Effect of tack coat application on interlayer shear strength of asphalt pavement: A state-of-the-art review based on application in the United States

Asphalt emulsion is the most widely used tack coat material in the U.S. The objective of this study is to investigate factors that may affect the interlayer bond shear strength of asphalt emulsion tack coats of both laboratory and field compacted samples. The laboratory study included six types of tack coat materials applied on two surfaces with two residual application rates. The field study phase involved validation of the interlayer shear performance findings using field cores extracted from paving projects. The field study included taking cores of the existing layer, emulsions used for interlayer bonding, and loose mixes of new asphalt layers. Materials were collected to produce the laboratory prepared specimens for comparison with the field cores. Results of the laboratory study demonstrate that there is a direct relationship between the roughness (texture) of the existing surface and the interlayer shear strength (ISS) between two surfaces. Statistical analysis provided a strong correlation and indicated that 79% of the data variance can be explained with surface texture, emulsion type, application rate, and replicate effects. Comparing field cores with laboratory produced samples showed no clear relationship between the shear strength of laboratory and field specimens. It is speculated that the difference in compaction of the upper layers in the laboratory and field, and effect of shearing during coring of the samples from the field, resulted in higher laboratory shear values relative to field core values. The study highlights major challenges in using laboratory prepared samples to predict field behavior of tack coats.

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Method to Predict Interlayer Shear Strength of Asphalt Pavement Based Upon Improved Back Propagation Neural Network

SSRN Electronic Journal ◽

10.2139/ssrn.4000496 ◽

2022 ◽

Author(s):

Tengfei Nian ◽

Jinggao Li ◽

Ping Li ◽

Rui Guo ◽

Jinguo Ge ◽

...

Keyword(s):

Neural Network ◽

Shear Strength ◽

Asphalt Pavement ◽

Back Propagation ◽

Back Propagation Neural Network ◽

Interlayer Shear ◽

Interlayer Shear Strength

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Effect of tack coat emulsion type, application rate, and surface type and texture on early-age interlayer shear strength of pavements in cold regions

International Journal of Pavement Engineering ◽

10.1080/10298436.2020.1828587 ◽

2020 ◽

pp. 1-16

Author(s):

Rouzbeh Ghabchi ◽

Chamika Prashan Dharmarathna

Keyword(s):

Shear Strength ◽

Application Rate ◽

Early Age ◽

Surface Type ◽

Cold Regions ◽

Interlayer Shear ◽

Tack Coat ◽

Interlayer Shear Strength

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An Empirical Review of the Design and Performance of Icebreakers

Marine Technology and SNAME News ◽

10.5957/mt1.1989.26.2.145 ◽

1989 ◽

Vol 26 (02) ◽

pp. 145-159

Author(s):

R. A. Dick ◽

J. E. Laframboise

Keyword(s):

United States ◽

Soviet Union ◽

State Of The Art ◽

The United States ◽

West Germany ◽

The United Kingdom ◽

The Soviet Union ◽

And Performance ◽

Ship Performance ◽

Selection Of

This paper utilizes available data on existing icebreaking ships to compile a review of the design features that influence ship performance. The data were extracted from a recently completed review of the state of the art of Arctic ship technology and include icebreaking ships from Argentina, Canada, Denmark, Finland, Japan, Sweden, the United Kingdom, the Soviet Union, the United States, and West Germany. It is the aim of this paper to offer guidance in the initial stages of icebreaker design and thereby give confidence to the designer in the selection of dimensions, hull shape and propulsion.

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