AASHTO T 291-94 (2018) PDF Download

The AASHTO T 291-94 (2018) standard provides detailed guidelines for sampling and testing soil to determine its chloride ion content. The standard is divided into two parts. The first part outlines the procedures for sampling the soil and preparing the sample to the appropriate size for testing. This ensures accurate and representative results.

The second part of the standard describes two test procedures for determining the water-soluble chloride ion content in the soil. Method A follows the Mohr procedure, which involves using silver nitrate to determine the chloride ion concentration. Method B, on the other hand, utilizes a pH/mV Meter. This method involves comparing the millivolt (mV) readings from the meter to a calibration curve to determine the chloride ion content. Both methods provide reliable and accurate results for evaluating the chloride ion content in soil samples.