NICET Highway Construction Level 2 complete guide 2024, Exams of Construction

Download NICET Highway Construction Level 2 complete guide 2024 and more Exams Construction in PDF only on Docsity! NICET Highway Construction Level 2 complete guide 2024 What are the 5 types of bridge abutments? Closed Abutment, Stub or Perched Abutment, Pedestal or Spill-through Abutment, Integral End Bents, Mechanically Stabilized Abutment What is a "closed abutment"? A closed abutment is a full-height wall with wing walls on each side that retains the full height of the approach embankment. This type of abutment minimizes the required span length of the bridge. What is a stub or perched abutment? A stub or perched abutment is a relatively short abutment that is constructed after the embankment has been completed. The embankment can be compacted without interference from the abutment. What are Pedestal or spill-through abutments? Pedestal or spill-through abutments are short stub-type abutments supported on pedestals or columns extending to the natural ground. As with closed abutments, the abutment must be constructed before the approach embankment. What are Integral End Bents? Integral end bents are stub abutments that are rigidly connected to the superstructure without expansion joints. The connection is designed for full transfer of thermal stresses from the bridge deck to the abutment. What is a Mechanically Stabilized Abutment? Mechanically stabilized walls, also have been used to support bridge abutments. The bridge seat and footing are supported directly on the reinforced backfill. What is a bridge abutment? A bridge abutment is a substructure that supports one terminus of the superstructure of a bridge and, at the same time, laterally supports the embankment which serves as an approach to the bridge. On a rural highway, the construction sign should be placed how far away from the pavement? 6 to 12 feet When casting concrete cylinders, the cylinders shall be fabricated within how many minutes of sampling? 3 minutes What apparatus is required when using a standard method to determine air content by volumetric method? A mallet, a hemispherical tipped tamping rod and a syringe. The sealer for protective treatment of concrete pavement can be applied with no harmful effect even if the concrete is: Still green. How much weight should safety railing support? 200 lbs in any direction. How thick must top rails and mid rails be on guardrail? At least 1/4" thick According to OSHA requirements, how far above the walking surface does a top rail on a guardrail have to be? False. Perpendicular. In asphalt construction, it is most difficult to obtain a representative test sample from? Open graded. Trees to be saved within the R-O-W should be marked by? The Construction Engineer. Grubbing includes? Removal of stumps, roots and stubs. Before beginning earthwork, it is important to? Verify location of underground utilities through local one call system. When backfilling culverts and storm drains, lifts are not to exceed? 6 inches. Backfill for pipes and culverts consist of? Granular materials. For fences erected on a slope, the posts are to be set in what position? Plumb Plans required a 42" high fence. If the posts are 6' long, how much of the post is in the ground? 6' x 12 = 72 72" - 42" = 30" Fence corners are strengthened by? Horizontal post and tension wire. What is important when inspecting concrete barrier? Alignment Guardrail is 25' long. What is the center spacing of the posts if mounted on 8 posts? 8 posts means 7 spaces. 25' / 7 = 3.57' A girder measures 100' by 36" with flanges 12" wide. What is the surface area of the girder to the nearest SF? 100' x 3' x 2 sides = 600 SF 12" x 2 (top and bottom) x 100' x 2 Flanges = 400 SF Total - 1000 SF Paint weighs 20lbs per gallon. If a bridge requires 200 lbs of paint and so far only 125 lbs of paint has been applied, what is the percentage completed? 125 divided by 200 = .625 (or 62.5% complete) What is the protective surface treatment for a concrete bridge deck? White membrane curing compound. What is the purpose of using vibrators in concrete? Consolidation Sealer treatment can be applied without being hard, even if the concrete is? Still green Excessive vibration of concrete causing the top to become white, chalky and non durable is called? Laitance The main reason for applying liquid membrane forming compound on concrete is? Preventing loss of water during early curing. The main reason for white reflective concrete covering is? Reduce temperature in concrete and reflect the sun's heat. What does a screed do? Removes excess concrete from the surface of freshly placed concrete. If told in the above problem the specifications requires a 30% increase in the quantity for the protective coating, how many gallons are required? 84.4 gallons x 1.30 = 109.75 gallons Concrete pipe should be placed? With the bell end of the pipe at the upstream end. When installing concrete pipe, install? Downstream to upstream. A culvert is labeled CMPA. What does CMPA stand for? Corrugated Metal Pipe Arch Culvert Why is it important to keep trench width consistent with the specs? Larger trench widths increase cost. A pipe's invert elevation at the inlet is 153.5. A 100 ft run of pipe is to be installed at a -2.0% grade. What is the elevation at the end of the pipe run? 100 x 0.02 = 2' 153.5 - 2.0 = 151.5' What are the ACI testing procedures? Temp, Air by Volumetric method, Air Content by Pressure method, Slump, Unit Weight and Cylinders. Sum four distances: 66 ft + 6.600 ft + 66 inches + 6.6 inches 78.65 fT What does the letter "D" mean if referring to the alignment of a road? Degree of curvature. Regulatory Traffic Signs are typically? Black letters on white background. The sides of trenches need to be shored, braced or sloped if the excavation exceeds? 5 feet The contractor is responsible for which OSHA requirements? How many times do you rod each layer of concrete during a slump test? 25 times True or false: You should not tap the side of the cone after each layer of concrete during a slump test? True The maximum allowable time between obtaining the first and final portions of a composite sample is minutes 15 After all concrete samples have been transported to the place where tests are to be performed; the samples must be and with a to ensure uniformity combined, remixed, shovel To protect concrete from contamination or an absorptive subgrade when being discharged from a paving mixer, three shallow pans may be placed on the subgrade to collect the samples. True or False True The sample shall be when the concrete contains aggregate larger than that appropriate for the molds or equipment. wet-sieved The temperature measuring device may be removed from the concrete for reading. True or False False Report the slump to the nearest inch .25 Wet sieving is permitted when using density method. True or False True The tamping rod length must be at least inches greater than the depth of the mold being used but not greater than inches 4, 24 The required frequency of the vibrator used in the density test method is at least vibrations per minute 9000 If rodding is the method of concrete consolidation, the measure must be filled in approximately equal layers 3 Adjustments to the level of concrete is permitted after consolidation but must be made prior to - . Striking-off After strike-off, all excess concrete must be removed from the exterior of the bowl before weighing. True or False True Air content by the pressure method determines the air content from an observation of the change in of concrete with a change in . volume, pressure If a vibrator is used for consolidation it must conform to ASTM and have a frequency of at least 9000 vibrations per minute. C192 If the concrete to be tested contains aggregate retained on the inch sieve, the sample must be wet-sieved over the inch sieve prior to testing. 2, 1.5 When placing concrete in a beam mold, either a scoop or shovel is permitted. True or False True When molding 4 x 8 cylinders by rodding or vibration, the concrete is placed into the cylinders in equal layers 2 Strike-off the concrete surface of cylinders using the or a handheld or trowel to produce an even surface that has no depressions or projections larger than inch tamping rod, float, 1/8 For beams, if the NMAS is greater than 2 inches, wet sieving over the 2 inch sieve is required. True or False True When internal vibration is used to consolidate a standard flexural strength test specimen, the mold is filled in layer with a vibrator inserted at intervals not exceeding along the centerline of the beam 1,6 What does AASHTO stand for? American Association of State Highway and Transportation Officials What does AASHTO do? AASHTO is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. What does ASTM stand for? American Society for Testing and Materials What does ASTM do? ASTM develops and publishes technical standards for many different industries with the goal of enhancing performance and safety over a wide range of products, materials, systems, and services. In which ASTM do you find specifics for concrete slump testing? ASTM C 143 A "rolling straight-edge" is an instrument used to measure the surface regularity of roads and similar structures such as airport runways. The unit detects, registers and logs results of high and low areas that need to be ground or re-rolled. True or False? When pouring concrete curb, the longer saw cutting joints is delayed, the higher the probability there is for cracking. True True or False? Joint spacing that is greater than 10 feet requires the use of load transfer devices. False. Greater than 15 feet. How far back from a trench edge should you keep excavated soil (spoils) and other material? 2 Feet What is the standard size of an R1-1 Stop sign? 30 inches x 30 inches for single lane conventional highways and 36 inches x 36 inches for multi- lane conventional highways. The 24 inches x 24 inches size shall only be used for alleys with restrictive physical conditions and vehicle usage that prohibits the installation of the standard size R1-1. Tests for temperature, slump and air content shall be started within how many minutes after obtaining the final portion of the composite sample? 5 Minutes T/F To protect concrete from contamination or from an absorptive subgrade when being discharged for a paving mixer, 3 shallow pans may be placed on the subgrade to collect samples. True T/F If needed, the rate of concrete discharge may be regulated by adjusting the size of the gate opening. False ASTM C 1064 is used to verify what? Conformance with concrete specifications. Concrete containing aggregate with a nominal maximum aggregate size greater than 3 inches may require up to how many minutes before the temperature stabilizes after mixing? 20 minutes What is the temperature range that a concrete temperature measuring device must be capable of? 30-120 degrees Fahrenheit How often must a concrete temperature measuring device be calibrated? Annually (or whenever there is a question of accuracy) Concrete reference thermometers must be accurate and readable to plus or minus how many degrees? + or - 0.5 Leave the concrete temperature measuring device in the concrete for at least minutes but not more than minutes before reading. 2 , 5 The concrete slump test is applicable to concrete with a max aggregate size of inches. If the concrete contains aggregate larger than inches, wet sieve over the inch sieve. 1.5, 1.5, 1.5 After rodding each layer of concrete, tap the sides of the measuring container using a mallet how many times to close the voids left by the tamping rod? 10-15 times What is the nominal diameter of #6 rebar? .75 inches How many acres in one square mile? 640 Acres What is the standard minimum height of both Type 1 and Type 2 construction barricades? 3 Feet The invert of a sewer pipe refers to what? Inner bottom. Steel is galvanized by coating it with what? Zinc Which type of soil do well points operate most efficiently in? Sand A bag of cement weighs MOST NEARLY pounds. 94 lbs What is a monolithic sewer? Reinforced concrete cast in place sewer. What is the ideal compaction range for newly paved asphalt? Typically between 92%- 98% of the theoretical density When a lane is closed on a multi-lane road for other than a mobile operation, a transition area containing which type of taper is used? A merging taper. What is the longest type of traffic taper? Merging taper. It requires the longest distance Which type of taper is used when merging is not required, but a lateral shift is needed? A shifting taper. What should the length of a shifting taper be? Approximately 0.5 L What should the length of a shoulder taper be? Approximately 0.33 L What is the recommended advance warning sign minimum spacing for work zones on Urban (high speed) roadways?