Journal
CANADIAN JOURNAL OF CIVIL ENGINEERING
Volume 43, Issue 10, Pages 865-874Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjce-2016-0052
Keywords
stabilized loess; freeze-thaw cycle; frost heaving; thaw shrinkage; microstructure; cement; lime; fly ash
Categories
Funding
- National Natural Science Foundation of China [51469001]
- Science and Technology Foundation of China Railway Construction Co., Ltd. [12-C32]
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Freeze-thaw action is considered to be one of the most destructive actions that can induce significant damage in stabilized subgrades in seasonally frozen loess areas. Laboratory tests including frost heave-thaw shrinkage and microstructure change during freeze-thaw cycles were conducted to evaluate the volume change rate of loess stabilized with cement, lime, and fly ash under the impact of cyclic freeze-thaw conditions. The loess specimens collapsed after eight freeze-thaw cycles (192 h), but most stabilized loess specimens had no visible damage after all freeze-thaw cycles were completed. All of the stabilized loess samples underwent a much smaller volume change than the loess alone after the freeze-thaw cycles. Although surface porosity and equivalent diameter of stabilized loess samples increased, the stabilized loess can retain its microstructure during freeze-thaw cycles when the cement content was less than 6%. To ensure freeze-thaw resistance of stabilized loess subgrades, the mix proportions of the three additives was recommended to be 4 to 5% cement, 6% lime, and 10% fly ash.
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