Special Issue "Clay Minerals in Geoengineering Applications: Behaviour, Hazards and Solutions"

A special issue of Minerals (ISSN 2075-163X).

Deadline for manuscript submissions: 30 November 2019

Special Issue Editor

Guest Editor
Dr. Abbas Taheri

School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide SA 5005, Australia
Website | E-Mail
Interests: drilling performance; rock burst investigation; behaviour of cement paste backfill material; slope and underground opening stability; advanced laboratory and field testing methods; soil improvement methods

Special Issue Information

Dear Colleagues,

Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces. They are important constituents of soil, and are among the most common and readily accessible of all of the materials encountered in construction operations. Most clay soils, particularly those containing active smectite minerals such as montmorillonite, are characterized as problematic, as their intrinsic mechanical features, for example, strength, bearing capacity and volume change, are often less than ideal for common geotechnical engineering applications. Clay soils are generally reactive to moisture variations, and their behaviour under loads consists of immediate and time-dependent deformations, that is, consolidation and creep, which present significant challenges for geotechnical engineering systems. Where exposed to seasonal environments, active clay minerals exhibit significant swell–shrink volume changes and desiccation-induced cracking, thereby bringing forth instability concerns to the overlying structures, and hence incurring large amounts of maintenance costs. Consequently, clay soils demand engineering solutions to alleviate the associated socio-economic impacts on human life. A leading solution to counteract such adversities is soil stabilisation, which includes any chemical, mechanical, biological, or combined practice of altering the soil fabric so as to meet the intended engineering criteria. This Special Issue aims to bring together corresponding original studies related to the identification, classification, characterisation, and stabilisation of clays and clay minerals for their effective use in geotechnical engineering projects. Fundamental constitutive modelling studies, analytical and numerical analyses, and experimental and field investigations will be considered.

Dr. Abbas Taheri
Guest Editor

Manuscript Submission Information

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Keywords

  • Clay
  • Expansive soil
  • Soil stabilisation
  • Soil characterisation
  • Experimental studies
  • Constituative and numerical modelling

Published Papers (1 paper)

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Research

Open AccessArticle
Swell–Shrink Behavior of Rubberized Expansive Clays during Alternate Wetting and Drying
Minerals 2019, 9(4), 224; https://doi.org/10.3390/min9040224
Received: 18 March 2019 / Revised: 31 March 2019 / Accepted: 6 April 2019 / Published: 9 April 2019
PDF Full-text (7674 KB) | HTML Full-text | XML Full-text
Abstract
The present study examines rubber’s capacity of improving the swell–shrink potential of expansive clays. Two rubber types of fine and coarse categories with different geometrical features were considered. The test program consisted of standard Proctor compaction and cyclic wetting–drying tests. Scanning electron microscopy [...] Read more.
The present study examines rubber’s capacity of improving the swell–shrink potential of expansive clays. Two rubber types of fine and coarse categories with different geometrical features were considered. The test program consisted of standard Proctor compaction and cyclic wetting–drying tests. Scanning electron microscopy (SEM) analysis was also performed to identify the soil–rubber amending mechanisms, and to observe the evolution of fabric in response to alternate wetting and drying. Cyclic wetting–drying led to the reconstruction of the soil/soil–rubber microstructure by way of inducing aggregation and cementation of the soil grains. The greater the number of applied cycles, the lower the swell–shrink features, following a monotonically decreasing trend, with the rubberized blends holding a notable advantage over the virgin soil. The tendency for reduction, however, was in favor of a larger rubber size, and more importantly the rubber’s elongated form factor; thus, predicating a rubber size/shape-dependent amending mechanism. The soil–rubber amending mechanisms were discussed in three aspects—increase in non-expansive content, frictional resistance generated as a result of soil–rubber contact, and mechanical interlocking of rubber particles and soil grains. The swell–shrink patterns/paths indicated an expansive accumulated deformation for the virgin soil, whereas the rubberized blends manifested a relatively neutral deformational state, thereby corroborating the rubber’s capacity to counteract the heave and/or settlement incurred by alternate wetting and drying. Full article
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