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Screed
Screed has three meanings in building construction: # A flat board (screed board, floating screed) or a purpose-made aluminium tool used to smooth and to "true" materials like concrete, stucco and plaster after they have been placed on a surface or to assist in flattening; # A strip of plaster or wood applied to a surface to act as a guide for a screed tool (screed rail, screed strip, screed batten); # The material itself which has been flattened with a screed (screed coat). In the UK, ''screed'' has also come to describe a thin, top layer of material (sand and cement, magnesite or calcium sulphate), poured in situ on top of the structural concrete or insulation, on top of which other finishing materials can be applied, or the structural material can be left bare to achieve a raw effect. Screed board In the United States, screeding is the process a person called a concrete finisher performs by cutting off excess wet concrete to bring the top surface of a slab to the proper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Free Floating Screed
The free floating screed is a device pioneered in the 1930s that revolutionized the asphalt paving process. The device is designed to flatten the material (e.g. concrete or asphalt) below it, which is also known as screed. Description The free floating screed has a number of forces acting on it that, when in equilibrium, allow the depth behind the screed to be constant. * Tow arm pull: the force exerted on the screed by the paver dragging it * Mass: the weight of the screed * Resistance of the head of material: the opposing force exerted on the screed by the pile of material in front of the screed. This force depends in turn on the material's viscosity and mass. The angle at which the tow arm pull is exerted on the screed also contributes to the motion; its resultant force is either added or subtracted from the mass of the screed. If each of these forces is constant, altering the angle of the screed to the horizontal (angle of attack) will control the amount of material extr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasterwork
Plasterwork is construction or ornamentation done with plaster, such as a layer of plaster on an interior or exterior wall structure, or plaster Molding (decorative), decorative moldings on ceilings or walls. This is also sometimes called pargeting. The process of creating plasterwork, called plastering or rendering, has been used in building construction for centuries. For the art history of three-dimensional plaster, see stucco. History The earliest plasters known to us were lime-based. Around 7500 BC, the people of 'Ain Ghazal in Jordan used lime mixed with unheated crushed limestone to make plaster which was used on a large scale for covering walls, floors, and hearths in their houses. Often, walls and floors were decorated with red, finger-painted patterns and designs. In ancient India and China, renders in clay and gypsum plasters were used to produce a smooth surface over rough stone or mud brick walls, while in early Egyptian tombs, walls were coated with lime and gyps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Concrete Screed
Power concrete screeds can be used in place of a man powered screed bar to strike off excess concrete. Concrete is poured from a wet mix of cement, sand, aggregate and water Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a .... Prior to the mix drying, the concrete should be smoothed out on the desired surface. A power screed assists in the smoothing out process by leveling out and/or vibrating the wet mixture. There are friction screeds or "roller" screeds that level the concrete which can be powered by gas, electricity or hydraulics. The compaction performance of the power concrete screed is mainly determined by the centrifugal force of the vibration force and only to a minor extent by the static weight. Concrete {{tool-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasterer
A plasterer is a tradesman or tradesperson who works with plaster, such as forming a layer of plaster on an interior wall or plaster decorative moldings on ceilings or walls. The process of creating plasterwork, called plastering, has been used in building construction for centuries. A plasterer is someone who does a full 4 or 2 years apprenticeship to be fully qualified History Plasterwork is one of the most ancient of handicrafts employed in connection with building operations, the earliest evidence showing that the dwellings of primitive man were erected in a simple fashion with sticks and plastered with mud. Soon a more lasting and sightly material was found and employed to take the place of mud or slime, and that perfection in the compounding of plastering materials was approached at a very remote period is made evident by the fact that some of the earliest plastering which has remained undisturbed excels in its scientific composition that which we use at the presen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid Ground Floor
A solid ground floor consists of a layer of concrete, which in the case of a domestic building will be the surface layer brought up to ground floor level with hardcore filling under it. The advantage of a solid ground floor is the elimination of dry rot and other problems normally associated with hollow joisted floors. The disadvantage is that the floor is less resilient to walk upon and may be more tiring for the user. Solid ground floors are usually found or situated in a kitchen but will be necessary for other rooms where wood blocks and other similar finishes are required. Finishes applied to solid ground floors in construction Cement screed: The concrete floor may be topped with a 25 mm thick cement and sand screed trowelled to a smooth finish. The usual mix is 1:3 and a colouring agent may be added to the mix to obtain a more attractive finish. The mix should be as dry as possible and the sand should be coarsely graded and clean to avoid shrinkage and cracking which might ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granolithic
Granolithic screed, also known as granolithic pavingEmmitt and Gorse, p. 566. and granolithic concrete,Harris, p. 470. is a type of construction material composed of cement and fine aggregate such as granite or other hard-wearing rock.Ingham, p. 132. It is generally used as flooring, or as paving (such as for sidewalks). It has a similar appearance to concrete, and is used to provide a durable surface where texture and appearance are usually not important (such as outdoor pathways or factory floors). It is commonly laid as a screed. Screeds are a type of flooring laid on top of the structural element (like reinforced concrete) to provide a level surface on which the "wearing flooring" (the flooring which people see and walk on) is laid.Ingham, p. 130. A screed can also be laid bare, as it provides a long-lasting surface. The aggregate mixed with the cement can be of various size, shape, and material, depending on the texture of the surface needed and how long-lasting it must be.Ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batten
A batten is most commonly a strip of solid material, historically wood but can also be of plastic, metal, or fiberglass. Battens are variously used in construction, sailing, and other fields. In the lighting industry, battens refer to linear light fittings. In the steel industry, battens used as furring may also be referred to as "top hats", in reference to the profile of the metal. Roofing ''Roofing battens'' or ''battening'', also called ''roofing lath'', are used to provide the fixing point for roofing materials such as shingles or tiles. The spacing of the battens on the trusses or rafters depend on the type of roofing material and are applied horizontally like purlins. Battens are also used in metal roofing to secure the sheets called a ''batten-seam roof'' and are covered with a ''batten roll joint''. Some roofs may use a grid of battens in both directions, known as a ''counter-batten system'', which improves ventilation. Roofing battens are most commonly made of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concrete Float
A concrete float is a tool used to finish a concrete surface by making it smooth. A float is used after the surface has been made level using a screed. In addition to removing surface imperfections, floating will compact the concrete as preparation for further steps. A float can be a small hand tool, a larger bull float with a long handle, or a power trowel Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may a ... (also called a power float) with an engine. Concrete floats are generally made of magnesium, aluminum, or wood. External linksBull floats and darbies.Concrete Network. Tools Concrete {{Concrete navbox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concrete Finisher
A concrete finisher is a skilled tradesperson who works with concrete by placing, finishing, protecting and repairing concrete in engineering and construction projects. Concrete finishers are often responsible for setting the concrete forms, ensuring they have the correct depth and pitch. Concrete finishers place the concrete either directly from the concrete wagon chute, concrete pump, concrete skip or wheelbarrow. They spread the concrete using shovels and rakes, sometimes using a straightedge back and forth across the top of the forms to screed or level the freshly placed concrete. After levelling the concrete, they smooth the surface using either a hand trowel, a long handed ''bull float o''r by using powered floats. After the concrete has been leveled and floated, concrete finishers press an ''edger'' between the forms and the concrete to chamfer the edges so that they are less likely to chip. Broom and stamp finishes are a couple of different finished products for outdoor c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floors
A floor is the bottom surface of a room or vehicle. Floors vary from simple dirt in a cave to many layered surfaces made with modern technology. Floors may be stone, wood, bamboo, metal or any other material that can support the expected load. The levels of a building are often referred to as floors, although a more proper term is storey. Floors typically consist of a subfloor for support and a floor covering used to give a good walking surface. In modern buildings the subfloor often has electrical wiring, plumbing, and other services built in. As floors must meet many needs, some essential to safety, floors are built to strict building codes in some regions. Special floor structures Where a special floor structure like a floating floor is laid upon another floor, both may be called subfloors. Special floor structures are used for a number of purposes: * Balcony, a platform projecting from a wall * Floating floor, normally for noise or vibration reduction * Glass floo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnesite
Magnesite is a mineral with the chemical formula (magnesium carbonate). Iron, manganese, cobalt, and nickel may occur as admixtures, but only in small amounts. Occurrence Magnesite occurs as veins in and an alteration product of ultramafic rocks, serpentinite and other magnesium rich rock types in both contact and regional metamorphic terrains. These magnesites are often cryptocrystalline and contain silica in the form of opal or chert. Magnesite is also present within the regolith above ultramafic rocks as a secondary carbonate within soil and subsoil, where it is deposited as a consequence of dissolution of magnesium-bearing minerals by carbon dioxide in groundwaters. Isotopic structure: clumped isotope The recent advancement in the field of stable isotope geochemistry is the study of isotopic structure of minerals and molecules. This requires study of molecules with high resolutions looking at bonding scenario (how heavy isotopes are bonded to each other)- leading to kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stucco
Stucco or render is a construction material made of aggregates, a binder, and water. Stucco is applied wet and hardens to a very dense solid. It is used as a decorative coating for walls and ceilings, exterior walls, and as a sculptural and artistic material in architecture. Stucco can be applied on construction materials such as metal, expanded metal lath, concrete, cinder block, or clay brick and adobe for decorative and structural purposes. In English, "stucco" sometimes refers to a coating for the outside of a building and "plaster" to a coating for interiors; as described below, however, the materials themselves often have little to no differences. Other European languages, notably Italian, do not have the same distinction; ''stucco'' means ''plaster'' in Italian and serves for both. Composition The basic composition of stucco is cement, water, and sand. The difference in nomenclature between stucco, plaster, and mortar is based more on use than composition. Until ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
