Abstract

Additive Manufacturing (AM) in the construction industry is still in a relative state of infancy. Research has focused on heavy, ground based methods, with the building envelope determined by the dimensions of the deposition system. By comparison, the approach of using robots is not geometrically restricted but requires a degree of miniaturisation to the deposition process. Many studies utilise the AM principal of fused deposition modelling (FDM), which creates an object by extruding a suitably viscous material through a nozzle and depositing one layer at a time. Crucial to the development of cementitious materials for additive building manufacturing (ABM) without formwork, is the material possessing both workability and buildability, and appropriately balancing the contrasting requirements of these properties. Cementitious materials
are typically brittle, requiring reinforcement to provide tensile and flexural capabilities. Reinforcing steel bars are not naturally compatible with ABM and chopped fibres are considered as a viable alternative. This paper investigates the development of a fibrous cementitious mortar suitable for use with a miniaturised deposition system based upon the FDM principal. Three types of fibres – polypropylene, alkali-resistant glass and polyvinyl alcohol (PVA) - were investigated to assess suitability for a miniaturised ABM deposition method and contributions to the mechanical strength of a mortar. PVA fibres provided the best buildability and increased flexural strength, with the appropriate quantity contained in mixes being informed by the degree of detrimental impact upon workability.
Original languageEnglish
Title of host publicationProceedings of the IOMMM 38th Cement and Concrete Science Conference
Subtitle of host publicationUniversity of Coventry
EditorsMark Tyrer
Place of PublicationUK
Volume38
ISBN (Electronic)ISBN 13 978-1-84600-088-1
Publication statusPublished - 10 Sep 2018

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Dams, B., Lumlerdwit, K., Shepherd, P., & Ball, R. (2018). Fibrous cementitious material development for additive building manufacturing. In M. Tyrer (Ed.), Proceedings of the IOMMM 38th Cement and Concrete Science Conference: University of Coventry (Vol. 38). UK.