›› 2014, Vol. 53 ›› Issue (5): 149-154.

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Characteristics of Special Surface Area and Cation Exchange Capacity of Lime-stabilized Loess

YAN Xude1, ZHANG Fanyu1,2, LIANG Shouyun1,2, WU Wanjiong1, ZHANG Jiaxuan1   

  1. 1.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000 China;
    2.Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou 730000,China
  • Received:2014-02-13 Online:2014-09-25 Published:2014-09-25

Abstract: In order to study the change rule of specific surface area (SSA) and cation exchange capacity (CEC) of different mixing ratio of lime-stabilized loess in the same curing time, the methylene blue spot method is used to test specific surface area and cation exchange capacity of the solidified loess in 7 days curing, calculating the activity and classification value of the stabilitied loess according to the specific surface area and clay content. The results show that specific surface area, ion exchange capacity, active index and classification value of the stabilized loess gradually reduce with the increment of quicklime mixing ratio, when the mixing ratio is 5% SSA and CEC show a turning point. The relation of specific surface area, cation exchange capacity and active index has been discussed. These results reveal that the formation of poly particle and increase of the macropore in the stabilized loess reduce the specific surface area and cation exchange capacity of natural loess. The advantages in pore size and the changes in porosity may be the reasons why SSA and CEC show a turning point with a mixing ratio of 5%.

Key words: stabilitied loess, specific surface area, cation exchange capacity, activity, classification value

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