Saturated surface dry (SSD[citation needed]) is defined as the condition of an aggregate in which the surfaces of the particles are "dry" (i.e., surface adsorption would no longer take place), but the inter-particle voids are saturated with water. In this condition aggregates will not affect the free water content of a composite material.[1][2]

The water adsorption by mass (Am)) is defined in terms of the mass of saturated-surface-dry (Mssd) sample and the mass of oven dried test sample (Mdry) by

See alsoEdit


  1. ^ "Aggregate Moisture in Concrete". Concrete Construction. Retrieved 2018-11-08.
  2. ^

3- Neville, A. M. “Properties of Concrete”, 4th & Final ed., Longman, Malaysia, 1995 rep. 1996, 844 pp.
4 - Field usage information from a manufacturer -