Washing / Classifying

Quiz

1. Sand and gravel deposits are the result of what?

2. What percentage of sand and gravel is processed from riverbed dredging?

3. What is used to dig up sand and gravel from under water?

4. Sand and gravel are preferred and stable materials for what?

5. When combined with a Portland cement binder, sand and gravel become the principal ingredients in what construction material?

6. What do sand and gravel producers use to separate and re-blend sand?

7. What are sand classifying plants used for?

8. What percentage of classifying plants in use are stationary?

9. What are hydrocyclones used for?

10. Each re-blended product is made of a different mixture or recipe of particle sizes called what?

Quiz Answers

1. Geological erosive forces of water, wind and ice

2. 70 percent

3. A dredge

4. For fills and as a base course for pavements and other structures

5. Concrete

6. Water and the principles of gravity and settling

7. They provide a method to remove water from sand that had been dredged from river bottoms.

8. Roughly 60 percent

9. To separate water from fine particles in slurry

10. Specification