AASHTO T267
Full Name
AASHTO T267 – Standard Method of Test for Determination of Organic Content in Soils by Loss on Ignition
Scope
AASHTO T267 is a standard test method used to determine the organic content in soils by measuring the loss on ignition (LOI). The organic content of soil refers to the amount of decomposed organic matter present, which can significantly impact the soil’s engineering properties and behavior. This test is essential for geotechnical engineering and environmental assessments, as the organic content can affect soil strength, compressibility, permeability, and nutrient availability.
Key aspects of AASHTO T267:
- Purpose: the primary objective of this test is to quantify the amount of organic matter present in a soil sample by measuring the mass loss upon ignition at a high temperature.
- Principle: the test involves drying a soil sample to remove moisture, then heating it to a high temperature (typically 440 °C) in a muffle furnace. The organic matter in the soil is oxidized and volatilized, resulting in a loss of mass. The percentage of organic content is calculated based on this mass loss.
- Procedure: AASHTO T267 outlines a detailed procedure for preparing the soil sample, drying it, and then igniting it in a muffle furnace for a specified duration. The sample is then cooled and reweighed, and the organic content is calculated as the percentage mass loss.
- Limitations: the test is most applicable to soils with relatively high organic content, such as peats, organic mucks, and soils containing undecayed plant material. The test may not be suitable for soils with low organic content or those containing inorganic materials that decompose at high temperatures.
Significance of AASHTO T267:
- Geotechnical engineering: the organic content of soil influences its engineering properties, such as compressibility, shear strength, and permeability. This information is crucial for the design of foundations, embankments, and other earthworks.
- Environmental assessment: the organic content of soil is an important parameter for environmental assessments, as it can affect the soil’s ability to retain nutrients, filter pollutants, and support plant growth.
- Land use planning: the organic content data can be used for land use planning and zoning decisions, particularly in areas with sensitive environmental conditions.
AASHTO T267 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AASHTO T267 standard.
Our laboratory offers comprehensive soil testing services, including the determination of organic content by loss on ignition according to AASHTO T267. Our experienced technicians utilize calibrated equipment and adhere to strict quality control procedures to provide accurate and reliable results for your geotechnical and environmental projects.
Contact us for more information.
Resources
Keywords
organic content; loss on ignition; soil; muffle furnace; ash; organic matter; combustion; weight loss