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020302 > O20302bAB - Wall And Column Forming > Flashcards

O20302bAB - Wall And Column Forming Flashcards

1
Q

If the temperature is low during the placement of concrete, what effect will this have on the forms?

A

Lateral pressures will last longer.

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2
Q

What kind of pressure does freshly poured concrete exert on column forms?

A

Lateral pressure

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3
Q

What is the name of the force that tends to twist an object?

A

Torsion

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4
Q

Lateral concrete pressure exerted on formwork is a type of _______ pressure.

A

Hydrostatic

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5
Q

The higher the slump the greater the lateral pressure. T or F

A

T

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6
Q

What happens when hydrostatic pressure is high in concrete?

A

There is more strain on the forms

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7
Q

Which type of tie makes use of a form clamp on one end and a special tightening wrench on the other end?

A

Pencil Rod tie

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8
Q

What size of hole is needed in form plywood to accommodate snap ties?

A

Large enough to allow the end button to pass through.

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9
Q

What are bucks as found in concrete forms?

A

They form openings in the concrete.

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10
Q

For short radius curve forms, which method should be considered, other than making saw kerfs in thicker sheets of plywood?

A

Use two or more layers of thinner sheets

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11
Q

When are core forms filled with concrete?

A

At the same time as columns.

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12
Q

What are the three main objectives of good formwork?

A

Quality
Safety
Economy

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13
Q

What is the difference between dead and live loads?

A

Dead loads are comprised of the weights of all materials related to the permanent structure. Live loads relate to the weighs, forces and pressures from objects which are not permanent.

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14
Q

What two major factors does the amount of hydrostatic pressure depend on?

A

The height/depth of fluid and the mass or unit weight of the fluid.

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15
Q

What is the name of the force that tends to twist an object?

A

Torsion

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16
Q

What is the force exerted on vertical formwork by the placement of fluid concrete called?

A

Lateral concrete pressure

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17
Q

Which factor has the greatest effect on lateral concrete pressure?

A

Rate of placement

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18
Q

In which season, summer or winter, does more form failures occur and why?

A

Winter. Cold temperatures slow the rate of hydration, and the concrete acts like a fluid longer, thereby increasing lateral pressure.

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19
Q

Define rate of placement.

A

Average rate of rise of the fresh concrete in the forms per hour.

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20
Q

How does the thickness of a wall form affect lateral concrete pressure?

A

It has nothing to do with lateral concrete pressure.

21
Q

What is deflection as it relates to formwork?

A

Deflection is a measure of the bending of any form component that occurs under load.

22
Q

What effect does larger coarse aggregate have on lateral concrete pressure?

A

Larger coarse aggregate causes the concrete to act less like a fluid and therefore reduces pressures.

23
Q

When using plywood as a form surface, which direction should the face grain be in?

A

The face grain should always be at right angles to the first system of support.

24
Q

List two functions a snap tie performs.

A

Hold the wall forms apart at a specific wall thickness.

Hold the two sides together opposing lateral concrete pressures.

25
Q

What is the function of a break back on a snap tie?

A

The breakback is a weakened section of the tie where it is designed to snap off.

26
Q

Why should steel wedges be installed on a slight angle and nailed with double-headed nails to either the walers or strongbacks?

A

Putting the wedges on an angle increases the bearing area and the nails prevent the wedges from being dislodged during the placement of concrete.

27
Q

What is the disadvantage of using pencil rod ties?

A

The protruding steel rod is not removable or does not break off inside the concrete, potential rust.

28
Q

When using coil ties, what penetration of the coil bolt is recommended?

A

The coil bolt should penetrate completely through the coil segment of the tie and at least one bolt diameter past.

29
Q

Joints in adjacent walers should not occur within _____.

A

1 tie spacing

30
Q

Each waler should be supported by at least _____.

A

2 wedges

31
Q

Joints in adjacent walers should be offset _____.

A

Atleast to wedge spaces.

32
Q

Joints in adjacent rows of walers should be offset ______.

A

As much as possible.

33
Q

What area of formwork is supported by one tie?

A

An area equal to the vertical tie spacing multiplied by the horizontal tie spacing.

34
Q

Under what conditions might a grade strip be used to establish the pour height on a wall form?

A

If a straight clean line at the horizontal construction joint is required.

35
Q

What is a control joint in a wall?

A

A control joint is a designed weakened section of a wall ensuring the wall will crack in a predetermined location.

36
Q

Why are wall bucks made slightly thinner than the actual wall thickness?

A

To make buttoning up or closing-up the wall forms easier.

37
Q

To allow for mechanical services to pass through a wall, small openings are formed by using _____.

A

Sleeves

38
Q

A recess formed into a wall is called a ______.

A

Box-out

39
Q

Devices surrounding a column form to resist concrete pressures are called ______ or ______.

A

Yokes or collars

40
Q

A column form that is battered or has a tapered face has to be built to resist _____.

A

Uplift

41
Q

Why are column forms usually subject to higher concrete pressures than wall forms?

A

Concrete columns usually need less concrete volume and are usually completely placed in less than one hour, resulting in full liquid head pressure.

42
Q

What is full liquid head pressure?

A

The pressure formed when forms are completely filled within one hour.

43
Q

The most common method of plumbing a column form is by using ___________.

A

Hand level and long straight edge

44
Q

Describe the proper bracing of column forms.

A

Two braces from adjacent sides are used. Four braces total.

45
Q

What can be added to further support and stabilize long braces?

A

A knee brace for vertical support and cross-bracing for lateral stability.

46
Q

List two important features when creating a ribbed architectural wall form with bevelled strips of wood?

A
  1. The strips of wood should be kerf cut on one side to allow for swelling.
  2. The strips of wood should be attached to the form face with finishing nails so they remain embedded in the concrete when the form is removed.
47
Q

The main components of a vertical slip form holding the inside and outside forms to the specified wall thickness are called ____.

A

Yokes.

48
Q

How are slip forms corrected when they are out of plumb?

A

By increasing or decreasing the Jack rate of the required jacks.

020302 (6 decks)

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