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INTERMEDIATE CONCRETE: GLASS FIBRE MIXES

Some concrete projects don’t lend themselves to traditional steel reinforcement techniques. We take a look at a handy alternative – glass fibre mixes.

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Glass fibre mixes offer a great reinforcement alternative to steel. By making use of alkali-resistant glass fibres (ARGF) in your mix, you get added tensile strength without many of the problems associated with steel reinforcement – e.g. rust, exposed steel and unwieldy thickness. Glass fibre mixes are particularly suited for crafting thin-walled pieces, such as bowls or planar forms.

Please be aware, however, that glass fibre concrete is not recommended for an application where it will be exposed to damp or rain over a long period.

Making a Glass Fibre Mix

A general purpose glass fibre concrete, you can try out the following mix:

• 1 kg cement

• 670 g sand

• 320 g water

• 10 g superplasticizer

• 72 g ARGF (12 mm length)

This is a very cement-rich mixture; for less shrinkage, use equal weights of cement and sand. For small, flat products use longer strand fibres (24 mm).

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