Research on long-term strength formation and performance evolution with curing in cold recycled asphalt mixture

Han, Dongdong; Liu, Guoqiang; Zhao, Yongli

doi:10.1016/j.cscm.2022.e01757

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Traditionally, the aged asphalt was ignored, and RAP materials could be considered as "black rock," which acted as skeleton in the mixture. However, although the CRME did not undergo the hot regeneration process, the new and aged asphalt would still be blended to a certain extent [27][28][29]. It was possible that the aged asphalt should not be ignored, and it is an important factor for evaluating the performance of RAP materials [27].…”

Section: Raw Materialsmentioning

confidence: 99%

Microstructure in Adhesion Development Process and Strength Formation Mechanism in Early Stage of Cold Recycled Mixture with Emulsified Asphalt

Zhao,

2024

Advances in Civil Engineering

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With the large-scale maintenance and renovation of asphalt pavement, a considerable amount of reclaimed asphalt pavement (RAP) will be generated. Stacking these wastes occupies a large amount of land and seriously damages the ecological environment. Hence, efficient regeneration of RAP through recycling technology has gained more and more attention. In this paper, some topics were reviewed to further promote the cold recycling (CR) technology and better follow-up the research progress. First, it discussed the raw materials and the differences and similarities between cement-emulsified asphalt mortar (CEAM) and cold-recycled mixtures with emulsified asphalt (CRME). Second, it reviewed the adhesion development of emulsified asphalt mastic, the application of X-ray technology in microscopic study of CRME and the characteristic of strength development of CRME. The adhesion development of CRME begins with the process of demulsification and hydration caused by the migration and dissipation of water inside the emulsified asphalt mastic. In addition, many factors would influence this process simultaneously. However, the microbehavior mechanism of internal water transport in emulsified asphalt mortar has not yet been thoroughly revealed, and it lacked scientific measurement research on the promoting effect of complex conditions on the development of adhesive properties of mixtures. Therefore, in this paper, they were suggested for future research.

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Section: Raw Materialsmentioning

confidence: 99%

Microstructure in Adhesion Development Process and Strength Formation Mechanism in Early Stage of Cold Recycled Mixture with Emulsified Asphalt

Zhao,

2024

Advances in Civil Engineering

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“…The nonlinear-least square minimization method was used to fit the test data to the MM model. Several studies used this model to analyse the curing behaviour of CBEM [20][21][22]52]. In this study, moisture loss, Marshal stability, Marshal quotient, RMS, ITS, and ITSR were considered as responses and these are analyzed concerning curing time.…”

Section: Michaelis-menten (Mm) Modelmentioning

confidence: 99%

Impact of curing on the volumetric and mechanical properties of cold bitumen emulsion mix

Prasad

Suman

2023

Eng. Res. Express

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Cold bitumen emulsion mix (CBEM) is an emerging sustainable material for constructing the base or surface layer of flexible pavements, reducing energy consumption and global warming effects compared to hot mix asphalt. The main challenges associated with CBEM are low initial strength, moisture susceptibility, etc. This is primarily due to water encapsulation. The curing process allows the water to evaporate gradually over time, improving mechanical properties. This study investigates CBEM’s volumetric and mechanical properties under different curing conditions. CBEMs were prepared using low (50 blows) and high (75 blows) compaction efforts and cured at 25, 40, and 55 °C for 1 to 28 days. In volumetric characteristics, the air voids and voids in mineral aggregates decreased slightly with curing, while total binder volume decreased. Effective binder volume and voids filled with binder increased slightly, then decreased. The mechanical properties, i.e., Marshal Stability, Marshal Quotient, Indirect Tensile Strength (ITS), and Moisture Susceptibility parameters like the Indirect Tensile Strength Ratio (ITSR) and Retained Marshal Stability (RMS), were found to improve over time at each curing temperature. Using a high curing temperature further improved the mechanical characteristics of CBEM. The curing process was decelerated in case of CBEM prepared by high compactive efforts compared to CBEM prepared by low compactive efforts. The Michaelis-Menten model can be used to analyze moisture loss growth and the development of mechanical properties over time. The strength-maturity model can be developed by using ITS as strength parameters. There was a strong correlation between all mechanical characteristics and moisture loss.

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“…The topic of resource conservation and environmental friendliness has gradually risen to prominence in road construction. Asphalt pavement recycling has become an excellent technique in road construction and maintenance [3,4]. Due to the depression of aggregate, cost, and carbon emissions, cold recycling technology has been widely accepted globally and adopted in many countries [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Research on the Damage Model of Cold Recycled Mixtures with Asphalt Emulsion under Freeze-Thaw Cycles

Yang,

Sun,

Yang

et al. 2023

Processes

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Cold recycled mixtures with asphalt emulsion (CRME) suffer the majority of damage from freezing and thawing cycles in seasonal freezing regions. However, an effective model for describing the internal damage evolution behavior of the CRME is still lacking. The objective of this study is to explore the performance of the destroy and damage model of the CRME subjected to freezing and thawing cycles with various water contents. The damage degree of performance at 60 °C and −10 °C, as well as the mechanical properties, were first analyzed in the laboratory. Then, the damage evolution models were established based on macroscopic properties, reliability, and damage theory. The results showed that the performance of the CRME decreased obviously as the number of freezing and thawing cycles increased; after 20 freezing and thawing cycles, the damage degree of 60 °C shear strength and 15 °C and −10 °C indirect tensile strength were 21.5%, 20.6%, and 19.8% at dry condition, but they were 34.9%, 31.8%, and 44.8% at half water saturation condition and 51.5%, 49.1%, and 56.1% at complete water saturation condition; the existence of water and the phase transition of water changed the failure characteristics of the CRME; the correlation coefficient of the damage model parameters was more than 0.98, so the damage evolution model could reveal the internal damage evolution law. Clearly, the freezing and thawing cycles accelerated the damage caused by CRME.

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Research on long-term strength formation and performance evolution with curing in cold recycled asphalt mixture

Cited by 3 publications

References 22 publications

Microstructure in Adhesion Development Process and Strength Formation Mechanism in Early Stage of Cold Recycled Mixture with Emulsified Asphalt

Microstructure in Adhesion Development Process and Strength Formation Mechanism in Early Stage of Cold Recycled Mixture with Emulsified Asphalt

Impact of curing on the volumetric and mechanical properties of cold bitumen emulsion mix

Research on the Damage Model of Cold Recycled Mixtures with Asphalt Emulsion under Freeze-Thaw Cycles

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