United States Department of Transportation
i
Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology
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2018-01-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Materials
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Abstract:This study was conducted under RE-CAST Project 1B “Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology.” High performance concrete with adapted rheology (HPC-AR) is a term for a wide range of concrete materials for which flow and workability is a major design objective. HPC-AR includes self-consolidating concrete (SCC), but HPC-AR is a term that encompasses “semi-SCC”, flowable grouts, and other materials with desirable rheological performance. The term “adapted rheology” refers to the material designer’s task to produce concrete to match the specific needs of a given construction scenario. Thus, HPC-AR is not simply a new name for SCC, but it emphasizes the control of material behavior to achieve easy and reliable placement of concrete that provides superior hardened properties as required by the application. The project focused on understanding mechanisms responsible for SCC formwork pressure drop over time. The fresh state properties of SCC, mortar, and cement paste mixes like workability, static yield stress gain and temperature change over time were evaluated and correlated with the formwork pressure data. The mix parameters for the concrete, mortar mixes like water to cementitious ratio, the addition of fly ash, aggregate content, maximum aggregate size, aggregate moisture content, addition viscosity modifying agent, the addition of fibers were investigated. Emphasis was also placed on studying the influence of formwork dimensions on the formwork pressure. The results showed that the formwork pressure drop over time was highly dependent on the thixotropy which can be measured from static yield stress and dynamic yield stress gain over time.
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