Ambient temperature, relative humidity and wind speed are all factors either on their own or in combination. The occurrence, direction and size can vary greatly depending on weather conditions at the time of placement. Premature drying or rapid drying results in surface tension build up, and this propagates as cracks at the surface. The primary cause of concrete cracking is either: Ready-mixed concrete producers have two standard answers to this problem: “we produce concrete with cement, aggregates, water and more often than not, admixtures, we do not have a feed bin for cracks” or “there were no cracks in the concrete when it came down our delivery chute”. Not so, the majority of surface cracks in concrete slabs are usually as a result of aftercare. Chances are if you are reading this then you are one of many concrete users or purchasers who unfortunately has experienced cracking.The initial response to cracking is that there must have been something wrong with the concrete when it was delivered.
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