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Funct. Mater. 2019; 26 (1): 216-220.

doi:https://doi.org/10.15407/fm26.01.216

Effect of nano-SiO2 and lime on characteristics and mechanical properties of coastal clay

Wentao Shang1,2, Zhong Liu3, Yuqin Gao3

1Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
2College of Architectural Engineering, Binzhou University, Binzhou, China
3Yellow River Institute of Hydraulic Research, YRCC, Shunhe Road, Zhengzhou, China

Abstract: 

In this study, the effect of nano-SiO2 and lime on the characteristics and mechanical properties of coastal clay were investigated. The California bearing ratio (CBR) test and hydraulic conductivity tests were performed to investigate the improved coastal clay strength and hydraulic parameters. The clay specimens were prepared in 5 groups: unmixed, mixed with 3 % lime, 5 % lime, 3 % lime + 1.5 % nano-SiO2 and 5 % lime + 3 % nano-SiO2. The results show that the cementation of nano-SiO2 and lime leads to larger CBR values and lower permeability of the coastal clay. Scanning electron microscopy reveals that nano-SiO2 particles fill in the interspace between lime particles or gel pores, with the diameters of capillary pores and micro-pores reduced.

Keywords: 
coastal clay, nano-SiO<sub>2</sub>, lime, mechanical properties, improvement.
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