Use of Mining Waste to Produce Ultra-High-Performance Fibre-Reinforced Concrete

Abstract

This research work analyses the influence of the use of by-products from a fluorite mine to replace the fine fraction of natural aggregates, on the properties of Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). Replacing natural aggregates for different kinds of wastes is becoming common in concrete manufacturing and there are a number of studies into the use of waste from the construction sector in UHPFRC. However, there is very little work concerning the use of waste from the mining industry. Furthermore, most of the existing studies focus on granite wastes. So, using mining sand waste is an innovative alternative to replace natural aggregates in the manufacture of UHPFRC. The substitutions in this study are of 50%, 70% and 100% by volume of 0–0.5 mm natural silica sand. The results obtained show that the variations in the properties of consistency, compressive strength, modulus of elasticity and tensile strength, among others, are acceptable for substitutions of up to 70%. Therefore, fluorite mining sand waste is proved to be a viable alternative in the manufacturing of UHPFRC.

Use of Waste from Granite Gang Saws to Manufacture Ultra-High Performance Concrete Reinforced with Steel Fibres

“…For a ratio of 25% fly ash, the variation is less than 6.5%. J. Suárez et al [15] also observed a slight variation when incorporating waste mining sand (WMS) as an alternative to the finest silica sand. For a replacement of 100% WMS, the loss is less than 6%.…”

“…Most of the studies carried out focus on the use of waste from the extractive industry to make conventional concrete or HPC, few of them focus on the use of this waste for the manufacture of UHPC or UHPFRC. J. Suárez et al [15] analysed the influence of incorporating waste from fluorite mines as an alternative to fine aggregate in the manufacture of UHPFRC. The results show that a 70% substitution provides acceptable values of compressive strength, flexural strength, and tensile strength.…”

Mechanical and permeation response characteristics of basalt fibre reinforced tailings to different reinforcement technologies: an experimental study

“…Thereafter worldwide researchers had expanded the application to many aspects of production to study the reinforcement technology. In terms of reinforcement materials: natural fibre and industrial by-products [15], mining waste [16], polypropylene [17], polyacrylonitrile and glass fibres [18] and basalt fibre (BF) [19] had been studied. In terms of reinforcement objects: cemented tailings backfill [20,21], concrete slabs [22], tailingscement blends [23], soil [24] and seawater sea sand concrete [25] had been investigated.…”