Methodology for Identifying Zero-Stress Time for Jointed Plain Concrete Pavements

Autor:	Donald J Janssen, Julie M. Vandenbossche, Somayeh Nassiri
Rok vydání:	2014
Předmět:	Curl (mathematics) Engineering Water–cement ratio business.industry Mechanical Engineering Field data Young's modulus Structural engineering Temperature gradient symbols.namesake Slab symbols Geotechnical engineering Late afternoon Stress time business Civil and Structural Engineering
Zdroj:	Transportation Research Record: Journal of the Transportation Research Board. 2441:62-71
ISSN:	2169-4052 0361-1981
DOI:	10.3141/2441-09
Popis:	This study focused on identifying the zero-stress time (TZ) in jointed plain concrete pavements (JPCPs). TZ is the time when the concrete slab is sufficiently strong to deform (thermally expand or contract and thus curl) despite the existing external restraints, including the friction at the base-slab interface. It is critical to be able to identify TZ so that the temperature gradient present in the slab at TZ, known as the built-in temperature gradient, can be characterized. In this study, TZ was established through the instrumentation of 36 concrete slabs in four JPCP construction projects. Strain-temperature behavior in each slab was used to identify TZ. The slabs in each project were paved at different times of the day (morning, noon, early afternoon, and late afternoon) to investigate the effects of the ambient curing conditions on TZ. The degree of hydration at TZ (αTZ) was established for each slab. The field data were used in the development of a model for predicting αTZ as a function of the concrete water-to-cement ratio, unit weight, early-age elastic modulus, and slab thickness.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ecb1f73279860a84ad9ba4c245f7573 https://doi.org/10.3141/2441-09 Zobrazit plný text záznamu