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Advances in Materials Science and Engineering
Volume 2016, Article ID 9624974, 8 pages
Research Article

Properties of Crushed Red-Bed Soft Rock Mixtures Used in Subgrade

1School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
2Anhui Key Laboratory of Civil Engineering and Materials, Hefei, Anhui 230009, China
3School of Urban Construction, Yangtze University, Jingzhou 434023, China

Received 4 January 2016; Accepted 6 December 2016

Academic Editor: Carlo Santulli

Copyright © 2016 Huayan Yao 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.


Slaking red-bed soft rocks are widely distributed in the south of Anhui Province, China, and several highways will go through this area. It is important to evaluate their physical and mechanical characteristics for the purpose of using this kind of soft rocks as materials for road construction. In this paper, the compacting tests, the resilient modulus tests, the California bearing ratio (CBR) tests, and permeability tests have been carried out on crushed red-bed soft rock mixtures. The test results showed that, for a given degree of compaction, the resilient modulus decreases linearly with the increase of moisture content. For a given moisture content, the resilient modulus and CBR values increase linearly with the increase of compaction degree, while the soaking swelling, water absorption capacity, and permeability coefficient decrease linearly. In other words, the strength and water stability are enhanced with the increase of the degree of compaction. The results demonstrate that the crushed red-bed soft rock mixtures can be directly used as materials for the highway construction by taking corresponding measures.