1.1 These test methods determine the water soluble sulfate content of cohesive soils by using the turbidmetric/colorimetric technique. Two test methods are presented in this standard. Method A is for use in the field and Method B is for use in the laboratory. The turbidimetric/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. 1.2 The field method, Method A, is used as a screening test for the presence of sulfates and their concentration. The laboratory method, Method B, provides better resolution than the field method. 1.3 Ion chromatography is also an acceptable alternative method that can be used to evaluate results; however, it is outside the scope of these test methods. 1.4 These test methods are partially based on the Texas Department of Transportation test method, TEX-145-E. 1.5 Units-The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 unless superseded by these test methods. 1.6.1 The procedures used to specify how data are collected/recorded and calculated in these test methods are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the users objectives; it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering data. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywordscolorimetric; clay; ettringite; stabilization; thaumasite; turbidmetric; water soluble sulfates
There is no current ASTM standard that can be used nationally and internationally. Currently, only state governments have test methods and, while they are similar in some respects, they are also different as well. Creating an ASTM standard will allow for more consistent methods to be used by many users across state and national lines. Specifiers will be able to cite a nationally/internationally recognized test method that has been approved via consensus.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development