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:
Symposium Paper
Volume:
305
Issue:
Appears on pages(s):
24.1-24.10
Keywords:
alkali-activated slag cement; cracking; fly ash; polypropylene fiber; shrinkages
DOI:
10.14359/51688584
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.