The effects of using different bitumen modifiers and hydrated lime together on the properties of hot mix asphalts

Abstract

In this study, the effects of styrene-butadiene-styrene (SBS), American gilsonite (AG) and Iranian gilsonite (IG) usage in bitumen modification, and hydrated lime usage in mixture modification on the performance of hot mix asphalts (HMAs) were investigated. For bitumen modification, 4.0% SBS, 11.0% AG and 10.0% IG were used with respect to bitumen weight. Hydrated lime was used as filler in proportion of 2% with respect to aggregate weight. It was determined that the high temperature properties of bituminous binders were improved with bitumen additive usage. Marshall stability and flow, resistance to moisture-induced damage, indirect tensile stiffness modulus and wheel-tracking tests were applied to the mixtures. The mixture experiments revealed that both HMAs stability and stiffness and also resistance to moisture damage and wheel tracking were increased by hydrated lime and binder additives usage. It was observed that the hydrated lime was not as effective as the binder additives and the most effective additive was usually AG in terms of stability, stiffness and wheel tracking. It was detected that the SBS was the most effective additive for resistance to moisture-induced damage.

Determination of Resistance to Creep Permanent Deformation of Hot Mix Asphalts Prepared with Various Additives

“…In a previous study conducted, the effects of additives and lime use on rutting formation were investigated by using the wheel tracking test method [23]. The results obtained in this study were found to be similar to the results of the previous study, indicating that the most effective additive in terms of resistance to permanent deformation is AG, while the least effective one is SBS and lime use is not as effective as the additive use.…”

“…DSR and bending beam rheometer (BBR) test results of neat and modified bitumens are presented in Table 1. As seen in Table 2, the modified bitumen performance level is PG 70-22, which meets the necessary level for the area of application [23]. Viscosity values were increased due to use of additives, which in turn increased the mixing and compaction temperatures.…”

“…In a study conducted by Yılmaz and Yalçın, 2% hydrated lime was used as filler and SBS, AG and IG was used in the bitumen modification. As a result of the study, it has been reported that all of the additives improve the Marshall stability, resistance to moisture damage, stiffness and resistance to rutting [23]. In another study conducted with the same materials, it has been determined that the additives improve the fatigue lives of HMAs [24].…”

Relationship between microscopic analysis and quantitative and qualitative indicators of moisture susceptibility evaluation of warm-mix asphalt mixtures containing modifiers

“…The application of modified bitumen can reduce stripping. In addition to impacts on the bond between aggregate and bitumen, anti-stripping materials can change the hardness and rutting resistance and increase or decrease the propagation of cracks [5]. On the other hand, the image processing of asphalt mixture specimens was first conducted for a project entitled "thermography image processing in an asphalt core" in 1993 at the University of Southern California.…”

Low temperature properties of hot mix asphalts prepared with different polymer modified binders

“…Otherwise cracking may cause very serious problems, such as poor ride quality, reduced service life, and high maintenance costs [5]. Polymeric materials can be used as modifiers in bitumen and hot mix asphalt (HMA) mixtures so that a wider performance range can be achieved [6][7][8]. When plastomers are incorporated into bitumen, the resultant structure is a rigid three dimensional network that resists deformation.…”