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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 5767103, 11 pages
https://doi.org/10.1155/2017/5767103
Research Article

Experimental Research on Foamed Mixture Lightweight Soil Mixed with Fly-Ash and Quicklime as Backfill Material behind Abutments of Expressway Bridge

1Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Jiangsu Research Center for Geotechnical Engineering Technology, Institute of Tunnel and Underground Engineering, Hohai University, Nanjing, China
2Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Jiangsu Research Center for Geotechnical Engineering Technology, Geotechnical Research Institute, Hohai University, Nanjing, China

Correspondence should be addressed to Xin Liu; nc.ude.uhh@001nixuil

Received 24 December 2016; Revised 16 February 2017; Accepted 9 March 2017; Published 23 March 2017

Academic Editor: Xiao-Yong Wang

Copyright © 2017 Xin Liu et al. 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.

Abstract

To promote the utilization of fly-ash, based on the orthogonal experiment method, wet density and unconfined compressive strength of Foamed Mixture Lightweight Soil mixed with fly-ash and quicklime (FMLSF) are studied. It is shown that the wet density and unconfined compressive strength of FMLSF increase with the increase of cement content, while decreasing with the increase of foam content. With the mixing content of fly-ash increase, the wet density and unconfined compressive strength of FMLSF increase firstly and then decrease. Scanning Electron Microscope (SEM) tests show that ball effect or microaggregate effect of fly-ash improves the wet density and unconfined compressive strength of FMLSF. With the mixing content of quicklime increase, the wet density and unconfined compressive strength of FMLSF increase firstly within a narrow range and then decrease. In addition, the primary and secondary influence order on wet density and 28-day compressive strength of FMLSF are obtained, as well as the optimal mixture combination. Finally, based on two abutments in China, behind which they are filled with FMLSF and Foamed Mixture Lightweight Soil (FMLS), the construction techniques and key points of quality control behind abutment are compared and discussed in detail, and the feasibility of utilization fly-ash as FMLSF is verified by the experimental results.