What aspect of concrete does ASTM C1064 measure?

ASTM C1064 specifically pertains to the measurement of the temperature of freshly mixed concrete. This standard is essential because the temperature can significantly affect the properties of the concrete during the mixing, placing, and curing processes.

Monitoring the temperature is crucial for several reasons. It can influence the hydration rate of the cement, affect the setting time, and potentially impact the overall strength and durability of the concrete. Understanding and controlling the temperature of the concrete mix allows engineers and construction professionals to ensure the quality and performance of the concrete in various environmental conditions.

The other options focus on different properties or aspects. The strength of the concrete is typically evaluated through tests like ASTM C39, which measures compressive strength, while air content is determined using methods outlined in standards such as ASTM C231. Curing time, on the other hand, is monitored through various other methodologies that focus on the longevity of the curing process rather than the immediate measurement of freshly mixed concrete.