BC8

Question 1

most common concrete masonry units

Answer 1

hollow concrete blocks
8x8x16

Question 2

mortar

Answer 2

compressive strength up to 75psi
made of Portland cement lime and sand
old mortar made of lime and sand
cannot mix when repairing

Question 3

fire resistive masonry

Answer 3

has a rating of 2-4 hours
no fire resistive can be effected by even weather
last part of a building to fail after wood joists

Question 4

ordinary construction

Answer 4

masonry wood joisted

Question 5

non load bearing masonry

Answer 5

gypsum block
lightweight concrete block
can be used with steel frame for load bearing
stone masonry often used as architectural veneer

Question 6

non reinforced masonry walls

Answer 6

limited to 6 stories
found in early 20th century buildings

Question 7

brick courses

Answer 7

stretcher course- end to end
soldier course- vertically on end
header course- end facing out

Question 8

reinforced masonry walls

Answer 8

up to 10 stories with 12 inch thickness

Question 9

fire cut

Answer 9

end of a wood joist or beam cut at a slight angle into a masonry wall
allow beam to fall away freely from the wall in case of collapse

Question 10

openings in masonry walls

Answer 10

problem because mortar joints provide little tensile support
lintel, arch or corbel
corralling used to improve aesthetics