Chapter 24 Flashcards
The term CMU is generally used as an acronym for?
Concrete mansory unit
The cementitious material(s) in contemporary masonry mortar consist(s) of:
a. Portland Cement
b. Portland cement and sand
c. Portland cement, lime, and sand
d. Portland cement and Lime
e. Lime
d. Portland Cement and Lime
Which of the following materials increases the mortar’s cohesiveness?
a. Mortar joint profile
b. Lime
c. sand
d. All of the above
Lime
What material increases the compressive strength of mortar?
Portland Cement
What material increases the mortar’s workability?
lime
A wall made of Portland Cement mortar (without lime) is more water tight than a wall made of Prtland cement and lime mortar. True or flase?
False
The flexural tensile bond strength of masonry wall is relevant in what situation?
in an unreinforced masonry wall subjected to lateral loads
The flexural tensile bond strength of a masonry wall is a function of: a. the compressive strength of mortar b. the type of masonry units c. the quality of workmanship d, the curing of mortar e. all of the above
all of the above
For a masonry wall, the compressive strength of mortar should be as high as economically feasible. True or false?
False
Masonry mortar types are classified as:
a. Types M, S, N, and O.
b. Types I,II, III, IV
c. either a or b
a. Types M, S, N, and O
The mortar with the highest compressive strength is?
Type M
The mortar most commonly used in an exterior masonry veneer wall is?
Type N
The mortar commonly recommended for use in masonry walls is seismic regions is?
Type S
Mortar may be specified either by proportion specification or by property specification. Which of these two is more commonly used?
a. Proportion specification
b. Property specification
a. Proportion specification
When mortar is specified using proportion specification, various solid materials that constitute masonry mortar are proportioned based on their?
Dry volumes
A preblended cementitious mix for masonry mortar is available as:
a. PCL cement
b. Masonry cement
c. mortar cement
d. a and b
e. b and c
e. b and c
The most commonly used mortar joint thickness is?
3/8in.
Which of the following mortar joint profiles should be specified for an exterior wall?
a. Concave joint
b. Raked joint
c. Flush joint
a. Concave joint
Bricks that have core holes are what kind of bricks
Extruded bricks
Bricks that have frogs are what kind of bricks?
molded bricks
The primary reason for providing core holes in bricks is to:
a. reduce the weight of bricks
b. provide uniform drying and firing of bricks
c. increase the shear resistance of masonry walls
d. none of the above
Provide uniform drying and firing of bricks
The nominal dimension of a masonry unit whose actual dimension equals 7 5/8 in. is:
a. 7in.
b. 7 1/4in.
c. 7 1/2in.
d. 7 3/4in.
e. none of the above
e. none of the above
A masonry unit that has no voids (e.g. no core holes) is referred to as a what type of solid unit?
100% solid unit
A masonry unit that has 20% voids (e.g., 20% core hole area) is referred to as what type of unit?
Solid unit
