1,028 research outputs found
A few derivations related to convolution and inter-conversion for linear visco-elastic materials
No full textThis article presents a heuristic derivation of the convolution integral, which is a critical concept in solving mechanistic problems related to linear viscoelastic materials. This article also presents the derivations for inter-conversions from time to frequency dependent responses. In the context of this article, viscoelastic response is considered to be synonymous with time-dependent response. This article is presented only as a reference, if you notice any corrections or have any suggestions, please email them to: [email protected]
Halting the Aging Clock in Asphalt Binders: Past, Present, and Future
No full textThis presentation takes a look at the historical arc of investigations into oxidative aging in asphalt binders as well as the present and future directions to develop oxidation resistant asphalt binders
Videos and Image Data Combining Mechanical Properties and Damage Evolution in Different Asphalt Binders
No full textImages of damage captured in real-time in asphalt binders tested using poker chip geometry in load and displacement control modes were used to create a video to visualize crack nucleation and growth. Six different performance grade asphalt binders were tested at RTFO and PAV aging conditions, two unmodified and four modified. The modified asphalt binders included different modifier types and contents
Test method for separation of bitumen into four fractions using pre-packaged cartridges
No full textThis is a detailed step-by-step procedure to conduct Si-SARA fractionation of asphalt binder
Reading: Amit Majmudar
No full textBecause of COVID-19 this event is canceled.
Amit Majmudar, a multi-genre author and translator, offers a Sacred Arts Festival reading that explores the concept of Building Bridges.
Co-sponsored by the Department of English and the Sacred Arts Festival
Parts and Sample Preparation Guide for the Poker Chip or Asphalt Ductility Test
No full textThis document contains the parts, engineering drawings, and sample preparation method to conduct the poker chip or asphalt ductility test
Exploring young students creativity: The effect of model eliciting activities
No full textThe aim of this paper is to show how engaging students in real-life mathematical situations can stimulate their mathematical creative thinking. We analyzed the mathematical modeling of two girls, aged 10 and 13 years, as they worked on an authentic task involving the selection of a track team. The girls displayed several modeling cycles that revealed their thinking processes, as well as cognitive and affective features that may serve as the foundation for a methodology that uses model-eliciting activities to promote the mathematical creative process
A parameter back-calculation technique for pavements under moving loads
No full textMaintenance and rehabilitation strategies of pavements are usually made based on the results of performance evaluation. An efficient tool for pavement structural evaluation at network level is the traffic speed deflectometer (TSD) test. In order to deal with TSD measurements, this paper proposes a parameter back-calculation technique. Firstly, the sensitivity of the surface response for an elastic pavement structure with hysteretic damping to different structural parameters is investigated. Then, the ability of the parameter backcalculation technique is verified by conducting a case study. The results show that the proposed technique is able to back-calculate the structural parameters of pavements by analysing TSD measurements. The presented work contributes to the development of parameter back-calculation techniques for the TSD test.Accepted author manuscriptPavement EngineeringDynamics of Structure
Determining the Effect of Damping Layers in Flexible Pavements on Traffic Induced Vibrations
No full textThis paper proposes a novel method to evaluating the effect of damping layers on traffic induced vibrations; it’s based on the estimation of the Rayleigh damping coefficients of different layers to be implemented in a FEM of the pavement structure. Two commonly used methods to determining those parameters are compared and then an improved approach is introduced by considering natural frequencies of the pavement structure but without underestimating damping in the basic frequency range. In addition, a more reasonable method is proposed to calculating pavement structure vibration based on shear beam model. Finally, the results of in-situ FWD tests are used to validate the accuracy of the model; the comparison between simulation and FWD results demonstrates the accuracy of the proposed method that is acceptable
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