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Mortar (masonry)
Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly, and sometimes to add decorative colours or patterns to masonry walls. In its broadest sense, mortar includes pitch, asphalt, and soft clay, as those used between bricks, as well as cement mortar. The word "mortar" comes from the Old French word ''mortier'', "builder's mortar, plaster; bowl for mixing." (13c.). Cement mortar becomes hard when it cures, resulting in a rigid aggregate (composite) , aggregate structure; however, the mortar functions as a weaker component than the building blocks and serves as the sacrificial element in the masonry, because mortar is easier and less expensive to repair than the building blocks. Bricklayers typically make mortars using a mixture of sand, a binder, and water. The most common binder since the early 20th century is Portland cement, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three Old Bricks Held Together With Mortar
3 (three) is a number, numeral (linguistics), numeral and numerical digit, digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies. Evolution of the Arabic digit The use of three lines to denote the number 3 occurred in many writing systems, including some (like Roman and Chinese numerals) that are still in use. That was also the original representation of 3 in the Brahmic numerals, Brahmic (Indian) numerical notation, its earliest forms aligned vertically. However, during the Gupta Empire the sign was modified by the addition of a curve on each line. The Nāgarī script rotated the lines clockwise, so they appeared horizontally, and ended each line with a short downward stroke on the right. In cursive script, the three strokes were eventually connected to form a glyph resembling a with an additional stroke at the bottom: ३. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plaster Of Paris
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of buildings, while "render" commonly refers to external applications. The term stucco refers to plasterwork that is worked in some way to produce relief decoration, rather than flat surfaces. The most common types of plaster mainly contain either gypsum, lime, or cement,Franz Wirsching "Calcium Sulfate" in Ullmann's Encyclopedia of Industrial Chemistry, 2012 Wiley-VCH, Weinheim. but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through crystallization and the hydrated plaster then hardens. Plaster can be relatively easily worked with metal tools and sandpaper and can be moulded, either ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gypsum
Gypsum is a soft sulfate mineral composed of calcium sulfate Hydrate, dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk. Gypsum also Crystallization, crystallizes as translucent crystals of selenite (mineral), selenite. It forms as an evaporite mineral and as a Mineral hydration, hydration product of anhydrite. The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on Scratch hardness, scratch hardness comparison. Fine-grained white or lightly tinted forms of gypsum known as alabaster have been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England. Etymology and history The word ''wikt:gypsum, gypsum'' is derived from the Greek language, Greek word (), "plaster". Because the quarry, quarries of the Montmartre district of P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indus Valley Civilization
The Indus Valley Civilisation (IVC), also known as the Indus Civilisation, was a Bronze Age civilisation in the northwestern regions of South Asia, lasting from 3300 BCE to 1300 BCE, and in its mature form from 2600 BCE to 1900 BCE. Together with ancient Egypt and Mesopotamia, it was one of three early civilisations of the Near East and South Asia, and of the three, the most widespread, its sites spanning an area including much of Pakistan, northwestern India and northeast Afghanistan. The civilisation flourished both in the alluvial plain of the Indus River, which flows through the length of Pakistan, and along a system of perennial monsoon-fed rivers that once coursed in the vicinity of the Ghaggar-Hakra, a seasonal river in northwest India and eastern Pakistan. The term ''Harappan'' is sometimes applied to the Indus Civilisation after its type site Harappa, the first to be excavated early in the 20th century in what was then the Punjab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Subcontinent
The Indian subcontinent is a physiographic region of Asia below the Himalayas which projects into the Indian Ocean between the Bay of Bengal to the east and the Arabian Sea to the west. It is now divided between Bangladesh, India, and Pakistan. (subscription required) Although the terms "Indian subcontinent" and "South Asia" are often also used interchangeably to denote a wider region which includes, in addition, Bhutan, the Maldives, Nepal and Sri Lanka, the "Indian subcontinent" is more of a geophysical term, whereas "South Asia" is more geopolitical. "South Asia" frequently also includes Afghanistan, which is not considered part of the subcontinent even in extended usage.Jim Norwine & Alfonso González, ''The Third World: states of mind and being'', pages 209, Taylor & Francis, 1988, Quote: ""The term "South Asia" also signifies the Indian Subcontinent""Raj S. Bhopal, ''Ethnicity, race, and health in multicultural societies'', pages 33, Oxford University Press, 2007, ; Q ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudbrick
Mudbrick or mud-brick, also known as unfired brick, is an air-dried brick, made of a mixture of mud (containing loam, clay, sand and water) mixed with a binding material such as rice husks or straw. Mudbricks are known from 9000 BCE. From around 5000–4000 BCE, mudbricks evolved into Brick#Fired brick, fired bricks to increase strength and durability. Nevertheless, in some warm regions with very little timber available to fuel a kiln, mudbricks continued to be in use. Even today, mudbricks are the standard of vernacular architecture in some warmer regions- mainly in parts of Africa and western Asia. In the 20th century, the compressed earth block was developed using high pressure as a cheap and eco-friendly alternative to obtain non-fired bricks with more strength than the simpler air-dried mudbricks. Ancient world The history of mudbrick production and construction in the southern Levant may be dated as far back to the Pre-Pottery Neolithic A (e.g., PPNA Jericho). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baluchistan
Balochistan ( ; , ), also spelled as Baluchistan or Baluchestan, is a historical region in West and South Asia, located in the Iranian plateau's far southeast and bordering the Indian Plate and the Arabian Sea coastline. This arid region of desert and mountains is primarily populated by ethnic Baloch people. The Balochistan region is split among three countries: Iran, Afghanistan and Pakistan. Administratively it comprises the Pakistani province of Balochistan, the Iranian province of Sistan and Baluchestan, and the southern areas of Afghanistan, which include Nimruz, Helmand and Kandahar provinces. It borders the Pashtunistan region to the north, Sindh and Punjab to the east, and Persian regions to the west. Its southern coastline, including the Makran Coast, is washed by the Arabian Sea, in particular by its western part, the Gulf of Oman. Etymology The name "Balochistan" is generally believed to derive from the name of the Baloch people. Since the Baloch people are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mehrgarh
Mehrgarh is a Neolithic archaeological site situated on the Kacchi Plain of Balochistan, Pakistan, Balochistan in Pakistan. It is located near the Bolan Pass, to the west of the Indus River and between the modern-day Pakistani cities of Quetta, Kalat, Pakistan, Kalat and Sibi. The site was discovered in 1974 by the French Archaeological Mission led by the French people, French archaeologists Jean-François Jarrige and Catherine Jarrige (archaeologist), Catherine Jarrige. Mehrgarh was Archaeological excavation, excavated continuously between 1974 and 1986, and again from 1997 to 2000. Archaeological material has been found in six mounds, and about 32,000 artifacts have been collected from the site. The earliest settlement at Mehrgarh, located in the northeast corner of the site, was a small farming village dated between 7000 BCE and 5500 BCE. History Mehrgarh is one of the earliest known sites in South Asia showing evidence of farming and herding.UNESCO World Heritage. 2004. ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roman Ghirshman
Roman Ghirshman (, ''Roman Mikhailovich Girshman''; October 3, 1895 – 5 September 1979) was a Ukrainian-born French archeologist who specialized in ancient Persia. Ghirshman spent nearly thirty years excavating ancient Persian archeological sites throughout Iran and Afghanistan. Biography Roman Ghirshman was born to a wealthy Jewish family in Kharkiv in the Sloboda Ukraine (present-day Ukraine) in 1895. Ghirshman moved to Paris in 1917 to study Archeology and Ancient Languages. He was mainly interested in the archeological ruins of Iran, specifically Tepe Giyan, Teppe Sialk, Bagram in Afghanistan, Bishapur in Fars, and Susa. In the 1930s, Girshman, together with his wife Tania Ghirshman, was the first to excavate Teppe Sialk. His studies on Chogha Zanbil have been printed in 4 volumes, and he also led excavation teams at Kharg Island, Iwan-i Karkheh, and the Parthian platforms in Masjed Soleiman, near Izeh, Khuzestan. From 1941 to 1942 he was Director of the F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ganj Dareh
Ganj Dareh ( Persian: تپه گنج دره; "Treasure Valley" in Persian, or "Treasure Valley Hill" if tepe/tappeh (hill) is appended to the name) is a Neolithic settlement in western Iran. It is located in the Harsin County in east of Kermanshah Province, in the central Zagros Mountains. Research history First discovered in 1965, it was excavated by Canadian archaeologist Philip Smith during the 1960s and 1970s, for four field seasons. In 2017 or 2018, the site was revisited by an Iranian-Danish team of archaeologists under direction of Hojjat Darabi and Tobias Richter. The oldest settlement remains on the site date back to c. 8200 BC, and have yielded the earliest evidence for goat domestication in the world.What's Bred in the Bone '' |
Jericho
Jericho ( ; , ) is a city in the West Bank, Palestine, and the capital of the Jericho Governorate. Jericho is located in the Jordan Valley, with the Jordan River to the east and Jerusalem to the west. It had a population of 20,907 in 2017. From the end of the era of Mandatory Palestine, the city was Jordanian annexation of the West Bank, annexed and ruled by Jordan from 1949 to 1967 and, with the rest of the West Bank, has been subject to Israeli occupation of the West Bank, Israeli occupation since 1967; administrative control was handed over to the Palestinian Authority in 1994. Jericho is among the List of oldest continuously inhabited cities, oldest cities in the world,Murphy-O'Connor, 1998, p. 288.Freedman et al., 2000, p. 689–671. and it is also the city with the oldest known defensive wall.Michal Strutin, ''Discovering Natural Israel'' (2001), p. 4. Archaeology, Archaeologists have unearthed the remains of more than 20 successive settlements in Jericho, the first of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clays develop plasticity (physics), plasticity when wet but can be hardened through Pottery#Firing, firing. Clay is the longest-known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been radiocarbon dating, dated to around 14,000 BCE, and Clay tablet, clay tablets were the first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtration, filtering. Between one-half and two-thirds of the world's population live or work in buildings made with clay, often baked into brick, as an essenti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
