Permanent Deformation Prediction Model of Unbound Granular Materials for Flexible Pavement Design

Alnedawi, Ali; Nepal, Kali Prasad; Al-Ameri, Riyadh

doi:10.1007/s40515-018-00068-1

Cited by 17 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, researchers have conducted a lot of research on the effects of different molding methods on the performance of the graded crushed stone [19][20][21][22], the indexes' development for the graded crushed stone [23], and different material designs [24,25]. Meanwhile, the performance characterization and the evolution under various conditions (such as the layer thickness, the degree of compaction, and so on) are analyzed [5,26,27] to improve the performance of the graded crushed stone mixture.…”

Section: Introductionmentioning

confidence: 99%

Research on Design Indicators for Graded Crushed Stone Mixture Based on Vibration Molding Method

Chen¹,

Yan

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The asphalt pavement easily shows the diseases like cracking, rutting, and structural water damage during the early service life in Fujian province for the complex effects of very high temperature, easily rainy climatic condition, and high-frequency heavy loading. However, the corresponding studies and strategies are still rare. Herein, in order to study the relationship of compaction methods on the stress-strain characteristics and shear strength of graded crushed stone mixtures, 11 kinds of typical graded crushed stone mixtures, which were taken from the five different expressways under construction in Fujian Province, were molded by both the modified vibration compaction and modified Proctor compaction. The results indicate that the modified vibration molding method matches much better with the compaction of practical projects and can be used to evaluate the performance of graded crushed stone mixtures. Further, the performance indexes got by the modified vibration compaction and the modified Proctor compaction have strong correlations. Therefore, based on the modified vibration compaction, the guidelines for standardized mix design of graded crushed stone mixture in Fujian province are proposed: the resilient modulus of 300 MPa and the deformation rate of 10–8 in the dynamic triaxial test are used as the performance indicators of the bearing capacity and the antideformation ability; the shear strength of 400 kPa in the static triaxial test is used as the performance indicators of the shear failure resistance. Besides, most limestone mixtures perform well and have the advantages of good resistance to permanent deformation and shear resistance.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on Design Indicators for Graded Crushed Stone Mixture Based on Vibration Molding Method

Chen¹,

Yan

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…These gradations were compacted at OMC (% of the total mc = Ww/Wd, where mc is the moisture content, Ww is the weight of water, and Wd is the dry weight of solids/gradation), (OMC + 1%), (OMC − 1%), (OMC − 2%) and oven-dry condition to investigate the resilient modulus at different moisture and gradation levels. Repeated load triaxial tests (RLTTs) [48] were conducted to determine the resilient modulus of these aggregates gradations. Table 3 shows the moisture contents of selected gradations of the samples for RLTT.…”

Section: Materials and Samplesmentioning

confidence: 99%

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

et al. 2022

View full text Add to dashboard Cite

In this study, a comprehensive laboratory testing program was designed to study the resilience characteristics of unbound granular materials (aggregate base coarse) using the repeated load triaxial test (RLTT). During the experimental program, the resilient modulus of unbound granular material was examined using different moisture content levels, material gradation using Fuller’s equation, and stress levels. The results show that the moisture content, material gradation, and stress level have a major influence on the resilient modulus of unbound granular materials. Furthermore, a linear model has been developed between moisture content and the resilient modulus. The model significantly predicts the change in resilient modulus by changing moisture content. The study also aimed to improve the modified Uzan model by adding the effect of moisture content. An improved modified Uzan stress moisture model has been developed, which shows a strong relationship between the resilient modulus, stress, and moisture content. This study can be used as a benchmark for validating other numerical data.

show abstract

“…It is worth noting that all the triaxial stress-strain curves appear a smooth variation trend, indicating that the cemented rock sample experiences stable and gradual failure during the compression process. This phenomenon can be explained by two reasons: (1) with the development of the internal pore structure of the cemented rock, the rock particles are relatively loose, and the stress mutation is hardly induced by the accumulative energy inside the rock sample, and (2) due to the coupling mechanism of seepage and stress, the ductility of rock samples is increased. As a result, gradual and steady failure is caused inside the rock samples.…”

Section: Triaxial Mechanical Characteristics Of Cemented Rock Samplesmentioning

confidence: 99%

“…The fault zone is a common geological structure in coal mining activities, and the broken rocks in the fault zone are generally in a weakly cemented state [1,2]. When the underground aquifer is adjacent to the fault zone, the evolution of the seepage field and the development of the fracture zone constantly interact with each other [3,4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Seepage and Fracture Characteristics of Cemented Rock Samples under Triaxial Stress

2021

Lithosphere

View full text Add to dashboard Cite

To study the seepage and fracture characteristics of cemented rock strata, a series of triaxial seepage tests on cemented rock samples under different confining pressures and water pressures were carried out in this study. The triaxial strength, elastic modulus, volume strain, and the permeability of the cemented rock samples were analyzed by the seepage unit connection probability model and Kozeny-Carman model. Based on test results, the stress state of cemented rock samples was divided into four stages: nonlinear compaction stage, linear elastic stage, stress yield stage, and failure and postfailure stage. The triaxial strength of the cemented rock samples gradually increased with the increase of confining pressure but decreased with the increase of water pressure. The elastic modulus of the cemented rock sample increased with the increase of confining pressure but decreased with the increase of water pressure. Besides, the volume strain of the cemented rock sample was analyzed, and the volume strain change of the cemented rock sample was also classified into three stages: the increasing stage of crack volume strain, the stable stage of crack volume strain, and the decreasing stage of crack volume strain. Based on the results of triaxial seepage tests, the evolution of permeability was divided into the declining stage, increasing stage, and redescend stage. Through the seepage unit connection probability model and Kozeny-Carman model, the evolution of crack volume was obtained, and the evolution of crack volume with axial strain was also classified into three stages: the original pore closure stage, crack network expansion stage, and crack network closure stage. The permeability evolution and the crack volume evolution were also compared. The comparison results suggest that three stages of crack volume evolution are all ahead of three stages of permeability evolution, verifying that the crack propagation induces the formation of seepage channels in cemented rock samples. This research will provide a valuable reference for the study of instability and water inrush mechanism in cemented rock strata.

show abstract

Permanent Deformation Prediction Model of Unbound Granular Materials for Flexible Pavement Design

Cited by 17 publications

References 30 publications

Research on Design Indicators for Graded Crushed Stone Mixture Based on Vibration Molding Method

Research on Design Indicators for Graded Crushed Stone Mixture Based on Vibration Molding Method

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

Experimental Study on Seepage and Fracture Characteristics of Cemented Rock Samples under Triaxial Stress

Contact Info

Product

Resources

About