Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Influence of mica content on time domain reflectometry and soil-water characteristic curve of coarse granular materials
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.
2008 (English)In: ASTM geotechnical testing journal, ISSN 0149-6115, E-ISSN 1945-7545, Vol. 31, no 4, 321-333 p.Article in journal (Refereed) Published
Abstract [en]

Elevated fractions of free mica particles in unbound granular materials, used in road constructions, are believed to reduce bearing capacity and influence the hydraulic behavior of the road structure. The objective of this investigation was to study the influence of mica content on the soil water characteristic curve and the dielectric response measured by time domain reflectometry, for coarse granular (maximum particle size 63 mm) materials. Increased fraction of mica was achieved by partly replacing the base crushed rock material smaller than 4 mm, by pure muscovite mica of similar grading, thereby keeping the overall particle size distribution unchanged. Acquired results indicated that, given equal matric suction, the water retention capacity increased with increased amount of mica. Concerning the time domain reflectometry measurements, no influence of mica content could be detected. Determined water contents required adjustment because of the nonlinear distribution of water in the sample.

Place, publisher, year, edition, pages
2008. Vol. 31, no 4, 321-333 p.
Keyword [en]
granular materials; mica; moisture; time domain reflectometry; soil water characteristic curve
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6964ISI: 000257724800005Scopus ID: 2-s2.0-54949136598OAI: oai:DiVA.org:kth-6964DiVA: diva2:11825
Note
QC 20100705. Uppdaterad från Submitted till Published i DiVA 20100705.Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2017-12-14Bibliographically 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

Open Access in DiVA

No full text

Scopus

Search in DiVA

By author/editor
Ekblad, JonasIsacsson, Ulf
By organisation
Civil and Architectural Engineering
In the same journal
ASTM geotechnical testing journal
Civil Engineering

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 83 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf