全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

碱激发胶凝材料:早期成核、化学相演变和体系性能

DOI: 10.14062/j.issn.0454-5648.2015.10.15

Full-Text   Cite this paper   Add to My Lib

Abstract:

近些年,通过碱激发硅铝酸质材料形成聚合物水泥基材料的研究受到了广泛关注。由于在此聚合物胶凝体系中,硅铝质原料存在多样性,包括粉煤灰、矿渣、煅烧高岭石等,因此其原料化学性质在动力学和固相演变过程中起到非常重要的作用,并决定了最终产品的化学和物理性质。分析了原料化学组成对从溶解到最终水化产物性能的碱激发全过程的影响。并使用了包括X射线同步衍射分析在内的一系列分析技术对多种原料的无定形和沸石状结构进行了表征。研究了具有特定无定形SiO2/Al2O3比的钠铝硅酸盐沸石在Al2O3-SiO2-H2O凝胶中的结晶趋势,并基于可识别的三元相图中的组成结构,研究了钙离子和剩余阳离子种类的主要影响。讨论了不同体系的相组成和化学成分、物相转变、微观结构变化及其长期强度发展和耐化学性的关系。

References

[1]  DAVIDOVITS J. Properties of geopolymer cements [C]//AlkalineCements and Concretes, Kiev, Ukraine, 1994: 131–149.
[2]  SWADDLE T W. Silicate complexes of aluminium (III) in aqueoussystems[J]. Coord Chem Rev, 2001, 219/221: 665–686.
[3]  WENG L, SAGOE–CRENTSIL K, BROWN T. Speciation andhydrolysis kinetics of aluminates in inorganic polymer systems [C]//Geopolymer International Conference, Melbourne, Australia, 2002.
[4]  FeRNANDEZ–JIMENEZ A, PALOMO A. Composition andmicrostructure of alkali activated fly ash binder: effect of activator[J].Cem Concr Res, 2005, 35: 1984–1992.
[5]  DIAZ E I, ALLOUCHE E N, EKLUND S. Factors affecting thesuitability of fly ash as source material for geopolymers[J]. Fuel, 2010,89: 992–996.
[6]  DUXSON P, PROVIS J L. Designing precursors for geopolymercements[J]. J Am Ceram Soc, 2008, 91(12): 3864–3869.
[7]  STEVESON M, SAGOE-CRENTSIL K. Relationships betweencomposition, structure and strength of inorganic polymers Part 1metakolin-derived inorganic polymers[J]. J Mater Sci, 2005, 40:2023–2036 .
[8]  PALOMO A, BLANCO–VARELA M T, GRANIZO M L, et al.Chemical stability of cementitious materials based on metakaolin[J].Cem Concr Res, 1999, 29: 997–1004.
[9]  VaN JAARSVELD J G S, DEVENTER J S J, LUKEY G C. The effectof composition and temperature on the properties of fly ash andkaolinite- based geopolymers[J]. Chem Eng J, 2002, 89: 63–73.
[10]  VAN JAARSVELD J G S, VAN DEVENTER J S J, LUKEY G C. Thecharacterisation of source materials in fly ash-based geopolymers[J].Mater Lett, 2003, 57: 1272–1280.
[11]  CHINDAPRASIRT P, CHAREERAT T, HATANAKA S, et al.High-strength geopolymer using fine high-calcium fly ash[J]. J MaterCiv Eng (ASCE), 2011, 23: 264–270.
[12]  CHINDAPRASIRT P, DE SILVA P, SAGOE-CRENTSIL K, et al.Effect of SiO2 and Al2O3 on the setting[J]. J Mater Sci, 2012, 47(12):4876–4883.
[13]  DE SILVA P, SAGOE-CRENSTIL K, SIRIVIVATNANON V. Kineticsof geopolymerization: Role of Al2O3 and SiO2[J]. Cem Concr Res,2007, 37(5): 212–218 .
[14]  DE SILVA P, SAGOE-CRENSTIL K. Medium-term phase stability ofNa2O-Al2O3-SiO2-H2O geopolymer systems[J]. Cem Concr Res, 2008,38: 870–876 .
[15]  FLETCHER R A, MACKENZIE J D, NICHOLSON C L, et al. Thecomposition range of aluminosilicate geopolymers[J]. J Eur Ceram Soc,2005, 25: 1471–1477.
[16]  DE SILVA P S,GLASSER F P. Phase relations in metakaolin/calciumhydroxide/water system[J]. Cem Concr Res, 1993, 23: 627–639.
[17]  ATKINS M, GLASSER F P, JACK J J. Zeolite P in cements: itspotential for immobilizing toxic and radioactive waste species[J].Waste Management, 1995, 15: 127–135.
[18]  PROVIS J L, LUKEY G C, VAN DEVENTER J S J. Dogeopolymers actually contain nanocrystalline zeolites? Are-examination of existing results[J]. Chem Mater, 2005, 17:3075–3085.
[19]  BRECK D W. Zeolite Molecular Sieves: Structure, Chemistry andUse[M]. New York: John Wiley & Sons, 1974.
[20]  VALTCHEV V P, BOZHILOV K N. Transmission electron microscopystudy of the formation of FAU-type zeolite at room temperature[J]. JPhys Chem B, 2004,108: 15587–15598.
[21]  LAROSA J L, KWAN S, CRUTZECK M W. Zeolite formation in classF fly ash blended cement pastes[J]. J Am Ceram Soc, 1992, 75(6):1574–1580.
[22]  MURAYAMA N, YAMAMOTO H, SHIBATA J. Mechanism ofzeolite synthesis from coal fly ash by alkali hydrothermal reaction[J].Int J Miner Process, 2002,64: 1–17.
[23]  KRIVEN W M, GORDON M, BELL J L. Geopolymers:nanoparticulate, nanoporous ceramics made under ambientconditions[C]// Microscopy and Microanalysis ’04[A]. Proc. 62ndAnnual Meeting of the Microscopy Society of America, 2004, 10:404–405.
[24]  INADA M, EGUCHI Y, ENOMOTE N, et al. Synthesis of zeolite fromcoal fly ashes with different silica-alumina composition[J]. Fuel, 2005,84: 299–304.
[25]  HAJIMOHAMMADI A, PROVIS J L,VAN DEVENTER J S J. Effectof alumina release rate on the mechanism of geopolymer gelformation[J]. Chem Mater, 2010, 22(18): 5199–5208.
[26]  TEMUUJIN J, RIESSEN A V, WILLIAMS R. Influence of calciumcompounds on the mechanical properties of fly ash geopolymerpastes[J]. J Hazard Mater, 2009, 167: 82–88
[27]  YIP C K, LUKEY G C, VAN DEVENTER J S J. The coexistence ofgeopolymeric gel and calcium silicate hydrate at the early stage ofalkaline activation[J]. Cem Concr Res, 2005, 35: 1688–1697.
[28]  YIP C K, LUKEY G C, PROVIS J L, et al. Effect of calcium silicatesources on geopolymerisation[J]. Cem Concr Res, 2008, 38: 554–564.
[29]  GARCIA-LODEIRO I, PALOMO A, FERNA?NDEZ-JIME?NEZ A, etal. Compatibility studies between N-A-S-H and C-A-S-H gels. Studyin the ternary diagram Na2O-CaO-Al2O3-SiO2-H2O[J]. Cem Concr Res,2011, 41: 923–931.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133