Question 1

A seismic joint is generally similar to a building expansion joint but smaller in width.

Accepted Answer

A) True 
 B)False

Question 2

Which exterior- use sealant has the highest movement capability and which sealant has the highest abrasion resistance?

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The answer of Which exterior- use sealant has the highest...

Question 3

Because the provision of static joints adds to the stresses on a component, requiring a larger cross section, which increases the cost of the component, should the static joints be avoided? Explain.

Accepted Answer

The answer of Because the provision of static joints adds...

Question 4

Which structural materials (i)undergo both thermal expansion and thermal contraction during service, and which materials (ii)undergo only moisture expansion (no moisture shrinkage)during service?

Accepted Answer

The answer of Which structural materials (i)undergo both thermal expansion...

Question 5

Silicone, polyurethane, and polysulfide are commonly used as joint sealants. Explain their relative suitability for various applications.

Accepted Answer

The answer of Silicone, polyurethane, and polysulfide are commonly used...

Question 6

A joint between two walls has been determined to be 0.5 in. if the joint is not to be filled with a sealant. If the same joint is to be filled with a class 50 sealant, its width should be

Accepted Answer

A) 1/4 in. maximum. 
B) 1/4 in. minimum. 
C) 2- 1/2 in. minimum. 
D) 1 in. minimum. 
E) none of the above.

Question 7

Building separation joints in a long rectilinear building are generally located at every

Accepted Answer

A) 400 ft on center. 
B) 250 ft on center. 
C) 500 ft on center. 
D) 350 ft on center. 
E) none of the above.

Question 8

In determining the amount of thermal expansion or contraction of a component due to temperature change, check below the factor(s)that are not relevant.
1. Change in temperature of component
2. Compressive strength of the component's material
3. Tensile strength of the component's material
4. Original length of material
5. Coefficient of thermal expansion

Accepted Answer

The answer of In determining the amount of thermal expansion...

Question 9

A rectangular building with a large footprint in both directions has been provided with one separation joint (SJ)in each direction so that the SJs cross each other at right angle. The building is a frame structure, consisting of columns and beams and it has been decided to duplicate the columns and beams at the joint. How many columns will be needed at the location where the joints cross?

Accepted Answer

The answer of A rectangular building with a large footprint...

Question 10

Why should a joint sealant have adhesion only to the two opposite surfaces of a joint? Explain.

Accepted Answer

The answer of Why should a joint sealant have adhesion...

Question 11

Should a clear space be provided between a floor slab (or a roof slab)and a partition wall below? Explain your answer.

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The answer of Should a clear space be provided between...

Question 12

Which of the following materials does not represent a joint sealant?

Accepted Answer

A) Silicone 
B) Polysulfide 
C) Polyvinyl chloride 
D) Polyisobutylene

Question 13

The equation used for determining the thermal movement, t, of a member is

Accepted Answer

A) 6t = L(Ot). 
B) 6t = αL(Ot). 
C) 6t = [L(Ot)]/α. 
D) 6t = (αL)/(Ot). 
E) 6t = [α(Ot)]/L.

Question 14

Do metals (such as steel and aluminum)expand or contract greater than plastics, such as (polyethylene and nylon)when subjected to the same temperature change?

Accepted Answer

The answer of Do metals (such as steel and aluminum)expand...

Exam 9: Principles of Joints and Sealants Expansion and Contraction Control