I hauled ready-mix concrete for two years. Lot's of Federal DOT pours too. Overpasses & bridges, every load gets materials tested for moisture, weights via certified scales confirmed, and the materials dumped in the mixers, driver has to reset his drum turn counter in front of the inspector, the inspector at the pour logs the turns, can't be too few or too many, most of our pours were close to 20 miles away, the drums barely turned, think the range was 60 to 90 turns. You tested slump, fill a traffic cone, invert and remove cone, measure height of concrete, had to be something like 75% original height. Then pour test bar, 4x4 or 6x6 by 24 to 30 inch long, smooth all 4 sides, ID numbers scratched in bar. And then you unloaded. One yard bucket hanging on a 50 ft crane boom, crane operator dropped the bucket within less than an inch all 7 buckets., next truck was ready to unload by the time I was empty. We had a wet batch of sand one day, SEVEN loads, 49 total yards dumped off the back edge of the parking lot at the truckstop, All 7 loads in transit to the pour before the first load failed slump. Would have made a great driveway or livestock feed floor. Our new REX batch plant was computer controlled, all materials weighed into hoppers then fed into a really big mixing drum, very little chance of a mistake, only rain water-logged material could cause it. Now, the jobs pouring basement walls, driveways, sidewalks, floors for buildings, feed floors, etc, you pulled away from where you unloaded, somebody on the contracting company told you where you could wash out, you cleaned your chutes, back of the truck, any tools the contractor wanted cleaned, and I always left a couple gallons of water in the drum, and hurried back for another load. If you got more than a handful of Sand & gravel out of an empty drum you really weren't empty. Lot of contractors that poured walls, they would have you back up to the wall, tell you to Add 50 gallon! and they haven't even seen the mix yet. The last load they poured probably took 50 gal. Our trucks only had 100 gallon water tanks. The little bit of sand and gravel that comes out of an empty ready-mix truck is worthless, If I washed out on a crushed rock driveway in a week it would be impossible to see any sign I had been there. Back when I hauled summer of '75 & '76, and a week in July '77, concrete was $50-$55/yard. There were discounts for some contractors, they emptied trucks faster, poured more big jobs. For instance, me and another driver hauled over 120 yards combined in one morning, only a mile from our one small batch plant, we left our chutes at the job site. We dry batched from that plant, had to really spin the drum on that short drive to the job! Was a fun job! I referred to the truck as a Mobile MUDHOLE I wore rubber boots every day.
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