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Statistical evaluation of resilient models for characterizing coarse granular materials
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2008 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 41, no 3, 509-525 p.Article in journal (Refereed) Published
Abstract [en]

Consistent material modeling is a prerequisite for a mechanistic approach to pavement design. The scope of this investigation was to statistically evaluate the efficiency of various resilient models commonly encountered in highway engineering. These models were categorized as describing either resilient modulus or shear and volumetric strains. Triaxial tests using constant and cyclic confining pressure were performed on coarse granular materials of various gradings (maximum particle size 90 mm). Two statistical methods, the extra sum of squares F-test and the Akaike information criterion, were used for model comparison. Concerning resilient modulus, the Uzan model provided, in general, a statistically significant improvement compared to the k-theta model. However, this improvement is lost if a constant Poisson ratio is used to predict shear and volumetric strains. In case of the shear-volumetric approach, no single model was most likely to be the best model for all gradings studied.

Place, publisher, year, edition, pages
2008. Vol. 41, no 3, 509-525 p.
Keyword [en]
unbound granular materials; resilient modulus; shear-volumetric models; Akaike information criterion; highway engineering
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-6965DOI: 10.1617/s11527-007-9262-9ISI: 000254112600006ScopusID: 2-s2.0-41049112479OAI: diva2:11826
QC 20100705. Uppdaterad från Submitted 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.
Trita-VT. FR, ISSN 1650-867X ; 07:02
Highway Engineering, Granulat materials
National Category
Civil Engineering
urn:nbn:se:kth:diva-4329 (URN)
Public defence
2007-04-25, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00
QC 20100705Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2012-03-20Bibliographically approved

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