Effect of rejuvenating agents on stone matrix asphalt mixtures incorporating RAP

Devulapalli, Lekhaz; Kothandaraman, Saravanan; Sarang, Goutham

doi:10.1016/j.conbuildmat.2020.119298

Cited by 51 publications

(19 citation statements)

References 36 publications

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“…Steel slag has a higher specific gravity of between 3.01 and 3.67 [44][45][46][47], although coconut waste and palm oil shells have high absorption values of between 13.8 and 25% because of their porous structure [48][49][50][51][52]. The Los Angeles abrasion for the wastes ranges between 11.29 and 25.3% [44,45,[53][54][55][56][57][58][59][60], which is lower than the 55% for CBA [24]. The lower Los Angeles abrasion values indicate that the materials are tougher and more resistant to abrasion than CBA.…”

Section: Chemical Propertiesmentioning

confidence: 99%

A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry

et al. 2021

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One effective method to minimize the increasing cost in the construction industry is by using coal bottom ash waste as a substitute material. The high volume of coal bottom ash waste generated each year and the improper disposal methods have raised a grave pollution concern because of the harmful impact of the waste on the environment and human health. Recycling coal bottom ash is an effective way to reduce the problems associated with its disposal. This paper reviews the current physical and chemical and utilization of coal bottom ash as a substitute material in the construction industry. The main objective of this review is to highlight the potential of recycling bottom ash in the field of civil construction. This review encourages and promotes effective recycling of coal bottom ash and identifies the vast range of coal bottom ash applications in the construction industry.

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Section: Chemical Propertiesmentioning

confidence: 99%

A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry

et al. 2021

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“…Just 360 million metric tons of asphalt pavement are produced annually in the U.S. [ 3 ], being the world’s most recycled building material, which can be processed and used to replace virgin aggregates and binders [ 4 , 5 , 6 ]. According to the Federal Highway Administration (FHWA), approximately 100 million tons of hot mix asphalt (HMA) are produced each year [ 7 , 8 , 9 ], as it is the most widely used paving material in the world [ 4 , 10 ]. Thus, the road sector is moving towards sustainable development, as it aims to reduce the consumption of nonrenewable resources [ 5 , 11 , 12 ] through reclaimed asphalt pavements (RAP) [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, if 100% of the RAP is used, the need for virgin materials would be reduced, thereby inducing sustainability in pavements [ 11 ]; hence, RAP has been widely used because it helps to reduce costs in the construction of flexible pavements, conserves natural resources [ 4 , 8 , 17 , 18 , 19 , 20 ], requires low amounts of energy and fuel [ 1 , 9 ], eliminates solid waste, and reduces the carbon footprint [ 3 , 10 , 11 , 12 ]. In this sense, according to Debbarma and G. D. Ransinchung [ 21 ], there were reductions of 67% and 18% in cost and gas emissions, respectively, when RAP was used in asphalt mixtures, while CO 2 emissions were reduced by 2%.…”

Section: Introductionmentioning

confidence: 99%

“…Low RAP levels (<50%) do not greatly affect the resistance, porosity, water absorption, reduced rutting, increased tensile strength, or modulus [ 1 , 2 , 3 , 7 , 9 , 11 , 15 ]. Additionally, as the RAP content increases, the cracking deterioration [ 5 , 8 , 12 , 34 , 35 , 36 ] and susceptibility to moisture increase [ 10 ], while the dynamic modulus and tensile strength decrease [ 15 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

et al. 2022

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Reclaimed asphalt pavements (RAP) provide economic and environmental benefits. In recent decades, their use has increased, but rheological properties are affected by RAP aging, increasing stiffness, cracking, and susceptibility to water. To counteract these effects, rejuvenating agents are used, but they must be properly dosed to design quality mixtures. Therefore, different binders were analyzed, including virgin binder (VBB), binder modified by SBS polymer (MB), AC-RAP, binder softened using a rejuvenating agent, and binders softened with doses (15%, 30%, and 45%) of AC-RAP. The rheological properties were evaluated by dynamic shear rheometry (DSR) and beam-bending rheometry (BBR) tests, while the linear amplitude sweep (LAS) test was used to measure fatigue cracking and the multiple stress creep recovery (MSCR) test was used to measure rutting. A mixing chart was constructed based on a high temperature AC-RAP to satisfy the performance grade (PG 76-22). The results showed that softened binders become flexible, but when AC-RAP is added, they turn stiff and behave better than MB. Moreover, combining a rejuvenating agent and AC-RAP reduces the aging stiffness of RAP, improving its rheological properties without compromising the rutting or cracking resistance.

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“…Roads infrastructure has changed from being construction oriented to focusing on both construction and maintenance. Due to advantages of smooth surfaces, comfortable driving conditions and convenient maintenance, asphalt pavement has become the main form of pavement in China, accounting for more than 80% of the total pavement area [ 2 ]. Milling the original existing pavement surfaces and then paving the new asphalt pavement is the most common form of maintenance treatment for asphalt pavement, producing a lot of waste asphalt mixture which causes environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

Wei

Zhu

et al. 2021

Materials

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Recycling of reclaimed asphalt pavement (RAP) has gradually emerged as a hot topic in the current research of building materials. Manufacturing the recycled asphalt mixture with a high RAP content still remains a major challenge due to the problem of inferior water damage resistance and fatigue cracking resistance. The aim of this study is to evaluate the servicing performance of recycled asphalt mixture with high percentage of RAP and assess its environmental impact on volatile organic compounds (VOCs) emission. To further explore the intrinsic factor on the performance of a recycled asphalt mixture, the mixed asphalt binder with a different content of extracted RAP binder was firstly investigated. The results show that the larger the content of RAP binder, the lower the mechanical indexes and VOCs emission. There exists an internal relationship between the chemical composition and VOCs release behavior with the variation of the recycled asphalt binder content. Based on the results of mixed recycled asphalt binder, the road servicing performance of a rather high utilization of RAP (i.e., 50%, 60%, and 70%) was assessed. It was found that the reuse of RAP aggregates has little influence on the volume performance of recycled asphalt mixture, and servicing performances still meet the construction requirements in spite of a descending trend. Moreover, a significant reduction effect on VOCs emission was found in the mixing stage of recycled asphalt mixture, indicating that the VOCs emission can be decreased by 94.82% when the content of RAP aggregates increases to 70%. The recycling of RAP with a high content contributes to the sustainable development of road engineering and the construction of green pavements.

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Effect of rejuvenating agents on stone matrix asphalt mixtures incorporating RAP

Cited by 51 publications

References 36 publications

A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry

A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry

Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

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