AASHTO T 71-08 (2021) PDF Download

The AASHTO T 71-08 (2021) standard describes a test method for determining the impact of organic impurities in fine aggregate on the strength of mortar. The presence of these impurities is indicated by tests conducted with AASHTO T 21. The test involves comparing the compressive strengths of mortar made with washed fine aggregate (free from organic impurities) and unwashed fine aggregate (containing organic impurities). The purpose of the test is to assess the detrimental effects of organic impurities on mortar strength.

It is important to note that while the AASHTO T 71-08 standard is similar to ASTM C 87/C 87M-10, they are not technically identical. This indicates that there may be some differences in test procedures and requirements between the two standards. The AASHTO T 71-08 (2021) standard serves as a guideline for conducting tests to evaluate the effect of organic impurities in fine aggregate on mortar strength, providing a standardized approach for assessing the quality of fine aggregate in terms of its organic impurity content.