Have you seen wet clay soil where the water evaporates quickly and then makes the soil surface look like below?
Like in the clay soil, concrete also changes in volume after evaporation of water and makes cracks.
The process of volumetric change in concrete due to the evaporation of water content is known as the shrinkage of concrete. The shrinkage cracks start to appear on the surface due to the moisture evaporation without any external load.
As per the research, usually, the concrete slab can shrink as much as 12.7 mm per 100 feet.
A single most important influencing factor is water apart from the below,
This is the reason why we insisted on wet the shuttering area by water on-site to cool it.
Plastic Shrinkage – The plastic shrinkage will be happening in horizontal surfaces of the concrete after the
Drying Shrinkage – The drying shrinkage is a continual process and happens in hardened cement concrete surfaces due to the evaporation of water molecules at the final setting time of concrete.
Autogenous Shrinkage – The impact of autogenous shrinkage is very minimal because it happened on the concrete surface due to the non-movement of water molecules in concrete. It develops a minor magnitude of shrinkage in concrete.
Thermal Shrinkage – The thermal shrinkage occurs in concrete surfaces due to the high-temperature
Carbonation Shrinkage – Mostly carbonation shrinkage will happen at the mid-level temperature. The carbon dioxide makes chemical reactions with a water content of hydration cement concrete. Then the carbonation penetrates the concrete and develops cracks in the concrete surface.
Hope you enjoyed the article. Happy Learning 🙂
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