Abstract

The real-time control of concrete's stiffening allows users to better control pumping and extrusion during 3D-printing processes. Here, a portlandite-based cementitious formulation (i.e., slurry or suspension) that features the potential for rapid CO2 uptake is adapted for 3D-printing applications. In particular, we showcase a portlandite-fly ash binder system combined with a thermo responsive polymer, wherein precise control via thermal activation allows set control and rapid solidification. Through the thermally induced polymerization of polyacrylamide, the hybrid binder system rapidly undergoes stiffening at trigger onset temperatures ranging from 60 °C to 80 °C, exhibiting average stiffening rates of up to 2600 Pa s−1. The addition of fly ash is noted to extend the open time, reduce the yield stress, and improve pumpability. The polymerization process contributes to initial strength gain. Subsequently, portlandite's carbonation and fly ash's pozzolanic reaction enhances mechanical strength. By combining set control and CO2 mineralization, this work pioneers the development of CO2-cured 3D-printed construction materials.

Department(s)

Materials Science and Engineering

Second Department

Civil, Architectural and Environmental Engineering

Publication Status

Full Text Access

Comments

Bayerisch-Kalifornischen Hochschulzentrum, Grant 1922167

Keywords and Phrases

3D-printing; Carbon dioxide mineralization; Cementitious formulation; Rheology; Thermoresponsive binder

International Standard Serial Number (ISSN)

0958-9465

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Elsevier, All rights reserved.

Publication Date

01 Sep 2025

Download

Full Text Link

Share

 
COinS