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Implementation of the HMA Shear Test for Routine Mix-Design and Screening: Technical Report.
| 题名： | Implementation of the HMA Shear Test for Routine Mix-Design and Screening: Technical Report. |
| 作者： | Walubita, L. F.; Nyamuhokya, T.; Lee, S. I.; Prakoso, A. |
| 关键词： | Hot mix asphalt (HMA), Simple Punching Shear Test (SPST), Rutting, Shear, Permanent Deformation (PD), Stress, Strain, Shear strength, Modulus, Hamburg wheel tracking test (HWTT), Data Storage System (DSS), Texas Department of Transportation (TxDOT) |
| 摘要： | Rutting and permanent deformation (PD) continues to be a flexible pavement failure mode of concern, particularly under heavy traffic loading, high-temperature environments, and severe shear stress conditions such as highway intersections and urban stop-go sections, or where lower asphalt-binder performance grades (PG) have been used. With the record summer temperatures in recent years, several surface rutting and shear failures have occurred with hot mix asphalt (HMA) mixes that had passed the Hamburg wheel tracking test (HWTT) criterion. In an effort to mitigate these surface rutting and shear failure distresses, Texas Department of Transportation (TxDOT) project 0-6744 New HMA Shear Resistant and Rutting Texas for Texas Mixes proposed several key modifications to the HWTT protocol to improve its ability to simulate field rutting conditions under extreme shear environments, including testing the HMA mixes at elevated temperatures (i.e., 60°C). Additionally, a new supplementary HMA shear test, the simple punching shear test (SPST), was developed that showed good potential to be considered as a supplement or surrogate to the HWTT for shear strength evaluation and screening of HMA mixes. This implementation project verified and refined the modified HWTT protocol and the proposed SPST test for screening HMA mixtures susceptible to rutting, permanent deformation, and shear failure. Specifically, the study involved performing the SPST and the traditional HWTT tests on HMA at both the standard (50°C) and elevated test temperatures (i.e., 60°C) and validated the laboratory test results with field performance data. The scope of work for the validation and implementation process included assisting the TxDOT districts, such as Laredo, with their routine mix-design screening and HMA shear strength testing. |
| 报告类型： | 科技报告 |
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