The role of calcium in blended fly ash geopolymers
Source abstract
Abstract
In this research effort, the role of calcium in geopolymers was investigated through a series of syntheses where a high-calcium fly ash was blended with a low-calcium fly ash. Increased calcium content led to accelerated set-up times, increased compressive strength, and increased product formation. Powder X-ray diffraction results showed the majority of that product to be geopolymer framework with only minor contributions from calcium silicate phases. Thermal analysis confirmed the absence of a calcium silicate hydrate phase. Analysis of fly ash dissolution showed that calcium aided in aluminosilicate dissolution and therefore the geopolymerization reaction. While aiding in this reaction, calcium became incorporated into the pore structure of the geopolymer as a counter-balancing cation, according to ion exchange experiments. Thus, geopolymer synthesis with increased calcium content through the use of a high-calcium fly ash under these experimental conditions produced a quick-setting, strong, calcium incorporated geopolymer material.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Nuclear materials and radiation effects · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (42)
Show source-provided references
1. Richardson IG (2008) The calcium silicate hydrates. Cem Concr Res 38:137–15810.1016/j.cemconres.2007.11.005 ↗
2. Provis JL, van Deventer JSJ (eds) (2009) Geopolymers: structure, processing, properties and industrial applications. Woodhead Publishing Ltd, Oxford
3. Yip CK, van Deventer JSJ (2003) Microanalysis of calcium silicate hydrate gel formed within a geopolymeric binder. J Mater Sci 38:3851–3860. doi: 10.1023/A:102590490517610.1023/A:1025904905176 ↗
4. Yip CK, Lukey GC, van Deventer JSJ (2005) The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation. Cem Concr Res 35:1688–169710.1016/j.cemconres.2004.10.042 ↗
5. Khale D, Chaudhary R (2007) Mechanism of geopolymerization and factors influencing its development: a review. J Mater Sci 42:729–746. doi: 10.1007/s10853-006-0401-410.1007/s10853-006-0401-4 ↗
6. Temuujin J, van Riessen A, Williams R (2009) Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes. J Hazard Mater 167:82–8810.1016/j.jhazmat.2008.12.121 ↗
7. Barbosa VFF, MacKenzie KJD, Thaumaturgo C (2000) Synthesis and characterisation of materials based on inorganic polymers of alumina and silica: sodium polysialate polymers. Int J Inorg Mater 2:309–31710.1016/S1466-6049(00)00041-6 ↗
8. Duxson P, Fernandez-Jimenez A, Provis JL, Lukey GC, Palomo A, van Deventer JSJ (2007) Geopolymer technology: the current state of the art. J Mater Sci 42:2917–2933. doi: 10.1007/s10853-006-0637-z10.1007/s10853-006-0637-z ↗
9. Guo X, Shi H, Dick WA (2010) Compressive strength and microstructural characteristics of Class C fly ash geopolymer. Cem Concr Compos 32:142–14710.1016/j.cemconcomp.2009.11.003 ↗
10. Kumar S, Kumar R, Mehrotra SP (2010) Influence of granulated blast furnace slag on the reaction, structure and properties of fly ash based geopolymer. J Mater Sci 45:607–615. doi: 10.1007/s10853-009-3934-510.1007/s10853-009-3934-5 ↗
11. Buchwald A, Hilbig H, Kaps C (2007) Alkali-activated metakaolin-slag blends—performance and structure in dependence of their composition. J Mater Sci 42:3024–3032. doi: 10.1007/s10853-006-0525-610.1007/s10853-006-0525-6 ↗
12. Lee WKW, van Deventer JSJ (2002) The effect of ionic contaminants on the early-age properties of alkali-activated fly ash-based cements. Cem Concr Res 32:577–58410.1016/S0008-8846(01)00724-4 ↗
13. Alonso S, Palomo A (2001) Alkaline activation of metakaolin and calcium hydroxide mixtures: influence of temperature, activator concentration and solids ratio. Mater Lett 47:55–6210.1016/S0167-577X(00)00212-3 ↗
14. Granizo ML, Alonso S, Blanco-Varela MT, Palomo A (2002) Alkaline activation of metakaolin: effect of calcium hydroxide in the products of reaction. J Am Ceram Soc 85:225–23110.1111/j.1151-2916.2002.tb00070.x ↗
15. Dombrowski K, Buchwald A, Weil M (2007) The influence of calcium content on the structure and thermal performance of fly ash based geopolymers. J Mater Sci 42:3033–3043. doi: 10.1007/s10853-006-0532-710.1007/s10853-006-0532-7 ↗
16. ASTM International (2012) Standard test method for compressive strength of hydraulic cement mortars. ASTM C109/C109M-12. ASTM International, West Conshohocken
17. Winburn RS (2003) Rietveld analysis of complex mixtures. What can we do? Adv X-Ray Anal 46:210–219
18. Winburn RS, Grier DG, McCarthy GJ, Peterson RB (2000) Rietveld quantitative X-ray diffraction analysis of NIST fly ash standard reference materials. Powder Diffr 15:163–17210.1017/S0885715600011015 ↗
19. Greenberg AE, Trussell RR, Clesceri LS (eds) (1985) Standard methods for the examination of water and wastewater. American Public Health Association, Washington, DC
20. Williams RP, van Riessen A (2010) Determination of the reactive component of fly ashes for geopolymer production using XRF and XRD. Fuel 89:3683–369210.1016/j.fuel.2010.07.031 ↗
21. Ban T, Okada K (1992) Structure refinement of mullite by the rietveld method and a new method for estimation of chemical composition. J Am Ceram Soc 75:227–23010.1111/j.1151-2916.1992.tb05473.x ↗
22. Fischer RX, Schneider H, Voll D (1996) Formation of aluminum rich 9:1 mullite and its transformation to low alumina mullite upon heating. J Eur Ceram Soc 16:109–11310.1016/0955-2219(95)00139-5 ↗
23. Deer WA, Howie RA, Zussman J (1992) An introduction to the rock-forming minerals. Longman Scientific and Technical, Essex
24. Davidovits J (2008) Geopolymer: chemistry & applications. Institut Geopolymere, Saint-Quentin
25. Bell JL, Sarin P, Driemeyer PE, Haggerty RP, Chupas PJ, Kriven WM (2008) X-ray pair distribution function analysis of a metakaolin-based, KAlSi2O 6 . 5·5H2O inorganic polymer (geopolymer). J Mater Chem 18:5974–598110.1039/b808157c ↗
26. White CE, Provis JL, Proffen T, van Deventer JSJ (2010) The effects of temperature on the local structure of metakaolin-based geopolymer binder: a neutron pair distribution function investigation. J Am Ceram Soc 93:3486–349210.1111/j.1551-2916.2010.03906.x ↗
27. Duxson P, Lukey GC, van Deventer JSJ (2007) The thermal evolution of metakaolin geopolymers: Part 2—phase stability and structural development. J Non Cryst Solids 353:2186–220010.1016/j.jnoncrysol.2007.02.050 ↗
28. Mazzi F, Galli E, Gottardi G (1976) The crystal structure of tetragonal leucite. Am Mineral 61:108–115
29. Skinner LB, Chae SR, Benmore CJ, Wenk HR, Monteiro PJM (2010) Nanostructure of calcium silicate hydrates in cements. Phys Rev Lett 104:195502-4–195502-1
30. Vedalakshmi R, Raj AS, Srinivasan S, Babu KG (2003) Quantification of hydrated cement products of blended cements in low and medium strength concrete using TG and DTA technique. Thermochim Acta 407:49–6010.1016/S0040-6031(03)00286-7 ↗
31. Subaer van Riessen A (2007) Thermo-mechanical and microstructural characterisation of sodium-poly(sialate-siloxo) (Na-PSS) geopolymers. J Mater Sci 42:3117–3123. doi: 10.1007/s10853-006-0522-910.1007/s10853-006-0522-9 ↗
32. van Deventer JSJ, Provis JL, Duxson P, Lukey GC (2007) Reaction mechanisms in the geopolymeric conversion of inorganic waste to useful products. J Hazard Mater A139:506–51310.1016/j.jhazmat.2006.02.044 ↗
33. Panagiotopoulou C, Kontori E, Perraki T, Kakali G (2007) Dissolution of aluminosilicate minerals and by-products in alkaline media. J Mater Sci 42:2967–2973. doi: 10.1007/s10853-006-0531-810.1007/s10853-006-0531-8 ↗
34. Chen C, Gong W, Lutze W, Pegg IL, Zhai J (2011) Kinetics of fly ash leaching in strongly alkaline solutions. J Mater Sci 46:590–597. doi: 10.1007/s10853-010-4997-z10.1007/s10853-010-4997-z ↗
35. Mikuni A, Komatsu R, Ikeda K (2007) Dissolution properties of some fly ash fillers applying to geopolymeric materials in alkali solution. J Mater Sci 42:2953–2957. doi: 10.1007/s10853-006-0530-910.1007/s10853-006-0530-9 ↗
36. Yip CK, Lukey GC, Provis JL, van Deventer JSJ (2008) Effect of calcium silicate sources on geopolymerisation. Cem Concr Res 38:554–56410.1016/j.cemconres.2007.11.001 ↗
37. Davidovits J (1991) Geopolymers: inorganic polymeric new materials. J Therm Anal 37:1633–165610.1007/BF01912193 ↗
38. Breck DW (1974) Zeolite molecular sieves. Wiley, New York
39. Weitkamp J, Puppe L (eds) (1999) Catalysis and zeolites: fundamentals and applications. Springer, Berlin
40. Karge HG, Weitkamp J (eds) (2002) Molecular sieves science and technology, vol. 3: post-synthesis modification I. Springer, Berlin
41. O’Connor SJ, MacKenzie KJD, Smith ME, Hanna JV (2010) Ion exchange in the charge-balancing sites of aluminosilicate inorganic polymers. J Mater Chem 20:10234–1024010.1039/c0jm01254h ↗
42. He P, Jia D, Wang M, Zhou Y (2010) Effect of cesium substitution on the thermal evolution and ceramics formation of potassium-based geopolymer. Ceram Int 36:2395–240010.1016/j.ceramint.2010.07.015 ↗