Parames Kamhangrittirong Center of Building Innovation and Technology

Building Technology Division Faculty of Architecture

Kasetsart University, THAILAND

Construction material development using fly ash based geopolymer

Construction material development using fly ash based geopolymer

Outline

Introduction

Experimental program

Results and discussion

Conclusions

Background Introduction

Lampang Province -Mae Moh

3,500,000 tons/year

Background

Construction materials

Geopolymer

WASTE

Introduction

Sustainable Development

Geopoly- merization

Materials

Oxide-mole ratios of reactant mixture

Molar ratio Value (Davidovits : 1982)

Na2O / SiO2

0.20-0.48

SiO2 / Al2O3

3.50-4.50

H2O / Na2O

10.0-25.0

Na2O / Al2O3

0.80-1.60

Materials

§  Fly ash produced by Mae Moh plant, §  Sodium hydroxide (10M) §  Sodium silicate solution (SiO2:Na2O = 3:1)

Component SiO2 Al2O3 CaO Fe2O3 Composition

(mass %) 32-38 20-24 16-19 14-16

Objectives

Introduction

1

Effect of alkali solution ratio (WR = 1.0-2.5)

3

Microstructure SEM / EDS Analysis

2

Compressive Strength

Weight Ratio of Na2SiO3 : NaOH < 0.50

Weight Ratio of Na2SiO3 : NaOH > 3.00

Experimental program

Mixture

0

100

200

300

400

500

600

700

Mix1 Mix2 Mix3 Mix4

FA Na2SiO3 NaOH + Sand 2000 (gm.)

5 cm.

10 c

m.

The geopolymer mortar was poured into mould and stored in the ambient temperature

Testing method

Compression test

Testing method Experimental

program

Compressive strength

At the ages of 1, 2, 4, 7, 28 and 90 days, specimens were taken from the storage room and tested for compressive strength.

Testing method Experimental

program

SEM/EDS

The small pieces of tested specimens were examined using scanning electron microscope (SEM)/energy dispersive X-ray (EDX) to determine the composition of products.

Results & discussion

Compressive strength

0

5

10

15

20

25

0 10 20 30 40 50 60 70 80 90Age (Days)

Com

pres

sine

stre

ngth

(MPa

)...

Mix-1

Mix-2

Mix-3

Mix-4

24.4

20.1

0

5

10

15

20

25

1.00 1.50 2.00 2.50

Com

pres

sine

stre

ngth

(MPa

)... 90 d.

28 d.

7 d.

4 d.

2 d.

1 d.

Na2SiO3/NaOH

Results & discussion Effect of alkali solution ratio

24.4 20.1

SEM/EDS Results &

discussion

(a) Fly ash [5000X] (a)  (b) Mix-1 [5000X]

(c) Mix-4 [5000X]

SEM/EDS Results &

discussion

Si/Al atomic ratio

2.64 - 2.85

Mix #4

Mix #4

Conclusions

Alkali solution

Fly ash from Mae Moh Plant

+

Geopolymer product

NaOH content

Compressive strength

Na2SiO3 content

Conclusions

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

Microstructure

Conclusions

Geopolymer mortar and OPC mortar immersed in sulfuric acid 5% after 120 days

OPC 8M Geopolymer

12M Geopolymer 10M Geopolymer

Applications

Development

Research

Raw materials

Conclusions

Thank you for your attention

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