AASHTO T104
Full Name
AASHTO T104 – Standard Method of Test for Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate
Scope
AASHTO T104 is a standard test method used to assess the soundness and durability of aggregates by subjecting them to repeated cycles of immersion in a saturated solution of sodium sulfate or magnesium sulfate followed by oven drying. This test simulates the weathering effects that aggregates experience in real-world conditions, particularly the expansion and contraction caused by moisture absorption and drying.
Key aspects of AASHTO T104:
- Test principle: the test involves immersing prepared aggregate samples in a saturated solution of sodium sulfate or magnesium sulfate for a specified period. The samples are then oven-dried, causing the salt to crystallize within the pores of the aggregate. The crystallization process exerts internal pressure on the aggregate, simulating the stresses caused by freezing water in cold climates. This cycle of immersion and drying is repeated multiple times to evaluate the aggregate’s resistance to disintegration.
- Evaluation: after completing the specified number of cycles, the samples are washed, dried, and sieved to determine the percentage loss of material. This loss is a measure of the aggregate’s soundness and its ability to withstand weathering effects.
- Test procedures: AASHTO T104 outlines different procedures for testing different types of aggregates, including coarse aggregates, fine aggregates, and mixtures. The number of cycles and the choice of salt solution (sodium sulfate or magnesium sulfate) vary depending on the type of aggregate and the intended application.
Significance of AASHTO T104:
- Durability assessment: the soundness test is a crucial tool for evaluating the long-term durability of aggregates, especially in regions with harsh climates where freeze-thaw cycles are common.
- Material selection: by assessing the soundness of different aggregates, engineers can make informed decisions about the most suitable materials for specific projects, ensuring the longevity and performance of the concrete.
- Quality control: AASHTO T104 provides a standardized test method for evaluating the soundness of aggregates, ensuring consistency and reliability in the assessment of aggregate quality across different laboratories and projects.
AASHTO T104 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AASHTO T104 standard.
Our laboratory offers comprehensive aggregate testing services, including the evaluation of soundness according to AASHTO T104. Our experienced technicians utilize modern equipment and adhere to strict quality control procedures to provide accurate and reliable test results for your construction projects.
Contact us for more information.
Resources
Keywords
aggregate; soundness; sodium sulfate; magnesium sulfate; weathering; disintegration; durability; solution; immersion; drying; loss; cycle