Work

Selective Alkali Activation of Limestone for Additive Manufacturing in Construction: Influence of Alkali Concentration on Physical and Mechanical Properties

Year: 2025

Type: article

Abstract: Alkali-activated binders are gaining importance in the construction industry because of their environmental and mechanical advantages. This paper focuses on selective limestone activation (SLA) using aqueous sodium hydroxide solutions to be used as a non-hydraulic binder material. This study investigates the mechanical performance of 3D-printed specimens cured at 45 °C produced with different NaOH concentrations. Varying the NaOH concentration is significant for analyzing its role in optimizing the reactivity and mechanical behavior for additive manufacturing applications. The results show that mechanical strength and physical properties are influenced by the NaOH concentration, with the strength decreasing at higher sodium hydroxide loads. Although porosity and density are consistent in all concentrations, microstructure examination showed non-homogeneous grainy texture.

Source: Applied Sciences

DOI: 10.3390/app15084453

Authors: Mursaleen Shahid, Alexandre Pierre, Annelise Cousture, Vincenzo M. Sglavo

Institutions: University of Trento, CY Cergy Paris Université, Laboratoire de Mécanique et Matériaux du Génie Civil

Language: English

Topic: Innovations in Concrete and Construction Materials

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $2,896