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Evaluation of Workability and Mechanical Properties of Stone Matrix Asphalt Mixtures Made With and Without Stabilizing Additives

  • G. Shiva KumarEmail author
  • A. U. Ravi Shankar
Technical Paper
  • 16 Downloads

Abstract

Stone matrix asphalt (SMA) is a gap-graded mixture which is the combination of higher concentration of coarse aggregate and binder mortar. The coarse aggregate skeleton provides the mixture with stone-on-stone contact, giving it strength, while the high binder content mortar adds durability. The mortar is typically composed of fine aggregate, mineral filler, binder, and a stabilizing additive. A stabilizing additive such as cellulose fibers, mineral fibers, or polymers is added to SMA mixtures to prevent draindown of the mastics. In addition, it has the potential of reinforcing and improving the tensile strength of SMA mixtures. This paper presents the findings of performance of SMA mixtures with and without stabilizing additive. Superpave mix design, draindown, fatigue, rutting, workability, and moisture-induced damage properties of the SMA mixtures was evaluated. Three types of stabilizing additives (B, S, and V), one nominal maximum aggregate size (NMAS) 13.0 mm, and an unmodified asphalt binder (VG-30) were used in the study. Results indicate that the addition of stabilizing additive controls binder draindown and mix design properties of SMA mixtures satisfies the IRC SP 79 requirements. Resistance to rutting, fatigue, and moisture-induced damage of SMA with stabilizing additives were higher than SMA mixture without stabilizing additive. Further, SMA mixture without stabilizing additive takes less energy for densification compared with SMA mixture with stabilizing additives.

Keywords

Stone matrix asphalt Stabilizing aditives Workability Moisture-induced damage Rutting Fatigue 

Abbreviations

AASHTO

American Association of State Highway and Transportation Officials

ASTM

American Society for Testing and Materials

CDI

Compaction density index

Gmb

Bulk specific gravity of compacted mix

Gmm

Theoretical maximum density of mixture

HMA

Hot mix asphalt

IRC

Indian Roads Congress

IS

Indian Standard

ITS

Indirect tensile strength

MS-02

Asphalt Institute Manual, Series No. 2

MoRTH

Ministry of Road Transport and Highways

Ndes

Number of design gyrations

NMAS

Nominal maximum aggregate size

OBC

Optimum bitumen content

SGC

Superpave gyratory compactor

SMA

Stone matrix asphalt

SP-02

Superpave Manual, Series No. 2

STOA

Short-term oven aging for 2 h

TDI

Traffic density index

TSR

Tensile strength ratio

VTM

Voids in total mix

VFB

Voids filled with bitumen

VMA

Voids in mineral aggregate

Notes

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019
corrected publication 2019

Authors and Affiliations

  1. 1.Department of Civil and Industrial EngineeringUniversity of PisaPisaItaly
  2. 2.Dept. of Civil EngineeringNational Institute of Technology KarnatakaMangaloreIndia

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