G2 - LT #1 Factors of affected form

Question 1

List the 5 main factors that affect form design:

Answer 1

1) Safety
2) Architectural design
3) Types of concrete members being cast
4) Efficiency
5) Environmental conditions

Question 2

What special design considerations must be made for wall forms:

Answer 2

Wall form design depends on the form system and desired rate of placement.

Question 3

What special design considerations must be made for suspended slab designs:

Answer 3

Suspended slab design depends mainly on the slab form.

Question 4

What special design considerations must be made for pre-cast concrete design?

Answer 4

Depends on multiple uses and high temperature curing.

Question 5

What are two factors that affect pressure on the formwork?

Answer 5

1) Rate of placement 2) Rate of concrete setting

Question 6

How does the air temperature affect the rate of placement?

Answer 6

Direct proportions - air temperature increases, so can placement rate and when air temperature decreases, so should the placement rate.

Question 7

What type of admixtures will increase the slump of the concrete?

Answer 7

Plasticizers

Question 8

What type of formwork is used in dam construction:

Answer 8

Cantilevered construction

Question 9

Architectural concrete allows for a deflection of:

Answer 9

1/400,

Narrow stud spacing and low rate of place for concrete is required.

Question 10

What is the most important aspect of slab on grade concrete?

Answer 10

Sub grade for slab must be very well compacted, made from materials that drain very well.

Question 11

What is a footing?

Answer 11

Form is usually a simple ladder constructed of 2x10 with cleats 24” to 32” o.c

Question 12

To create a smooth, nice finished above grade wall, what is required?

Answer 12

Rate of placement slow, stud spacing will have to be slow.

Question 13

Main concern with Falswork is:

Answer 13

The falsework being used to support slab

Question 14

Main concern with Pre-cast

Answer 14

Being able to withstand hundreds of re-uses, sometimes up to 3 times a day.

Question 15

What is the rate of placement?

Answer 15

Rate of placement - height of concrete that is placed in one hour

Question 16

A tall structure has a lot of pressure where?

Answer 16

The bottom area

Question 17

Slump is measurement of:

Answer 17

Consistency

Question 18

Concrete made with low water/cement ratio and no admixtures to increase the slump will have:

Answer 18

A low slump

Question 19

Fluid (very liquid9) concrete created by plasticizer will produce a pressure, similar to fully vibrating the form what is needed?

Answer 19

Needs to be accounted for in the formwork design.

Question 20

Where should the end pump be when placing in concrete?

Answer 20

End of the pump hose should be positioned as close to the level of the previously placed concrete as possible.

Question 21

If the concrete is allowed to fall through rebar:

Answer 21

Cement paste sticks to the rebar and large aggregate falls to the bottom, creating honey combing

Question 22

When placing concrete with a crane and bucket, what care should be taken?

Answer 22

Do not overload the forms by placing it in one spot.