A Comprehensive Characterization of Asphalt Mixtures in Compression
http://swutc.tamu.edu/projectdescriptions/600451-00006.htm
Record Type: UTC
Asphalt pavements exhibit various distresses such as rutting, cracking and moisture damage if asphalt mixtures are not well designed and constructed based on material fundamental mechanical principles. Many research efforts had been made on the investigation of the permanent deformation and cracking, which were normally investigated individually in existing studies. However, they are companions and can be affected by each other. Thus it is urgently necessary to investigate the rutting and cracking simultaneously by comprehensively analyzing the mechanistic properties of asphalt mixtures under a compressive load. In addition, the existing mechanistic model could not predict the material performance due to their deficiencies in addressing some crucial characteristics of the asphalt mixtures, such as the anisotropy including inherent anisotropy and stress-induced anisotropy, the hydrostatic-dependent yield surface satisfying convex requirements and considering the differences between compression and extension in a full range of friction angle, and the viscofracture properties of the asphalt mixtures that occurs in the tertiary stage in compression. This proposed research will develop an advanced constitutive model to comprehensively characterize the anisotropic, viscoplastic, and viscofracture properties of the asphalt mixtures in compression. A systematic testing protocol and analyzing formulations will be proposed to rapidly and accurately determine the parameters of the constitutive model and relate these parameters to measurable and understandable engineering material properties. The permanent deformation and cracking will be investigated simultaneously with using the proposed mechanistic model, which include the accelerating effect among them, the effect of binder, air voids and aging on the evolution of damages. In addition, practical distress prediction models for rutting and cracking will be proposed based on the results of the mechanistic analysis.
Start date: 2012/3/1
End date: 2013/8/31
Status: Active
Contract/Grant Number: DTRT12-G-UTC06
Secondary Number: 600451-00006
Total Dollars: 59880
Source Organization: Southwest Region University Transportation Center (SWUTC)
Date Added: 04/30/2012
Index Terms: Pavement distress, Asphalt mixtures, Rutting, Cracking, Compressive strength, Mechanistic design,
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Texas A&M Transportation Institute
http://tti.tamu.edu/
Texas A&M University System
3135 TAMU
College Station, TX 77843-3135
USA
Phone: (979) 845-1713
Fax: (979) 845-9356
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Zhang, Yuqing
Phone: (979) 458-0893
Email: zyqtamu@tamu.edu
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