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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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