Methods for testing the compaction quality.

In the specifications for earthworks for roads the values of compaction quality (degree of proctor density, resilient modulus, degree of air void) are defined as 10%-quantiles. In the tender papers must be said, in which way (testing methods) the testing must be organised. There are 3 methods: testing plans are well known from industrial production. For earthworks at first we have to define pieces which are produced: That shall be areas of 1 m.. Then we have to limit a testing area. Next we choose a testing plan : sampling by attributes or sampling by variables in single, double or consecutive testing plans. To each testing plan belongs depending on the largeness of the testing area a fixed number of tests. The location of the tests is chosen by random. With the test results is calculated with the special rules of decision the quality-value. The-limits for the quality-value a given in the specifications. The comparison of the calculated quality-value with that one from the specifications leads to the result "accepting or refusing of the tested area". Method M2: Testing with a vibrating roller with special measuring equipment Modern vibrating rollers have a special measuring equipment with is based on the comparison of the vibrating wave of the roller and the reflected ware from the compacted soil. These results are built for every 0,5 m way of the roller. So we get a result (with a width of the roller of 2 m) for every m.. The results of the roller can be compared with conventional tests. So we get a correlation between the roller-results and the normal test results. From this correlation we can find a specification for the roller results as a quality of conformance but for the special characteristics of the constructing site. There is good experience with this testing method in soils with less than 15 M.-% under 0,063 mm. Method M3: Testing with a description for work and single tests On a new construction site at first we have to test the roller. He must be able to compact the special soil to the value of the specifications. This is tested on a testing field. The results lead to a description in behalf of the work of the roller-driver (max. thickness of the layer, number of passes of the roller, velocity of the roller, characteristics of the soil). Theoretically the compaction must be sufficient when the compaction is done in the same soil with the same description for work. For assurance of the quality a few single conventional tests should be carried out. For the covering abstract see ITRD E135448.