CT 231 EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
What does this test method explain? - ANS the procedure for selecting a test area for the
determination of in-place wet density and moisture content of untreated and treated soils and
aggregates by the use of a nuclear gage and the determination of relative compaction.
Two parts of this test method - ANS - Determination of In-Place Wet Density and Moisture
Content
- Determination of Relative Compaction
Equipment used - ANS
Nuclear gauge - ANS a portable instrument containing radioactive sources, detectors,
electronics and battery packs. The instrument must be calibrated in accordance with California
Test 111.
Reference standard block - ANS a block provided by the gage manufacturer primarily for
checking instrument operation and for establishing standard counts against which future
measurements are compared.
@2026/2027 ALLRIGHTS RESERVED.
, Metal guide plate - ANS the guide plate should be no smaller in any dimension than the
footprint of the nuclear gage. The plate must be flat to a tolerance of 1/16 in. in any plane
Pin - ANS meets the gage manufacturer's specifications or suitable equipment (e.g., slide
hammer, drill) capable of producing a hole meeting the manufacturer's requirements and
without disturbing the surrounding material to be tested.
Procedure - ANS
Part 1: DETERMINATION OF IN-PLACE WET DENSITY AND MOISTURE CONTENT - ANS
Standardization of nuclear gauge for wet density and moisture content - ANS - Follow
manufacturer's instruction for start-up.
- Set the manufacturer's reference standard block a minimum of 5 ft from any object and a
minimum of 25 ft from any other nuclear gage to avoid any
influence to the readings.
- Place the gage on the reference standard block in the closed (safe) position and
take one 4 min density and moisture counts.
Record the data on the Relative
Compaction Test - Nuclear Report form (Form TL 2148 - Figure 3, Column A for density and
Column F for moisture and on the gage logbook.
Note: The 4 min counts are required to be within the acceptable deviation
limits (ADL) stated in the most recent calibration table (within the last 12 months established in
accordance with California Test 111
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
What does this test method explain? - ANS the procedure for selecting a test area for the
determination of in-place wet density and moisture content of untreated and treated soils and
aggregates by the use of a nuclear gage and the determination of relative compaction.
Two parts of this test method - ANS - Determination of In-Place Wet Density and Moisture
Content
- Determination of Relative Compaction
Equipment used - ANS
Nuclear gauge - ANS a portable instrument containing radioactive sources, detectors,
electronics and battery packs. The instrument must be calibrated in accordance with California
Test 111.
Reference standard block - ANS a block provided by the gage manufacturer primarily for
checking instrument operation and for establishing standard counts against which future
measurements are compared.
@2026/2027 ALLRIGHTS RESERVED.
, Metal guide plate - ANS the guide plate should be no smaller in any dimension than the
footprint of the nuclear gage. The plate must be flat to a tolerance of 1/16 in. in any plane
Pin - ANS meets the gage manufacturer's specifications or suitable equipment (e.g., slide
hammer, drill) capable of producing a hole meeting the manufacturer's requirements and
without disturbing the surrounding material to be tested.
Procedure - ANS
Part 1: DETERMINATION OF IN-PLACE WET DENSITY AND MOISTURE CONTENT - ANS
Standardization of nuclear gauge for wet density and moisture content - ANS - Follow
manufacturer's instruction for start-up.
- Set the manufacturer's reference standard block a minimum of 5 ft from any object and a
minimum of 25 ft from any other nuclear gage to avoid any
influence to the readings.
- Place the gage on the reference standard block in the closed (safe) position and
take one 4 min density and moisture counts.
Record the data on the Relative
Compaction Test - Nuclear Report form (Form TL 2148 - Figure 3, Column A for density and
Column F for moisture and on the gage logbook.
Note: The 4 min counts are required to be within the acceptable deviation
limits (ADL) stated in the most recent calibration table (within the last 12 months established in
accordance with California Test 111
@2026/2027 ALLRIGHTS RESERVED.
