ASTM D8459-23 PDF
Standard Test Methods for Detecting Water Soluble Sulfates in Construction Soils
Standard Test Methods for Detecting Water Soluble Sulfates in Construction Soils
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 9
- Дата публикации:
- 15 февраля 2023 г.
- Издание:
- D8459
- ICS:
- 13.080.10
SIGNIFICANCE AND USE 5.1 Where sulfates are suspected, subgrade soils should be tested as an integral part of a geotechnical evaluation because the possibility that sulfate induced heave may occur if calcium containing stabilizers are used to improve the soils and sulfate reactions may also cause deterioration in concrete structures. When planning to treat a soil used in construction with lime, testing the soil for water soluble sulfates prior to treatment becomes very important (Note 2). 5.2 When sulfate containing cohesive soils are treated with calcium-based stabilizers for foundation improvements, sulfates and free alumina in natural soils react with calcium and free hydroxide to form crystalline minerals, such as ettringite and thaumasite.4 Thaumasite forms when ettringite undergoes changes in the presence of carbonates at low temperatures.5 The sulfate minerals expand considerably when they are hydrated. Note 2: For more information on the effect of treating soils containing water soluble sulfates, refer to the following publication: Little, D.N., Stabilization of Pavement Subgrades and Base Course with Lime, Kendal/Hunt Publishing Co., Dubuque, IA, 1995. Note 3: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors. SCOPE 1.1 These methods determine the water soluble sulfate content of cohesive soils used in construction 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 construction soils can be used to guide professionals in the selection of appropriate stabilization methods and to assist in assessment of potential deterioration in concrete structures. Note 1: These test methods are partially based on the research conducted by Texas A & M University. 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 this standard. 1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this test method. 1.5.1 The procedures used to specify how data are collected/recorded and calculated in the standard 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 user’s objectives; and 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. 1.6 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 appropri...
Abstract
Overview
ASTM D8459-23: Standard Test Methods for Detecting Water Soluble Sulfates in Construction Soils provides field and laboratory procedures for measuring water soluble sulfate content in cohesive soils used in construction. Published by ASTM International, this standard is vital for geotechnical evaluations because sulfates in subgrade soils can cause expansive reactions when calcium-based soil stabilizers like lime or cement are used. Such reactions may result in soil heave or deterioration of concrete, leading to costly damage. ASTM D8459-23 is recognized internationally and aligns with WTO principles for standardization.
Key Topics
- Purpose of Sulfate Detection: Identifies sulfate concentrations in soils to prevent chemical reactions with stabilizers that can compromise foundation integrity and concrete durability.
- Test Methods:
- Method A (Field): A rapid colorimetric screening for sulfate presence and concentration.
- Method B (Laboratory): A detailed colorimetric analysis providing higher resolution measurements.
- Colorimetric Technique: Measures the scattering of light through a solution containing suspended soil particulates; uses reagent-grade barium chloride to react with sulfates and quantifies results via a calibrated colorimeter.
- Significance: Essential for soil stabilization projects using lime or other calcium-rich additives, as improper management of sulfate-rich soils can lead to formation of expansive minerals like ettringite and thaumasite.
- Sampling Requirements: Ensures representative soil samples and proper handling per ASTM practices for reliable test results.
- Reporting & Documentation: Requires detailed record-keeping including soil identification, sample handling, equipment used, and calibration details.
Applications
ASTM D8459-23 is applied in numerous civil engineering and construction contexts where accurate identification of water soluble sulfates in soils is critical:
- Subgrade Stabilization Projects: Assessing sulfate content prior to lime, cement, or calcium-based treatments helps avoid damaging soil expansion and structural issues.
- Road and Pavement Construction: Protects against sulfate-induced heave that can compromise surface smoothness and longevity.
- Concrete Foundation Design: Informs selection of materials and techniques to mitigate deteriorative reactions between ground sulfate and structural elements.
- Geotechnical Site Investigations: Integral part of pre-construction site assessments for infrastructure and building projects.
- Remediation and Quality Control: Used by agencies and consultants to monitor sulfate levels during soil improvement and site development, ensuring compliance with project specifications.
Related Standards
ASTM D8459-23 references and aligns with several key ASTM and industry standards relevant to geotechnical testing and soil analysis:
- ASTM D653: Standard Terminology Relating to Soil, Rock, and Contained Fluids
- ASTM D1193: Specification for Reagent Water
- ASTM D2487: Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
- ASTM D2488: Practice for Description and Identification of Soils (Visual-Manual Procedures)
- ASTM D3740: Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
- ASTM D4753: Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction Materials Testing
- ASTM D6026: Practice for Using Significant Digits and Data Records in Geotechnical Data
Practical Value
By following ASTM D8459-23, engineers, soil testing agencies, and construction professionals can:
- Mitigate risks of structural damage and unexpected maintenance related to sulfate reaction.
- Select appropriate stabilization treatments tailored to site-specific sulfates content.
- Ensure compliance with industry best practices and contractual specifications.
- Optimize long-term performance and safety of civil infrastructure projects.
Keywords: water soluble sulfates, construction soils, soil stabilization, sulfate testing, ASTM D8459-23, colorimetric method, geotechnical evaluation, sulfate-induced heave, concrete deterioration, soil testing standards.
Технические детали
- Технический комитет
- D18 - Soil and Rock
- SKU
- ASTM D8459-23
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