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 - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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