Stabilization Mechanisms in Polyolefin-Asphalt Emulsions

2009 ◽  
pp. 1-1-19 ◽  
Author(s):  
SA Hesp ◽  
RT Woodhams
Keyword(s):  
Asphalt Emulsions

scholarly journals Research on the Performance of Regenerant Modified Cold Recycled Mixture with Asphalt Emulsions

2021 ◽  
Vol 13 (13) ◽  
pp. 7284
Author(s):  
Decai Wang ◽  
Tengteng Guo ◽  
Haolei Chang ◽  
Xianhua Yao ◽  
Yuanzhao Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Dynamic Modulus ◽  
Dynamic Mechanical Properties ◽  
Moisture Susceptibility ◽  
Splitting Strength ◽  
Temperature Performance ◽  
Strength Tests ◽  
Asphalt Emulsions ◽  
Coefficient Method

In order to study the mechanical properties and effect of a regenerant on a cold recycled mixture with asphalt emulsions (CRMEs), the moisture susceptibility, high-temperature performance, low-temperature performance, dynamic mechanical properties and durability of CRMEs were analyzed and evaluated by immersion splitting strength tests, freeze-thaw splitting strength tests, rutting tests, semi-circle bending tests, uniaxial compression dynamic modulus tests and indirect tensile tests. Scanning electron microscopy (SEM) was used to analyze the micromorphology of CRMEs modified with regenerant. Finally, a comprehensive evaluation system of five different CRMEs was established based on the efficacy coefficient method to quantitatively analyze the comprehensive performance of the CRMEs. The test results showed that the regenerant can significantly improve the water immersion splitting strength, freeze-thaw splitting strength fracture energy density, and fatigue resistance of CRMEs. However, the addition of regenerant affected the high-temperature performance of the cold recycled mixture. The dynamic modulus of the CRMEs first increased and then decreased with regenerant content increasing. When the regenerant content was 8%, the dynamic modulus of the CRMEs was the highest. Adding styrene-butadiene rubber (SBR) latex can improve the high-temperature performance of CRMEs, but the moisture susceptibility, low temperature performance and fatigue resistance of the cold recycled mixture were not significantly improved, and the dynamic modulus of the mixture was reduced. Based on the efficacy coefficient method, the optimal content of regenerant is 8%. Regenerant are potential modifiers for cold recycled mixture that they can significantly improve the dynamic mechanical properties and durability.

scholarly journals Evaluation of Bleeding Resistance in Chip Seal and Asphalt Emulsion Residue Rheology

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 670
Author(s):  
Preeda Chaturabong
Keyword(s):  
Influence Factors ◽  
Application Rate ◽  
Test Methods ◽  
Test Results ◽  
Asphalt Emulsion ◽  
Aggregate Gradation ◽  
Factors Affecting ◽  
Promising Tool ◽  
Chip Seal ◽  
Asphalt Emulsions

Chip seal bleeding is influenced by many factors, including design inputs, material properties, and project-specific conditions. It reduces the surface texture of the pavement and thus compromises the safety of the traveling public. Even though factors that bring about premature bleeding are known, currently, no laboratory test methods for evaluating bleeding in chip seals have been specified. The objective of this paper is to present the results of an investigation of the influence factors of asphalt emulsion residue properties measured by the ASTM D7405 multiple stress creep and recovery (MSCR) test, as well as other factors related to chip seal bleeding resistance as measured by the modified loaded wheel test (MLWT). In this study, the MSCR test was used as a tool for evaluating the performance of asphalt emulsions because it has been identified as a potential test related to bleeding in the field. In addition, MLWT was selected as a tool for evaluating chip seal bleeding performance in the laboratory. The results of the MLWT showed that the emulsion application rate (EAR), aggregate gradation, and emulsion properties were significant factors affecting bleeding. The MSCR test was found to be a promising tool for the performance evaluation of asphalt emulsion residue, as the test was able to differentiate between emulsion chemistries and modifications in terms of sensitivity to both temperature and stress. In relation to chip seal bleeding resistance, only the creep compliance (Jnr) obtained from the MSCR test results was identified as a significant property affecting potential for bleeding.

scholarly journals DEVELOPMENT OF ASPHALT EMULSIONS INCORPORATING WASTE LUBRICATING OIL

2016 ◽  
Vol 9 (4) ◽  
pp. 167-176 ◽  
Author(s):  
P. K. S. Brito ◽  
D. F. Carvalho ◽  
M. C. P. A. Moura ◽  
E. L. Barros Neto ◽  
T. N. C. Dantas ◽  
...  
Keyword(s):  
Lubricating Oil ◽  
Asphalt Emulsions

Paving with asphalt emulsions

2015 ◽  
pp. 393-426 ◽  
Author(s):  
K. Takamura ◽  
A. James
Keyword(s):  
Asphalt Emulsions

The Influence of Time after Crushing for Cold In-Place Recycling on Compaction and Raveling

2019 ◽  
Vol 2673 (3) ◽  
pp. 419-426 ◽  
Author(s):  
Erica Yeung ◽  
Andrew Braham
Keyword(s):  
Asphalt Pavement ◽  
Milling Process ◽  
Reclaimed Asphalt Pavement ◽  
Asphalt Emulsion ◽  
Stabilizing Agent ◽  
Reclaimed Asphalt ◽  
Limestone Aggregate ◽  
Asphalt Emulsions ◽  
Test Aggregate

Cold in-place recycling (CIR) mills existing bound pavement with a stabilizing agent to remove all surface distresses and some structural distresses. This research investigated the influence of extending the time after crushing, aggregate type, and asphalt emulsion type on four CIR compaction metrics and on the raveling test. Aggregate was crushed in the lab to mimic the milling process of CIR and was mixed with laboratory produced asphalt emulsion at various times after crushing. Three types of aggregate were used, including one field reclaimed asphalt pavement (RAP), a limestone-based laboratory-produced RAP, and a syenite-based laboratory-produced RAP. Two types of cationic medium set (CMS) asphalt emulsions were also used: a proprietary and a commodity asphalt emulsion. One of the compaction metrics, the number of gyrations to 76% Density ( N76), was found to have the most promise for capturing the charge on the RAP, as the limestone aggregate and proprietary asphalt emulsion saw the highest resistance to compaction. These two materials were the most reactive so it was reasonable that they caused the fastest break of the asphalt emulsion. The raveling test did not produce similarly conclusive results. Whereas some trends from the raveling test showed the ability to capture charge on the RAP, perhaps the four-hour cure before the raveling test may have masked any influence of time after crushing and asphalt emulsion type.

scholarly journals Rheological and Molecular Characterization of Rubberized Asphalt Emulsion

2019 ◽  
Vol 271 ◽  
pp. 03001
Author(s):  
Nafiur Rahman ◽  
Tanvir Sarkar ◽  
Mostafa Elseifi
Keyword(s):  
Molecular Characterization ◽  
Gel Permeation Chromatography ◽  
Crumb Rubber ◽  
Infrared Analysis ◽  
Asphalt Emulsion ◽  
Asphalt Rubber ◽  
Physical Testing ◽  
Asphalt Emulsions ◽  
Aged Binder

An experimental study was conducted to evaluate the rheological and molecular characterization of rubberized asphalt emulsion. One rubberized asphalt emulsion and an asphalt rubber (CRS-2TR and AC20-TR) and two conventional emulsions (CRS-2 and CRS-2P) were evaluated. The emulsions were characterized by conducting rheological and physical testing. The influence of adding crumb rubber on the binder chemical composition was investigated in the laboratory using Fourier Transform Infrared Analysis (FTIR) on the original, Rolling-Thin Film Oven (RTFO) and Pressure Aging Vessel (PAV)-aged binder residues. Results showed that CRS-2TR and AC20-TR had lower carbonyl and sulfoxide indices indicating better resistance to aging compared to conventional asphalt emulsions. Results of High-Pressure Gel Permeation Chromatography (HP-GPC) on the original, RTFO and PAV-aged binder residues showed that CRS-2TR and AC20-TR had similar High-Molecular Weight (HMW) content compared to that of conventional asphalt emulsions indicating similar susceptibility to brittleness with age.

scholarly journals Structural Contribution of Cold In-Place Recycling Base Layer

CivilEng ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 736-746
Author(s):  
Mateo E. Carvajal ◽  
Murugaiyah Piratheepan ◽  
Peter E. Sebaaly ◽  
Elie Y. Hajj ◽  
Adam J. Hand
Keyword(s):  
Performance Test ◽  
Fatigue Testing ◽  
Base Layer ◽  
Analysis Model ◽  
Performance Models ◽  
Mechanistic Analysis ◽  
Structural Contribution ◽  
Pavement Structures ◽  
Asphalt Emulsions ◽  
Flexural Beam

Cold in-place recycling (CIR) of asphalt pavements is a process that has successfully been used for many years. The use of CIR for rehabilitation offers many advantages over traditional overlays due to its excellent resistance to reflective cracking and its environmentally friendly impacts. Despite the good performance and positive sustainability aspects of CIR, the structural contribution of the CIR base layer has not been well defined. In this research, CIR mixtures were designed with different asphalt emulsions. The mixtures were then subjected to dynamic modulus, repeated load triaxial, and flexural beam fatigue testing over a range of temperature and loading conditions. The performance test data generated were then used to develop CIR rutting and fatigue performance models used in the mechanistic analysis of flexible pavements. The technique used to develop the performance models leveraged the fact that the rutting and fatigue models for individual CIR mixtures were all within the 95 percent confidence interval of each other. A mechanistic analysis was conducted using the 3D-Move Mechanistic Analysis model. With the laboratory-developed performance models, the structural layer coefficient for the CIR base layer were developed for use in the 1993 AASHTO Guide for the Design of Pavement Structures. This analysis led to the determination of an average structural coefficient of the CIR base layer of 0.25.

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