1. by Reda Gado National research center(NRC), Egypt
Recycling and utilization assessment of some industrial by-product waste for geopolymerization reaction by
Reda Gado
National research center(NRC), Egypt

2. Why Geopolymer ????
Nowadays, the world is looking for alternative binder material for OPC which cause a lot of environmental problems during manufacture process.

3. What is Geopolymer ?
Geopolymer is a class of inorganic polymer formed by the reaction between an alkaline solution and an aluminosilicate source material at R. T. The term “geopolymer” was first used by J. Davidovits in late 1970.

4. Advantages of Geopolymer
High compressive strength and comparable to OPC cement
Excellent resistance to sulfate attack
Good acid resistance
Excellent fire resistance with low thermal properties
Freeze –thaw resistance
Corrosion resistance
Low creep
Minimum drying shrinkage
Immobilization of toxic and heavy metals
Environmentally friendly nature
A potential cost effective with low energy consumption

5. Geopolymer
Alkaline activation
Sodium hydroxide
Potassium hydroxide
Acidic activation
Phosphoric acid

6. Pyramids of Giza: The Silica Connection.
Pyramids of Giza: The Silica Connection.

7. Materials and Technique
Fly Ash
Clay
Alumina-silicate waste
Slag

8. Geopolymerization Technique
Dissolution
Gelation and reorganization
Polymerization and hardening

11. Highlights
The geopolymerization process of waste fired clay brick was successfully carried out.
The inclusion of slag leads to improvement in the physico-mechanical properties.
These potential recycling processes can generate significant benefits.
The lowest compressive strength value was recorded 15 Mpa for specimen (GS0).
The highest compressive strength value was recorded 83 Mpa for specimen (GS60).

13. Investigate the influence of silica modulus SiO2/Na2O and liquid/solid ratio on the geopoymerization reaction of waste fired clay bricks (Grog)

14. Silica modulus ratio: 2.5, 2, 1.5, 1.0, 0.75, 0.5, 0.25
Liquid/solid ratio: 0.30, 0.35, 0.40

15. Thanks