A study has been made of the Los Angeles abrasion test in relation to the compressive strength of a wide variety of rocks being quarried to meet the growing demand for aggregates around Jeddah. It was found that the results of compressive strength as determined by the Schmidt rebound hammer could be used to predict the Los Angeles abrasion test results.

The aggregates tested are of volcanic and plutonic origins and are basic to acidic in composition. A rock material strength map of the Jeddah area illustrates that most of the coarse-grained plutonic rocks are of low strength and the corresponding Los Angeles abrasion values for these rocks are high, rendering them unsuitable, — especially when the aggregate is to be used in road or building construction or is to be subjected to high wear.

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