Application of Pull-off Test for Evaluating Bond Strength Properties of Modified Bitumen Emulsions

Document Type : Research Article

Authors

1 M.Sc. in Highway and Transportation Engineering, Faculty of Civil and Environmental Eng., Tarbiat Modares University

2 Associate Prof., Highway and Transportation Eng., Faculty of Civil and Environmental Eng., Tarbiat Modares University

Abstract

Reduced adhesion properties between aggregate particles and bitumen binders, and reduced cohesion within the bitumen binders in asphalt mixes result in stripping and segregation distresses in road pavements. These will ultimately result in pothole formation and other severe distress in pavements. In this research, with the aim of determination of adhesion and cohesion properties between aggregate particles and bitumen binders, the pull-off testing method, which is commonly used in characterizing road marking materials, was used to determine tensile strength values that are created between aggregate particles and bitumen emulsions. Two conventional cationic bitumen emulsions of rapid and medium breaking types were used as control binders. These were then modified using a latex liquid additive at various percentages. Two aggregate types were used, namely granite and a dolomite type. Their mineralogy was determined using the XRF testing method. In addition, the role of other parameters, such as curing time and curing temperature, were determined too. Pull-off testing results showed that modification of bitumen emulsions with %3 latex provided increased adhesion properties and increased durability between bitumen emulsion and the two aggregate types that were selected in this research. It has also resulted that interaction between aggregate particles and the bitumen emulsions was great where latex modified bitumen emulsions were used. By comparing the role of the two aggregate types, it resulted that the dolomite aggregates provided superior adhesion properties. It was concluded that the role of curing time and temperature were dominant in providing adequate adhesion properties between bitumen emulsions and aggregate particles. The increase was more dominant in samples containing latex-modified bitumen emulsions.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 2
May 2022
Pages 631-648

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