HS&B Flashcards
According to commercial and industrial insulation standards, which of the following pipe insulation’s is suitable for use on hot water piping
Elastomeric plastic
The minimum bracing for a trench 6’ deep x 30” wide is?
4x4
Which type of material will increase in volume most when excavated from it’s compact state
Clay
Once wallpaper paste has been opened, it should be used within
1 day
Bridge concrete mix that contains super plasticizers will
Require less water for the same workability
Which of the following is a cause of concrete segregation
Excessive water to cement ratio
Caissons are
Shafts with or without casings sunk into the desired depth and filled with concrete
What is the temporary structure used to hold back a water while work is being done?
Coffer dam
An approach to a bridge requires a fill operation. Proper compaction of the fill soil is achieved by
Using the right amount of water
What is the color of deliniators installed on the left hand side of a one way road?
Yellow
Red is used as a background color on all of the following traffic signs except
One way
Highway warning signs will be placed in a highway construction site. The warning sign nearest the construction work site will be placed how many feet from the restrictions?
500’
Blue smoke rising from a batch of hot mix asphalt may indicate
Overheating
What is the difference between piers and pilasters used in masonry concrete?
Piers are isolated and freestanding whereas pilasters are built into a wall thickening a small wall section
Pile drivers may consist of a drop, mechanical, or _____ hammer
Vibratory
What are all of the tests that may be required in the project specifications for concrete quality control
Strength, slump, air
When super plasticizers are used in a concrete mix
Less water will be needed for the same workability
What does a standard Proctor test determine?
Optimum moisture content of a soil
What is the name for the pile that is formed by driving a casing into a set of depth and removing the casing while filling the hole with concrete?
Shell-less
What should be the minimum distance between the sash and the edge of the glass
1/16”
Why should an operator preheat the pump and nozzles on an asphalt distribution machine?
To match the asphalt temperature
What does a contour line grading plan indicate?
Location of constant elevation
A slurry wall is used for what purpose?
Sub-surface de-watering
According to OSHA, corrective action to eliminate existing and predictable hazards and unsanitary working conditions can be performed by
A competent person
Financial ratios make it possible for a company to
Compare a company’s performance with the average performance of businesses of similar age and size in the same industry
When an excavation is inspected by a competent person and evidence of a situation that could result in a possible cave in is found, OSHA requires that
Employees be removed from the excavation until the necessary precautions are taken
What do you do to increase the load capacity of a crane?
Increase the size of the counterweight
How often should wire rope be inspecting
After every use
What should be used to protect dry wall panels that meat on an outside corner
Corner bead
In obtaining proper soil compaction it is important to
Control the amount of water in the soil
What is the name used for the inside bottom elevation of the sewer pipe
Invert
What is used as a temporary set of walls to keep soil and or water from entering the excavation
Cofferdam
When preparing a road base, what soil reacts best to vibration?
Sand
What is the best foundation material for skyscrapers or large buildings
Bedrock
What device is bolted to the blade of a grader to help with grading a road around curbs
Curb shoe
Which is not one of the purposes of compacting soil
To decrease the resistance to erosion
How many layers of concrete or in a slump test?
3
What is a pile driven on an angle called?
Battered
What do you use to increase compression strength of concrete?
Vibration
A _____ Is used for a test to measure compression strength in concrete
Cylinder
Prefabricated forms are used to form 12” wide x 8’ high foundation walls. When should reinforcing steel be installed?
After the outside forms are in place
A contractor is placing a pipe in a 6 inch thick concrete slab. What is the maximum outside dimension of the pipe?
2”
Concrete strength is designated in pounds per square
Inch, compressive
Electrolysis would be caused by attaching which of the types of materials in direct contact with each other
Steel and copper
What best describes a pile driving head
A device placed on the head of a pile to receive hammer blows and to protect the pile from damage
Where should the rear tires be on a rubber tire backhoe after stabilizers are placed?
As high as the stabilizers will lift them
Which is not a basic test used in concrete mix design as quality control
Density
Which of the following ad mixtures is commonly used to improve the durability of concrete?
Natural pozzolans
Which of the following is a cause of concrete segregation in bridge abutments?
Excessive water to cement ratio
You can increase concrete set up time and excellerate early strength development by adding
Calcium chloride
What is the name for an aggregate emulsified asphalt finish used to rejuvenate and seal an old asphalt surface?
Slurry seal
Piles are specified for a new bridge. What action drives a single action pile driving hammer?
They fall by gravity
Toe boards are required for protection from falling objects on scaffolds used to construct bridge falsework. According to OSHA, what is the required minimum height of the toeboard’s?
4”
What are the purpose is for laying down a prime coat?
To protect the base course against weather, to prevent a slip plane between the base and surface course, and To prevent the base materials from shifting under traffic before the first course is placed
Air entrainment in concrete is used primarily to
Improve freeze/thaw resistance
Which of the following types of Portland cement Is used in massive concrete structures where low heat of hydration is required
IV
What does the structural steel designation C 3 x 6 mean?
Channel 3” deep, 6# per linear foot
Corrugated metal pipe is used as a part of a drainage system. Which is used to join CMP?
Band and collars
What is true about a fiber tubular column? (Sonotube forms)
With proper care they are reusable
According to OSHA, a scaffold with a horizontal dimension less than 45 inches in either direction shall have standard guard rails on all sides and ends if it is over what minimum length?
12’
All of the following will affect the load capacity of a mobile crane
Hydraulic pressure limits, the quadrant in which it is working, and the boom angle
Lime is an affective stabilizing agent for
Expansive clay
According to design in control of concrete mixturess, air entrained concrete is mainly used to
Reduce damage by freeze/thaw cycles
Which of the following drawings is done on graph paper and shows natural ground, finish grade, gutter flow lines, and sewer and drainage line
Profile sheet
What is meant by a road “super”?
Continuous slope
A pile head is usually used when piles are driven. What can be substituted for the driving head?
Pile ring
What is the shape of a permanent highway warning sign?
Diamond
What is the difference between using an official car and a pilot car for one-way traffic control during highway construction?
An official car follows the last car and a pilot car leads a line of cars
When delineators are used to outline the required vehicle pass through a highway construction site, the reflective unit should be placed a minimum of _____ inches above the roadway
48”
Which of the following describes a test that measures concrete consistency?
Slump
Which of the following is not a pre-draining de-watering system
Slump hole
What is soil distress when you are performing benching work in a confined space?
Cave in imminent or likely to occur
Which of the following has the least impact on the success of compaction of a new asphalt pavement service?
Environmental conditions
What is not an advantage of using rip rap for channel walls?
Uplift protection
Safety nets which are to be used during construction shall extend beyond the edge of working surface, according to OSHA, by ____ feet
8
Leveling nuts securing a bridge column bearing plate are tightened and adjusted. What is the final operation performed for bearing support?
Grout with non-shrink grout
Horizontal members on the outside of pre-fabricated forms used to straighten align forms are called
Walers
A bridge deck is prepared for an asphalt overlay, what can be the result of an excess application of tack material
Asphalt slip
Damping of the subgrade prior to placement of concrete will
Prepare rapid water extraction of the mixing water from the concrete
When tying reinforcing steel, a saddle or butterfly tie is used:
Where the reinforcing bars cross each other
In addition to providing freeze/thaw resistance, air entrainment will also improve the _____
Workability
According to the design control and concrete mixture, after 300 drum revolutions or ___ hours, structural concrete shall be rejected
1-1/2
Structural concrete slabs, columns and other members should be protected ____ percent of their design strength
70%
The datum point, property lines, read lines, and utility easements or shown on the _______ plan
Plot
The most common gauge of tie wire are used in the installation of reinforcing steel is ____ gauge
16 gauge
As concrete sets, water will rise to the top, this is known as
Bleed
In comparing normal concrete to high early concrete (type III), how much do you reduce the curing time for high early?
4 days
The largest size of standard size rebar that can be lapped spliced is
11
When using a vibratory roller, if rippling occurs what should you do?
Increase frequency
What components make up a screed?
Screed plate and adjusters with vibration bars
When laying asphalt uphill, the breakdown roller (drive roller) should travel
Up hill behind the paver
What is the minimum distance for posting construction signs on a construction site?
1500’
On a concrete highway project using a train slip form paver, the slump should be
Less than 1
Corrugated metal pipe (draw pipe) comes in what multiple lengths?
2
You are placing concrete culverts and you know that problems will occur with the joints. To prevent this you should:
Place concrete embankments on the ends
What type of pile has the most friction?
Wood
Where is the Arrow Panel set?
Before the channelization
What is a cofferdam used for?
Temporarily hold back dirt and water
What part of a headwall directs the flow of water?
Wing wall
What is not used for the down stroke of a hammer on a pile driver?
Gasoline
What is used to guide a pile?
Leads
What protects the top of a pile while driving?
Cushion
What type of hammer drives piles the fastest?
Vibratory
A pile that is driven into the ground and leaves the shell or casing is called what?
Shell
What type of pile is enlarged on the end in order to provide a larger bearing area?
Bell pile
What piledriving operation uses high water pressure?
Jetting
What is the most commonly used type of equipment to drive a pile?
Hydraulic
What is the upper part of a pile called after it was driven?
Head
Wide flange beams driven vertically to retain material are known as
Soldier beams
What powers a single action pile driver?
Gravity
What can be used to drive a pile in place of a cushion?
Ring collar
Two scrapers are being operated as a team for a highway excavation. The scrapers are equipped with bumpers and bales and each can provide power to help the other load. This type of operation has been described as
Push pull
A scraper capable of operating by it’s self is known as a
Elevating
What does grade 40 on a piece of re-bar mean?
40,000 pounds per square inch tensile
A stable mix of asphalt, cement, water, and soap is
Emulsified asphalt
Asphalt compaction using a roller should begin:
When there is no undue lateral movement of the asphalt under the roller
Freshly paved asphalt can be opened to vehicular traffic:
As soon as the final rolling is complete
How do paving machine’s maintain crowned services?
The screed plate and tamping bar are hinged in the center
Movement of the soil on a wet section of road caused by equipment is called
Pumping
The most common bituminous paving materials in use today are
Petroleum asphalts
The setting of a floating screed for the desired asphalt depth is called
Leveling
The solvent usually used for medium - cure liquid asphalt is:
Naphtha
