COMPLETE QUESTIONS BANK AND CORRECT
DETAILED ANSWERS WITH RATIONALES
GUARANTEED PASS RECENT VERSION
When do you fill the flasks for the GMM with water? - ANSWER Before
the 9 minute mark while sitting
When do you cap the flasks for the GMM samples and weigh them? -
ANSWER After 9 minutes has been reached on the timer and not to exceed
11 minutes
What temperature of water is used throughout the GMM and GMB testing? -
ANSWER 77 +/- 2°F
The dry back procedure is used in what circumstance for the GMM -
ANSWER For mix designs to determine the GMM correction factor
When is the GMM dry back considered dry - ANSWER Weighed every 15
minutes and when the weight loss is less than 0.5 grams
,Formula for GMM (MSG) - ANSWER Dry Sample ÷ (SSD or Dry weight +
Flask & Water - Flask & Water & Sample)
Roadway Density Cores Formula - ANSWER (GMB ÷ GMM) × 100
If reheating the ignition sample is needed it is done at what temp? -
ANSWER 300°F +/- 9°F
Determining Mix Design Calibration Factor Formula - ANSWER Known
AC - (WL1 + WL2) ÷ 2
Determining 8 Sieve Correction Factor - ANSWER P-8[Solvent] - P-
8[Ignition]
Determining 200 Sieve Correction Factor - ANSWER P-200[Solvent] - P-
200[Ignition]
Calibrated AC Formula - ANSWER AC Measured + Correction Factor
When washing a gradation sample what do you add first water or a wetting
agent? - ANSWER Cover the sample with water first
What temperature do you dry a gradation sample at? - ANSWER 230°F-9°F
to Compaction Temp +9°F
, How long are gradations shook at? - ANSWER Determined by a
verification process
How do you verify the gradation time? - ANSWER You shake said sample
at a certain time until the hand sieveing is <0.5% of the total sample weight
for each individual sieve after one minute.
What is the hand sieveing process? - ANSWER Individually take a sieve at
a time and with a cover plate and catch pan hold at an angle and hit with the
heel of hand in an upward motion.
Rotate the sieve 1/6 of a revolution every 25 strikes.
There should be 150 strikes total/minute.
The final gradation weight must be within what of the total weight of
aggregate - ANSWER 0.2%
% Passing Formula - ANSWER 100 - ( Weight Retained ÷ Extracted Agg)
× 100
% Passing 200 Sieve Formula - ANSWER (Weight Lost from Wash +
Weight Retained) ÷ Extracted Aggregate Weight × 100
S to N - ANSWER Downstation
, W to E - ANSWER Downstation
Stationing - ANSWER Starts at 0+00
Stationing Measurement - ANSWER 1+00 is 100 feet
Straight Edge is the - ANSWER Measurement of Pavement smoothness
with a 15 foot 4.573 m rolling straightedge
Straight Edge is used to - ANSWER identify problems
Random sampling - ANSWER Are random numbers generated usually by a
VT for cores to be extracted from the roadway
How often should you calibrate a Straight edge - ANSWER Calibrate at the
start of each working period
Using the manual straight edge you find what kind of spot to place the
rolling straightedge? - ANSWER Locate a flat area with the manual
straightedge and place the rolling straightedge next to the manual
straightedge and the gauge should read 0
The 3/16 and the 3/8 shims go under which wheels during calibration -