Evaluation of the Master Curves for Complex Shear Modulus for Nano-Modified Asphalt Binders

CICTP 2012 ◽  
2012 ◽  
Author(s):  
Hui Yao ◽  
Zhanping You ◽  
Liang Li ◽  
Shu Wei Goh ◽  
Chris Dedene
Keyword(s):  
Shear Modulus ◽  
Asphalt Binders ◽  
Master Curves ◽  
Complex Shear Modulus ◽  
Modified Asphalt ◽  
Complex Shear

EFFECT OF VISCOELASTIC BEHAVIOR OF CELLULOSE OIL PALM FIBER (COPF) MODIFIED 60-70 ASPHALT BINDER FOR DETERIORATION FOR ROADS AND HIGHWAYS

2015 ◽  
Vol 75 (11) ◽  
Author(s):  
Md. Maniruzzaman A. Aziz ◽  
Ahmed Wsoo Hamad ◽  
Abdulmalik Musa Maleka ◽  
Fauzan Mohd Jakarni
Keyword(s):  
Shear Modulus ◽  
Oil Palm ◽  
Softening Point ◽  
Asphalt Binder ◽  
Viscoelastic Behavior ◽  
Complex Shear Modulus ◽  
Palm Fiber ◽  
Modified Asphalt ◽  
Complex Shear ◽  
Modified Asphalt Binder

This paper dealt with the viscoelastic behavior of Cellulose Oil Palm Fiber (COPF) modified 60-70 penetration grade asphalt binder for the deterioration of roads. The main objective of this study was to investigate the effect of various COPF contents on the physical and the rheological properties of penetration grade 60-70 asphalt binder. Laboratory tests performed comprised of viscosity, penetration, softening point, short & long term ageing, as well as complex shear modulus (G*).  The COPF was blended in 0.2, 0.4, 0.6, 0.8, and 1.0% by weight of asphalt binder, including 0% as control. The COPF modified asphalt binder showed an increasing viscosity and softening point with the increase of COPF content, whereas the penetration decreased as the COPF was increased for the binder. The complex shear modulus (G*), rutting factor (G*/sin δ), and fatigue factor (G*sin δ) showed significant improvement for the modified samples compared to the unmodified samples. The results indicated that the COPF modified asphalt binder had high potential to resist permanent (rutting) deformation and fatigue cracking than the unmodified sample. 

Viscoelastic Analysis of Asphalt Mastic Based on Micromechanics

2011 ◽  
Vol 266 ◽  
pp. 38-41
Author(s):  
Jiu Peng Zhang ◽  
Li Xu ◽  
Jian Zhong Pei
Keyword(s):  
Shear Modulus ◽  
Chemical Interaction ◽  
Hydrated Lime ◽  
Asphalt Binders ◽  
Dynamic Shear Modulus ◽  
Dynamic Shear ◽  
Complex Shear Modulus ◽  
Asphalt Mastic ◽  
Physico Chemical ◽  
Complex Shear

In this study, the stiffening effect of fillers on asphalt binders was characterized through micromechanics and rheology methods. The dynamic shear rheometer (DSR) was used to measure viscoelastic properties of asphalt mastic. Mechanical volume filling effects and additional interacting mechanisms within mastic systems are discussed on the basis of micromechanics-rheology model to predict the complex shear modulus of asphalt mastic from the measured mastic data. It is observed that the phase angle ranges from 88.8o to 89.0o, does not significantly change due to limestone fillers addition. The analytical model prediction of complex shear modulus based on the dynamic shear modulus can be used. Using the nonlinear regression, the Einstein coefficient KE is 4.22, 5.09 and 7.44 for asphalt mixed with limestone, cement and hydrated lime, respectively. Beside, the SEM results explain why the mastic system with hydrated lime shows the highest KE. The behavior of hydrated lime fillers filled mastics is probably due to physico–chemical interaction, which can be validated by further research.

The Effects of Aging on Asphalt Binders Containing Visbreaking Residues

2017 ◽  
Vol 737 ◽  
pp. 541-546
Author(s):  
Pavel Coufalik ◽  
Ondrej Dasek ◽  
Iva Krcmova ◽  
Petr Hyzl
Keyword(s):  
Low Temperature ◽  
Shear Modulus ◽  
Softening Point ◽  
Laboratory Tests ◽  
Asphalt Binders ◽  
Complex Shear Modulus ◽  
Needle Penetration ◽  
Complex Shear ◽  
Creep Stiffness ◽  
Effects Of Aging

The quality and properties of asphalt binders are one of the most important factors that affect lifetime of asphalt roads. In refineries, visbreaking residues (VFCRs) are sometimes added to asphalt binders in variable ratios. VFCR addition can affect the overall properties of the manufactured binder, in particular resistance against aging. Using selected laboratory tests, this paper analyzes the effects of adding VFCRs to paving bitumens with a gradation of 160/220 on its properties (needle penetration, softening point, complex shear modulus and phase angle and creep stiffness and m-values). Also the effect of simulated aging of binders containing VFCRs on their properties has been tested. It was found that by increasing the VFCR content and the extent of aging, the binder stiffness increases. At higher VFCR ratios, the binder is more affected by aging at higher temperatures. Increased amount of VFCR also negatively affects low-temperature properties of the binder, which is related to its higher stiffness.

scholarly journals Study on aging of lignin modified asphalt under thermogravimetric conditions

2021 ◽  
Vol 233 ◽  
pp. 01104
Author(s):  
Xin Fu ◽  
Mao He ◽  
Yuancai Liu
Keyword(s):  
Shear Modulus ◽  
Performance Test ◽  
Chemical Properties ◽  
Aging Effect ◽  
Complex Shear Modulus ◽  
Continuous Increase ◽  
Modified Asphalt ◽  
Complex Shear ◽  
And Performance ◽  
Different Content

In order to study the aging process of lignin-modified asphalt and explore the effect of lignin on the anti-aging performance of base asphalt, 4 sets of lignin-modified asphalt were prepared under different base asphalt, different dosage, temperature and time. Based on the thermal oxidation test (TFOT), dynamic shear rheological test (DSR), thermogravimetric test (TG), and infrared spectroscopy micro-performance test (FTIR), the high-temperature rheological properties and performance of aging lignin-based asphalt with different content were investigated. The changing law of the chemical properties of functional groups. The results show that the addition of lignin to the base asphalt sample increases the complex shear modulus G* and decreases the phase angle δ compared to the base asphalt sample prepared by the same sample preparation process. In the same sample, with the continuous increase of the test temperature, the complex shear modulus G* of the matrix asphalt before or after aging and the modified asphalt with different content of lignin showed a downward trend. The modification mechanism of lignin on asphalt is essentially that lignin decomposes and reacts with oxygen in the process of thermal oxidative aging, which delays the oxidation reaction of asphalt during aging, so as to achieve the anti-aging effect of asphalt.

scholarly journals Bone Glue Modified Asphalt: A Step towards Energy Conservation and Environment Friendly Modified Asphalts

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Hashim Raza Rizvi ◽  
Mohammad Jamal Khattak ◽  
August A. Gallo
Keyword(s):  
Developing Countries ◽  
Shear Modulus ◽  
Research Study ◽  
Polymer Modification ◽  
Complex Shear Modulus ◽  
Environment Friendly ◽  
Modified Asphalt ◽  
The Past ◽  
Complex Shear ◽  
Bone Glue

Asphalt has been modified for the past several decades using various additives, including synthetic polymers. Polymer modification improves structural and engineering characteristics of the binder, which is a result of improvement in rheological characteristics of binder as well as its adhesion capability with the aggregate. Such enhancement inevitably enhances the performance characteristics of hot mix asphalts (HMA) such as fatigue life, resistance to rutting, and thermal cracking. Even though polymer-modified HMA is popular in North America and European countries, its use is still limited in developing countries of Southeast Asia due to high costs associated with its manufacturing, processing, and energy consumption. In this study, a new kind of asphalt modifier derived from animal wastes, such as bones, hides, and flesh commonly known as Bone Glue, is studied. This biomaterial which is a by-product of food and cattle industries is cheap, conveniently available, and produced locally in developing countries. The results of the research study showed that the bone glue can easily be mixed with asphalt without significantly altering the asphalt binder’s viscosity and mixing and compaction temperatures of HMA. Additionally, improvements in complex shear modulus for a range of temperatures were also determined and it was found that complex shear modulus was improved by bone glue modification.

Measurement of G* in Fine Asphalt Mixes

2015 ◽  
Vol 2507 (1) ◽  
pp. 39-49
Author(s):  
Fabiola Miranda-Argüello ◽  
Luis Loria-Salazar ◽  
José P. Aguiar-Moya ◽  
Paulina Leiva-Padilla
Keyword(s):  
Shear Modulus ◽  
Shear Loading ◽  
Asphalt Mixtures ◽  
Styrene Butadiene Rubber ◽  
Specimen Preparation ◽  
Butadiene Rubber ◽  
Master Curves ◽  
Complex Shear Modulus ◽  
Test Configuration ◽  
Complex Shear

This study characterized the mechanical properties in fine asphalt mixtures by means of a microscale test. The method involved the design of the fine asphalt matrix, the specimen preparation, the performance of shear tests, and the construction of complex shear modulus master curves based on the obtained results. The tests were performed with a device called a dynamic mechanical analyzer (DMA). The test configuration consisted of a temperature and frequency sweep for a given strain level, within the linear viscoelastic range of the material. The test implementation experimental design involved the use of two aggregate sources and three asphalt types (neat, styrene–butadiene rubber modified, and ethylene copolymer modified). On the basis of the results for the mixes, master curves were calibrated by sigmoidal, Christensen–Anderson, and Christensen–Anderson–Marasteanu general models and using Arrhenius and William–Landel–Ferry shift factors. As part of the study, the DMA test based on shear loading mode was successfully implemented and allowed for measurement of a fundamental material property: complex shear modulus ( G*). The G* estimation involved measurement of shear stress, strain, and phase angles. Complex shear moduli in the range of 40 to 170 MPa were obtained; the fine asphalt mixtures modified with ethylene block copolymer developed higher stiffness, and the ones with neat binder had lower stiffness. From the G* results, master curves were developed. A higher fit was obtained when the general sigmoidal formula was used; this result indicated the high degree of similitude in behavior between the fine asphalt matrix and the complete hot-mix asphalt mixtures.

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