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Time domain reflectometry measurements and soil-water characteristic curves of coarse granular materials used in road pavements
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.ORCID iD: 0000-0002-7692-714X
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2007 (English)In: Canadian geotechnical journal (Print), ISSN 0008-3674, Vol. 44, no 7, 858-872 p.Article in journal (Refereed) Published
Abstract [en]

Coarse granular materials are used extensively in road construction. Bearing capacity can be affected by the water content in the layers of these materials. The ability to estimate water content and to infer water movements is therefore important. The purpose of the work described herein was to determine soil-water characteristic curves and the relationship between relative apparent permittivity and volumetric water content for coarse (maximum particle size 90 mm) granular materials having various gradations. The relative apparent permittivity was measured with the aid of time-domain reflectometry (TDR), and the concurrent matric suction was measured with a tensiometer. Samples were prepared in a steel box and were heavily compacted, and TDR probes and a tensiometer cup were buried within the matrix. The variation in volumetric water content with apparent relative permittivity was found to deviate from the Topp et al. relationship. Soil-water characteristic curves were described using the Brooks-Corey and van Genuchten models. A pronounced hysteresis between wetting and drying paths was observed. For the low water retention coarse materials, measurements of water content might, in general, require correction because of the nonlinear distribution of water in the sample.

Place, publisher, year, edition, pages
2007. Vol. 44, no 7, 858-872 p.
Keyword [en]
pavement; time-domain reflectometry; soil-water characteristic curve; granular material
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6962DOI: 10.1139/T07-024ISI: 000249708200008Scopus ID: 2-s2.0-35448953585OAI: oai:DiVA.org:kth-6962DiVA: diva2:11823
Note
QC 20100705. Uppdaterad från Accepted till Published i Diva 20100705.Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2012-03-20Bibliographically approved
In thesis
1. Influence of Water on Coarse Granular Road Material Properties
Open this publication in new window or tab >>Influence of Water on Coarse Granular Road Material Properties
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Even though the practical experience of using coarse unbound granular materials is extensive, detailed knowledge on the mechanical and hydraulic behavior is to a large extent lacking. Regarding influence of water on mechanical properties, this is even more pronounced. The main objective of this work was to investigate the influence of water on behavior and properties of coarse granular materials. The study comprises measurements of resilient properties, soil-water characteristic curve and influence of water content on dielectric properties measured by the use of time domain reflectometry (TDR).

The work described herein comprised two test series in terms of materials: firstly, a series where the grading was changed and secondly, a series where the influence of increased contents of free mica was studied. To measure resilient response, triaxial testing, using sample size of 500 mm diameter and 1000 mm height, was performed mainly using constant confining pressures. Tests were performed at incrementally varying water contents up to almost full saturation. Dielectric response and matric suction of compacted specimens were measured in a steel box at varying water content.

Results from the first series indicated that the influence of water content on resilient properties depends on the material grading. The coarsest grading, containing least fines, experienced only a small reduction when brought close to saturation. Specimens with an increased amount of fines and more even distribution responded with a substantial loss of resilient modulus upon increased water content. It also appeared as water content increased, the specimens became more dilative. From the second series, generally, resilient modulus decreased with increased mica content and furthermore, elevated water contents caused reduction in stiffness. However, in relative terms, the reduction in resilient modulus caused by water decreased with increased mica content. The soil-water characteristic curves are influenced by grading coefficient and mica content; retentive capacity increases with decreased grading coefficient and increases with increased amount of mica. Volumetric water content as a function of apparent relative permittivity was fitted using a third-degree polynomial. Although, determined relationships deviated from Topp's (1980) relationship.

Detailed information on the work is given in five enclosed papers.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 65 p.
Series
Trita-VT. FR, ISSN 1650-867X ; 07:02
Keyword
Highway Engineering, Granulat materials
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-4329 (URN)
Public defence
2007-04-25, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100705Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2012-03-20Bibliographically approved

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