The chemical reaction, which causes concrete to go from the liquid or plastic state to a solid state, requires water. Reason #2 - Rapid Drying of the concrete Also, rapid drying of the slab will significantly increase the possibility of cracking. It is more expensive to do it right- it simply takes more manpower to pour stiffer mixes.
What you can do about it: Know the allowable water for the mix the contractor is pouring- or be very sure you have chosen a reputable contractor who will make sure the proper mix is poured. The bottom line is - and excess water reduces this ratio. Cracks are the end result of these forces.
This shrinkage causes forces in the concrete which literally pull the slab apart. The wetter or soupier the concrete mix, the greater the shrinkage will be.Ĭoncrete slabs can shrink as much as 1/2 inch per 100 feet. This is due to the evaporation of excess mixing water. As concrete hardens and dries it shrinks. This excess water also greatly reduces the strength of the concrete. This water is added to make the concrete easier to install. Reinforced concrete beam due.īut a wide majority of concrete used in residential work has too much water added to the concrete on the job site. Factors affecting drying shrinkage cracks and approximate methods for considering. Prediction of Cracking in Reinforced Concrete. Reason #1 - Excess water in the mix Concrete does not require much water to achieve maximum strength. Durable, high strength, and crack resistant concrete does not happen by accident. But it is important that concrete contractors follow well-established guidelines with respect to concrete placement. When installed properly, concrete is one of the most durable and long lasting products you can use around your home. The homeowner will question why it is cracking and did they receive a shoddy job. Why Concrete Cracks One of the most common questions received on ConcreteNetwork.Com is about cracks that are developing in newly poured concrete.
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