Effect Of Fly Ash And Polypropylene Fiber On Early Shrinkage And Cracking Of Alkali-Activated Slag Cement

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Title: Effect Of Fly Ash And Polypropylene Fiber On Early Shrinkage And Cracking Of Alkali-Activated Slag Cement

Author(s): Yuanyuan Wan and Yonghao Fang

Publication: Special Publication

Volume: 305

Issue:

Appears on pages(s): 24.1-24.10

Keywords: alkali-activated slag cement; cracking; fly ash; polypropylene fiber; shrinkages

Date: 9/1/2015

Abstract:
The effects of substituting 5-20% fly ash for slag and adding 0.10~0.30% polypropylene fiber on the physical and mechanica1 properties, shrinkage and cracking behaviors, water permeability and porosity of alkali-activated ground granulated blast furnace slag cement paste and mortar are studied. The results show that replacing 5-15% fly ash for slag in the alkali-activated slag cement paste and mortar increased the flexural strength, though the compressive strength were slightly decreased. When the replacement of fly ash for slag was increased to 20%, both the flexural and compressive strengths of the paste and mortar begin to decrease. The early shrinkage and cracking were reduced by the fly ash replacement. Adding 0.10~0.30% polypropylene fiber decreased both the flexural and compressive strengths, whereas the shrinkage, especially the cracking of the alkali-activated slag cement was greatly reduced.