Use of Hemp Fibres in 3D Printed Concrete

Abstract:

The use of fibres as reinforcement of 3D printed concrete is widely known and applicable in many situations. However, most of the applied fibres are not produced from renewable resources. Natural fibres are commonly considered as an ecological alternative for these fibres. In order to contribute to improvement of the sustainability of 3D printed concrete, natural fibres such as hemp can replace these synthetic fibres. The objective of this study is therefore to study the possibilities of adding hemp fibres for 3D printing purposes. Due to the comparable properties of hemp and synthetic fibres, natural fibres tend to be suitable for printing purposes. Mixes are made at laboratory scale using batches of 1 – 3 kg. The study examines the effect of adding hemp fibres for the mechanical and fresh state properties of hemp-based concrete. Mechanical properties from bending tests and direct tensile tests show comparable properties of mortars containing hemp fibres and mortars containing synthetic fibres. The fresh state behaviour of the designed concrete mix showed promising and comparable results for a mix based on 0.5wt% of hemp fibres. One of the major issues regarding the use of natural fibres is the irregularity and high water uptake of the fibres. Due to its high hydrophilicity natural hemp fibres take up much water and can therefore degrade. For this study the effect of water uptake did not have much influence on the mixing and printing purposes. By printing a wall element on laboratory scale the use of hemp fibre-reinforced 3D concrete is validated.

• Periodical: Construction Technologies and Architecture (Volume 1)
• Pages: 758-765
• DOI: https://doi.org/10.4028/www.scientific.net/CTA.1.758
• Online since: January 2022
• Authors: Naomi Zahra van Hierden*, Florent Gauvin, S.S. Lucas, T.A.M. Salet, Henricus Jozef Hubertus Brouwers
• Keywords: 3DPC, Cementitious Matrix, Extrudability, Hemp Fibres, Natural Fibres

References

[1] Baley,C., 2002. Analysis of the flax fibres tensile behaviour and analysis of the tensile stiffness increase. Composites Part A: Applied Science and Manufacturing 33-7, 939-948. https://doi.org/10.1016/S1359- 835X(02)00040-4.

DOI: 10.1016/s1359-835x(02)00040-4

[2] Bonnet-Masimbert, P.-A., Gauvin, F., Brouwers, H.J.H., Amziane, S., 2020. Study of modifications on the chemical and mechanical compatibility between cement matrix and oil palm fibres. Results in Engineering 7, 100150. https://doi.org/10.1016/j.rineng.2020.100150.

DOI: 10.1016/j.rineng.2020.100150

[3] Chen,Y., Veer, F., Çopuroğlu, O., 2017. A critical review of 3D concrete printing as a low CO2 concrete approach. HELON 62-3, 167-194.

[4] Dong, Y.H., Ng, S.T., Kwan, A.H.K., Wu, S.K., 2015. Substituting local data for overseas life cycle inventories – a case study of concrete products in Hong Kong. Journal of Cleaner Production 87, 414-422. http://dx.doi.org/10.1016/j.jclepro.2014.10.005.

DOI: 10.1016/j.jclepro.2014.10.005

[5] Le, T.T., Austin, S.A., Lim, S., Buswell, R.A., et al, 2012. Hardened properties of high-performance printing concrete. Cement and Concrete Research 42, 558-566. https://doi.org/10.1016/j.cemconres. 2011.12.003.

DOI: 10.1016/j.cemconres.2011.12.003

[6] Mohanty, A.K., Wibowo, A., Misra, M., Drzal, L.T., 2004. Effect of process engineering on the performance of natural fiber reinforced cellulose acetate biocomposites. Composites part A: Applied Science and Manufacturing 35-3, 363-370. https://doi.org/10.1016/j.compositesa.2003.09.015.

DOI: 10.1016/j.compositesa.2003.09.015

[7] Naik, D., Sharma, A., Chada, R., et al., 2019. Modified pullout test for indirect characterization of natural fiber and cementitious matrix interface properties. Construction and Building Materials 208, 381-393. https://doi.org/10.1016/j.conbuildmat.2019.03.021.

DOI: 10.1016/j.conbuildmat.2019.03.021

[8] Rathod, J.D., 2014. Effect of single fiber pull out test result on flexural performance of ECC. Journal of Civil & Environmental Engineering 4:2, 1000140. https://doi.org/10.4172/2165-784x.1000140.

DOI: 10.4172/2165-784x.1000140

[9] Sohaib, N., Seemab, F., Sana, G., Mamoon, R., 2018. Using polypropylene fibers in concrete to achieve maximum strength, in: Proc. Of the Eight Int. Conf. on Adv. in Civil and Structural Engineering. Presented at ACSEE 2018, Kuala Lumpur, Malaysia, pp.37-42.

DOI: 10.15224/978-1-63248-145-0-36

[10] Wolfs, R.J.M., 2019., Experimental characterization and numerical modelling of 3D printed concrete: controlling structural behaviour in the fresh and hardened state, Eindhoven University of Technology, Eindhoven, The Netherlands.