CHP16-3

ASTM F2170 is the standard test method for determining relative humidity in concrete ___________ slabs?

• Floor

• Steel

• Brick

• Block

The temperature is important during concrete curing?

• Not true

• Only at freezing conditions

• True

• Only in direct sunlight

Coatings are available that can be applied to new concrete?

• True

• Not true

• True on vertical surfaces only

• True on horizontal surfaces only

Electrodes transmit parallel __________ frequency signals with an electronic moisture meter?

• High

• Very slow

• Low

• Super fast

ASTM D 4262 is a test relating to the measurement of ____ after acid etching the concrete?

• Moisture

• Porosity

• pH

• Hardness

The plastic sheet method and electric meter are two test methods on concrete for?

• Moisture testing

• pH testing

• Porosity testing

• Hardness testing

Abrasive blast cleaning is a typical method of surface preparation used on concrete surfaces?

• Not true

• True

• Only on vertical surfaces

• Only on horizontal surfaces

A trial method of surface preparation (blast cleaning) should be conducted at the start of the works?

• Only if the client insists

• Yes, this is recommended

• Not necessary

• Only if you are using non-metallic abrasive

What is the pH range of new concrete?

• 1-3

• 3-6

• 6-9

• 12-14 (highly alkaline)

Uncoated concrete absorbs moisture and carbon dioxide, also ............... and ............... etc?

• Alkali and phosphates

• Chlorides and sulphates

• Acids and sulphates

• Nitrates and phosphates