Control of internal heat of hydration in large-scale concrete
Thread Content
A large concrete foundation is now to be poured, with a volume of around 2,000 cubic meters; how can the internal hydrothermal conditions be eliminated?
A layperson asks timidly: Why does \"internal hydrothermal activity\" occur during pouring?
I missed writing a word; it should be heat of hydration, the heat released during the hydration and condensation of concrete. Our company plans to use internal circulating cooling water pipes, but there is no theoretical basis for it; so how should the coiled tubes be arranged?
When concrete sets, heat is released. When its volume is small, the heat generated during hydration can still be dissipated, so the temperature difference between the interior and exterior is not very large； However, when the volume of monolithic concrete exceeds a certain level, it becomes difficult to release the heat of hydration generated by condensation within it. As a result, a temperature difference of up to 40–50 degrees can occur between the inside and outside of the concrete. Normally, a temperature difference of no more than 25 degrees Celsius is required to prevent shrinkage cracks caused by uneven expansion; therefore, measures need to be taken to reduce this temperature difference. We plan to use cooling circulating water coils inside the concrete to lower its temperature, but we lack a theoretical basis for doing so. I’m not sure if my description as a non-professional is clear enough; I truly hope experts can offer some guidance.