Cyclopean masonryFrom Wikipedia, the free encyclopediaCyclopean masonryis a type ofstoneworkfound inMycenaeanarchitecture, built with massivelimestoneboulders, roughly fitted together with minimalclearancebetween adjacent stones and no use ofmortar. The boulders typically seem unworked, but some may have been worked roughly with a hammer and the gaps between boulders filled in with smaller chunks of limestone.The most famous examples of Cyclopean masonry are found in the walls ofMycenaeandTiryns, and the style is characteristic ofMycenaeanfortifications. Similar styles of stonework are found in other cultures and the term has come to be used to describe typical stonework of this sort.The term comes from the belief of classical Greeks that only the mythicalCyclopeshad the strength to move the enormous boulders that made up the walls of Mycenae and Tiryns.Pliny'sNatural Historyreported the tradition attributed toAristotle, that the Cyclopes were the inventors of masonry towers, giving rise to the designationCyclopean.[1]

zidrie ciclopiceDe la Wikipedia , enciclopedia liberZidrie ciclopice este un tip de piatr gsite n arhitectur miceniene , construit cu bolovani masive de calcar , aproximativ montate mpreun cu clearance-ul minim ntre pietre adiacente i nici un folos de mortar . Bolovani de obicei, par neprelucrate , dar unele pot fi lucrat aproximativ cu un ciocan i decalajele ntre bolovani umplut cu buci mici de calcar .Cele mai cunoscute exemple de zidrie ciclopice se gsesc n pereii de Micene si Tirint , iar stilul este caracteristic de fortificatii miceniene . Stiluri similare de piatr se gsesc n alte culturi , iar termenul a ajuns s fie folosit pentru a descrie piatra tipic de acest fel .Termenul vine de la convingerea de greci clasice care doar ciclopi mitice avut puterea s se mute bolovani enorme care au fcut pn zidurile Micene si Tirint . Istorie Natural lui Pliniu a raportat tradiia atribuit lui Aristotel , c ciclopii au fost inventatorii de turnuri de zidrie , care a dus la desemnarea ciclopice .

Contents[hide] 1Current definitions of Cyclopean masonry 2Outdated definitions of the Cyclopean style 3Historical accounts 4Locations of Cyclopean structures 5External linksCurrent definitions of Cyclopean masonry[edit]

A typical stretch of Cyclopean walling (nearGrave Circle Aat Mycenae)The walls are usually founded in extremely shallow beddings carved out of the bedrock. 'Cyclopean', the term normally applied to the masonry style characteristic of Mycenaean fortification systems, describes walls built of huge, unworked limestone boulders which are roughly fitted together. Between these boulders, smaller hunks of limestone fill the interstices. The exterior faces of the large boulders may be roughly hammer-dressed, but the boulders themselves are never carefully cut blocks. Very large boulders are typical of the Mycenaean walls atMycenae,Tiryns,Argos,Krisa(inPhocis), and theAthenian Acropolis. Somewhat smaller boulders occur in the walls ofMidea, whereas largelimestoneslabs are characteristic of the walls atGla. Cut stone masonry is used only in and around gateways, conglomerate at Mycenae and Tiryns and perhaps both conglomerate and limestone at Argos.[2]Outdated definitions of the Cyclopean style[edit]Harry Thurston Peck, writing in 1898, divided Cyclopean masonry into four categories or styles:[3]1. The first style, which is the oldest, consists of unwrought stones of various sizes in which the gaps are, or were, filled with small stones.2. The second is characterized by polygonal stones, which fit against each other with precision.3. The third style includes structures inPhocis,BoeotiaandArgolis. It is characterized by work made in courses and by stones of unequal size, but of the same height. This category includes the walls of Mycenae, theLion Gate, and theTreasury of Atreus.[4]4. The fourth style is characterized by horizontal courses of masonry, not always of the same height, but of stones which are all rectangular. This style is common inAttica.While Peck's first and possibly second and third styles conforms to whatarchaeologiststoday would classify as cyclopean, the fourth now is referred to asashlarand is not considered cyclopean. There is a more detailed description of the Cyclopean styles at thePerseus Project.[5]Historical accounts[edit]

Difference between Cyclopean masonry, shown in the blue rectangle, and ashlar masonry, outside the rectangle (theLion Gate,Mycenae, 13th century BC)Pausaniasdescribed the Cyclopean walls ofMycenaeandTiryns:There still remain, however, parts of the city wall [of Mycenae], including the gate, upon which stand lions. These, too, are said to be the work of theCyclopes, who made forProetusthe wall atTiryns.(2.16.5)Going on from here and turning to the right, you come to the ruins of Tiryns. ... The wall, which is the only part of the ruins still remaining, is a work of theCyclopesmade of unwrought stones, each stone being so big that a pair of mules could not move the smallest from its place to the slightest degree. Long ago small stones were so inserted that each of them binds the large blocks firmly together.(2.25.8)Modern archaeologists use "Cyclopean" in a more restricted sense than the description by Pausanias; while Pausanias attributes all of the fortifications of Tiryns and Mycenae, including the Lion Gate, to the Cyclopes, only parts of these walls are built in Cyclopean masonry. The photograph above shows the difference between Cyclopean masonry (shown in the blue rectangle), and theashlarmasonry of the Lion Gate.Locations of Cyclopean structures[edit]Apart from the Tirynthian and Mycenaean walls, other Cyclopean structures include sometholos tombsin Greece and the fortifications of a number ofMycenaeansites, most famously atGla.InSicilythere are many Cyclopean structures especially in the eastern part of the island.In Cyprus, theKition archaeological sitein present dayLarnaca, has revealed cyclopean walls.TheNuragheof Bronze AgeSardiniaalso are described as being constructed in cyclopean masonry, as are some of the constructions of theTalaiotic Cultureabounding onMenorcaand present to a lesser extent onMallorca.References

MasonryFrom Wikipedia, the free encyclopediaThis article refers to the building structure component; for the fraternal organization, seeFreemasonry.This articleneeds additional citations forverification.Please helpimprove this articlebyadding citations to reliable sources. Unsourced material may be challenged and removed.(April 2012)

A mason laying mortar on top of a finished course of blocks, prior to placing the next course.Masonryis the building of structures from individual units laid in and bound together bymortar; the termmasonrycan also refer to the units themselves. The common materials of masonry construction arebrick,stone,marble,granite,travertine,limestone,cast stone,concrete block,glassblock,stucco,tile, andcob. Masonry is generally a highly durable form of construction. However, the materials used, the quality of the mortar and workmanship, and the pattern in which the units are assembled can significantly affect the durability of the overall masonry construction.Contents[hide] 1Applications 1.1Advantages 1.2Disadvantages 1.3Structural limitations 2Veneer masonry 3Dry set masonry 4Brick 4.1Uniformity and rusticity 4.2Serpentine masonry 5Concrete block 6A-jacks 7Gabions 8Bagged concrete 9Masonry training 10Passive fire protection (PFP) 11Mechanical modelling of masonry structures 12See also 13References 14External linksApplications[edit]Masonry is commonly used for the walls of buildings, retaining walls and buildings. Brick and concrete block are the most common types of masonry in use in industrialized nations and may be either weight-bearing or aveneer. Concrete blocks, especially those with hollow cores, offer various possibilities in masonry construction. They generally provide great compressive strength, and are best suited to structures with light transverse loading when the cores remain unfilled. Filling some or all of the cores with concrete or concrete with steel reinforcement (typicallyrebar) offers much greater tensile and lateral strength to structures.Advantages[edit] The use of material such as bricks and stones can increase the thermal mass of a building and can protect the building from fire. Most types of masonry typically will not require painting and so can provide a structure with reduced life-cycle costs. Masonry is non-combustible product. Masonry walls are more resistant to projectiles, such as debris from hurricanes or tornadoes. Masonry structures built in compression preferably with lime mortar can have a useful life of more than 500 years as compared to 30 to 100 for structures of steel or reinforced concrete.[citation needed]Disadvantages[edit] Extreme weather -combined with the right circumstances- can cause degradation of masonry wall surfaces due to frost damage. Masonry tends to be heavy and must be built upon a strong foundation, such as reinforced concrete, to avoid settling and cracking. Save for concrete, masonry construction does not lend itself well to mechanization, and requires more skilled labor than stick-framing.Structural limitations[edit]Masonry boasts an impressive compressive strength (vertical loads) but is much lower in tensile strength (twisting or stretching) unless reinforced. The tensile strength of masonry walls can be strengthened by thickening the wall, or by building masonrypiers(vertical columns or ribs) at intervals. Where practical, steel reinforcements such aswindpostscan be added.Veneer masonry[edit]A masonry veneer wall consists of masonry units, usually clay-based bricks, installed on one or both sides of a structurally independent wall usually constructed of wood or masonry. In this context the brick masonry is primarily decorative, not structural. The brick veneer is generally connected to the structural wall by brick ties (metal strips that are attached to the structural wall, as well as the mortar joints of the brick veneer). There is typically an air gap between the brick veneer and the structural wall. As clay-based brick is usually not completely waterproof, the structural wall will often have a water-resistant surface (usuallytar paper) andweep holescan be left at the base of the brick veneer to drain moisture that accumulates inside the air gap. Concrete blocks, real and cultured stones, and veneeradobeare sometimes used in a very similar veneer fashion.Most insulated buildings that utilize concrete block, brick, adobe, stone, veneers or some combination thereof feature interiorinsulationin the form offiberglassbatts between wooden wall studs or in the form of rigid insulation boards covered withplasterordrywall. In most climates this insulation is much more effective on the exterior of the wall, allowing the building interior to take advantage of the aforementioned thermal mass of the masonry. This technique does, however, require some sort of weather-resistant exterior surface over the insulation and, consequently, is generally more expensive.Dry set masonry[edit]

Dry set masonry supports a rusticlog bridge, where it provides a well-drained support for the log (which will increase its service life).See also:dry stoneThe strength of a masonry wall is not entirely dependent on the bond between the building material and the mortar; thefrictionbetween the interlocking blocks of masonry is often strong enough to provide a great deal of strength on its own. The blocks sometimes have grooves or other surface features added to enhance this interlocking, and somedry setmasonry structures forgo mortar altogether.Brick[edit]Main article:BrickworkSolidbrickworkis made of two or morewythesof bricks with the units running horizontally (calledstretcherbricks) bound together with bricks runningtransverseto the wall (called "header" bricks). Each row of bricks is known as a course. The pattern of headers and stretchers employed gives rise to differentbondssuch as the common bond (with every sixth course composed of headers), the English bond, and theFlemish bond(with alternating stretcher and header bricks present on every course). Bonds can differ in strength and in insulating ability. Vertically staggered bonds tend to be somewhat stronger and less prone to major cracking than a non-staggered bond.Uniformity and rusticity[edit]

Masonry repair work done to a brick wall.The wide selection of brick styles and types generally available in industrialized nations allow much variety in the appearance of the final product. In buildings built during the 1950s-1970s, a high degree of uniformity of brick and accuracy in masonry was typical. In the period since then this style was thought to be too sterile, so attempts were made to emulate older, rougher work. Some brick surfaces are made to look particularly rustic by includingburntbricks, which have a darker color or an irregular shape. Others may use antique salvage bricks, or new bricks may be artificially aged by applying various surface treatments, such as tumbling. The attempts at rusticity of the late 20th century have been carried forward by masons specializing in a free, artistic style, where the courses are intentionallynotstraight, instead weaving to form more organic impressions.Serpentine masonry[edit]Main article:Crinkle crankle wallsA crinkle-crankle wall is a brick wall that follows a serpentine path, rather than a straight line. This type of wall is more resistant to toppling than a straight wall; so much so that it may be made of a single wythe of unreinforced brick and so despite its longer length may be more economical than a straight wall.Concrete block[edit]

Concrete masonry units (CMUs) or blocks in a basement wall before burial.Blocks of cinder concrete (cinder blocksorbreezeblocks), ordinary concrete (concrete blocks), or hollow tile are generically known as Concrete Masonry Units (CMUs). They usually are much larger than ordinary bricks and so are much faster to lay for a wall of a given size. Furthermore, cinder and concrete blocks typically have much lowerwaterabsorption rates than brick. They often are used as the structural core for veneered brick masonry, or are used alone for the walls of factories, garages and otherindustrial-stylebuildings where such appearance is acceptable or desirable. Such blocks often receive astuccosurface for decoration. Surface-bondingcement, which contains synthetic fibers for reinforcement, is sometimes used in this application and can impart extra strength to a block wall. Surface-bonding cement is often pre-coloured and can be stained or painted thus resulting in a finished stucco-like surface.The primary structural advantage of concrete blocks in comparison to smaller clay-based bricks is that a CMU wall can be reinforced by filling the block voids withconcretewith or without steelrebar. Generally, certain voids are designated for filling and reinforcement, particularly at corners, wall-ends, and openings while other voids are left empty. This increases wall strength and stability more economically than filling and reinforcing all voids. Typically, structures made of CMUs will have the top course of blocks in the walls filled with concrete and tied together with steel reinforcement to form a bond beam. Bond beams are often a requirement of modernbuilding codesand controls. Another type of steel reinforcement, referred to asladder-reinforcement, can also be embedded in horizontal mortar joints of concrete block walls. The introduction of steel reinforcement generally results in a CMU wall having much greater lateral and tensile strength than unreinforced walls.CMUs can be manufactured to provide a variety of surface appearances. They can be colored during manufacturing or stained or painted after installation. They can be split as part of the manufacturing process, giving the blocks a rough face replicating the appearance of natural stone, such asbrownstone. CMUs may also be scored, ribbed, sandblasted, polished, striated (raked or brushed), include decorative aggregates, be allowed to slump in a controlled fashion during curing, or include several of these techniques in their manufacture to provide a decorative appearance.[1]"Glazed concrete masonry units are manufactured by bonding a permanent colored facing (typically composed of polyester resins, silica sand and various other chemicals) to a concrete masonry unit, providing a smooth impervious surface."[2]Glass blockor glass brick are blocks made from glass and provide a translucent to clear vision through the block.A-jacks[edit]A-jacks(used in erosion control walls and sea walls) are highly stable, concrete 6-pronged armor units designed to interlock into a flexible, highly permeable matrix. They can be installed either randomly or in a uniform pattern. They look like giant 3-foot versions of the metal jacks that children play with.In the uniform placement pattern, each unit is in contact with the six adjacent units, providing high stability. They are patterned after thebuckyballmodel.[3]StoneworkStone blocks used in masonry can be dressed or rough, though in both examples: corners, door and window jambs, and similar areas are usually dressed. Stone masonry utilizing dressed stones is known asashlarmasonry, whereas masonry using irregularly shaped stones is known asrubble masonry. Both rubble and ashlar masonry can be laid in coursed rows of even height through the careful selection or cutting of stones, but a great deal of stone masonry is uncoursed. Slipform stonemasonryproduces a hybrid wall of reinforced concrete with a rubble stone face. Naturalstone veneersover CMU, cast-in-place, or tilt-up concrete walls are widely used to give the appearance of stone masonry. Sometimes river rock of smooth oval-shaped stones is used as a veneer. This type of material is not favored for solid masonry as it requires a great amount of mortar and can lack intrinsic structural strength. Manufactured-stone, or cultured stone, veneers are popular alternatives to natural stones. Manufactured-stone veneers are typically made from concrete. Natural stones from quarries around the world are sampled and recreated using molds, aggregate, and colorfast pigments. To the casual observer there may be no visual difference between veneers of natural and manufactured stone.Gabions[edit]Gabionsare rectangular wire baskets, usually ofzinc-protectedsteel(galvanized steel) that are filled with fractured stone of medium size. These will act as a single unit and are stacked with setbacks to form a revetment orretaining wall. They have the advantage of being both well drained and flexible, and so resistant to flood, water flow from above, frost damage, and soil flow. Their expected useful life is only as long as the wire they are composed of and if used in severe climates (such as shore-side in a salt water environment) must be made of appropriate corrosion-resistant wire.Bagged concrete[edit]A low grade concrete may be placed in woven plastic sacks similar to that used forsandbagsand then emplaced. The sacks are then watered and the emplacement then becomes a series of artificial stones that conform to one another and to adjacent soil and structures. This conformation makes them resistant to displacement. The sack becomes non-functional and eventually disintegrates. This type of masonry is frequently used to protect the entrances and exits of water conduits where a road passes over a stream or dry wash. It is also used to protect stream banks from erosion, especially where a road passes close by.Masonry training[edit]Stonemasonry happens to be one of thoseprofessionsthat was one of the first in thehistory of construction. It is very much regarded as a traditional skill.Passive fire protection (PFP)[edit]Masonry walls have anendothermiceffect of itshydrates, as in chemically boundwater, as well as unbound moisture from the concrete block, as well as the poured concrete if the hollow cores inside the blocks are filled.Masonry buildings can also be built to increase safety by reducing fire damage, such as the use offire cutsduring construction.Mechanical modelling of masonry structures[edit]

A comparison (using transmission photoelasticity) between the stress diffusion in an elastic body (on the left) and a model of masonry (on the right). A highly localized stress percolation is visible on the right.From the point of view of material modelling, masonry is a special material of extreme mechanical properties (with a very high ratio between strength in compression and in tension), so that the applied loads do not diffuse as they do in elastic bodies, but tend to percolate along lines of high stiffness,[4][5]see the figure on the right and watch avideofor more details.