Concrete mix does not require much water to achieve maximum strength. But a wide majority of concrete used in residential work has too much water added to the concrete on the job site. This water is added to make the concrete easier to install. This excess water also greatly reduces the strength of the Concrete Paving Blocks.Shrinkage is a main cause of cracking in Concrete Paving Blocks. As concrete hardens and dries it shrinks. This is due to the evaporation of excess mixing water. The wetter or soupier the concrete mix, the greater the shrinkage will be. Concrete slabs can shrink as much as 12 inch per 100 feet. This shrinkage causes forces in the concrete which literally pull the slab apart. Cracks are the end result of these forces.
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Virender Jindal (Sri Krishna Plasto)
Be-318 Hari Nagar New Delhi -110064, India
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