Testing of industrial products - Aggregates for construction

Dutch Static Compression Test - Summary

This report gives the results of a cross-testing experiment on the determination of fragmentation resistance by a compression test - the Dutch Static Compression test. 22 laboratories from 9 countries took part. The same three materials were used in the experiment as in other cross-testing experiments in the same programme on tests of mechanical properties of aggregates.

When assessed by the criterion that the reproducibility standard deviation should not exceed 8 % of the average, the DSC test is found to have a reproducibility that is satisfactory for the purpose of assessing the compliance of aggregates with specifications that impose an upper limit on the results of the tests, except at the highest strength level. Dutch laboratories that participate in regular proficiency tests achieve better reproducibility than that observed in the cross-testing experiment at the highest strength level.

The results of the cross-testing experiment suggest that both the repeatability and the reproducibility of the DSC test reduce as the level of the test results increases.

The results obtained in the cross-testing experiment are consistent with earlier work on the correlation between the Los Angeles test and the DSC test (using a 5.00 mm test sieve). The results suggest that it might be possible to achieve a better correlation if a 1.60 mm sieve is used instead of the 5.00 mm sieve.

The DSC test showed a similar degree of sensitivity to that of the Los Angeles test when comparing the two stronger aggregates used in the experiment, but a lower degree of sensitivity when comparing the two weaker aggregates.

The repeatability of the DSC test is such that the range of the results of determinations on two specimens from the same laboratory sample should rarely exceed a critical range of 3.0 %.