首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
粉煤灰表面改性及其对水泥浆体强度和自收缩的影响
作者:郝成伟1 2 邓敏1 莫立武1 刘开伟1 
单位:1. 南京工业大学材料科学与工程学院 材料化学工程国家重点实验室 南京210009 2. 皖西学院建筑与土木工程系 安徽 六安 237012 
关键词:粉煤灰 白云石 自收缩 表面改性 强度 界面 
分类号:TU528
出版年,卷(期):页码:2011,39(4):145-150
DOI:
摘要:

研究了白云石对Ⅲ级粉煤灰表面改性,并测定了掺改性粉煤灰水泥浆体的自收缩和抗压强度。利用X射线衍射、扫描电镜和能谱分析等测试方法对经950 ℃煅烧1 h后改性粉煤灰的物相结构和化学组成进行了表征,通过背散射扫描电镜观察和压汞试验研究了掺改性粉煤灰水泥浆体的微观结构。结果表明:改性粉煤灰颗粒表面生成了具有水化活性的β-C2S,其水化产生C-S-H凝胶,明显改善水泥浆体中粉煤灰颗粒与水泥基体的界面,降低水泥浆体孔隙率,提高改性粉煤灰水泥浆体的早期强度。白云石分解的MgO水化产生膨胀,补偿水泥浆体自收缩。

how to cheat women who want to cheat wife cheat story
read read here link
open reasons why married men cheat My husband cheated on me
sumatriptan side effects sumatriptan side effects sumatriptan side effects
cialis discount coupons cialis 2015 coupon

The surface of Grade Ⅲ fly ash particles was modified via addition of dolomite and calcination at 950 ℃ for 1 h. The microstructure, mineral phase and chemical compositions of the modified fly ash were analyzed by X-ray diffraction (XRD), scanning electron microscope and energy dispersive spectrometer. In addition, the effect of modified fly ash on the autogenous shrinkage and compressive strength of cement pastes was investigated, and the microstructure of cement pastes was determined by mercury intrusion porosimetry and back scattered electron microscope. The results show that the β-C2S phases were formed on the surface of fly ash particles after the surface modification. Due to the hydration of β-C2S, the porosity of cement pastes with the modified fly ashes was decreased, and the early strength of fly ash cement pastes was increased. The hydration of MgO due to the decomposition of dolomite can generate the expansion, leading to the compensation of the autogenous shrinkage of cement paste.

redirect husband cheated unfaithful husband
redirect unfaithful spouse why women cheat on men they love
My wife cheated on me read reasons married men cheat
abortion pill abortion pill abortion pill
基金项目:
国家“973”计划(2009CB623105)项目资助。
作者简介:
博士研究生,副教授
why women cheat on husbands link link
open reasons why married men cheat My husband cheated on me
abortion las vegas abortion clinics in the bronx abortion pictures
参考文献:

[1] AHMARUZZAMAN M. A review on the utilization of fly ash [J]. Prog Energy Combust Sci, 2010, 36(3): 327-363. [2] CAO C, SUN W, QIN H G. The analysis on strength and fly ash effect of roller-compacted concrete with high volume fly ash [J]. Cem Concr Res, 2000, 30(1): 71-75. [3] 张文生, 陈益民, 欧阳世翕. 粉煤灰与水泥熟料共同水化硬化的基础研究进展及评述[J]. 硅酸盐学报, 2000, 28(2): 160-164. ZHANG Wensheng, CHEN Yimin, OUYANG Shixi. J Chin Ceram Soc (in Chinese), 2000, 28(2): 160-164. [4] BENTZ D P, CHIARA F F. Rheology and setting of high volume fly ash mixtures [J]. Cem Concr Compos, 2010, 32(4): 265-270. [5] BENTZ D P, PELTZ M A. Reducing thermal and autogenous shrinkage contributions to early-age cracking [J]. ACI Mater J, 2008, 105(4): 414-420. [6] 安明喆, 朱金铨, 覃维祖, 等. 粉煤灰对高性能混凝土早期收缩的抑制及其机理研究[J]. 中国铁道科学, 2006, 27(4): 27-31. AN Mingzhe, ZHU Jinquan, QIN Weizu, et al. Chin Railway Sci (in Chinese), 2006, 27(4): 27-31. [7] OLE M, JENSEN, PER F, et al. Autogenous deformation and RH-change in perspective [J]. Cem Concr Res, 2001, 31(12): 1859-1865. [8] MEDDAH M S, AREZKI T H. Pore structure of concrete with mineral admixtures and its effect on self-desiccation shrinkage [J]. ACI Mater J, 2009, 106(3): 241-250. [9] 杨南如. 充分利用资源开发新型胶凝材料[J]. 建筑材料学报, 1998, 1(1): 19-25. YANG Nanru. J Build Mater (in Chinese), 1998, 1(1): 19-25. [10] FAN Y M, YIN S H, WEN Z Y, et al. Activation of fly ash and its effects on cement properties [J]. Cem Concr Res, 1999, 29(4): 467- 472. [11] KURODA M, WATANABE T, NARIAKI T. Increase of bond strength at interfacial transition zone by the use of fly ash [J]. Cem Concr Res, 2000, 30(2): 253-258. [12] 沈威. 水泥工艺学[M]. 武汉: 武汉理工大学出版社, 1991: 192-194. SHEN Wei. Cement Technology (in Chinese). Wuhan: Wuhan University of Technology Press, 1991: 192-194. [13] 施惠生, 方泽锋. 粉煤灰对水泥浆体早期水化和孔结构的影响[J]. 硅酸盐学报, 2004, 32(1): 95-98. SHI Huisheng, FANG Zefeng. J Chin Ceram Soc (in Chinese), 2004, 32(1): 95-98. [14] HUA C, ACKER P, EHRLACHER A. Analyses and models of the autogenous shrinkage of hardening cement paste I. Modelling at macroscopic scale [J]. Cem Concr Res, 1995, 25(7): 1457-1468. [15] XU L L, DENG M. Dolomite used as raw material to produce MgO- based expansive agent [J]. Cem Concr Res, 2005, 35(8): 1480-1485. [16] MO L W, DENG M, TANG M S. Effects of calcination condition on expansion property of MgO-type expansive agent used in cement-based materials [J]. Cem Concr Res, 2010, 40(3): 437-446. [17] 朱玉峰. 粉煤灰的表面改性和改性粉煤灰水泥[J]. 硅酸盐学报, 1989, 17(2): 82-87. ZHU Yufeng. J Chin Ceram Soc (in Chinese), 1989, 17(2): 82-87.

my wife cheated on me now what men and women husband cheat
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com