Lyla Lindsey
Bricks are a popular building material in Australia, renowned for their durability, aesthetic value, and load-bearing properties. The process of making bricks involves several stages, from the extraction of raw materials like clay to shaping, drying, and firing. In Australia, bricks are typically fired in one of three types of kilns: Down Draught, Hoffman, or Tunnel kilns. The firing process, during which bricks are baked at temperatures exceeding 1000°C, gives strength and durability to the final product. After firing, the bricks are cooled gradually, then undergo quality checks before being packaged and distributed for construction.
| Characteristics | Values |
|---|---|
| Primary Ingredient | Clay |
| Other Ingredients | Shale, silt, sand, gravel, stone |
| Binding Agents | Chopped straw, grasses, tree bark, dung |
| Firing Temperature | 1000-1200°C |
| Types of Kilns | Down Draught, Hoffman, Tunnel |
| Types of Bricks | Fired, unfired, chemically set, compressed earth blocks |
| Brick Durability | High |
| Brick Strength | High |
| Brick Colour | Depends on firing temperature |
| Brick Weight | Depends on type of brick |
| Brick Insulation | Not affected by holes |
| Brick Fire Resistance | Not affected by holes |
| Brick Use Case | Load-bearing, windowsills, door openings, retaining walls |
| Brick Grading | Exposure grade, general purpose, colour-through |
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What You'll Learn
Clay and shale are the primary ingredients
After the clay has been adequately prepared, water is added, and the mixture is left to mature, enhancing its plasticity for moulding. The process of moulding clay into bricks can be done by hand or by machine. Hand moulding is a traditional and labour-intensive method that involves manually pressing clay into wooden or metal moulds. Hand-moulded bricks often exhibit unique textures and slight variations, adding character to structures. Machine moulding, on the other hand, uses machines to extrude clay through a die, cutting it into bricks of uniform size and shape, making it more efficient and consistent for large-scale production.
The wet bricks are then dried to remove excess moisture before firing. This can be done through air drying, where bricks are stacked in well-ventilated areas, or kiln drying, where bricks are placed in drying chambers with controlled temperatures and humidity levels to reduce drying time. Firing is a critical stage where bricks are baked at temperatures exceeding 1000°C, transforming the clay into a hard and durable material. The firing process can be done in different types of kilns, such as Down Draught kilns, Hoffman kilns, and Tunnel kilns, with the temperature varying depending on the desired colour and aesthetic of the bricks.
After firing, the bricks are allowed to cool gradually to prevent thermal shock. Once cooled, they undergo quality checks for strength, size, and appearance before being packaged and distributed for construction projects. Bricks made from clay and shale are known for their durability and load-bearing properties, making them a popular building material in Australia.
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Extraction of raw materials
The first step in brick manufacturing is the extraction of raw materials. Clay, the primary ingredient in bricks, is sourced from quarries and transported to manufacturing facilities. This process involves using tools such as scrapers and shovels to extract the clay. Once the clay is obtained, it undergoes several preparation steps to ensure high-quality bricks with uniform characteristics.
The top layer of soil, or "unsoiling," is removed to eliminate any impurities and access pure clay. This step is crucial as it ensures the consistency and quality of the final product. After unsoiling, the cleaned clay is excavated and spread out to weather, allowing it to break down naturally.
The next step is the "digging" process, where the clay is extracted from the ground. Any stones, roots, or foreign materials are removed during this stage to maintain a consistent texture. Different types of clay may also be blended to achieve the desired properties for the bricks.
Once the clay is prepared, it is time for the moulding process. In Australia, two primary methods are used: hand moulding and machine moulding. Hand moulding is a traditional and labour-intensive process where clay is manually pressed into wooden or metal moulds. This method often results in unique textures and slight variations, adding character to the finished structure.
Machine moulding, on the other hand, uses modern machinery to extrude clay through a die, creating bricks of uniform size and shape. This method is highly efficient and consistent, making it ideal for large-scale production. After moulding, the wet bricks contain moisture that must be removed before firing.
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Firing and kiln types
Firing is the term used to describe the baking and setting of bricks after they have been shaped and dried. Bricks are fired at temperatures exceeding 1,000°C, with the temperature varying depending on the clay used and the desired aesthetic. Lighter bricks are fired at lower temperatures, while higher temperatures are used to produce darker colours.
The three basic types of kilns available in Australia are Down Draught kilns, Hoffman kilns, and Tunnel kilns. Tunnel kilns are modern kilns where bricks move through a long, tunnel-like chamber, experiencing gradual temperature changes for uniform firing. Post-firing, bricks are allowed to cool gradually to prevent thermal shock. Once cooled, they undergo quality checks for strength, size, and appearance before being packaged and distributed for construction projects.
Modern kilns use less energy and produce fewer emissions than their historical counterparts. For example, historic bricks used to build many DC rowhomes and buildings were fired in beehive kilns, which were dome-shaped to help distribute heat evenly. However, compared to modern kilns, these kilns were very ineffective at firing bricks evenly.
Kilns can be heated by electric heat sources, natural gas, or wood. In situations where less harsh temperatures are required, such as in an electric or natural gas kiln, more porous bricks, commonly known as "kiln bricks", are used. These bricks are weaker but much lighter and easier to form, and they insulate better than dense bricks. Dense fire bricks are used in applications with extreme conditions, such as the inside of a wood-fired kiln, where they are subject to high temperatures and abrasion from wood and ash.
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Hand moulding vs machine moulding
Bricks are a type of construction material used to build walls, pavements, and other elements in masonry construction. The earliest bricks were dried mud bricks, formed from clay-bearing earth or mud and dried in the sun. Modern, fired clay bricks are formed using one of three processes: soft mud, dry press, or extruded.
In Australia, two primary moulding methods are used to shape bricks: hand moulding and machine moulding. Hand moulding is a traditional and labour-intensive process that involves manually pressing clay into wooden or metal moulds. Hand-moulded bricks often have unique textures and slight variations, adding character to structures. However, this method is time-consuming and costly. To prevent moulded bricks from sticking to the moulds, sand is sprinkled on the inner sides of the mould, or the mould is dipped in water before moulding each brick. A moulder can produce between 500 to 1000 bricks per day using this method.
Machine moulding, on the other hand, is the predominant modern manufacturing method. It involves using machines to extrude clay through a die, cutting it into bricks of uniform size and shape. This method enhances efficiency and consistency in large-scale production. The extrusion method is the most commonly used type of machine moulding and produces wire-cut bricks. Machine-moulded bricks are stronger, more compact, and have sharp edges with smooth external surfaces. They are suitable for high-quality brickwork or positions where they will be subjected to great pressure.
Both hand moulding and machine moulding techniques are used in Australia's brick manufacturing industry, with machine moulding being more prevalent in modern times due to its efficiency and ability to produce a large number of bricks quickly.
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Recycled bricks
Bricks are a popular building material in Australia, valued for their durability, load-bearing properties, and aesthetic appeal. The traditional brick-making process involves several stages, from extracting and preparing the raw materials (primarily clay) to shaping, drying, firing, and quality checking.
However, there is a growing demand for recycled bricks in Australia, driven by environmental and sustainability concerns, as well as the historical and aesthetic value of older bricks. Recycled bricks are salvaged from demolished structures, cleaned, sorted, and repurposed for new construction projects. This practice helps reduce the environmental impact of new brick production and contributes to waste reduction and resource conservation.
Several companies in Australia specialise in recycled bricks, such as The Brick Pit, which has supplied recycled bricks for notable projects, including the University of Wollongong's Sustainable Buildings Research Centre, the first building in Australia to achieve Living Certification. Other suppliers include the Recycled Brick Centre in Sydney, which offers a wide range of antique, second-hand, and salvaged bricks, and Richies Recycled Bricks in Canberra, which provides a salvage, cleaning, and stacking service for existing house bricks.
Architects and builders across Australia are embracing the use of recycled bricks, incorporating them into new constructions, feature walls, fireplaces, and other design elements to create unique and sustainable spaces.
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Frequently asked questions
Clay is the primary ingredient in bricks, with other raw materials such as shale, silt, sand, gravel, and stone also being used.
There are four basic types of bricks: unfired, fired, chemically set, and compressed earth blocks. Other types of bricks include exposure grade bricks, general-purpose bricks, and solid bricks.
Bricks are a popular and preferred building material for Australian homeowners and have been used for decades. They are used for residential and commercial projects.
The process of making bricks in Australia involves several stages. First, raw materials like clay are extracted and transported to manufacturing facilities. The clay is then prepared through unsoiling, digging, cleaning, blending, and tempering. After that, the clay is shaped into bricks through hand moulding or machine moulding. The bricks are then dried through air drying or kiln drying before being fired in a kiln at temperatures exceeding 1,000°C. Finally, the bricks are cooled, quality checked, and packaged for distribution.
