Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat

2018 ◽  
Author(s):  
Louay N. Mohammad ◽  
Mostafa A. Elseifi ◽  
Ramendra Das ◽  
Wei Cao ◽  
◽  
...  
Keyword(s):  
Shear Strength ◽  
Strength Test ◽  
Shear Strength Test ◽  
Interlayer Shear ◽  
Tack Coat ◽  
Interlayer Shear Strength

Validation of the Louisiana Interlayer Shear Strength Test for Tack Coat

2018 ◽  
Author(s):  
Louay N. Mohammad ◽  
Mostafa A. Elseifi ◽  
Ramendra Das ◽  
Wei Cao ◽  
◽  
...  
Keyword(s):  
Shear Strength ◽  
Strength Test ◽  
Shear Strength Test ◽  
Interlayer Shear ◽  
Tack Coat ◽  
Interlayer Shear Strength

Factors Affecting the Interlayer Shear Strength of Laboratory and Field Samples

2020 ◽  
pp. 036119812097541
Author(s):  
Abu Ahmed Sufian ◽  
Dan Swiertz ◽  
Hussain U. Bahia ◽  
Louay Mohammad ◽  
Moses Akentuna
Keyword(s):  
Shear Strength ◽  
Field Study ◽  
Laboratory Study ◽  
Application Rate ◽  
Study Phase ◽  
Asphalt Emulsion ◽  
Interlayer Shear ◽  
Field Samples ◽  
Tack Coat ◽  
Interlayer Shear Strength

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.

Direct shear strength test on rocks along discontinuities, under laboratory conditions

2014 ◽  
Vol 9 (3) ◽  
pp. 139-150 ◽  
Author(s):  
Ildikó Buocz ◽  
Nikoletta Rozgonyi-Boissinot ◽  
Ákos Török ◽  
Péter Görög
Keyword(s):  
Shear Strength ◽  
Strength Test ◽  
Direct Shear ◽  
Shear Strength Test ◽  
Laboratory Conditions

Research on the Package of High Voltage SiC JBS

2015 ◽  
Vol 713-715 ◽  
pp. 1038-1041
Author(s):  
Gang Chen ◽  
Ya Nan Li ◽  
Lin Wang ◽  
Ao Liu ◽  
Song Bai ◽  
...  
Keyword(s):  
Shear Strength ◽  
High Voltage ◽  
Wire Bonding ◽  
Strength Test ◽  
Strength Measurement ◽  
Shear Strength Test ◽  
Materials Used

According to the application of the high voltage SiC devices, studying the package of three kinds of SiC dies with different metals. Experiments show that all die wire bonding and shear strength measurement up to standard, and provide three kinds of packages for different applications, at the same time, filling the needs of producing. The purpose of the shear strength test is to determine the integrity of materials used to attach SiC die to package substrates.

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