Letters

摘要

I refer to Pierre Rossi's article in July's issue of T&TI "Steel fibres or synthetic fibres?". The change to macro synthetic fibres in tunnelling and underground construction has grown significantly in the past 5 years as their advantages have become more apparent.rnFirstly it is important that the difference between synthetic fibres is well understood. There are two types; macro synthetic fibre and micro fibre, both do different jobs and have different technical characteristics. In the most part when we make a comparison with steel fibre it is the macro synthetic fibre that is the comparable product. These different fibre types are clearly outlined in BS EN 14889 Part 1 Steel fibres and Part 2 Synthetic fibres.