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Showing 1 to 20 of 37 for “"resilient modulus"”.
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Resilient modulus estimation system
… a software tool developed for estimating resilient modulus of subgrade material, predicting field moisture content for different combinations of environmental and pavement related factors, and modifying resilient modulus values based on changes in moisture contents. Subgrade resilient …
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Evaluation of the laboratory resilient modulus test using a New Mexico subgrade soil
Resilient modulus (Mr) is a laboratory determined parameter, where a cylindrical specimen is subjected to dynamic axial stresses under confining stresses, while axial deformations are measured. By definition Mr is the ratio of the peak axial stress to the corresponding recoverable axial strain. …
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Development of Laboratory to Field Shift Factors for Hot-Mix Asphalt Resilient Modulus
Resilient moduli of different surface mixes placed at the Virginia Smart Road were determined. Testing was performed on Field cores (F/F) and laboratory-compacted plant mixed (F/L), laboratory mixed and compacted per field design (L/L), and laboratory designed, mixed, and compacted (D/L) specimens. …
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Laboratory specimen preparation for cold recycled asphalt
… the rejuvenating action to produce a higher resilient modulus in the shortest time was investigated. Specimens were cured at different temperatures and tested for resilient modulus. Core specimens were to be taken from cold recycled asphalt pavements for comparison, but this did not eventuate …
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Evaluation of Moisture, Suction Effects and Durability Performance of Lime Stabilized Clayey Subgrade Soils
Resilient modulus (MR) of soils is well-accepted and essential parameter for structural design of flexible pavements using the Mechanistic Empirical Pavement Design Guide (MEPDG). A comprehensive laboratory study is undertaken to evaluate the moisture, suction effects and durability performance on …
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Ensaios triaxiais dinâmicos de um solo arenoso
… of Rio Grande do Sul, in order to determine its resilient modulus. The procedures for setting up the testing equipment, calibrating and using it, are described. A compressed air system for applying axial loads and confining pressure, LVDT's transducers, and an oscillograph were used. Soil …
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Ensaios triaxiais dinâmicos de solos argilosos
… stresses and compaction conditions on the resilient modulus, and to verify the effects of stress magnitude, compaction moisture, and delay between compaction and testing (thixotropy), on the correlation between deformations - recoverable and permanent - and the number of load applications. …
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… Soil stiffness can be characterized by the resilient modulus. Experimental tests were performed for saturated and unsaturated soil specimens. Both saturated and unsaturated samples showed pore water pressure buildup and residual pore water pressure. As a result, the effective stress in …
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Engineering Performance of Polymer Amended Soils
… wet-dry durability tests; and stiffness through resilient modulus tests and through interpretation of the unconfined compression and direct shear test results.</p> <p>The addition of polymer altered the optimum moisture content of the soils. Change in optimum moisture content ranged from 0.51 to …
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Characterization of Emulsion Aggregate Mixtures
… Shear strength, repeated loading response (resilient modulus, permanent deformation), tensile strength, Dynamic Cone Penetrometer (DCP) and curing effects are evaluated in the laboratory. In-service EAM pavement evaluation includes distresses, DCP, and non-destructive testing using the …
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Pedologic Based Subgrade Characterization for Low-Volume Pavement Design
… Conservation Service, to estimate the subgrade resilient modulus for structural pavement design. Such a procedure allows highway agencies to evaluate subgrade soils in the absence of comprehensive subgrade characterization programs.
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Performance of advera® warm mix asphalt with reclaimed asphalt pavement materials
… 30 and 40% RAP of total mass were evaluated for resilient modulus, rutting and moisture susceptibility. The results show that Advera®. modified binder significantly reduced mixing and compaction temperatures. Modified binder with 5% Advera® show significant increase in rutting resistance for both …
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The effects of micro and nano size bauxite particles in modified asphalt binders and asphaltic mixtures
… prepared with MBP and NBP were evaluated for resilient modulus, dynamic creep and rutting susceptibility. In this study, the size of MBP and NBP used were less than 75 μm and in ranges of 10 nm to 20 nm, respectively. The result shows that the addition of 7% MBP and NBP in asphalt binder have …
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Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior
… This research has focused on the nonlinear modulus and deformation behavior of pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, due to repeated wheel loading. This nonlinear behavior is commonly characterized by …
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Developing a Design Procedure for Pavement Millings for New and Rehabilitated Unpaved Gravel Roads
… were identified in the Douglas County area. Resilient modulus (MR) for the subgrade sources were obtained based on AASHTO T-307. The milling surfaced roads are made of 100% RAP millings without any binder or recycling agent. It is a specialized case to investigate the behavior of RAP material …
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Investigation of cracking resistance of recycled Superpave mixtures
… energy ratio, and flexibility index but high resilient modulus. These results indicate that mixtures containing 10% RAP and 5% RAS are stiffer, more prone to cracking, and tend to absorb less fracture energy. Mixtures with 25% RAP and no RAS showed the opposite behavior.
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Assessment of Improvement in Unpaved Roadway Performance Using 3D Geogrids Under Cyclic Loading
… improvement was assessed by examining the Resilient Modulus (MR), plastic strain (p) and elastic strain (e) and comparing durability and rutting between reinforced and unreinforced sections. The results showed that reinforced samples experienced up to a 20% increase in resilient modulus …
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Laboratory evaluation of asphalt-portland cement concrete composite
… tensile strength, compressive strength, and resilient modulus, while the evaluated durability properties include water sensitivity, freeze-thaw and chloride intrusion resistance. Specimens were also tested for different moist curing levels to evaluate the optimum moist curing period. Three …
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An improved backcalculation method to predict flexible pavement layers moduli and bonding condition between wearing course and base course.
… other well known programs such as WESDEF and MODULUS. Full scale pavement testing using the FWD has been performed and the backcalculated results compared with measured values for the pavement materials. Indirect tensile tests for resilient modulus of bituminous materials were carried out on …
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Asphalt Perpetual Pavement Design: Utilizing Existing Pavement Systems in Ohio
… in addition, Indirect Tensile Strength (IDT) and Resilient Modulus (E) tests were performed in the laboratory. In 2012, five of those sites were selected to perform and verify the test results. The results were similar which validated the data from 2010. FWD back-calculation was used as the basis …
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