Worked for a concrete company for 20 years. Amount of cement in mix and water do determine the strength as most mixes are designed for a 4" slump maximum.Also strength of aggregate is a big factor concrete cannot be stronger than the gravel thats in the mix.Also a whole list of chemicals can be added to affect strength. How the Hydration takes place also affects final strength the more water that stays in the concrete for the cement to hydrate with the stronger it will be.A hot windy day can dry out the top of a slab and weaken it causing problems.Also its common for finishers to poke holes in the plastic thats under the slab to decrease set time this also weakens the concrete by draining the water off defeats the whole reason for having the plastic there in the first place which is to keep the moisture in the slab.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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