3D printing of geopolymer-based concrete for building applications. Issue 10 (24th September 2020)

• Record Type: Journal Article
• Authors: Ur Rehman, Asif; Sglavo, Vincenzo M.
• Is Part Of: Rapid prototyping journal. Volume 26:Issue 10(2020)
• Page Start: 1783
• Page End: 1788
• Publication Date: 2020-09-24
• Subjects: 3D printing -- Dimensional accuracy -- Layer thickness -- Mechanical strength -- Surface quality -- Binder saturation; Engineering design -- Periodicals; 620.004205
• DOI: 10.1108/RPJ-09-2019-0244
• Languages: English
• ISSNs: 1355-2546

Abstract

Abstract : Purpose: Three-dimensional (3D) printing technology allows geometric complexity and customization with a significant reduction in the structural environmental impact. Nevertheless, it poses a serious threat to the environment when organic binders are used. Binder jet printing of alkali-activated geopolymer precursor can represent a successful and environmental-friendly alternative. Design/methodology/approach: The present work reports about the successful 3D printing of metakaolin-based alkali-activated concrete, with dimensional integrity and valuable mechanical behavior. Findings: The geometric behavior was studied as a function of alkali activator flow rate, and the minimum geometric deviation with complete saturation was recorded at 103 mg/s. The printed specimen is characterized by a modulus of rupture as high as 4.4 MPa at 135 mg/s. Practical implications: The 3D printed geopolymer-based concrete can be potentially used in a wide range of structural applications from construction to thermal insulation elements. Originality/value: The analysis of the 3D geopolymer-based concrete printing system and material conducted in this paper is original.