Drying Shrinkage and Creep of Concrete with Condensed Silica Fume

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Title: Drying Shrinkage and Creep of Concrete with Condensed Silica Fume

Author(s): E. Tazawa and A. Yonekura

Publication: Special Publication

Volume: 91

Issue:

Appears on pages(s): 903-922

Keywords: autoclaving; concretes; creep properties; curing; drying shrinkage; high-strength concretes; silica.

Date: 2/1/1986

Abstract:
Drying shrinkage and creep of concrete with condensed silica fume are experimentally analyzed and compared with those of concrete without condensed silica fume. Specimens for drying shrinkage tests and creep tests are manufactured by two kind of curing methods, namely, standard and autoclave curing, and are measured in air at 20°C and 50% R.H.. Some specimens are measured in water at 20°C. Measurements for volume change and weight change are continued for 800 days. Within the scope of this research the following conclusions may be drawn: (1) Drying shrinkage of concrete with condensed silica fume is lower than that of concrete without condensed silica fume at the same water-cement ratio. But in case of standard curing, the values of drying shrinkage per unit cement paste volume are roughly the same for both concretes with and without condensed silica fume at the same compressive strength; while in case of autoclave curing, the values are higher for concrete with condensed silica fume at the same compressive strength. (2) Creep in air is high for concrete with condensed silica fume in both cases of standard curing and autoclave curing. Creep in water is high for concrete with condensed silica fume in case of standard curing, but creep in water is low for concrete with condensed silica fume in case of autoclave curing.