Experimental Researches on Microstructure of Nanometer Silicon and Cement-Stabilized Soils

Abstract:

Unconfined compressive strength of various mixing proportions and ages of nanometer silicon and cement-stabilized soils（NCSS） are tested ,and the rules of compressive strength are got. Hydration products and microstructures of NCSS are discussed by means of XRD and SEM technology, and microstructural mechanisms of NCSS are analyzed. Results show that nanometer silicon powder added to cement-stabilized soil(CSS) can sharply improve the compressive strength of CSS. More Calcium silicate hydrates(C-S-H) and other hydration products can be produced in the process of secondary reaction of cement and water added nanometer silicon powder. X ray diffraction tests indicate the kinds and quantities of C-S-H increase with nanometer silicon contents. Strengths of NCSS are bettered by increasing jointed strength changed from edge-edge, edge-face connectios to cementation connections affected by increasing hydration products. Large pores of NCSS can be greatly decreased by adding nanometer silicon powder, and hydration products filling in the pores make NCSS more dense materials.

• Periodical: Applied Mechanics and Materials (Volumes 94-96)
• Pages: 358-364
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.94-96.358
• Online since: September 2011
• Authors: Li Feng Wang
• Keywords: Cement-Stabilized Soil, Microstructure, Nanometer

References

[1] Pietro Ubbriaco, Domentico Calabrese. Solidification and stabilization of cement paste containing fly ash from municipal solid waste. Thermochimica Acta, 1998,321, 143~160.

DOI: 10.1016/s0040-6031(98)00453-5

[2] Alper Sezer, Gozde Inan, H.Recep Yilmaz, Utilization of a very high lime fly ash for improvement of Izmir clay. Building and Environment ，2001 (41) ,150～155.

DOI: 10.1016/j.buildenv.2004.12.009

[3] AuroraAntermir，ColinD.Hills,Paula J.Carey.et.al Long-term performance of aged waste forms treated by stabilization/solidification. Journal of Hazardous Materials, 2010(181):65～73.

DOI: 10.1016/j.jhazmat.2010.04.082

[4] Zhou Guo-jun,Hu Tong-an,Liu Yun-zhao et.al. Reinforcing soft soils by technical of deep mixing methods[J].Chinese Journal of Geotechnical Engineering, 1981，4.

[5] Clough, G.W. Sitar,N.,Bachus R.C. and Rad N.S. Cement stands under static loading. J.Geotech. Engrg.Div. ASCE, 1981,107(6), 799～817.

DOI: 10.1061/ajgeb6.0001152

[6] Suksun Horpibulsuk, Runglawan Rachan, Avuirut Chinkulkijniwat et.al. Analysis of strength development in cement-stabilized silty clay from microstructural considerations. Construction and building materials. 2010(24):2011～2021.

DOI: 10.1016/j.conbuildmat.2010.03.011

[7] TomacI，Van Impe W F，Flores R D V，et a1．Binder．soil interaction in cement deep mixing through SEM analysis[C]f，Proceedings of the 16th International Co nference on Soil mechanics and Geotechnical Engineering．Rotterdam：Millpress Science Publishers，2005：1265～1268．

[8] ZHOU Jiyuan，HU Minghao．Microstructure and its hydrate of cement-soili,J]．Journal of Tongji University：Natural Science，1998，26(S1)：6．

[9] Wang Qing, Wang Feng-yan, Xiao Shu-fang, A quantiative study of the microstructure characteristics of soil and its appilication to the engineering.Journal of ChengDu university of technology. 2001 (26)2：148～153.

[10] HUANG Yu, ZHOU ZiZhou, Bo Jiong, et. Micro experiments in Cement-mixed Soils on a Dredger Fill of Soft Ground [J].Journal of Tongji University：Natural Science，2010，38：7，997～1001．

[11] WANG Li-feng. Study on engineering properties and elastic-plasticity constitutive model of soils stabilized with cement and nanometer silicon [D]. Hangzhou: Zhejiang University, 2003:85-90.

[12] Tan Luo-rong, Zhang Mei-ying, Shao Wu-min,et.al. Microstructure characteristic and engineering properties of expansive soil[J].Chinese Journal of Geotechnical Engineering, 1994，16：2，48～57.

[13] Zhu Pei-nan, Wei Zhei-pei, Wang Tian-Di, Microstructure of Ceramics, WuHan: Wuhan polytechnic university press，1994，12.

[14] Zhu Huo-guo, Wang Heng-zhi, Material science research and Test methods.Southeast University Press. NanJing, 2008,1.

[15] Xiao Li, Wang Chun-yi, Guo Han-sheng, Building material cement-stabilized soils. Water Conservancy and Electric Power Press, BeiJing, 1987,5。

[16] Li Zhu(translating ), Chemistry of Cement and Concrete, China Architecture and Building Press, BeiJing, 1980，8.