Bitumen Rheological and Chemical Investigation

2021 ◽  
Vol 891 ◽  
pp. 190-195
Author(s):  
Li Xing Ma
Keyword(s):  
Rheological Properties ◽  
Thermal Load ◽  
Traffic Volume ◽  
Chemical Investigation ◽  
Bending Beam Rheometer ◽  
Volume Number ◽  
Cracking Behavior ◽  
Field Behavior ◽  
Actual Field ◽  
Pavement Temperature

This paper is to study the mechanism of aging on the Rheological and Chemical Investigation of the bitumen and make correlations with the actual field behavior of the binder. The effects of ageing on rheological properties of asphalt has been studied by Bending Beam Rheometer(BBR). The objective of conducting these tests is to evaluate the performance of the bitumen in an aged and unaged states in relation to the effects of traffic speed and/or pavement temperature, traffic volume (number of load repetitions), and (thermal/load) cracking behavior.

Effect of Ageing on Rheological Properties of Asphalt

2021 ◽  
Vol 891 ◽  
pp. 185-189
Author(s):  
Li Xing Ma
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Complex Modulus ◽  
Dynamic Shear ◽  
Dynamic Shear Rheometer ◽  
Field Behavior ◽  
Aged Asphalt ◽  
Actual Field

This paper is to study the mechanism of aging on the rheological properties of the asphalt and make correlations with the actual field behavior of the binder. The effects of ageing on rheological properties of asphalt has been studied by Dynamic Shear Rheometer(DSR). Significant differences of rheological properties and composition were observed between fresh and aged asphalt. The results show that aging at low temperature increases the complex modulus of asphalt, but has little effect at high temperature.

scholarly journals Silane Modification of Crumb Rubber on the Rheological Properties of Rubberized Asphalt

2019 ◽  
Vol 9 (22) ◽  
pp. 4831
Author(s):  
Yunbao Zhang ◽  
Zhaohui Liu ◽  
Juan Peng
Keyword(s):  
Rheological Properties ◽  
Surface Area ◽  
Stable State ◽  
Crumb Rubber ◽  
Area Measurement ◽  
Bending Beam Rheometer ◽  
Rubber Surface ◽  
Surface Area Measurement ◽  
Silane Modification ◽  
Formation Of Cracks

Because there is a lack of studies on rubberized asphalt based on silane coupling agent modification, KH-550 modified crumb rubber and rubberized asphalts incorporating normal rubber and modified rubber were prepared, respectively. The rheological properties of asphalt samples were evaluated by a dynamic shearing rheometer and a bending beam rheometer; then, mechanisms of KH-550 on rubber surface and functional group changes were analyzed by a Brunauer–Emmett–Teller specific surface area measurement and a Fourier transform infrared spectroscopy. The results imply that: (i) rubber surface area rises and chemical reactions accrue between rubber and asphalt; (ii) modified rubber achieves a more stable state within asphalt, which helps to enhance the mechanical properties of asphalt; (iii) modified rubber helps asphalt to dissipate stress so as to resist the formation of cracks and deformation under low temperature conditions.

Impact of Traffic Volume on Pavement Macrotexture and Skid Resistance Long-Term Performance

2019 ◽  
Vol 2673 (2) ◽  
pp. 314-322 ◽  
Author(s):  
Christina Plati ◽  
Maria Pomoni
Keyword(s):  
Field Measurements ◽  
Surface Characteristics ◽  
Traffic Volume ◽  
Skid Resistance ◽  
Pavement Maintenance ◽  
Actual Field ◽  
Volume Characteristics ◽  
Long Term Performance ◽  
Term Performance

Pavement skid resistance is influenced by both pavement macrotexture and microtexture, with the two components providing the skid resistance properties required to assist in ensuring road safety. In addition to these factors the cumulative traffic along a pavement is a known determinant factor influencing pavement surface characteristics leading to deterioration. However, previous research efforts in this area have been evaluated based on laboratory experiments that have not proven to be easily extrapolated to represent field conditions. With this in mind, the present study aims to investigate and comprehend the long-term effect of cumulative traffic on both skid resistance and macrotexture evolution based on actual field measurements. The ultimate research goal is to develop a practical approach for analysis and interpretation of in-situ performance characteristics that could be utilized by road agencies in evaluating long-term skid resistance performance. For the investigation, an 11-year field dataset consisting of three categories of pavement sections defined by their traffic volume/characteristics and geometric design was analyzed. The analysis results showed that skid resistance and macrotexture can be separated into two defined zones during their evolution, which are determinant for the remainder of the pavement service-life. In addition, the varying characteristics of the three investigated cases were presented and a sensitivity analysis performed. Overall, knowledge gained from understanding the long-term field pavement performance can provide valuable information to road agencies for on-time pavement maintenance actions that can help ensure pavement sustainability.

scholarly journals PREDICTION OF DEPTH TEMPERATURE OF ASPHALT LAYERS IN HOT CLIMATE AREA

2018 ◽  
Vol 24 (7) ◽  
pp. 516-525 ◽  
Author(s):  
Nader Solatifar ◽  
Mojtaba Abbasghorbani ◽  
Amir Kavussi ◽  
Henrikas Sivilevičius
Keyword(s):  
Linear Regression Analysis ◽  
Field Measurements ◽  
Falling Weight Deflectometer ◽  
Actual Measurement ◽  
Temperature Variations ◽  
Hot Climate ◽  
Actual Field ◽  
Pavement Temperature ◽  
Falling Weight

In determination of flexible pavement layers moduli using Falling Weight Deflectometer (FWD), the pavement depth temperature should be determined and then the moduli should be corrected into a reference temperature. As direct measurement of pavement temperature is time consuming and is difficult to be determined in trafficked roads, some models are developed to predict temperature of asphalt layers through pavement depth, including BELLS model. The objective of this research is to determine correlation between actual measurement and prediction of temperature variations through asphalt layers with applying BELLS model. Ten new and rehabilitated pavement sites were selected in hot climate regions in Khuzestan and Kerman provinces in southern part of Iran. In typical hot summer days, pavement temperatures were measured at half and at one-third of the depth of asphalt layers and FWD testing were performed. Results indicated that a linear regression analysis of BELLS predicted temperatures versus measured values, provides very good correlation with actual field measurements of temperatures through the asphalt layers. Furthermore, predictions were more precise in rehabilitated pavements rather than in newly constructed pavements. Finally, using multi parametric linear fitting analysis, a new model was developed to accurately predict the temperature of asphalt layers in new pavements.

Chemical investigation of winter fireflies (Ellychnia corrusca) reveals lucibufagins

Planta Medica ◽  
2015 ◽  
Vol 81 (11) ◽  
Author(s):  
CF Mosey ◽  
M Gaber ◽  
ZB Ahmed ◽  
RG Risteen ◽  
SR Smedley ◽  
...  
Keyword(s):  
Chemical Investigation

Chemical Investigation of Opuntia tuna Mill growing in Egypt

Planta Medica ◽  
2007 ◽  
Vol 73 (09) ◽  
Author(s):  
WA Tawfik ◽  
AA Shahat ◽  
NM Hassan ◽  
NS Abdelazim ◽  
SI Isma ◽  
...  
Keyword(s):  
Chemical Investigation
Sign in / Sign up

Export Citation Format

Share Document