CTM 375 EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
What does ctm 375 describe? - ANS determining the average in-place density and relative
compaction of HMA
minimum lift thickness for HMA? - ANS 0.10ft (1.2")
minimum test strip dementions? - ANS at least 600 ft long, one traffic lane wide
what do you do if you cant find a test strip long enough? - ANS reduce the test strip length or
combine broken segments to achieve 600 ft
minimum amount of tests on the test strip? - ANS 10 test sites
how mant sets of cores are to be taken? - ANS 1 set of two cores (4"-6" diameter)
where are the cores taken from? - ANS from within the outlined test position of the nuke
gage for each of the test sites.
@2026/2027 ALLRIGHTS RESERVED.
, what do you do if the cores are damaged? - ANS discard and replaced by additional cores
from the same test site
what if avg core density does not agree within 0.05 g/cc? - ANS exclude all the data from this
site.
how to Determine the correlation value for each test site - ANS subtract the average nuclear
density from the average core density for the site.
what If any correlation value varies from the average correlation value by more than two
standard deviations at the 95 % confidence level? - ANS consider this correlation value
statistically invalid and exclude it from the data
how many test sites per 500 tons of HMA placed? - ANS 10 test sites
how to determine the conversion factor? - ANS average the valid correlation values and
record the conversion factor
how may test site for areas containg less than 500 tons of HMA? - ANS one test site for each
50 tons or portion of HMA placed.
minimum number of test sites? - ANS 5 test sites
how to determine test site locations? - ANS uning table 1 or 2 based on number of tests
when would you use table 2 to determine test locations? - ANS under 10 sites to be tested
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
What does ctm 375 describe? - ANS determining the average in-place density and relative
compaction of HMA
minimum lift thickness for HMA? - ANS 0.10ft (1.2")
minimum test strip dementions? - ANS at least 600 ft long, one traffic lane wide
what do you do if you cant find a test strip long enough? - ANS reduce the test strip length or
combine broken segments to achieve 600 ft
minimum amount of tests on the test strip? - ANS 10 test sites
how mant sets of cores are to be taken? - ANS 1 set of two cores (4"-6" diameter)
where are the cores taken from? - ANS from within the outlined test position of the nuke
gage for each of the test sites.
@2026/2027 ALLRIGHTS RESERVED.
, what do you do if the cores are damaged? - ANS discard and replaced by additional cores
from the same test site
what if avg core density does not agree within 0.05 g/cc? - ANS exclude all the data from this
site.
how to Determine the correlation value for each test site - ANS subtract the average nuclear
density from the average core density for the site.
what If any correlation value varies from the average correlation value by more than two
standard deviations at the 95 % confidence level? - ANS consider this correlation value
statistically invalid and exclude it from the data
how many test sites per 500 tons of HMA placed? - ANS 10 test sites
how to determine the conversion factor? - ANS average the valid correlation values and
record the conversion factor
how may test site for areas containg less than 500 tons of HMA? - ANS one test site for each
50 tons or portion of HMA placed.
minimum number of test sites? - ANS 5 test sites
how to determine test site locations? - ANS uning table 1 or 2 based on number of tests
when would you use table 2 to determine test locations? - ANS under 10 sites to be tested
@2026/2027 ALLRIGHTS RESERVED.
