DPWH STANDARDS PART 1 EXAM
QUESTIONS WITH CORRECT
ANSWERS
Fill the spaces between them with finer material - Answer-What critical step must be
taken when placing individual large rocks and boulders to ensure a stable
embankment?
False - Answer-(True or False) The specification allows the layer thickness for rocky
material to be equal to the approximate average size of the larger rocks, even if that
average is 700 mm.
To fill voids and create a smoother, more uniform surface - Answer-What is the primary
purpose of using "spalls and finer fragments of earth" during the leveling process?
False - Answer-(True or False) Material containing more than 25% large rocks can be
used in the final 150 mm below the finished subgrade.
suitable, 200 mm (8 inches) - Answer-The final 300 mm of the embankment below
subgrade must be composed of ________ material placed in layers not exceeding
________ in loose thickness
To ensure no layer is covered by the next before its compaction is verified - Answer-
Why is it critical to keep dumping areas and rolling/compaction areas separate during
construction?
True - Answer-(True or False) Construction equipment should distribute over the later of
a newly placed layer to minimize the area that gets disturbed
Written compaction proposals for each fill material type - Answer-What must a
contractor submit to the Engineer before starting embankment construction?
number of passes required - Answer-The contractor's compaction proposal must detail
the relationship between the type of equipment, the method of adjusting moisture
content, and the ________
True - Answer-(True or False) Compaction trials are mandatory and must be completed
and approved before work even if the contractor has used the same equipment on a
previous project
, To prove that the proposed methods can consistently achieve the specified compaction
- Answer-What is the primary purpose of the full-scale compaction trial?
False - Answer-(True or False) Once the compaction trials are complete, the contractor
is free to modify the compaction procedures as they see fit to speed up work.
95 - Answer-The specification requires the contractor to achieve a uniform density of not
less than ________ percent of the maximum dry density determined by AASHTO T 99.
three tests for each 500 meters of layer length - Answer-What is the minimum required
testing frequency for in-situ density on a compacted embankment layer?
True - Answer-(True or False). If field density tests show the compaction does not meet
the 95% requirement, the contractor will rework the area till it passes.
adherence to an approved roller pattern from a compaction trial - Answer-Acceptance of
compaction can be based on?
Engineer - Answer-The standard test methods for field density, such as AASHTO T 191
and T 205, are performed by the ________ during the progress of the work
False - Answer-(True or False). Standard field density tests (like AASHTO T 99) are
required to verify the compaction of rock embankments.
To create dense mass - Answer-What is the primary purpose of depositing "earth or
other fine material" in a rock embankment?
Three - Answer-For a rock embankment, a vibratory roller or compactor must make a
minimum of ________ complete passes over each layer.
placing fines and roller passes - Answer-How is adequate compaction ensured for a
rock embankment if den sity tests cannot be used?
Rounding - Answer-The process of creating a smooth, curved transition at the tops and
bottoms of slopes instead of a sharp, angular edge.
Warping - Answer-The gradual adjustment and blending of slopes to preserve existing
features (like trees or rock) and to create a smooth, flowing transition between different
surfaces.
At the top and bottom of all slopes except in solid rock - Answer-Where exactly is
"Rounding" required to be applied on a project site?
staircase or small horizontal steps - Answer-For cut slopes in soft rock, what specific
shape must the final slope have?
QUESTIONS WITH CORRECT
ANSWERS
Fill the spaces between them with finer material - Answer-What critical step must be
taken when placing individual large rocks and boulders to ensure a stable
embankment?
False - Answer-(True or False) The specification allows the layer thickness for rocky
material to be equal to the approximate average size of the larger rocks, even if that
average is 700 mm.
To fill voids and create a smoother, more uniform surface - Answer-What is the primary
purpose of using "spalls and finer fragments of earth" during the leveling process?
False - Answer-(True or False) Material containing more than 25% large rocks can be
used in the final 150 mm below the finished subgrade.
suitable, 200 mm (8 inches) - Answer-The final 300 mm of the embankment below
subgrade must be composed of ________ material placed in layers not exceeding
________ in loose thickness
To ensure no layer is covered by the next before its compaction is verified - Answer-
Why is it critical to keep dumping areas and rolling/compaction areas separate during
construction?
True - Answer-(True or False) Construction equipment should distribute over the later of
a newly placed layer to minimize the area that gets disturbed
Written compaction proposals for each fill material type - Answer-What must a
contractor submit to the Engineer before starting embankment construction?
number of passes required - Answer-The contractor's compaction proposal must detail
the relationship between the type of equipment, the method of adjusting moisture
content, and the ________
True - Answer-(True or False) Compaction trials are mandatory and must be completed
and approved before work even if the contractor has used the same equipment on a
previous project
, To prove that the proposed methods can consistently achieve the specified compaction
- Answer-What is the primary purpose of the full-scale compaction trial?
False - Answer-(True or False) Once the compaction trials are complete, the contractor
is free to modify the compaction procedures as they see fit to speed up work.
95 - Answer-The specification requires the contractor to achieve a uniform density of not
less than ________ percent of the maximum dry density determined by AASHTO T 99.
three tests for each 500 meters of layer length - Answer-What is the minimum required
testing frequency for in-situ density on a compacted embankment layer?
True - Answer-(True or False). If field density tests show the compaction does not meet
the 95% requirement, the contractor will rework the area till it passes.
adherence to an approved roller pattern from a compaction trial - Answer-Acceptance of
compaction can be based on?
Engineer - Answer-The standard test methods for field density, such as AASHTO T 191
and T 205, are performed by the ________ during the progress of the work
False - Answer-(True or False). Standard field density tests (like AASHTO T 99) are
required to verify the compaction of rock embankments.
To create dense mass - Answer-What is the primary purpose of depositing "earth or
other fine material" in a rock embankment?
Three - Answer-For a rock embankment, a vibratory roller or compactor must make a
minimum of ________ complete passes over each layer.
placing fines and roller passes - Answer-How is adequate compaction ensured for a
rock embankment if den sity tests cannot be used?
Rounding - Answer-The process of creating a smooth, curved transition at the tops and
bottoms of slopes instead of a sharp, angular edge.
Warping - Answer-The gradual adjustment and blending of slopes to preserve existing
features (like trees or rock) and to create a smooth, flowing transition between different
surfaces.
At the top and bottom of all slopes except in solid rock - Answer-Where exactly is
"Rounding" required to be applied on a project site?
staircase or small horizontal steps - Answer-For cut slopes in soft rock, what specific
shape must the final slope have?
