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

The article describes the assessment and optimization of a clay from a new quarry owned by an Egyptian company as a raw material for the manufacture of clay bricks. Various tests were conducted on representative samples of the raw clay to determine its particle size distribution, chemical composition, plasticity as well as its drying and firing behaviour. In addition, the effect of some additives (sand, reject fired bricks, that is grog, and sawdust) on the plasticity, drying and firing behaviour of the clay bodies was investigated.

1 Introduction

Clay bricks are made by shaping suitable clays and shales, mostly by extrusion of clay pastes to units of standard sizes, which are dried and fired to temperatures in the range of 750° C to 950° C. Clay deposits vary greatly in their mineralogical, chemical and particle size composition. This variation significantly affects their behaviour during forming, drying and firing. The green bricks have a considerable water content (20–35%). Excessive shrinkage of the shaped bricks, particularly during drying, poses the biggest challenge for obtaining crack-free products. It is therefore...

Related articles:

Issue 2021-04

1 Geological background and site Not far from the A4 motorway, around 20?km north of the town of Bautzen in Germany, lies the largest coherent kaolin deposit in the former GDR, with an operating area...

Issue 2022-04

1 Geological background and location At Henau Quarry, Taunus quartzite from the Lower Devonian is extracted and processed to high-quality aggregates and high-grade chippings. The material is used...

Issue 2017-2 EurGeol Dr. rer. nat. Lutz Krakow and Dipl.-Geol. Franziska Schunke

1 Global geology and tectonics After the Buntsandstein (Lower Triassic) and Muschelkalk (Middle Triassic), the Keuper (Upper Triassic) represents the third lithostratigraphic group of the German...

Issue 2018-2 Adolf Gottfried Tonwerke GmbH/Gottfried Feldspat GmbH | A6, 503

Working in close cooperation with its customers, Gottfried develops dedicated raw materials solutions. The range of raw and ground clays is selectively complemented with externally sourced raw...

Issue 2009-09 Raw material highlights for the brick and tile industry

1 Introduction The earthquake and tsunami on 26 December 2004 caused devastating destruction and damage to building structures in the province of Nanggroe Aceh Darussalam (NAD), on Northern Sumatra,...