Quantitative assessment and mechanism analysis of modification approaches for cold recycled mixtures with asphalt emulsion

Dong, Shi; Wang, Decai; Hao, Peiwen; Zhang, Qing; Jing, Bi; Chen, Wenfu

doi:10.1016/j.jclepro.2021.129163

Cited by 33 publications

(6 citation statements)

References 31 publications

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“…The freeze-thaw indirect tensile strength test and water-immersed Marshall test were applied to illustrate the ability of asphalt mixtures to resist water damage where the tensile strength ratio (TSR) and residual Marshall stability (MS 0 ) were the final evaluation indicators. The equations can be obtained from [29]. Bending beam rheological (BBR) test was applied to accurately assess the resistance to the low-temperature deformation of modified samples.…”

Section: Test Methodsmentioning

confidence: 99%

Preparation and Performance of Bitumen Modified by Melt-Blown Fabric of Waste Mask Based on Grey Relational and Radar Chart Analysis

Cheng,

Zheng,

Zhang

et al. 2024

Polymers

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To effectively utilize waste mask materials in road engineering and minimize resource waste, the melt-blown fabric (MBF) of waste masks was utilized to modify the virgin bitumen. The preparation process of MBF-modified bitumen was investigated, and the physical and rheological properties of bitumen were measured. Subsequently, the blending mechanism during preparation and the dispersion morphology of the modifier were explored. Finally, the pavement performance of the mixture was investigated, and a radar chart analysis was performed to quantitatively assess the effects of MBF modification. Results suggested that the recommended preparation process of shear time, shear rate, and shear temperature was 170 °C, 4000 r/min, and 15 min, respectively. MBF enhanced the high-temperature stability of the binder and weakened the temperature susceptibility. The modification was primarily a physical process. No network structure and agglomeration formed in the bitumen after modification. The addition of MBF significantly improved the resistance of the asphalt mixture to a high-temperature deformation and water damage but harmed its low-temperature crack resistance. The comprehensive assessment results of 0% (f1), 1% (f2), 3% (f3), and 5% (f4) MBF to improve the properties of the mixture were in the following order: f3>f4>f2>f1, where the impact of 3% MBF was the most significant, followed by 5% and 1% MBF.

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Section: Test Methodsmentioning

confidence: 99%

Preparation and Performance of Bitumen Modified by Melt-Blown Fabric of Waste Mask Based on Grey Relational and Radar Chart Analysis

Cheng,

Zheng,

Zhang

et al. 2024

Polymers

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“…In the improved radar chart evaluation method, the evaluation vector and evaluation function were constructed by extracting feature vectors to comprehensively reflect the level of RAM and the balanced development degree of each index [ 37 ]. Firstly, a matrix A = ( a ij )n × k for the evaluation indicators was established.…”

Section: Methodsmentioning

confidence: 99%

Quantitative Assessment of Road Performance of Recycled Asphalt Mixtures Incorporated with Steel Slag

Wang

Yang

et al. 2022

Materials

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Circular utilization of reclaimed asphalt pavement (RAP) has received extensive attention for its economic and environmental benefits. The application of recycled asphalt mixtures (RAM) in the upper layer of asphalt pavement faces the issue of inferior anti-slip performance and durability. This study aims to recycle steel slag as virgin aggregates in RAM and quantitatively evaluate the service performance of RAM with steel slag. Steel slag and basalt RAM were firstly fabricated and the five different RAP contents were involved. Then tests of Marshall stability, indirect tensile strength and Cantabro spatter loss were conducted to investigate the moisture susceptibility of RAM. Moreover, their high temperature stability, crack resistance and skid resistance were characterized. Indirect tensile fatigue test combined with Hamburg wheel tracking test were carried out to discuss the durability of RAM. The comprehensive performance of RAM with steel slag were quantitatively assessed based on an improved radar chart evaluation method. The results show that involving steel slag reveals a remarkable enhancement function on water stability, high and low temperature performance, skid resistance and fatigue resistance of RAM. Steel slag RAM with 50% RAP content demonstrates a rutting depth of 7.60 mm and a creep slope of 2.54 × 10−4, indicating its superior durability in high temperature and water environment. Compared with the comprehensive evaluation function of 0.5336 for basalt RAM with 30% RAP dosage, steel slag RAM reaches 0.7801, which represents its preferable road performance.

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“…Yang Y et al [16] showed cold recycled mixtures had more excellent low-temperature property when adding cement was between 1% and 2%. Dong S et al [17] concluded the rejuvenation agent, styrene-butadiene rubber latex, and Buton rock asphalt could enhance the comprehensive property of the modified CRME. Moreover, the rejuvenation agent had the largest influence.…”

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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Quantitative assessment and mechanism analysis of modification approaches for cold recycled mixtures with asphalt emulsion

Cited by 33 publications

References 31 publications

Preparation and Performance of Bitumen Modified by Melt-Blown Fabric of Waste Mask Based on Grey Relational and Radar Chart Analysis

Preparation and Performance of Bitumen Modified by Melt-Blown Fabric of Waste Mask Based on Grey Relational and Radar Chart Analysis

Quantitative Assessment of Road Performance of Recycled Asphalt Mixtures Incorporated with Steel Slag

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

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