Due to the success of the MoDOT 2017 Intelligent Compaction (IC) and Infrared Scanning (IR) projects that demonstrated Quality Control (QC) improvements in 13 field projects, MoDOT established a plan that included further IC and Paver-mounted Thermal Profile Systems (PMTPS) projects in 2018-2019 with a goal of full implementation in 2021. To ensure continued success of the MoDOT IC-PMTPS projects in 2018 and beyond, MoDOT procured Consulting Support for the selected IC-PMTPS projects in 2018-2019 (i.e., Phase II). This research details the results from the 2019 IC-PMTPS Projects and an average of the overall results from 2017-2019. There was a significant improvement in IC and PMTPS data management and analysis efforts by contractors from 2017 to 2019. The thermal segregation continually improved from 2017 to 2019, according to AASHTO PP80 definitions of thermal segregation. There was also significant improvement in IC coverage from 2018 to 2019. Based on the 2017-2019 projects and lessons learned, recommendations for future implementations are included in the study.
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Report number: cmr 20-005
Published: May 2020
Project number: TR201902
Authors: Dr. George Chang, Amanda Gilliland, and Victor (Lee) Gallivan
Performing organization: Transtec Group, Inc.
The main objective of this research is to investigate the performance of Compacted Concrete Pavement (CCP) with special design features of surface texture that can reduce construction cost and secure safe and durable surface texture. This research was part of a larger project undertaken by the City of Mexico, Missouri in collaboration with Missouri Department of Transportation (MoDOT).The CCP mixture was evaluated for key fresh properties (unit weight, air content, and Vebe consistency), mechanical properties(compressive strength, flexural strength, and modulus of elasticity), drying shrinkage, and durability (air-void system, freeze thaw resistance, scaling resistance, bulk and surface resistivity). The results of this project aimed to add value to the current state ofpractice related to the use of CCP, synthesize current technical knowledge, study the potential problems associated with the use o fCCP in pavement construction in Missouri, and propose guidelines for best practice related to CCP construction. Test results indicate the reliability of mechanical properties for the investigated CCP material. The compressive and flexural strengths and elastic modulus of the investigated concrete were approximately 4970 psi, 410 psi, and 4120 ksi for cast-in-field samples and 4470 psi, 450 psi, 3550 ksi for core samples, respectively. The drying shrinkage was limited to 60 με after 70 d of testing, indicating low drying shrinkage. The durability tests showed that the CCP mixture can be classified as a mixture with moderate chloride ion permeability and acceptable resistance to de-icing salt scaling. However, the non-air entrained CCP showed poor resistance to freezing and thawing.
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Report number: cmr 20-004
Published: May 2020
Project number: TR201919
Authors: Kamal H. Khayat and Nima Farzadnia
Performing organization: Missouri University of Science & Technology
