Supplementary Cementitious Materials

Concrete Technology

What is SCM’s

• Materials that, when used in conjunction with portland or blended cement, contribute to the properties of concrete through hydraulic or pozzolanic activity or both.

• A hydraulic material reacts chemically with water to form cementitious compounds.

Type

• Fly ash • slag cement• silica fume and natural pozzolans 

• Calcined shale• Metakaolin • Other calcined clays

Supplementary cementitious materials. From left to right, fly ash (Class C), metakaolin (calcined clay), silica fume, fly ash (Class F), slag cement, and calcined shale.

Specifications and Classes of Supplementary Cementitious Materials

Chemical Analysis and Selected Properties of Typical Fly Ash, Slag Cement, Silica Fume, Calcined Clay, Calcined Shale, and Metakaolin

On Freshly Mixed Concrete

On Hardened Concrete

Effects on Freshly Mixed Concrete

Effects on Hardened Concrete

Home Work 02

• Find following standard :• ACI 232.2R-03, Use of Fly Ash in Concrete• ACI 233R-03 (Reapproved 2011), Slag Cement in

Concrete and Mortar • ACI 234R-06 (Reapproved 2012), Guide for the Use of

Silica Fume in Concrete• ACI 232.1R-12, Report on the Use of Raw or Processed

Natural Pozzolans in Concrete• Write on your own:

• Speficication, technical aspect, and how to use each one of them in concrete

• Collect your work within 48 hours, after the class!