In-Place Stiffness and Modulus Measurements

Fiedler, Scott A.; Main, Melvin; Dimillio, Albert F

doi:10.1061/40486(300)24

Cited by 7 publications

(5 citation statements)

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“…The small-strain modulus of soils is routinely measured in earthquake engineering. In pavement engineering, the application of small-strain modulus tests to assess the modulus of pavement materials and structural variability for pavement performance has increased dramatically (Kim and Stokoe 1992;Souto et al 1994;Kim et al 1997;Chen et al 1999;Nazarian et al 1999;Fiedler et al 2000;Yesiller et al 2000;Zeng et al 2002;Nazarian et al 2003;Sawangsuriya et al 2005;Edil and Sawangsuriya 2005). The main advantage of small-strain modulus tests is the ability to noninvasively and nondestructively assess the modulus of pavement materials at the surface or under a free-field condition (i.e., near-zero confining pressure).…”

Section: Introductionmentioning

confidence: 97%

Modulus−suction−moisture relationship for compacted soils

2008

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The ultimate parameter of interest in engineering design of compacted subgrades and support fills for highways, railroads, airfields, parking lots, and mat foundations is often the soil modulus. Modulus of compacted soils depends not only on dry unit weight and moisture but also on matric suction and soil structure (or fabric) resulting from the compaction process. However, these relationships in the as-compacted state (i.e., immediately after compaction) have not yet been extensively explored. This paper presents an experimental laboratory study of the shear modulus -matric suction -moisture content-dry unit weight relationship using three compacted subgrade soils. Compacted subgrade specimens were prepared over a range of molding water contents from dry to wet of optimum using enhanced, standard, and reduced Proctor efforts. A nondestructive elastic wave propagation technique, known as bender elements, was used to assess the shear wave velocity and corresponding small-strain shear modulus (Go) of the compacted subgrade specimens. The matric suctions were measured with the filter paper method. An empirical relation that takes into account the effect of compaction conditions is proposed for the Go -matric suction -molding water content relationship of compacted subgrade soils.Résumé : Le paramètre ultime d'ingéniérie qui est d'intérêt dans le calcul d'ingénieur des infrastructures compactées et des remblais de soutien pour les autoroutes, les voies ferrées, les aéroports, les aires de stationnement, et les nattes de fondations est souvent le module du sol. Le module des sols compactés dépendent non seulement du poids volumique sec et de la teneur en eau mais aussi de la succion matricielle et de la structure du sol (ou fabrique) résultant du processus de compactage. Cependant, ces relations dans l'état tel que compacté (c.-à-d. immédiatement après compactage) n'ont pas encore été abondamment explorées. Cet article présente un étude expérimentale en laboratoire de la relation module de cisaillement -succion matricielle -teneur en eau -poids volumique sec en utilisant ces sols d'infrastructure compactés. Des échantillons d'infrastructure compactés ont été préparés dans une large plage de teneurs en eau de moulage en partant du côté sec au côté mouillé de l'optimum et en utilisant des efforts Proctor augmentés, standard, et réduits. Une technique de propagation d'ondes élastiques non destructives au moyen de languettes piézocéramiques a été utilisée pour évaluer la vitesse de l'onde de cisaillement et le module correspondant de cisaillement à faible déformation (Go) des spécimens d'infrastructure compactés. Les succions matricielles ont été mesurées avec la méthode du papier filtre. On propose une relation empirique qui prend en compte l'effet des conditions de compactage pour la relation Go -matrice de succionteneur en eau de moulage des sols d'infrastructure compactés.

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Section: Introductionmentioning

confidence: 97%

Modulus−suction−moisture relationship for compacted soils

2008

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“…Generally, Go of geomaterials is routinely measured in earthquake engineering. In highway engineering, the application of Go tests to assess the stiffness of highway materials and structural variability for pavement performance has increased dramatically (Kim and Stokoe 1992, Souto et al 1994, Kim et al 1997, Chen et al 1999, Nazarian et al 1999, Fiedler et al 2000, Yesiller et al 2000, Zeng et al 2002, Nazarian et al 2003. The key advantage of Go tests over conventional modulus tests is their ability to rapidly and non-destructively assess the shear modulus of highway materials at the surface or under a free-field condition (i.e., zero confining pressure).…”

Section: Application Of Wave Propagation Methods In Pavement Design Amentioning

confidence: 99%

“…The near-surface stiffness of geomaterials is then determined as the ratio of the applied force to the measured deflection. Wu et al (1998), Humboldt (1999, 2000a, 2000b, Fiedler et al (1998Fiedler et al ( , 2000, Nelson and Sondag (1999), Chen et al (1999), Siekmeir et al (1999), Hill et al (1999), Sargand et al (2000), Weaver et al (2001), Lenke et al (2001Lenke et al ( , 2003, Sargand (2001), Peterson et al (2002), Sawangsuriya et al (2002Sawangsuriya et al ( , 2003Sawangsuriya et al ( , 2004) Bender Element…”

Section: Test Principle Referencesmentioning

confidence: 99%

Wave Propagation Methods for Determining Stiffness of Geomaterials

Sawangsuriya¹

2012

Wave Processes in Classical and New Solids

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“…Current in situ quality evaluation testing techniques include stiffness test methods [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Stiffness spot test methods are less frequently employed, as the number of test points is limited, certain test methods are time-consuming, and they cause interference with the construction operations.…”

Section: Introductionmentioning

confidence: 99%

A Resistivity Plate Loading Device for Assessing the Factors Affecting the Stiffness of a Cement-Stabilized Subgrade

2022

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The extent of mixing in the stabilization process and the control of the cement content (C) and water content (w) in the mixture are key to the outcome of the engineering performance of a cement-stabilized subgrade. Intelligent Compaction (IC) quality control has improved quality control and management practices during construction. Intelligent Compaction Measurement Values (ICMVs) selected to evaluate the stiffness properties of cement-stabilized soils do not directly relate to the stiffness properties of the cement-stabilized subgrade and do not consider w and C. Additional tests need to be conducted for calibration of ICMVs. In this study, our solution is the development of a resistivity plate loading test. The resistivity plate loading test features the flexibility in determining the soil stiffness, w, C, and other important factors, such as the time of test effect (hydration) (T) and dry density (ρd). To verify the accuracy of the testing method, laboratory experimental studies were conducted on cemented soils considering ρd, w, C, and T at different factor levels. Multiple response studies based on grey rational analysis (GRA) were conducted. Analysis of the input factors was performed, and their effects on the measured responses were quantified. According to the study, the ρ measured by the device was a powerful indicator of stiffness, ρd, w, C, and T, which showed that the device can be useful equipment for quality control and an advancement in the in situ testing technologies and test equipment. A statistical regression model based on the linear and linear plus interaction terms among the factors is proposed to predict the average responses.

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In-Place Stiffness and Modulus Measurements

Cited by 7 publications

References 0 publications

Modulus−suction−moisture relationship for compacted soils

Modulus−suction−moisture relationship for compacted soils

Wave Propagation Methods for Determining Stiffness of Geomaterials

A Resistivity Plate Loading Device for Assessing the Factors Affecting the Stiffness of a Cement-Stabilized Subgrade

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