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Nicet Level 2 Earth Work Exam (100 out of 1 0 0) Questions
and Answers (100% Verified Elaborations)
What does the Sand Cone Method Determine? In-place density of soil and aggregates Mass for sand cone test should be recorded to nearest? 0.01lbs Sand cone test can also be used to determine? Moisture content and dry mass of excavated soil How to determine percent compaction? Dry Density/Lab max density x 100 What size particles should not be used during the sand cone test? Non-Cementous with few to no particles passing #200 sieve and non-retained in #10 sieve What does the proctor test determine? Moisture density relationship of soils and soil-aggregates
What size molds are used for the proctor test? 4" molds and 6" molds What size rammers are used for the proctor test? 5lbs with 12" drop and 10lbs with 18" drop How many blows are required per mold for proctor test? 25 blows for 4" mold and 56 blows for 6" mold How many lifts are required per mold for proctor test? 4" mold requires 3 lifts while 6" mold requires 5 lifts What is the requirement for compacted depth for proctor test? 5" What is the purpose of Nuclear Density Gauge? Determines density of compacted material When is backscatter method for nuclear density gauge used? When properties of the first few inches are concerned such as HMA When is Direct Transmission for nuclear density gauge used?
What is the visual identification for Coarse Gravel? Particle of rock that will pass 3" but be retained in 3/4" sieve What is the visual identification for fine gravel? Particle of rock that will pass 3/4" and be retained on a #4 Sieve What is the visual identification of Coarse Sand? Particle of rock that will pass #4 sieve and be retained in #10 sieve What is the visual identification of medium sand? Particles of rock that will pass #10 sieve and be retained on a #40 sieve What is the visual identification of fine sand? Particles of rock that will pass #40 and be retained on a #200 Sieve What is the visual identification and classification for Silt?
- Soil passing #200 sieve that is non-plastic or slightly plastic with little to no strength when dried.
- Fine grained portion of soil with plasticity index greater to equal to 4. What is the visual identification for organic silt? Sufficient organic content to influence soil properties
What is the visual identification and classification of clay?
- Exhibits plasticity (putty like properties) within range of water contents
- Fine grained or the fine grained portion of soil with plasticity index greater or equal to 4 What is the visual identification of peat? Composite in various stages of decomposition, dark brown to black, produces organic odor and spongy consistency What is the Particle "Gravel" designation letter? Letter "G" What is the Particle "Sand" designation letter? Letter "S" What is the designation letter for " Well Graded"? Letter "W" What is the designation letter for "poorly graded"? Letter "P" What is the designation letter for "Clay"?
What are the identification letters based on characteristics for "Silt"? Letters "ML" What are the identification letters based on characteristics for "Elastic Silt"? Letters "MH" What defines a sample being fine grained or coarse grained? If sample contains 50% more of fines or if sample contains less than 50% of fines What is required when Burning Material? Watch person must be onsite and permit approved What are the steps to Bury Material?
- Place debris in alternating levels of 48"
- Cover each layer with 24" of earth material
- Stumps, logs, etc should be placed in a dense pile to minimize air voids
- Place 12" top layer of material and compact the area tree branches should be cleared over roadways and shoulders to attain what height? 20'
What should be done to damaged trees? Tree dressings should be applied What should be done to trees at the bottom of fill slopes? Should be removed beyond slope limits including rounding, unless provisions are in place for protection. What are some example of a preservations of objects when clearing and grubbing?
- Historical Markers
- Tree wells
- Historical or archeological value
- Utilities What should be done to stumps in a slope rounding areas? Stumps cut flush or below grade What should be done to trees outside excavation, embankments and slope rounding areas? Stumps cut within 6" from the ground What areas should be grubbed? only excavation areas and away from slope rounding limits How deep should grubbing be? No defined depth, enough to remove all stump, roots, buried logs and turf
Compressive strength of 1.5TSF What is Type B soil identification? Angular gravel, silt and silt loam Compressive strength of 0.5 TSF but less than 1.5TSF What is Type C soil identification? Gravel, sand and sand loam Compressive strenght of 05TSF or less What is the embankment slope tolerance? +/- 0.05 from stake line or What is the definition of a right of way? Land acquired for construction of the roadway What is the definition of an easement? Right to use another persons property for specific purpose What is the definition of Limits of disturbance? Area where construction activities must be contained
For proctor test Which methods require different molds? A & C require 4" mold and Method B and D require 6" mold What size aggregate works for using each method of the proctor test? A & B - Material passes through #4 sieve C & D - Material passes through 3/4" Sieve What method of the proctor should be used? Only when specified, if not then use Method A What is the finish tolerance for aggregate for grade using string line? Finish 0.05+/- of finished grade What is finish tolerance for aggregate when using straightedge? 1/2" per foot measuring from 2 points recording depressions What is the tolerance for nuclear density gauge? +/- 1% on density and +/- 2% on moisture In roadways what size lifts should embankment be placed? 12" lifts
Where step slopes are required what is the height of the step and require slope? 1V:2H and steps 18" high What should be done on existing slopes steeper than 1V:3H Cut horizontal benches into slope to accommodate compaction efforts What is the finish tolerance of embankment on a slope? +/-.
