Reduction of Autogenous Shrinkage in Cement Paste by IC Using Jute Fiber

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Title: Reduction of Autogenous Shrinkage in Cement Paste by IC Using Jute Fiber

Author(s): Mitsuo Ozawa and Hiroaki Morimoto

Publication: Special Publication

Volume: 290

Issue:

Appears on pages(s): 1-12

Keywords: Autogenous shrinkage strain, cement paste, internal curing, jute fiber

Date: 9/14/2012

Abstract:
Internal curing is an effective method of preventing autogenous shrinkage in early-age concrete. In this approach, water-retentive particles act as internal reservoirs to supply water to the surrounding cement paste matrix. The objective of this study was to determine how the early-age shrinkage behavior of cement-based materials is affected by the addition of saturated jute fiber under sealed conditions. The four cement-paste specimens with water-cement ratio of 0.25, and the individual jute fibers of 6 mm length. The fiber contents by volume were 0, 0.5, 1.0 and 2.0%, respectively. The straw-like structures of the jute fiber were observed in a scanning electron microscope photograph. Additions of 0.5% and 1.0% of jute fiber by volume of cement paste resulted in 12% and 36% reductions in autogenous shrinkage strain at a material age of 8 days, respectively. Additions of 0.5% and 1.0% of jute fiber by volume of cement paste resulted in 3% and 22% reductions in compressive strength at a material age of 8 days, respectively. The material segregation was observed in the cement paste with 2.0% of jute fiber by volume. These results indicate the suitability of jute fiber for an internal curing material.