Early hydration of composite cement with thermal activated coal gangue

被引：0

作者：

Wei Guo

Jianping Zhu

Dongxu Li

Jianhua Chen

Nanru Yang

机构：

[1] Yancheng Institute of Technology,Department of Material Engineering

[2] Nanjing University of Technology,Institute of Material Science and Engineering

[3] Changshu Institute of Technology,Department of Chemistry and Materials Engineering

来源：

Journal of Wuhan University of Technology-Mater. Sci. Ed. | 2010年 / 25卷

关键词：

blended cement; hydration; microstructure; hydration product;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Composite cement samples were prepared by mixing clinker, gypsum with burnt coal gangues which was calcined at various temperatures. The mechanical strength and Ca(OH)2 content in the cement paste were tested, and the paste composition and microstructure were analyzed by thermogravimetry-differential thermal analysis (TG-DSC), X-ray diffraction(XRD), scanning electronic microscopy (SEM) and pore structure analysis. Results demonstrate that the thermal activated coal gangue could accelerate the early hydration of cement clinker obviously, which promotes the gangue hydration itself. The early hydrated products of the cement are C-S-H gel, Ca(OH)2 and AFt. The cement with 30% (in mass) the gangue exhibits higher mechanical strength, and among all the cement samples the one with the gangue burnt at 700 °C displays the highest hydration rate, mechanical strength, the most gel pores and the lowest total porosity.

引用

页码：162 / 166

页数：4

共 27 条

[1] Song X. Y.(2004)Study on Structural Characteristic and Mechanical Property of Coal Gangue in Activation Process[J] J. Chin. Ceram. Soc. 32 358-363
[2] Gong C. C.(2005)Effect of Mechanical Grinding on Particle Size Distribution and Strength of Coal Gangue Cement System[J] J. Southeast. Univ. 35 168-171
[3] Li D. X.(2004)The Characteristics of Ions Dissolving-out and Structural Change of Calcined Coal Gangue in Alkaline Solutions[J] J. Chin. Ceram. Soc. 32 1 229-1 234
[4] Gu B. W.(1999)The Effect of Thermal and Mechanical Treatments on Kaolinite: Characterization by XPS and IEP Measurements[J] J. Colloid and Interface Sci. 215 339-344
[5] Wang P. M.(2001)Si and Acta Mineralogical Sinica 21 448-452
[6] Xiong S. B.(2001)Al Mas/NMR Study of the Thermal Transformation of Kaolin[J] Appl. Clay. Sci. 20 73-80
[7] Guo W.(1999)Thermal Treatment of Kaolin: The Effect of Mineralogy on the Pozzolanic Activity[J] Geochimica et Cosmochimica Acta. 63 3 261-3 275
[8] Li D. X.(2003)Mechanism of Kaolinite Dissolution at Room Temperature and Pressure, Part II: Kinetic Study[J] Cem. Concr. Res. 33 405-416
[9] Yang N. R.(2003)The Effect of Dehydroxylation/amorphization Degree on Pozzolanic Activity of Kaolinite[J] J. Chin. Ceram. Soc. 31 801-805
[10] Sa’nchez R. M. T.(1984)Metakaolin and Its Application in High Performance Concrete[J] J. Chin Ceram Soc. 12 157-16

← 1 2 3 →