that are amenable to said sequential treatment.