kamhangrittirong - green binder technology …

GGreen binder technology development reen binder technology development

using fly ash based geopolymerusing fly ash based geopolymerGGreen binder technology development reen binder technology development

using fly ash based geopolymerusing fly ash based geopolymer

Parames Kamhangrittirong, Parames Kamhangrittirong, Prasert Suwanvitaya, Prasert Suwanvitaya, Patcharaporn Suwanvitaya Patcharaporn Suwanvitaya and Prinya Chindaprasirtand Prinya Chindaprasirt

OutlineOutline

IntroductionIntroduction

Experimental programExperimental program

Results and discussionResults and discussion

ConclusionsConclusions

BackgroundBackgroundIntroductionIntroduction

Lampang Province-Mae Moh

3,500,000 tons/year

BackgroundBackground

Constructionmaterials

Geopolymer

WASTE


SustainableSustainableDevelopmentDevelopment

Geopoly-merization

Geopolymer chemistryGeopolymer chemistryIntroductionIntroduction

Si – Al Materials

Sodium hydroxide Sodium silicate

Mixture Slurry

GeopolymerGeopolymer

Heating for geopolymerization


-sodium hydroxide + sodium silicate + waterWhen mixed;2NaOH + Na2SiO3 + 3H2O = 4NaOH + Si(OH)4NaOH + Si(OH)44

Sodium SilicateSodium hydroxide

Solution


4 NaOH + Si4+

+ 4 Na+

OH

OH Si OH

OH

Al and Si dissolution from Al-Si materials as hydrated reaction products with NaOH

4 NaOH + Al4+

OH

OH Al OH

OH

+ 4 Na+

Step 1


Poly (sialate – siloxo)OH

OH Si OH

OH

OH

OH Al OH

OH

OH

OH Si OH

OH

+ +

OH OH OH

OH Si O Al O Si OH

OH OH OH

+ 2 H2O

Step 2

Si AlO

O

OOO

O

O


SiO2

(Molar mass 39.9971 g/mol)

Al2O3

(Molar mass 101.96 g/mol)H2O


Na2O


SiO2


Na2O


H2O


Si–Al Materials NaOH Soln Na2SiO3 Soln

Oxide-mole ratios of reactant mixture

10.0-25.0H2O / Na2O

3.50-4.50SiO2 / Al2O3

0.80-1.60Na2O / Al2O3

0.20-0.48Na2O / SiO2

Value(Davidovits : 1982)

Molar ratio

ObjectivesObjectives

1

Effect of alkali Effect of alkali solution ratiosolution ratioSiOSiO2 2 / Na/ Na22OO

(Ms= 0.20(Ms= 0.20--0.50)0.50)

2

Comparison of Comparison of fly ash contentfly ash content

(65 & 70%)(65 & 70%)


Mixture Mixture

Mix BMix B--22Mix AMix A--220.300.30




Fly ash 65%Fly ash 65%Alkali solution 35%Alkali solution 35%

Fly ash 70%Fly ash 70%Alkali solution 30%Alkali solution 30%MsMs

Experimental Experimental programprogram

Experimental Experimental programprogram

Mixture Mixture

Testing methodTesting methodExperimental Experimental

programprogram

SpecimenSpecimen Storage unitStorage unit

3.81cm.

3.81

cm.

Testing methodTesting methodExperimental Experimental

programprogram

SEM/EDSSEM/EDS

XRDXRD

SEM/EDSSEM/EDSResults & Results &

discussiondiscussion

Results & Results & discussiondiscussion

Si/Al ratio

Group AGroup A2.202.20--2.562.56

Group BGroup B2.752.75--2.852.85

XRDXRDResults & Results &

discussiondiscussion

Results & Results & discussiondiscussion

Compressive strengthCompressive strength

FA 65 % FA 70 %

29.2 MPa Max. at Ms=0.2021.5 MPa Min. at Ms=0.50

24.4 MPa Max. at Ms=0.2020.1 MPa Min. at Ms=0.50

Results & Results & discussiondiscussionEffect of fly ash contentEffect of fly ash content

Results & Results & discussiondiscussionEffect of alkali solution ratio Effect of alkali solution ratio

(SiO(SiO2 2 / Na/ Na22O)O)

The microstructure of fly ash based geopolymer revealed a porous and homogeneous gel structure.

Microstructure

The dissolution of aluminosilicate in raw materials could be seen from the changes in the XRD patterns.


0.00

200.00

400.00

600.00

800.00

1000.00

1200.00

10 15 20 25 30 35 40 45 50 55 60 65 2 � (Degree)

Mix 1-30oc

Fly ash

Mix 1-40oc

Mix 1-50oc

Mix 8-30oc

Mix 8-40oc

Mix 8-50oc

Mix 15-30oc

Mix 15-40oc

Mix 15-50oc

AQA

M HM

M MM


Fly ash contentFly ash contentCompressive Compressive

strengthstrengthSiOSiO22

NaNa22OOSodium silicateSodium silicate

Sodium hydroxide Sodium hydroxide

Applications

Development

Research

Raw materials


Thank you for your attentionThank you for your attention

Modeling of reaction kinetics in order to enable identification of the optimum parameters, such as desired content of the most important oxides in starting material, aging period. Development of models that define the ordering behavior of geopolymer framework and enable theoretical predictions comparable to experimental dataDurability studies under various and extreme environments.

60% Series 65% Series 70% Series

40oC

40oC

60% Series 65% Series 70% Series

Indicators

Technical- mechanical strength (quantitative)- resistance against acids (qualitative)- temperature resistance (quantitative)- setting time (quantitative)- workability (qualitative)- handling (qualitative)

Economy- raw material costs (quantitative)- costs of the thermal activation of raw materials

(qualitative)- costs of grinding raw materials (qualitative)- follow-up costs caused by slow setting (qualitative)

Largely amorphous material formed by reacting alumino-silicate minerals (Al3+ in IV-fold coordination) with highly alkaline and silicate solution atambient temperatures.Thermal activation is necessary to acquire of tetrahedral aluminates (Al3+ in IV-fold coordination).

Negative charge of aluminates tetrahedral is balanced by the presence of alkali metals cation.Process of setting - polycondensation differs from cement hardening.

Structure consists of tetrahedral aluminates and silicates units in different reciprocal ratio: basic structural units (-Si-O-Al-O- bonds).

Geopolymer:•1113 and 1030 cm-1: asymmetric Al-O and Si-O stretching

778 and 694 cm-1:•777 cm-1: Si-O-Si vibration•696 cm-1: vibration of tetrahedrons

Infrared Spectroscopy

Si AlO

O

OO

O

O

O

After short time gel hardens into a geopolymer

20 nm

0.20M10F65

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