|Table of Contents|

[1] Zhao Li, Guo Xinli, Ge Chuang, et al. Preparation and activity research of ecological nano mineraladmixture from rice husk charcoal [J]. Journal of Southeast University (English Edition), 2016, 32 (3): 368-372. [doi:10.3969/j.issn.1003-7985.2016.03.018]
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Preparation and activity research of ecological nano mineraladmixture from rice husk charcoal()
稻壳炭生态纳米矿物掺和料的制备及活性研究
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
32
Issue:
2016 3
Page:
368-372
Research Field:
Materials Sciences and Engineering
Publishing date:
2016-09-20

Info

Title:
Preparation and activity research of ecological nano mineraladmixture from rice husk charcoal
稻壳炭生态纳米矿物掺和料的制备及活性研究
Author(s):
Zhao Li1, 2, Guo Xinli1, 2, Ge Chuang1, 2, Guo Liping1, 3, Shu Xin4, Liu Jiaping1, 3, 4
1School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China
3 Jiangsu Key Laboratory of Civil Engineering Materials, Southeast University, Nanjing 211189, China
4 Jiangsu Subote New Material Co., Ltd., Nanjing 211103, China
赵丽1, 2, 郭新立1, 2, 葛创1, 2, 郭丽萍1, 3, 舒鑫4, 刘加平1, 3, 4
1东南大学材料科学与工程学院, 南京 211189; 2东南大学江苏省先进金属材料重点实验室, 南京 211189; 3东南大学江苏省土木工程材料重点实验室, 南京 211189; 4江苏苏博特新材料股份有限公司, 南京 211103
Keywords:
ecological nano mineral admixture;  rice husk charcoal(RHC);  rice husk ash(RHA);  SiO2 nanoparticles;  pozzolanic activity
生态纳米矿物掺和料;  稻壳炭;  稻壳灰;  纳米SiO2;  火山灰活性
PACS:
TU526
DOI:
10.3969/j.issn.1003-7985.2016.03.018
Abstract:
The rice husk ash(RHA)and silica(SiO2)nanoparticles are prepared from rice husk charcoal(RHC)by the methods of ventilated calcining and chemical precipitation, respectively, to remove the residual carbon which is harmful to cement composites. The structures and morphologies of these products are investigated by the Fourier transform infrared spectroscopy, X-ray diffraction, scanning/transmission electron microscopy and N2 adsorption-desorption analyzer. The results show that the as-produced RHA and SiO2 nanoparticles exist in amorphous phase without residual carbon, and exhibit porous structures with specific surface areas of 170.19 and 248.67 m2/g, respectively. The micro particles of RHA are aggregated by numerous loosely packed SiO2 gel particles with the diameter of 50 to 100 nm. The SiO2 nanoparticles are well dispersed with the average size of about 30 nm. Both the RHA and SiO2 nanoparticles can significantly reduce the conductivity of saturated Ca(OH)2 solution and increase the early strength of the cement composites. They also exhibit high pozzolanic activity, indicating that they can be used as ecological nano mineral admixtures.
为了去除稻壳炭中对水泥基材料有害的残留炭, 分别采用通风煅烧和化学沉淀的方法得到稻壳灰(RHA)和纳米SiO2; 采用红外、X射线衍射、扫描/透射电子显微镜和氮吸附-脱附研究了2种产物的结构和形貌.结果表明:RHA和纳米SiO2均为无定形结构, 残留炭已基本去除;它们呈多孔结构, 比表面积分别为179.19和248.67 m2/g;RHA微米级颗粒是由50~100 nm的SiO2凝胶粒子疏松聚集而成;纳米SiO2平均粒径为30 nm, 分散良好;RHA和纳米SiO2可显著降低饱和氢氧化钙溶液的电导率, 增强水泥基复合材料的早期强度, 显示出较高的火山灰活性, 可作为生态纳米矿物掺和料.

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Memo

Memo:
Biographies: Zhao Li(1987—), female, graduate; Guo Xinli(corresponding author), male, doctor, professor, guo.xinli@seu.edu.cn.
Foundation items: The Key Program of the National Natural Science Foundation of China(No.51438003), the National Basic Research Program of China(973 Program)(No.2015CB655105).
Citation: Zhao Li, Guo Xinli, Ge Chuang, et al. Preparation and activity research of ecological nano mineral admixture from rice husk charcoal[J].Journal of Southeast University(English Edition), 2016, 32(3):368-372.DOI:10.3969/j.issn.1003-7985.2016.03.018.
Last Update: 2016-09-20