The Influence of Glass Fibers as Dispersed Reinforcement on Hydric Properties of Concrete

Abstract

In this paper, the effect of different kind of glass fiber on hydric properties of ultra-high performance concrete and normal strength concrete is determined. It was the use several types of micro fine high-dispersible alkali resistant fibers that prevent the formation of shrinkage cracks caused by tensions. Comparative measurements with both concrete without glass fibers are done as well. The main aim of this experimental work is to obtain sufficiently accurate input data for the estimate of durability surface layers of concrete which are connected with water transport and its accompanying effects such as biological degradation, water soluble salt transport or degradation by rainwater absorbing oxides of sulfur and carbon from air.

Corrosion of Glass Fibres in Ultra High Performance Concrete and Normal Strength Concrete

“…The first concrete mixture was regular concrete identified as NSC (Normal Strength Concrete), the second concrete mixture was UHPC concrete. Both the concrete mixtures were prepared from Czech made precursors and their preparation and casting into moulds (prisms sized 40 × 40 × 160 mm) was carried out under the Czech standard ČSN EN 196-1 [32]. According to the manufacturer´s recommendation, the content of AR glass fibres in the prepared concrete mixture was 0.6 kg•m -3 for HD fibres and 3.0 kg•m -3 for HP fibres.…”

“…In both the cases there were less corrosion products on the fibre surface and they did not form a continual layer as it was the case with the fibres in the NSC concrete mixture. The reason of the difference is probably the low value of absorbability caused by higher compactness of UHPC concrete, with a smaller proportion of open porosity which is up to 3 times higher in NSC concrete mixtures (for data and measurements see [32]). …”

Influence of cement replacement by metakaolin and limestone filler on the properties of UHPC

“…UHPC je beton visokih uporabnih svojstava tlačne čvrstoće veće od 100 MPa, vlačne veće od 15 MPa te time povećanih mehaničkih svojstava i superiorne trajnosti u odnosu na običan beton (≤ 60 MPa) [12]. Iako je u nazivu ovog cementnog materijala sadržana riječ beton, riječ je zapravo o mortu, a naziv beton dan je zbog prisustva čeličnih vlakana u uobičajenom sastavu [1].…”