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Tribhuvan University Kathmandu, Nepal

International Conference on TIM, 2012, Nepal. Synthesis and Characterization of Geopolymer from Various Types of Construction Wastes. Arvind Pathak , Ambar B. Rangu Magar , Dipak Paudel , Rishi B. Bhandari and Vinay Kumar Jha Central Department of Chemistry

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Tribhuvan University Kathmandu, Nepal

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  1. International Conference on TIM, 2012, Nepal Synthesis and Characterization of Geopolymer from Various Types of Construction Wastes ArvindPathak, Ambar B. RanguMagar, DipakPaudel, Rishi B. Bhandari and Vinay Kumar Jha Central Department of Chemistry Institute of Science and Technology Tribhuvan University Kathmandu, Nepal

  2. International Conference on TIM, 2012, Nepal Abstract Construction wastes such as coal fly ash (CFA),demolished cement-sand-mixture (DCSM),demolished cement sand-concrete mixture (DCSCM), brick dust (BD) are rich sources of alumino-silicate and thus can be used as raw material for the synthesis of geopolymer. Geopolymers have been synthesized from construction wastes using alkali and alkali-silicate as activators. Geopolymerization can transform a wide range of alumino-silicate materials into building materials with excellent physicochemical properties such as fire, acid and earthquake resistant. Geopolymers have been synthesized from CFA, DCSM,DCSCM andBD of compressive strength 41.9, 47.0, 45.5 and 60.0MPa respectively.

  3. International Conference on TIM, 2012, Nepal Introduction Geopolymer is a class of synthetic aluminosilicate materials. It has a number of potential uses in several areas but predominantly as replacement of cement. The name “GEOPOLYMER” was first given to these materials by Prof. John Davidovits in 1970. The existence of geopolymer can be seen in Egypt’s famous Pyramids. Roman cement and small artifacts, which were previously thought to be stone, were made using the knowledge of geopolymer techniques.

  4. International Conference on TIM, 2012, Nepal Some Features of Geopolymer Precast structural pipes Paver Ceramics Concrete sleepers Land slide stabilization Hazardous waste encapsulation

  5. International Conference on TIM, 2012, Nepal Geopolymer and Portland cement

  6. International Conference on TIM, 2012, Nepal Geopolymer and Portland cement Hardening of Portland cement (P.C.) through simple hydration of calcium silicate into calcium di-silicate hydrate and lime Ca(OH)2. Hardening of Geopolymer resin (GP) through poly-condensation of potassium oligo-(sialate-siloxo) into potassium poly(sialate-siloxo) cross linked network.

  7. International Conference on TIM, 2012, Nepal Geopolymer and Portland cement

  8. International Conference on TIM, 2012, Nepal Objectives • To synthesize geopolymerfrom the construction waste with comparable compressive strength like ordinary cement materials. • To reduce the CO2 emission in the atmosphere. • To reduce the disposal problem of construction wastes.

  9. International Conference on TIM, 2012, Nepal Basic Mechanism of Geopolymerization Geopolymer Construction Waste Sodium Silicate Sodium Hydroxide Smaller particle size of construction waste, sodium silicate and higher content of alkali metals enhance the dissociation and dissolution of alumino-silicate and thereby the formation of geopolymer will have positive influence.

  10. International Conference on TIM, 2012, Nepal Geopolymer Structure Barbocaet al., 2000

  11. International Conference on TIM, 2012, Nepal Compressive Strength and XRD PatternMeasurements SLF 9 Load frame machine Bruker, D8 Advance Diffractometer

  12. International Conference on TIM, 2012, Nepal XRD-Patterns BD DCSCM DCSM

  13. International Conference on TIM, 2012, Nepal • Comp. Strength With NaOH Variation

  14. International Conference on TIM, 2012, Nepal Comp. Strength With Particle Size Variation

  15. International Conference on TIM, 2012, Nepal Comp. Strength With Na2SiO3/CW ratio

  16. International Conference on TIM, 2012, Nepal Comp. Strength With Curing Time Variation

  17. International Conference on TIM, 2012, Nepal Characterization of Geopolymer Products

  18. International Conference on TIM, 2012, Nepal Conclusion • The most suitable raw material for the synthesis of geopolymer is brick-dust. • Geopolymeric products of compressive strength more than 40 MPa was obtained with all types of construction wastes. Furthermore, with brick dust geopolymer of 60 MPa was achieved • Thus Produced geopolymer can provide better alternate for ordinary cement. • This will solve the problem of disposal and hence Geopolymers could turn construction waste into wealth.

  19. International Conference on TIM, 2012, Nepal • Associate Prof. Dr. Vinay Kumar Jha, Central Department of Chemistry, Tribhuvan University. • Nepal Academy of Science and Technology (NAST) for Ph.D. Fellowship and financial support (Project 2067/68). • Central Material Testing Laboratory, Institute of Engineering (IOE), Pulchowk Campus, Tribhuvan University, Kathmandu. • Assoc. Prof. Dr. Lalu Prasad Paudel, Head of Central Dept. of Geology, T. U., Kirtipur, Kathmandu for his valuable help in X-Ray diffraction measurement of samples. • Central Department of Chemistry, Tribhuvan University for providing me the necessary facilities to carry out my Doctoral study. • Organizing Committee and TIM Conference-2012 Team. Acknowledgements

  20. THANK YOU

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