scholarly journals Rheological Characterization of Asphalt Fine Aggregate Matrix Using Dynamic Shear Rheometer

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1273 ◽  
Author(s):  
Xiangbing Gong ◽  
Zejiao Dong ◽  
Haipeng Wang ◽  
Xianyong Ma ◽  
Huanan Yu ◽  
...  
Keyword(s):  
Void Content ◽  
Fine Aggregate ◽  
Dynamic Shear ◽  
Rheological Characterization ◽  
Dynamic Shear Rheometer ◽  
Predominant Component ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Fine Aggregate Matrix ◽  
Air Void

Asphalt fine aggregate matrix (FAM) is a predominant component directly related to field performances of hot asphalt mix (HMA), it is necessary to investigate material properties of FAM. Prior to preparing FAM specimens, the asphalt content was calculated by keeping the filler–bitumen (FB) ratio the same as in the corresponding HMA. A non-destructive fabrication method instead of coring and cutting methods was developed to compact FAM cylinders, and the joint base was designed to be concentric with the loading axis of testing system. Rheological responses of FAM were studied using the dynamic shear rheometer (DSR). Two repeated tests prove that the FAM compactor and the jointed base meet the requirement of data validation. Results show that rheological performances of FAM are significantly affected by asphalt content, gradation, air void content, and testing frequency. Air void is concluded to be the decisive factor which influences the stability of FAM, and the fiber is demonstrated to play a role on enhancing the flow resistance of FAM-F even though with the richest asphalt content.

Fatigue performance evaluation of recycled asphalt fine aggregate matrix based on dynamic shear rheometer test

2021 ◽  
Vol 300 ◽  
pp. 124025
Author(s):  
Zhuang Zhang ◽  
Sen Han ◽  
Hongchen Guo ◽  
Xiao Han ◽  
Chi Wu
Keyword(s):  
Performance Evaluation ◽  
Fatigue Performance ◽  
Fine Aggregate ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Recycled Asphalt ◽  
Fine Aggregate Matrix ◽  
Rheometer Test

Enhanced Model for Continuous Dielectric-Based Asphalt Compaction Evaluation

2018 ◽  
Vol 2672 (26) ◽  
pp. 144-154 ◽  
Author(s):  
Kyle Hoegh ◽  
Shongtao Dai ◽  
Trevor Steiner ◽  
Lev Khazanovich
Keyword(s):  
Dielectric Constants ◽  
Void Content ◽  
Calibration Data ◽  
Stable Model ◽  
Asphalt Overlay ◽  
Longitudinal Joint ◽  
Asphalt Mix ◽  
Pavement Construction ◽  
Air Void ◽  
Air Void Content

The compaction of asphalt concrete significantly affects long-term pavement performance. Although coring provides a relatively accurate way of assessing in-place density at specific locations, the coverage of the assessment is limited, especially at longitudinal joint locations. This can be particularly problematic because it is difficult to identify problematic locations that are likely to fail prematurely using current compaction assessment methods. Ground penetrating radar (GPR) provides an attractive nondestructive testing alternative for evaluation of compaction quality, especially with recent significant improvements in the GPR technology for this specific application. However, assessment of the air void content of the asphalt mix from the GPR-measured dielectric constant of the surface requires conversion of dielectric variation to air void content variation, which is the subject of this paper. An alternative to the commonly used model is proposed, leading to more justifiable predictions for low values of dielectric constants. The proposed model was used to interpret data from a 7-mi long asphalt overlay construction project. The results of the interpretation as compared with the results obtained with the conventional model show an improvement on the stability of the prediction at low air void contents, especially when core calibration data are limited and uncertainty is considered. These results are promising in the direction of reducing field cores necessary to have a stable model providing continuous compaction assessment of new asphalt pavement construction.

Prediction of dynamic shear modulus of fine aggregate matrix using discrete element method and modified Hirsch model

2019 ◽  
Vol 138 ◽  
pp. 103148 ◽  
Author(s):  
Yao Zhang ◽  
Tao Ma ◽  
Xue Luo ◽  
Xiaoming Huang ◽  
Robert L. Lytton
Keyword(s):  
Shear Modulus ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Dynamic Shear Modulus ◽  
Fine Aggregate ◽  
Dynamic Shear ◽  
Fine Aggregate Matrix ◽  
Element Method

Characterization of the air void content of fine aggregate matrices within asphalt concrete mixtures

2021 ◽  
Vol 300 ◽  
pp. 124214
Author(s):  
Alexis Jair Enríquez-León ◽  
Thiago Delgado de Souza ◽  
Francisco Thiago Sacramento Aragão ◽  
André Maués Brabo Pereira ◽  
Liebert Parreiras Nogueira
Keyword(s):  
Asphalt Concrete ◽  
Void Content ◽  
Fine Aggregate ◽  
Concrete Mixtures ◽  
Air Void ◽  
Air Void Content

Field Performance of Foaming Warm Mix Asphalt Pavement

2019 ◽  
Vol 2673 (3) ◽  
pp. 281-294 ◽  
Author(s):  
Shenghua Wu ◽  
Weiguang Zhang ◽  
Shihui Shen ◽  
Balasingam Muhunthan
Keyword(s):  
Field Performance ◽  
Warm Mix Asphalt ◽  
Void Content ◽  
Transverse Cracking ◽  
Water Based ◽  
Asphalt Content ◽  
Air Void ◽  
Air Void Content ◽  
Term Field

Water-containing and water-based foaming warm mix asphalt (WMA) technologies have been widely used in recent years but their long-term field performance is scarcely documented. This paper summarizes the field performances of six water-containing foaming and 10 water-based foaming WMA pavements across the United States and compares them with corresponding hot mix asphalt (HMA) pavements. Two series of field distress surveys were conducted to measure wheel-path longitudinal cracking, transverse cracking, and rut depth. Field cores were extracted to measure the in-place air void content, aggregate gradation, and asphalt content. The volumetric properties and field performance of foaming WMA and HMA control pavements were evaluated. The foaming WMA pavements showed slightly higher in-place air void (i.e., lower in-place density) than the HMA pavements. It was also found that the foaming WMA pavements in general had comparable or more wheel-path longitudinal cracking than the HMA pavements. The long-term field performance of foaming WMA pavements for transverse cracking and rutting were found to be similar to control HMA pavements. The study also reinforced the importance of in-place air void and asphalt content, finding that slightly higher asphalt content and lower in-place air void content may be beneficial for long-term resistance to cracking of asphalt pavements. As a result of the findings, the optimal pavement maintenance time was estimated to be four to five years since paving for full-depth pavement projects.

Long-Term Oven-Aging Effects on Fatigue and Initial Stiffness of Asphalt Concrete

1997 ◽  
Vol 1590 (1) ◽  
pp. 89-98 ◽  
Author(s):  
John Harvey ◽  
Bor-Wen Tsai
Keyword(s):  
Fatigue Life ◽  
Asphalt Concrete ◽  
Void Content ◽  
Aging Effects ◽  
Initial Stiffness ◽  
Asphalt Content ◽  
Flexural Beam ◽  
Air Void ◽  
Air Void Content

An investigation of the effects of long-term oven aging (LTOA) on initial stiffness and fatigue of asphalt concrete was made using two typical California asphalts, known to have different aging characteristics, in mixes with one aggregate. Asphalt content, air-voids content, and days of LTOA were varied independently. Stiffness and fatigue were evaluated using the controlled-strain flexural beam test developed by the Strategic Highway Research Program Project A-003A. The results indicated that both mixes exhibited an increase in initial stiffness with LTOA periods of up to six days. The sensitivity of beam fatigue life to LTOA depended on the asphalt. Beams containing Valley asphalt had virtually no change in fatigue life due to LTOA, whereas beams with Coastal asphalt showed some sensitivity to LTOA. For both asphalts, the average reduction in fatigue life from 6 days of LTOA was less than that caused by a 3 percent increase in air-void content or a 1 percent decrease in asphalt content. Simulations of thick and thin pavement structures were performed to reconcile the effects of LTOA, asphalt content, and air-void content on mix fatigue life and stiffness by evaluating their combined effects on predicted pavement fatigue life. The simulations indicated that aging, as induced by LTOA, increased fatigue life for all cases except one.

scholarly journals Brick Debris Dust as an Ecological Filler and Its Effect on the Durability of Asphalt Mix

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5023
Author(s):  
Agnieszka Woszuk ◽  
Michał Wróbel ◽  
Lidia Bandura ◽  
Wojciech Franus
Keyword(s):  
Asphalt Concrete ◽  
Negative Impact ◽  
Void Content ◽  
Bonding Layer ◽  
Recycling Process ◽  
Stiffness Modulus ◽  
Asphalt Mix ◽  
Resistance Decrease ◽  
Air Void ◽  
Brick Dust

Brick debris is one of the main construction wastes obtained from demolition of buildings. However, this material can be successfully used in the recycling process. The purpose of the study was to determine the brick dust addition effect on asphalt surface service life. An asphalt concrete reference mix was designed for bonding layer and prepared using a Marshall compacting device. In addition, three mixes with combined lime-brick filler were prepared as well as one mix containing only brick filler. The samples were tested for their volumetric properties—density, bulk density, air void content, resistance to water and frost and stiffness modulus with varying test temperatures. It was found that 25% of brick dust addition to the filler did not considerably change the properties of the tested samples, while in the case of 50% filler the replacement stiffness and frost resistance decrease; however, the minimum required value is maintained. It can be concluded that the lime filler can be replaced with up to 50% of brick dust without a negative impact on the properties of asphalt mix. The proposed solution fits into the idea of sustainable development indicating a way of brick debris management.

Evaluating fatigue performance of fine aggregate matrix of asphalt mix containing recycled asphalt shingles

2017 ◽  
Vol 139 ◽  
pp. 203-211 ◽  
Author(s):  
Jingwen Zhu ◽  
Mohammad Zia Alavi ◽  
John Harvey ◽  
Lijun Sun ◽  
Yuan He
Keyword(s):  
Fatigue Performance ◽  
Fine Aggregate ◽  
Recycled Asphalt ◽  
Recycled Asphalt Shingles ◽  
Asphalt Mix ◽  
Fine Aggregate Matrix ◽  
Asphalt Shingles

Determination of Volumetric Characteristics of FAM Mixtures using X-Ray Micro-Computed Tomography and Their Effects on the Rheological Behavior of the Material

2020 ◽  
Vol 2674 (5) ◽  
pp. 97-107
Author(s):  
Patrícia Hennig Osmari ◽  
Rogério Ferreira da Costa ◽  
Francisco Thiago Sacramento Aragão ◽  
Delson Braz ◽  
Regina Cély Rodrigues Barroso ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Ct Scan ◽  
Mechanical Tests ◽  
Asphalt Mixtures ◽  
Dynamic Shear Modulus ◽  
Fine Aggregate ◽  
Dynamic Shear ◽  
Micro Computed Tomography ◽  
Volumetric Characteristics ◽  
Air Void

Fine aggregate matrix (FAM) has been regarded as a key constituent of asphalt mixtures. Although several design methods have been recently proposed to prepare FAM specimens that represent the materials contained within the asphalt concretes, the volumetric characteristics of FAM may not be uniformly distributed within samples compacted using devices such as the Superpave gyratory compactor (SGC). This can mislead the mechanical analyses conducted with testing specimens that are typically extracted from different locations of the compacted samples, as they can present varying volumetric characteristics. This study employs the advanced micro-computed tomography (CT) scan technique to evaluate the air void distribution within FAM specimens extracted from different locations of SGC samples compacted with distinct air void contents. Rheological tests are performed in a dynamic shear rheometer to determine the dynamic shear modulus of the testing specimens. A statistical analysis is conducted to evaluate potential correlations between the volumetric and the rheological characteristics of the FAMs and to identify locations within the SGC samples from which small cylindrical specimens with similar characteristics can be extracted and used for testing. The adoption of advanced techniques such as the CT scan is essential for the advancement of the knowledge on the complex characteristics of asphalt mixtures, and may facilitate the fabrication of FAMs that are more representative of those that comprise asphalt concretes, as well as allow the use of similar replicates in mechanical tests.

Determination of Binder Glass Transition and Crossover Temperatures using 4-mm Plates on a Dynamic Shear Rheometer

2019 ◽  
Vol 2673 (10) ◽  
pp. 247-260 ◽  
Author(s):  
Michael D. Elwardany ◽  
Jean-Pascal Planche ◽  
Jeramie J. Adams
Keyword(s):  
Glass Transition ◽  
Asphalt Binder ◽  
Terminal Region ◽  
Reference Frequency ◽  
Intermediate Region ◽  
Parallel Plates ◽  
Dynamic Shear ◽  
Rheological Characterization ◽  
Dynamic Shear Rheometer ◽  
Modulated Differential Scanning Calorimetry

The accurate rheological characterization of asphalt binder properties, as a function of pavement service life, is crucial to improving asphalt binder specifications, modifications, and formulation methods. Bitumen streams from refineries have experienced significant changes since the development of SHRP Superpave specifications as a result of economic, technical, and environmental reasons. Binder rheological behavior is divided into three regions: near glassy region, terminal region, and an intermediate “transition” region between them. At a reference frequency, these regions are separated by two characteristic temperatures: (1) the glass transition temperature (Tg), which is the temperature between the near glassy region and the intermediate region, and (2) the crossover temperature (TG’=G”), which is the temperature between the intermediate region and the terminal region. In this study, Tg and TG’=G” of 50 binders were obtained from a dynamic shear rheometer (DSR) using 4-mm parallel plates. Glass transition temperatures from DSR were compared with those obtained from modulated differential scanning calorimetry (DSC). Tg and TG’=G” were also compared with continuous low-PG temperatures and ΔTc parameter. Results indicate that critical temperatures based on the creep stiffness and the relaxation rate can be determined from Tg and TG’=G”, respectively. Furthermore, ΔTc parameter correlates well with the intermediate region temperature range (TIR).

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