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Evaluation Of Tack Coat Bond Strength Tests
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Book Synopsis Evaluation of Tack Coat Bond Strength Tests by : Scott Shuler
Download or read book Evaluation of Tack Coat Bond Strength Tests written by Scott Shuler and published by . This book was released on 2018 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poor bonding between asphalt pavement overlays and the substrate pavement layer can greatly influence the long term performance of hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by using an asphalt emulsion tack coat. Additionally, field staff is charged with determining whether an existing pavement, especially a milled surface, is clean enough prior to tack coat placement, to ensure an adequate bond.
Book Synopsis Performance Evaluation of Tack Coat Materials by : James A. Crovetti
Download or read book Performance Evaluation of Tack Coat Materials written by James A. Crovetti and published by . This book was released on 2012 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tack Coat Testing - Measuring Field Bond Strength by :
Download or read book Tack Coat Testing - Measuring Field Bond Strength written by and published by . This book was released on 2015 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes lessons learned in evaluating the bonding strength of hot mix asphalt (HMA) layers. Testing included: determining an optimal range for the bond strength of a tacked hot mix asphalt interface, and implementing the findings. The research method used a Florida Bond Test fixture along with a Marshall asphalt mixture testing load frame to evaluate tack bond shear strength and deformation. Specimens were obtained from state, county and city paving projects from around Minnesota. Results were compared to related research conducted in the United States. Recommendations for a tack bond test program: Equipment includes the Marshall load frame already used by many HMA laboratories, HMTS software or similar, and the Florida Bond Test apparatus. Follow Minnesota modifications of Florida Bond Test protocol. Compute the average and standard deviation of peak shear stress from specimen sets. Cores exhibiting layer separation during coring or during removal will be included in the specimen set and assigned a peak shear stress of 0 psi. Average peak shear stress will be 100 psi or greater. The standard deviation of peak shear stress will be 25 psi or less.
Book Synopsis Preliminary Investigation of a Test Method to Evaluate Bond Strength of Bituminous Tack Coats by :
Download or read book Preliminary Investigation of a Test Method to Evaluate Bond Strength of Bituminous Tack Coats written by and published by . This book was released on 2004 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory Evaluation of Interface Bond Strength Between Asphalt Layers by : Bimal Thapa
Download or read book Laboratory Evaluation of Interface Bond Strength Between Asphalt Layers written by Bimal Thapa and published by . This book was released on 2017 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: A typical flexible pavement structure used by the Ohio Department of Transportation (ODOT) consists of several layers, including the subgrade, aggregate base, asphalt concrete base, intermediate course, and surface course. A light application of an asphaltic material, referred to as tack coat, is commonly used between the asphalt layers to distribute the stresses between the layers. The objective of this study was to evaluate the interlayer bond strength resulting from the use of three tack coat materials (SS-1h, rubberized tack, and non-tracking tack) commonly used in Ohio. The interface bond strength of laboratory-prepared samples was measured using a specialized fixture developed by Pine Test Equipment, Inc. that allows loading the samples in shear until failure along the interface. This study investigated the effect of the specimen diameter (4-inch and 6-inch), tack coat application rate (0.04 gallon/yd2 and 0.1 gallon/yd2), testing temperature (20°C and 25°C), and loading rate (0.1 inch/min and 2 inch/min) on the interface bond strength. The rheological properties of the three tack coat materials were also evaluated in accordance with AASHTO T 59-09. The highest interface bond strength was observed for the non-tracking tack, followed by the SS-1h and the rubberized tack, which were found to have comparable bond strengths to laboratory samples prepared with no tack coat. The optimum tack coat application rate was found to be dependent on the tack coat material type and the testing conditions (i.e., testing temperature and loading rate). A decrease in the interface bond strength was observed for the rubberized tack with the increase in the tack coat application rate, while an increase in the interface bond strength was noticed for SS-1h and the non-tracking tack with the increase in the tack coat application rate. In general, comparable results were obtained using the 4-inch and the 6-inch samples. As expected, higher interface bond strength was observed at the lower testing temperature for all samples. In addition, a higher interface bond strength was obtained for all samples when using the faster loading rate of 2 inch/min.
Book Synopsis Tack Coat Performance and Materials Study by : Bryan T. Wilson
Download or read book Tack Coat Performance and Materials Study written by Bryan T. Wilson and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A good bond provided by a tack coat can improve performance of asphalt overlays. The objectives of this research were: (1) develop a method for testing the bond between pavement layers; (2) evaluate the bond performance and predict long-term performance of different tack coat strategies; (3) assess the minimum bond to achieve acceptable performance; and (4) evaluate the cost effectiveness of different tack coat strategies. Field test sections were constructed considering surface type, tack type, tack rate, and application method. Core bond performance, initial and after 8-months, was tested in the lab with an interface shear strength tester. Tack type, application method, and bond age were statistically significant variables. Trackless tack had the highest bond performance. High performance was also achieved by SS-1H placed with a distributor, and by notack samples. The rubberized tack and SS-1H placed with a spray paver had the lowest bond performance; however, after eight months, bond performance for these sections doubled and was well acceptable. Performance was predicted considering reflection cracking, rutting, and fatigue cracking. Generally, higher bond strength resulted in longer service life; however, on the milled HMA sections, the optimal performance was achieved at a partially bonded condition. The differences among pavement life-cycle costs for the different materials and methods were small, between 2 and 6 percent of the overall project cost. The shear bond strength test is recommended to evaluate field bond performance. A tack coat construction specification, with a minimum initial bond strength of 70 psi, may be considered for exploratory work.
Book Synopsis Laboratory Evaluation of Tensile and Shear Strengths of Asphalt Tack Coats by : Mark Everett Woods
Download or read book Laboratory Evaluation of Tensile and Shear Strengths of Asphalt Tack Coats written by Mark Everett Woods and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt tack coats are applied during pavement construction to ensure bond between pavement layers, thus providing a more durable pavement. A prototype tack coat evaluation device (TCED) was developed to evaluate the tensile and torque-shear strength of tack coat materials. Three emulsions (SS-1, CSS-1, and CRS-2) and one asphalt binder (PG 67-22), commonly used as tack coats, were evaluated using the TCED at various application temperatures, application rates, dilutions, and set times. A laboratory bond interface strength device (LBISD) was developed to assess interface shear strength of laboratory-prepared specimens. Mass loss testing was performed to evaluate moisture evaporation and visual breaking properties of emulsions. Study results indicate application rate, tack coat, and emulsion set time significantly affect TCED strength. Application rate also affected evaporation rate of emulsions.
Book Synopsis Determining Bond Strength of Micro-surfacing Mixes by : Munir D. Nazzal
Download or read book Determining Bond Strength of Micro-surfacing Mixes written by Munir D. Nazzal and published by . This book was released on 2018 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes Phase 1 research work that was completed to document the current state-of-the-practice for using tack coat with micro-surfacing projects by state and provincial transportation agencies, summarize studies on the evaluation of bond strength between micro-surfacing mixes and existing pavement surface, and identify available tests that are used for measuring the interface bond strength to determine the most appropriate one to use in micro-surfacing applications. A national survey of transportation agencies was conducted to collect information from those agencies on using tack coat for micro-surfacing applications. The survey results indicated that there is no consensus among responding transportation agencies about the importance of using tack coat for micro-surfacing applications. Most agencies that use tack coat with micro-surfacing believe that it is critical for providing adequate bonding with the underlying surface, while the majority of the agencies that do not use tack coat believe that it is not needed, as adequate bonding can be provided by the emulsion in the micro-surfacing mix. However, some agencies that stopped using tack coat with micro-surfacing (such as Indiana DOT and Michigan DOT) have noted some debonding issues and decided or are considering adding a requirement for tack coat usage. The survey results also indicated that none of the responding agencies are performing field tests to evaluate the bonding strength of micro-surfacing mixes. The results of the literature review conducted in Phase 1 of this project indicated that achieving adequate bonding between the micro-surfacing mix and the existing pavement is important to ensure full load transfer between the micro-surfacing layer(s) and the existing pavement. In addition, some studies suggested that the agencies that do not require using tack coat with micro-surfacing assume that the consistency of the micro-surfacing mix permits it to be evenly spread over the pavement surface, forming an adequate bond to the surface. The literature review was used to identify several candidate tests for the evaluation of the bond strength of micro-surfacing mixes. Based on the results of Phase 1 it was recommended that the testing matrix for Phase 2 include the following variables: Existing surface conditions, micro-surfacing mix type, micro-surfacing mix residual binder content, tack coat application rate, and tack coat material type. It was also recommended that the variables be evaluated through a field-testing program. Furthermore, it was recommended to consider two types of field bond strength tests for Phase 2: pull-off and torque bonding tests.
Book Synopsis Investigation of the Behavior of Asphalt Tack Coat Interface Layer by : Louay Nadhim Mohammad
Download or read book Investigation of the Behavior of Asphalt Tack Coat Interface Layer written by Louay Nadhim Mohammad and published by . This book was released on 2005 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimization of Tack Coat for HMA Placement by : Louay Nadhim Mohammad
Download or read book Optimization of Tack Coat for HMA Placement written by Louay Nadhim Mohammad and published by Transportation Research Board. This book was released on 2012 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Report 712: Optimization of Tack Coat for HMA Placement presents proposed test methods for measuring the quality and performance characteristics of tack coat in the laboratory and the field, and includes a training manual presenting proposed construction and testing procedures for tack coat materials.
Book Synopsis Evaluation Tests of Epon-asphalt Pavement by : Waterways Experiment Station (U.S.)
Download or read book Evaluation Tests of Epon-asphalt Pavement written by Waterways Experiment Station (U.S.) and published by . This book was released on 1960 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Interlaboratory Testing and Evaluation of Bituminous Materials by : Manfred N. Partl
Download or read book Advances in Interlaboratory Testing and Evaluation of Bituminous Materials written by Manfred N. Partl and published by Springer Science & Business Media. This book was released on 2012-10-17 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: This STAR on asphalt materials presents the achievements of RILEM TC 206 ATB, acquired over many years of interlaboratory tests and international knowledge exchange. It covers experimental aspects of bituminous binder fatigue testing; the background on compaction methods and imaging techniques for characterizing asphalt mixtures including validation of a new imaging software; it focuses on experimental questions and analysis tools regarding mechanical wheel tracking tests, comparing results from different labs and using finite element techniques. Furthermore, long-term rutting prediction and evaluation for an Austrian road are discussed, followed by an extensive analysis and test program on interlayer bond testing of three different test sections which were specifically constructed for this purpose. Finally, the key issue of manufacturing reclaimed hot mix asphalt in the laboratory is studied and recommendations for laboratory ageing of bituminous mixtures are given.
Book Synopsis Development of Technologies to Evaluate Hot Mix Asphalt Adhesion Through Tack Coat by : Aiman Mustafa H. Mahmoud
Download or read book Development of Technologies to Evaluate Hot Mix Asphalt Adhesion Through Tack Coat written by Aiman Mustafa H. Mahmoud and published by . This book was released on 2016 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexible pavements consist of multilayers, which form the pavement structures. Since the strength of the bond at interface between layers plays a significant role in improving the structural integri-ty and the performance of pavement structures, tack coat materials and methods used for their application during construction are important in providing an adequate bond strength between pavement lifts. Tack coat is a bituminous liquid asphalt (a mixture of water, asphalt binder, and an emulsifying agent) and usually applied to provide a bond between pavement lifts. The absence of the tack coat adhesion at the interface between layers leads to increased stresses in the pave-ment structure. An inspection procedure to monitor the performance of the interlayer bond dur-ing the pavement use phase and identifying bond failures is critical to improve pavement man-agement systems and develop more effective pavement design strategies. In this study, two dif-ferent devices were developed at Oregon State University to evaluate the tack coat performance in the field. First, the wireless Oregon Field Tack Coat Tester (OFTCT) device was developed to predict the long-term performance of the in-situ tack coat bond strength and to evaluate the impact of pave-ment surface cleanliness before tack coat application on bond strength. Correlations between OFTCT field test results and the results of laboratory shear tests conducted with cores taken from the field were investigated to determine the effectiveness of the OFTCT tests. A new heat-ing system (an adjustable heat gun and environmental chamber) was developed to reduce the tack coat’s curing time in the field and control temperature during testing. The results indicated that the OFTCT device can be successfully utilized in the field to differentiate between clean and dusty surfaces before tack coat application. By using wireless sensors controlled by a laptop, practicality of the device was improved to reduce the testing time. The correlation between OFTCT and laboratory shear test results was determined to be statistically significant (R2 = 0.5189). OFTCT was able to identify the tack coats with high and low interlayer shear strength (ISS). Second, a new low cost field test device, Oregon Field Torque Tester (OFTT), was developed to evaluate the long-term post-construction tack coat performance of pavement sections. Correla-tions between OFTT field test results and the results of laboratory shear tests conducted with cores taken from the field were investigated to determine the effectiveness of the OFTT tests. The peak torque values at failure measured by the OFTT were observed to be highly correlated with the measured lab shear strengths. To conclude, both of the developed devices are expected to be adapted as field tests to evaluate the performance of tack coats in the field and to mitigate pavement distresses observed on roadways.
Book Synopsis 7th RILEM International Conference on Cracking in Pavements by : A. Scarpas
Download or read book 7th RILEM International Conference on Cracking in Pavements written by A. Scarpas and published by Springer Science & Business Media. This book was released on 2012-08-30 with total page 1340 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the recent past, new materials, laboratory and in-situ testing methods and construction techniques have been introduced. In addition, modern computational techniques such as the finite element method enable the utilization of sophisticated constitutive models for realistic model-based predictions of the response of pavements. The 7th RILEM International Conference on Cracking of Pavements provided an international forum for the exchange of ideas, information and knowledge amongst experts involved in computational analysis, material production, experimental characterization, design and construction of pavements. All submitted contributions were subjected to an exhaustive refereed peer review procedure by the Scientific Committee, the Editors and a large group of international experts in the topic. On the basis of their recommendations, 129 contributions which best suited the goals and the objectives of the Conference were chosen for presentation and inclusion in the Proceedings. The strong message that emanates from the accepted contributions is that, by accounting for the idiosyncrasies of the response of pavement engineering materials, modern sophisticated constitutive models in combination with new experimental material characterization and construction techniques provide a powerful arsenal for understanding and designing against the mechanisms and the processes causing cracking and pavement response deterioration. As such they enable the adoption of truly "mechanistic" design methodologies. The papers represent the following topics: Laboratory evaluation of asphalt concrete cracking potential; Pavement cracking detection; Field investigation of pavement cracking; Pavement cracking modeling response, crack analysis and damage prediction; Performance of concrete pavements and white toppings; Fatigue cracking and damage characterization of asphalt concrete; Evaluation of the effectiveness of asphalt concrete modification; Crack growth parameters and mechanisms; Evaluation, quantification and modeling of asphalt healing properties; Reinforcement and interlayer systems for crack mitigation; Thermal and low temperature cracking of pavements; and Cracking propensity of WMA and recycled asphalts.
Book Synopsis 8th RILEM International Conference on Mechanisms of Cracking and Debonding in Pavements by : Armelle Chabot
Download or read book 8th RILEM International Conference on Mechanisms of Cracking and Debonding in Pavements written by Armelle Chabot and published by Springer. This book was released on 2016-05-25 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest advances in research to analyze mechanical damage and its detection in multilayer systems. The contents are linked to the Rilem TC241 - MCD scientific activities and the proceedings of the 8th RILEM International Conference on Mechanisms of Cracking and Debonding in Pavements (MCD2016). MCD2016 was hosted by Ifsttar and took place in Nantes, France, on June 7-9, 2016. In their lifetime, pavements undergo degradation due to different mechanisms of which cracking is among the most important ones. The damage and the fracture behavior of all its material layers as well as interfaces must be understood. In that field, the research activities aims to develop a deeper fundamental understanding of the mechanisms responsible for cracking and debonding in asphalt concrete and composite (e.g. asphalt overlays placed on PCC or thin cement concrete overlay placed on asphalt layer) pavement systems.
Book Synopsis Accelerated Pavement Testing to Transport Infrastructure Innovation by : Armelle Chabot
Download or read book Accelerated Pavement Testing to Transport Infrastructure Innovation written by Armelle Chabot and published by Springer Nature. This book was released on 2020-08-25 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of accelerated pavement testing (APT), presented at the 6th International Conference on Accelerated Pavement Testing, in Nantes, France, in April 2022. Discussing APT, which involves rapid testing of full-scale pavement constructions for structural deterioration, the book covers topics such as APT facilities, APT of asphalt concrete and sustainable/innovative materials, APT for airfield pavements, testing of maintenance and rehabilitation solutions, testing of smart and multi-functional pavements, data analysis and modeling, monitoring and non-destructive testing, and efficient means of calibrating/developing pavement design methods. Featuring peer-reviewed contributions by leading international researchers and engineers, the book is a timely and highly relevant resource for materials scientists and engineers interested in determining the performance of pavement structures during their service life (10+ years) in a few weeks or months.
Book Synopsis 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials by : Francesco Canestrari
Download or read book 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials written by Francesco Canestrari and published by Springer. This book was released on 2015-09-24 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the results of RILEM TC 237-SIB (Testing and characterization of sustainable innovative bituminous materials and systems). The papers have been selected for publication after a rigorous peer review process and will be an invaluable source to outline and clarify the main directions of present and future research and standardization for bituminous materials and pavements. The following topics are covered: - Characterization of binder-aggregate interaction - Innovative testing of bituminous binders, additives and modifiers - Durability and aging of asphalt pavements - Mixture design and compaction analysis - Environmentally sustainable materials and technologies - Advances in laboratory characterization of bituminous materials - Modeling of road materials and pavement performance prediction - Field measurement and in-situ characterization - Innovative materials for reinforcement and interlayer systems - Cracking and damage characterization of asphalt pavements - Recycling and re-use in road pavements This is the proceedings of the RILEM SIB2015 Symposium (Ancona, Italy, October 7-9, 2015).
