Asphalt und Bitumen

Type 3909

This model was designed for measuring axial displacements in the simple performance tests prescribed by NCHRP Report 465.

for Simple Performance Testing of Asphalt

These extensometers come as two axial modules with independent outputs capable of measuring specimen deformations in two locations. They clip quickly onto gage points mounted per the test requirements. Two, three or four modules can be mounted on the test specimen.Magnets at each end of the extensometer snap instantly in place on the steel gage points glued to the test sample. The quick attachment is most advantageous when testing preconditioned samples that are heated or cooled, since the extensometers can be mounted before the sample changes temperature appreciably. For units intended to be used inside triaxial cells, extensometers are available with modules rotated 90° (not shown). The standard Model 3909 has full scale travel of 0.5 mm. Gage points are included with the extensometers and optional gluing fixtures are available. The standard version of this model can be converted to the Model 3910 with optional gage length adapters.

Type 3910

This model meets many of the needs for testing asphalt core samples 100 and 150 mm (4 and 6 inch) diameters. The unit meets test method requirements of AASHTO TP9. These extensometers are single integral, bi-axial units which measure both lateral and vertical deformations.

for Creep Compliance and Tensile Strength Testing of Asphalt

They clip quickly onto gage points mounted per the test requirements. They mount much faster and easier than other types. Two units are typically required, with one extensometer mounting to each side of the test specimen. They are changeable from the 25 mm centers used for 100 mm diameter specimens, to the 38 mm centers used for 150 mm diameter samples using optional gage length adapters. Magnets at each end of the extensometer snap instantly in place on the steel gage points glued to the test sample. The quick attachment is most advantageous when testing pre-conditioned samples that are heated or cooled, since the extensometers can be mounted before the sample changes temperature appreciably. These Extensometer having full scale measuring range of 0.5 mm (0.020 inches). Gage points are included with the extensometers and optional gluing templates are available. Use with w+b Indirect Tensile Test Device Series ITJ. This model can be converted (with optional gage length adapters) to the model 3909, a axial extensometer for Simple Performance Testing of Asphalt prescribed by NCHRP Report 465.

Type 3911

This model meets many of the needs for testing asphalt core samples, in 100 and 150 mm diameters. It meets test method requirements for strain measurement developed under the U.S. Federal Highways SHRP program.

for Indirect Tensile Testing of Asphalt

For indirect tensile testing, such as for resilient modulus, these extensometers measure the lateral deformation of specimens. They are self supporting on the sample and clip on in seconds. The traditional way this deformation has been measured was prone to errors caused by slight rocking of the sample as it is loaded. The self supporting design of this extensometer eliminates this problem. This unit will handle the dynamic pulse requirements of resilient modulus testing. The speed of mounting makes test set-up much faster than with the older method. The pivot mounting used ensures that the specimen contact pads meet the often uneven asphalt surface as well as possible. The standard measuring range of 0.050 inches allows a wide range of testing, yet can easily measure the sometimes very small displacements required.

Type 3975

for Diametral Asphalt Testing

This extensometer was designed for accurate measurement of small diametral strains such as those required to determine Poisson’s ratio of rock, concrete and asphalt samples. The units are designed to be used in conjunction with the Model 3542RA axial averaging extensometer. Self-supporting on the test sample, these extensometers will work on standard sized diameter samples, but special configurations are available upon request. They are designed for use in testing for Poisson’s ratio and for applications where accurate diametral measurements with low strains are required. The Model 3975 is the best choice for small diametral strains in large compression samples. The circumferential extensometer, the Model 3544, is recommended for large strain measurements. These units are easily attached to the sample, and rounded contact edges maintain the position on the specimen.

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