01589803

Component

https://doi.org/10.3141/2573-10

Many hot-mix asphalt plants store material in heated silos before it is ready to be transported to construction sites. The time that material is stored in the silo is not controlled and varies widely, depending on several factors. As the material is exposed to elevated temperatures, short-term aging of the binder may occur. Another important consideration is the interaction between reclaimed asphalt pavement (RAP) and virgin binders, as blending or diffusion could occur between the binders. In this study, a virgin and 25% RAP mixture were sampled at incremental silo storage times up to 10 h. Characterization testing included performance grading, rheological indexes, Glover–Rowe parameter evaluation, rolling thin film oven aging on the binders, complex modulus, a simplified viscoelastic continuum damage model (S-VECD) for fatigue, and thermal stress restrained specimen testing of the mixtures. Simulations that used layered viscoelastic critical distresses pavement analysis to predict fatigue behavior from the S-VECD model were used to show the potential effects of silo storage time on pavement life. Results from all tests indicated that mixtures aged with an increase in silo storage time. RAP materials experienced a greater effect; this effect may be a function of the air void content or indication of blending–diffusion in the silo. Rolling thin film oven aging showed that current laboratory conditioning methods do not necessarily simulate asphalt plant production. Production parameters, such as silo storage time, have a significant impact on mixture performance.

01594379

16-1474

English

pp 76–85

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309441377

Print

Figures (6) ; References (21) ; Tables (1)

Aging (Materials); Asphalt mixtures; Asphalt pavements; Reclaimed asphalt pavements; Service life; Silos; Simulation

Storage time

Construction; Highways; Materials; Pavements

PRP, TRIS, TRB, ATRI

Jan 12 2016 4:38PM

• Artificial Neural Network Model for Estimating Temporal and Spatial Freeway Work Zone Delay Using Probe-Vehicle Data
• Civil Integrated Management for Highway Infrastructure: Case Studies and Lessons Learned
• Comparing Construction Manager–General Contractor and Federal Early Contractor Involvement Project Delivery Methods
• Comparing Life-Cycle Cost Analysis of Full-Depth Reclamation Versus Traditional Pavement Maintenance and Rehabilitation Strategies
• Cost and Scope Breakdown Structure for Functional Level Estimating of Consultant Fees
• Design and Construction of a Highway Double-Deck Suspension Bridge
• Developing a Chained Fisher Construction Cost Index for a State Highway Agency
• Effectiveness of Warranted Asphalt Pavements in Indiana
• Empirical Study of the State of the Practice in Alternative Technical Concepts in Highway Construction Projects
• Evaluation of Additional Laboratory Tests for Design of Full-Depth Reclamation Mixtures Using Foamed Bitumen
• Evaluation of Bolt Holes Fabricated by Using Plasma Arc Cutting
• Implementing Best-Value Procurement for Design–Bid–Build Highway Projects
• Innovative Design, Traffic Management, and Construction of Concrete Overlay Technology: Canadian Municipal Application
• Large-Scale Deployment of Performance-Related Specifications for Jointed Plain Concrete Pavement
• Multiyear Laboratory and Field Performance Assessment of High-Traffic US-49 Full-Depth Reclamation
• Optimizing Paving Mixtures for Durable, Cost-Effective, and Sustainable Concrete
• Specification Limits and Pay Adjustment for Longitudinal Joint Density of Asphalt Pavements: Case Study in New Jersey
• Use of Pavement Management System Data to Enhance Pavement Performance Specifications in Canada
• Using Parametric Modeling to Estimate Highway Construction Contract Time