Experiment Study on Determination of Surface Area of Finegrained Soils by Mercury Intrusion Porosimetry

[摘要] The specific surface area (SSA) has a great influence on the physical and chemical properties of fine-grained soils. Determination of specific surface area is an important content for fine-grained soils micro-meso analysis and characteristic research. In this paper, mercury intrusion porosimetry (MIP) was adopted to determine the SSA of fine-grained soils including quartz, kaolinite, bentonite and natural Shenzhen soft clay. The test results show that the average values of SSA obtained by MIP are 0.78m2/g, 11.31m2/g, 57.28m2/g and 27.15m2/g respectively for very fine-grained quartz, kaolin, bentonite and natural Shenzhen soft clay, and that it is feasible to apply MIP to obtain the SSA of fine-grained soils through statistical analysis of 97 samples. Through discussion, it is necessary to consider the state of fine-grained soils such as pore ratio when the SSA of fine-grained soils is determined by MIP.

[发布机构] School of Engineering, Sun Yat-sen University, Guangzhou, GUANGDONG; 510275, China^1;Bureau of Public Works of Longgang Shenzhen Municipulity, Shenzhen, GUANGDONG; 518172, China^2;South China University of Technology, Guangzhou, GUANGDONG; 510641, China^3

[关键词] Average values;Experiment study;Fine grained;Fine grained soil;Mercury intrusion porosimetry;Physical and chemical properties;Specific surface area (SSA);Surface area