DIY cutting concrete expansion joints

Cutting expansion joints on a week old concrete slab using a circular saw with a diamond tippied blade. Saw rested on thin aluminium sheets. Gentle trickle of water from a hose to cool the blade. Air, from a compressor, to blow the water away from the line. The line was drawn with a chinagraph pencil (wax based). Chalk washed off. Cracks appeared in the slab a couple of days after being poured. Seems the expansion joints should be done the following day. The area was 60m² and quite thick. The joints were cut a week later in this video. Due to days of severe weather here we were unable to get the tools sooner. We're going to paint the concrete and use a special epoxy filler afterwards.

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