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Engineering Performance and Its Mechanism of Expansive Soils Modified by Adjusted and Activated Steel-Slag

  • Jun Wu
  • Qianwen Liu
  • Yongfeng Deng
  • Qi Feng
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Steel slag, a kind of by-products of steel industry, is enormously produced, however, its re-usage was still limited for the mutative chemical compositions and the low cementation. In this investigation, the composition adjustment and activation of the steel slag were first carried out to improve the cementation and to form the optimal slag-based composite, where the controlling indexes of cement clinker were introduced. Hereafter, the composite was used to modify Hefei expansive soils for the application of embankment construction. The basic physical properties including free swelling rate (FSR), Compaction test and California bearing ratio (CBR) were conducted to understand the engineering performance and to clarify the mechanism of expansive soils modified by the slag-based composite. The results show that when the soil was modified by the composite, the expansion potential was obviously suppressed, and then the treated soil can satisfy the requirement when the composite incorporation ratio was more than 5%. Thereafter, the compaction and CBR of the modified expansive soils suggests the excellent performance when the composite incorporation ratio is more than 7%. The above findings improve the reuse efficiency of the steel slag, and propose a material for the modification of expansive soils.

Keywords

Steel slag Component adjustment and activation Modification of expansive soil Engineering performance 

Notes

Acknowledgements

This study is supported by the National Natural Science Foundation of China (Grant No. 41572280) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX17-0131).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Institute of Geotechnical Engineering, School of TransportationSoutheast UniversityNanjingChina
  2. 2.Department of Civil, Construction, and Environmental EngineeringNorth Carolina State UniversityRaleighUSA
  3. 3.School of Resources and Environmental EngineeringHefei University of TechnologyHefeiChina

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