Asphalt Binder Mix Testing

Binder, Mix Testing Binder, Mix Testing

Binder, Mix Testing

Asphalt binder and mix testing is critical in developing durable mixtures that combat the ever-increasing stress traffic places on our roads, climate and other factors. more »

Binder, Mix Testing, continued

New and improved technologies developed since the 1980s are available for developing preparation and tests to properly assess the durability, strength and characteristics of asphalt binders.

Gyratory compactors are used to simulate and reproduce the real compaction conditions of actual road paving operations in determining the compaction properties of asphalt. Hamburg (Immersion) wheel tracking test is used to evaluate the resistance to rutting and moisture susceptibility of asphalt mixtures. The Rolling Thin Film Oven is used to measure the effect of heat and air on semi-solid asphaltic material and shows the approximate change in properties during conventional hot-mixing.

The bending beam rheometer (BBR) performs flexural tests on asphalt binder and similar specimens per tests, consisting of a constant force being applied to a specimen in a chilled fluid bath. Specific rates of deformation can then be measured at various temperatures. The pressure aging vessel (PAV3) is used to simulate in-service oxidative aging of asphalt binder according to procedures developed by the Strategic Highway Research Program (SHRP).

The vacuum degassing oven (VDO) is used to accurately de-gas pressure-aged binder samples and is designed for rapid removal of entrapped air bubbles in asphalt specimens to the required specifications.

In recent years many mixture design methods have produced materials that are stiffer, leaner and more resistant to rutting. However, such materials are often more susceptible to fatigue and reflection cracking. The Texas Overlay Tester (CS-TOT) was designed to simulate the expansion and contraction movements that occur around joints or cracks and which result in reflection cracking in overlays. With the CS-TOT it is possible to characterize both the crack initiation and crack propagation properties of asphalt mixtures.

Roller compactors are the method of laboratory specimen compaction that results in slabs of asphaltic paving materials with properties that closely simulate those of materials in the highway. Slabs can be compacted to target mixture densities using loads that are equivalent to those of full-scale compaction equipment.

The rotational viscometer and rheometer provide an excellent solution for SHRP asphalt binder testing equipment specifically designed to meet the requirements of AASHTO T316/ASTM D4402 high-temperature test methods.

Heavy duty lab bench ovens are capable of maintaining 437°F (225°C), more than adequate for both short-term aging of asphalt samples and heating aggregates, asphalt binders and equipment for use in ASTM D6925. The hydraulic bending beam machines use advanced servo-hydraulic technology and a high-speed digital data acquisition and control system.

Humboldt offers a complete selection of quality and durable tools for asphalt binder and mix assessment testing for super pave mixes. If you have questions or need help selecting equipment, please call us at 1.800.544.7220 or use our Quick Response form.

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