The Influence of Biomass Masut and Emulsifier on Emulsified Bio-asphalt Performance (original) (raw)

A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts

Molecules, 2021

Transforming waste biomass materials into bio-oils in order to partially substitute petroleum asphalt can reduce environmental pollution and fossil energy consumption and has economic benefits. The characteristics of bio-oils and their utilization as additives of asphalts are the focus of this review. First, physicochemical properties of various bio-oils are characterized. Then, conventional, rheological, and chemical properties of bio-oil modified asphalt binders are synthetically reviewed, as well as road performance of bio-oil modified asphalt mixtures. Finally, performance optimization is discussed for bio-asphalt binders and mixtures. This review indicates that bio-oils are highly complex materials that contain various compounds. Moreover, bio-oils are source-depending materials for which its properties vary with different sources. Most bio-oils have a favorable stimulus upon the low temperature performance of asphalt binders and mixtures but exhibit a negative impact on their ...

Some Properties of Emulsified Asphalt Paving Mixture at Iraqi Environmental Conditions

2012

Cold emulsified asphalt mixture is generally a mix made of emulsified asphalt with aggregate. Emulsified asphalt is manufactured from base asphalt, emulsifier agent and water with approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to 60% water plus some minor components. This study aims to use the cold emulsified asphalt mixtures for road construction and maintenance in Iraq as an alternative to the hot asphalt mixtures, due to its economical, practical and environmental advantages. This studyfocused to test and evaluates the emulsified asphalt material properties to be used as paving mixture. The tested properties of emulsified asphalt mixture were bulk density, air voids, dry Marshall stability, wet Marshall stability, retained Marshall stability, flow tests and compared with the common used specification.The results indicate that the emulsified asphalt type cationic slow setting low viscosity (CSS-1) is very suitable with quartz type of aggregate from Al-Nibaay quarry. From many trial mixes it is found that the best percentages of initial residual bitumen content to produced adequateresults for coating test ,mixing ,compaction ,curing and Marshall stability were ranged from (2.5%, 3%,3.5%,4% and 4.5%), andthe optimum percentage is (3.5%).Finally it can be conducted that the emulsified asphalt mixture is a suitable alternative mixture to the hot asphalt mixture for road construction and maintenance in Iraq.

Converting Biomass into Bio-Asphalt – A Review

IOP Conference Series: Earth and Environmental Science, 2021

The partial substitution of bio-binder for petroleum asphalt binder is possible in the pavement application. Biomass commonly employed renewable energy origin is normally a raw substance used for the production of bio-binder, which includes palm oil, microalgae, soybean oil, vegetable oil, engine oil residue, grape remains, swine waste and many others. This review addresses the diverse bio-oils produced from different biomasses, followed by the properties of bio-oils and performance of bio-asphalt. This review also emphasises on the hydrothermal processing of biomass and the parameters affecting the quality and quantity of the yield for the use in asphalt. Notably, hydrothermal processing is a crucial thermochemical converting procedure employed on biomass into materials or biofuel. Following the aimed products, such as bio-gas, bio-oil, or bio-carbon, the variables selected during the operation (pressure, temperature, and time) is very critical. A notable impact has been placed in ...

Rheological Performance of Bio-Char Modified Asphalt with Different Particle Sizes

Applied Sciences, 2018

To improve the performance of petroleum asphalt, bio-char was used as a modifier for a petroleum asphalt binder, in this study. The rheological properties of bio-char modified asphalt binders were compared with different particle sizes and contents, with one control and one flake graphite modified asphalt binder. Specifically, the bio-char modifiers with two particle sizes (ranging from 75 μm–150 μm and less than 75 μm) and three contents of 2%, 4%, and 8% were added into the asphalt binder. A flake graphite powder with particle sizes less than 75 μm was used as a comparison modifier. The Scanning Electron Microscopy (SEM) image showed the porous structure and rough surface of bio-char as well as dense structure and smooth surface of flake graphite. A Rotational Viscosity (RV) test, Dynamic Shear Rheometer (DSR) test, aging test, and Bending Beam Rheometer (BBR) test were performed to evaluate the properties of bio-char modified asphalt in this study. Both modifiers could improve th...

Kinetic Properties of Emulsified Asphalts

2014

The effect of shear on the non-Newtonian viscosity of emulsified asphalts is presented. Measurement of the viscosity behavior of several emulsions by rotational viscometer, shows that the viscosity decreases under constant shear until an equilibrium viscosity is attained. A first-order kinetic model is used to analyze the viscosity data and to obtain rate constants for each emulsion. Based on their rate to attain an equilibrium viscosity, emulsions were ranked as follows: CRS-2R> CMS-2P> CRS-1P ~ CMS-2s> CRS-2> CRS-2P> HFRS-2> HFRS-2P. From the rate constants, relaxation times were obtained for each emulsion. Anionics had the longest relaxation times compared to the cationic emulsions. The steady-state viscosity ηss, initial viscosity ηo, and the viscosity η at any time were used to obtain the rate constants. The cationic emulsions attained their equilibrium viscosity at a faster rate that the anionics. This is attributed to the different type of interaction betwee...