Deck 30: Cleaning Brick and Concrete Block

Question 1

Before the actual cleaning of a brick wall begins, test the cleaning solution on an area _____ in size.

A) no larger than 10 square feet
B) no larger than 5 square feet
C) approximately 10 square feet
D) approximately 20 square feet

Answer 1

D

Question 2

A hard had should be worn when cleaning brick and concrete block.

Answer 2

True

Question 3

_____ eliminates the danger of mortar smears, acid burn, and efflorescence but poses the risk for the brick face being damaged or scarred.

A) Dry sandblasting
B) Chemical cleaner
C) Muriatic acid
D) Hand washing with a bucket and brush

Answer 3

A

Question 4

Do not clean or wash down new clay or shale brickwork until at least 7 days after brickwork is completed.

Question 5

Muriatic acid should be used as a cleaning solution for new brickwork.

Question 6

Mixing the mortar to the right consistency prevents excessive smearing on the face of the wall.

Question 7

Stubborn stains on concrete block should never be removed chemically.

Question 8

Always clean brickwork from the bottom to the top.

Question 9

Dry masonry allows absorption of the cleaning solution and may result in mortar smear, white scum, or the development of efflorescence.

Question 10

Short rubber gloves are adequate protection for cleaning masonry.

Question 11

New clay or shale brickwork should not be washed for _____ after brickwork is completed.

A) two weeks
B) at least 7 days
C) 72 hours
D) 24 hours

Question 12

For cleaning masonry, a _____ is used to remove the large particles and does not leave rust stains on the wall.

A) hammer
B) metal chisel
C) metal scraper
D) wooden paddle

Question 13

Using too much water when cleaning brickwork will cause streaking.

Question 14

Failure to rinse a cleaned wall with plenty of water may result in ______ .

A) reduction of the the mortar strength
B) longer drying time
C) the formation of white scum
D) deterioration of the brickwork

Question 15

Improperly mixed or overly concentrated solutions can etch or wash out cementitious materials from the mortar joints.