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Materials 2018, 11(6), 1014; https://doi.org/10.3390/ma11061014

Stabilization of Loess Using Nano-SiO2

1
MOE Key Laboratory of Mechanics on Disaster and Environment in Western China, Department of Geological Engineering, Lanzhou University, Lanzhou 730000, China
2
Research Center on Landslides, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
3
Department of Geological Engineering, Chang’an University, Xi’an 710054, China
*
Authors to whom correspondence should be addressed.
Received: 20 May 2018 / Revised: 10 June 2018 / Accepted: 13 June 2018 / Published: 14 June 2018
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Abstract

Improving the performance of loess is of significant importance for lowering its collapsibility and water sensitivity to construction requirements and for geohazard mitigation. The present paper studies the changes in mechanical, structural, and mineralogical properties of nano-SiO2-treated loess with different contents and curing days. The mechanical behavior was examined by unconfined compressive strength (UCS) of untreated and treated loess. To better understand the mechanisms of stabilization, particle size distributions, scanning electron microscope (SEM) images, and X-ray diffraction (XRD) analyses were carried out. The results show that the UCS increase with increasing contents and curing days due to nano-SiO2 addition produced coarser particles, denser packing, and smaller pores in treated loess. The changes in the properties can be attributed to the formation of aggregation and agglomeration, with greater particle sizes and more interparticle contact. In addition, the results from mineralogical component analysis further confirm that physical structure modification controls the changes in mechanical and fabric properties, rather than chemical component alteration. Even small nano-SiO2 additions can also provide great improvement when curing days are enough for the treated loess. These findings reveal that nano-SiO2 has the potential to serve as a cost-effective stabilized additive that treats the universal loess. View Full-Text
Keywords: loess; nano-SiO2; strength enhancement; structure modification loess; nano-SiO2; strength enhancement; structure modification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kong, R.; Zhang, F.; Wang, G.; Peng, J. Stabilization of Loess Using Nano-SiO2. Materials 2018, 11, 1014.

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