Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31903
Optimization of Hemp Fiber Reinforced Concrete for Mix Design Method

Authors: Zoe Chang, Max Williams, Gautham Das

Abstract:

The purpose of this study is to evaluate the incorporation of hemp fibers (HF) in concrete. Hemp fiber reinforced concrete (HFRC) is becoming more popular as an alternative for regular mix designs. This study was done to evaluate the compressive strength of HFRC regarding mix procedure. HF were obtained from the manufacturer and hand processed to ensure uniformity in width and length. The fibers were added to concrete as both wet and dry mix to investigate and optimize the mix design process. Results indicated that the dry mix had a compressive strength of 1157 psi compared to the wet mix of 985 psi. This dry mix compressive strength was within range of the standard mix compressive strength of 1533 psi. The statistical analysis revealed that the mix design process needs further optimization and uniformity concerning the addition of HF. Regression analysis revealed that the standard mix design had a coefficient of 0.9 as compared to the dry mix of 0.375 indicating a variation in the mixing process. While completing the dry mix, the addition of plain HF caused them to intertwine creating lumps and inconsistency. However, during the wet mixing process, combining water and HF before incorporation allows the fibers to uniformly disperse within the mix hence the regression analysis indicated a better coefficient of 0.55. This study concludes that HRFC is a viable alternative to regular mixes however more research surrounding its characteristics needs to be conducted.

Keywords: hemp fibers, hemp reinforced concrete, wet and dry, freeze thaw testing, compressive strength

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 289

References:


[1] X. Zhou, H. Saini, and G. Kastiukas. “Engineering Properties of Treated Natural Hemp Fiber-Reinforced Concrete”. Frontiers in Built Environment., June 2017, 3, 33, pp. 1.
[2] A. Shahzad. “A Study in Physical and Mechanical Properties of Hemp Fibres.” Advances in Materials Science and Engineering, 26 Aug. 2013, 10.1155/2013/325085.
[3] Z. Li, X. Wang, and L. Wang. “Properties of Hemp Fibre Reinforced Concrete Composites.” Composites Part A: Applied Science and Manufacturing, vol. 37. March 2006, 37. 497-505. 10.1016/j.compositesa.2005.01.032.
[4] World Cement Association. “History of Cement.” 2021 www.worldcementassociation.org/about-cement/our-history.
[5] International Energy Association. “Global Cement Production, 2010-2019 – Charts – Data & Statistics.” IEA. May 2020, www.iea.org/data-and-statistics/charts/global-cement-production-2010-2019
[6] A. Talaat, A. Emad, A. Tarek, M. Masbouba, A. Essam, and M. Kohail. “Factors Affecting the Results of Concrete Compression Testing: A Review.” Ain Shams Engineering Journal., September 2020, 12. 10.1016/j.asej.2020.07.015.
[7] P. Linger, J. Müssig, H. Fischer, J. Kobert. “Industrial Hemp (Casnnabis sativa L.) Growing on Heavy Metal Contaminated Soil: Fibre Quality and Phytoremediation Potential.” Industrial Crops and Products., December 2002 vol. 16, no. 1, 2002, pp. 33–42., doi:10.1016/s0926-6690(02)00005-5.