Evaluation of Innovative Cold Mix Recycled Asphalt Concrete as Backfill Material in Pipeline Maintenance

Chen, Shih Huang; Zheng, Wei; Paramitha, Putri Adhitana

doi:10.1520/jte20170773

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…If improper backfill is used in backfilling it will have a greater impact on the road life. Chen et al 52 developed a cold mix recycled asphalt concrete as a backfill material for pipeline maintenance that has better mechanical properties and a shorter construction time.…”

Section: Application Of Thermoelectric Technology In Pavement Energy ...mentioning

confidence: 99%

Recent advances in thermoelectric technology to harvest energy from the pavement

Jian

Zhou

Wang

et al. 2022

Intl J of Energy Research

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Summary Reducing the excessive use of fossil fuels and developing new sustainable energy sources are challenges and urgent issues people face today. Pavements are rich in thermal energy when exposed to the sun for long periods of time. Thermoelectric technology allows for the conversion of thermal and electrical energy from the temperature difference that exists between the pavement and the underground. Thermoelectric technology applied to pavements could not only harvest energy to power wireless sensors, LED lights or store it in supercapacitors, but also absorb the temperature of the pavement to reduce damage to the pavement. The review summarized previous pavement thermoelectric energy harvesting systems in the areas of the types, advantages and disadvantages, power generation, and economic benefits. Methods to improve the conversion efficiency of thermoelectric energy harvesting devices are discussed in detail, especially the optimization of the cold end, the external environment, and the structure. Starting from the properties of thermoelectric cementitious composites, the applications and future developments of thermoelectric cementitious composites are presented in more detail. The thermoelectric cementitious composites are grouped into thermoelectric pavement energy harvesting solid systems. Finally, the integrated use of thermoelectric generator and thermoelectric cementitious composites for road energy harvesting is proposed. The article provided directions and references for future research on thermoelectric technology in pavement energy harvesting.

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Section: Application Of Thermoelectric Technology In Pavement Energy ...mentioning

confidence: 99%

Recent advances in thermoelectric technology to harvest energy from the pavement

Jian

Zhou

Wang

et al. 2022

Intl J of Energy Research

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“…A large amount of reclaimed asphalt pavement (RAP) is produced every year, which not only takes up a lot of land but also causes serious pollution to the environment. Therefore, cold recycled technology has been rapidly developed all over the world due to its advantages in resources and environments, such as the high RAP utilization ratio, energy conservation, and emissions reduction [1,2]. However, the cold recycled mixtures may have poor fatigue cracking resistance due to their high air void (8-14%) [3].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Cracking Evolution and Model of Cold Recycled Asphalt Mixtures during Different Curing Times

et al. 2022

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This paper aims to investigate the fatigue cracking evolution of cold recycled asphalt mixtures with asphalt emulsion (CRME) under different curing times. The fatigue cracking model of CRME based on damage mechanics and fracture mechanics was analyzed according to the fatigue loading curve. Firstly, the fatigue cracking evolution of CRME was studied through an SCB strength test and SCB fatigue test. Then, the fatigue damage mechanics were used to establish a nonlinear fatigue cracking model, and the damage degree of CRME at the initial cracking point was determined. The Paris formula was used to characterize the law of fatigue crack propagation. Finally, the microstructure of CRME was observed by scanning electron microscopy (SEM) with the backscattering method. The results indicate that the initial cracking point appears at around 60% of the fatigue life according to the SCB fatigue test by means of image analysis. The damage variable was obtained through the cracking model, and the value of the damage variable was determined as 0.06–0.17 at the initial cracking point. In addition, the Paris formula showed that the crack growth of CRME can be reflected by the stress intensity factor and correlative parameters. Moreover, cement hydration products were mixed with the asphalt membrane to form a denser spatial structure during the curing process, which may provide higher fatigue performance of CRME. This research may provide a theoretical reference for studying the fatigue cracking behavior of CRME.

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“…However, the application of RAP in hot-mix asphalt (HMA) and warm-mix asphalt (WMA) technology may face the problem of secondary aging of asphalt [6,7], which significantly weakens the performance and service life of the corresponding asphalt-mixture and pavement structure [8,9]. Although modifiers such as styrene-butadiene-styrene (SBS), styrene-butadiene-rubber (SBR), and polyethylene (PE) can improve its performance, the asphalt mixture may still be prone to aging than the original asphalt [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Characterization of Warm‐Mix Rejuvenated Bioasphalt

Zhang

Zhen-jun

et al. 2020

Advances in Civil Engineering

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Reclaimed asphalt pavement (RAP) material is generally under a large amount of aged asphalt coated on the surface of the aggregates, which often limits its (RAP) wide application. Bioasphalt is a renewable material with constituent components that are comparable to regular petroleum asphalt and has the potential to rejuvenate the performance of the aged asphalt in RAP materials. In this laboratory study, the optimum bioasphalt dosage for rejuvenating and optimizing warm-mix rejuvenated bioasphalt (WBA) performance, in the presence of styrene-butadiene-styrene (SBS) and naphthenic oil additives, was investigated. The laboratory test results of the single-factor and orthogonal experiment indicated that the optimal dosage of bioasphalt in WBA was 30% at 4% SBS and 10% naphthenic oil, respectively. The test results further indicated that the WBA’s ductility properties were highly responsive to the bioasphalt dosage. Naphthenic oil, on the other hand, had the greatest impact on the WBA fluidity. Likewise, the Brookfield viscosity experimentation showed that the fluidity of WBA and aged asphalt with different contents at 30%, 40%, 50%, 60%, and 70%, respectively, satisfactorily met the Chinese construction requirements. The adhesion test indicated excellent adhesion and good moisture stability properties for WBA. The resultant PG grades of WBA blended with 40% and 70% aged asphalt were PG 64-34 and PG 70-22, respectively. Microstructure and surface morphology analysis showed carbonyl absorption peaks with high rejuvenation and surface-crack repair potential for the WBA over the control asphalt that was evaluated in the study.

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Evaluation of Innovative Cold Mix Recycled Asphalt Concrete as Backfill Material in Pipeline Maintenance

Cited by 9 publications

References 14 publications

Recent advances in thermoelectric technology to harvest energy from the pavement

Recent advances in thermoelectric technology to harvest energy from the pavement

Fatigue Cracking Evolution and Model of Cold Recycled Asphalt Mixtures during Different Curing Times

Preparation and Performance Characterization of Warm‐Mix Rejuvenated Bioasphalt

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