Production of mass concrete

Fresh concrete Limiting the temperature of the fresh concrete is a simple way of Maximum component temperature to be limited. In the case of massive components, a limitation to the following has proven to be effective in practice maximum 25°C proven. This has also found its way into specific sets of rules. A limit below this can also make technical sense. For example, the average annual ambient temperature or, in tunnel construction, the rock temperature is often used as a rule of thumb. Hardened concrete Die maximale Temperatur im Bauteilkern des vergossenen Betons, kann rechnerisch ermittelt werden und ist neben Faktoren wie Bauteildicke und Zementart im Wesentlichen von der Frischbetontemperatur abhängig. Die maximal erlaubte Betontemperatur gibt indirekt die Frischbetontemperatur vor. Um Spannungsrisse zu vermeiden geht man im Allgemeinen von einer maximalen Temperaturdifferenz von Bauteilkern zu Bauteilrand von 20K aus. Werden Dehnungen im Bauteil jedoch vollständig behindert, temperature differences of approx. 10K already lead to cracks in the concrete.

Especially at high outside temperatures, the required fresh concrete temperatures can only be achieved by appropriate cooling or heating measures. KTI is a specialist in this field and has Many years of experience for cooling and heating of mass concrete: Our recommended measures for maintaining fresh concrete temperature are:

• Protected storage of the aggregates to avoid freezing or heating up
• Active cooling or heating of the aggregates
• Cooling or heating the addition water
• Addition of plate ice or flake ice at high ambient temperatures
• Ensure short transport routes for the concrete
• Pipe internal cooling, so-called post-cooling, in the concrete component with cold water