Laboratory-Measured Dynamic Modulus and Predicted Performance of Asphalt Mixtures

2015 ◽  
Vol 2507 (1) ◽  
pp. 78-89
Author(s):  
Samuel B. Cooper ◽  
Louay N. Mohammad ◽  
Mostafa A. Elseifi ◽  
Amar Raghavendra
Keyword(s):  
Performance Prediction ◽  
Dynamic Modulus ◽  
Axial Loading ◽  
Fatigue Cracking ◽  
Asphalt Mixtures ◽  
Experimental Program ◽  
Dynamic Moduli ◽  
Loading Mode ◽  
Dynamic Modulus Test ◽  
Pavement Performance Prediction

The dynamic modulus testing of asphalt mixtures is typically conducted by using a specimen 100 mm in diameter and 150 mm tall loaded along its primary axis (axial mode). This specimen orientation can present problems when as-built pavement layers, which are seldom constructed in 150-mm lifts, are evaluated. For this issue to be addressed, dynamic modulus testing in the indirect tension (IDT) loading mode was proposed. The objective of this study was to evaluate the influence of loading mode (axial versus IDT) on the measured dynamic modulus and the effects of the measured difference on pavement performance prediction. For the achievement of these objectives, Superpave® mixtures were collected from Florida, Iowa, Louisiana, Michigan, Minnesota, South Dakota, Virginia, and Wisconsin and were evaluated for the effects of loading mode. Results of the experimental program showed that statistical differences exist between IDT and uniaxial dynamic modulus values measured at different temperatures and frequencies. When the precision of the dynamic modulus test was considered, differences attributable to the loading mode (IDT versus axial) were observed for measurements conducted at all temperatures, with the dynamic moduli measured in the axial loading mode being stiffer than the dynamic moduli measured in the IDT loading mode. Results also showed that performance prediction was significantly affected by the loading mode. Predicted rutting and fatigue cracking in the asphalt layer were the most influenced distresses. Correlation factors were developed to correlate one set of dynamic moduli to the moduli measured in a different loading mode.

Dynamic Modulus of Asphalt Mixtures

2015 ◽  
Vol 2507 (1) ◽  
pp. 67-77 ◽  
Author(s):  
Samuel B. Cooper ◽  
Louay N. Mohammad ◽  
Mostafa A. Elseifi ◽  
Amar Raghavendra
Keyword(s):  
Performance Prediction ◽  
Dynamic Modulus ◽  
Complex Modulus ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Pavement Performance ◽  
Maximum Aggregate Size ◽  
Production Plant ◽  
Pavement Distress ◽  
Pavement Performance Prediction

Mix properties that deviate appreciably from the design properties during the production and construction of asphalt mixtures can lead to premature pavement distress or even failure. The objective of this study was to quantify the differences in the dynamic modulus of specimens prepared during design, production, and construction of dense-graded asphalt pavements and their effects on pavement performance prediction. For the achievement of this objective, Superpave® mixtures were collected from Iowa, Florida, Virginia, Michigan, South Dakota, Louisiana, Minnesota, and Wisconsin during design [laboratory-mixed and laboratory-compacted (LL)], production [plant-produced and laboratory-compacted (PL)], and construction [plant-produced and field-compacted (PF) specimens]. The nominal maximum aggregate size was kept constant at 12.5 mm. An indirect tension dynamic complex modulus (IDT | E*|) was measured for the three specimen types (i.e., LL, PL, and PF). Results showed that laboratory-compacted and field-compacted specimens exhibited large and significant differences. This finding was attributed to differences in the compaction effort and procedure between the field and the laboratory. Results of the AASHTOWare Pavement ME Design showed that the use of dynamic moduli obtained from different specimen types would result in significant differences in pavement performance prediction. This research was part of NCHRP Project 9-48, Field Versus Laboratory Volumetrics and Mechanical Properties.

Development of Performance-Related Specifications for Hot-Mix Asphalt Pavements Through WesTrack

1997 ◽  
Vol 1575 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Stephen B. Seeds ◽  
Rudramunniyappa Basavaraju ◽  
Jon A. Epps ◽  
Richard M. Weed
Keyword(s):  
Performance Prediction ◽  
Prediction Models ◽  
Hot Mix Asphalt ◽  
Permanent Deformation ◽  
Fatigue Cracking ◽  
Primary Objective ◽  
Pavement Performance ◽  
Void Content ◽  
Target Values ◽  
Pavement Performance Prediction

The primary objective of the FHWA-sponsored WesTrack project is to further the development of performance-related specifications for hotmix asphalt construction. This objective is being achieved, in part, through the accelerated loading of a full-scale test track facility in northern Nevada. Twenty-six hot-mix asphalt test sections constructed to meet the criteria set forth in a statistically based experiment design are providing performance data that will be used to improve existing (or develop new) pavement performance prediction relationships that better account for the effects that “off-target” values of asphalt content, air-void content, and aggregate gradation have on such distress factors as fatigue cracking, permanent deformation, roughness, raveling, and tirepavement friction. The concept of the planned new performance-related specification and how it will incorporate the modified pavement performance prediction models are described. The current plan for assessing contractor pay adjustments (i.e., penalties and bonuses) based on data collected from the as-constructed pavement is also discussed.

Characteristic Analysis of Dynamic Modulus for High Modulus Asphalt Concrete

2014 ◽  
Vol 505-506 ◽  
pp. 15-18 ◽  
Author(s):  
Xiao Long Zou ◽  
Ai Min Sha ◽  
Wei Jiang ◽  
Xin Yan Huang
Keyword(s):  
Dynamic Modulus ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
High Modulus ◽  
Characteristic Analysis ◽  
Modified Asphalt ◽  
Universal Testing ◽  
Different Temperatures ◽  
Dynamic Modulus Test

In order to analyze the characteristics of high modulus asphalt mixture dynamic modulus, Universal Testing Machine (UTM-25) was used for dynamic modulus test of three kinds of mixtures, which were PR Module modified asphalt mixture and PR PLAST.S modified asphalt mixture and virgin asphalt mixture, to investigate dynamic modulus and phase angle at different temperatures and frequencies. The results indicate that: the dynamic modulus order of the three asphalt mixtures is PR MODULE > PR PLAST.S > Virgin. PR MODULE asphalt mixture dynamic modulus is much larger than the other two.

scholarly journals Comparative Study on Complex Modulus and Dynamic Modulus of High-Modulus Asphalt Mixture

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1502
Author(s):  
Licheng Guo ◽  
Qinsheng Xu ◽  
Guodong Zeng ◽  
Wenjuan Wu ◽  
Min Zhou ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Complex Modulus ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Design System ◽  
High Modulus ◽  
Stiffness Modulus ◽  
Two Systems ◽  
Value Range ◽  
Dynamic Modulus Test

In the French high-modulus asphalt mixture design system, the complex modulus of the mixture under the conditions of 15 °C and 10 Hz is taken as the design index. However, in China, the dynamic modulus under the conditions of 15 °C, 10 Hz, 20 °C, 10 Hz and 45 °C, 10 Hz was taken as the stiffness modulus index of high-modulus asphalt mixture. The difference in modulus values between the two systems caused the pavement structure layer to be thicker and the construction cost to be higher in China. In order to find out the appropriate modulus value of high-modulus asphalt mixture suitable for China’s modulus parameter conditions to better carry out the reasonable design and evaluation of high-modulus asphalt mixture in China, the modulus of four types of high-modulus asphalt mixtures under the two systems through the two-point bending complex modulus test of the CRT-2PT trapezoidal beam and the SPT uniaxial compression dynamic modulus test were analyzed in this paper. Under the premise of meeting the stiffness modulus index of the French high-modulus asphalt mixture, the relationship conversion models between the dynamic modulus and complex modulus of high-modulus asphalt mixture under different temperatures were established. According to the conversion models, the design evaluation value range of dynamic modulus suitable for China’s condition was recommended. It is recommended that the dynamic modulus of China’s high-modulus asphalt mixture at 15 °C and 10 Hz is not less than 16,000 MPa, the dynamic modulus at 20 °C and 10 Hz is not less than 14,000 MPa, and the dynamic modulus at 45 °C and 10 Hz is not less than 2500 MPa. Five kinds of high-modulus asphalt mixtures used in actual road engineering were tested to verify the reliability of the recommended dynamic modulus values based on the modulus conversion model, and the results are consistent with the recommended value range of the model.

Study on Dynamic Modulus of Waste Plastic Modified Asphalt Mixture Using Waste Plastic Bag Chips

2011 ◽  
Vol 261-263 ◽  
pp. 824-828 ◽  
Author(s):  
Qian Zhang ◽  
Shu Wei Goh ◽  
Zhan Ping You
Keyword(s):  
Phase Angle ◽  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Control Sample ◽  
Asphalt Mixtures ◽  
Test Results ◽  
Waste Plastic ◽  
Modified Asphalt ◽  
Plastic Bag ◽  
Dynamic Modulus Test

The objective of this study is to investigate the possibility of using waste plastic as an additive to modify asphalt mixtures thereby reducing the waste plastic stream in our environment. High density polyethylene plastic bags obtained from the retail store were shredded into chips and added into asphalt mixtures at the rate of 0% (control sample), 2, 5 and 8% based on binder weight. Three different temperatures of 4, 21.3 and 39.2°C and frequencies ranging from 0.1 to 25 Hz were used in the dynamic modulus test. It was found that most of the asphalt mixtures modified with waste plastic have higher dynamic modulus when compared with the control samples. However, no significant trend on phase angle was found among all the samples tested based on the test results. In this study, it was found that the modified asphalt mixture with 2% waste plastic had the highest dynamic modulus and phase angle. Based on the test results, it was found that plastic modified asphalt mixture will have a better performance under intermediate and high temperature conditions.

Evaluation of select warm mix additives with polymer and rubber modified asphalt mixtures

2015 ◽  
Vol 42 (6) ◽  
pp. 377-388 ◽  
Author(s):  
Zahi Chamoun ◽  
Mena I. Souliman ◽  
Elie Y. Hajj ◽  
Peter Sebaaly
Keyword(s):  
Fatigue Testing ◽  
Research Effort ◽  
Fatigue Cracking ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Experimental Program ◽  
Modified Asphalt ◽  
Warm Mix Additives ◽  
The Impact

Warm mix technologies are being increasingly investigated in an effort to conserve energy, reduce emissions, and extend paving season. Most of the laboratory research conducted to date on warm mix technologies has been concentrated on studying the impact of warm mix technologies on unmodified asphalt binders. This research effort evaluates the use of select warm mix additives with unmodified, polymer-modified, and terminal blend tire rubber asphalt mixtures from Nevada and California. The study evaluated two different warm mix asphalt (WMA) technologies: Sasobit and Advera. The experimental program evaluated the resistance to moisture damage and rutting of different mixtures with and without liquid anti-strip and lime. Additionally, fatigue resistance of modified and unmodified asphalt mixtures without anti-strip was conducted. In this research effort, the unmodified WMA mixtures were able to achieve mixing temperature reductions of 26.7 to 29.4 °C while the modified WMA mixtures were able to achieve mixing temperature reductions of 16.7 to 25.0 °C compared to their corresponding HMA control mixtures. The results showed that the use of modified binders with WMA technologies and anti-strip additives can result in mixtures with a better resistance to moisture damage compared to unmodified mixtures. Additionally, the combination of modified asphalt binders with lime will eventually generate better resisting mixtures to permanent deformation. Moreover, the resistance to fatigue cracking of HMA and WMA mixtures was also enhanced using modified asphalt binders. Furthermore, a mechanistic fatigue analysis using 3D-Move software confirmed the outcomes of fatigue testing.

Using Dynamic Modulus Test to Evaluate Moisture Susceptibility of Asphalt Mixtures

2009 ◽  
Vol 2127 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Atish A. Nadkarni ◽  
Kamil E. Kaloush ◽  
Waleed A. Zeiada ◽  
Krishna Prapoorna Biligiri
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Mixtures ◽  
Moisture Susceptibility ◽  
Dynamic Modulus Test

scholarly journals Rutting Performance of Semi-Rigid Base Pavement in RIOHTrack and Laboratory Evaluation

2021 ◽  
Vol 7 ◽  
Author(s):  
Sheng Li ◽  
Mengmeng Fan ◽  
Lukai Xu ◽  
Wendi Tian ◽  
Huanan Yu ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixtures ◽  
Rigid Base ◽  
Test Results ◽  
Full Scale Test ◽  
Rutting Resistance ◽  
Test Track ◽  
Dynamic Modulus Test ◽  
Scale Test

Through a simple performance dynamic modulus test (SPT), standard rutting test, Hamburg rutting test, French rutting test and asphalt pavement analyzer rutting test, the rutting resistance of asphalt mixtures in the middle and lower courses of three semi-rigid base asphalt pavement of Beijing full-scale test track road in China was evaluated. The test results show that the rutting resistance of asphalt mixtures of the middle and lower courses can be greatly improved by using low-grade asphalt, especially 30# asphalt. The rutting resistance of SBS modified asphalt mixtures is also better. The SPT dynamic modulus test can indirectly characterize the rutting performance of the asphalt mixture. The rutting test results of a laser road detection vehicle and 3 m ruler show that the asphalt grade has a significant impact on the rutting performance of semi-rigid base asphalt pavement. Compared with 70# asphalt used in the middle and lower courses, the rutting resistance of the pavement structure can be improved by more than 20%. The result also show that the APA rutting test results can closely characterize the full-scale test track results, which is an optimal test method for evaluating the rutting performance of semi-rigid base asphalt pavement. The research results can provide a theoretical basis and reference for the rational design and rutting evaluation of semi-rigid base asphalt pavement.

Dynamic Modulus Characteristic of Large Stone Permeable Asphalt Mixtures

2013 ◽  
Vol 423-426 ◽  
pp. 1110-1113
Author(s):  
Jin Cheng Wei ◽  
Jin Li
Keyword(s):  
Phase Angle ◽  
Dynamic Modulus ◽  
Asphalt Mixtures ◽  
Sigmoidal Function ◽  
Master Curves ◽  
Low Frequencies ◽  
High Frequencies ◽  
Modified Asphalt ◽  
Large Stone ◽  
Dynamic Modulus Test

To study the dynamic modulus characteristic of LSPM mixes, dynamic modulus test was conducted for Large Stone Permeable Asphalt Mixtures (LSPM ) with neat asphalt and with modified asphalt and the range of dynamic modulus values for LSPM was determined and the dynamic modulus master curves were developed. The magnitude of the dynamic modulus decreased with an increase in temperature and increased with an increase in the frequency. The phase angle decreased as the frequency increased at low temperature. With temperature increase, there was a transition interval, where the phase angle increased up to frequencies of 0.5 Hz, and then it started to decrease as frequency increased. After the transition interval, the phase angle increased with an increase in frequency. Master curves developed by sigmoidal function showed that LSPM with modified asphalt exhibited higher dynamic modulus values at middle and high frequencies and lower dynamic modulus values at low frequencies.

scholarly journals Dynamic Modulus and Field Performance of Cold-in-Place Recycled Asphalt Pavement

2019 ◽  
Vol 6 (2) ◽  
pp. b1-b7
Author(s):  
M. R. Islam ◽  
S. A. Kalevela ◽  
J. A. Rivera ◽  
T. B. Rashid
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Field Performance ◽  
Fatigue Cracking ◽  
Threshold Values ◽  
Recycled Asphalt ◽  
Transverse Cracking ◽  
Service Period ◽  
Dynamic Modulus Test

This study investigates the dynamic modulus of cold-in-place recycling (CIR) asphalt material and its performance using pavement performance data and laboratory dynamic modulus testing. Colorado Department of Transportation (CDOT) has 37 projects with over 8 million square yards using CIR materials. Sites from ten projects were selected to monitor the performances and collect samples for laboratory testing. Dynamic modulus testing on the CIR cores was conducted by the CDOT. Results show measured distresses of CIR rehabilitation techniques are mostly below the threshold values during the service period. International Roughness Index, rutting, and transverse cracking never exceeded the threshold values during the studied period. Only two CIR pavements exceeded the threshold values for fatigue cracking after 8-10 years of service. Measured distresses of CIR rehabilitation techniques are similar to conventional pavements based on engineering judgment. The laboratory dynamic modulus test results show CIR has about 50 % less dynamic modulus compared to the traditional asphalt mixture. Keywords: asphalt pavement, cold-in-place recycling, dynamic modulus, fatigue cracking, transverse cracking.

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