Abstract. Glass fiber reinforced concrete (GRC) is used for 40 years to create world's most stunning and complex architectural elements due to its high mechanical properties, particularly flexural strength. Yet it is very important to note that any type of glass fibers in the concrete matrix are undergoing complex ageing processes, resulting to significant decrease of initial mechanical characteristics of this composite material under natural weathering conditions. Aspects of GRC durability are mainly dependent from the properties of fibers and interaction between them and concrete matrix. In this article, long term strength retention of this composite material is discussed, existing experimental data of weathering tests presented, and main corrosion mechanisms explained. Lack of knowledge about freeze-thaw resistance of glass fiber reinforced concrete is addressed. Finally, latest attempts of GRC durability improvement are reviewed, such as adding micro fillers, polymers to the concrete matrix and enhancing surface of fibers in Nano scale.

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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.

This paper includes the historical use of pumice pozzolan, results of an accelerated age test performed by Washington University on GFRC composites containing a range of UltraPozz pumice pozzolan and test results from a 2012 study by the University of Utah on concrete samples containing UltraPozz pozzolan. The results shown in this paper include pozzolanic effect, hydration, workability, durability, chemical and physical characteristics.

Thin wall cement composites find a wide range of special applications for making light weight façade exterior wall and urban decorative elements, as well as a part of load bearing constructions. AR glass fibre is the most popular reinforcing material for producing glass fibre reinforced concrete (GRC). Possibilities for use alternative Carbon and PVA fibres are analysed in this work. The study is focused on investigation of technological and mechanical properties of thin wall (15 mm) cement composite plates reinforced by tree types of fibres.

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