Effect of gradation on volumetric and mechanical properties of cold recycled mixtures (CRM)

Raschia, Simone; Mignini, Chiara; Graziani, Andrea; Carter, Alan; Perraton, Daniel; Vaillancourt, Michel

doi:10.1080/14680629.2019.1633754

Cited by 23 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the wide variation in the component materials, the mechanical performance of BE-CIR mixtures is a combination of the properties of the bitumen and the cement [14]. Bitumen is a viscoelastic binder with low stiffness, while cement is a hydraulic binder with brittle hydration products and high compressive strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Cracking Resistance Gradient of Bitumen Emulsion-Based Cold In-Place Recycling Mixtures over Curing by Semi-Circular Bending Test

Zhao,

Jiang,

2023

Coatings

View full text Add to dashboard Cite

To better reveal the performance development of bitumen emulsion-based cold in-place recycling (BE-CIR) mixture over curing, a semi-sealed laboratory curing method was proposed in this research to simulate the in situ moisture evaporation process and cracking resistance of the BE-CIR specimen at different depths during a curing time of 28 days, which was also investigated by the semi-circular bending (SCB) test. The influencing factors of cement content (1.5% to 2.5%), initial moisture content (3.5% to 4.5%), curing temperature (25 °C to 45 °C) and relative humidity were investigated, and the significance of different factors affecting the performance development was also analyzed. The results indicate significant variations in cracking performance parameters at different depths, with the top part exhibiting notably higher tensile strength and fracture energy compared to the bottom part, and a gradient index (GI) is proposed to describe the difference. Cement content affected early tensile strength and fracture energy, while the initial moisture content affected the development rate of the performance. The influence of curing temperature was extensive, and as the temperature increased beyond 40 °C, the strength of the effect decreased. High humidity during the early stage of curing inhibited the strength formation and development of fracture energy. The performance development of the BE-CIR mixture is more significantly influenced by the moisture migration process, which is governed by curing temperature and relative humidity, as opposed to the cement content and initial moisture content.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of the Cracking Resistance Gradient of Bitumen Emulsion-Based Cold In-Place Recycling Mixtures over Curing by Semi-Circular Bending Test

Zhao,

Jiang,

2023

Coatings

View full text Add to dashboard Cite

show abstract

“…Active llers may also be added (portland cement, hydrated lime, and others) to improve some mechanical properties, such as moisture resistance, and to increase early age resistance [5][6][7][8]. CRAM's mechanical behaviour is dependent on various factors, such as the curing process, reclaimed asphalt pavement (RAP) source and gradation, moisture content, type and content of asphalt stabilization agent (foam or emulsion), presence of active llers, and volumetric properties [2,9,10].…”

Section: Introductionmentioning

confidence: 99%

Permanent Deformation Assessment of Cold Recycled Asphalt Mixtures

Silva

Meneses

Vasconcelos

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The objective of this study was to evaluate the behavior in terms of the permanent deformation of four cold recycled asphalt mixtures stabilized with asphalt emulsion and foamed asphalt. The analysis was conducted considering three flow number test procedures adapted for cold recycled mixtures: (i) ABNT NBR 16505 (method A); (ii) adaptation of the FN test for CRAM according to Kim and Lee’s method (method B); (iii) 3D-Move analysis software simulation of pavement structures to address the stress magnitude for the FN test (method C). The influence of the curing process on the performance of the materials was also verified. The study used an extensive database of computed pavement responses from the four different asphalt pavement structures of the experimental section subjected to axial loading of a tandem axle using the 3D-Move pavement response analysis program. The FN results using the 3D-Move data (method C) demonstrated the good mechanical behaviour with respect to permanent deformation of the cold recycled mixtures subject to axial stress and temperature. The method proposed by Kim and Lee (method B) showed little efficacy for the analysis of the CRAMs tested in this work. The ABNT NBR 16505 method (method A), conventionally used for HMA, highlighted the influence of temperature (60°C) on the CRAM mixtures. For all FN test conditions, the curing was a preponderant factor for the performance of cold recycled asphalt mixtures and should be carefully evaluated to simulate the early stage of the mixtures in the field. It is also important to verify the influence of humidity and temperature on the permanent deformation mechanism of cold recycled asphalt mixtures.

show abstract

“…Different types of asphalt concrete possess different features to meet the actual engineering needs. The change in gradation can cause variations in the internal structure of asphalt concrete, showing different macro-performances [ 2 ]. Therefore, it is necessary to evaluate the damage characteristics of different types of asphalt concrete to improve service performance pertinently.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Approach of Fracture Behavior for Asphalt Concrete with Different Aggregate Gradations and Testing Temperatures Using Acoustic Emission Monitoring

Jiao

Chen

et al. 2021

Materials

View full text Add to dashboard Cite

Different aggregate gradations of asphalt concrete possess dissimilar skeleton structures, leading to diverse macroscopic and mechanical characteristics. Acoustic emission (AE) technology can realize real-time monitoring of the whole damage evolution process of materials. The objective of the present investigation was to demonstrate the fracture characteristics of asphalt concrete with three types of aggregate gradations, including dense-graded asphalt concrete (AC), stone mastic asphalt (SMA), and open-graded friction course (OGFC) under indirect tensile load on account of the acoustic emission (AE) technique. The Marshall compaction method was used to prepare specimens, and the indirect tensile test (IDT) and AE monitoring were conducted simultaneously at different temperatures. The corresponding AE parameters containing energy, cumulative energy, count, and cumulative count were adopted to characterize the fracture process of asphalt concrete with different aggregate gradations. The impact of temperature on the damage characteristics of asphalt concrete was also assessed. Test results indicated that the AE parameters could effectively classify the damage stages of asphalt concrete, and specimens with different aggregate gradations exhibited different AE characteristics during failure processes. The combination of AE parameters and cumulative AE parameters can accurately characterize the damage characteristics of asphalt concrete. SMA specimens possessed the best overall performance among these three types of asphalt concrete in terms of the variations in energy and cumulative energy at different temperatures. The findings obtained in this study can provide a practical AE-based evaluation approach for demonstrating the fracture mechanism of asphalt concrete with different aggregate gradations.

show abstract

Effect of gradation on volumetric and mechanical properties of cold recycled mixtures (CRM)

Cited by 23 publications

References 23 publications

Characterization of the Cracking Resistance Gradient of Bitumen Emulsion-Based Cold In-Place Recycling Mixtures over Curing by Semi-Circular Bending Test

Characterization of the Cracking Resistance Gradient of Bitumen Emulsion-Based Cold In-Place Recycling Mixtures over Curing by Semi-Circular Bending Test

Permanent Deformation Assessment of Cold Recycled Asphalt Mixtures

Evaluation Approach of Fracture Behavior for Asphalt Concrete with Different Aggregate Gradations and Testing Temperatures Using Acoustic Emission Monitoring

Contact Info

Product

Resources

About