CT 125 EXAM LATEST UPDATE
What is the CT 125 test method used for? - ANSWER Procedures for
obtaining representative samples of various highway materials & products
incorporated in roadway pavement structure sections
Minimum number of splitter chutes - ANSWER For coarse aggregate -
minimum of 8; fine agg - minimum of 12;
What is t minimum width of individual chutes for sample splitters -
ANSWER Chutes shall be approx 50% larger than the largest particle size
What is the minimum sample size that should be obtained? - ANSWER
Enough to perform the specific tests needed.
A representative sample is defined as: - ANSWER The taking of all
materials in the same proportion as they exist or will be used.
What size canvas is used to split samples in the field? - ANSWER 5 ft x5ft
How many sizes of splitters are there? - ANSWER 3 - small, medium, large
When drying a sample And air drying is not practical, what temp can
material be heated at? - ANSWER 140 defrees
When is drying at 230 degrees permitted? - ANSWER When all
subsequent tests require or permit drying at 230 degrees
When combining samples, what is the preferred method? - ANSWER A
riffle splitter
If combining samples will result in samples in excess of 100lbs, what
should be done? - ANSWER Split each sample separately and combine the
smaller portions
, What temp can splitter, accessory equipment and tools be heated to? -
ANSWER 230 degrees
When drying RAP material, what temp must not be exceeded during
drying? - ANSWER 230 degrees +\- 9degree
When using riffle splitter, what condition must sample be in? - ANSWER
Free flowing
What should you do after splitting sample on a riffle splitter? - ANSWER
Clean excess material ofter each use?
Quartering a sample On a canvas can be useD on samples up to how
many pounds? - ANSWER 100 lbs
When quartering with a canvas, what other tool (s) is needed to complete
the splitting? - ANSWER Stick or shovel
After quartering a sample, what piles are used for testing? - ANSWER 2
diagonally opposite quarters
CT 125 Appendix A covers what material? - ANSWER Aggregates, Soils,
and Lime
For HMA Batch Plant aggregate sampling, the contractor is required to
provide a safe and suitable sampling device that will provide a sample of
the aggregate as its being discharged. This device needs to intercept what,
and do what?? - ANSWER The entire cross-section of the discharge
stream, and hold the material without overflowing.
For HMA Batch Plant aggregate sampling, supplemental fine aggregate
may be sampled from where? - ANSWER Feed line or surge tank
preceding the proportioning device.
Where is baghouse dust sampled from? - ANSWER From the bottom of the
baghouse, under the feed screw with a sampler that is fixed under the
baghouse
How else can baghouse dust be sampled? - ANSWER Similarly to
supplemental fine aggregates
What is the CT 125 test method used for? - ANSWER Procedures for
obtaining representative samples of various highway materials & products
incorporated in roadway pavement structure sections
Minimum number of splitter chutes - ANSWER For coarse aggregate -
minimum of 8; fine agg - minimum of 12;
What is t minimum width of individual chutes for sample splitters -
ANSWER Chutes shall be approx 50% larger than the largest particle size
What is the minimum sample size that should be obtained? - ANSWER
Enough to perform the specific tests needed.
A representative sample is defined as: - ANSWER The taking of all
materials in the same proportion as they exist or will be used.
What size canvas is used to split samples in the field? - ANSWER 5 ft x5ft
How many sizes of splitters are there? - ANSWER 3 - small, medium, large
When drying a sample And air drying is not practical, what temp can
material be heated at? - ANSWER 140 defrees
When is drying at 230 degrees permitted? - ANSWER When all
subsequent tests require or permit drying at 230 degrees
When combining samples, what is the preferred method? - ANSWER A
riffle splitter
If combining samples will result in samples in excess of 100lbs, what
should be done? - ANSWER Split each sample separately and combine the
smaller portions
, What temp can splitter, accessory equipment and tools be heated to? -
ANSWER 230 degrees
When drying RAP material, what temp must not be exceeded during
drying? - ANSWER 230 degrees +\- 9degree
When using riffle splitter, what condition must sample be in? - ANSWER
Free flowing
What should you do after splitting sample on a riffle splitter? - ANSWER
Clean excess material ofter each use?
Quartering a sample On a canvas can be useD on samples up to how
many pounds? - ANSWER 100 lbs
When quartering with a canvas, what other tool (s) is needed to complete
the splitting? - ANSWER Stick or shovel
After quartering a sample, what piles are used for testing? - ANSWER 2
diagonally opposite quarters
CT 125 Appendix A covers what material? - ANSWER Aggregates, Soils,
and Lime
For HMA Batch Plant aggregate sampling, the contractor is required to
provide a safe and suitable sampling device that will provide a sample of
the aggregate as its being discharged. This device needs to intercept what,
and do what?? - ANSWER The entire cross-section of the discharge
stream, and hold the material without overflowing.
For HMA Batch Plant aggregate sampling, supplemental fine aggregate
may be sampled from where? - ANSWER Feed line or surge tank
preceding the proportioning device.
Where is baghouse dust sampled from? - ANSWER From the bottom of the
baghouse, under the feed screw with a sampler that is fixed under the
baghouse
How else can baghouse dust be sampled? - ANSWER Similarly to
supplemental fine aggregates
