Evaluation of Test Methods for Determination of Aggregate Specific Gravity;Final rept

摘要

The current AASHTO procedures for determination of specific gravity and absorption of coarse and fine aggregates are time consuming and the repeatability is less than generally desired. This is especially true for angular fine aggregates with high absorption and rough surface textures. There are two new methods currently available for determining bulk specific gravity and absorption of coarse and fine aggregates, the AggPlus(trademark) system using the CoreLok device and the SSDetect system. The AggPlus(trademark) system applicable to both coarse and fine aggregates, and blended aggregate gradations. The SSDetect system is applicable to fine aggregates only. The objectives of this study were to determine if either the AggPlus(trademark) system or the SSDetect system could produce statistically similar results to the current AASHTO procedures. A total of eight coarse aggregate sources and 15 fine aggregate sources were selected for evaluation in this study and the specific gravity and absorption determine using each procedure.