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Relevant bibliographies by topics / Initial tangent modulus and pavement

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Journal articles

Academic literature on the topic 'Initial tangent modulus and pavement'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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Journal articles on the topic "Initial tangent modulus and pavement"

1

Konrad, J. M. "The use of tangent stiffness to characterize the resilient response of unbound crushed aggregates." Canadian Geotechnical Journal 43, no. 11 (2006): 1117–30. http://dx.doi.org/10.1139/t06-079.

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Repeated-load triaxial tests were conducted on crushed granitic base-course material to study the resilient response under different stress paths and compaction states. It has been established that the resilient response of this prestrained unbound granular material is best defined in terms of tangent stiffness (Et) and vertical stress (σv). The data also revealed the existence of a threshold value of tangent stiffness that is essentially dependent on initial confining stress for a given compaction state. When the tangent modulus exceeds this threshold value, a unique relationship between tang

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2

Rahman, Md Mostaqur, Kazi Moinul Islam, and Sarah Gassman. "Estimation of Resilient Modulus for Coarse-Grained Subgrade Soils from Quick Shear Tests for Mechanistic-Empirical Pavement Designs." Designs 3, no. 4 (2019): 48. http://dx.doi.org/10.3390/designs3040048.

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The resilient modulus represents the subgrade soil stiffness, and it is considered one of the key material inputs in the Mechanistic Empirical Pavement Design Guide (MEPDG). The resilient modulus is typically estimated in the laboratory using a repeated load cyclic triaxial test, which is complex and time consuming to perform. Technical ability is also required to prepare the test specimens, particularly for coarse-grained soils. Therefore, there is a need to estimate the resilient modulus of coarse-grained soils from other simpler tests. In this study, correlations of resilient modulus with s

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3

Khegai, A. O., N. M. Kirilin, T. S. Khegai, and O. N. Khegai. "Experimental investigation of stress-strain properties of steel fiber reinforced concrete of the higher classes." Вестник гражданских инженеров 17, no. 6 (2020): 77–82. http://dx.doi.org/10.23968/1999-5571-2020-17-6-77-82.

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The tangent modulus of elasticity and deformation modulus are the most important characteristics of steel fiber reinforced concrete. The tangent modulus of elasticity corresponds to the initial loading stage, whereas in the operation stage and the fracture stage, there is a modulus of the material deformation, which is smaller, due to the formation of cracks in the element and non-linear behavior of the material. The paper presents experimental investigations of the tangent modulus of elasticity and the deformation modulus of fiber-reinforced concrete, class В60 at various percentages of fiber

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4

Wang, Min, and Xiao Hong Bai. "Experimental Research on Compression Characteristics of Compacted Loess." Applied Mechanics and Materials 275-277 (January 2013): 387–90. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.387.

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A series of compression tests were conducted on the samples taken from compacted soil site in Lulling, in order to investigate the compressibility of compacted loess in different water content and different compaction energy. Through statistics analysis of the testing data, the stress-strain curve of compacted loess could be expressed with Hyperbolic form. And the relation between initial tangent modulus and water content change coefficient was founded by introducing the water content change coefficient. The result shows that at the same compaction energy, the initial tangent modulus decreases

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5

Li, Longbiao. "Effect of Stochastic Loading on Tensile Damage and Fracture of Fiber-Reinforced Ceramic-Matrix Composites." Materials 13, no. 11 (2020): 2469. http://dx.doi.org/10.3390/ma13112469.

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In this paper, the effect of stochastic loading on tensile damage and fracture of fiber-reinforced ceramic-matrix composites (CMCs) is investigated. A micromechanical constitutive model is developed considering multiple damage mechanisms under tensile loading. The relationship between stochastic stress, tangent modulus, interface debonding and fiber broken is established. The effects of the fiber volume, interface shear stress, interface debonding energy, saturation matrix crack spacing and fiber strength on tensile stress–strain curve, tangent modulus, interface debonding fraction and fiber b

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6

Huang, Hua, Min Huang, and Jiangshu Ding. "Calculation of Tangent Modulus of Soils under Different Stress Paths." Mathematical Problems in Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/1916761.

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During excavation of foundation pit, soils of different sites may undergo different unloading paths. This study focuses on the tangent modulus of soil under different stress paths and provides theoretical basis for the deformation calculation of soil. In this paper, conventional triaxial compression test and K0 consolidation unloading test were conducted with mucky soil and silty clay to obtain the deformation characteristics of soils under different stress paths. Experiment results show that the soil samples exhibit distinct stress-strain characteristics under different stress paths, but they

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7

Fu, Jun, Yu Qin, and Qing Jun Ding. "Research on Influence of Longitudinal Gradient to Rigid Base Composite Road of Cross River (Sea) Tunnel under Large Longitudinal Slope." Advanced Materials Research 189-193 (February 2011): 1621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1621.

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The influences of longitudinal gradient on the large longitudinal slope rigid base composite road of cross river(sea) tunnel are concerned recently. Then the relationships between sheering stresses versus slope angle, load, pavement depth, interlayer touch condition and modulus are discussed separately by a three dimensional FEM model. Calculation and analysis showed: gradient had great influence on the surface tangent load and little influence on design deflection, the base and surface.The maximum tension and sheer on surface were increased with the gradient. On general, the gradient and surf

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8

Liu, Yufeng, Longbiao Li, Zhongwei Zhang, and Xiang Xiong. "Monotonic and Cyclic Loading/Unloading Tensile Behavior of 3D Needle-Punched C/SiC Ceramic-Matrix Composites." Materials 14, no. 1 (2020): 57. http://dx.doi.org/10.3390/ma14010057.

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In this paper, monotonic and cyclic loading/unloading tensile behavior of four different 3D needle-punched C/SiC composites are investigated. Under tensile loading, multiple micro parameters of tensile tangent modulus, tensile strength, and fracture strain are used to characterize tensile damage and fracture behavior. Under cyclic loading/unloading, multiple damage micro parameters of unloading residual strain, tensile peak strain, hysteresis loops width, hysteresis loops area, unloading and reloading inverse tangent modulus (ITM) are used to describe the tensile damage evolution. After tensil

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9

Konrad, J. M., та Ph D. Nguyen. "Implementation of the tangent modulus – vertical stress (Et–σv) model for flexible pavements analysis". Canadian Geotechnical Journal 43, № 11 (2006): 1131–43. http://dx.doi.org/10.1139/t06-060.

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A recently developed nonlinear elastic model of granular material, referred to as the tangent modulus – vertical stress (Et–σv) model, was implemented into a finite element numerical solver FlexPDE. The FlexPDE program was used to compare deflection predictions with actual plate-load test data from a site near Québec City. The proposed Et–σv model performed well and led to excellent predictions for load levels of 40, 50, and 70 kN. Comparison with predictions using the Uzan model suggests that constitutive models of granular materials are best expressed in terms of vertical stress rather than

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10

Li, Xiao Long, Xiao Nan Li, Yan Hui Zhong, and Fu Ming Wang. "Modulus Back Analysis of Pavement Structure Based on PSO." Applied Mechanics and Materials 178-181 (May 2012): 1222–25. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1222.

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A method for modulus back analysis of pavement structure based on particle swarm optimization (PSO) is presented. The principle and implementation process of the method is detailed. Some theoretical and experimental data of pavement deflection are selected to test its performance. The contrastive analysis of the modulus inversion results of the proposed method and some representative pavement modulus back calculation softwares using the same deflection data is also performed. The results show that the presented method has relatively high identification accuracy and notably computational stabil

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