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Author: Gavin P. Gautreau
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 138
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Book Description
This report documents the research efforts conducted at the Louisiana Transportation Research Center (LTRC) regarding chemical stabilization of the naturally wet and problematic clayey soils typically found as subgrade in south Louisiana and provides detailed information on experiment design, instrumentation, and field and laboratory tests. The objectives of the study included the exploration and development of a methodology to build reliable and conservatively achievable subgrade layers, stabilized with cementitious agents at various field moisture contents so that a treated subgrade layer would not only provide a working table for pavement construction, but could also function as a pavement subbase layer that contributes to the overall pavement structural capacity. Three additives were studied throughout this research: cement, lime, and lime-fly ash. Testing included moisture density evaluations, various additive percentages, various molding moistures and curing times, tube suction testing, resilient modulus and permanent deformation, Eades and Grim tests, and Accelerated Loading Facility (ALF) tests on similar full-scale pavement sections with cement-stabilized and lime-treated subgrades with the magnitude of the ALF loads kept at 9,750 lb. for the first 200,000 repetitions then increased in incremental intervals of 2,300 lb.
Author: Gavin P. Gautreau
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 138
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Book Description
This report documents the research efforts conducted at the Louisiana Transportation Research Center (LTRC) regarding chemical stabilization of the naturally wet and problematic clayey soils typically found as subgrade in south Louisiana and provides detailed information on experiment design, instrumentation, and field and laboratory tests. The objectives of the study included the exploration and development of a methodology to build reliable and conservatively achievable subgrade layers, stabilized with cementitious agents at various field moisture contents so that a treated subgrade layer would not only provide a working table for pavement construction, but could also function as a pavement subbase layer that contributes to the overall pavement structural capacity. Three additives were studied throughout this research: cement, lime, and lime-fly ash. Testing included moisture density evaluations, various additive percentages, various molding moistures and curing times, tube suction testing, resilient modulus and permanent deformation, Eades and Grim tests, and Accelerated Loading Facility (ALF) tests on similar full-scale pavement sections with cement-stabilized and lime-treated subgrades with the magnitude of the ALF loads kept at 9,750 lb. for the first 200,000 repetitions then increased in incremental intervals of 2,300 lb.
Author: Zhong Wu
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 83
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Book Description
Author: Louay N. Mohammad
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 73
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Book Description
Author: Zhong Wu
Publisher:
ISBN:
Category : Accelerated life testing
Languages : en
Pages : 2
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Book Description
PROBLEM: The full-scale accelerated pavement testing (APT) provides a unique tool for pavement engineers to directly collect pavement performance and failure data under heavy wheel loading. However, running a full-scale APT experiment is very expensive. Only a few selected pavement structures/materials can be tested using APT. Therefore, computer simulation of APT becomes a logical direction to expand the benefit from an APT study. Currently, no computer programs in the literature are able (or suitable) to predict the pavement rutting performance developed in a pavement structure containing chemically stabilized base or sub-base layers, such as cement treated or stabilized soils, slag or fly-ash treated BCS materials, and lime-treated soils as investigated currently at the Louisiana Transportation Research Center (LTRC). OBJECTIVE: The objective of this research is to develop a finite element (FE) model to simulate performance of pavement structures, specifically for rutting performance of the chemically stabilized base/sub-base materials, under accelerated loading. Initial validation of the model will be performed using results from a current LTRC study: Accelerated Loading Evaluation of a Sub-base Layer on Pavement Performance (ALF Experiment 4).
Author: Frederick Hugo
Publisher: Transportation Research Board
ISBN: 0309069742
Category : Accelerated life testing
Languages : en
Pages : 213
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 325: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes the findings from the various experimental activities associated with full-scale accelerated pavement testing programs.
Author: José P. Aguiar-Moya
Publisher: Springer
ISBN: 3319427970
Category : Technology & Engineering
Languages : en
Pages : 877
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Book Description
This compendium gathers the latest advances in the area of Accelerated Pavement Testing (APT), a means of testing full-scale pavement construction in an accelerated manner for structural deterioration in a very short term. Compiling novel research results presented at the 5th International Conference on Accelerated Pavement Testing, San Jose, Costa Rica, the volume serves as a timely and highly relevant resource for materials scientists and engineers interested in determining the performance of a pavement structure during its service life (10+ years) in a few weeks or months.
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:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 194
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Book Description
The Midwest States Accelerated Pavement Testing Pooled Fund Program, financed by the highway departments of Missouri, Iowa, Kansas and Nebraska, has supported an accelerated pavement testing (APT) project to compare the performance of stabilized clayey embankment soil when Portland cement, fly ash, lime and a commercial product were used as stabilizing agents. The project aimed to improve the practices related to the design of flexible pavements when the top of the subgrade is improved by chemical stabilization. The experiments were conducted at the Civil Infrastructure Systems Laboratory (CISL) of Kansas State University. The test program consisted of constructing four flexible pavement structures and subjecting them to full-scale accelerated loading test. The study indicated that cement and lime are the most effective stabilizers for the studied soil. These stabilizers resulted in lower vertical compressive stresses at the top of the subgrade and lower rut depth at the pavement surface than the fly ash-treated soil. After more than two million axle load repetitions, the pavement with cement stabilized embankment soil exhibited much less surface cracking than the pavement with fly-ash stabilized embankment. The commercial product proved not to be effective in stabilizing the non-sulfate clayey soil used in this experiment, when the embankment is constructed at the same moisture content and compaction level as for the other three chemicals. The unconfined compression strength measured on laboratory prepared samples of soil stabilized with the commercial chemical compound was very similar to that of the untreated soil.
Author: Wynand JvdM. Steyn
Publisher: Transportation Research Board
ISBN: 0309223660
Category : Technology & Engineering
Languages : en
Pages : 257
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 433: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes significant findings from the various experimental activities associated with full-scale accelerated pavement testing (f-sAPT) programs that have taken place between 2000 and 2011. The report also identifies gaps in knowledge related to f-sAPT and where future research may be needed. NCHRP Synthesis 433 is designed to expand the f-sAPT base of knowledge documented in NCHRP Syntheses 325 and 235, both with the same title of Significant Findings from Full-Scale Accelerated Pavement Testing. f-sAPT is the controlled application of a wheel loading, at or above the appropriate legal load limit, to a pavement system to determine pavement response in a compressed time period. The acceleration of damage is achieved by one or more of the following factors: increased repetitions, modified loading conditions, imposed climatic conditions, and thinner pavements with a decreased structural capacity which have shorter design lives"--
Author: Waterways Experiment Station (U.S.). Soils and Pavements Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
