resumo
The reduction of noise pollution in buildings, a critical global public health concern, demands the development of novel acoustic barriers that meet with the sustainability requirements envisioned for future building materials. Herein, additive manufacturing was explored to develop 3D-printed geopolymer structures combining high porosity, mechanical strength, and remarkable acoustic properties, a pioneering study in this area. The results demonstrate that lattice design can effectively tailor the acoustic performance of these novel materials. A 21-mm thick structure with filaments rotated by 45 degrees between layers exhibited an impressive sound absorption coefficient across the studied frequency range (alpha reaching 0.90 at 3150 Hz) alongside a compressive strength (6.9 MPa). In contrast, a structure with filaments rotated by 90 degrees showed slightly lower sound absorption performance (alpha = 0.84) but significantly higher strength (12.6 MPa). These promising findings could pave the way for the broader use of environmentally conscious geopolymers in acoustic applications.
palavras-chave
FLY-ASH; LIGHTWEIGHT AGGREGATE; SOUND-ABSORPTION; INSULATION; CONCRETE; CONSTRUCTION; FOAM
categoria
Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
autores
Pereira, CM; Vieira, H; Gonçalves, NPF; Ascensao, G; Novais, RM
nossos autores
Carolina Matias Pereira
Estudante de mestrado
Guilherme Ascensão
Bolseiro de investigação
Nuno Gonçalves
Investigador Júnior
Rui Miguel Novais
Professor AuxiliarGrupos
G1 - Materiais Porosos e Nanossistemas
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020) , UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) , financed by national funds through the FCT/MCTES (PIDDAC) . G. Ascensao acknowledge the financial support of the Foundation for Science and Technology (FCT) through the project UIDB/04625/2025 of the research unit CERIS.