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Showing 1 to 20 of 22 for “"pavement layers"”.
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Evaluation of bond between pavement layers: fracture mechanics approach
Bonding between adjacent pavement layers is one of the most important factors affecting pavement service life. Poor bonding between adjacent layers of hot mix asphalt can lead to different types of distresses in pavement system such as slippage cracking, top-down cracking, premature fatigue …
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An improved backcalculation method to predict flexible pavement layers moduli and bonding condition between wearing course and base course.
… procedure, for the determination of flexible pavement properties from the Falling Weight Deflectometer (FWD) test results. The conventional backcalculation methods estimate the pavement layer moduli assuming full adhesion exists between layers in the analysis process. The method developed in …
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The use of Sardinian granite by-products from the Sarrabus Gerrei region to be used in road pavement layers
… to other aggregates that normally are used in pavement layers could decrease road construction costs. In this research granite by-products from the Sarrabus-Gerrei region were studied to evaluate the physical and mechanical properties to assess the possibility of using them to their fullest …
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Ein Beitrag zur experimentell gestützten Tragsicherheitsbewertung von Massivbrücken
… of concrete structures. By now, the influence of pavement or floor layers and of other factors on the load carrying capacity is not known exactly. In this thesis, it has been investigated how road pavements, the geometry and bridge caps reduce the actions on concrete bridge structures and how …
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Investigation of the performance of flexible pavement systems under moving loads using finite element analyses
… current design methods inadequate for airfield pavements. In addition, airport pavements experience significant wander. However, the effect of wander on airport pavement performance has not been evaluated. In previous studies, the stress interactions between each tire of a triple-dual-tandem …
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Verification of asphalt concrete performance prediction using level 2 and level 3 inputs of mechanistic-empirical pavement design guide for flexible pavements of the state of New Jersey
… verification study of the Mechanistic-Empirical Pavement Design Guide (M-EPDG) using level 2 and level 3 inputs. In addition, the challenges of verification of the predicted performance with the help of field-measured data of existing flexible pavements are also presented. In this study, …
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Optimization of in-situ tack coat application rate and installation
Interface bonding between pavement layers is a key factor affecting the performance of any pavement structure. Over the years, several studies have been performed to better understand bonding between pavement layers. The first phase of this study was a laboratory assessment, which analyzed …
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Implementation of mechanistic-empirical approach for structural design of hydrated lime modified flexible pavement
… and rehabilitation of highway and airport pavements has been recognized for many years. Mechanistic methods are based on the principles of mechanics in contrast to the particular purpose and empirical procedures that are often used.The objective of this study is the development of …
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Combining seismic and geotechnical methods to improve the prediction of physical soil properties
… assessing the properties of the thin targeting layers of soil as pavement layers. Therefore, this research aim was to evaluate the limitations and reliability of BE procedure in the laboratory and the field. The research had two main stages; laboratory and model stages. In the laboratory stage, …
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Moisture effects on the mechanical behavior of flexible pavement subgrades
<p>All pavement materials contain moisture in various forms and amounts. The effects of moisture on the mechanical behavior of these materials vary from small for some bound materials to very significant for some fine grained soils. Moisture effects become critical particularly during the spring …
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Three-Dimensional Finite Element Analysis of Flexible Pavements Considering Nonlinear Pavement Foundation Behavior
… mechanistic-empirical concepts in the design of pavement structures, state-of-the-art mechanistic analysis methodologies are needed to determine accurate pavement responses, such as stress, strain, and deformation. This research has focused on the nonlinear modulus and deformation behavior of …
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Analytical solutions for temperature profile prediction in multi-layered pavement systems
Accurate prediction of pavement temperature profile is essential to better characterize the mechanistic properties of paving materials and predict pavement responses under traffic and environmental loadings. In practice, characterizing the field temperature profiles are desired in order to …
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Assessing the Mechanical Response of Pavements During and After Flooding
… and a threat to the load carrying capacity of pavements around the world. In the aftermath of flooding, the pavement structure could be inundated and fully saturated. The significant increase of water within pavement layers may cause weakness and induce damage with traffic loading, subsequently …
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Fracture-Based Method to Determine the Flexural Load Capacity of Concrete Slabs
… limited availability of raw materials for rigid pavements pose a unique challenge in terms of the initial pavement design, concrete material selection, and the slab's cracking performance throughout its service life. New pavement technologies and concrete materials continue to be developed to …
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Mechanistic characterization of thin asphalt overlays for pavement preservation
… a preservation treatment for rigid and flexible pavements to improve ride quality, extend service life, and reduce noise levels on pavements. However, compared to the conventional methods of mechanistic analysis, analyzing thin AC overlay is complicated as these layers are directly exposed to …
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The impact of unwashed aggregate on water quality emanating from permeable pavements
… through a multi-objective approach. Permeable pavement systems (PPSs) are one of the most widely-adopted SuDS technologies in South Africa. South Africa is a water scarce country and the sustainable provision of water to its citizens is one of the most significant challenges facing the country. …
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Stabilisation of clay subgrade soils using ground granulated blastfurnace slag
… heaving, cracking and the break up of the road pavement. Stabilisation of these types of soil is necessary to suppress swelling and increase the strength of the soil and thus partially decrease the thickness of road pavement layers. The use of by-product materials for stabilisation has …
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Prediction of in-situ asphalt mixture density using ground penetrating radar: theoretical development and field verification
… important to the performance of flexible pavements: density that is too high, or too low, may cause early pavement distresses. Traditionally, two methods have been commonly used for in-situ asphalt mixture density measurement: laboratory testing on field-extracted cores, and in-situ …
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Improving the performance of cold bituminous emulsion mixtures (CBEMs) : incorporating waste
… to conventional hot asphalts, for all bound pavement layers are: the high compacted mixture porosity, low early life strength and long curing times. CBEMs are more widely accepted in low to medium trafficked pavements. The key aims of this investigation were to improve and simplify the design …
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On Cross-Anisotropy of Flexible Pavement Layer Materials for Improved Pavement Responses
<p>Pavement layer materials are typically assumed to be isotropic in determining pavement responses, such as stress and strain. The main benefit of the isotropic assumption is that stiffness defined by modulus of elasticity (E-value) is equal in all directions. In reality, stiffness along vertical …
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