The research objective was to evaluate the temperature dissipation during the Hot Mix Asphalt construction from the surface, base, and subbase layers in Southern Taiwan. The scope was to install a multilayered temperature monitoring station along with the weather station that allows temperature data to be recorded and stored continuously. The multilayered temperature monitoring station was installed and comprised of K-type thermocouples. Thermocouples were installed from the surface in-depth 0, 5, 10, 15, 17, 20, 30, 42.5, 72.5, and 90-cm along with the construction sequences starting from base and subbase compaction on soils and graded aggregates in May 2018 and thereafter the paving task of HMA surface layer in August, 2018. It has to be noted that the temperature data was recorded immediately and continuously when thermocouples were installed which enables the monitoring of pavement temperature dissipation during the HMA construction. In this paper, we aim to present a temperature dissipation pattern that is able to improve and facilitate the field HMA paving task. It is nine hours or more, instead of six hour of which roadways agencies often regulate, that is required for HMA pavement materials to cool down and open for traffic.
The research objective was to develop the processing and assess the piezoelectric properties of asphalt-based PZT composites. The pilot study was initiated to produce the two different composite specimens, namely ten percent of AC-20 binder with ninety percent of PZT (10/90) and the other twenty percent of binder with eighty percent of PZT (20/80) by volume. The processing required compressing the asphalt-based composite with 80MPa and eight minutes by a MTS device and the polarization procedures involved utilizing poling voltage of 2.5 kV/mm to trigger the piezoelectric properties under conditioning temperatures of 10, 20, 30, 40, and 50-°C. The polarization time was set to 5, 10, 20, 40, 60-minutes. Piezoelectric properties including piezoelectric strain constants (d33) and electromechanical coupling factors (κt) were investigated. For 100% PZT specimens, results of piezoelectric strain constants stayed about 400 pC/N after 20 minutes of polarization time and under 20 to 50-°C. The electromechanical coupling factors were about 64.9 to 70.7-% under 20 to 50-°C, respectively. For asphalt-based PZT composite (10/90), results of piezoelectric strain constants were 50 and 55 after 20 minutes of polarization time and under 40 and 50-°C. The electromechanical coupling factors were about 24.4 to 28.6-% under 40 and 50-°C, respectively. It has to be noted that the polarization process cannot be completed in asphalt-based PZT composites under 10 to 30-°C in this study. More assessment are undertaking on the (20/80) specimens that data and analysis will be reported to the Conference in Denver.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.