Unsaturated mechanical behaviour of a granular material

Jing, Peng; Nowamooz, Hossein; Chazallon, Cyrille

doi:10.1080/14680629.2018.1447506

Cited by 13 publications

(5 citation statements)

References 25 publications

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“…As for ORCA, stored for a long time, showing negligible self-cementing properties, ε1 p is influenced by water content as other unbound granular materials (Jing et al, 2018;Soliman & Shalaby, 2015), instead of self-cementing properties, as can be seen in Figure 5 An increase of Mr during the first load cycles can be observed, and then gradually reaches to a constant value, for both NRCA and ORCA after different curing times except the NRCA specimens curing 360 and 720 days. This behavior is due to the particle rearrangement and consolidation during the conditioning phase, which is observed also for unbound granular materials (UGM) in a shakedown state by other researchers (Jing et al, 2019;Yang et al, 2008). Interestingly, for NRCA specimens after curing 360 and 720 days, a decrease of Mr during the first Proceedings Paper Formatting Instructions -7 -Rev.…”

Section: Repeated Load Triaxial Testssupporting

confidence: 56%

“…By contrast, the final Mr of ORCA is constant, which is consistent with the evolution of permanent deformation.An increase of Mr during the first load cycles can be observed, and then gradually reaches to a constant value, for both NRCA and ORCA after different curing times except the NRCA specimens curing 360 and 720 days. This behavior is due to the particle rearrangement and consolidation during the conditioning phase, which is observed also for unbound granular materials (UGM) in a shakedown state by other researchers(Jing et al, 2019;Yang et al, 2008). Interestingly, for NRCA specimens after curing 360 and 720 days, a decrease of Mr during the first…”

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confidence: 61%

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Study of Mechanical Behavior and Self-Cementing Properties of Recycled Concrete Aggregates under Repeated Loading

Wang,

Chazallon,

Hornych

et al. 2024

International Conference on Road and Airfield Pavement Technology 2023

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It is known that the strength and stiffness of unbound base and subbase layers prepared with recycled concrete aggregates (RCA) increase over time, known as self-cementing properties of RCA. However, the influence of self-cementing properties on the permanent and resilient deformation behavior has not been thoroughly studied. In this study, the permanent and resilient deformation behavior of two RCA, ORCA and NRCA (old and fresh crushed RCA), after different curing times (1, 180, 360 and 720 days), were investigated by conducting a series of repeated load triaxial tests. The results show that the permanent deformation of NRCA, crushed recently, decreases to a negligible value after curing 180 days, and then reaches a constant value. While the resilient modulus of NRCA increases steadily with curing time till the studied curing time (720 days). Besides, the long-term storage reduces the self-cementing properties of ORCA. As a result, the negligible self-cementing properties have no influence on the permanent and resilient deformation behavior of ORCA.

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Section: Repeated Load Triaxial Testssupporting

confidence: 56%

supporting

confidence: 61%

Study of Mechanical Behavior and Self-Cementing Properties of Recycled Concrete Aggregates under Repeated Loading

Wang,

Chazallon,

Hornych

et al. 2024

International Conference on Road and Airfield Pavement Technology 2023

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“…In this study, the suction of UGM Bréfauchet is less than 70 kPa with a reasonable water content range, which is far less than the maximum applied loads during the RLTT. Besides, as we mentioned in the former study for Missillac sand [4,13], the suction corresponds not only to the saturation state but also to the fine content and further the microstructure in aggregates, which influences significantly the deformation behaviour of granular materials under repeated loads. However, for UGM Bréfauchet, the mechanical behaviour is affected gradually by the coarse particle structures which cannot be evaluated by suction.…”

Section: Determination Of Permanent Axial Deformation With Water Contmentioning

confidence: 71%

“…In recent years, the effect of moisture content on deformation behaviour, which was equally important, has been studied by many researchers [4][5][6][7][8][9][10][11][12][13]. These researches showed that the permanent or resilient deformations increased with water content and different prediction models were proposed to evaluate the deformation behaviour of unbound granular materials.…”

Section: Introductionmentioning

confidence: 99%

Hydro-Mechanical Behaviour of an Unbound Granular Base Course Material Used in Low Traffic Pavements

Jing

Chazallon

2020

Materials

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This paper deals with the mechanical behaviour, especially the permanent deformation and resilient deformation of an unbound granular material (UGM) from Bréfauchet quarry which is used as base layer material in low traffic pavements for full-scale tests at IFSTTAR in France. Medium-scale repeated load triaxial tests (RLTT) are carried out at different water contents and the results show that both permanent and resilient deformations increase with water content. Besides, two techniques of fixing the sensors in materials with large particles for RLTTs are proposed and compared with each other. The results suggest that the tube method is more suitable for the UGM for an accurate measurement and a good adaptability is obtained during the RLTT. Based on the test results of UGM Bréfauchet, the modelling work is performed with improved models used previously for a sandy material. It appears that both the permanent and resilient behaviours of different unbound granular materials can be well captured by the proposed equations considering the effects of water content and anisotropy. This study is helpful to understand the evolution of permanent and resilient deformation in different granular layers, especially for the base layer, in low traffic pavements. The verified models can be used for other similar granular materials and this will lead to reducing the number of tests required to predict the deformation behaviour of granular materials.

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“…According to Jing, Nowamooz and Chazallon 17,18 , the quantity of fines improves the rutting resistance, until a critical water content close to saturation. Indeed, before binder extraction, the fines are trapped in the mastic coating, while after the extraction the fines are released and lead to a reduction of the rutting.…”

Section: Repeated Load Triaxial (Rlt) Testsmentioning

confidence: 99%

Study of the Influence of the Mastic Coating of Untreated Reclaimed Asphalt Pavement on the Permanent and Resilient Behavior

et al. 2021

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Asphalt aggregates arise from the demolition of asphalt road layers. The ORRAP (Optimal Recycling of Reclaimed Asphalts in low-traffic Pavements) Project concerns the cold recycling of 100% Reclaimed Asphalt Pavement (RAP) without binder addition in base and subbase layers of low-traffic roads. In this context, a test program was performed with Rhine Region materials to evaluate the impact of the mastic coating of untreated RAP. A source of reclaimed asphalts with 4.4% of bitumen is tested before (RAP) and after binder extraction (RAP-BE), then is compared to an unbound granular material (UGM) with a similar particle size distribution. Repeated Load Triaxial (RLT) tests were conducted at several frequencies to study the permanent and resilient behaviors. The results show that the RAP before binder extraction and the UGM present similar permanent behaviors, while the aggregates without binder reveal low strains. Concerning the resilient phase, the RAP and the RAP-BE show similar levels of strains, but the resilient moduli

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Unsaturated mechanical behaviour of a granular material

Cited by 13 publications

References 25 publications

Study of Mechanical Behavior and Self-Cementing Properties of Recycled Concrete Aggregates under Repeated Loading

Study of Mechanical Behavior and Self-Cementing Properties of Recycled Concrete Aggregates under Repeated Loading

Hydro-Mechanical Behaviour of an Unbound Granular Base Course Material Used in Low Traffic Pavements

Study of the Influence of the Mastic Coating of Untreated Reclaimed Asphalt Pavement on the Permanent and Resilient Behavior

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