Sulphate attack in external walls causes
A) The bricks to expand
B) The bricks to contract
C) The mortar to expand
D) The mortar to contract
E) The wall ties to expand

Question

Quizplus · Accepted Answer

Sulphate attack in external walls causes the mortar to expand. This is because sulphates react with the calcium hydroxide in the mortar to form calcium sulphate, which is a larger molecule. This expansion can cause the mortar to crack and crumble, which can lead to the collapse of the wall.

Sulphate Attack in External Walls Causes