Use of scrapers in construction advantage and disadvantage

The scraper is a large piece of equipment used in mining, construction, agriculture and other earth moving applications.

Scraper used in construction

When the hopper is full  it is raised, and closed with a vertical blade (other name :  apron). The scraper can carriage its load to the fill area where the blade is raised, the back panel of the hopper, or the ejector, is hydraulically pushed forward and the load tumbles out. Then the empty scraper returns to the cut site and repeats the cycle.