Impact of clay on early jet grouting strength

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Title: Impact of clay on early jet grouting strength
Authors: Laefer, Debra F.
O'Neill, Daire
O'Mahony, Cian
Permanent link: http://hdl.handle.net/10197/2420
Date: Oct-2009
Abstract: Jet grouting is a ground improvement technique that has become widely adopted over the past three decades, yet relatively little data has been published about performance characteristics of mixes under adverse conditions, such as the inclusion of clay lenses. This paper presents an experimental investigation on the impact of clay on the strength of jet grouting. A total of 150 grout samples were subjected to 0-10% levels of Kaolinite and Bentonite inclusion. While the Bentonite was introduced as a pre-hydrated slurry, the Kaolinite was mixed in two ways: in a pulverized condition and as large chunks. Sample strength and stiffness were measured at multiple dates within the first 28 days. With 10% clay inclusion all samples exhibited significant strength and stiffness losses. With some, substantial losses began with as little as 4% clay inclusion. Even a 1% clay inclusion tended to decrease strength and stiffness between one-quarter and onethird of the control sample. Depending upon clay type and inclusion method, results differed significantly with respect to strength and stiffness development and failure mechanism. Petrographic analysis was used to provide further insights as to apparently divergent behaviors.
Funding Details: Not applicable
Type of material: Conference Publication
Publisher: DFI
Copyright (published version): 2009 DFI
Keywords: Jet groutingGround improvementClayStrength
Subject LCSH: Grouting--Testing
Clay
Soil stabilization
Language: en
Status of Item: Peer reviewed
Is part of: DFI Proceedings of the 34th Annual Conference on Deep Foundations, 2009
Conference Details: DFI 34th Annual Conference on Deep Foundations, October 20-23 2009, Kansas City
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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