Dipl.-Ing. (FH) Alexander Winkel M. Sc.

Production of sound-absorbing clay bricks with the
replica process

Photos/Fotos: Author/Autor

»1 Process flow of the replica process

Photos/Fotos: Author/Autor

»2 Light microscope image of the fully open-pore filter foam with 60 ppi (bottom) and the not fully open-pore foam with 60 ppi (top)

»3 Particle size distribution of the clays and glass flour used

»4 Influence of the particle size and of the glass flour on shrinkage at a firing temperature of 1000° C and a dwell time of 30 min

»5 Influence of the particle size and the glass flour on the bending strength

»6 Influence of the dispersant content on the viscosity at a shear rate of 1 s^-1

»7 Sound absorption of the foams used compared with the acoustic foam Basotect

»8 STA of the foam used

»9 Shrinkage of a round rod measured in a dilatometer and an infiltrated foam measured in a hot-stage microscope

»10 Light microscope image of the foam (top) and the foam brick produced from it (bottom)

»11 Sound absorption of the fired bricks
in various thicknesses

In a research project, sound-absorbing clay bricks were produced with the objective of reducing noise exposure in interior spaces. For this, the replica process was applied, in which high-porosity, organic bodies are infiltrated with a ceramic slurry and then dried and fired. This leaves an open-pored clay brick that replicates the basic organic structure 1:1.

1 Introduction

People’s exposure to noise is steadily increasing, and associated with this, health problems are rising with financial consequences.

For a reduction of the noise, in interior spaces porous sound absorbers are used. These convert the kinetic energy in the air into frictional heat. The absorbers consist mostly of organic materials, which, in event of a fire, present a potential hazard as they release gases that are hazardous to health.

The products currently offered by the clay brick industry for noise control cannot compete with commercial acoustic foams.

The objective of a...

Institut für Ziegelforschung Essen e.V.
www.izf.de

Issue 08/2014

Production of sound-absorbing clay bricks with the
replica process

1 Introduction

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Energy-conserving method for obtaining highly porous structures in brick clay

The potential of the replica technique for the clay brick and tile industry

Assessing the suitability of selected wastes as additives to clay bodies in brick manufacture

Formation of pores and voids during the end phase of drying green bricks with swelling additive content

Influence of pore geometry on the thermal insulation properties of porosified heavy clay blocks

1 Introduction

ZI 2/2019

ZI 2/2019

Related articles:

Energy-conserving method for obtaining highly porous structures in brick clay

The potential of the replica technique for the clay brick and tile industry

Assessing the suitability of selected wastes as additives to clay bodies in brick manufacture

Formation of pores and voids during the end phase of drying green bricks with swelling additive content

Influence of pore geometry on the thermal insulation properties of porosified heavy clay blocks