In Situ Cyclic Loading of Concrete Pavement Overlays Supported on Geotextile and Asphalt Interlayers: Buchanan County Road D-16 - TPF-5(437)

(2022) In Situ Cyclic Loading of Concrete Pavement Overlays Supported on Geotextile and Asphalt Interlayers: Buchanan County Road D-16 - TPF-5(437). Transportation, Department of

Preview	PDF Buchanan_CR_D-16_CP_overlays_on_geotextile_and_asphalt_interlayers_w_cvr.pdf File Size:11MB
Preview	PDF Appendix A_Cyclic APLT Results on ACC_2020.pdf File Size:6MB
Preview	PDF Appendix B_DCP Test Results_2020.pdf File Size:135kB
Preview	PDF Appendix C_Static APLT Results on PCC Overlay_2020.pdf File Size:1MB
Preview	PDF Appendix D_Cyclic APLT Results on PCC Overlay_2020.pdf File Size:2MB
Preview	PDF Appendix E_Static APLT Results on PCC Overlay_2021.pdf File Size:733kB
Preview	PDF Appendix F_Cyclic APLT Results on PCC Overlay_2021.pdf File Size:886kB

Abstract

Automated plate load tests (APLTs) were conducted on County Road (CR) D-16 in Buchanan County, Iowa, to assess and compare the performance of unbonded concrete overlay test sections with three different geotextile fabric interlayers. The pavement was constructed in 2020. Field testing was performed on the asphaltic cement concrete (ACC) pavement prior to construction and then on the unbonded concrete overlay 2 months after construction and 1 year after construction. Cyclic and static APLTs were performed to assess the composite modulus and permanent deformation. Test results showed that the permanent deformation decreased by about 50 times after placing the PCC overlay over the ACC, both in sections with and without the geotextile interlayers. The composite resilient modulus values on the overlay increased about 10 times when compared to modulus values on the underlying ACC. Results indicated that the composite resilient modulus was still greater than 200,000 psi be decreased after 1 year along with increased permanent deformation in the control section (no geotextile interlayer). In the sections with a geotextile interlayer, the composite resilient modulus value increased 10% to 30% in two sections and decreased 10% in one section, while the permanent deformations increased by 30% to 60%. Results for the geotextile interlayer sections demonstrated better structural capacity than the control sections and monitoring of the load-deformation response of the pavement structure over time (3, 5, and 10 years after construction) is recommended.