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Bio-Concrete with Natural Fibres

Optimizing concrete mixture containing Miscanthus fibres for insulation bricks

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Bio-Concrete with Natural Fibres

Optimizing concrete mixture containing Miscanthus fibres for insulation bricks

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The focus of this research is to optimize the bio-concrete mixture design containing natural plant-based fibres as well as to investigate and describe the properties of the developed materials. The main goal of the project is to produce a bio-concrete design that is sufficient to be used as an insulation material, for which the required minimum compressive strength is 2,5 MPa. The aggregates used for the bio-concrete are sand (0-4 mm) and gravel (4-16 mm), the cement is type CEM I 52.5 R and the natural fibres are Miscanthus of size 0,5-2 mm. The Miscanthus fibres are pre-treated with a slurry of cement and water with a 1:1 ratio. In addition to enhancing the bonding between the fibres and the concrete mixture, the purpose of the pre-treatment is to improve the hydrophobic properties of the natural fibres.
In this paper, five different bio-concrete mixtures with increasing Miscanthus content are created, tested, evaluated and compared in order to achieve the set goals. The tests carried out assist in understanding the properties of the developed materials. The investigated properties are the workability, the density, the compressive and tensile strength and the thermal conductivity. An additional test regarding the importance of pre-treating the fibres is conducted as well. In general, the outcome of the tests prove, that the compressive strength of the bio-concrete is influenced by the Miscanthus fibre content and it is concluded, that it is necessary to conduct the fibre pre-treatment. However, the thermal conductivity of the different bio-concrete mixtures was significantly affected by the roughness and thickness of the produced samples. Afterwards, a Multi-Criteria Analysis (MCA) was implemented to assess and evaluate the five different mixtures based on the test results and the requirements of the client. The investigated criteria were the Miscanthus fibre content, thermal conductivity, cement content, density, compressive strength and workability of the bio-concrete. The mixture with the 2nd highest fibre content (21,4% of the overall volume), the highest average compressive strength (34 MPa) and the lowest cement content (13% of the overall volume) appeared to be the most preferred bio-concrete design based on the evaluation after the MCA.

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OrganisatieHZ University of Applied Sciences
OpleidingCiviele Techniek
AfdelingDomein Technology, Water & Environment
PartnerCentre of Expertise Biobased Economy, Middelburg
Datum2022-08-30
TypeBachelor
TaalEngels

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