Influence of type and dosage of micro-fibres on the physical properties of fibre reinforced mortar matrixes. (30th October 2018)

• Record Type: Journal Article
• Authors: Simões, T.; Costa, H.; Dias-da-Costa, D.; Júlio, E.
• Is Part Of: Construction & building materials. Volume 187(2018)
• Page Start: 1277
• Page End: 1285
• Publication Date: 2018-10-30
• Subjects: Fibre reinforced mortar -- Steel, polypropylene, and glass fibres -- Young's modulus -- Workability -- Porosity; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.08.058
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Three types of micro-fibres reinforced mortar matrixes were produced. The influence of different fibres in the physical properties of FRC was analysed. Workability has an important role in terms of porosity and bulk density. Porosity was high for mixtures with glass and polypropylene micro fibres. On mixtures with polypropylene and glass fibres, Dynamic Young's modulus was reduced. Abstract: An experimental study is herein presented focusing the physical properties of fibre-reinforced mortar. A reference mortar mixture was adopted and three different types of reinforcement with micro fibres (steel, polypropylene and glass) were adopted, adding different volumetric dosages, ranging from 0.5% to 2%, in 0.5% increments. The influence of each type of fibre and dosage on the properties of the mixture, including workability, density, porosity, and Young's modulus was analysed. In summary, it was observed that the workability was extremely reduced for polypropylene and glass fibres. It was found that this parameter has an important role in terms of porosity and bulk density. The latter property decreased until 8% when polypropylene or glass fibres were added to the reference mixture. However, the porosity was significantly higher for mixtures with those fibres, with values reaching nearly twice the porosity of the reference mixture. The dynamic Young's modulus was not highly sensitive to the presence of steel fibres, with a reduction lower than 5% in all tested dosages. In the case of mixtures reinforced with polypropylene fibres and glass fibres, this reduction has reached at most 16% and 13%, respectively. This effect was even higher for the static Young's modulus, experiencing a maximum reduction of 32%, for a 0.5% dosage of polypropylene fibres.