Grouts for Bridge Post-tensioning Tendons at Below-Freezing Temperature

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Title: Grouts for Bridge Post-tensioning Tendons at Below-Freezing Temperature

Author(s): Yang Fumin, Ma Rongtian, Zhang Yuanqing, and Zhang Yong

Publication: Special Publication

Volume: 303

Issue:

Appears on pages(s): 21-32

Keywords: grout; bridge; post-tensioning tendon; winter construction; efflux time; strength

Date: 6/1/2015

Abstract:
Materials for grouting post-tensioning tendons of a bridge at below freezing temperature (–10oC or 14oF) were studied. The water/cementitious material ratio was a maximum of 0.32 and the grout properties were tested at -10oC (14oF) according to applicable Chinese standards for past-tensioning grouts. After special treatment, the efflux times of the modified grouts were between 14 and 22 seconds after mixing and less than 30 seconds after 60 minutes without agitation. The final strength of the grout reached 50-60 MPa (7975-8700 psi) after 35 days of curing (7 days at below freezing temperature and 28 days at a standard temperature), which was 95%-100% of the reference strength for curing at a standard temperature.