1350.05.04.02 Plastic…

1350.05.04.02 Plastic Concrete Requirements

• The specified concrete temperature limits are more restrictive than those in CSA A23.1 Table 14
  Permissible concrete temperatures at placing
• The reduced upper temperature limits (25 °C and 28 °C) do not account for the use of modern admixtures and mix designs that can maintain performance at higher temperatures.
• These prescriptive limits may result in unnecessary rejection of compliant concrete that meets CSA requirements for strength, durability, and workability.
• The requirement does not consider practical construction conditions, including ambient temperatures, haul times, and placement methods, which are addressed within CSA provisions.
• Imposing stricter temperature limits may increase project costs, scheduling challenges, and potential material waste without demonstrated performance benefit.
• As this is a design-build standard, CSA A23.1 should govern material and performance requirements, allowing flexibility in achieving compliance.
• It is recommended that temperature requirements align with CSA A23.1 and be based on performance criteria rather than fixed prescriptive limits.