Environmental Effects in Pavement Mix and Structural Design Systems (2007) / Chapter Skim
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8 CHAPTER 1 INTRODUCTION BACKGROUND In the last fifty to sixty years, a significant amount of research has been focused on the use and behavior of asphalt cements within pavement applications. It is well documented that environment plays a significant role in characterizing the paving material properties as a function of time, which in turn affects the pavement performance.
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9 1. Disintegration 2.
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10 RESEARCH OBJECTIVE The standard testing procedure under the existing PP1-98 protocol requires binder samples to be tested at the following conditions: • Asphalt binder aged using T240 (RTFOT) • PAV aging time = 20 hrs • Air pressure = 2.10 MPa • Aging temperature = 100°C or 110°C as a function of climate The standard testing procedure under the existing PP2-99 protocol requires asphalt mix to be tested at the following conditions: • Asphalt mix aged in the forced draft oven • Aging time = 5 days • Aging temperature = 85°C The major limitations associated with the existing protocols can be summarized as follows: 1.
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11 The main objective of this research study can be summarized as follows: to verify and improve the estimated period or rate of aging simulated by the current Superpave binder conditioning procedures – AASHTO provisional practice PP1-98 and PP2-99. ORGANIZATION OF THE REPORT The report is organized into 12 major chapters, which describe the general study approach adopted.
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12 Improvement of the PP1-98 Protocol and Model Development This chapter presents a methodology to improve the existing PP1-98 test procedure. The current protocol specifies that one aging condition (another for desert conditions)
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13 of the field cores, the age of which were known from the construction records. The protocol was verified based on the comparison between lab aged and field aged cores.
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