Deleterious Materials Flashcards
What is a deleterious material?
Deleterious materials were materials that were used in good fath at the time but have been proven to be a risk to buildings.
Describe the issues with Calcium Silicate brickwork.
Used in lieu of concrete, often for inner leafs of cavity walls, it is susceptibel to shrinking but can perform well if used correctly.
Describe the issues with Chloride Concrete Additives.
Used as an accelerator in concrete but can reduce the passivity in damp conditions.
Describe the issues with High Alumina Cement.
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.
Described the issues with using Sea Dredged Aggregates.
Sea Dregeded Aggregates may contain salts which can risk corroding the reinforcement. Proper washing and treatment of the aggregate can mitigate this.
Describe the issues with Woodwool Slabs.
Used as deckings for flat roofs, but can reduced fire resistance and lose strength.