AASHTO T 309-20 PDF Download

The AASHTO T 309-20 standard provides guidelines and procedures for measuring the temperature of freshly mixed Portland cement concrete. The purpose of this standard is to ensure accurate and uniform temperature measurements are taken in order to assess the workability and quality of the concrete mixture. This is important because the temperature of the concrete can greatly affect its setting time, strength development, and overall performance.

The standard outlines the equipment and materials needed for the temperature measurement, such as a calibrated thermometer or temperature probe, an insulated container for sample storage, and a method for protecting the sample from temperature fluctuations during transportation to the laboratory. It also specifies the proper sampling technique and sample handling procedures to prevent any temperature loss or gain.

The standard provides detailed instructions on how to measure the temperature of the freshly mixed concrete. It includes information on the location and depth of the temperature measurement, the frequency of measurements, and the required accuracy of the temperature readings. It also covers any special considerations or adjustments that may need to be made based on the ambient temperature, the type of cement used, or other specific project conditions.