Laitance on a freshly hardened concrete surface is best defined as:
AA thin layer of cement slurry mixed with fine silt/dust rising to the surface due to excess water
BEfflorescence caused by sulphate attack
CAir pockets formed by improper vibration
DSurface scaling caused by frost action
Explanation
Laitance is a weak, non-durable layer of cement and fine particles brought to the concrete surface by bleeding water, which must be removed before placing new concrete.

No Comments