Short-term resilient behaviour and its evolution with curing in cold in-place recycled asphalt mixtures

Orosa, P.; Pérez, Ignacio Pérez; Pasandín, A.R.

doi:10.1016/j.conbuildmat.2022.126559

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…Saadoon et al [22] investigated cold asphalt mixture samples with different contents and types of cement and proposed a new model to predict the contribution of cement hydration products to the total stability of cold asphalt mixtures. Orosa et al [23] evaluated the short-term resilient behavior and found water loss during curing and stiffness increase were related. Ogbo et al [24] explored the relationship between the amount of moisture in CIR and the mechanical properties of CIR.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Promoting Effect of Complex Conditions on the Adhesion Development in Curing Process of Cold Recycling Mixture with Emulsified Asphalt

Zhao,

2024

Advances in Civil Engineering

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The curing process of cold recycling mixture with emulsified asphalt is a process of emulsion breaking, water evaporation, and cement hydration, resulting in adhesion development and strength formation. There are many factors that affect this process, including curing temperature, curing time, reclaimed asphalt pavement (RAP) contents, and cement contents. However, the evaluation of the promoting effect of each factor is still not quite clear. Hence, in this paper, the curing temperature, curing time, and RAP contents were discussed to find out the dominating factor in this process. The development of moisture loss and indirect tensile strength (ITS) was measured and analyzed through establishing prediction models between them and curing time. Besides, the functional relationship between moisture loss and ITS was also analyzed to evaluate the promoting effect of each factor. The results showed that the curing temperature has a certain impact on the development of moisture loss and ITS and an increase in curing temperature would accelerate the reaction rate, while RAP contents can hardly affect this process. Through functional relationship between moisture loss and ITS, it was found that the development of early strength and adhesion was dominated by ITS despite the increase of curing temperature and RAP contents. Expanding the hydration effect of cement could promote the curing process. However, this dominating role weakened at higher temperature and moisture loss should be treated more carefully.

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Section: Introductionmentioning

confidence: 99%

Measurement of the Promoting Effect of Complex Conditions on the Adhesion Development in Curing Process of Cold Recycling Mixture with Emulsified Asphalt

Zhao,

2024

Advances in Civil Engineering

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“…Increasing the cement content in this composite leads to variations in the microstructure of the co-binder, and consequently increases the stiffness and decreases the temperature dependence of the mechanical properties [15][16][17]. Despite such variability, a common feature of BE-CIR mixtures' mechanical performance is their evolutionary behavior with curing time [18][19][20]. During the curing process, the water content is reduced to equilibrium with the surroundings due to evaporation, and the mixture evolves from the short-term "fresh" state to the long-term "hardened" state under the interaction of different physical and chemical mechanisms, including emulsion breaking and setting and cement hydration.…”

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

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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.

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“…Cold recycled asphalt mixtures (CRAM) are CAM including high RAP contents, even 100%. Moreover, CRAM mixtures contain bitumen emulsion or foamed bitumen, water (to facilitate the blending process), active filler (Portland cement or hydrated lime) and, if necessary, natural aggregates for the correction of the gradation [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Cold Recycled Asphalt Mixtures including Reinforcing Fibers

Carpani,

Bocci,

Bocci

2023

Sustainability

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In recent years, cold recycling techniques have been widely used all over the world thanks to their huge environmental advantages. However, their performances are lower than the traditional hot-mix asphalt, both for the longer time to develop the final mechanical properties, which leads to delays in the reopening to road traffic, and for the lower fatigue resistance. The present paper deals with the characterization of cold recycled asphalt mixtures (CRAM), made with 100% reclaimed asphalt pavement, where synthetic fibers were included to improve the fatigue performance. The investigation involved the analysis of the curing time, volumetric properties, stiffness, strength, rheological behavior and resistance to cyclic loading. The results showed that the use of synthetic fiber, with the optimum dosage, determined a higher CRAM performance, especially in terms of fatigue resistance.

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Short-term resilient behaviour and its evolution with curing in cold in-place recycled asphalt mixtures

Cited by 15 publications

References 27 publications

Measurement of the Promoting Effect of Complex Conditions on the Adhesion Development in Curing Process of Cold Recycling Mixture with Emulsified Asphalt

Measurement of the Promoting Effect of Complex Conditions on the Adhesion Development in Curing Process of Cold Recycling Mixture with Emulsified Asphalt

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

Characterization of Cold Recycled Asphalt Mixtures including Reinforcing Fibers

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