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Sealing Properties of Bentonite Suspensions

Published online by Cambridge University Press:  01 July 2024

M. B. Rollins
M. B. Rollins*
Affiliation:
U.S. Department of Agriculture, Reno, Nevada
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Abstract

Sealing with waterborne clays is a rapid and low cost method of controlling seepage through porous media whenever the clay source is within economical shipping distance of the sealing site. But more must be learned about this method of sealing before it can be fully utilized.

Water impedance of waterborne bentonites, as measured by water loss in the filter press test, was correlated with their physical, chemical and mineralogical properties. A multiple linear regression analysis showed clay content and exchangeable sodium percentage (ESP) were most highly correlated with water impedance. Swelling, viscosity and gelation of these clays play only a secondary role in forming a water barrier when used as dilute waterborne sealants as suggested by these and other data.

There were strong positive correlations between water loss and samples high in silt-sized cristobalite, quartz and feldspar; and negative correlations between water loss and samples high in clay-sized montmorillonite, chlorite and illite.

Predicted minimum clay contents (of prospective sealers) were found to be 65–75 per cent clay at 70 and 20 per cent exchangeable sodium, respectively.

Résumé

Résumé

L’obturation au moyen de suspensions d’argile dans de l’eau est un moyen rapide et économique de contrôler les infiltrations à travers les média poreux toutes les fois que la source d’argile se trouve à une distance d’expédition économique de l’emplacement où l’obturation est nécessaire. Pourtant il faut obtenir plus de renseignements concernant cette méthode d’obturation avant de pouvoir l’employer de manière optimum.

L’impédance à l’eau des suspensions aqueuses de bentonite, mesurée sur la base de la perte d’eau dans l’essai à la presse de filtrage a été corrélée avec leurs propriétés physiques, chimiques et minéralogiques. Une analyse multiple de régression linéaire a montré que la teneur en argile et le pourcentage de sodium échangeable (ESP) avaient la corrélation la plus importante avec l’impédance à l’eau. Le gonflement, la viscosité et la gelation de ces argiles jouent seulement un rôle secondaire dans la formation d’une barrière d’eau dans le cas d’emploi en taut qu’agents d’obturation en suspension aqueuse selon les données présentées ici et ailleurs.

Il y avait une corrélation positive et importante entre la perte d’eau et les échantillons à haute teneur en cristobalite vaseux, quartz et feldspar. Des corrélation négatives existaient entre la perte d’eau et les échantillons à teneur élevée en montmorillonite, chlorite et illite argileux.

La teneur minimum anticipée en argile pour les agents d’obturation était entre 65 et 75 pour cent d’argile avec 70 et 20 pour cent sodium échangeable.

Kurzreferat

Kurzreferat

Die Abdichtung mit Hilfe Ton-Suspensionen ist eine schnelle und billige Methode, um das Sickern durch poröse Media einzuschränken, vorausgesetzt, dass sich die Quelle der Tonminerale vom Standpunkt des Transportes wirtschaftlicher Entfernung von dem Ort der gewünschten Abdichtung befindet. Ehe diese Methode der Abdichtung zur vollen Anwendung kommt, muss sie jedoch zunächst noch in mancher Hinsicht erforscht werden.

Die Wasserimpedanz Wässeriger Bentonit-Suspensionen, gemessen an dem Wasserverlust im Filterpressversuch, wurde in eine Beziehung zu den physikalischen, chemischen und mineralogischen Eigenschaften der Bentoniten gebracht. Eine mehrfache lineare Regressionsanalyse zeigte, dass der Tongehalt und der Gehalt an austauschbarem Natrium (ESP) in engster Korrelation zur Wasserimpedanz standen. Wie diese und andere Daten zeigte, spielten bei Verwendung dieser Stoffe als verdünnte wässerige Abdichtungsmittel das Quellvermögen, die Zähigkeit und die Gelierung dieser Tone nur eine zweitrangige Rolle in der Bildung einer Wasserschranke.

Stark positive Korrelationen bestanden zwischen dem Wasserverlust und Proben mit hohem Gehalt an Cristobalit, Quarz und Feldspat in Schluffgrösse, während negative Korrelationen zwischen Wässerverlusten und Proben mit hohem Gehalt an Montmorillonit, Chlorit und Illit in Tongrösse festgestellt wurden.

Die minimalen Tongehalte (voraussichtlicher Abdichter) betrugen 65 bis 75 Prozent Ton bei einem entsprechenden austauschbaren Natriumgehalt von 70 bzw. 20 Prozent.

Резюме

Резюме

Изоляция при помощи переносимых водой глин—это быстрый и дешевый метод регулирования просачивания через пористые породы во всех тех случаях, когда источник глины находится на экономически оправдывающемся расстоянии от изолируемого участка. Однако, прежде чем можно будет полностью использовать этот метод изоляции, придется узнать больше о нем.

Водяной импеданс переносимых водой бентонитов, измеряемый потерей воды в филь- трпрессном испытании, был сопоставлен с их физическими, химическими и минералогическими свойствами. Анализ многократного линейного возвращения показал, что глиносодержание и процент обменного натрия были особо тесно связаны с импедансом воды. Набухание, вязкость и жеетинизация этих глин играют лишь второстепенную роль в образовании водяного барьера, пользуясь ими в качестве разбавленных переносимых водой укупоривающих средств, как это подсказывается этими и другими данными.

Имеются сильные положительные корреляции между потерей воды и образцами, содержащими крупное количество кристобалита, кварца и полевого шпата в размере пылеватой фракции; а отрицательные корреляции существуют между потерей воды и образцами, содержащими много монтмориллонита, хлорита и иллита в размере глинистых фракций.

Предсказываемое минимальное глиносодержание возможных уплотнителей составляет 65 до 75% глины при 70 и 20% обменного натрия соответственно.

Type
Research Article
Information
Clays and Clay Minerals , Volume 16 , Issue 6 , December 1969 , pp. 415 - 423
Copyright
Copyright © 1969, The Clay Minerals Society

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Footnotes

*

Contribution of the Southwest Branch of the Soil and Water Conservation Research Division, Agricultural Research Service, USDA, in cooperation with the Nevada Agricultural Experiment Station, Journal Series No. 79.

†

tThe use of this equipment does not imply approval of the product to the exclusion of others that may be suitable.

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