AASHTO T112
Full Name
AASHTO T112 – Standard Method of Test for Clay Lumps and Friable Particles in Aggregate
Scope
AASHTO T112 is a standard test method used to determine the percentage of clay lumps and friable particles in aggregates. This test is essential for assessing the quality of aggregates used in various construction applications, particularly in concrete and asphalt pavements. Clay lumps and friable particles are undesirable components in aggregates as they can negatively impact the strength, durability, and performance of the final product.
Key aspects of AASHTO T112:
- Purpose: the primary objective of this test is to quantify the amount of clay lumps and friable particles present in an aggregate sample. Clay lumps are defined as particles of clay that do not break down readily under normal handling and can affect the bond between the aggregate and the binder. Friable particles are defined as particles that break down easily when subjected to handling and can contribute to dust and create weak points in the pavement.
- Procedure: the test involves soaking the aggregate sample in water to soften the clay lumps and friable particles. The sample is then sieved to separate the larger aggregate particles from the smaller clay lumps and friable particles. The remaining material on the sieve is dried and weighed to determine the percentage of clay lumps and friable particles in the original sample.
- Significance: the presence of excessive clay lumps and friable particles can adversely affect the properties of concrete and asphalt pavements. They can reduce the bond strength between the aggregate and the binder, leading to decreased durability and increased susceptibility to cracking and rutting. Furthermore, friable particles can generate dust, which can create environmental and health hazards.
Applications of AASHTO T112:
- Aggregate quality control: this test is used by aggregate producers and construction contractors to ensure that the aggregates used in their projects meet the specified requirements and quality standards.
- Material selection: the results of the test can be used to evaluate the suitability of aggregates for different applications, such as determining the appropriate type of aggregate for use in concrete pavements exposed to freeze-thaw cycles.
- Performance prediction: the percentage of clay lumps and friable particles can be used to predict the potential performance of aggregates in specific applications, helping engineers and contractors make informed decisions about material selection and mix design.
AASHTO T112 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AASHTO T112 standard.
Our laboratory offers comprehensive aggregate testing services, including the determination of clay lumps and friable particles according to AASHTO T112. Our experienced technicians utilize standardized procedures and equipment to ensure the accuracy and reliability of our test results.
Contact us for more information.
Resources
Keywords
clay lumps; friable particles; aggregate; sieve; washing; soaking; drying; weighing; percentage; deleterious substances