1 Geopolymer a New Concrete Binder Co-worked by: Dr. Marianne Saba & Dr. Georges Aouad University of Balamand- Lebanon Civil Engineering Department Materials Laboratory
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1
Geopolymer a New Concrete BinderCo-worked by:
Dr. Marianne Saba & Dr. Georges Aouad
University of Balamand- Lebanon
Civil Engineering Department
Materials Laboratory
2
• Introduction (Why Geopolymer?)
• Experimental Work
• Results & Discussion
• Conclusion/ Future Work
Outline
Why Geopolymer ?
3
Advantages• Fire resistant • Chloride and Sulfate Resistant • Low Carbon Emission• Sustainable and Durable
Concrete
Disadvantages• Lack of Standards• Difficult to create as it requires
special handling• Highly depending on casting
and Curing Conditions
MetakaolinSource of Silica & Alumina
Normalized SandWell graded aggregates
Alkali solution:(Activator)Sodium Silicate solution + Sodium Hydroxide pellets
Experimental Work :Material
4
5
QuarteringEvenly distributed Sand Particles
CalcinationTransform Kaolin to Metakaolin (MK)
Solution Preparation Cooling since Exothermic Reaction
Experimental Work :Method
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Mold Preparation Metakaolin Liquid Added
Workability Test Vibrating Table
Process : Mixing
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Vibrated Samples Oven Curing at 40°C Demolded Samples
Curing at 25°C F’c Testing
Process : Curing and Testing
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Ø As a first step, we varied the SiO2/NaO2 ratio (1; 1.5; 2.5 & 3) and kept a fixed Liquid/Binder ratio (L/B) = 1.8
Ø In a second phase we fixed SiO2/Na2O =1.5 and varied the L/B between 1.5 and 1.8
Ø The third phase was to substituted some of the main raw material MK with materials such as Silica Powder; Silica Fume and MSWBA.
Ø Results are presented in the slides below.
Laboratory Work
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Results : Compressive Strength F’c
• Fixed Parameters :o L/B =1.8o Source Material
• Varying Parameter:o SiO2/Na2O ratio
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
F'c i
n M
Pa
Days
F’c for Different SiO2/Na2O Ratio
Ratio 1 Ratio 1.5 Ratio 2.5 Ration 3
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• Fixed Parameters :o SiO2/Na2O =1.5o Source Material
• Varying Parameter:o L/B Ratio
Con’t Results: Compressive Strength
0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
F'c in
MPa
Days
F’c for Different SiO2/Na2O Ratio
L/B 1.5L/B 1.8
Con’t Results : Workability
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0
5
10
15
20
25
OPC L/B = 1.8 L/B= 1.5
Dia
met
er in
cm
Workability
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0
10
20
30
40
50
60
0 10 20 30 40 50 60 70 80 90 100
F'c in
MPa
Days
F’c for different substitution Silica based Material
10% substitution Silica Powder10% substitution Silicafume10 % BAL/B 1.8
Con’t Results: Substitution
• Fixed Parameters :o L/B =1.8o SiO2/Na2O = 1.5
• Varying Parameter:o Raw material
containing Si
§ F’c for L/B =1.8 Increases after 3 days up to 28 days , and from heron decreases continuously
§ F’c for L/B =1.5 Increases after 3 days and maintain a near constant value after 30 days
èThe less solution used the higher the F’c
§ Replacing Metakaolin (100%) will not give satisfying results
Conclusion
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§ Make the Geopolymer with substitution rates of 10% Silica Fume, Silica Powder and
MSWBA with a L/B =1.5 and compare them with L/B =1.8
§ Try to find a local source of MK to make the production of Geopolymer cheaper .
§ Work on the Environmental Assessment of the Geopolymer.
§ Work on Solidification/Stabilization of Heavy Metals in Geopolymers.
Future Work
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Thank you for your Attention
Any Questions ???
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