The motives and historical background for developing a new test for the abrasion resistance of armourstone are described. A brief and critical account of several abrasion tests often used for rock and rock aggregate quality specification is given. The development of a new mill abrasion apparatus and test procedure used at Queen Mary and Westfield College, which overcomes some of the main shortcomings of other tests, is explained.
The abrasion mill test uses increments of milling time to generate a weight loss curve, the slope of which gives the abrasion resistance index. This new index, ks is compared with wet attrition and aggregate abrasion values for a suite of 11 rocks with wide ranging strengths. Los Angeles Abrasion Test results are briefly mentioned. The weight loss plots and values of ks from many rock samples are presented showing highly discriminating and reproducible results over the whole range from soft chalk to a tough gneiss. The plots give an immediate physical interpretation of likely comparative degradation rates.
Prediction of degradation rates from mill abrasion test results, is discussed briefly. This prediction uses a previously published degradation model for armourstone that takes account of site conditions.
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