Creep and Shrinkage Behavior of Non-Proprietary UHPC Mix Designs
- Natassia Brenkus (The Ohio State University)
- Garrett Tatum (The Ohio State University)
- Anthony Addai-Boateng (The Ohio State University)
This is an accepted article with a DOI pre-assigned that is not yet published.Time-dependent dimensional changes in cementitious materials are critical considerations for concrete structures' design, construction, and durability. These effects are magnified in UHPC with its high cementitious material content and low water content. Characterizing the creep and shrinkage behavior of UHPC is critical for large-scale implementation in structural members, especially in prestressed concrete applications. Researchers at The Ohio State University evaluated the creep and shrinkage behavior of non-proprietary UHPC mix designs. Each mix design was intended for large-scale prestressed concrete operations and utilized locally sourced materials. Autogenous shrinkage and drying shrinkage strains were characterized by 3-inch by 3-inch by 11.25-inch concrete prisms. Length change measurements were taken at discrete testing intervals, and additional testing utilizing a novel vibrating-wire strain gauge test setup monitored shrinkage strains continuously. Creep strains were characterized using 3-inch diameter by 6-inch tall cylinders loaded to 10-ksi in compression one week after casting. Measurements were taken for a testing period up to 500-days. Creep and shrinkage strain estimates from the experimental data were utilized to predict prestress losses in a double-tee structural member and compared to existing methodologies for estimating these losses conventional concrete. The study found that typical methods for calculating these losses do not accurately predict the losses expected using UHPC due to its unique material characteristics.
Keywords: creep, shrinkage, UHPC, prestress, prestress losses
Rights: © 2013 The Author(s). All rights reserved.