Bimodal characters of compaction curve of lime treated expansive soil

Silt content increases significantly during the experiments of lime treated expansive soil.When the wet method is adopted,the soil maintains original structure and performances of silt features.If the water content at a lower level,the compaction power is lower than the structural damage and the compaction curve shows a dry density peak.With the increasing of water content,compaction power exceeds the structural damage and the compaction curve shows another dry density peak.Therefore,the compaction curves show instable bimodal phenomenon,which reduces the practicality and reliability of the compaction curves.However,the modified wet method is adopted to overcome the shortcomings of both wet method and dry method.The results provide an effective method for quality control of construction and quality evaluation of completion.