Question

The specific surface (in cm${}^2$/g) of good portland cement should not be less than:

• A. 500
• B. 1100
• C. 2250
• D. 3200

Answer 1

The correct option is C 2250

Fineness (Sp.surface in m${}^2$/kg) for portland cement is

OPC 33 $\to$ 225 (m${}^2$/kg)
OPC 43 $\to$ 225 (m${}^2$/kg)
OPC 53 $\to$ 225 (m${}^2$/kg)

Rapid hardening cement (RHC) = 305 m${}^2$/kg
Low heat cement = 320 m${}^2$/kg