Improving moisture sensitivity and mechanical properties of sulfur extended asphalt mixture by nano-antistripping agent

Faramarzi, Masoud; Golestani, Behnam; Lee, K. Wayne

doi:10.1016/j.conbuildmat.2016.12.038

Cited by 39 publications

(9 citation statements)

References 14 publications

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“…Increase in total SFE caused to weakening of adhesion bond which was compatible with achieved results by the performed dynamic modulus test. Shafabakhsh and Faramarzi [18,19] also evaluated adhesion bond between the binder and aggregates in sulfur extended asphalt mixture by the SFE method. In their study, they used nanotechnology Zycotherm (NZ) to improve this bond which was an antistripping additive.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of aggregate type on moisture susceptibility of modified cold recycled mix asphalt: evaluation by mechanical tests and Surface Free Energy method

Latifi

Amini

2020

Frattura Ed Integrità Strutturale

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There are deficiencies associated with cold mix asphalts, specifically, cold recycled mix asphalts in comparison with hot mix asphalt or hot recycled mix asphalt such as higher moisture susceptibility. Moisture damage of asphalt mixtures is inversely related to the bond quality between aggregates and binder. In this study, Portland cement (PC) and acryl polymer (AP) additives were employed to improve this bond. The effectiveness of used additives in improving the moisture susceptibility of cold recycled mix asphalt was examined using Surface Free Energy (SFE) method. Indirect Tensile Strength test and Dynamic Modulus test were performed to validate SFE method results. Moreover, scanning electron microscope (SEM) images were obtained for better understanding of mixture's microstructure. Also, effect of using granite, limestone and recycled asphalt pavement (RAP) aggregates was evaluated. The findings showed that cement and acryl polymer additives improved resistance of different studied mixtures, specifically, cold recycled mix asphalt against moisture damage by improving the adhesion between aggregate and asphalt. Considering effect of aggregates on moisture susceptibility, limestone-mixtures had the highest resistance while the RAPmixtures performed the worst among the three. Finally, it was shown that results of SFE method were compatible with the mechanical tests in predicting moisture damage.

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Section: Literature Reviewmentioning

confidence: 99%

Effect of aggregate type on moisture susceptibility of modified cold recycled mix asphalt: evaluation by mechanical tests and Surface Free Energy method

Latifi

Amini

2020

Frattura Ed Integrità Strutturale

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“…However, some trials were still required to be carried out, and it was necessary to zoom-in to the required resolution to study the dispersion of CBNPs in bitumen. SEM is generally sufficient to study the dispersion of particles [19], however, for more in depth analysis into the size and internal structure of the particles, transmission electron microscopy (TEM) may be preferred.…”

Section: Preparation Of Cbnps Modified Bitumenmentioning

confidence: 99%

Performance Evaluation of Carbon Black Nano-Particle Reinforced Asphalt Mixture

et al. 2018

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Applications of nanotechnology in the pavement industry have increased rapidly during the last decade in order to enhance a pavement’s sustainability and durability. Conventional asphalt binder generally does not provide sufficient resistance against rutting at high temperatures. Carbon black nano-particles (CBNPs, produced by perennial mountain trees’ carbonization) were mixed into the performance grade (PG) 58 asphalt binder in this study. Conventional asphalt binder tests (penetration, ductility and softening point), frequency sweep, performance grading, and bitumen bond strength tests were conducted to study the enhancement in the properties of asphalt binder. Dynamic modulus and wheel tracking tests were also performed to investigate the effect of CBNPs on asphalt mixture properties. Experimental results demonstrated that preferred dosage of CBNPs in asphalt is 10% by weight of the bitumen. Results of scanning electron microscopy (SEM) and storage stability tests validated homogenous and stable dispersion of CBNPs in the asphalt binder. Asphalt mixtures became stiffer and resistant to rutting at high temperatures by addition of CBNPs in asphalt binder. Significant improvement in bitumen aggregate bond strength was also observed by incorporating CBNPs. It is concluded that CBNPs can be used to effectively enhance the high-temperature performance and consequently the sustainability of flexible pavements.

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“…(Asphalt concrete with the addition of sulfur (technical or modified) received the name sulfur-extended asphalt concrete- SEA [ 10 ]). After cooling, crystallization of sulfur particles is observed, which increases the strength of sulfur asphalt concrete [ 11 , 12 , 13 , 14 , 15 , 16 ]. According to X-ray phase analysis, the formation of sulfur crystals is completed on the 7th day after the preparation of the material [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

Le¹,

Korolev²,

Grishina³

et al. 2021

Materials

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The paper presents the results of a study of the mechanism for reducing the moisture resistance of sulfur-extended asphalt concrete. It is shown that a decrease in moisture resistance occurs due to the occurrence of chemical and physical processes. At the same time, it was found that during the manufacture of sulfur-bitumen composites, toxic gases H2S and SO2 are formed, which are capable of interacting with a mineral filler, as well as the interaction of sulfur with a mineral powder with the formation of sulfur-containing water-soluble salts, the extraction of which leads to a decrease in the moisture resistance of sulfur-bitumen materials. The change in the rate of leaching of these substances from the composite is due to the physical process caused by the crystallization of sulfur and the formation of a capillary structure, which significantly increases the rate of leaching of calcium and magnesium salts, which are products of dissolution or hydrolytic decomposition of water-soluble products of the interaction of sulfur, H2S and SO2 gases with calcium and magnesium carbonates. The intensity of chemical and physical processes intensifies with an increase in the amount of sulfur in sulfur-bitumen materials.

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Improving moisture sensitivity and mechanical properties of sulfur extended asphalt mixture by nano-antistripping agent

Cited by 39 publications

References 14 publications

Effect of aggregate type on moisture susceptibility of modified cold recycled mix asphalt: evaluation by mechanical tests and Surface Free Energy method

Effect of aggregate type on moisture susceptibility of modified cold recycled mix asphalt: evaluation by mechanical tests and Surface Free Energy method

Performance Evaluation of Carbon Black Nano-Particle Reinforced Asphalt Mixture

Reasons for Reduced Moisture Resistance of Sulfur-Extended Asphalt Concrete

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