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...

多种重金属离子共存下不同钙硅比C-S-H对Pb2+俘获及其稳定性

Keywords: C-S-H,Pb2+,多种离子共存,固化率

Full-Text   Cite this paper   Add to My Lib

Abstract:

通过溶液法合成不同钙硅比C-S-H凝胶,并借助X射线衍射(X-raydiffraction,XRD)、扫描电子显微镜(scanningelectronmicroscopy,SEM)、透射电子显微镜(transmissionelectronmicroscopy,TEM)、电感耦合等离子发射光谱(inductivelycoupledplasmaatomicemissionspectrometry,ICP-AES)等测试技术,研究了C-S-H凝胶对Pb2+的固化能力及其长期稳定性.研究结果表明:水化液相多种重金属离子共存下C-S-H对Pb2+俘获能力与Pb2+以单一离子存在时有较大差异;且C-S-H钙硅比不同,其对Pb2+俘获机制及俘获能力不同.水化液相中Pb2+的质量分数较低时,C-S-H对Pb2+俘获能力较高;水化液相中Pb2+的质量分数较高时,不同钙硅比C-S-H对Pb2+俘获能力存在明显区别,C-S-H对Pb2+俘获能力显著降低;而多种重金属离子共存时,C-S-H对Pb2+俘获能力有所增强.随水化龄期延长(约210d),不同钙硅比C-S-H对Pb2+俘获能力有不同程度变化.冻融循环作用对低钙硅比C-S-H对Pb2+固化能力有较大影响,且在冻融循环及氯盐侵蚀复合作用下,C-S-H凝胶对Pb2+俘获能力有显著降低.

References

[1]  IVEY D B, HEINMANM R B, NEUWIRTH M, et al. Electron microscopy of heavy metalin cement materials[J]. Journal Material Science Letters, 1990, 25(12):5055-5062.
[2]  HERRERA E. Evaluation of the leaching properties of solidified heavy metal wastes[J]. Journal of Environmental Science and Health, 1992, 983: 5055-998.
[3]  STEPHANA D, MALLMANNB R, KNOFELB D, et al.High intakes of Cr, Ni and Zn in clinker: part .influence on the hydration properties [ J]. Cement andConcrete Research, 1999, 29(10): 1959-1967.
[4]  兰明章. 重金属在水泥熟料煅烧和水泥水化过程中的行为研究[D]. 北京: 中国建筑材料科学研究总院水泥科学与新型建材料研究院, 2008.
[5]  LAN Ming-zhang. Behavior of heavy metals in cement clinker and cement hydration process [ D ]. Beijing: Cement Institute of Materials Science and New Building, China Building Materials Academy, 2008. (in Chinese)
[6]  THEVENIN G, PERA J. Interaction between lead and different binders[J]. Cem Concr Res, 1999, 29(10):1605-1610.
[7]  GINEYS N. Managing trace elements in Portland cement: part I. interactions between cement paste and heavy metals added during mixing as soluble salts [J].Cement and Concrete Composites, 2010, 32(8):563-570.
[8]  杨南如. C鄄S鄄H 凝胶结构模型研究新进展[J]. 南京化工大学学报, 1998, 20(2): 7884.
[9]  YANG Nanru. New research dvelopment of C0S-H mode[ J ]. Journal of Nanjing University of Chemical Technology, 1998, 20(2): 7884. (in Chinese)
[10]  KWAN S, THOMPSON J, GRUTZEDCK M W. Structure and phase relations of Aluminum substituted calcium silicate hydrate[J]. J Am Ceram Soc, 1996, 79 (4):967-971.
[11]  赵晓刚. 水化硅酸钙的合成及其组成、结构与形貌[D]. 武汉: 武汉理工大学材料科学与工程学院,2010.
[12]  ZHAO Xiao-gang. Synthesis and composition, structure and morphology of C-S-H [ D ]. Wuhan: College of Materials Science and Engineer, Wuhan University of Technology, 2010. (in Chinese) BLACKA L, GARBEVA K, STEMME R P, et al. Characterisation of crystalline C-S-H phases by X-ray photoelectron spectroscopy [J]. Cement and Concrete
[13]  Research, 2003, 33(9): 899-911.
[14]  TAYLOR H F W. Cement chemistry [ M]. London: Academic Press, 1990: 142-152.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133