Los Angeles Abrasion Test
Los Angeles Abrasion Test - Related Videos
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FAQs
The steel spheres provide the specified charge that repeatedly impacts and tumbles the coarse aggregate inside the rotating steel drum. This action combines mechanical impact with surface abrasion, reproducing degradation forces associated with handling, construction, and service. The resulting mass loss reflects how readily the aggregate breaks down under this controlled combination of stresses.
Evaluating abrasion alone would not capture the full mechanical action applied during the procedure. As the drum rotates, aggregate particles experience repeated tumbling, collisions, and contact with the steel spheres, producing both impact damage and surface wear. Measuring the combined effect helps engineers assess resistance to degradation under conditions relevant to aggregate use.
Percentage loss expresses the material removed or degraded during testing relative to the sample’s original mass. After the treated aggregate is sieved, the retained material is compared with that starting mass to quantify loss. A lower percentage generally indicates that the aggregate better resists breakdown, supporting its consideration for demanding engineering applications.
The procedure begins with a measured coarse-aggregate sample placed in a steel drum with a specified charge of steel spheres. The drum rotates so the particles undergo repeated tumbling, impact, and surface wear. After rotation, the material is sieved, and the retained amount is compared with the original sample mass to calculate percentage loss.
Engineers apply the result when evaluating coarse aggregates intended for concrete, asphalt, and road bases. These uses expose aggregate to handling, construction activity, and service-related degradation. The measured loss therefore helps with material selection and quality control, while also contributing to assessments of whether an aggregate is suitable for pavement-related durability requirements.
The percentage loss provides a consistent basis for comparing the degradation resistance of coarse-aggregate samples. Engineers can use that comparison during material selection and quality control to identify aggregates with lower measured loss. The result also supports pavement durability assessments by indicating how well candidate materials may resist breakdown during construction and service.