1. Scope

Keywords

Rationale

A chloride test method does not exist for coarse-grained material. ASTM D512 Standard Test Methods for Chloride Ion in Water and AASHTO T291 Determining Water-Soluble Chloride Ion Content in Soil, are not applicable for coarse-grained material as it requires the material to be crushed to pass a No. 10 sieve (T291) to remove larger particles. It is not appropriate to crush the coarse-grained material so that it would pass the designated sieve as in doing so, the chloride is altered and would misrepresent the material being used in the field. This document includes modifications offered by Tex-620-M in NCHRP 21-11, Determining pH, Chloride and Sulfate Contents in Soils and follows similar changes approved in D8262, Determining the pH of Granular Materials, and proposed work order WK71902, Measuring Electrical Resistivity of Granular Material, concerning sampling procedures. A similar work order WK93648 addresses sulfate ion content in granular materials.