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10 November 2016 Calibration of Whatman Grade 42 filter paper for soil suction measurement
Hobi Kim, Monica Prezzi, Rodrigo Salgado
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The filter paper technique consists of obtaining the equilibrium water content of a filter paper that is either in direct contact with a soil sample or inside an airtight container together with the sample but not in direct contact with it. After the final water content of the filter paper is determined, the suction in the soil is estimated from a previously established calibration curve relating the filter paper water content and suction. The ASTM D5298-10 calibration curve is routinely used for indirect suction estimation from Whatman Grade 42 filter paper water content measurements. This note identifies limitations in the calibration curve in ASTM D5298-10 that lead to inaccuracies in the estimation of suction values, particularly for very low filter paper water contents. The paper proposes new equations not subject to these limitations for the calibration curve for Whatman Grade 42 filter paper using the same data used to construct the calibration curve in ASTM D5298-10.

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Hobi Kim, Monica Prezzi, and Rodrigo Salgado "Calibration of Whatman Grade 42 filter paper for soil suction measurement," Canadian Journal of Soil Science 97(2), 93-98, (10 November 2016).
Received: 11 June 2016; Accepted: 1 October 2016; Published: 10 November 2016

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filter paper technique
mesure de la succion
papier filtre Whatman n° 42
sol insaturé
suction measurement
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