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concrete 32-62

concrete 32-62
30問 • 2023-09-08
  • David Bobadilla
    • 通報

    scaffold quiz

    scaffold quiz

    David Bobadilla · 13問 · 3年前

    scaffold quiz

    scaffold quiz

    13問 • 3年前
    David Bobadilla

    concrete test #1

    concrete test #1

    David Bobadilla · 13問 · 3年前

    concrete test #1

    concrete test #1

    13問 • 3年前
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    Slope test

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    David Bobadilla · 7問 · 3年前

    Slope test

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    7問 • 3年前
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    structure test

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    David Bobadilla · 13問 · 3年前

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    13問 • 3年前
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    Doors/windows

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    David Bobadilla · 13問 · 3年前

    Doors/windows

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    13問 • 3年前
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    David Bobadilla · 7問 · 3年前

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    7問 • 3年前
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    David Bobadilla · 12問 · 3年前

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    12問 • 3年前
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    David Bobadilla · 5問 · 3年前

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    5問 • 3年前
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    David Bobadilla · 9問 · 3年前

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    9問 • 3年前
    David Bobadilla

    Framing

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    David Bobadilla · 9問 · 3年前

    Framing

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    9問 • 3年前
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    David Bobadilla · 15問 · 3年前

    steel

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    15問 • 3年前
    David Bobadilla

    1 hard questions

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    David Bobadilla · 26問 · 3年前

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    concrete 1-31

    David Bobadilla · 31問 · 3年前

    concrete 1-31

    concrete 1-31

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    David Bobadilla

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    concrete 63-93

    David Bobadilla · 31問 · 3年前

    concrete 63-93

    concrete 63-93

    31問 • 3年前
    David Bobadilla

    concrete 93-127

    concrete 93-127

    David Bobadilla · 34問 · 3年前

    concrete 93-127

    concrete 93-127

    34問 • 3年前
    David Bobadilla

    問題一覧

  • 1

    Why is the sub-grade and forms dampened prior to placement of the concrete:

    prevent extraction of hydration water

  • 2

    Concrete slabs should be placed with what slump:

    2-4

  • 3

    What is the maximum length of a safety lanyard:

    6’

  • 4

    What of the following is acceptable for rebar:

    rust

  • 5

    OSHA requires what minimum overlap for planking on a scaffold:

    12”

  • 6

    What tie would be used to hold rebar in place for a vertical wall pour:

    tie wire

  • 7

    What is the minimum depth of a footer placed in undisturbed soil not exposed to bad weather:

    12”

  • 8

    OSHA requires cave-in protection for trenches at what minimum depth:

    5 feet

  • 9

    Form lateral pressures increase by what percentage if a concrete blend has 70% slag or 40% fly ash:

    40%

  • 10

    What is the best way to compact sandy soils:

    controlling the water content and with water

  • 11

    If the ground slopes 10 feet between a marker at 75 feet to another marker at 125 feet, what is the total slope:

    20%

  • 12

    What admix is used with concrete being placed in very hot weather:

    retarder

  • 13

    What is the minimum cover for rebar from the surface of a mat:

    1”

  • 14

    From the initial mixing of concrete to the actual pour, ASTM 94 requires what maximum amount of time:

    1 1/2 hours

  • 15

    If you have an excavation with a rod reading of 94 and the backsite to the trench is (100') with an elevation of 4.7 what does the stake read:

    10.7

  • 16

    Footings shall be how many inches wider than the wall it supports for residential construction:

    8"

  • 17

    A simple way to kno when to continue concrete finishing after waiting for the bleed water to evaporate is to step on the concrete leaving an indentation of less than:

    1/4"

  • 18

    What is the best form for a heavy concrete column:

    locking column clamp

  • 19

    What is the minimum depth of a footer placed in undisturbed soil not exposed to bad weather:

    12”

  • 20

    What admix is added to the concrete batch to create high early concrete:

    accelerator

  • 21

    If you intend to resuse plywood form material which of the following would be used:

    exterior grade

  • 22

    Typically a joist chair holds how many rebar:

    2

  • 23

    What concrete finish is provided for exposed architectural concrete:

    class 1 (I)

  • 24

    What must be provided someone operating a grinder that is classified as hazardous work:

    full face shield

  • 25

    What should be applied to form wood to ease removal:

    release agent

  • 26

    What is the maximum height from which concrete should be dropped from the chute:

    5’

  • 27

    How many days should new concrete vure before adding waterproofing materials to the concrete:

    7

  • 28

    Dirt from excavations must be set back how far from edge of the trench:

    2’

  • 29

    Air entertainment improves freeze and thaw resistance and what else:

    workability

  • 30

    In a working trench with very unstable ground, what device provides the greatest worker safety:

    trench box