When the temperature is rising, the inner concrete’s temperature is higher than outer concrete’s temperature and the inner concrete is expanding.. what that will induce as a results of cracking.... ?
This difference in temperatures will cause the concrete to retract, which is its reduction of volume.
These cracks in the language of work resemble a map or crocodile skin.
In order to minimize cracks in surface desiccation, the surface of the element must be protected, after concreting, from solar radiation and wind action, and to begin curing immediately after the concrete is compacted
Dear Marcos de Oliveira Valin Jr .........Thanks for your answer..
Explain please what did you mean by " difference in temperatures "... what will happened if temperature raising ... or... when temperature drops ... does the concrete behave the same way...???
The attachement here might answer to your question, Your case might refer to the category "C". But i am sorry that i can find this only in French version.
Internal restraint arises from the gradient of temperature within a concrete member. During heating tensile stresses are induced in surface layers of the element and compressive stresses in the core the element (temperature increase is greater in the core than in the surface), thus, Cracks may form in the surface. During the cooling-to-ambient period an inversion of the stress body may occur. In such case the tensile stresses are observed in the core and compressive stresses in the surface, often resulting in cracks significantly reducing in width.
Cement has to react chemically, hence the curing is to be done and during curing period if you have not applied water properly, and when chemically reaction has not taken place fully by the cement, then there is problem of cracks formation.
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