Experimental Study on Dredged Material Improvement for Highway Subgrade Soil

Large amount of sediments are dredged from rivers and lakes as a result of environmental dredging in China. These dredged materials (DM) have poor geotechnical properties and are normally treated as wastes. On the other hand, there is a huge demand of sub-grade materials due to the increasing number of highway construction projects in the eastern China. Thus the reuse of the DM as sub-grade material may be considered as an environmental-friendly and economical option. In this study a dredged material taken from Tai-hu lake was modified by adding fine sand, quicklime and Portland cement. Water content, Atterberg limits, and California bearing ratio (CBR) of the modified soil were determined. Test results show that fine sand significantly decreases the plasticity of the modified soil and increases its workability. However, a great amount of sand is required to meet the standard for a highway sub-grade material, which increases substantially the volume of the modified soil and the cost. Quicklime evidently decreases the water content and plasticity of the modified soil, and improved significantly its mechanical behavior. When the amount of quicklime and cement are equal, cement modified soil has larger CBR strength than that of quicklime modified soil. Test results also indicate that less amount of cement is required to meet the highway standard than that of using quicklime.

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• Corporate Authors:

  American Society of Civil Engineers

  Geo-Institute
  Reston, VA  United States  20191-4400
• Authors:
  • Huang, Yinghao
  • Zhu, Wei
  • Zhang, Chunlei
  • Wang, Suncai
  • Zhang, Nan
• Conference:
  • GeoShanghai 2010 International Conference
  • Location: Shanghai , China
  • Date: 2010-6-3 to 2010-6-5
• Publication Date: 2010

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 335-340
• Monograph Title: Paving Materials and Pavement Analysis

Subject/Index Terms

• TRT Terms: Atterberg limits; California bearing ratio; Dredged materials; Geotechnical engineering; Moisture content; Subgrade (Pavements); Wastes
• Geographic Terms: China
• Subject Areas: Geotechnology; Highways; Materials; Pavements; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01207014
• Record Type: Publication
• ISBN: 9780784411049
• Files: TRIS
• Created Date: Oct 13 2010 2:53PM