Lesson 5/Practice Exercise
5.
Soils with which of the following materials will cause unsatisfactory CBR Test variations?
a.
Clay or sand.
b.
Silts or gravel.
c.
Clay or silts.
d.
Gravel or stone.
6.
Which is NOT an advantage of the CBR Test?
a.
The test must be run to exact standards in order for the design tables to be valid.
b.
Testing can be done on samples representative of future water conditions.
c.
The CBR methods adapt more quickly to airfield pavement design for immediate use
than any other method.
d.
The test can be performed by personnel with relatively little experience and training.
7.
Identify the FIRST step in the test program for non-swelling soils.
a.
Establish a moisture range for CBR investigation.
b.
Perform CBR penetration tests and determine corrected CBR for each sample.
c.
Compact samples within the moisture content range of investigation.
d.
Establish the OMC of the soil at 55 blows/layer.
8.
The definition of objectionable swell is
a.
soil swell in excess of 7 percent.
b.
soil swell in excess of 5 percent.
c.
soil swell in excess of 3 percent.
d.
soil swell in excess of 1 percent.
9.
A design CBR for which of the following requires the LEAST testing?
a.
Free-draining soils.
b.
Swelling soils.
c.
Non-swelling soils.
d.
Draining soils.
135
Previous Page
