After the quartering process, what should be done with the opposite corners taken?

The correct approach after the quartering process involves using a brush to collect fines from the opposite corners. This step is crucial because, during sampling, the quartering process is intended to obtain a representative sample of aggregate by progressively reducing the material size. The fines that may accumulate in the corners can influence the sample's accuracy and quality. By brushing these fines back into the sample, you ensure that the entire mix is consistent and representative of the larger pile.

Fines can significantly affect the physical and mechanical properties of the aggregate and can alter the performance of the mixture in its final application. Thus, collecting these fines allows for a more precise analysis of the aggregate's characteristics. Handling the sample properly in this way enhances the reliability and validity of the test results that will follow.