New Mexico CID GS-4 Concrete, Cement, Walkways and Driveways Examination

A private driveway slab measures 20 feet by 40 feet and is 4 inches thick. How many cubic yards of concrete are required, with no waste allowance?

• A6.0 cubic yards
• B8.9 cubic yards
• C9.9 cubic yards
• D13.3 cubic yards

One cubic yard of concrete placed 4 inches thick covers 81 square feet. How many cubic yards are needed for 486 square feet of 4-inch walkway, with no waste?

• A4.0 cubic yards
• B5.0 cubic yards
• C6.0 cubic yards
• D8.0 cubic yards

A site plan is drawn at a scale of 1/4 inch = 1 foot 0 inches. A walkway measures 3-1/2 inches on the drawing. What is the actual length?

• A7 feet
• B10 feet 6 inches
• C14 feet
• D28 feet

A driveway is 12 feet wide, 50 feet long, and 5 inches thick. If the estimator adds 8 percent waste, how many cubic yards should be ordered?

• A8.6 cubic yards
• B9.3 cubic yards
• C10.0 cubic yards
• D11.1 cubic yards

Estimate net concrete for an 80-foot walk that is 5 feet wide and 4 inches thick, plus two landings that are each 5 feet by 5 feet and 6 inches thick. Ignore waste.

• A4.9 cubic yards
• B5.4 cubic yards
• C5.9 cubic yards
• D7.4 cubic yards

A civil grading plan uses a scale of 1 inch = 20 feet. A proposed driveway measures 3.25 inches on the plan. What field length should be laid out?

• A32.5 feet
• B48.8 feet
• C65.0 feet
• D80.0 feet

A rebar takeoff lists 24 pieces of No. 4 bar, each 20 feet long. Using 0.668 pounds per foot for No. 4 bar, what is the mill weight?

• A160 pounds
• B241 pounds
• C321 pounds
• D481 pounds

Under New Mexico Construction Industries rules, which adopted code pair applies to a GS-4 contractor placing a residential garage slab versus a commercial building slab?

• ANMAC 14.7.2 (2021 IRC) for both occupancies
• BNMAC 14.7.3 (2021 IBC) for dwellings and NMAC 14.7.2 (2021 IRC) for commercial
• CNMAC 14.7.3 (2021 New Mexico Residential Building Code / IRC) for the dwelling garage and…
• DOnly ACI 318; NMAC does not adopt IBC or IRC

A 30-foot by 40-foot pad has an existing grade of 102.4 feet and a proposed subgrade of 101.1 feet. Assuming a level cut over the whole pad, how many cubic yards of excavation are required?

• A44.4 cubic yards
• B52.0 cubic yards
• C57.8 cubic yards
• D75.1 cubic yards

How many cubic feet are in one cubic yard of concrete?

• A9 cubic feet
• B27 cubic feet
• C36 cubic feet
• D81 cubic feet

A patio is 18 feet by 30 feet and 4-1/2 inches thick. What is the net concrete volume?

• A5.0 cubic yards
• B6.0 cubic yards
• C7.5 cubic yards
• D9.0 cubic yards

A specification calls for a 6-sack mix. How many 94-pound sacks of portland cement are required for 9 cubic yards, and what is the cement weight?

• A42 sacks and 3,948 pounds
• B48 sacks and 4,512 pounds
• C54 sacks and 5,076 pounds
• D60 sacks and 5,640 pounds

Per NMAC 14.6.6, a GS-4 Concrete, Cement, Walkways and Driveways licensee may install curbs, gutters, sidewalks, and driveway culverts in which location?

• AAnywhere in New Mexico, including public rights-of-way, under the GS-4 license alone
• BOn private property; work in public rights-of-way is not allowed unless subcontracted to…
• COnly inside buildings, not as exterior flatwork
• DOnly on NMDOT highway projects

A driveway is to fall 9 inches over a 36-foot run. What is the slope?

• A1.0 percent (1/8 inch per foot)
• B1.5 percent
• C2.1 percent (1/4 inch per foot)
• D6.0 percent

Estimate net concrete for 80 linear feet of 5-foot-wide, 4-inch sidewalk plus 80 linear feet of separate 6-inch-wide by 18-inch-high curb (the curb is not part of the sidewalk section).

• A4.9 cubic yards
• B6.1 cubic yards
• C7.2 cubic yards
• D9.4 cubic yards

On a grading plan, contour lines that are drawn very close together indicate which site condition?

• AA nearly level area
• BA steep slope
• CA property-line easement
• DThe location of a proposed control joint

A walkway runs from station 12+40 to station 15+20, is 5 feet wide, and is 4 inches thick. What is the net concrete volume?

• A10.4 cubic yards
• B14.8 cubic yards
• C17.3 cubic yards
• D20.7 cubic yards

Which layout method is used to square a driveway corner from a building line?

• AA 2-3-4 triangle
• BA 3-4-5 right triangle
• CA 5-6-7 triangle
• DEqual diagonal offsets without measuring the sides

Per OSHA 1926 Subpart P Appendix B, what is the maximum allowable slope for a simple slope excavation less than 20 feet deep in Type C soil?

• AVertical (90 degrees)
• B3/4 horizontal to 1 vertical (53 degrees)
• C1 horizontal to 1 vertical (45 degrees)
• D1-1/2 horizontal to 1 vertical (34 degrees)

Per OSHA 1926 Subpart P Appendix B, the maximum allowable simple slope in Type B soil for an excavation less than 20 feet deep is:

• A1/2:1 (63 degrees)
• B3/4:1 (53 degrees)
• C1:1 (45 degrees)
• D1½:1 (34 degrees)

Per OSHA 1926 Subpart P Appendix B, the maximum allowable simple slope in Type A soil for an excavation less than 20 feet deep (not short-term) is:

• AVertical
• B3/4 horizontal to 1 vertical (53 degrees)
• C1:1 (45 degrees)
• D1½:1 (34 degrees)

A 2-foot-wide utility trench for a driveway culvert is 6 feet deep in Type C soil and will be sloped as a simple slope per OSHA Appendix B. What total top width is required?

• A8 feet
• B11 feet
• C14 feet
• D20 feet

Per OSHA 1926.651(j)(2), excavated material and equipment shall be kept at least how far from the edge of an excavation unless a retaining device is used?

• A1 foot
• B2 feet
• C4 feet
• D6 feet

Per OSHA 1926.651(k), daily inspections of excavations, adjacent areas, and protective systems shall be performed by:

• AAny laborer on the crew
• BThe ready-mix driver
• CA competent person, before the shift and as needed after rainstorms or other hazard-incre…
• DThe building official only

Per OSHA 1926.652(a), each employee in an excavation shall be protected from cave-ins by an adequate protective system unless the excavation is in stable rock or:

• AIt is less than 5 feet deep and a competent person finds no indication of a potential cav…
• BIt is less than 8 feet deep in any soil
• CIt is less than 4 feet deep, with no competent-person review required
• DThe work will last less than one hour

Per OSHA 1926.651(c)(2), a stairway, ladder, ramp, or other safe means of egress is required in trench excavations that are 4 feet or more in depth so that no employee has more than how much lateral travel?

• A15 feet
• B25 feet
• C50 feet
• D100 feet

Per OSHA soil classification, a cohesive soil with unconfined compressive strength of 1.6 tsf cannot be classified as Type A if which condition exists?

• AThe soil is clay or silty clay
• BThe soil has been previously disturbed, is fissured, is subject to vibration, or has wate…
• CA pocket penetrometer was used
• DThe excavation is less than 5 feet deep

In the OSHA thumb-penetration test, a soil that can be penetrated the full length of the thumb is most likely:

• AStable rock
• BType A
• CType B
• DType C

Before excavating for a driveway culvert or thickened slab edge, the contractor should request underground utility locates by calling:

• A911
• B411
• C811
• DThe ready-mix plant

Before placing a sidewalk or driveway slab, the subgrade should be prepared by:

• ALeaving topsoil and roots in place to cushion the slab
• BRemoving organic material and compacting the subgrade (and any specified base) to a unifo…
• CSoaking the subgrade until it is muddy so the slab will bond
• DPlacing the concrete on frozen ground and letting it thaw later

Per IRC 2021 Section R401.3, lots shall be graded so the grade falls at least which amount away from foundation walls, and impervious surfaces within 10 feet of the foundation shall slope at least how much?

• A2 inches in the first 10 feet; 1 percent
• B4 inches in the first 10 feet; 1 percent
• C6 inches in the first 10 feet; 2 percent away from the building
• D12 inches in the first 10 feet; 5 percent

Batter boards are used during layout primarily to:

• AMeasure slump at the chute
• BHold string lines that preserve building lines and grade after corner stakes are removed…
• CSupport welded-wire reinforcement during the pour
• DBrace wall forms above 8 feet

IRC 2021 Section R403.1 requires concrete footings to be supported on:

• AFrozen soil, provided the pour is completed the same day
• BUndisturbed natural soils or engineered fill
• CLoose backfill from the previous day's excavation
• DA layer of topsoil for drainage

Per OSHA Appendix A, Type C soil includes cohesive soil with unconfined compressive strength of 0.5 tsf or less and which of the following?

• AIntact hard clay that is not fissured
• BAngular gravel classified as Type B
• CGranular soils such as gravel, sand, and loamy sand; submerged soil; and soil from which…
• DStable rock

Proof-rolling a driveway subgrade is performed to:

• AMeasure slump before the truck leaves
• BDetect soft, pumping, or yielding areas so they can be undercut and recompacted before co…
• CReplace the need for isolation joints
• DCure the slab by densifying the surface

The most reliable starting points for laying out a residential driveway are:

• AThe approximate location of the mailbox
• BEstablished property corners, building lines, or survey control shown on the approved plan
• CThe ready-mix driver's judgment from the street
• DThe previous contractor's leftover form stakes, without checking the plan

When a trench box (shield) is used for a driveway-culvert excavation, which statement is correct?

• AEmployees may work outside the shield at the same depth as the box
• BThe shield protects employees inside it from cave-ins; it is not designed as a sloping sy…
• CA trench box eliminates the need for a means of egress
• DBenching is the preferred OSHA system in Type C soil instead of a box

Per OSHA 1926.703(a)(1), formwork shall be designed, fabricated, erected, supported, braced, and maintained so that it can support without failure:

• AOnly the weight of the carpenters
• BAll vertical and lateral loads that may reasonably be anticipated
• CWind load only
• DThe 28-day design live load of the finished building

ACI 347 formwork design commonly takes the unit weight of ordinary fresh concrete as:

• A90 pounds per cubic foot
• B120 pounds per cubic foot
• C150 pounds per cubic foot
• D200 pounds per cubic foot

ACI 347 specifies a minimum construction live load on formwork of 50 pounds per square foot for ordinary operations. That minimum increases to 75 pounds per square foot when:

• AThe air temperature is below 40°F
• BMotorized concrete buggies or similar equipment will run on the formwork
• CThe slab is less than 4 inches thick
• DOnly hand tools will be used

A wall form is filled with ordinary fresh concrete to a 5-foot fluid head. Using the full hydrostatic pressure p = 150 pounds per cubic foot × h, what lateral pressure acts at the bottom of the form?

• A150 pounds per square foot
• B375 pounds per square foot
• C600 pounds per square foot
• D750 pounds per square foot

A form-release agent (form oil) is applied to:

• AThe reinforcing bars so they slide during thermal movement
• BThe contact face of the form so the concrete does not bond and the form strips cleanly
• CThe subgrade to waterproof the slab
• DThe finished broom surface as a cure

Chamfer strips placed in the corners of forms are used to:

• AIncrease slump at the edges
• BCreate a beveled edge that is less likely to spall and is easier to strip
• CReplace the need for reinforcement at corners
• DAct as isolation joint filler

In a wall-form system, what is the primary function of snap ties, walers, and strongbacks?

• ASnap ties resist the bursting (lateral) pressure and set wall thickness; walers distribut…
• BSnap ties are only decorative; walers carry all gravity load of the wall; strongbacks rep…
• CAll three are interchangeable names for the same vertical stud
• DThey replace the need to brace the form against wind and construction loads

Immediately before a sidewalk or curb pour, forms should be checked for:

• AColor of the form oil only
• BAlignment, grade, tightness of joints, staking/bracing, and cleanliness
• CThe 28-day cylinder break from a previous job
• DWhether the truck mixer has a current CDL

ACI 347 recommended minimum times allow wall and column side forms to be removed after about 12 hours when:

• AThe concrete has been in the form for any 12 hours, even if it is still plastic
• BThe concrete has hardened sufficiently to resist damage from stripping, typically using T…
• CThe air temperature is below freezing, because cold concrete strips easier
• DNo shores are present, regardless of concrete strength