This document discusses other cementitious materials that can be used in concrete, including natural pozzolans like volcanic tuffs and diatomaceous earth, and manufactured pozzolans such as metakaolin and rice husk ash. Using these pozzolanic materials provides benefits to concrete like low permeability, high strength, sulfate and alkali-silica resistance, and they react to form calcium silicate hydrate. Manufactured pozzolans include heat-treated kaolin clay and rice husk ash combustion ash. Calcined clay and shale can also reduce alkali-silica reactivity. Several relevant websites are provided.

1. CON 123
Cementitious Materials
Session 10
Other Cementitious Materials

2. Other Pozzolans
 Natural Pozzolans
 Volcanic Tuffs
 Diatomatous Earth
 Manufactured Pozzolans
 Metakaolin
 Rice Husk Ash
2

3. Concrete Benefits
 Low Permeability
 High Strength Applications
 Sulfate Resistance
 Low Heat Hydration
 Alkali Silica Resistance
 Reacts to form C-S-H
 Special requirements
3

4. Manufactured Pozzolans
 Heat treated kaolin clay
 Multiple grades
 Source of clay is
important

5. Rice Husk Ash
Combustion ash from rice
harvest debris

6. Reduction of ASR by Calcined Clay
and Calcined Shale
Reduction of alkali-silica
reactivity by calcined clay
and calcined shale

7. Web-sites
 www.cement.org
 www.concrete.org
 www.slagcement.org
 www.astm.org
 www.usgs.gov
 Visit a website and write a report