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.

Practical Method to Determine the Effect of Air Voids on the Dynamic Modulus of Asphalt Mixture

2018 ◽  
Vol 2672 (28) ◽  
pp. 462-470
Author(s):  
Xinjun Li ◽  
Jack Youtcheff
Keyword(s):  
Test Temperature ◽  
Dynamic Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Practical Method ◽  
Correction Factors ◽  
Recycled Asphalt ◽  
Air Voids ◽  
Lower Temperature ◽  
Air Void

This study presents a practical method for estimating the effect of air voids on the dynamic modulus of asphalt mixture. Dynamic modulus was predicted for mixes with a large range of air void contents using the construction mix volumetric and binder rheological data from 10 accelerated loading facility (ALF) lanes, following the Witczak and Hirsch methods. A large variety of plant-produced and laboratory-prepared mixtures, including hot- and warm-mix asphalt (HMA and WMA), reclaimed asphalt pavement, and recycled asphalt shingles, was tested for dynamic modulus at different air void contents. The experimentally measured and normalized correction factors were found to be more dependent on test temperature than the frequency. The predicted correction factors were found to match with the experimental data at lower temperature but to be clearly lower at high temperature. A set of correction factors for each test temperature is recommended to practitioners correcting dynamic modulus with variation in air voids in asphalt pavement.

Experimental Study on Dynamic Modulus Master Curve of ATPB Mixture

2011 ◽  
Vol 117-119 ◽  
pp. 1556-1560
Author(s):  
Yan Zhu Pan ◽  
Duan Yi Wang
Keyword(s):  
Dynamic Modulus ◽  
Optimization Design ◽  
Master Curve ◽  
Asphalt Pavement ◽  
Experimental Studies ◽  
Asphalt Mixture ◽  
Working Environment ◽  
Full Time ◽  
Typical Structure ◽  
Dynamic Modulus Test

With the development of long life pavement concept, asphalt treated permeable base (ATPB) has become the typical structure of asphalt pavement in more rain and wet area. In order to effectively analysis and prediction of pavement performance, and targeted design, pavement materials parameters research seems more and more important. This paper uses MTS system to do the dynamic modulus test for ATPB-25 and ATPB-30. During the test, different measuring temperature and load frequency are set according to the working environment of ATPB type asphalt mixture. With the dynamic modulus test results, full time domain dynamic modulus master curve and corresponding master curve equation of ATPB type asphalt mixture are created. These experimental studies can provide high quality parameters for the optimization design and performance analysis of asphalt pavement structure with ATPB and are important to extend the service life of the asphalt pavement.

scholarly journals Long-Term Performance of Pavement Structures with Cold In-Place Recycled Base Course

2021 ◽  
Vol 16 (2) ◽  
pp. 48-65
Author(s):  
Audrius Vaitkus ◽  
Judita Gražulytė ◽  
Andrius Baltrušaitis ◽  
Jurgita Židanavičiūtė ◽  
Donatas Čygas
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Binding Agents ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Base Course ◽  
Surface Distress ◽  
Foamed Bitumen

Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.

Rheological Properties of High Grade Asphalt and its Mixture

2014 ◽  
Vol 599 ◽  
pp. 244-247 ◽  
Author(s):  
Qun Shan Ye ◽  
Chang Jian Ye ◽  
Zhi Lin Sun
Keyword(s):  
Rheological Properties ◽  
Dynamic Modulus ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Asphalt Binders ◽  
Test Results ◽  
Complex Shear Modulus ◽  
Complex Shear ◽  
Dynamic Modulus Test

Viscosity test, dynamic shear test, dynamic modulus test and creep test were conducted to investigate the rheological properties of high modulus asphalt and its mixture. Test results indicated that the viscosity of hard grade asphalt could be increased when compared with the ordinary asphalt, especially at high temperatures. The complex shear modulus and dynamic modulus of hard-grade asphalt binder and its mixture were increased, which implied that the stiffness of them was enhanced. Furthermore, the elastically portions for viscoelastic property of asphalt binders were increased, which resulted in the reduction of phase angle for hard grade asphalt binders and mixtures. The rutting parameter for hard-grade asphalt mixture was increased remarkably, which revealed that the resistance to permanent deformation could be significantly improved for hard grade asphalt mixture.

EVALUATION OF THE HIRSCH MODEL FOR DYNAMIC MODULUS ESTIMATION OF ASPHALT MIXTURES

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Hassan Malekzehtab ◽  
Hamid Nikraz
Keyword(s):  
Western Australia ◽  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Recycled Asphalt ◽  
Asphalt Mixture Performance Tester ◽  
Comparison Of The Results ◽  
Asphalt Concrete Pavement ◽  
Cylindrical Samples ◽  
Do So

The dynamic modulus of the asphalt mixtures is an important factor in designing or analyzing an asphalt concrete pavement, but it is expensive and time consuming to measure. Therefore, it is important to develop a model to predict this value. In this regard, the Hirsch model is a popular model, however, it is developed based on a range of U.S. asphalt mixtures and standards. Therefore, it is not certain that it can be used for asphalt mixtures based on materials and codes other than U.S. This article investigated whether this model performs satisfactorily with two typical asphalt mixtures in Western Australia (WA) containing 0, 10, 20, and 30% of recycled asphalt pavement. To do so, cylindrical samples were made with materials and locally established standards in Western Australia and then tested in Asphalt Mixture Performance Tester (AMPT) machine to acquire their dynamic modulus and phase angle values in different loading frequencies (0.01 to 10 Hz) and temperatures (4 to 40°C). Meanwhile, the results are estimated by the Hirsch model using some properties of the mixture and binder. The properties of the binder in different test conditions are obtained using a dynamic shear rheometer. The comparison of the results showed that the dynamic modulus underestimation or overestimation error can reach to 50 and 280% respectively. Generally, this model did not perform well in this study.

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.

Laboratory Study on Cold-Mixtures for Asphalt Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1361-1364
Author(s):  
Shi Bin Ma ◽  
Li Jie Wang ◽  
Guo Qiang Zhang
Keyword(s):  
Laboratory Study ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Recycled Asphalt ◽  
Concrete Mixtures ◽  
Mechanistic Analysis ◽  
Cleavage Strength

The main purpose of recycling is to reuse existing pavement material. First this paper reviews the necessary, feasibility and mechanistic analysis of recycled asphalt mixture, then summarizes the findings of a laboratory study to characterize and design recycled asphalt concrete mixtures using different tests. The laboratory tests carried out on the material were conventional test methods including unconfined compressive strength, cleavage strength, resilient modulus and shrinkage properties tests. The results of the laboratory can be taken as reference in design, engineering and further research．

Mechanistic and Volumetric Properties of Asphalt Mixtures with Recycled Asphalt Pavement

2005 ◽  
Vol 1929 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Jo Sias Daniel ◽  
Aaron Lachance
Keyword(s):  
Dynamic Modulus ◽  
Creep Compliance ◽  
Asphalt Pavement ◽  
Superposition Principle ◽  
Asphalt Mixtures ◽  
Volumetric Properties ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Creep Flow ◽  
Tension And Compression

This research examines how the addition of recycled asphalt pavement (RAP) changes the volumetric and mechanistic properties of asphalt mixtures. A Superpave® 19-mm mixture containing 0% RAP was the control for evaluating properties of mixes containing 15%, 25%, and 40% RAP. Two types of RAP were evaluated: a processed RAP and an unprocessed RAP (grindings). Testing included dynamic modulus in tension and compression, creep compliance in compression, and creep flow in compression. Dynamic modulus and creep compliance master curves were constructed with the use of the time–temperature superposition principle to describe the behavior of each mix over a range of temperatures. The voids in mineral aggregate (VMA) and voids filled with asphalt (VFA) of the RAP mixtures increased at the 25% and 40% levels, and there was also an influence of preheating time on the volumetric properties. The dynamic modulus of the processed RAP mixtures increased from the control to 15% RAP level, but the 25% and 40% RAP mixtures had dynamic modulus curves similar to that of the control mixture in both tension and compression. The creep compliance curves showed similar trends. A combination of gradation, asphalt content, and volumetric properties is likely the cause of these trends.

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.

scholarly journals DAMAGE CHARACTERISTICS OF RECYCLED ASPHALT MIXTURES UNDER THE EROSION EFFECT OF SNOW-MELTING SALT

10.6036/10174 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 379-387
Author(s):  
Baoyong Xue ◽  
Ping Yao ◽  
Xiaolong Zou ◽  
Qian Liu ◽  
Yanlong Zhao
Keyword(s):  
Asphalt Pavement ◽  
Water Immersion ◽  
Asphalt Mixture ◽  
Snow Melting ◽  
Freezing And Thawing ◽  
Recycled Asphalt ◽  
Damage Characteristics ◽  
Splitting Strength ◽  
Damage Degree ◽  
Erosion Effect

The erosion effect of snow-melting salt will degrade the durability of recycled asphalt pavement, but the damage characteristics of recycled asphalt mixture triggered by the erosion effect of snow-melting salt remain unclear. To solve the snow-melting salt-induced durability degradation of asphalt pavement, two commonly used snow-melting salts, NaCl and CaCl2, were selected to carry out the saline water immersion, salt-drying and -wetting cyclic and salt-freezing and -thawing cyclic splitting tests on recycled asphalt mixture, and the attenuation laws of splitting strengths and its damage characteristics under the erosion effect of snow-melting salts were analyzed. Results demonstrate that with the increase in soaking time, salt-drying and -wetting cycles and salt-freezing and -thawing cycles, the splitting strength of the recycled asphalt mixture maintain a declining trend, and the attenuation rate of splitting strength is elevated. The damage degree of the recycled asphalt mixture presents a nonlinear growth trend during saline water immersion, salt-drying and -wetting cycles, and salt-freezing and -thawing cycles. Under the same conditions, the damage degree after the action of NaCl solution is higher than that after the action of CaCl2 solution, and meanwhile, within the range of test concentration, the damage degree after the action of low-concentration saline solution is higher than that after the action of high-concentration saline solution. Conclusions provide a significant reference for the composition design and maintenance decisions of recycled asphalt pavement materials in cold regions. Keywords: road engineering; salt erosion; recycled asphalt mixture; damage characteristics; splitting strength

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