Research on Creep Characteristics and Influencing Factors of Cement Asphalt Composite Binder

Li, Yimin; Yombah, Mulbah; Temitope, Ahmed Abdulakeem; Zou, Xiaolong; Yang, Fayong; Li, Wenbo; Jing, Hongjun

doi:10.1155/2020/6614920

Cited by 84 publications

(3 citation statements)

References 15 publications

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“…Many road researchers understand that an asphalt concrete creep is an important type of behavior under the influence of applied load, and they have carried out many studies in this direction [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Asphalt creep testing is included in the current American Guide for Road Pavement Design [34].…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that researchers mainly try to connect the asphalt concrete creep with its rut resistance [26][27][28]. Therefore, they began to test not only a conventional asphalt concrete but also asphalt concretes with various additives [28,29,31], even a composite asphalt concrete [30].…”

Section: Introductionmentioning

confidence: 99%

“…However, in the authors' opinion, their serious drawback is that the researchers pay attention mainly to the accuracy of the approximations during their use; they ignore the peculiarities of the characteristic stages of the deformation as a physical process. For example, the work [30] investigated creep of a composite asphalt concrete with unloading. Without paying the required attention to the differences in the deformation of the asphalt concrete at different stages, unloading was carried out at all three stages of deformation.…”

Section: Introductionmentioning

confidence: 99%

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Unsteady-State Creep of an Asphalt Concrete

Teltayev¹,

Iskakbayev

Rossi

et al. 2022

Applied Sciences

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This paper reports the experimental investigation of the unsteady-state creep process for road hot fine-grained asphalt concrete within the variation for a stress (from 0.0081 to 3 MPa) and a temperature (from +60 to −24 °C) at uniaxial tension. It is found out that unsteady-state creep for the asphalt concrete is approximated with a high accuracy at all the considered temperatures and stresses by the power function (with 3 parameters: ε0, α, δ) obtained from the Rabotnov’s fraction-exponential function; at temperatures from −12 to +12 °C the parameter α has the mean value of 0.5; unsteady-state creep duration for the asphalt concrete depends strongly on the stress and the temperature. It is satisfactorily described by the mathematical expression in the form of multiplication of the exponential and the power functions. Mathematical expressions have been obtained which describe the unsteady-state creep and the steady-state creep rates for the asphalt concrete. It was found that the strain rate is varied sharply in the initial time moments from t≈0 to 500–600s (theoretically from ∞ at t = 0 to ≈1–2×10−3%/s at t = 500–600 s); then it decreases monotonously in the following time moments, approximately according to a straight-line dependence. An asphalt concrete creep as a physical process can be similar to the viscous liquid flow: it is proposed to call the sites of the unsteady-state and the steady-state creeps as the sites of the transient and the constant viscosities respectively; a mechanical (rheological) model is represented which describes the sites of the transient and the constant viscosities for the creep curve of the asphalt concrete through Trouton and Newton viscosities respectively. Meanwhile, it has been stated that the viscosity of the asphalt concrete can reach 26,000 and 45,000 MPa at the temperatures of +24 and +36 °C respectively at the end of the unsteady-state creep.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unsteady-State Creep of an Asphalt Concrete

Teltayev¹,

Iskakbayev

Rossi

et al. 2022

Applied Sciences

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Smart system management and techno‐environmental optimal sizing of a desalination plant powered by renewables with energy storage

Affi

Cherif

2021

Int J Energy Res

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The present study assessed the performances of a brackish water reverse osmosis desalination unit powered by (PV/Wind/Battery) system with hydraulic storage. The hybrid renewable energy system and the reverse osmosis desalination plant were modeled for a specific site in southern Tunisia using real meteorological and water consumption data for 1 year. A total of 8760 simulations were treated under a dynamic simulator coupled to a smart energy management strategy to reach the hourly water load demand. Although the recognized reliability of the hybrid renewable sources compared to one-power source, their design may still critical. Therefore, in this paper, the authors suggest applying the methodology of optimizing the presented unit using an integrated systemic meta-modeling which is built through the design of experiments tool and defined by an equation involving the decision variables of the optimization as its parameters. This equation outlines the objects of the optimum sizing. The selected optimal design of the proposed unit is predicted by the genetic algorithm NSGA-II based on minimizing two objectives in conflict: Embodied energy and hydraulic loss of power supply. The CPU time of the NSGA-II optimization via the meta-model reached only 15 minutes of treatment (with one day to build the design of experiments) compared to the classic optimization via dynamic simulation. The results of the optimum sizing show that it is possible to consider a low water shortage rate (0% ⩽ LPSP-H < 5%) for a marginal variation of embodied energy rate which does not exceed (7%). K E Y W O R D S design of experiments, hybrid renewable energy, meta-model, multi-objective genetic algorithm, optimization, water desalination, water-energy nexus 1 | INTRODUCTION Climate change affects many sides of the environment and severely emphasizes the issue of water scarcity. Indeed, global warming attacks the planet's humidity and the water's underground basins, and if the water management strategies don't change on the behalf of "rescuing water sources", by 2050 the number of environmental refugees will be doubled five times than the actual number. Currently, the world population is about 7.6 billion, reaching 8.6 billion by 2030 and exceeding 9 billion in 2050 whom will be in increasing need of freshwater. 1,2 Desalting, as it was known during World War II while the freshwater supplies were restricted, is likely to be the

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A techno‐economic assessment and optimization of Dumat Al‐Jandal wind farm in Kingdom of Saudi Arabia

Marouani,

Fouad,

Mrad

2023

Energy Science & Engineering

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One major criterion in the selection of wind farm location is the cost of energy (COE). COE is the cost of producing 1 kWh electric energy on an annual basis. Mathematical model of COE includes site‐specific constants (such as reference height, mean wind speed, shape factors, wind shear coefficient, average temperature, and turbine altitude) and wind turbine parameters (such as maximum power coefficient, total loss of energy, cut‐in/cut‐off wind speed, rated wind speed, rated power, and the fix charge rate). In this work, we evaluate the COE of an onshore wind farm located at Dumat Al‐Jandal (Saudi Arabia) according to the hub height and rotor size. The 99 Vestas turbines can be mounted at a hub height ranging from 105 to 166 m with available rotor diameters of 105, 112, 117, 126, 136, 150, 155, or 163 m. Particle swarm optimization with a normal distribution is used to optimize the COE. Results show that COE is varying around the average value of $0.029335/kWh by ±$0.00021/kWh. The minimum COE was achieved with a rotor diameter of 150 m at hub height of 105 m. COE increases with the increase of hub height. At 105 m‐hub height, COE is almost the same, with a variation of 0.03% (It ranges between $0.029125/kWh and $0.029133/kWh). COE is more sensitive to rotor size than hub height. This investigation revealed that the COE estimation is in a range of 39%–48% greater than that announced COE by the developing project consortium.

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Research on Creep Characteristics and Influencing Factors of Cement Asphalt Composite Binder

Cited by 84 publications

References 15 publications

Unsteady-State Creep of an Asphalt Concrete

Unsteady-State Creep of an Asphalt Concrete

Smart system management and techno‐environmental optimal sizing of a desalination plant powered by renewables with energy storage

A techno‐economic assessment and optimization of Dumat Al‐Jandal wind farm in Kingdom of Saudi Arabia

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