Highway Sustainability Research Center - CENCollege of Engineering 

Hot-Mix Asphalt (HMA) Property & Performance Testing Equipment

IPC Simple Performance Test Device (SPT)

Features & Benefits

Closed loop servo-hydraulic test machine. This device was designed based on the requirements of NCHRP Project 9-29 "Simple Performance Tester for Superpave Mix Design". Testing results from device are used to evaluate the resistance of Hot Mix Asphalt (HMA) to permanent deformation and fatigue cracking. The models used to calculate and quantify the testing result were developed in NCHRP 9-19 "Superpave Support and Performance Models Management". Three test applications are completed with this device:

Flow Time Test
Flow Number Test
Dynamic Modulus Test (E*)

The dynamic modulus test (E*) is of great interest to many local, state and federal agencies as it will be a design requirement of the new AASHTO pavement design guide.
For more information, please visit IPC Global.

MTS with Environmental Chamber

Features & Benefits

Closed loop servo hydraulic Universal Testing Machine (UTM) with a bottom mounted actuator. This device is used for a variety of HMA testing procedures including:

Indirect Tensile Strength
Resilient Modulus
Creep Compliance

Many custom testing procedures can be designed and completed with this device since the software and control features are fully programmable. The attached environmental chamber provides flexibility to test at a wide variety of temperatures from -20°C to 60°C.
For more information, please visit MTS Systems Corporation.

Model Mobil Load Simulator (MMLS3)

Features & Benefits

The MMLS3 is an accelerated pavement testing device (shown on the right) that applied realistic trafficking to the pavement. The load is scaled but tire pressures are the same level as in full scale trucks. The device can be used to directly explore the performance of the upper 125 mm of asphalt pavements in the laboratory and in the field. Scaled down models of the pavement can also be tested to investigate the performance of the full pavement structure. The MMLS3 can characterize an asphalt mix and predict the performance with the following variables taken into account: load frequency, temperature, lateral wander of the load, and aging of material. The loading from the MMLS in uni-directional and the speed can be adjusted. Laboratory testing can be completed on gyratory specimens, field cores, or slabs. Numerous research has been conducted to validate the MMLS3 results to real trafficking data at the NCAT test track and the WesTrack facility.

The MMLS3 system is compromised of five main components: MMLS3 Loading Unit, Slab Compactor, Heating -Cooling Unit, Wet Pavement Heater, and a Profilimeter. The MMLS3 loading unit is described above. The slab compactor (shown on the left) has a vibratory drum roller for constructing slabs in the laboratory. These slabs can be constructed up to 3 feet wide by 9 feet long. Once construction is completed the MMLS3 load unit can be placed on top of the slab and tested (shown below on right).

The Heating-Cooling Unit and Wet Pavement Heater (not shown) are used to environmentally condition the prospective test specimen whether its a gyratory specimen, field core, or slab. These are used to simulate the field conditions of the pavement in the laboratory. Similarly these units can be used in the field.

The ATMC Materials laboratory utilizes the MMLS3 to test the rutting and fatigue resistance of various HMA mixes. Rutting is typically performed on nine gyratory specimens (shown on the left), but can be completed using slabs as well. Fatigue testing is typically completed utilizing slabs only. The ATMC materials lab has also developed their own test for specialty mixtures using the MMLS3. The MMLS3 allows versatility in laboratory experimental testing and setup.

Pavement Technology Inc. Asphalt Pavement Analyzer (APA)

Features & Benefits

The APA is a multifunction loaded wheel tester used for evaluating permanent deformation (rutting), fatigue cracking, and moisture susceptibility in asphalt mixtures.
This device simulates field conditions by applying a wheel load and measures the amount of permanent deformation under each wheel path. Wheel loading for this device is bi-directional and the speed is fixed. The APA is capable of testing six gyratory of field cores at one time.
For more information, please visit Pavement Technology Inc.

 Last Updated On: 11/16/06

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