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Influence of water and mica content on resilient properties 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: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 9, no 3, 215-227 p.Article in journal (Refereed) Published
Abstract [en]

Elevated amounts of free mica particles in unbound granular materials used in road construction are believed to detrimentally influence bearing capacity. The objective of presented work was to investigate the influence of mica content on resilient properties of coarse granular material (maximum particle size 63mm) under varying water contents. The test scheme comprised triaxial tests, using constant confining pressures, at incrementally raised water contents up to practically full saturation. Increased mica content was achieved by replacing a part of the base material grading smaller than 4mm, with an equal amount of pure muscovite mica of similar grading, hence keeping the overall particle size distribution unchanged. Generally, resilient modulus decreased with increased mica content and elevated water contents caused reduction in stiffness. In relative terms, the reduction in resilient modulus caused by water decreased with increased mica content.

Place, publisher, year, edition, pages
2008. Vol. 9, no 3, 215-227 p.
Keyword [en]
Granular materials; Mica; Moisture; Time domain reflectometry; Triaxial test
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6963DOI: 10.1080/10298430701551193Scopus ID: 2-s2.0-46149100774OAI: oai:DiVA.org:kth-6963DiVA: diva2:11824
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

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