scholarly journals Experimental Characterization of Viscoelastic Behaviors of Nano-TiO2/CaCO3 Modified Asphalt and Asphalt Mixture

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 106
Author(s):  
Chunli Wu ◽  
Liding Li ◽  
Wensheng Wang ◽  
Zhengwei Gu
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Viscoelastic Behavior ◽  
Good Prediction ◽  
Experimental Characterization ◽  
Bituminous Mixture ◽  
Nano Tio2 ◽  
Static Compression ◽  
Viscoelastic Behaviors

The purpose of this paper is to promote the application of nano-TiO2/CaCO3 in bituminous materials and present an experimental characterization of viscoelastic behaviors of bitumen and bituminous mixture modified by nano-TiO2/CaCO3. In this work, a series of viscoelastic behavior characterization tests were conducted, including dynamic shear rheometer (DSR) test for bitumen, uniaxial static compression creep test and dynamic modulus test for bituminous mixture. Moreover, various viscoelastic models with clear physical meanings were used to evaluate the influence of nano-TiO2/CaCO3 on the macroscopic performance of bitumen and bituminous mixture. The results show that bitumen and its mixtures are time-temperature dependent. The Christensen-Anderson-Marasteanu (CAM) model of frequency sweep based on DSR test indicated that adding nano-TiO2/CaCO3 can effectively capture the sensitivity of temperature. In addition, the incorporation of nano-TiO2/CaCO3 in bituminous mixture can significantly enhance the high-temperature anti-rutting, and slightly improve the low-temperature anti-cracking as well. At the same time, the modified Burgers model can accurately describe the viscoelastic behavior of bituminous mixtures in the first two creep stages, reflecting the consolidation effect of bituminous mixture. Also, the generalized Sigmoidal model can accurately grasp the characteristics of the relationship between dynamic modulus and reduced frequency and achieve good prediction effects in a wider frequency range.

Viscoelastic Characterization of Woven Dacron for Aortic Grafts by Using Direction-Dependent Quasi-Linear Viscoelasticity

2018 ◽  
Author(s):  
Eleonora Tubaldi ◽  
Giovanni Ferrari ◽  
Prabakaran Balasubramanian ◽  
Ivan Breslavskyi ◽  
Marco Amabili
Keyword(s):  
Dynamic Modulus ◽  
Static Loading ◽  
Linear Viscoelasticity ◽  
Loss Factor ◽  
Three Dimensional ◽  
Dynamic Modelling ◽  
Experimental Characterization ◽  
Infinite Time ◽  
Aortic Prosthesis

In case of direction-dependent viscoelasticity, a simplified formulation of the three-dimensional quasi-linear viscoelasticity has been obtained manipulating the original Fung equation. The experimental characterization of the static hyperelastic behaviour, the relaxation, the dynamic modulus and the loss factor of woven Dacron from a commercial aortic prosthesis has been performed. An 11 % difference of the reduced relaxation (after infinite time) between axial and circumferential directions has been observed for the woven Dacron. A very large increase in stiffness is obtained in case of harmonic loading with respect to the static loading. These findings are particularly relevant for dynamic modelling of currently used aortic grafts.

Characterization of Asphalt Binders Modified with Hydrated Lime and Limestone Dust

2011 ◽  
Vol 675-677 ◽  
pp. 469-472 ◽  
Author(s):  
Li Xing Ma ◽  
Zhi Da Li ◽  
Jun Feng Huang
Keyword(s):  
Softening Point ◽  
Dynamic Testing ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Viscoelastic Behavior ◽  
Hydrated Lime ◽  
Asphalt Binders ◽  
Limestone Dust ◽  
Temperature Susceptibility

The mixture of asphalt and filler called asphalt binder is an adhesive and packing material in asphalt mixture. In this paper, the influence of different filler sorts such as limestone dust and hydrated lime, and different rates of limestone dust and hydrated lime such as 2:1, 1:1 and 1:2 at the same mass ratio of filler/asphalt (1.0) on the asphalt binder’s properties has been studied. The paper gives a description of the most commonly used conventional tests, such as Penetration and Softening Point, and a more detailed description of the viscoelastic behavior and dynamic testing of bitumen by way of Brookfield viscometer and Dynamic Shear Rheometer (DSR). The contrasts among different test results were presented. It is found that there are a decrease in penetration and an increase in softening point with increasing hydrated lime content. The viscosity also increases obviously with the mass of hydrated lime increases. The DSR results show that hydrated lime can increase asphalt binders' anti-shear stress and G*/sinδ, and are helpful to its properties at high temperature. The four tests results were also incorporated to evaluate the temperature susceptibility and the rheological characteristics of asphalt binders.

Experimental Characterization of Strain and Damage Evolution in Carbon Nanotube-Polymer Nanocomposites

2014 ◽  
Author(s):  
Engin Cem Sengezer ◽  
Gary D. Seidel
Keyword(s):  
Polymer Nanocomposites ◽  
Compact Tension ◽  
Image Correlation ◽  
Experimental Characterization ◽  
Continuous Assessment ◽  
Damage State ◽  
Static Compression ◽  
Damage Initiation ◽  
Dimethyl Siloxane

An experimental characterization of nanocomposite strain and damage sensing in support of development of CNT-polymer nanocomposites for structural health monitoring (SHM) applications was conducted. As such, effort here is focused towards examining the piezoresistive behavior of poly(dimethyl-siloxane) (PDMS) and epoxy filled with acid treated single walled carbon nanotubes (COOH-SWNTs) under quasi-static compression and tension. Precision LCR Meter with two terminal method, in conjunction with mechanical testing and data acquisition system were used to measure instantaneous resistance values. Given the emphasis on SHM applications which correlate changes in electrical resistivity to deformation and damage, 0.1 wt% COOH-SWCNTs concentration below the nanocomposite electrical percolation threshold was considered for PDMS and epoxy. Measurements confirmed the onset of damage prior to noticeable effects in the stress-strain response. The resistance measurements were able to both detect strain for PDMS nanocomposites and damage initiation and provide continuous assessment of the damage state between damage initiation events for epoxy nanocomposites. Digital Image Correlation (DIC) System was used to observe the crack propagation on notched epoxy nanocomposite compact tension samples.

scholarly journals Laboratory Study on Properties of Tire Crumb Rubber Modified Bituminous Mixture

2012 ◽  
Vol 5 ◽  
pp. 219-223
Author(s):  
Yu Ming Dong ◽  
Yi Qiu Tan
Keyword(s):  
Dynamic Modulus ◽  
Performance Test ◽  
Resilient Modulus ◽  
Viscoelastic Behavior ◽  
Crumb Rubber ◽  
Bending Test ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Dynamic Modulus Test ◽  
Mechanical Performances

Abstract: This paper investigates the laboratory properties of tire crumb rubber modified (CRM) bitumen mixture. Two types of mixtures containing two binders (pen90 bitumen; CRM bitumen) were used to produce Marshall Sample and determine optimum content. Mechanical performances of bituminous mixtures were evaluated by Chinese wheel rutting test (WRT), 3point beam bending test (3P-BBT) at low temperature, indirect tensile Strength test (ITST) at freezing-thawing cycles. Superpave gyratory compactor (SGC) specimens also were prepared for modulus test. Resilient modulus (E) data were obtained by unconfined uni-axial compression test according to the specification of China. Dynamic modulus (E★) data were obtained by Simple Performance Test (SPT). Two temperatures were used at dynamic modulus test. The results indicate that CRM bituminous mixture performs better than referenced bituminous mixture on viscoelastic behavior, rutting resistance, cracking resistance and moisture stability.

Experimental Characterization of the Reliability of 3-Terminal Dual-Damascene Copper Interconnect Trees

2002 ◽  
Vol 716 ◽  
Author(s):  
C. L. Gan ◽  
C. V. Thompson ◽  
K. L. Pey ◽  
W. K. Choi ◽  
F. Wei ◽  
...  
Keyword(s):  
Stress Conditions ◽  
Experimental Characterization ◽  
Contact Lines ◽  
Tree Structures ◽  
Similar Test ◽  
Dual Damascene ◽  
Copper Interconnect ◽  
Test Conditions

AbstractElectromigration experiments have been carried out on simple Cu dual-damascene interconnect tree structures consisting of straight via-to-via (or contact-to-contact) lines with an extra via in the middle of the line. As with Al-based interconnects, the reliability of a segment in this tree strongly depends on the stress conditions of the connected segment. Beyond this, there are important differences in the results obtained under similar test conditions for Al-based and Cu-based interconnect trees. These differences are thought to be associated with variations in the architectural schemes of the two metallizations. The absence of a conducting electromigrationresistant overlayer in Cu technology, and the possibility of liner rupture at stressed vias lead to significant differences in tree reliabilities in Cu compared to Al.

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