Title:
Shrinkage and Creep of SCC used for Precast, Prestressed Applications
Author(s):
Khayat
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
Proper evaluation of shrinkage is critical for the design of prestressed structural members. An experimental program was undertaken to evaluate autogenous and drying shrinkage of precast, prestressed self-consolidating concrete (SCC). Sixteen SCC with slump flow of 680 ± 20 mm were evaluated. These mixtures were made with 440 to 500 kg/m3 of binder, Type MS cement or HE cement and 20% Class F fly ash, 0.34 to 0.40 w/cm, viscosity-modifying admixture content of 0 to 100 mL/100 kg of binder, and 0.46 to 0.54 sand-to-total aggregate volume ratio. Two high-performance concretes (HPC) with 0.34 and 0.38 w/cm and slump of 150 mm were also investigated. SCC developed 5% to 30% higher drying shrinkage at 300 days than the HPC but similar autogenous shrinkage. Shrinkage was compared to prediction models proposed by AASHTO 2004 and 2007, CEB-FIP 90, GL 2000, and ACI 209. The CEB-FIP 90 and a modified AASHTO 2004 models are found to provide adequate prediction of shrinkage for precast, prestressed SCC.