›› 2012, Vol. 33 ›› Issue (1): 73-77.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Superficial adsorption experiment and water adsorption corroboration for lime modified expansive soils

YU Jin1, 2，WANG Hai3，ZHENG Chun-ting1，CAI Yan-yan1，SONG Lei4   

  1. 1. Institute of Geotechnical Engineering, Huaqiao University, Xiamen, Fujian 361021, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; 3. CCCC First Highway Consultants Co., Ltd., Xi’an 710075, China; 4. College of Chemical Engineering, Huaqiao University, Xiamen, Fujian 361021, China
  • Received:2011-06-30 Online:2012-01-10 Published:2012-01-17

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Abstract: For the lime modified expansive soil, two series of tests are carried out. The first ones are water vapor adsorption tests, which are carried out using water vapor adsorption apparatus. The results indicate that with the increasing of lime percentage, the hydroscopicity of expansive soil decreased first then started to increase. And the minimum hydroscopicity is obtained at the point when the content of lime is 6%. In order to study the main reason causing the change of hydroscopicity, the second tests, i.e. the nitrogen adsorption tests, are performed on modified expansive soil. Analysis of the change of porous structure is made. It is found that with the increase of lime percentage, BET microporous specific surface area changes as the fold line; and the minimum value is obtained when the content of lime is 6%. With the increase of lime percentage, accumulating mesoporous volume decreased. With the increase of lime percentage, mesoporous diameter increases first, then decreases, and the maximum value is obtained when the content of lime is 6%. That the hydroscopicity of expansive soils is inversely proportional to the mesoporous diameter is summarized; and the optimal lime percentage is 6%.

Key words: water vapor adsorption test, nitrogen adsorption test, expansive soils, hydroscopicity

CLC Number: 

  • TU 443
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