EARTHWORK EXAM 1 QUESTIONS AND
ANSWERS UPDATED (2024/2025)
(VERIFIED ANSWERS)
proctor test - ANS ✓R.R. procotor developed to determine moisture-density
relationship in soils subjected to compaction. standard test 5.5lb rammer, 12 in
drop, 3 layers. Modified test 10lb rammer, 18 in drop, 5 layers.
drying out wet soil - ANS ✓aerate or add a soil stabilization agent. Lime or fly
ash is for fine-grained soils. Mechanically it can be done by scarifying the soil
with a grader
soil limits - ANS ✓were developed to serve as reference points in order to
differentiate between highly plastic, slightly plastic, and nonplastic materials
fine grained soils - ANS ✓silts and clays, low and high plasticity
soil - ANS ✓loose surface of earths crust, created naturally from the
disintegration of rocks or decays of vegetation
Payload - ANS ✓volumetric= capacity in terms of cubic ayrds
gravimetric = capacity based on safe operating weight
required power - ANS ✓Total resistance = Rolling resistance + Grade Resistance
1
EARTHWORK EXAM
, EARTHWORK
rolling resistance - ANS ✓wheel resistance = vehicle weight in tons x rolling
resistance
track resistance = vehicle weight in tons x (rolling resistance - 110lbs/ton)
nebraska test - ANS ✓subtraction of rolling resistance in drawbar pull.
110lbs/ton
grade resistance - ANS ✓for ever 1 ft rise or fall of road is equivalent to 1% rise
or fall
equivalent grade - ANS ✓RR + GR and expressed as a % gradient
rimpull - ANS ✓power of tractive force between the rubber wheels and the
surface the vehicle is traveling on. TR = rimpull of wheeled vehicles
drawbar pull - ANS ✓power of tractice force between the tracks and surface of
the road. TR = drawbar pull of track
coeffecient of traction - ANS ✓total usable energy that can be applied before
slippage of the tires or tracks occur. usable force = weight of vehicle x coeffecient
of traction
operating cost of truck tires - ANS ✓35%
Production issue position - ANS ✓trucks should not back up
Differing site Conditions - ANS ✓type 1 - actual conditions differ materially
from those indicated in the contract
type 2 - actual conditions differ from reasonable expectations
2
EARTHWORK EXAM
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