CMP 305 Exam Questions With Revised
Answers
Montmorillonite is known to have what properties? - answerhigh volume changes and weak
bonds
phase diagram displays what? - answerrelationship between volume and weight of a soil
bunk
does clay absorb more or less water than other types of soils - a...
Montmorillonite is known to have what properties? - answer✔✔high volume changes and weak
bonds
phase diagram displays what? - answer✔✔relationship between volume and weight of a soil
bunk
does clay absorb more or less water than other types of soils - answer✔✔more, clay attracts
water
when is angular-granular soil at its highest shear strength? - answer✔✔when it is in a dense
condition and has a low void ratio
of the four soil groups which has the greatest expansive characteristics with water? -
answer✔✔clay
load-ability - answer✔✔measure of difficulty in excavating and loading a soil
what kind of soil has high load-ability - answer✔✔loose, granular soil
what kind of soil has low load-ability? - answer✔✔compacted (frost), clay, rock
classification for a fine grained soil being a clay or silt is based on what? - answer✔✔plasticity,
not particle size
soil with best engineering properties? - answer✔✔angular, high shear strength, good distribution
of particle sizes so they can be packed together
well graded soil - answer✔✔Soil with a variety of particle sizes that tend to form a denser
structure
poor graded soil - answer✔✔uniform particle sizes, can't be packed into eachother
the smaller the void ratio (denser the material) - answer✔✔the greater the compressive strength
of the soil resulting in low compressibility of soil
coarse soil in loose condition (like after initial placement) is more likely to have what if subject
to vibration? - answer✔✔quick volume reductions and loss of strength
gap graded soil - answer✔✔lots of large size particles and lots of small size particles, no
inbetween
is it better to have soil that is layered or mixed together? - answer✔✔layered
coarse grained soil - answer✔✔non-cohesive, sand and gravel
fine grained soil - answer✔✔cohesive, clay and silt
2 lab tests for engineering properties of soil - answer✔✔sieve and sedimentation
will coarse grained soils pass the 200 sieve? - answer✔✔no
more than 50% by weight that passes 200 sieve? - answer✔✔fine grained soil
anything that does not pass the 200 sieve with 50% by weight? - answer✔✔coarse grained soil
what would pea stone be classified as? - answer✔✔poorly, uniform, graded soil
liquid limit? - answer✔✔expressed in % of dry weight, point at which soil will begin to flow,
uses standard shake test
plastic limit? - answer✔✔moisture content in % at which the soil begins to crumble when rolled
into a 1/8th inch diameter ball
bank - answer✔✔material in its natural state, referred to as "in place", unit" BCY bank cubic
yards
unit soil weight depends on - answer✔✔soil type, soil moisture, soil compaction, density
loose - answer✔✔material that has been excavated, unit: LCY loose cubic yard
compacted - answer✔✔material after compaction, unit: CCY
swell - answer✔✔soil volume increase, after excavation, unit volume is greater due to new/more
air voids
shrinkage - answer✔✔compacted soil, decrease in void space, less volume
the greater the range of soil particle sizes - answer✔✔the smaller the total volume of void spaces
identify the soil classification system that uses a "double letter" symbol for the soil classification
group - answer✔✔unified system
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