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Geopolymer Concrete


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Mr. Mohammad Akbar, who is a BBS Engineer at Manomav, shared his thoughts on Geopolymer concrete which is an innovative, eco-friendly construction material. In his presentation, he covered the advantage of using GPC Concrete over OPC.

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  • This PPT is copied from Vibhanshu Singh, Assistant Manager in Delhi Metro Rail Corporation DEC 2016 PRESENTATION.
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Geopolymer Concrete

  1. 1. PRATHAM “Geopolymer Concretr ” Akbar MEET NUMBER Twelve On 23rd May 2018 at c/o The Entrepreneurship School, O-113, Arjun Market, Block E, DLF Phase 1, Sector 26A, Gururgram, Haryana 122002
  3. 3. INTRODUCTION • Geopolymer concrete is an innovative, eco-friendly construction material. • It is used as replacement of cement concrete. • In geopolymer concrete cement is not used as a binding material. • Fly ash, silica-fume, along with alkali solution are used as binders.
  4. 4. WHY NOT OPC? • It is the most consumed commodity in the world after water. • It is also the most energy intensive material • Cement production leads to high carbon-dioxide emission. -1 ton of CO2 is produced for every 1 ton of cement. -It is produced by calcination of limestone and burning of fossil fuels
  5. 5. WHY GEOPOLYMER CONCRETE? • Reduces the demand of OPC which leads CO2 emission. • Utilise waste materials from industries such as fly ash, silica-fume. • Protect water bodies from contamination due to fly ash disposal. • Conserve acres of land that would have been used for coal combustion products disposal. • Produce a more durable infrastructure.
  6. 6. CONSTITUENTS • Coarse aggregate • Fine aggregate - sand or bottom ash can be used • Admixture - superplasticizers(naphthalene based or naphthalene sulphonate based) • Alkaline activators -It produce a paste which sets and hardens within short duration
  7. 7. Fly ash -combustion by-product of coal in coal fired power plants -two classes of fly ash are F and C TABLE1:CHEMICAL COMPOSITION OFFLYASH. OXIDES PERCENTAGE SiO2 52 Al2O3 33.9 Fe2O3 4 CaO 1.2 K2O 0.83 Na2O 0.27 MgO 0.81 SO3 0.28 LOI 6.23 SiO2/Al2O3 1.5
  8. 8. Time(days) • STRENGTH • COMPRESSIVE STRENGTH -higher compressive strength when heat activated -slag addition improves compressive strength at ambient temperature curing
  9. 9. • compressive strength of GPC decreased with increasing fly ash content • it increased with higher aggregate content • higher strength at lower alkali content • compressive strength increased with age • Polycondensation of silica and alumina contribute to high strength
  10. 10. PROPERTIES • Workability -increase in NaOH and sodium silicate solution reduce flow of mortar -superplasticizer or extra water can be added to increase workability • Compressive strength -it depends on curing time and temperature -it increase with fly ash content -it increase with fineness of fly ash
  11. 11. • Resistance against aggressive environment -used in constructing marine structures -in OPC white layer of crystals formed on acid exposed surface not in GPC. -GPC showed better resistance.
  12. 12. • Behaviour of geopolymer at elevated temperature -high strength loss during early heating period(up to 200οC) -beyond 600οC no further strength loss -no visible cracks up to 600οC -minor cracks at 800οC • Bond strength -very high -about one third of its compressive strength -four times than that of OPC
  13. 13. ADVANTAGES high compressive strength high tensile strength low creep low drying shrinkage resistant to heat and cold chemically resistant highly durable fire proof
  14. 14. DISADVANTAGES difficult to create -requires special handling -chemicals like sodium hydroxide are harmful to humans -high cost of alkaline solution Pre-mix only -sold only as pre-mix or pre-caste material Geopolymerisation process is sensitive -lacks uniformity
  15. 15. DISCUSSION ON FUTURE DEVELOPMENT -more studies and wide scale acceptance for using GPC in precast concrete products -making GPC more user friendly by using lower amount of alkaline solution -producing more cost effective geopolymer -replacing fine aggregate with quarry sand as demand for natural sand is increasing -studies on fibre reinforced geopolymer concrete for improving flexural strength
  16. 16. CONCLUSION • Geopolymer concrete is a promising construction material due to its low carbon dioxide emission • High early strength, low creep and shrinkage, acid resistance, fire resistance makes it better in usage than OPC. • Enhanced research along with acceptance required to make it great advantage to the industry
  18. 18. THANKS For any Project Management and Engineering Consultancy Connect us at +91-120-4356006 or We are specialized in Latest Construction Monitoring Technologies, Building Information Modeling (BIM), Quantity Surveying (QS), Bar Bending Schedule (BBS), Cost; Quality; & Scheduling Audits, Material Management Software, 3D Walkthroughs, Training on Primavera/MS Project, and Home Inspection (Icons designed by