Plotting aggregate degradation results from the Los Angeles test on a triangular diagram: proposal of a new quality ranking for aggregates

Aggregates used in construction work are tested and classified by standard European test methods. In the Nordic countries, the requirements for aggregates are quite high, especially for those used in road surfaces, due to the use of studded tires. Both the Los Angeles and Nordic tests define the required quality of the aggregate. These two test methods express the resistance of an aggregate to fragmentation and wear, respectively. Fragmentation-induced degradation of the aggregate occurs during the test process, and it is essential to understand and measure this degradation when evaluating the properties of the aggregate. The quality of the aggregate and the degradation process can be visualized by plotting the degradation results in a triangular diagram (a tri-plot). Such tri-plots can then be used as the basis for a new ranking of aggregates.