Synchronized concrete and bonding agent deposition system for interlayer bond strength enhancement in 3D concrete printing

Yiwei Weng, Mingyang Li (Corresponding Author), Teck Neng Wong, Ming Jen Tan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

A synchronized concrete and bonding agent deposition system is proposed to address the weak interlayer bond strength issue in extrusion-based 3D concrete printing (3DCP). In the proposed system, printable concrete and bonding agent are deposited concurrently via a rotatable nozzle with two outlets. Therefore, the interlayer bond strength is improved by the bonding agent deposited on the interface between printed filaments. Various bonding agents, including water, cement strengthener, polymer solution, and cement paste, were investigated. The results indicate that when the cement paste with a 0.26 water-to-cement mass ratio is adopted as the bonding agent, a relative bond strength as high as 267% can be obtained via the proposed system. Continuous printing was conducted to demonstrate that the proposed system has great potential for practical engineering applications. The proposed system has the potential to eliminate the weakness in interlayer bond strength of 3DCP processes and to widen 3DCP applications.

Original languageEnglish
Article number103546
JournalAutomation in Construction
Volume123
DOIs
Publication statusPublished - Mar 2021
Externally publishedYes

Keywords

  • 3D concrete printing
  • Additive manufacturing
  • Bonding agent
  • Interlayer bond strength
  • Synchronized system

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Civil and Structural Engineering
  • Building and Construction

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