Abstract
Red clay generally has a high liquid limit and is easy to shrink due to water loss. It is easy to cause some engineering accidents. If red clay is used as subgrade filler, it must be studied. This paper studied the red clay properties of a highway in southwest China and improved the red clay by adding quicklime. Research results show that the red clay is high liquid limit soil and the CBR does not meet the specification requirement. It can’t be directly used as filler for highway. After improved by adding quicklime, the red clay changed from high liquid limit soil to non-high liquid limit soil and the CBR increased rapidly. In the supporting project, red clay was improved by adding 5% quicklime. Then the liquid limit and CBR of the modified red clay meet the specification requirements. And the red clay’s water loss cracking has also been greatly improved.
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