The Constructor

What is Concrete Temperature Limit?

Concrete Temperature limit

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Concrete Temperature limits are established to ensure that high quality concrete with specified requirements are produced. Various standards and specifications provide limits on temperature of concrete so as to achieve designated strength and durability. Concrete temperature limits changes based on the type of the elements and working conditions; hot or cold, windy or calm, dry or humid. This article highlights concrete temperature limits at different conditions based on different standards such as ACI Code, ASTM standards, and Australian Standard (AS).

Reasons to Set Concrete Temperature Limit

High initial temperature requires high water content to maintain required slump. High water content lead to lower strength, high permeability, greater shrinkage, lower air content at given air entraining admixture. If ambient temperature increase in combination with high initial temperature, then it reduces set time, higher early age strength, durability problem, thermal cracking in massive concrete structure.

Fig. 1: Concrete Temperature limit

Lastly, low initial temperature lead to intolerable setting time in cool weather, influence rate of strength achievement, and reduce ultimate strength up to 50% if fresh concrete is frozen.

Concrete Temperature Limits

Table 1 Minimum Concrete temperature limit during placement
Least dimensions of sections, cm Minimum temperature of concrete as placed and maintained during the protection period, °C
Less than 30.48 12.77
30.48 to less than 91.44 10
91.44 to less than 182.88 7.22
Greater than 182.88 4.44
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