The interest in rejuvenators has been growing rapidly the past few years due to their ability restore aged binders unaged state and availability of recycled materials. introduction made it possible produce asphalt mixes with high pavement (RAP) content. Typically need be added RAP bitumen dosages, more than 10%, achieve desired effect. In this work a new soybean-derived additive is introduced as rejuvenator, at 0.75% by weight bitumen. effect adding rejuvenator on rheological properties both...

Rejuvenators are used to restore the properties of reclaimed asphalt pavement (RAP) binders through readjusting balance between asphaltene and maltene fractions. To properly understand effect rejuvenators, it is important analyze chemical changes in rejuvenated relate these rheological binders. In this study, RAP were blended with a bio-based an aromatic extract petroleum-based rejuvenator additive. Chemical thermal techniques, such as differential scanning calorimetry (DSC), attenuated...

Abstract The aging of asphalt concrete is mainly governed by the binder, which a naturally occurring organic hydrocarbon. Both chemical and rheological properties binder are expected to change as continues. pavement industry increasing use different recycled materials in construction rehabilitation flexible pavements preserve natural resources, save costs, reduce environmental emissions. aged from alter its characteristics new mix. In this study, 3 virgin base types (PG 64-16, PG 58-22,...

Rejuvenators are primarily added to aged binders restore their properties by lowering stiffness and improving stress relaxation. The type of interaction that takes place between the rejuvenator binder is still under extensive study. This research aims at investigating extent which performance grade (PG) source original affect a soybean-derived rejuvenator. was dosage 6% 12% weight three distinctly different binders, namely PG58-28 binder, an extracted reclaimed asphalt pavement (RAP)...

The performance of carbon nanotubes (CNTs) in cement-based composites relies to a great extent on its degree dispersion. In this work, the two commonly used surfactants; sodium dodecyl sulfate (SDS) and Triton X-100, is being compared. effect surfactant-to-CNT ratio dispersion efficiency studied using ultraviolet-visible (UV-Vis) spectrometry, determine optimum surfactant dosage. For ultrasonication energy, Raman spectroscopy assess imperfections CNTs. CNTs-reinforced mortar specimens...

The use of rejuvenators in mixes with high reclaimed asphalt pavement (RAP) content is becoming common practice. Rejuvenators are added to containing RAP reduce the stiffness binders and improve their low temperature properties hence allowing for higher amounts be included mix. For utilising more than 25% RAP, blending charts often used determine proportions virgin based on respective performance grades. Introducing into blend changes overall physical blend, need assess validity when...

A laboratory study was conducted to determine the optimum dosage of a bio-based rejuvenator, epoxidised methyl soyate (EMS), needed obtain mix design containing 30% unfractionated recycled asphalt pavement (RAP) using neat binder with performance grade (PG) 58-28S, rated for standard traffic meet criteria PG 58-28S. Based on running comprehensive rheological characterisation Superpave criteria, 3% EMS by weight 58-28S at proportions (75.5% w/ EMS, and 24.5% RAP extracted binder). The is...

Rejuvenators are added to reclaimed asphalt pavement (RAP) binders enhance their low-temperature and fatigue performance. The effectiveness of a rejuvenator depends upon many factors, including the properties as well compatibility between base binder. thermal can vary greatly based on its chemical composition. This research focuses understanding effects rejuvenators rheological rejuvenated binders, particularly in relation critical low temperature. In this research, an extracted recovered...

Abstract Binder film thickness (BFT) plays a vital role during the design of asphalt mixture and fine aggregate matrix because BFT can exert significant effect on performance materials. However, surface area factors are affected by different specific gravities aggregates, which always ignored calculation BFT. Moreover, whether is uniformly distributed in controversial. Hence, it necessary to further study distribution materials its influence factor. This analyzed coarse parts recycled...

Binder blending charts are used to determine the selection of virgin binder grade asphalt mixes containing more than 25% reclaimed pavement (RAP) as part Superpave volumetric mix design procedures. However, extraction and recovery RAP process is expensive, hazardous, poses potential threats human health environment due solvents used. An alternative two-phase approach was developed in this study that uses fine aggregate matrix (FAM) testing with help predictive models. The first phase model...

Abstract Dynamic modulus testing and the development of master curves is an essential test used to characterize asphalt mixes. The dynamic values are in mechanisitic-emprical pavement design guide that being implemented by many state agencies. To compare values, most researchers use analyze values; however, log-log scale curve masks differences between mixes, requiring appropriate reliable statistical data analysis approach make accurate comparisons In this paper, a full experimental plan...

California has a diverse climate that ranges from desert regions with some of the hottest places in North America to coastal mild climates and cold summers. The selection binder's performance grade (PG) is based on map was developed 2005 using 1960 1990 data National Climate Data Center (NCDC) analyzed Enhanced Integrated Model (EICM) Long-Term Pavement Performance (LTPPBind 2.0) software. change happening all around world, no exception. Based observed pavement performance, there need revise...

Cementitious-based strain sensors can be used as robust monitoring systems for civil engineering applications, such road pavements and historic structures. To enable large-scale deployments, the fillers in creating a conductive material must inexpensive easy to mix homogeneously. Carbon black (CB) particles constitute promising filler due their low cost ease of dispersion. However, relatively high quantity these needs mixed with cement order reach percolation threshold. Such level may...

A number of predictive models, such as the Hirsch and Al-Khateeb have been proposed to determine properties asphalt binders from concrete mix testing results. Fine aggregate matrix (FAM) can also provide useful insights into likely performance mixes. Consequently, FAM be an appropriate means assessing power these models. In this study, mixes prepared with two virgin binders, PG58-28 PG64-16, then different percentages reclaimed pavement (RAP) were tested their stiffness phase angle using...

In this study, the fatigue performance of asphalt mixtures with high reclaimed pavement (RAP) content and rejuvenating agents (RA) has been investigated at level fine aggregate matrix (FAM) mix. Fatigue tests were conducted on four mixes: FAM without RAP, 25% RAP binder replacement, two types rejuvenators. Both linear amplitude sweep (LAS) conventional time testing used. The comparison between mixes indicated that addition results in a higher stiffness faster damage rate as expected. Adding...