为阐明不同养护条件下粉煤灰基地质聚合物的变形机制和合理评价地质聚合物中ASR安全性,分别研究了常温和38℃湿气养护(＞95％R.H.)、80℃1 mol/L NaOH溶液浸泡及150℃10％ KOH溶液压蒸等养护条件对粉煤灰基地质聚合物变形行为的影响,并采用XRD、SEM研究了产物的组成和微观结构.结果表明:地质聚合物试体在不同养护条件下的化学反应和变形显著不同；(1)无外碱介质介入时,地质聚合物试体在所测龄期内均收缩.升高温度可加快地质聚合反应速率,缩短地质聚合产物结构达到稳定的时间；(2)高温养护和外碱介入,促进地质聚合产物由凝胶向沸石转变,可补偿聚合过程伴随的收缩,甚至呈现总体膨胀.采用适于OPC体系的高温、高碱快速检测AAR的检测方法评价地质聚合物体系的碱集料反应时需考虑基体的变形.
参考文献
| [1] | Davidovits J .Geopolymers and geopolymeric new materials[J].Thermal Analysis,1989,35(02):429-441. |
| [2] | A.Palomo;M.W.Grutzeck .Alkali-activated fly ashes A cement for the future[J].Cement and Concrete Research,1999(8):1323-1329. |
| [3] | Behzad Majidi .Geopolymer technology, from fundamentals to advanced applications: a review[J].Materials technology,2009(2):79-87. |
| [4] | Duxson, P;Lukey, GC;Separovic, F;van Deventer, JSJ .Effect of alkali cations on aluminum incorporation in geopolymeric gels[J].Industrial & Engineering Chemistry Research,2005(4):832-839. |
| [5] | J.W. PHAIR;J.S.J. VAN DEVENTER .EFFECT OF SILICATE ACTIVATOR pH ON THE LEACHING AND MATERIAL CHARACTERISTICS OF WASTE-BASED INORGANIC POLYMERS[J].Minerals Engineering,2001(3):289-304. |
| [6] | P.Duxson;J.L.Provis;G.C.Lukey .~(39)K NMR of Free Potassium in Geopolymers[J].Industrial & Engineering Chemistry Research,2006(26):9208-9210. |
| [7] | D.M.Roy .Alkali-activated cements Opportunities and challenges[J].Cement and Concrete Research,1999(2):249-254. |
| [8] | A. Fernandez-Jimenez;F. Puertas .The alkali-silica reaction in alkali-activated granulated slag mortars with reactive aggregate[J].Cement and Concrete Research,2002(7):1019-1024. |
| [9] | I. Garcia-Lodeiro;A. Palomo;A. Fernandez-Jimenez .Alkali-aggregate reaction in activated fly ash systems[J].Cement and Concrete Research,2007(2):175-183. |
| [10] | Lee S T;Lee J H.Microstructural observations of fly ash-based geopolymer composites with different curing conditions[A].山东济南,2010 |
| [11] | Daniel L Y;Jay G S .Damage behavior of geopoymer composites exposed to elevated temperatures[J].Cement and Concrete Composites,2008,30:986-991. |
| [12] | 姚振亚,郑娟荣,刘丽娜.碱激发胶凝材料化学收缩或膨胀的试验研究[J].郑州大学学报(工学版),2008(04):69-72. |
| [13] | 朱强,卢都友,许涛,罗旌旺,刘永道,郑彦增.含白云石微粉粉煤灰基地质聚合物的力学性能及微观结构[J].硅酸盐学报,2011(04):690-696. |
| [14] | Pavel R .Effect of curing temperature on the development of hard structure of metakaolin-based geopolymer[J].Construction and Building Materails,2010,24:1176-1183. |
| [15] | Provis J L;Van D J S J .A conceptual model for solid-gel transformations in partially reacted geopolymeric systems[J].Ceram Transactions,2004,165:49-70. |
| [16] | LaRosa J L;Kwan S;Grutzeck M W .Zeolite formation in class F fly ash blended cement pastes[J].American Ceramic Society,1992,75:1574-1580. |
| [17] | Norihiro Murayama;Hideki Yamamoto;Junji Shibata .Mechanism of zeolite synthesis from coal fly ash by alkali hydrothermal reaction[J].International Journal of Mineral Processing,2002(1):1-17. |
| [18] | Tanaka H.;Matsumura S.;Hino R. .Formation process of Na-X zeolites from coal fly ash[J].Journal of Materials Science,2004(5):1677-1682. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%