That kind of point loading on "green concrete" 7 day compressive strength must have been high, let alone at 4 days. 6 1/2 bag of Portland per cubic yard, wonder what PSI mix that would make. Amazing it did not fracture running on it that soon. I have put in structural slabs with 5000 PSI mix design and a nice grid of #4 bar at entrances to buildings where I knew we would be running across with heavy loads, often times part of a sidewalk, but just a section so we did not fracture the sidewalk where we crossed. Never fails on a site, sidewalk is put in too early or they forget and always has to be fixed, few extra yards and bar, good to go. Only difference I'd wait at least 2 weeks or the full month.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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