Effect of polypropylene fibres on the workability parameters of extrudable cementitious materials

Suntharalingam, Thadshajini, Nagaratnam, Brabha, Poologanathan, Keerthan, Hackney, Philip and Ramli, Jeffri (2020) Effect of polypropylene fibres on the workability parameters of extrudable cementitious materials. In: Second RILEM International Conference on Concrete and Digital Fabrication: DC 2020. RILEM Bookseries (28). Springer, Cham, pp. 516-526. ISBN 9783030499150, 9783030499167

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EFFECT_OF_POLYPROPYLENE_FIBRES_ON_THE_WORKABILITY_PARAMETERS_OF_EXTRUDABLE_CEMENTITIOUS_MATERIALS.pdf - Accepted Version
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Official URL: https://doi.org/10.1007/978-3-030-49916-7_53

Abstract

3D Concrete Printing (3DCP) has aa potentiality to produce complex, geometries and can modify the details rapidly using a printer integrated with a pump and nozzle. From the earlier studies on 3DCP, it is distinguished that the rheological behaviour of the material, printing direction, and printing time may have significant effects on the overall structural behaviour of the printed structure. The layered concrete may create weak joints in the specimens and reduce the load bearing capacity in terms of compressive, tensile and flexural strength that requires stress transfer across or along these joints The present study focuses on the examination of the effect of adding polypropylene (PP) fibres on the failure behaviour of print mortar on printed concrete, on different print directions. The Silica Fume (SF) based control mix was used in the analysis with fibre addition in different mass fraction of binder ranging from 0.5% to 3.0%. Those mixes were designated after the detailed fresh property analysis and control cementitious specimens without fibre inclusion were also printed for comparison. The specimens were collected in different orientations from manual extruded concrete blocks and tested for mechanical properties. For the materials tested, it is found that the mechanical properties such as compressive and flexural strength of extruded samples are governed by its printing directions. The mixes with 1.0% and 0.5% PP fibre addition exhibit the better performance in terms of flexural strength and 0.5% PP mix can be considered as the optimum fibre content with respect to the compressive strength.

Item Type: Book Section
Uncontrolled Keywords: Additive manufacturing, Extrusion-based 3D concrete printing, Polypropylene (PP) fibres, Workability, Fresh properties
Subjects: H100 General Engineering
K200 Building
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Related URLs:
Depositing User: Ay Okpokam
Date Deposited: 27 Nov 2019 16:33
Last Modified: 26 Aug 2020 10:18
URI: http://nrl.northumbria.ac.uk/id/eprint/41636

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