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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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