Fibre decider

摘要

Although macro-synthetic fibres may have a place, on occasions, in sprayed concrete support for some mining applications, uncertainty remains over their suitability for application in both sprayed concrete and segmental final linings for civil engineering structures. The major concerns that designers needrnto consider when specifying a generic fibre type for final lining applications are anticipated convergence/deflections; long term creep characteristics of the fibre type after cracking of the concrete matrix and performance in fire.rnIn addition, more practical matters, such as the effect of the fibre type on the plastic properties of the concrete should also be taken into account.rnThe performance of fibre reinforced concrete increases with the performance of the concrete matrix; the volume of fibres in the mix and the intrinsic performance of the fibre in the matrix (geometry, aspect ratio (I/d), method of anchoring, tensile strength, E modulus etc).rnTherefore clear test procedures and performance criteria of the FRC should be specified for each project.