Resilien Modulus Asphalt Testing Sysytem
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Resilien Modulus Asphalt Testing Sysytem
Short Discription :
The resilient modulus (Mr) is a critical material property in pavement engineering that measures the stiffness of asphalt concrete (also known as hot mix asphalt or HMA) under repeated loading conditions, simulating traffic loads. It represents the recoverable (elastic) deformation response of the material after unloading, analogous to Young’s modulus in linear elastic models. This parameter is essential for predicting pavement performance, including fatigue cracking, rutting, and overall structural capacity, and is incorporated into design guides like the 1986 AASHTO Guide for Design of Pavement Structures.
Standard Following :
AASHTO T307, ASTM D7369, AASHTO T307
Brochure:
Resilient modulus testing supports mechanistic-empirical pavement design by providing data for layer stiffness, structural coefficients, and performance predictions under varying moisture, temperature, and stress conditions. It’s used in systems like the Asphalt Aggregate Mixture Analysis System (AAMAS) to evaluate mixture design, fatigue life, and field corroboration via nondestructive testing. No significant differences in Mr Computation arise from loading systems (pneumatic vs. hydraulic), but sample size and recovery time influence results, with coefficients of variation up to 20-30% in coarser mixes.
TESTING SYSTEMS AND EQUIPMENT
Commercial systems automate these tests under triaxial conditions, often with closed-loop control for axial load/displacement and confining pressure. Examples include
KEY FEATURES | SPECIMEN SIZES | TEMPERATURE CONTROL |
Computer-controlled software with AASHTO/SHRP sequences, real-time Mr calculation, dynamic waveforms (up to 50 Hz), optional environmental chamber (-30°C to +150°C). Supports indirect tension and dynamic modulus fixtures. | 2.8″, 4″, 6″ diameter | Yes, with liquid N2 boost |
Measures recoverable axial deformation for subgrade/base/asphalt under repeated loading | Varies (triaxial cells) | Optional |
Tests permanent deformation and Mr of unbound/asphalt materials; quiet operation under high pressure/temperature. | Up to 150 mm | Yes |
Automated for permanent deformation and Mr of soil/aggregate/asphalt; user-defined protocols. | Standard triaxial | Optional |
Triaxial setup without loading frame; high-pressure/high-temp capable. | Varies | Yes |
These systems use electro-hydraulic or pneumatic servo control, external/internal transducers, and export data for model fitting.
For implementation, consult ASTM D7369 for bituminous mixtures or AASHTO T307 for aggregates/soils, adaptable to asphalt.
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