为探明碱矿渣胶凝材料(AAS)固化核素Sr2＋后,固化体性能的变化.利用矿渣粉、水玻璃、水和 Sr (NO3)2制备了碱矿渣固化体,并研究了 Sr(NO3)2对AAS固化体结构和性能的影响.结果表明,Sr(NO3)2使得AAS固化体的结晶程度和水化放热均降低,延缓了浆体的凝结硬化；Sr2＋破坏了Si—O—Al基团的形成过程,阻碍了二次 C-S-H 的形成.Sr(NO3)2的掺入降低了AAS固化体的3 d抗压强度；但当 Sr2＋掺量小于0．4％时,AAS固化体的28 d抗压强度增加.
To explore the performance of the alkali-activated slag (AAS)solidified body with Sr2+.AAS solidi-fied body had been prepared using slag,water glass,water and strontium nitrate.The influence of strontium ni-trate on the microstructure and properties of AAS had been researched.The results showed that Sr(NO3 )2 de-creased the crystallization degree and hydration heat release of AAS,which made the setting and hardening process of AAS paste delay.This was because Sr2+ damaged the formation of Si—O—Al groups and C-S-H.The 3 d compressive strength of AAS decreased while Sr2+ presence.However,the 28 d compressive strength of AAS increased with less than 0.4wt% of Sr2+ addition.
参考文献
| [1] | Davidovits J .Geopolymer cements to minimise carbon-di-oxide greenhouse-warming[J].Ceramic transactions,1993,37:165-182. |
| [2] | 邱树恒,崔学民,韩要丛,刘海锋,周济.热处理对碱矿渣胶凝材料结构及介电性能的影响[J].功能材料,2008(07):1118-1121. |
| [3] | Davidovits J.Geopolymer chemistry and applications[M].France:Geopolymer Institute,2008 |
| [4] | Wang S D;Scrivener K L .Hydration products of alkali activated slag cement[J].Cement and Concrete Research,1995,25(3):561-571. |
| [5] | Luo Xin;Xu Jinyu;Bai Erlei;Li Weimin.Systematic study on the basic characteristics of alkali-activated slag-fly ash cementitious material system[J].Construction and Building Materials,2012:482-486. |
| [6] | Tantawy M A;El-Roudi A M;Salem A A .Immobiliza-tion of Cr(Ⅵ)in bagasse ash blended cement pastes[J].Construction and Building Materials,2012,30:218-223. |
| [7] | Q.Y. Chen;M. Tyrer;C.D. Hills .Immobilisation of heavy metal in cement-based solidification/stabilisation: A review[J].Waste Management,2009(1):390-403. |
| [8] | Jan Deja .Immobilization of Cr~(6+), Cd~(2+), Zn~(2+) and Pb~(2+) in alkali-activated slag binders[J].Cement and Concrete Research,2002(12):1971-1979. |
| [9] | Jianguo Zhang;John L. Provis;Dingwu Feng;Jannie S.J. van Deventer .Geopolymers for immobilization of Cr~(6+), Cd~(2+), and Pb~(2+)[J].Journal of hazardous materials,2008(2/3):587-598. |
| [10] | Puligilla S;Mondal P .Role of slag in microstructural development and hardening of fly ash-slag geopolymer[J].Cement and Concrete Research,2013,43:70-80. |
| [11] | Famy C;Scrivener K L;Atkinson A et al.Effects of an early or a late heat treatment on the microstructure and composition of inner CSH products of Portland cement mortars[J].Cement and Concrete Research,2002,32(2):269-278. |
| [12] | Panagiotopoulou C;Kontori E;Perraki T;Kakali G .Dissolution of aluminosilicate minerals and by-products in alkaline media[J].Journal of Materials Science,2007(9):2967-2973. |
| [13] | Goto S;Daimon M;Hosaka G et al.Composition and morphology of hydrated tricalcium silicate[J].Journal of the American Ceramic Society,1976,59(7-8):281-284. |
| [14] | Mandaliev, P.;Wieland, E.;D?hn, R.;Tits, J.;Churakov, S.V.;Zaharko, O. .Mechanisms of Nd(III) uptake by 11? tobermorite and xonotlite[J].Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry,2010(6):763-777. |
| [15] | Takuma Tsutsumi;Shunsuke Nishimoto;Yoshikazu Kameshima;Michihiro Miyake .Hydrothermal preparation of tobermorite from blast furnace slag for Cs~+ and Sr~(2+) sorption[J].Journal of hazardous materials,2014(Feb.15):174-181. |
| [16] | Duxson P;Provis J L;Lukey G C et al.Understanding the relationship between geopolymer composition,mi-crostructure and mechanical properties[J].Colloids and Surfaces A-Physicochemical and Engineering Aspects,2005,269(1):47-58. |
| [17] | Rees C A .Mechanisms and kinetics of gel formation in geopolymers[D].Melbourne:the University of Mel-bourne,2007. |
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