CE337 LABORATORY FINAL EXAM QUESTIONS AND
CORRECT ANSWERS
Fine aggregate - answers - aggregates that pass through the 4.75 mm sieve (#4 sieve)
Typical unit weight of aggregates - answers - 90 to 120 lb/ft^3
Specific gravity - answers - a ratio of the density of a substance to the density of a
standard substance, usually water
Specific gravity of aggregates - answers - 2.3 to 2.9
Specific gravity of cement - answers - 3.15
Specific gravity of water - answers - 1
Negative free moisture - answers - will absorb water
Positive free moisture - answers - will release water
Well or dense graded - answers - contains all aggregate sizes
Uniformly graded - answers - contains only one aggregate size
Gap graded - answers - missing one or more aggregate sizes
Open graded - answers - missing all small aggregate sizes
Uniformity coefficient - answers - values from 4 to 6 indicate well graded soil, less than
4 is classified as poorly graded (equal to one indicates uniformly graded)
Coefficient of curvature - answers - values between 1 and 3 indicated will graded soils,
while value of 1 indicated uniformly graded soil
Higher the fm - answers - coarser the sand
Lower the fm - answers - finer the sand
Typical fm range for fine aggregate - answers - 2.3 to 3.1
Grain size axis - answers - plotted in logarithmic scale against percent passing (y-axis)
, Slump test procedure - answers - to be completed in more more than 5 minutes, time
from filling the cone to determine slump should be within 2.5 minutes
Relative yield greater than 1 - answers - indicates an excess of concrete being
produced
Relative yield less than 1 - answers - indicated the batch to be short of its designed
volume
Higher penetration values - answers - softer consistency
Three pavement design temperatures required for binder specifications - answers -
maximum, intermediate and a minimum temperature
Laboratory tests that evaluate rutting potential ... - answers - use the maximum
pavement design temperature
Thermal-cracking tests ... - answers - use the minimum pavement design temperature
plus 10 degrees celsius (18 degrees fahrenheit)
Moisture states used to calculate moisture content - answers - stock and oven-dry
Moisture states used to calculate absorption capacity - answers - oven-dry and ssd
In pcc mix design, required quantity of cement is calculated after calculating the amount
of water required - answers - true
Coarse aggregate is not part of the standard mortar mixture - answers - true
Increased water content, improves workability but decreases strength - answers - true
Air entrainment is required whenever concrete is exposed to freeze-thaw and deicing
salts - answers - true
In dsr test, the phase angle increases with increasing temperature - answers - true
Traditional penetration test for asphalt binder is not part of the pg asphalt binder system
- answers - true
As temperature increases, viscosity of binder decreases - answers - true
Flash point temperature test, part of pg asphalt binder system, is used to determine low
temperature cracking (thermal cracking) - answers - false
If asphalt sample a has a greater penetration value than sample b, then it is said that
sample a is more viscous than sample b - answers - false
CORRECT ANSWERS
Fine aggregate - answers - aggregates that pass through the 4.75 mm sieve (#4 sieve)
Typical unit weight of aggregates - answers - 90 to 120 lb/ft^3
Specific gravity - answers - a ratio of the density of a substance to the density of a
standard substance, usually water
Specific gravity of aggregates - answers - 2.3 to 2.9
Specific gravity of cement - answers - 3.15
Specific gravity of water - answers - 1
Negative free moisture - answers - will absorb water
Positive free moisture - answers - will release water
Well or dense graded - answers - contains all aggregate sizes
Uniformly graded - answers - contains only one aggregate size
Gap graded - answers - missing one or more aggregate sizes
Open graded - answers - missing all small aggregate sizes
Uniformity coefficient - answers - values from 4 to 6 indicate well graded soil, less than
4 is classified as poorly graded (equal to one indicates uniformly graded)
Coefficient of curvature - answers - values between 1 and 3 indicated will graded soils,
while value of 1 indicated uniformly graded soil
Higher the fm - answers - coarser the sand
Lower the fm - answers - finer the sand
Typical fm range for fine aggregate - answers - 2.3 to 3.1
Grain size axis - answers - plotted in logarithmic scale against percent passing (y-axis)
, Slump test procedure - answers - to be completed in more more than 5 minutes, time
from filling the cone to determine slump should be within 2.5 minutes
Relative yield greater than 1 - answers - indicates an excess of concrete being
produced
Relative yield less than 1 - answers - indicated the batch to be short of its designed
volume
Higher penetration values - answers - softer consistency
Three pavement design temperatures required for binder specifications - answers -
maximum, intermediate and a minimum temperature
Laboratory tests that evaluate rutting potential ... - answers - use the maximum
pavement design temperature
Thermal-cracking tests ... - answers - use the minimum pavement design temperature
plus 10 degrees celsius (18 degrees fahrenheit)
Moisture states used to calculate moisture content - answers - stock and oven-dry
Moisture states used to calculate absorption capacity - answers - oven-dry and ssd
In pcc mix design, required quantity of cement is calculated after calculating the amount
of water required - answers - true
Coarse aggregate is not part of the standard mortar mixture - answers - true
Increased water content, improves workability but decreases strength - answers - true
Air entrainment is required whenever concrete is exposed to freeze-thaw and deicing
salts - answers - true
In dsr test, the phase angle increases with increasing temperature - answers - true
Traditional penetration test for asphalt binder is not part of the pg asphalt binder system
- answers - true
As temperature increases, viscosity of binder decreases - answers - true
Flash point temperature test, part of pg asphalt binder system, is used to determine low
temperature cracking (thermal cracking) - answers - false
If asphalt sample a has a greater penetration value than sample b, then it is said that
sample a is more viscous than sample b - answers - false
