Most dispatchers are fairly handy and may recommend the best blend. For a big slab like ours which will have occasional car or truck targeted traffic, we ordered a 3,500-lb. mix with five percent air entrainment. The air entrainment traps microscopic bubbles that assist concrete stand up to freezing temperatures. https://fernandojrair.digiblogbox.com/61516570/engineered-concrete-specialists-delivering-durable-results-across-new-zealand