Material Research Overview at UNH
Civil Engineering Materials research at UNH focuses on asphalt and portland cement concrete pavements, specifically with material characterization and testing in the laboratory. The Materials group performs work with recycled materials, including reclaimed asphalt pavement (RAP), recycled asphalt shingles (RAS) and recycled portland cement concrete. These include laboratory performance evaluation as well as performance of pavements in service.
Current Active Research Projects
TPF 5(230): Northeast High RAP Pooled Fund Study
Funded by various state DOTs and FHWA
Research Partners: NC State Univ, Rutgers Univ, UMass Dartmouth
In this project, over 30 different plant produced mixtures with RAP contents up to 40% by total weight of mixture are being evaluated. Testing is focusing on fatigue and low temperature cracking using a suite of mixture and binder testing. The impact of binder grade, RAP level, asphalt content, and production parameters are being evaluated.
Performance of High RAP Pavement Sections in NH
Funded by NHDOT
There are two phase of this project:
Can We Use More RAP? New specifications for RAP/RAS mixtures in NH.
Funded by NHDOT
This project will evaluate 25 different plant produced mixtures containing various levels and combinations of RAP/RAS, binder grades, and binder sources. The plant mixed, plant compacted specimens will be compared with laboratory mixed, laboratory compacted specimens with the goal of developing specifications based on laboratory mixtures.
NETC 07-1 In-Place Response Mechanisms of Recycled Layers Due to Temperature and Moisture Variations
Funded by New England Transportation Consortium
Research Partners: Worcester Polytech Inst, UMass Dartmouth, Forest Service
The main objective of this project is to determine the in-place properties of pavement cross-sections containing recycled materials common to the New England region, and to relate changes in those properties to variations in temperature and moisture. The study will focus primarily on obtaining field data from base layers that have been constructed with different types of unbound or bound recycled layers such as full depth reclamation (with or without stabilizing additives), plant mix recycled asphalt pavement (PMRAP), or foamed asphalt.
FHWA Flooded Pavement Assessment
Funded by FHWA
Research Partners: Worcester Polytech Inst, Villanova Univ, Infrasense
The objective of this project is to develop guidelines for short-term assessment of flooded pavements for the purpose of determining the optimum time to reopen a road to different types of traffic. The product will be a set of guidelines that will provide decision makers with the ability to assess flooded pavements using a rational methodology to determine the required testing based on available resources and risk assessment. The guidelines will address the assessment of flooded pavements based on performance properties and an understanding of the reduced structural capacity of roadway systems after a flood event.
Developing a Performance-Related Specification Program for Rhode Island
Funded by RIDOT
Research Partner: Villanova Univ
The objective of this project is to develop pay adjustment factors for typical RI DOT asphalt concrete mixtures. The pay adjustment factors will be based on pavement life differences predicted using measured material properties and distress models from performance related specification software. The scope of the project will include evaluation of two typical surface mixtures and a base mix (that contains between 15 to 25% reclaimed asphalt pavement) for non-interstate highways.
The materials research facilities include 1,000 square foot materials laboratory located in Kingsbury Hall S124.
Sieve shakers and scales for sieving and batching aggregate for mixing
Two 10 cubic foot ovens, mixers, hot plates, scales, and fume hood for mixing asphalt concrete
Superpave Gyratory Compactor manufactured by Industrial Process Controls, Ltd. for compacting asphalt specimens
Coring rig and saws for cutting and coring final test specimens from those compacted in the SGC
Corelok device for vacuum sealing
50 kip Instron testing frame with a 20 kip actuator and load cell, computer control and data acquisition with LabView software interface, and integrated temperature chamber with ±1oC control for testing asphalt specimens. Appropriate jigs, LVDTs and attachments for conducting testing in uniaxial tension, uniaxial compression, and indirect tension.
Third scale Model Mobile Load Simulator (MMLS3) including laboratory core test bed, wet heater, dry heating/cooling unit, environmental chamber, and generator for field testing.
Asphalt Mixture Performance Tester with capability to perform fatigue testing and accommodate the small specimen geometry
Environmental conditioning chamber
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