Increasing noise pollution presents the challenge of integrating sustainable materials into building acoustics. Clay is investigated as an exemplary material – a traditional building material that is experiencing renewed interest today. While its hygrothermal properties are well studied, its acoustic potential in the context of sound absorption remains largely unexplored.

This thesis examines the potential of producing acoustic absorbers from clay using additive manufacturing. The aim is to develop a monomaterial, sustainable, and acoustically effective structure that requires no additional carrier materials or composites. A comprehensive literature review analyzed the current state of research on additively manufactured clay structures, the acoustic behavior of porous materials, and the influence of so-called tortuosity on sound absorption.

Based on this, geometric parameters were identified in the first part of the project that improve the acoustic performance of clay structures, including a wavy external contour, a microstructured surface with openings, and an internal highly porous geometry based on a growth-based algorithm. The developed geometry is based on alternating concave and convex base curves, forming a pocket-like structure arranged bead-like along a primary curve. This creates a silhouette with narrow vertical openings, allowing targeted reflection and attenuation of sound to the energetic minimum. At defined points, sound is absorbed through the developed porous growth pattern.

Computer simulations, impedance tube measurements, and reverberation chamber tests demonstrate the enhanced acoustic performance. The results highlight the potential of additively manufactured clay structures as a sustainable alternative to conventional acoustic solutions.