Question 1

Before the actual cleaning of a brick wall begins, test the cleaning solution on an area _____ in size.&#10;A) no larger than 10 square feet&#10;B) no larger than 5 square feet&#10;C) approximately 10 square feet&#10;D) approximately 20 square feet

Accepted Answer

D

Question 2

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

Accepted Answer

Cleaning brick and concrete block can result in loose debris falling from heights, which can pose a danger to one's head. Therefore, a hard hat should be worn to protect oneself from potential injuries.

Question 3

_____ eliminates the danger of mortar smears, acid burn, and efflorescence but poses the risk for the brick face being damaged or scarred.&#10;A) Dry sandblasting&#10;B) Chemical cleaner&#10;C) Muriatic acid&#10;D) Hand washing with a bucket and brush

Accepted Answer

Dry sandblasting eliminates the risk of mortar smears, acid burn, and efflorescence associated with chemical methods, but it can damage or scar the brick face if not done carefully.

Question 4

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

Accepted Answer

It is recommended to wait at least 7 days after the completion of new clay or shale brickwork before cleaning or washing it down, to allow it to fully cure and avoid any possible damage to the surface.

Question 5

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

Accepted Answer

Muriatic acid is a strong and potentially dangerous acid that can cause damage to the surface being cleaned and harm the user if not handled properly. It should not be used as a cleaning solution for new brickwork as it can cause discoloration and damage to the surface. A mild detergent and water solution is recommended for cleaning new brickwork.

Question 6

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

Accepted Answer

Mixing the mortar to the correct consistency is important as it ensures that the mortar adheres properly to the wall without excessive smearing on the face of the wall.

Question 7

Stubborn stains on concrete block should never be removed chemically.

Accepted Answer

Stubborn stains on concrete block can be removed chemically using products such as muriatic acid or concrete cleaners designed for heavy-duty cleaning. However, it is important to follow safety precautions and instructions carefully, as these chemicals can be harmful if not used properly. It is always recommended to try non-chemical methods first and consult a professional if necessary.

Question 8

Always clean brickwork from the bottom to the top.

Accepted Answer

Cleaning brickwork from the bottom to the top ensures that any cleaning solution and dirt does not drip down onto already cleaned areas. It also prevents streaks and drip marks from forming.

Question 9

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

Accepted Answer

Dry masonry, which is without mortar, allows the cleaning solution to be absorbed into the porous material and may create certain issues such as mortar smear, white scum, or the formation of efflorescence.

Question 10

Short rubber gloves are adequate protection for cleaning masonry.

Accepted Answer

Short rubber gloves do not provide adequate protection for cleaning masonry, as it can be abrasive and harmful to the skin. It is recommended to use heavy-duty gloves that cover the wrists and arms for this task.

Question 11

New clay or shale brickwork should not be washed for _____ after brickwork is completed.&#10;A) two weeks&#10;B) at least 7 days&#10;C) 72 hours&#10;D) 24 hours

Accepted Answer

The answer of New clay or shale brickwork should not...

Question 12

For cleaning masonry, a _____ is used to remove the large particles and does not leave rust stains on the wall.&#10;A) hammer&#10;B) metal chisel&#10;C) metal scraper&#10;D) wooden paddle

Accepted Answer

The answer of For cleaning masonry, a _____ is used...

Question 13

Using too much water when cleaning brickwork will cause streaking.

Accepted Answer

The answer of Using too much water when cleaning brickwork...

Question 14

Failure to rinse a cleaned wall with plenty of water may result in ______ .&#10;A) reduction of the the mortar strength&#10;B) longer drying time&#10;C) the formation of white scum&#10;D) deterioration of the brickwork

Accepted Answer

The answer of Failure to rinse a cleaned wall with...

Question 15

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

Accepted Answer

The answer of Improperly mixed or overly concentrated solutions can...

Deck 30: Cleaning Brick and Concrete Block