Electrical conductivity of graphite modified asphalt mixture

The use of cup lump rubber as an additive in asphalt binder has recently become the main interest of the paving industry. The innovation helps to increase the natural rubber consumption and stabilize the rubber price. This study evaluates the mechanical performance of cup lump rubber modified asphalt (CMA) mixture in terms of resilient modulus, dynamic creep and indirect tensile strength under aging conditions. The CMA mixture was prepared using dense-graded Marshall-designed mix and the observed behavior was compared with that of conventional mixture. From the results, both mixtures passed the volumetric properties as accordance to Malaysian Public Work Department (PWD) specification. The addition of cup lump rubber provides better resistance against permanent deformation through the enhanced properties of resilient modulus and dynamic creep. Furthermore, the resilient modulus of CMA mixture performed better under aging conditions.

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Methodology of Mixing and Compaction Temperatures for Modified Asphalt Mixture

Road Pavement Material Characterization and Rehabilitation ◽

10.1061/41043(350)5 ◽

2009 ◽

Author(s):

Zheng-qi Zhang ◽

Jing Tao ◽

Bo Yang ◽

Ning-li Li

Keyword(s):

Asphalt Mixture ◽

Modified Asphalt

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Rubber Modified Asphalt Mixture Properties and Mechanical Testing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.810 ◽

2011 ◽

Vol 105-107 ◽

pp. 810-817 ◽

Cited By ~ 2

Author(s):

Rong Hui Zhang ◽

Jia Liu ◽

Jian Chao Huang ◽

Yi Fu

Keyword(s):

Asphalt Pavement ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

Specimen Preparation ◽

Twin Screw Extrusion ◽

Modified Asphalt ◽

Flexural Tensile Strength ◽

Screw Extrusion ◽

Twin Screw ◽

Compound Particle

To solve the high-temperature rutting problem of asphalt pavement, the old rubber of the tire rubber and plastic of general polyethylene waste composite modified asphalt mixture is proposed. The plastic and rubber compound particle was made by the rubber through efficient desulfurization additives, pre-swelling, twin-screw extrusion equipment. The particles mixed with the asphalt mixtures specimen preparation and the dynamic stability experiments, composite beam fatigue experiments, flexural tensile strength and modulus experiments and anti-reflective pavement cracks and other mechanical experiments are performed. The comparative data obtained by the rubber and plastic composited modified asphalt mixtures and SBS asphalt mixtures prove that the rubber and plastic composited modified asphalt mixtures have excellent rutting resistance and fatigue resistance.

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Experimental study on warm mix technology of rubber modified asphalt mixture

Functional Pavement Design ◽

10.1201/9781315643274-39 ◽

2016 ◽

pp. 349-354

Author(s):

Aihong Kang ◽

Mingbu Yao ◽

Xueyang Jiu ◽

Peng Xiao

Keyword(s):

Experimental Study ◽

Asphalt Mixture ◽

Modified Asphalt

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Review on Applications of Lignin in Pavement Engineering: A Recent Survey

Frontiers in Materials ◽

10.3389/fmats.2021.803524 ◽

2022 ◽

Vol 8 ◽

Author(s):

Hui Yao ◽

Yiran Wang ◽

Junfu Liu ◽

Mei Xu ◽

Pengrui Ma ◽

...

Keyword(s):

Low Cost ◽

Asphalt Mixture ◽

Complex Mixture ◽

Development Trend ◽

Environmental Benefits ◽

Extraction Technology ◽

Environmental Friendliness ◽

Modified Asphalt ◽

Soil Stabilizer ◽

Pavement Engineering

Lignin is the second-largest plant polymer on Earth after cellulose. About 98% of lignin produced in the papermaking and pulping industry is used for combustion heating or power generation. Less than 2% of lignin is used in more valuable fields, mainly in the formulation of dispersants, adhesives, and surfactants. Asphalt is one of the most important materials in pavement engineering. It is a dark brown complex mixture composed of hydrocarbons with different molecular weights and their non-metallic derivatives. Because the chemical structure of lignin is similar to that of asphalt, it is a carbon-based hydrocarbon material. More researchers studied the application of lignin in pavement engineering. In this paper, the structure, application, and extraction technology of lignin were summarized. This is a review article describing the different applications of lignin in pavement engineering and exploring the prospects of the application. There are three main types of pavement materials that can be used for lignin in pavement engineering, which are asphalt, asphalt mixture, and roadbed soil. In asphalt, lignin can be used as a modifier, extender, emulsifier, antioxidant, and coupling agent. In asphalt mixtures, lignin can be used as an additive. In road base soils, lignin can be used as a soil stabilizer. Furthermore, the article analyzed the application effects of lignin from the life cycle assessment. The conclusions suggest that lignin-modified asphalt exhibits more viscosity and hardness, and its high-temperature resistance and rutting resistance can be significantly improved compared with conventional asphalt. In addition, some lignin-modified asphalt binders exhibit reduced low-temperature crack resistance and fatigue resistance, which can be adjusted and selected according to the climate change in different regions. The performance of lignin as an asphalt mixture additive and asphalt extender has been proved to be feasible. Lignin can also produce good mechanical properties as well as environmental benefits as a soil stabilizer. In summary, lignin plays an important role in asphalt pavement and roadbed soil, and it is likely to be a development trend in the future due to its environmental friendliness and low cost. More research is needed to generalize the application of lignin in pavement engineering.

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Assessments on the Performance of Asphalt Mixtures Prepared with Adhesion Promoters

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c1002.1183s319 ◽

2019 ◽

Vol 8 (3S3) ◽

pp. 332-339

Keyword(s):

Mechanical Performance ◽

Water Immersion ◽

Asphalt Binder ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

Adhesion Promoters ◽

Modified Asphalt ◽

Service Characteristics ◽

Bonding Properties ◽

Mechanical Performances

Asphalt pavement is typically susceptible to moisture damage. However, it could be improved with the incorporation of additives or modifiers through binder modifications. The objective of the study is to assess the effect of adhesion promoters, namely PBL and M5000, onto the Hot Mix Asphalt (HMA). The performance of asphalt mixture has been assessed in terms of the service characteristics, the bonding properties, and mechanical performances. The service characteristics were assessed through the Workability Index (WI) and Compaction Energy Index (CEI) to evaluate the ease of asphalt mixture during the mixing and compaction stage. The bonding properties of the modified asphalt mixtures were determined using the boiling water test and static water immersion test to signify the degree of coating after undergoing specific conditioning period and temperature. The mechanical performances of the modified asphalt mixture were evaluated via Marshall stability, semi-circular bending, and modified Lottman tests. All specimens were prepared by incorporating adhesion promoters at the dosage rates of 0.5% and 1.0% by weight of asphalt binder. From the investigation, the bonding properties significantly improved for the modified asphalt mixture compared to the control mixture. The WI of the modified asphalt mixture increased while the CEI decreased in comparison to the control specimen. This implies the workability of modified asphalt mixture is better and requires less energy to be compacted. Modified asphalt mixture generally had better mechanical performance. Therefore, it can be deduced that the asphalt mixture with adhesion promoters have better overall performance than the control mixture.

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Assessment Mixing and Compaction Temperatures for Modified HMA Using Superpave High Shear Viscosity Methods

Al-Nahrain Journal for Engineering Sciences ◽

10.29194/njes.21040516 ◽

2018 ◽

Vol 21 (4) ◽

pp. 516-522 ◽

Cited By ~ 3

Author(s):

Alaa Hussein Abed ◽

Ali Hwaidi Nasser

Keyword(s):

Shear Viscosity ◽

Asphalt Mixture ◽

High Shear ◽

Compaction Temperature ◽

Modified Asphalt ◽

Performance Grade ◽

Modified Binders ◽

Different Temperatures ◽

Marshall Stability

The objective of this study is determining the mixing and compaction temperature of the modified asphalt mixture. Results of binder tests showed that the addition of 3% SBS to control asphalt (PG 64-16) would achieve the desired performance level (PG 76-16) a performance grade that fits our climate with traffic loads. When using 5% SBS the performance grade of binder increased three grades (PG 82-16) and when increasing SBS content to 8% the performance grade increased four grades (PG 88-16). At shear rate of 500 (s-1), the modified asphalt viscosity can be obtained at different temperatures and the viscosity temperature curve can be achieved. As a result, the mixing and compaction temperature of modified asphalt can be determined to reach 0.17 ± 0.02 Pa.s and 0.28 ± 0.03 Pa.s for mixing and compaction, respectively. It is noted that SBS modified reached a viscosity of 3 Pa.s when 8 % additive. Additive contents above these values may not be suitable for good workability and pump ability according to Superpave specifications. While addition of 5% SBS with control asphalt, more than 3.7times at 135°C Increase the viscosity. Marshall Stability test indicated that the strength for the SBS specimens increases as compared to the conventional specimens. An increase of about 39%, 74%, 102%, was observed with 3%SBS 5%SBS 8%SBS modified binders, respectively. The Marshall test results for 8%SBS binders required compaction temperatures above 175°C need to keep up quality of HMA item while limiting natural effect amid development, these proposals are unsatisfactory Modified mixtures the 5% SBS modification was determined to be the maximum useful content. The Superpave method to estimate mixing and compaction temperatures show are not practical for use with modified binders. Also, it is observed that good agreement values between the average Marshall compaction temperature and the High Shear Viscosity Method (HSRV) and lower than Superpave methods Where the decline ranges from 15 ºC to 17 ºC.

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