Deleterious Materials Flashcards

1
Q

What is a deleterious material?

A

Deleterious materials were materials that were used in good fath at the time but have been proven to be a risk to buildings.

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2
Q

Describe the issues with Calcium Silicate brickwork.

A

Used in lieu of concrete, often for inner leafs of cavity walls, it is susceptibel to shrinking but can perform well if used correctly.

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3
Q

Describe the issues with Chloride Concrete Additives.

A

Used as an accelerator in concrete but can reduce the passivity in damp conditions.

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4
Q

Describe the issues with High Alumina Cement.

A

Mainly used in pre-cast roof and floor beams produced during the 1950s-70s and is susceptible to loss of strength in hot or humid conditions.

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5
Q

Described the issues with using Sea Dredged Aggregates.

A

Sea Dregeded Aggregates may contain salts which can risk corroding the reinforcement. Proper washing and treatment of the aggregate can mitigate this.

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6
Q

Describe the issues with Woodwool Slabs.

A

Used as deckings for flat roofs, but can reduced fire resistance and lose strength.

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