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A brick is a type of construction material used to build walls, pavements and other elements in masonry construction. Properly, the term brick denotes a unit primarily composed of clay. But is now also used informally to denote building units made of other materials or other chemically cured construction blocks. Bricks can be joined using mortar, adhesives or by interlocking. Bricks are usually produced at brickworks in numerous classes, types, materials, and sizes which vary with region, and are produced in bulk quantities.
Block is a similar term referring to a rectangular building unit composed of clay or concrete, but is usually larger than a brick. Lightweight bricks (also called lightweight blocks) are made from expanded clay aggregate. Fired bricks are one of the longest-lasting and strongest building materials, sometimes referred to as artificial stone, and have been used since . Air-dried bricks, also known as , have a history older than fired bricks, and have an additional ingredient of a mechanical binder such as straw.
Bricks are laid in courses and numerous patterns known as bonds, collectively known as brickwork, and may be laid in various kinds of mortar to hold the bricks together to make a durable structure.
Mudbrick construction was used at Çatalhöyük, from c. 7,400 BC.
Mudbrick structures, dating to c. 7,200 BC have been located in Jericho, Jordan Valley. These structures were made up of the first bricks with dimension 400x150x100 mm.
Between 5000 and 4500 BC, Mesopotamia had discovered fired brick. The standard brick sizes in Mesopotamia followed a general rule: the width of the dried or burned brick would be twice its thickness, and its length would be double its width.
The inhabitants of Mehrgarh also constructed air-dried mudbrick structures between 7000 and 3300 BCPossehl, Gregory L. (1996) and later the ancient Indus Valley cities of Mohenjo-daro, Harappa, History of brickmaking, Encyclopædia Britannica. and Mehrgarh. Ceramic, or fired brick was used as early as 3000 BC in early Indus Valley cities like Kalibangan.
In the middle of the third millennium BC, there was a rise in monumental baked brick architecture in Indus cities. Examples included the Great Bath, the fire altars of Kalibangan, and the granary of Harappa. There was a uniformity to the brick sizes throughout the Indus Valley region, conforming to the 1:2:4, thickness, width, and length ratio. As the Indus civilization began its decline at the start of the second millennium BC, Harappans migrated east, spreading their knowledge of brickmaking technology. This led to the rise of cities like Pataliputra, Kosambi, and Ujjain, where there was an enormous demand for kiln-made bricks.
By 604 BC, bricks were the construction materials for architectural wonders such as the Hanging Gardens of Babylon, where glazed fired bricks were put into practice.
According to Lukas Nickel, the use of ceramic pieces for protecting and decorating floors and walls dates back at various cultural sites to 3000-2000 BC and perhaps even before, but these elements should be rather qualified as . For the longest time builders relied on wood, mud and rammed earth, while fired brick and mudbrick played no structural role in architecture. Proper brick construction, for erecting walls and vaults, finally emerges in the third century BC, when baked bricks of regular shape began to be employed for vaulting underground tombs. Hollow brick tomb chambers rose in popularity as builders were forced to adapt due to a lack of readily available wood or stone.Lukas Nickel: Bricks in Ancient China and the Question of Early Cross-Asian Interaction, Arts Asiatiques, Vol. 70 (2015), pp. 49-62 (50f.) The oldest extant brick building above ground is possibly Songyue Pagoda, dated to 523 AD.
By the end of the third century BC in China, both hollow and small bricks were available for use in building walls and ceilings. Fired bricks were first mass-produced during the construction of the tomb of China's first Emperor, Qin Shi Huangdi. The floors of the three pits of the Terracotta Army were paved with an estimated 230,000 bricks, with the majority measuring 28x14x7 cm, following a 4:2:1 ratio. The use of fired bricks in Chinese city walls first appeared in the Han dynasty (25 AD-220 AD). Up until the Middle Ages, buildings in Central Asia were typically built with unbaked bricks. It was only starting in the ninth century CE when buildings were entirely constructed using fired bricks.
The carpenter's manual Yingzao Fashi, published in 1103 at the time of the Song dynasty described the brick making process and Ceramic glaze techniques then in use. Using the 17th-century encyclopaedic text Song Yingxing, historian Timothy Brook outlined the brick production process of Ming dynasty China:
During the Early Middle Ages the use of bricks in construction became popular in Northern Europe, after being introduced there from Northwestern Italy. An independent style of brick architecture, known as brick Gothic (similar to Gothic architecture) flourished in places that lacked indigenous sources of rocks. Examples of this architectural style can be found in modern-day Denmark, Germany, Poland, and Kaliningrad (former East Prussia).
This style evolved into the Brick Renaissance as the stylistic changes associated with the Italian Renaissance spread to northern Europe, leading to the adoption of Renaissance elements into brick building. Identifiable attributes included a low-pitched hipped or flat roof, symmetrical facade, round arch entrances and windows, columns and pilasters, and more.
A clear distinction between the two styles only developed at the transition to Baroque architecture. In Lübeck, for example, Brick Renaissance is clearly recognisable in buildings equipped with terracotta reliefs by the artist Statius von Düren, who was also active at Schwerin (Schwerin Castle) and Wismar (Fürstenhof).
Long-distance bulk transport of bricks and other construction equipment remained prohibitively expensive until the development of modern transportation infrastructure, with the construction of canal, , and .
The transition from the traditional method of production known as hand-moulding to a mechanised form of mass-production slowly took place during the first half of the nineteenth century. The first brick-making machine was by Richard A. Ver Valen of Haverstraw, New York, in 1852. The Bradley & Craven Ltd 'Stiff-Plastic Brickmaking Machine' was patented in 1853. Bradley & Craven went on to be a dominant manufacturer of brickmaking machinery. The First Hundred Years: the Early History of Bradley & Craven, Limited, Wakefield, England by Bradley & Craven Ltd (1963) Henry Clayton, employed at the Atlas Works in Middlesex, England, in 1855, patented a brick-making machine that was capable of producing up to 25,000 bricks daily with minimal supervision. His mechanical apparatus soon achieved widespread attention after it was adopted for use by the South Eastern Railway Company for brick-making at their factory near Folkestone.
At the end of the 19th century, the Hudson River region of New York State would become the world's largest brick manufacturing region, with 130 brickyards lining the shores of the Hudson River from Mechanicsville to Haverstraw and employing 8,000 people. At its peak, about 1 billion bricks were produced a year, with many being sent to New York City for use in its construction industry.
The demand for high office building construction at the turn of the 20th century led to a much greater use of cast iron and wrought iron, and later, steel and concrete. The use of brick for skyscraper construction severely limited the size of the building – the Monadnock Building, built in 1896 in Chicago, required exceptionally thick walls to maintain the structural integrity of its 17 storeys.
Following pioneering work in the 1950s at the ETH Zurich and the Building Research Establishment in Watford, UK, the use of improved masonry for the construction of tall structures up to 18 storeys high was made viable. However, the use of brick has largely remained restricted to small to medium-sized buildings, as steel and concrete remain superior materials for high-rise construction.
The ingredients are first harvested and added together, with clay content ranging from 30% to 70%. The mixture is broken up with hoes or , and stirred with water to form a homogenous blend. Next, the tempers and binding agents are added in a ratio, roughly one part straw to five parts earth to reduce weight and reinforce the brick by helping reduce shrinkage. However, additional clay could be added to reduce the need for straw, which would prevent the likelihood of insects deteriorating the organic material of the bricks, subsequently weakening the structure. These ingredients are thoroughly mixed together by hand or by treading and are then left to ferment for about a day.
The mix is then kneaded with water and molded into rectangular prisms of a desired size. Bricks are lined up and left to dry in the sun for three days on both sides. After the six days, the bricks continue drying until required for use. Typically, longer drying times are preferred, but the average is eight to nine days spanning from initial stages to its application in structures. Unfired bricks could be made in the spring months and left to dry over the summer for use in the autumn. Mudbricks are commonly employed in arid environments to allow for adequate air drying.
Clay and shale are the raw ingredients in the recipe for a fired brick. They are the product of thousands of years of decomposition and erosion of rocks, such as pegmatite and granite, leading to a material that has properties of being highly chemically stable and inert. Within the clays and shales are the materials of aluminosilicate (pure clay), free silica (quartz), and decomposed rock.
The other major kiln type is the Bull's Trench Kiln (BTK), based on a design developed by British engineer W. Bull in the late 19th century.
An oval or circular trench is dug, wide, deep, and in circumference. A tall exhaust chimney is constructed in the centre. Half or more of the trench is filled with "green" (unfired) bricks which are stacked in an open lattice pattern to allow airflow. The lattice is capped with a roofing layer of finished brick.
In operation, new green bricks, along with roofing bricks, are stacked at one end of the brick pile. Historically, a stack of unfired bricks covered for protection from the weather was called a "hack".Connolly, Andrew. Life in the Victorian Brickyards of Flintshire and Denbigshire, p34. 2003, Gwasg Carreg Gwalch. Cooled finished bricks are removed from the other end for transport to their destinations. In the middle, the brick workers create a firing zone by dropping fuel (coal, wood, oil, debris, etc.) through access holes in the roof above the trench. The constant source of fuel maybe grown on the .
The advantage of the BTK design is a much greater energy efficiency compared with clamp kiln or . Sheet metal or boards are used to route the airflow through the brick lattice so that fresh air flows first through the recently burned bricks, heating the air, then through the active burning zone. The air continues through the green brick zone (pre-heating and drying the bricks), and finally out the chimney, where the rising gases create suction that pulls air through the system. The reuse of heated air yields savings in fuel cost.
As with the rail process, the BTK process is continuous. A half-dozen labourers working around the clock can fire approximately 15,000–25,000 bricks a day. Unlike the rail process, in the BTK process the bricks do not move. Instead, the locations at which the bricks are loaded, fired, and unloaded gradually rotate through the trench.Pakistan Environmental Protection Agency, Brick Kiln Units (PDF file)
An impervious and ornamental surface may be laid on brick either by salt glazing, in which salt is added during the burning process, or by the use of a slip, which is a glaze material into which the bricks are dipped. Subsequent reheating in the kiln fuses the slip into a glazed surface integral with the brick base.
Concrete bricks are available in many colours and as an engineering brick made with sulfate-resisting Portland cement or equivalent. When made with adequate amount of cement they are suitable for harsh environments such as wet conditions and retaining walls. They are made to standards BS 6073, EN 771-3 or ASTM C55. Concrete bricks contract or shrink so they need movement joints every 5 to 6 metres, but are similar to other bricks of similar density in thermal and sound resistance and fire resistance.
Categorized by manufacture method:
Categorized by use:
Specialized use bricks:
Bricks named for place of origin:
A bigger brick makes for a thicker (and thus more insulating) wall. Historically, this meant that bigger bricks were necessary in colder climates (see for instance the slightly larger size of the Russian brick in table below), while a smaller brick was adequate, and more economical, in warmer regions. A notable illustration of this correlation is the Green Gate in Gdansk; built in 1571 of imported Dutch brick, too small for the colder climate of Gdansk, it was notorious for being a chilly and drafty residence. Nowadays this is no longer an issue, as modern walls typically incorporate specialised insulation materials.
The correct brick for a job can be selected from a choice of colour, surface texture, density, weight, absorption, and pore structure, thermal characteristics, thermal and moisture movement, and fire resistance.
| +Face brick ("house brick") sizes, (alphabetical order) !Standard !!Metric (mm) !!Imperial (inches) !Ratio | |
| 3:1.4:1 | |
| 4.5:2.9:1 | |
| 4.3:2:1 | |
| 3.4:1.6:1 | |
| 3.3:1.6:1 | |
| 3.5:1.6:1 | |
| 3.8:1.8:1 | |
| 3.8:1.8:1 | |
| 3:1.4:1 | |
| 4.1:2:1 | |
| 3.3:1.5:1 | |
| 3.5:1.6:1 |
In England, the length and width of the common brick remained fairly constant from 1625 when the size was regulated by statute at 9 x x 3 inches (but see brick tax), but the depth has varied from about or smaller in earlier times to about more recently. In the United Kingdom, the usual size of a modern brick (from 1965) is , which, with a nominal mortar joint, forms a unit size of , for a ratio of 6:3:2.
In the United States, modern standard bricks are specified for various uses;[4] . Brick Industry Association. Technical Note 9A, Specifications for and Classification of Brick. Retrieved 28 December 2016. The most commonly used is the modular brick has the actual dimensions of × × inches (194 × 92 × 57 mm). With the standard inch mortar joint, this gives the nominal dimensions of 8 x 4 x inches which eases the calculation of the number of bricks in a given wall.[5] bia.org. Technical Note 10, Dimensioning and Estimating Brick Masonry (pdf file) Retrieved 8 November 2016. The 2:1 ratio of modular bricks means that when they turn corners, a 1/2 running bond is formed without needing to cut the brick down or fill the gap with a cut brick; and the height of modular bricks means that a soldier course matches the height of three modular running courses, or one standard CMU course.
Some brickmakers create innovative sizes and shapes for bricks used for plastering (and therefore not visible on the inside of the building) where their inherent mechanical properties are more important than their visual ones. Crammix Maxilite. crammix.co.za These bricks are usually slightly larger, but not as large as blocks and offer the following advantages:
Blocks have a much greater range of sizes. Standard co-ordinating sizes in length and height (in mm) include 400×200, 450×150, 450×200, 450×225, 450×300, 600×150, 600×200, and 600×225; depths (work size, mm) include 60, 75, 90, 100, 115, 140, 150, 190, 200, 225, and 250. They are usable across this range as they are lighter than clay bricks. The density of solid clay bricks is around 2000 kg/m3: this is reduced by frogging, hollow bricks, and so on, but aerated autoclaved concrete, even as a solid brick, can have densities in the range of 450–850 kg/m3.
Bricks may also be classified as solid (less than 25% perforations by volume, although the brick may be "frogged," having indentations on one of the longer faces), perforated (containing a pattern of small holes through the brick, removing no more than 25% of the volume), cellular (containing a pattern of holes removing more than 20% of the volume, but closed on one face), or hollow (containing a pattern of large holes removing more than 25% of the brick's volume). Blocks may be solid, cellular or hollow.
The term "frog" can refer to the indentation or the implement used to make it. Modern brickmakers usually use plastic frogs but in the past they were made of wood.
The compressive strength of bricks produced in the United States ranges from about , varying according to the use to which the brick are to be put. In England clay bricks can have strengths of up to 100 MPa, although a common house brick is likely to show a range of 20–40 MPa.
In the United States, bricks have been used for both buildings and pavement. Examples of brick use in buildings can be seen in colonial era buildings and other notable structures around the country. Bricks have been used in paving roads and sidewalks especially during the late 19th century and early 20th century. The introduction of asphalt and concrete reduced the use of brick for paving, but they are still sometimes installed as a method of traffic calming or as a decorative surface in pedestrian precincts. For example, in the early 1900s, most of the streets in the city of Grand Rapids, Michigan, were paved with bricks. Today, there are only about 20 blocks of brick-paved streets remaining (totalling less than 0.5 percent of all the streets in the city limits). Michigan | Success Stories | Preserve America | Office of the Secretary of Transportation | U.S. Department of Transportation. Much like in Grand Rapids, municipalities across the United States began replacing brick streets with inexpensive asphalt concrete by the mid-20th century.
In Northwest Europe, bricks have been used in construction for centuries. Until recently, almost all houses were built almost entirely from bricks. Although many houses are now built using a mixture of and other materials, many houses are skinned with a layer of bricks on the outside for aesthetic appeal.
Bricks in the metallurgy and glass industries are often used for lining furnaces, in particular refractory bricks such as silica, Periclase, chamotte and neutral (chromomagnesite) fire brick. This type of brick must have good thermal shock resistance, refractoriness under load, high melting point, and satisfactory porosity. There is a large refractory brick industry, especially in the United Kingdom, Japan, the United States, Belgium and the Netherlands.
Engineering bricks are used where strength, low water porosity or acid (flue gas) resistance are needed.
In the UK a red brick university is one founded in the late 19th or early 20th century. The term is used to refer to such institutions collectively to distinguish them from the older Oxbridge institutions, and refers to the use of bricks, as opposed to stone, in their buildings.
Colombian architect Rogelio Salmona was noted for his extensive use of red bricks in his buildings and for using natural shapes like spirals, radial geometry and curves in his designs.
Some US jurisdictions, such as San Francisco, have taken steps to remove brick sidewalks from certain areas such as Market Street in order to improve accessibility.
== Gallery ==
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![Decorative bricks in St Michael and All Angels Church, Blantyre, MalawiVirgilio Barco Public Library, Bogotá, ColombiaBrick sidewalk paving in Portland, Oregon, U.S.Brick sidewalk in Cambridge, Massachusetts, U.S.Porotherm style clay block brickMoulding bricks, Poland, Taiwan.]] See also Further reading Hudson, Kenneth (1972) Building Materials; chap. 3: Bricks and tiles. London: Longman; pp. 28–42 External links Brick in 20th-Century Architecture Brick Industry Association United States Brick Development Association UK Think Brick Australia International Brick Collectors Association Categories: Building Materials, Masonry, Soil-based Building Materials Page 1 of 1 1 Page 1 of 1 1](http://www.upcscavenger.com/wiki/Lopen uusi kirkko.jpg/){kind=link}
![Decorative bricks in St Michael and All Angels Church, Blantyre, MalawiVirgilio Barco Public Library, Bogotá, ColombiaBrick sidewalk paving in Portland, Oregon, U.S.Brick sidewalk in Cambridge, Massachusetts, U.S.Porotherm style clay block brickMoulding bricks, Poland, Taiwan.]] See also Further reading Hudson, Kenneth (1972) Building Materials; chap. 3: Bricks and tiles. London: Longman; pp. 28–42 External links Brick in 20th-Century Architecture Brick Industry Association United States Brick Development Association UK Think Brick Australia International Brick Collectors Association Categories: Building Materials, Masonry, Soil-based Building Materials Page 1 of 1 1 Page 1 of 1 1](http://www.upcscavenger.com/wiki/Rieten dak old farmhouse.jpg/){kind=link}
![Brick sidewalk paving in Portland, Oregon, U.S.Brick sidewalk in Cambridge, Massachusetts, U.S.Porotherm style clay block brickMoulding bricks, Poland, Taiwan.]] See also Further reading Hudson, Kenneth (1972) Building Materials; chap. 3: Bricks and tiles. London: Longman; pp. 28–42 External links Brick in 20th-Century Architecture Brick Industry Association United States Brick Development Association UK Think Brick Australia International Brick Collectors Association Categories: Building Materials, Masonry, Soil-based Building Materials Page 1 of 1 1 Page 1 of 1 1](http://www.upcscavenger.com/wiki/Maria Claudia Cali edificio FES.jpg/){kind=link}
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