AASHTO T 71-08 (2017) PDF Download

The AASHTO T 71-08 (2017) standard focuses on determining the impact of organic impurities in fine aggregate on the strength of mortar. The presence of these impurities can be indicated by conducting tests using T 21. The standard compares the compressive strengths of mortar samples made with washed and unwashed fine aggregate, allowing for a direct assessment of the effect of organic impurities on mortar strength.

It is important to note that while this method is similar to ASTM C 87/C 87M-10, it is not identical. Nevertheless, both standards share the objective of evaluating the influence of organic impurities on mortar strength. This standard provides a guideline for conducting the necessary tests to assess the quality of fine aggregate in terms of its organic impurity content, thereby ensuring the durability and structural integrity of mortar in construction applications.