Author: Vernon Morgan Moore
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages :
Book Description
Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator's ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.
Evaluation of a Laboratory Accelerated Stripping Simulator for Hot Mix Asphalt Mixes
Author: Vernon Morgan Moore
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages :
Book Description
Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator's ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages :
Book Description
Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator's ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.
EVALUATION OF A LABORATORY ACCELERATED STRIPPING SIMULATOR FOR HOT MIX ASPHALT MIXES.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator?s ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator?s ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.
Laboratory Accelerated Stripping Simulator for Hot Mix Asphalt
Author: M. Shane Buchanan
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 296
Book Description
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 296
Book Description
Laboratory Evaluation of Anti-strip Additives in Hot Mix Asphalt
Author: Bradley J. Putnam
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 178
Book Description
The use of hydrated lime or other liquid anti stripping agents (ASA) is the most common method to improve the moisture susceptibility of asphalt mixes. However, most laboratory test conditions used to evaluate the moisture susceptibility of the mixes are only for a short duration of time. This might not be a good representation of the field conditions (i.e., several months or years of service). Thus, a study to evaluate the effects of conditioning the mixes for longer durations was initiated. Also, another problem with the use of the liquid anti stripping agents is their heat storage stability. This report addresses these two issues, by preparing and testing mixtures made with fresh binder for indirect tensile strength after conditioning the samples for 1, 7, 28, 90 and 180 days, and samples prepared from binder stored for three days at 160° C after conditioning them for 1, 28 and 90 days. The results of this study indicated that hydrated lime and the liquid anti stripping agents were equally effective for the mixes used in this research when conditioned beyond one day. In the case of samples prepared from stored binder, there was no significant difference in the effectiveness of hydrated lime and the liquid anti stripping agents even after conditioning for one day. Though it was observed that none of the ASA treatments performed better than others in the case of samples prepared with stored binder, it was also observed that almost all mixes gave significantly similar wet ITS and TSR values as samples prepared from fresh binder.
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 178
Book Description
The use of hydrated lime or other liquid anti stripping agents (ASA) is the most common method to improve the moisture susceptibility of asphalt mixes. However, most laboratory test conditions used to evaluate the moisture susceptibility of the mixes are only for a short duration of time. This might not be a good representation of the field conditions (i.e., several months or years of service). Thus, a study to evaluate the effects of conditioning the mixes for longer durations was initiated. Also, another problem with the use of the liquid anti stripping agents is their heat storage stability. This report addresses these two issues, by preparing and testing mixtures made with fresh binder for indirect tensile strength after conditioning the samples for 1, 7, 28, 90 and 180 days, and samples prepared from binder stored for three days at 160° C after conditioning them for 1, 28 and 90 days. The results of this study indicated that hydrated lime and the liquid anti stripping agents were equally effective for the mixes used in this research when conditioned beyond one day. In the case of samples prepared from stored binder, there was no significant difference in the effectiveness of hydrated lime and the liquid anti stripping agents even after conditioning for one day. Though it was observed that none of the ASA treatments performed better than others in the case of samples prepared with stored binder, it was also observed that almost all mixes gave significantly similar wet ITS and TSR values as samples prepared from fresh binder.
Evaluation of Stripping for Asphalt Concrete Mixtures Using Accelerated Testing Methods
Author: Changlin Pan
Publisher:
ISBN:
Category : Accelerated life testing
Languages : en
Pages : 20
Book Description
Publisher:
ISBN:
Category : Accelerated life testing
Languages : en
Pages : 20
Book Description
Evaluation of Stripping Propensity of Hot Mix Asphalt Mixtures Using Aggregate Modifiers
Author: Assim M. Hagalwadi
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 308
Book Description
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 308
Book Description
Warm-mix Asphalt Study
Author: David John Jones
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 32
Book Description
Evaluation and Correlation of Lab and Field Tensile Strength Ratio (TSR) Procedures and Values in Assessing the Stripping Potential of Asphalt Mixes
Author: Hussain U. Bahia
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 168
Book Description
Rutting Performance of Airport Hot-Mix Asphalt Characterized by Laboratory Performance Testing, Full-Scale Accelerated Pavement Testing, and Finite Element Modeling
Author: John Ford Rushing
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Hot Mix Asphalt (HMA) laboratory mixture design is intended to provide a durable, rut-resistant mixture for a given traffic type. Current mixture design procedures using the Superpave Gyratory Compactor (SGC) rely on volumetric properties of the compacted mixture to assure reliable performance; however, a definitive performance test does not exist. This study provides guidance for selecting a laboratory performance test for airport HMA mixture designs based on; (a) data analyses of results from four potential laboratory tests, (b) comparisons of laboratory tests results to full-scale accelerated pavement test results, and (c) analyses of results from finite element simulations. The laboratory study evaluated of the repeated load test, the static creep test, the dynamic modulus test, and the Asphalt Pavement Analyzer (APA) test as potential performance tests to accompany airport HMA mixture design with a goal of providing acceptable threshold test results that predict rutting performance under aircraft traffic. Over 340 specimens were tested from 34 asphalt mixtures. Specific criteria for each test method were developed. Next, the test methods and criteria were applied to an HMA mixture design selected for accelerated pavement testing. The full-scale tests applied wheel loads that simulated both military fighter aircraft and heavy cargo aircraft traffic to a pavement constructed to meet typical airport design standards. In the first test, simulating fighter jet aircraft, the tire inflation pressure was 2241 kPa, and the pavement temperature was maintained at 43°C. The second test, simulating cargo aircraft, used a tire inflation pressure of 980 kPa and a pavement temperature of 25°C. As expected, rutting was much more severe in the first test. The full-scale tests were then simulated computationally using finite element modeling. The asphalt layer was modeled using the nonlinear viscoelastic, viscoplastic components of the Pavement Analysis Using Nonlinear Damage Approach (PANDA) model. The pavement sections and wheel loads from the field-tests were recreated using two-dimensional simulations within ABAQUS. The simulations resulted in very high rates of viscoplastic strain for the conditions of the first test, but almost no permanent deformation in the second test. Finally, recommendations for implementing APA criteria into airfield HMA mixture design are presented. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152715
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Hot Mix Asphalt (HMA) laboratory mixture design is intended to provide a durable, rut-resistant mixture for a given traffic type. Current mixture design procedures using the Superpave Gyratory Compactor (SGC) rely on volumetric properties of the compacted mixture to assure reliable performance; however, a definitive performance test does not exist. This study provides guidance for selecting a laboratory performance test for airport HMA mixture designs based on; (a) data analyses of results from four potential laboratory tests, (b) comparisons of laboratory tests results to full-scale accelerated pavement test results, and (c) analyses of results from finite element simulations. The laboratory study evaluated of the repeated load test, the static creep test, the dynamic modulus test, and the Asphalt Pavement Analyzer (APA) test as potential performance tests to accompany airport HMA mixture design with a goal of providing acceptable threshold test results that predict rutting performance under aircraft traffic. Over 340 specimens were tested from 34 asphalt mixtures. Specific criteria for each test method were developed. Next, the test methods and criteria were applied to an HMA mixture design selected for accelerated pavement testing. The full-scale tests applied wheel loads that simulated both military fighter aircraft and heavy cargo aircraft traffic to a pavement constructed to meet typical airport design standards. In the first test, simulating fighter jet aircraft, the tire inflation pressure was 2241 kPa, and the pavement temperature was maintained at 43°C. The second test, simulating cargo aircraft, used a tire inflation pressure of 980 kPa and a pavement temperature of 25°C. As expected, rutting was much more severe in the first test. The full-scale tests were then simulated computationally using finite element modeling. The asphalt layer was modeled using the nonlinear viscoelastic, viscoplastic components of the Pavement Analysis Using Nonlinear Damage Approach (PANDA) model. The pavement sections and wheel loads from the field-tests were recreated using two-dimensional simulations within ABAQUS. The simulations resulted in very high rates of viscoplastic strain for the conditions of the first test, but almost no permanent deformation in the second test. Finally, recommendations for implementing APA criteria into airfield HMA mixture design are presented. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152715
Asphalt Paving Technology 2011
Author: Eugene L. Skok
Publisher: DEStech Publications, Inc
ISBN: 1605950688
Category : Science
Languages : en
Pages : 801
Book Description
Publisher: DEStech Publications, Inc
ISBN: 1605950688
Category : Science
Languages : en
Pages : 801
Book Description