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Author: Chase Aaron Henrichs Publisher: ISBN: 9781321693843 Category : Civil engineering Languages : en Pages : 114
Book Description
Full depth reclamation (FDR) is a flexible pavement recycling technique that has not been explored in the state of Arkansas. FDR is unique in that it incorporates the entire flexible pavement section as well as a predetermined portion of the underlying base and sub-base materials with a stabilizer to create a new, stronger stabilized base course. Common stabilization techniques include the addition of asphalt emulsion, asphalt foam, or cement. Using the North Carolina emulsion FDR mix design, the Wirtgen foam FDR mix design, and the Portland Cement Association cement FDR mix design, field materials from four Arkansas highways in the Fayetteville Shale and Brown Dense Shale areas were gathered and used to produced laboratory stabilized FDR samples to determine the potential future use of these mix designs in Arkansas. Initial testing to determine mix properties were performed, which included determination of gradation, Atterberg limits, and sand equivalency testing. Optimal stabilizer contents were determined using the indirect tensile strength test for asphalt emulsion and asphalt foam stabilization and the unconfined compressive strength test was used for the cement stabilized samples. Once the mix designs were validated and optimal contents were determined, performance testing began on new samples produced at optimal stabilization contents from two of the highways to determine material characteristics and to determine if the performance tests are valid for use with FDR materials. For the asphalt emulsion and asphalt foam samples, performance testing included dynamic modulus in indirect tension mode, creep compliance, semi-circular bend, and indirect tensile strength. The cement stabilized samples were tested using the tube suction test and the semi-circular bend test. Results indicated dynamic modulus is a viable testing indicator for rutting and low temperature cracking, while creep compliance may not be suitable for FDR materials. The semi-circular bend test indicated that it is a testing option when using asphalt stabilized materials but another option may be needed for cement stabilization. The indirect tensile strength and tube suction tests are quantifiable moisture susceptibility tests that worked well with the FDR materials.
Author: Chase Aaron Henrichs Publisher: ISBN: 9781321693843 Category : Civil engineering Languages : en Pages : 114
Book Description
Full depth reclamation (FDR) is a flexible pavement recycling technique that has not been explored in the state of Arkansas. FDR is unique in that it incorporates the entire flexible pavement section as well as a predetermined portion of the underlying base and sub-base materials with a stabilizer to create a new, stronger stabilized base course. Common stabilization techniques include the addition of asphalt emulsion, asphalt foam, or cement. Using the North Carolina emulsion FDR mix design, the Wirtgen foam FDR mix design, and the Portland Cement Association cement FDR mix design, field materials from four Arkansas highways in the Fayetteville Shale and Brown Dense Shale areas were gathered and used to produced laboratory stabilized FDR samples to determine the potential future use of these mix designs in Arkansas. Initial testing to determine mix properties were performed, which included determination of gradation, Atterberg limits, and sand equivalency testing. Optimal stabilizer contents were determined using the indirect tensile strength test for asphalt emulsion and asphalt foam stabilization and the unconfined compressive strength test was used for the cement stabilized samples. Once the mix designs were validated and optimal contents were determined, performance testing began on new samples produced at optimal stabilization contents from two of the highways to determine material characteristics and to determine if the performance tests are valid for use with FDR materials. For the asphalt emulsion and asphalt foam samples, performance testing included dynamic modulus in indirect tension mode, creep compliance, semi-circular bend, and indirect tensile strength. The cement stabilized samples were tested using the tube suction test and the semi-circular bend test. Results indicated dynamic modulus is a viable testing indicator for rutting and low temperature cracking, while creep compliance may not be suitable for FDR materials. The semi-circular bend test indicated that it is a testing option when using asphalt stabilized materials but another option may be needed for cement stabilization. The indirect tensile strength and tube suction tests are quantifiable moisture susceptibility tests that worked well with the FDR materials.
Author: Sadie Casillas Publisher: ISBN: Category : Languages : en Pages : 388
Book Description
To maximize the life and quality of a pavement, proper maintenance and rehabilitation are essential. Strategies for pavement rehabilitation with many sustainable benefits are pavement recycling. This dissertation focuses on two types of in-situ pavement recycling: Cold in-place recycling (CIR) stabilized with asphalt emulsion and full depth reclamation (FDR) stabilized with asphalt emulsion or foamed asphalt. One white paper (Chapter 2), two accepted peer reviewed journal articles (Chapters 3 and 4), and one submitted peer reviewed journal article (Chapter 5) are presented in this document to create better understanding of the unique material characterization of asphalt emulsion cold recycled materials, along with factors which influence characterization, pertaining to the measurement of workability, compactability, and cohesion gain. In Chapter 2, a detailed review of the progression of mix design procedures for unbound granular materials (UGM), fully bound hot mix asphalt (HMA), and semi-bound asphalt emulsion CIR is presented to establish the current state of mix design for each material type and identify ways the design of asphalt emulsion CIR could become more engineered rather than empirical. Recommendations included development of additional guidance on use of active and inert fillers, a methodology to account for workability and compactability during mix design, curing procedures which more closely mimic conditions in the field to improve cohesion gain, and a procedure for determination of optimum water content. In Chapter 3, a study was conducted to evaluate different laboratory compaction methods for compaction of asphalt emulsion and foamed asphalt FDR. Both the Proctor hammer, typically used for UGM, and the Superpave Gyratory Compactor (SGC), typically used for HMA, were compared by evaluating densities, tensile strengths, and compaction metrics of FDR samples produced using each method. The modified Proctor hammer produced samples with the highest dry unit weights; however, samples produced using the SGC had higher tensile strengths, indicating compaction method affects material properties. Chapter 4 evaluates different test methods and equipment commonly available in asphalt laboratories for ability to quantify workability, compactability, and cohesion gain of asphalt emulsion CIR by measuring differences in performance due to changes in laboratory curing conditions. Cure temperature was found to have a more significant influence on test results than cure time. SGC metrics were recommended for quantifying workability and compactability. The direct shear test showed promise for quantifying cohesion gain. Finally, Chapter 5 measured effects of various sample fabrication factors on measurement of workability, compactability, and cohesion gain in order to address open questions associated with asphalt emulsion CIR laboratory procedures. Curing temperature most significantly influenced workability and compactability; while cohesion gain was more significantly influenced by mixing temperature and specimen test temperature. The direct shear test again showed promise for measuring cohesion gain of asphalt emulsion CIR. Therefore, a draft specification for this test method was prepared and is included as an appendix of this dissertation. A singular test method for quantifying workability and compactability for asphalt emulsion CIR has not yet been identified due to multiple mechanisms at play during mixing and compaction stages for this material.
Author: Wynand JvdM. Steyn Publisher: Transportation Research Board ISBN: 0309223660 Category : Technology & Engineering Languages : en Pages : 257
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: Inge Hoff Publisher: CRC Press ISBN: 1000533336 Category : Technology & Engineering Languages : en Pages : 501
Book Description
Innovations in Road, Railway and Airfield Bearing Capacity – Volume 1 comprises the first part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.
Author: Masaki Kitazume Publisher: CRC Press ISBN: 0203589637 Category : Technology & Engineering Languages : en Pages : 436
Book Description
The Deep Mixing Method (DMM), a deep in-situ soil stabilization technique using cement and/or lime as a stabilizing agent, was developed in Japan and in the Nordic countries independently in the 1970s. Numerous research efforts have been made in these areas investigating properties of treated soil, behavior of DMM improved ground under static and d
Author: Chase Aaron Henrichs
Author: Chase Aaron Henrichs
Author: Sadie Casillas
Author: Wynand JvdM. Steyn
Author: 
Author: Inge Hoff
Author: Wirtgen GmbH.
Author: Asphalt Institute
Author: 
Author: Masaki Kitazume
Author: