Journal Published Online: 29 May 2020
Volume 43, Issue 6

Examining the Contact Filter Paper Method in the Low Suction Range

CODEN: GTJODJ

Abstract

The filter paper method for measuring suction is standardized in ASTM D5298-16, Standard Test Method for the Measurement of Soil Potential (Suction) Using Filter Paper. The contact filter paper is usually calibrated using a pressure plate apparatus from 10 to 1,500 kPa. The filter paper calibration curve is commonly plotted on a log-log or semilog graph with water content as the abscissa and suction as the ordinate. To evaluate the accuracy of the filter paper calibration curve in the low suction range (<10 kPa), the Whatman No. 42 filter paper is assessed using the capillary-rise method for suction range from 0.1 to 1.6 kPa and using the Tempe cell for suction range from 3 to 7 kPa. The test results from the capillary-rise method and Tempe cell tests show different trends. The difference in trends is attributed to the limitation of the axis-translation technique used in the Tempe cell test, which is not applicable at a high degree of saturation. The capillary-rise method shows that the Whatman No. 42 filter paper has a maximum water content of about 135 % and minimum measurable suction of about 1 kPa. The water content of the filter paper at 1 kPa suction can be used to supplement the other method for suctions greater than 10 kPa to give the calibration curve of the Whatman No. 42 filter paper.

Author Information

Leong, E. C.
School of Civil & Environmental Engineering, Nanyang Technological University, Singapore
Wijaya, M.
School of Civil & Environmental Engineering, Nanyang Technological University, Singapore
Tong, W. Y.
School of Civil & Environmental Engineering, Nanyang Technological University, Singapore
Lu, Y.
School of Civil Engineering, Guangzhou University, Guangzhou, China
Pages: 7
Price: $25.00
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Stock #: GTJ20190237
ISSN: 0149-6115
DOI: 10.1520/GTJ20190237