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 (2-mm) sieve (T291) to remove larger particles. It is not appropriate to crush the coarse-grained material so that it passes the designated sieve, as doing so would alter the chloride content and 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. It follows changes approved in D8262, Determining the pH of Granular Materials, and the 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.