P.K. Jain

Significance of RAP Content and Foamed Binder Content on MechanisticCharacteristics of Recycled Foamed Bituminous Mixes

To reduce the energy consumption and CO2 emissions during asphalt production, several environmentally friendly technologies have been developed during the last years. One of these technologies is the cold recycling by using foamed bitumen. Foaming the bitumen reduces the binder viscosity temporarily and increases the volume as well. Homogenous foams are produced by injection of cold water into hot bitumen. The paper presents the results of laboratory testing of the physical and mechanical parameters of the recycled mixes using the foamed bitumen and resistance to the action of water. The aim of the tests was to evaluate the properties of the mixes in terms of the RAP Content and Foam Binder Content. To evaluate the significance of impact of both factors i.e., Foam Binder Content and RAP Content on the distribution of the analyzed parameters, two-way Analysis of Variance (ANOVA) was performed. ANOVA Analysis results suggest that the RAP in cold mixes is not completely acting as black rock implying that some portion of the residual aged binder is possibly rejuvenated or softened by adding new binders.

Effect of SBS and HDPH polymer on rheological properties of asphalt

ABSTRACT The present work discusses the combined effect of High Density Polyethylene Homo polymer and Styrene-Butadiene-Styrene on properties of Viscosity Grade 30 asphalt commonly used in India. Six blends of binders were prepared using varying percentages of both polymers and were evaluated for rheological properties. Use of both polymers leads to higher viscosity, while blending with HDPH polymer only leads to marginal increase in viscosity when compared to unmodified binder. Comparison of dynamic modulus and phase angle master curves indicated, significant differences were found among master curves obtained with different aging conditions when compared to unaged condition especially at lower reduced frequencies.

Effect of Vacuum Residue on Rheological Properties of Low Viscosity Bituminous Binders for Road Construction

In this paper effects of different dosage of a typical vacuum residue (VR) on rheological properties of low viscosity bituminous binder are investigated. Detailed rheological studies were performed using Dynamic Shear Rheometer (DSR). Four approaches were used to investigate the temperature susceptibility of binders. Temperature susceptibility decreases with increase in VR percentage in VG10 showing high penetration index (PI), low viscosity-temperature susceptibility (VTS) and high penetration-viscosity number (PVN). Isochronal and isothermal graphs are plotted for different blends. From this study, it has been concluded that with the incorporation of VR in VG10, resistance to rutting in bituminous roads increases. VR modified bitumen shall perform better in high tempertaure climate.