Laboratory study of the effect of oil-based recycling agents on high RAP asphalt mixtures

Moniri, Ali; Ziari, Hassan; Aliha, M.R.M.; Saghafi, Yasha

doi:10.1080/10298436.2019.1696461

Cited by 45 publications

(18 citation statements)

References 62 publications

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“…Under such conditions, the probability of initiation and then propagation of microcracks in the mastic part or from the interface of aggregates/bitumen increases noticeably and brittle fracture is the major failure mode of pavements, and there are many research works investigating the strength properties, cracking behaviour and load carrying capacity of cracked asphaltic mixtures and concrete materials using different laboratory investigations. [1][2][3][4][5][6][7][8][9][10][11] Among the possible deformation modes (e.g., mode I or opening mode, mode II or in-plane sliding mode and mode III or out-of-plane sliding mode), tensile type or mode I fracture induced by passing the vehicles from the surface of cracked overlay or thermal stress cycles is the most common mode of pavement cracking. For estimating the repair or rehabilitation time of overlays, it is necessary to know a valid and suitable value of mode I fracture toughness (K Ic ) of asphalt concrete.…”

Section: Introductionmentioning

confidence: 99%

Specimen type effect on measured low‐temperature fracture toughness of asphalt concrete

Shahryari

Keymanesh

Aliha

2020

Fatigue Fract Eng Mat Struct

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Mode I fracture resistance of two asphalt mixtures (control and modified with low‐density polyethylene [LDPE] as binder additive) was studied experimentally and theoretically. The fracture toughness experiments were conducted on edge notch disc bend, edge notch disc compression and semi‐circular bend configurations under two loading rates and two low temperatures. The fracture resistance was increased by increasing the loading rate, reducing the test temperature and adding the LDPE additive. A discrepancy due to the influence of specimen geometry and its loading type was also observed on the measured critical stress intensity factors, demonstrating the effect of specimen type on mode I fracture behaviour. By considering the maximum normal strain value as constant material property and taking into account the effect of T‐stress, the fracture toughness value for any of the investigated mode I samples was estimated in terms of the fracture results of the other specimens.

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Section: Introductionmentioning

confidence: 99%

Specimen type effect on measured low‐temperature fracture toughness of asphalt concrete

Shahryari

Keymanesh

Aliha

2020

Fatigue Fract Eng Mat Struct

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“…Moniri explored the resilient modulus, moisture susceptibility and rutting resistance of RAP mixtures containing Cyclogen rejuvenator. Tey indicated that these features improved by increasing RAP content in mixtures containing Cyclogen compared to HMA mixtures [35]. Ziari et al also revealed similar results and showed that the resilient modulus, rutting resistance, and indirect tensile strength (ITS) of Cyclogen rejuvenated mixtures containing RAP materials were higher than the control mixture [36].…”

Section: Introductionmentioning

confidence: 83%

“…RAP materials and virgin aggregates were then mixed with the asphalt binder for 1 minute in a bucket mixer. Ten, each rejuvenator was added directly to the mixing of heated aggregates and binder immediately before mixing for each fabricated sample, and they were mixed in a bucket mixer with the rejuvenator for 5 minutes, regarding previous studies [35,[47][48][49]. Te air voids amount of fnal HMA and RAP mixtures for the moisture sensitivity and rutting performance was 7 ± 0.5%.…”

Section: Methodsmentioning

confidence: 99%

Laboratory Investigation of Reclaimed Asphalt Mixtures Containing Cyclogen and Vacuum Bottom Rejuvenators

Ziari

Mojaradi

Saadatjoo

et al. 2023

Advances in Civil Engineering

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The use of reclaimed asphalt pavement (RAP) to create recycled asphalt mixture is attracting great interest because of landfill space decrease and natural resources saving. Also, incorporating rejuvenators is an effective method to promote the utilization of RAP materials in hot mix asphalt (HMA) production. The main goal of this study was to evaluate the effect of Cyclogen and vacuum bottom (VB) rejuvenators on the performance of RAP mixtures against moisture sensitivity, rutting resistance, and tensile strength. In this regard, mixtures were constructed with different RAP contents (0, 35, and 70% by asphalt mix weight) and virgin aggregates. Furthermore, three contents of Cyclogen (0, 5, and 10%) and VB (0, 15, and 30%) by the weight of RAP binder were used. The laboratory test results revealed that RAP materials enhanced the indirect tensile strength, rutting resistance, and moisture sensitivity of asphalt samples. Moreover, increasing RAP content improved the rutting resistance and permanent deformations of asphalt samples. The addition of RAP also enhanced the resilient modulus and tensile strength of asphalt samples; this increase was subject to RAP content applied. Furthermore, the effect of rejuvenators on the performance characteristics of RAP mixtures showed that adding VB and Cyclogen decreased tensile strength, resilient modulus, and strain creep and increased the moisture sensitivity of RAP mixtures.

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“…Notably, higher percentage of rejuvenators exerted greater effect on the ageing aspect of the asphalt samples. Another study used Cyclogen and Rapiol as the rejuvenating agents to restore the performance of asphalt mixtures with 0%, 25%, 50%, 75%, and 100% RAP materials [98]. It was found that the mixtures with RAP material had higher resistance against rutting and moisture damage.…”

Section: Rejuvenation Of Recycled Asphalt Using Commercial Rejuvenatorsmentioning

confidence: 99%

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

et al. 2021

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Reclaimed asphalt pavement (RAP) has received much attention recently due to its increased use in hot mix asphalt (HMA) pavements to enhance pavement sustainability. The use of aged asphalt in RAP, which is highly oxidised and has lost its properties due to exposure to traffic loads and climatic conditions throughout its lifespan, can cause asphalt mixtures to stiffen and embrittle, thus negatively affecting the behaviour of asphalt mixtures. This issue may be resolved by including rejuvenating agents that can restore both physical and rheological properties of aged asphalt by increasing maltene fractions and decreasing asphaltene. However, the high restoration capacity of any kind of rejuvenating agent does not assure the durability of restored aged asphalt. This study explored the performance and durability of rejuvenated asphalt mixtures embedded with several types of rejuvenators identified from the extensive literature review. The study serves as a significant reference to predict future challenges in rejuvenating aged asphalt.

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Laboratory study of the effect of oil-based recycling agents on high RAP asphalt mixtures

Cited by 45 publications

References 62 publications

Specimen type effect on measured low‐temperature fracture toughness of asphalt concrete

Specimen type effect on measured low‐temperature fracture toughness of asphalt concrete

Laboratory Investigation of Reclaimed Asphalt Mixtures Containing Cyclogen and Vacuum Bottom Rejuvenators

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

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