Just my 2 cents worth : I agree the concrete should be kept moist to ensure proper curing, also if you can (especially on really hot days), have the mason wet the blocks before laying, again this will help the cement mortar from losing it's moisture as the block acts like a sponge.
When the mason gets his team to do the panette ( not sure of the spelling), or cement render, insist he wets the block in advance, ie. give the wall a good hose down BEFORE he commences, for the same reasons above. I spent some time explaining why the lap on the rebar was a necessity Dia x36 minimum, but had to keep reworking BEFORE placing the concrete, in the end I refused to allow the pours until I had signed off.
LAstly, if you can, buy your concrete from a batching plant, and if possible with temp control, ensure the aggregates are not without shade (they will get baking hot), but can also be problematic. I bought my concrete 3000psi from the capital for my pool base, and instructed the mix with fiberglass reinforcement to avoid shrinkage problems, the " batcher" forgot to send the 14 bags of fibre with the 1st truck, after an argument with the driver and the pump boom operator, they dispatched a car from SD to Bayaguana which arrived 3 hrs after the printed batch release time, so I refused the concrete, sent the 2nd without fibre, but the timing was such I could utilize the fibre for the 1st truck in the 2nd, and had a fresh 10 yds delivered within the placement time allowed, with fibre, in the end all was ok, but had I not have been present, the concrete would have gone in without any reinforcement at all. Best advice, as said in earlier posts, be there every day, 2-3 times a day and have hold instructions on the critical activity until you or your engineer / architect can review and approve. Hope this helps.