ASTM D4219-22 PDF
Standard Test Method for Short-Term Unconfined Compressive Strength Index of Chemically Grouted Soils
Standard Test Method for Short-Term Unconfined Compressive Strength Index of Chemically Grouted Soils
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 4
- Дата публикации:
- 1 октября 2022 г.
- Издание:
- D4219
- ICS:
- 93.020
SIGNIFICANCE AND USE 5.1 The purpose of this test method is to obtain values for comparison with other test values to verify uniformity of materials or the effects of controllable variables, in grout-soil compositions. 5.2 This test method is similar, in principle, to Test Method D2166/D2166M, but is not intended for determination of strength parameters to be used in design. Such values are more properly obtained from long-term triaxial tests. Note 1: 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 This test method covers the determination of the short-term unconfined compressive strength index of chemically grouted soils, using displacement-controlled application of test load. 1.2 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 1.2.1 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft3 shall not be regarded as nonconformance with this standard. 1.3 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. 1.3.1 For purposes of comparing a measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal of significant digits in the specified limit. 1.3.2 The procedures used to specify how data are collected/recorded or 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 this standard to consider significant digits used in analysis methods for engineering design. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D4219-22 is the Standard Test Method for Short-Term Unconfined Compressive Strength Index of Chemically Grouted Soils, published by ASTM International. This method provides guidelines for determining the short-term unconfined compressive strength index of chemically grouted soils using displacement-controlled testing. The standard is essential for the geotechnical and construction industries, particularly for verifying the uniformity of chemically grouted soil materials and assessing the effects of controllable variables in grout-soil compositions.
Crucially, the test is intended for indexing and comparison purposes, rather than for design or long-term engineering parameter determination. The values obtained help verify consistency in laboratory or field grouting procedures, making this standard a valuable tool in quality control and research.
Key Topics
- Chemically Grouted Soil Testing: Focuses on soils treated with chemical grouts to evaluate short-term strength characteristics using unconfined compression.
- Displacement-Controlled Application: Utilizes a constant rate of axial deformation until soil specimen failure or a set strain is reached.
- Index Property Measurement: Provides a rapid means of comparing treatment effectiveness across different grouting methods and materials.
- Uniformity and Control: Enables assessment of material uniformity and the impact of test variables, such as specimen preparation and curing conditions.
- Standardized Reporting: Requires adherence to SI units and established practices for significant digits and data recording, ensuring reliable and consistent reporting across the industry.
Applications
ASTM D4219-22 is widely used in several practical scenarios:
- Quality Control of Grouted Soils: Verifies the uniformity of chemically grouted soil specimens in laboratory and field projects.
- Comparative Analysis: Assesses the effects of different grouting materials, recipes, or procedures by comparing compressive strength indices.
- Research and Development: Supports the development and evaluation of new grouting technologies and soil stabilization methods.
- Material Consistency Checks: Monitors batch-to-batch variations in soil and grout mixtures during construction.
- Educational and Training Purposes: Provides a benchmark test method for students and professionals learning about geotechnical grouting and soil improvement.
It is important to note that this test is not intended to generate data for engineering design. For design purposes, long-term triaxial tests or other methods are recommended. ASTM D4219-22 is ideal for rapid strength index assessment rather than detailed characterization.
Related Standards
For those working with chemically grouted soils and geotechnical testing, the following ASTM standards are referenced or closely related:
- ASTM D2166/D2166M: Test Method for Unconfined Compressive Strength of Cohesive Soil
- ASTM D653: Terminology Relating to Soil, Rock, and Contained Fluids
- 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 D4320: Practice for Laboratory Preparation of Chemically Grouted Soil Specimens for Obtaining Engineering Parameters
- ASTM D6026: Practice for Using Significant Digits and Data Records in Geotechnical Data
- ASTM D6913/D6913M: Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis
Conclusion
ASTM D4219-22 is a vital standard for grouting specialists, laboratory technicians, and quality assurance professionals. By providing an industry-accepted method for short-term compressive strength assessment of grouted soils, it plays an integral role in material verification and process optimization. As with any geotechnical standard, adherence to proper procedures, equipment calibration, and competent personnel are key for obtaining reliable and meaningful results. Always consult related ASTM standards for comprehensive soil testing and reporting protocols.
Технические детали
- Технический комитет
- D18 - Soil and Rock
- SKU
- ASTM D4219-22
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