Question 1

Which of the following joint sealants has the highest movement ability?

Accepted Answer

Silicone sealants have the highest movement capability among the options listed, making them highly suitable for applications requiring significant flexibility and elongation.

Question 2

A building separation joint in a multistory building generally

Accepted Answer

A building separation joint is usually designed to provide independent movement between different parts of a building due to thermal, seismic, or other types of loads. It is typically located at the roof level and extends through all floors to allow for vertical movement. Therefore, option C, "runs through all floors and the roof," is the best choice.

Question 3

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

Accepted Answer

Building separation joints are typically located at every 250 feet on center in a long rectilinear building. This is to allow for movement and expansion/contraction of the building due to temperature changes, moisture, and other factors.

Question 4

The unit of measure for the coefficient of moisture expansion (/x)is

Accepted Answer

The answer of The unit of measure for the coefficient...

Question 5

A spandrel beam in a building is a beam that

Accepted Answer

A spandrel beam runs along the outside edge of a floor or roof, often supporting the exterior wall or façade.

Question 6

Which of the following materials is subjected to moisture movement?

Accepted Answer

All of the above materials are subjected to moisture movement. Concrete and brick are porous materials that can absorb and release moisture causing expansion and contraction, while wood can naturally absorb and release moisture causing swelling and shrinking.

Question 7

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

Accepted Answer

The equation given in choice B is the correct formula for determining thermal movement. It includes the variables of coefficient of thermal expansion (α), length of the member (L), and the change in temperature (Ot). The other choices either have incorrect variables or are not the correct formula for thermal movement.

Question 8

Which of the following materials has irreversible moisture expansion during service, that is, after construction?

Accepted Answer

Brick is known for its irreversible moisture expansion during service. This means that when bricks absorb moisture, they expand and do not return to their original size even after drying out, which can affect the structural integrity and aesthetic of a building over time.

Question 9

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

Accepted Answer

A seismic joint is designed to accommodate movements during an earthquake, which can be significantly larger than the movements accommodated by a typical building expansion joint.

Question 10

In determining the total width of a movement joint between building components, we account for the dimensional and construction tolerances. Poor or inadequate quality control on a construction site

Accepted Answer

Poor or inadequate quality control on a construction site can lead to errors and inconsistencies in the construction process, resulting in an increase in construction tolerances. This can affect the total width of a movement joint between building components, as the tolerances must be accounted for in order for the joint to function properly.

Question 11

The unit of measure for the coefficient of thermal expansion (a)is

Accepted Answer

The coefficient of thermal expansion (a) is the fractional change in length or volume of a material per unit change in temperature. It is defined as ΔL/LΔT or ΔV/VΔT, where L and V are the original length and volume, respectively, and T is the temperature. The unit of measure for a is therefore °C-1 or °F-1, as it represents the change in length or volume per unit temperature change.

Question 12

Creep deformation is caused by

Accepted Answer

Creep deformation is caused by dead loads, which are the permanent loads on a structure such as its own weight and the weight of fixed equipment. Live loads, which are temporary loads such as people, furniture, and wind loads, do not typically cause creep deformation.

Question 13

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

The answer of A joint between two walls has been...

Question 14

Which of the following materials has the highest coefficient of thermal expansion?

Accepted Answer

Plastics generally have the highest coefficient of thermal expansion among the options listed. This means they expand more than metals (like aluminum and steel), glass, and concrete when heated.

Question 15

Creep deformation occurs in

Accepted Answer

The answer of Creep deformation occurs in
...

Question 16

The sealant in a joint works best when it is subjected to

Accepted Answer

The answer of The sealant in a joint works best...

Question 17

The width of a building separation joint is generally

Accepted Answer

The width of a building separation joint is generally 1-1/2 in. to 2 in. This joint accommodates the expansion and contraction of a building's materials due to temperature changes and prevents damage to the structure.

Question 18

A non- load- bearing wall that runs under a spandrel beam should be adequately separated from the beam to allow the beam to move freely in the

Accepted Answer

A non-load-bearing wall that runs under a spandrel beam should be adequately separated to allow the beam to move freely in the vertical direction due to deflection or thermal expansion/contraction, without imposing stresses on the wall.

Question 19

Which of the following joint sealants has the highest abrasion resistance?

Accepted Answer

Polyurethane has the highest abrasion resistance among the given joint sealants. It is also resistant to chemicals, weathering, and aging which makes it suitable for various applications including concrete floors, highways, and bridge decks.

Question 20

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

Accepted Answer

Polyvinyl chloride is a thermoplastic material commonly used for pipes and profiles, but it is not typically used as a joint sealant. Silicone, polysulfide, and polyisobutylene are all commonly used as joint sealants due to their flexibility and durability.

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