3-56.When, if ever, should a base courseof sandy and gravelly material beused?1.For light loads withlow-bearing values2.For limited use3.For heavy loads withhigh-bearing values4.Never3-57.A coarse, crushed aggregate isplaced in a relatively thin layerand rolled into place. This isthe first step in preparing whattype of base?1.Stabilized2.Coarse graded3.Waterbound4.Macadam3-58.When sand, gravel, and crushed rockare not available, a base coursecan be developed from which of thefollowing materials?1.Cinders2.Iron ore3.Shells4.Each of the above3-59.What is the most importantconsideration when using caliche?1.Moisture content2.Gradation3.Compactive effort4.Drainage3-60.What type of equipment isrecommended for the compaction oftuff?1.Grader2.Scraper3.Sheepsfoot roller4.Smooth drum roller3-61.What is the maximum lift for abituminous base course, in inches?1. 1.52. 2.53. 3.54. 4.53-62.What thickness of bituminous basecourse, in inches, is equal to 6inches of concrete base course?1. 62. 83. 34. 420
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