Abstract
Resistance to freezing and thawing of glass fibre reinforced concrete (GRC) modified with silica fume and metakaolin was tested according to scaling at freezing test method with de-icing salt after 112 cycles. Surface mass loss was obtained, flexural strain energies calculated from load- deformation curves and ductile/ brittle behavior of GRC composite explained. SEM micrograph analysis was used to identify possible flaws on the surface of filaments and fiber-matrix contact zone due to freeze-thaw influence.
Highlights
Materials used for the production of reference glass fibre reinforced concrete (GRC) concrete samples include type CEM I 52,5R ordinary Portland cement (OPC), quartz sand, polycarboxylic ether- based superplasticizer, alkali resistant (AR) glass fibres and water
This research showed that severe freeze- thaw conditions did not decrease the initial GRC flexural strength, which even increased from 10 MPa to 12 MPa (Fig. 6)
The addition of silica fume and metakaolin had no significant impact on initiaTl hfliesxruesreaalrccahpsahcoiwtye.d that severe freeze- thaw conditions did not decrease the initial GRC flexural strength, which even increased from 10 MPa initial flexural capacity
Summary
Rimvydas Moceikis*, Asta Kičaitė Faculty of civil engineering, Vilnius Gediminas Technical University, Sauletekio av. 11, LT-10223 Vilnius, Lithuania. Rimvydas Moceikis*, Asta Kičaitė Faculty of civil engineering, Vilnius Gediminas Technical University, Sauletekio av. Due to structural and technological reasons, outer skin layer is quite thick- usually 80mm, which can be reduced to 15mm by using innovative and economical composites, such as glass fibre reinforced concrete (GRC). Silica fume and metakaolin were used as additives, dosing 2,5%, 5% and 7,5% from mass of cement and proved to enhance long term ductility of glass fibre reinforced composite after freeze- thaw tests. Flexural stain energy is used as a new concept in concrete freeze- thaw durability to investigate fibre reinforced composites ductile/ brittle behaviour. Resistance to freeze- thaw of glass fibre reinforced concrete (GRC) modified with silica fume and metakaolin was tested according to freeze/ thaw test method with de-icing salt after 112 cycles.
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