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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Significance of Microstructure of the Glass Fiber-Cement Paste Interfacial Zone in Long-Term Durability of GFRC Composites
Author(s): Mitsunori Kawamura and Shin-Ichi Igarashi
Publication: Special Publication
Appears on pages(s): 799-820
Keywords: durability; electron microscopes; glass fibers; interfacial zone; microstructures; mortars; reinforced concretes; tensile strength; Materials Research
Abstract:The long-term durability of glass fiber reinforced (GFR) mortars and concretes manufactured by the premixing method was investigated. Microhardness measurements and the quantitative back-scattered electron image (BSE) analysis were made in the regions around glass fiber strands embedded in the cement paste. Changes of flexural strength and toughness in the GFR mortars with age were found to be related to the features of microstructure in the interfacial regions. The toughness of the GFR mortars decreased with age in response to the increase in microhardness at the immediate vicinity of strands and around 70 to 100 æm from the interface. The solidification in the regions around 70 to 100 æm from interface, as well as the formation of the hydration products in the spaces among the glass filaments, appear to relate to reduction in toughness in GFRC composites.
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