1.1 These methods determine the water soluble sulfate content of cohesive soils by using the colorimetric technique. Two methods are presented in this standard. Method A is for use in the field and Method B is for use in the laboratory. The colorimetric technique involves measuring the scattering of a light beam through a solution that contains suspended particulate matter. Measurements of sulfate concentrations in soils can be used to guide professionals in the selection of appropriate stabilization methods.
Colorimetric; clay; ettringite; stabilization; sulfates; thaumasite; water soluble sulfates
There is currently no ASTM method for the rapid determination of water soluble sulfates in construction soils. Sulfate reactions may cause deterioration in concrete structures. In addition, expansive reactions may occur in clay soils when sulfates combine with calcium based reagents added to stabilize the soils. The subcommittee has been encouraged by geotechnical consultants and a government agency to develop an ASTM standard that details test methods to identify the presence of water soluble sulfates in soils.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: D18.06
Staff Manager: Katerina Koperna
Date Initiated: 01-08-2022
Technical Contact: Kendra Adams
Ballot: D18.06 (22-02)
Status: Negative Votes Need Resolution
Ballot: D18 (22-01)
Status: Will Reballot Item