Hairline cracks in concrete shed base

[Roof_problems]

Hi
I’m looking for some advice on dealing with hairline cracks in a concrete base that I mixed myself. It’s laid on compacted MOT and the concrete is between 100mm and 120mm deep. The slab measures 3300 x 3600. It seemed to be going really well until a few hours into curing when I noticed several hairline cracks appearing as per the photos. Ultimately it only needs to support a wooden shed (2500 x 3000) so I’m hoping these don’t pose too much of an issue. Any advice on what I should / shouldn’t do with them would be appreciated e.g. should I be filling them and if so, with what?
Many thanks

 

[blup]

My guess is it dried too quickly in the heat we’ve had.

 

[Dereekoo]

Do nothing, that slab is going nowhere and no doubt dust and muck will fill them in over time

 

[Munroast]

it is probably only a few mm deep - shrinkage crack top is drying out much quicker than the middle and bottom
when did you lay it ? keep the surface wet for a few weeks

don't worry, I don't think you will wake one morning to find it has snapped in half