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Author: Hasan Kazmee
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 82
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Book Description
With recent focus on sustainable construction practices and the ever-increasing transportation costs and scarcity of natural resources, integration of large-size and marginally acceptable aggregates and recycled materials (e.g., reclaimed asphalt pavement [RAP]) with current construction specifications is becoming imperative. As an incentive, the Illinois Department of Transportation has been using large-size rocks, popularly known as aggregate subgrade. However, adequate scientific knowledge about material performance is largely unknown. To this end, a research study was undertaken at the Illinois Center for Transportation to evaluate the adequacy and field performances of IDOT's new aggregate subgrade specifications. A state-of-the-art image analysis technique was used to characterize the size and shape as well as the texture and angularity properties of selected aggregate subgrade materials. For field evaluation, 24 combinations of pavements were constructed over subgrade with controlled low immediate bearing value (IBV) or unsoaked California bearing ratio (CBR) strength properties. Construction quality control was achieved through inplace density and modulus measurements on aggregate layers using a nuclear gauge, lightweight deflectometer, and soil stiffness gauges. Periodic rut measurements were carried out on the pavement surface throughout the accelerated loading process using an Accelerated Transportation Loading Assembly (ATLAS). Contributions of the underlying pavement layers to the total rut accumulation were evaluated through innovative applications of groundpenetrating radar (GPR), a lightweight variable-energy penetrometer device, known as the PANDA, and a geoendoscopy probe. Layer intermixing and material migration at the aggregate subgrade-subgrade interface improved the foundation layer stiffness properties and pavement performance results significantly. RAPcapped construction platforms consistently exhibited a higher magnitude of rutting. Performances of flexible pavement sections were governed by the as-constructed HMA thicknesses, which varied considerably during the paver operation because of RAP subbase sinkage and the weak subgrade. Adequate validation and potential revisions to current IDOT specifications were recommended.
Author: Hasan Kazmee
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 82
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Book Description
With recent focus on sustainable construction practices and the ever-increasing transportation costs and scarcity of natural resources, integration of large-size and marginally acceptable aggregates and recycled materials (e.g., reclaimed asphalt pavement [RAP]) with current construction specifications is becoming imperative. As an incentive, the Illinois Department of Transportation has been using large-size rocks, popularly known as aggregate subgrade. However, adequate scientific knowledge about material performance is largely unknown. To this end, a research study was undertaken at the Illinois Center for Transportation to evaluate the adequacy and field performances of IDOT's new aggregate subgrade specifications. A state-of-the-art image analysis technique was used to characterize the size and shape as well as the texture and angularity properties of selected aggregate subgrade materials. For field evaluation, 24 combinations of pavements were constructed over subgrade with controlled low immediate bearing value (IBV) or unsoaked California bearing ratio (CBR) strength properties. Construction quality control was achieved through inplace density and modulus measurements on aggregate layers using a nuclear gauge, lightweight deflectometer, and soil stiffness gauges. Periodic rut measurements were carried out on the pavement surface throughout the accelerated loading process using an Accelerated Transportation Loading Assembly (ATLAS). Contributions of the underlying pavement layers to the total rut accumulation were evaluated through innovative applications of groundpenetrating radar (GPR), a lightweight variable-energy penetrometer device, known as the PANDA, and a geoendoscopy probe. Layer intermixing and material migration at the aggregate subgrade-subgrade interface improved the foundation layer stiffness properties and pavement performance results significantly. RAPcapped construction platforms consistently exhibited a higher magnitude of rutting. Performances of flexible pavement sections were governed by the as-constructed HMA thicknesses, which varied considerably during the paver operation because of RAP subbase sinkage and the weak subgrade. Adequate validation and potential revisions to current IDOT specifications were recommended.
Author: Andreas Loizos
Publisher: CRC Press
ISBN: 1351585797
Category : Technology & Engineering
Languages : en
Pages : 364
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Book Description
Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Author: Masoumeh Tavakol
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Recycled concrete aggregate (RCA) is the byproduct of the demolition of concrete structures and pavements. An estimated 140 million tons of concrete waste is produced annually in the United States, most of which ends up in landfills. The use of RCA to replace quarried aggregates in paving projects is one way to utilize these materials and alleviate concerns regarding this increasing waste stream. RCA usage prevents waste concrete disposal into landfills, resulting in more sustainable use of mineral aggregate sources, and may further reduce costs associated with paving projects. However, the inferior physical properties of RCA, such as the presence of recycled mortar, complicate the incorporation of RCA into new concrete mixtures. State highway agencies such as the Kansas Department of Transportation are facing further issues with RCA from D-cracked pavements, raising the question if D-cracked aggregates should be used in paving operations. No known work has evaluated the effect of RCA from D-cracked pavements in subgrade soil stabilization. This study stabilized a low-plasticity clay in Kansas using RCA and three stabilizing materials (lime, Class C fly ash, and a combination of Portland cement and fly ash). Candidate mixtures with varying proportions of chemical stabilizers and D-cracked aggregates were evaluated using the standard Proctor, unconfined compressive strength, linear shrinkage, and California Bearing Ratio tests. Microstructure characteristics of selected mixtures were explored using scanning electron microscopy (SEM) and energy dispersive X-ray tests. Laboratory test results indicated that RCA, in conjunction with all cementitious materials except lime, improved clay strength, stiffness, and shrinkage properties. SEM results indicated that RCA caused a low void space and a dense arrangement of soil particles. RCA effectively improved evaluated mixture properties when an adequate soil-RCA bond was reached using chemical agents. The long-term performance of full-depth flexible pavements with stabilized mixtures as subgrade was assessed in the AASHTOWare Pavement ME Design (commonly known as MEPDG) software. The life-cycle cost of flexible pavements with stabilized mixtures was estimated for a 40-year design period. Economic analysis results indicated that RCA was cost effective only if it was used with a combination of fly ash and Portland cement.
Author: A. Gomes Correia
Publisher:
ISBN:
Category :
Languages : en
Pages : 231
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Book Description
Author: Rafael F. Pezo
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 550
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Book Description
Author:
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 148
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Book Description
This research project covered a wide range of activities that allowed researchers to understand the relationship between stability, pavement distress, and recycled portland cement concrete (RPCC) subbase aggregate materials. Detailed laboratory and field tests, including pavement distress surveys, were conducted at 26 sites in Iowa. Findings show that specific gravities of RPCC are lower than those of crushed limestone. RPCC aggregate material varies from poorly or well-graded sand to gravel. A modified Micro-Deval test procedure showed that abrasion losses of virgin aggregate materials were within the maximum Micro-Deval abrasion loss of 30% recommended by ASTM D6028-06. Micro-Deval abrasion loss of RPCC aggregate materials, however were much higher than those of virgin materials and exceeded 30% loss. Modulus of elasticity of RPCC subbase materials is high but variable. RPCC subbase layers normally have low permeability. The pavement surfaces for both virgin and RPCC subbase across Iowa were evaluated to fulfill the objectives of this study related to field evaluation. Visual distress surveys were conducted to gather the detailed current pavement condition information including the type, extent, and severity of the pavement distresses. The historical pavement condition information for the surveyed field sections was extracted from the Iowa DOT's Pavement Management Information System (PMIS). The current surface condition of existing field pavements with RPCC subbase was compared with the virgin aggregate subbase sections using two different approaches. The changes in pavement condition indices (PCI and IRI) with time for both types of pavements (subbases) were compared.
Author: Erol Tutumluer
Publisher: Springer Nature
ISBN: 3030772306
Category : Science
Languages : en
Pages : 971
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Book Description
This volume presents selected papers presented during the 4th International Conference on Transportation Geotechnics (ICTG). The papers address the geotechnical challenges in design, construction, maintenance, monitoring, and upgrading of roads, railways, airfields, and harbor facilities and other ground transportation infrastructure with the goal of providing safe, economic, environmental, reliable and sustainable infrastructures. This volume will be of interest to postgraduate students, academics, researchers, and consultants working in the field of civil and transport infrastructure.
Author: E. Tutumluer
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 180
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 445: Practices for Unbound Aggregate Pavement Layers consolidates information on the state-of-the-art and state-of-the-practice of designing and constructing unbound aggregate pavement layers. The report summarizes effective practices related to material selection, design, and construction of unbound aggregate layers to potentially improve pavement performance and longevity."--Publisher website.
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
ISBN: 1560510552
Category : Pavements
Languages : en
Pages : 622
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Book Description
Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Author: European Conference of Ministers of Transport
Publisher: OECD Publishing
ISBN: 9264008586
Category :
Languages : en
Pages : 116
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Book Description
With maintenance costs accounting for a large proportion of road budgets, this report assesses the economic and technical feasibility of innovative wearing courses for long life road pavements. While having higher initial costs, such wearing courses ...
