1.
Construction aggregate
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Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete, aggregates are also used as base material under foundations, roads, and railroads. Preferred bitumenous aggregate sizes for road construction are given in EN13043 as d/D, the same classification sizing is used for larger armour stone sizes in EN13383, EN12620 for concrete aggregate, EN13242 for base layers of road construction and EN13450 for railway ballast. These products include specific types of coarse and fine aggregate designed for such uses as additives to asphalt and concrete mixes, state transportation departments further refine aggregate material specifications in order to tailor aggregate use to the needs and available supply in their particular locations. In addition, there are materials that are used as specialty lightweight aggregates, clay, pumice, perlite. People have used sand and stone for foundations for thousands of years, significant refinement of the production and use of aggregate occurred during the Roman Empire, which used aggregate to build its vast network of roads and aqueducts. The invention of concrete, which was essential to architecture utilizing arches, created an immediate, vitruvius writes in De architectura, Economy denotes the proper management of materials and of site, as well as a thrifty balancing of cost and common sense in the construction of works. This will be observed if, in the first place, the architect does not demand things which cannot be found or made ready without great expense, for example, it is not everywhere that there is plenty of pit-sand, rubble, fir, clear fir, and marble. Where there is no pit sand, we must use the kinds washed up by rivers or by the sea. the advent of modern blasting methods enabled the development of quarries, which are now used throughout the world, wherever competent bedrock deposits of aggregate quality exist. In many places, good limestone, granite, marble or other quality stone bedrock deposits do not exist, in these areas, natural sand and gravel are mined for use as aggregate. Where neither stone, nor sand and gravel, are available, construction demand is satisfied by shipping in aggregate by rail. Additionally, demand for aggregates can be satisfied through the use of slag. However, the available tonnages and lesser quality of these materials prevent them from being a replacement for mined aggregates on a large scale. Large stone quarry and sand and gravel operations exist near virtually all population centers, limestone and granite are also produced in large amounts as dimension stone. The great majority of crushed stone is moved by truck from the quarry/plant to the first point of sale or use. According to the USGS,2006 U. S. sand and gravel production was 1.32 billion tonnes valued at $8.54 billion, the great majority of this was again moved by truck, instead of by electric train. Currently, total U. S. aggregate demand by final market sector was 30%–35% for non-residential building, 25% for highways, the largest-volume of recycled material used as construction aggregate is blast furnace and steel furnace slag. Blast furnace slag is either air-cooled or granulated, if the granulated blast furnace slag accesses free lime during hydration, it develops strong hydraulic cementitious properties and can partly substitute for portland cement in concrete
2.
Landscape design
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Landscape design is an independent profession and a design and art tradition, practised by landscape designers, combining nature and culture. In contemporary practice, landscape design bridges the space between landscape architecture and garden design, Landscape design focuses on both the integrated master landscape planning of a property and the specific garden design of landscape elements and plants within it. The practical, aesthetic, horticultural, and environmental sustainability are also components of landscape design and it is often divided into hardscape design and softscape design. Landscape designers often collaborate with related disciplines such as architecture and geography, soils and civil engineering, surveying, landscape contracting, botany, design projects may involve two different professional roles, landscape design and landscape architecture. There can be significant overlap of talent and skill between the two roles, depending on the education, licensing, and experience of the professional, both landscape designers and landscape architects practice landscape design. There are innumerable other design factors and considerations brought to the process of designing a garden that is beautiful, well-functioning. The professional section of garden designers in Europe and the Americas went by the name Landscape Gardener, in the 1890s, the distinct classification of landscape architect was created, with educational and licensing test requirements for using the title legally. Beatrix Farrand, the woman in the founding group, refused the title preferring Landscape Gardener. Matching the client and technical needs of a project, and the practitioner with talent, legal qualifications. Institutional education in landscape design appeared in the early 20th century, over time it became available at various levels. Departments of landscape architecture are located within university schools of architecture or environmental design, specialties and minors are available in horticultural botany, horticulture, natural resources, landscape engineering, construction management, fine and applied arts, and landscape design history. Traditionally, hand drawn drawings documented the design and position of features for construction, many landscape designers have an interest and involvement with gardening, personally or professionally. Some integrate this scope with their practice, informally or as licensed landscape contractors. Gardens are dynamic and not static after construction and planting are completed, involvement with landscape management and direction of ongoing garden direction, evolution, and care depend on the professionals and clients needs and inclinations. As with the other interrelated landscape disciplines, there can be overlap of services offered under the titles of landscape designer or professional gardener, garden design Landscape architecture Landscape assessment Landscape design history Landscape planning Space in landscape design Concrete landscape curbing
3.
Crusher
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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. The earliest crushers were hand-held stones, where the weight of the stone provided a boost to muscle power, querns and mortars are types of these crushing devices. In industry, crushers are machines which use a surface to break or compress materials into small fractional chunks or denser masses. Abraham Darby a century later relocated to Bristol where he had established a building brass and bronze industry by importing Dutch workers, both materials were considered superior to iron for cannon, and machines as they were better understood. But Darby would change the world in key ways. Where the Dutch had failed in casting iron, one of Darbys apprentices, John Thomas succeeded in 1707, concurrently, mines needed drained resulting in Savery and Newcomens early steam driven pumping systems. The deeper the mines went, the larger the demand became for better pumps, the greater the demand for iron, the greater the need for coal, the greater the demand for each. Seeing ahead clearly, Darby, sold off his brass business interests and relocated to Coalbrookdale with its coal mines, water power. Over that decade his foundries developed iron casting technologies and began to supplant other metals in many applications and he adapted Coking of his fuel by copying Brewers practices. Economies of scale gradually infused industrial enterprises, while became a key bottleneck as the volume of moved materials continued to increase following demand. This spurred numerous projects, inspired laying first wooden, then iron protected rails using draft animals to pull loads in the emerging bulk goods transportation dependent economy. Like mine pumps, the internal conveyors and trip-hammers contained within these 7—11 story buildings, each crusher is designed to work with a certain maximum size of raw material, and often delivers its output to a screening machine which sorts and directs the product for further processing. Typically, crushing stages are followed by milling stages if the materials need to be further reduced, additionally rockbreakers are typically located next to a crusher to reduce oversize material too large for a crusher. Crushers are used to reduce particle size enough so that the material can be processed into finer particles in a grinder, a typical processing line at a mine might consist of a crusher followed by a SAG mill followed by a ball mill. In this context, the SAG mill and ball mill are considered rather than crushers. In operation, the raw material is delivered to the primary crushers hopper by dump trucks. Primary crushing reduces the large pieces to a size which can be handled by the downstream machinery, some crushers are mobile and can crush rocks as large as 60 inches. Primarily used in-pit at the mine face these units are able to move with the large infeed machines to increase the tonnage produced, in a mobile road operation, these crushed rocks are directly combined with concrete and asphalt which are then deposited on to a road surface
4.
Gravel
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Gravel /ˈɡrævəl/ is composed of unconsolidated rock fragments that have a general particle size range and include size classes from granule- to boulder-sized fragments. Gravel is categorized by the Udden-Wentworth scale into granular gravel and pebble gravel, one cubic metre of gravel typically weighs about 1,800 kg. Gravel is an important commercial product, with a number of applications, many roadways are surfaced with gravel, especially in rural areas where there is little traffic. Globally, far more roads are surfaced with gravel than with concrete or tarmac, both sand and small gravel are also important for the manufacture of concrete. Large gravel deposits are a geological feature, being formed as a result of the weathering. The action of rivers and waves tends to pile up gravel in large accumulations and this can sometimes result in gravel becoming compacted and concreted into the sedimentary rock called conglomerate. Where natural gravel deposits are insufficient for human purposes, gravel is often produced by quarrying and crushing hard-wearing rocks, such as sandstone, limestone, quarries where gravel is extracted are known as gravel pits. Southern England possesses particularly large concentrations of them due to the deposition of gravel in the region during the Ice Ages. As of 2006, the United States is the leading producer and consumer of gravel. The word gravel comes from the Breton language, adding the -el suffix in Breton denotes the component parts of something larger. Thus gravel means the stones which make up such a beach on the coast. Many dictionaries ignore the Breton language, citing Old French gravele or gravelle, Gravel often has the meaning a mixture of different size pieces of stone mixed with sand and possibly some clay. American English also allows small stones without sand mixed in also known as crushed stone, types of gravel include, Bank gravel, naturally deposited gravel intermixed with sand or clay found in and next to rivers and streams. Also known as Bank run or River run, bench gravel, a bed of gravel located on the side of a valley above the present stream bottom, indicating the former location of the stream bed when it was at a higher level. Creek rock, this is rounded, semi-polished stones, potentially of a wide range of types. It is also used as concrete aggregate and less often as a paving surface. Crushed stone, rock crushed and graded by screens and then mixed to a blend of stones and fines and it is widely used as a surfacing for roads and driveways, sometimes with tar applied over it. Crushed stone may be made from granite, limestone, dolomite, also known as crusher run, DGA QP, and shoulder stone
5.
Riprap
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It is made from a variety of rock types, commonly granite or limestone, and occasionally concrete rubble from building and paving demolition. It can be used on any waterway or water containment where there is potential for water erosion, underwater, rock armour caps submerged tunnels to protect against accidental anchor strikes or sinking debris. Ciria-CUR - Rock Manual - The use of rock in hydraulic engineering, allsop - Breakwaters, coastal structures and coastlines
6.
Track ballast
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Track ballast forms the trackbed upon which railroad ties are laid. It is packed between, below, and around the ties and it is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure. This also serves to hold the track in place as the roll by. It is typically made of crushed stone, although ballast has sometimes consisted of other, less suitable materials, the term ballast comes from a nautical term for the stones used to stabilize a ship. The appropriate thickness of a layer of track ballast depends on the size and spacing of the ties, the amount of traffic on the line, and various other factors. Track ballast should never be laid down less than 150 mm thick, an insufficient depth of ballast causes overloading of the underlying soil, and in unfavourable conditions overloading the soil causes the track to sink, usually unevenly. Ballast less than 300 mm thick can lead to vibrations that damage nearby structures, however, increasing the depth beyond 300 mm adds no extra benefit in reducing vibration. In turn, track ballast typically rests on a layer of crushed stones. The sub-ballast layer gives a solid support for the top ballast, sometimes an elastic mat is placed on the layer of sub-ballast and beneath the ballast, thereby significantly reducing vibration. The ballast shoulder always should be at least 150 mm wide, the shape of the ballast is also important. Stones must be cut, with sharp edges, so that they properly interlock and grip the ties in order to fully secure them against movement. In order to let the stones fully settle and interlock, speed limits are often lowered on sections of track for a period of time after new ballast has been laid. If ballast is badly fouled, the clogging will reduce its ability to drain properly, therefore, keeping the ballast clean is essential. Bioremediation can be used to clean ballast and it is not always necessary to replace the ballast if it is fouled, nor must all the ballast be removed if it is to be cleaned. Removing and cleaning the ballast from the shoulder is often sufficient, such machines can clean up to two kilometres of ballast in an hour. In such cases, it is necessary to replace the ballast altogether, the dump and jack method cannot of course be used through tunnels, under overbridges, and where there are platforms. Where the track is laid over a swamp, such as the Hexham swamp in Australia, the ballast continuously sinks, after 150 years of topping up, there appears to be 10 m of sunken ballast under the tracks. Chat Moss in the United Kingdom is similar, regular inspection of the ballast shoulder is important, as noted earlier, the lateral stability of the track depends upon the shoulder
7.
Asphalt concrete
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Asphalt concrete is a composite material commonly used to surface roads, parking lots, airports, as well as the core of embankment dams. It consists of mineral aggregate bound together with asphalt, laid in layers, the process was refined and enhanced by Belgian inventor and U. S. immigrant Edward de Smedt. The abbreviation AC is sometimes used for asphalt concrete but can also denote asphalt content or asphalt cement, mixing is generally performed with the aggregate at about 300 °F for virgin asphalt and 330 °F for polymer modified asphalt, and the asphalt cement at 200 °F. Paving and compaction must be performed while the asphalt is sufficiently hot, in many countries paving is restricted to summer months because in winter the compacted base will cool the asphalt too much before it is able to be packed to the required density. HMAC is the form of asphalt concrete most commonly used on high traffic pavements such as those on major highways, racetracks and it is also used as an environmental liner for landfills, reservoirs, and fish hatchery ponds. Superpave, short for superior performing asphalt pavement, is a pavement system designed to provide longer lasting roadways, key components of the system are careful selection of binders and aggregates, volumetric proportioning of ingredients, and evaluation of the finished product. Warm mix asphalt concrete is produced by adding either zeolites, waxes, asphalt emulsions and this allows significantly lower mixing and laying temperatures and results in lower consumption of fossil fuels, thus releasing less carbon dioxide, aerosols and vapors. The usage of additives in hot mixed asphalt may afford easier compaction. Use of warm mix is rapidly expanding, a survey of US asphalt producers found that nearly 25% of asphalt produced in 2012 was warm mix, a 416% increase since 2009. Cold mix asphalt concrete is produced by emulsifying the asphalt in water with soap prior to mixing with the aggregate, while in its emulsified state the asphalt is less viscous and the mixture is easy to work and compact. The emulsion will break after enough water evaporates and the mix will, ideally. Cold mix is used as a patching material and on lesser trafficked service roads. Cut-back asphalt concrete is a form of cold mix asphalt produced by dissolving the binder in kerosene or another lighter fraction of petroleum prior to mixing with the aggregate, while in its dissolved state the asphalt is less viscous and the mix is easy to work and compact. After the mix is laid down the lighter fraction evaporates, because of concerns with pollution from the volatile organic compounds in the lighter fraction, cut-back asphalt has been largely replaced by asphalt emulsion. Mastic asphalt concrete or sheet asphalt is produced by heating hard grade blown bitumen in a green cooker until it has become a liquid after which the aggregate mix is then added. Mastic asphalt concrete is laid to a thickness of around 3⁄4–1 3⁄16 inches for footpath and road applications. HMAC layers are used both in reinforcement operations and in the construction of new reinforcements for medium and heavy traffic, in base layers, they tend to exhibit a greater capacity of absorbing tensions and, in general, better fatigue resistance. In addition to the asphalt and aggregate, additives, such as polymers, Asphalt concrete pavements—especially those at airfields—are sometimes called tarmac for historical reasons, although they do not contain tar and are not constructed using the macadam process
8.
Limestone
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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate, about 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, most cave systems are through limestone bedrock. The first geologist to distinguish limestone from dolomite was Belsazar Hacquet in 1778, like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of organisms such as coral or foraminifera. Other carbonate grains comprising limestones are ooids, peloids, intraclasts and these organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragment, some limestones do not consist of grains at all, and are formed completely by the chemical precipitation of calcite or aragonite, i. e. travertine. Secondary calcite may be deposited by supersaturated meteoric waters and this produces speleothems, such as stalagmites and stalactites. Another form taken by calcite is oolitic limestone, which can be recognized by its granular appearance, the primary source of the calcite in limestone is most commonly marine organisms. Some of these organisms can construct mounds of rock known as reefs, below about 3,000 meters, water pressure and temperature conditions cause the dissolution of calcite to increase nonlinearly, so limestone typically does not form in deeper waters. Limestones may also form in lacustrine and evaporite depositional environments, calcite can be dissolved or precipitated by groundwater, depending on several factors, including the water temperature, pH, and dissolved ion concentrations. Calcite exhibits a characteristic called retrograde solubility, in which it becomes less soluble in water as the temperature increases. Impurities will cause limestones to exhibit different colors, especially with weathered surfaces, Limestone may be crystalline, clastic, granular, or massive, depending on the method of formation. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock, when conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Travertine is a banded, compact variety of limestone formed along streams, particularly there are waterfalls. Calcium carbonate is deposited where evaporation of the leaves a solution supersaturated with the chemical constituents of calcite. Tufa, a porous or cellular variety of travertine, is found near waterfalls, coquina is a poorly consolidated limestone composed of pieces of coral or shells. During regional metamorphism that occurs during the building process, limestone recrystallizes into marble
9.
Quarry
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A quarry is a place from which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate has been excavated from the ground. A quarry is the thing as an open-pit mine from which minerals are extracted. The only non-trivial difference between the two is that open-pit mines that produce building materials and dimension stone are commonly referred to as quarries, the word quarry can also include the underground quarrying for stone, such as Bath stone. The surfaces are polished and finished with varying degrees of sheen or luster, polished slabs are often cut into tiles or countertops and installed in many kinds of residential and commercial properties. Natural stone quarried from the earth is considered a luxury and tends to be a highly durable surface. Quarries in level areas with shallow groundwater or which are located close to surface water often have engineering problems with drainage, generally the water is removed by pumping while the quarry is operational, but for high inflows more complex approaches may be required. For example, the Coquina quarry is excavated to more than 60 feet below sea level, to reduce surface leakage, a moat lined with clay was constructed around the entire quarry. Ground water entering the pit is pumped up into the moat, as a quarry becomes deeper, water inflows generally increase and it also becomes more expensive to lift the water higher during removal, this can become the limiting factor in quarry depth. Some water-filled quarries are worked from beneath the water, by dredging, many people and municipalities consider quarries to be eyesores and require various abatement methods to address problems with noise, dust, and appearance. One of the effective and famous examples of successful quarry restoration is Butchart Gardens in Victoria, BC. A further problem is pollution of roads from trucks leaving the quarries, to control and restrain the pollution of public roads, wheel washing systems are becoming more common. Many quarries naturally fill with water after abandonment and become lakes, water-filled quarries can be very deep with water, often 50 feet or more, that is often surprisingly cold. Unexpectedly cold water can cause a swimmers muscles to weaken, it can also cause shock. Though quarry water is very clear, submerged quarry stones. Several people drown in quarries each year, however, many inactive quarries are converted into safe swimming sites
10.
Bellefonte, Pennsylvania
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Bellefonte is a borough and the county seat of Centre County in the U. S. state of Pennsylvania. It lies about twelve miles northeast of State College and is part of the State College, the borough population was 6,187 at the 2010 Census. It houses the courthouse located downtown on the square, Bellefonte has also been home to five of Pennsylvanias governors as well as two other governors. All seven are commemorated in a monument overlooking Talleyrand Park, however, the spring, which serves as the towns water supply, has been covered to comply with DEP water purity laws. The early development of Bellefonte had been as a natural town and it started with one house and a crossroad, then iron was found and the town grew. William Lamb sold his mill to John Dunlop and the next year James Dunlop, Johns father, as the years went by, Bellefonte boomed and soon became the most influential town between Pittsburgh and Harrisburg. Bellefonte was a frequent stop in the airmail route. The route ran from New York to San Francisco and opened August 20,1920, currently Bellefonte is home to the Red Raiders, the Bellefonte School Districts mascot. The school colors are red and white, the Bellefonte Historic District was added to the National Register of Historic Places in 1977. The Bellefonte Academy was listed until 2008, after having been destroyed by fire in 2004, the Bush House Hotel was financed by Daniel G. Bush and built in 1868. It was one of the first hotels in the country to have electric lights, a man would stand at the train station and call out to the passengers, Walk ya to the Bush House. The Bush House, the Brockerhoff House, the Haag House, thomas Edison stayed at the Bush House. In the recent years, the Bush House had several businesses in it including Schnitzels Restaurant, the Bush House burned down on February 8,2006. Another fire heavily damaged one of the other landmark buildings less than four years later. The Cadillac Building, so named because it was built as a Cadillac dealership in 1916, was a mix use commercial and residential property hit by a devastating fire on December 22,2009. Christmas tree lights in one of the apartment units were determined to be the cause, Cadillac Building is being rebuilt to hold 11 housing units, an office building to maintain properties, and a floor of community space with a completion of Fall 2016. It will remain a part of the Bellefonte Historic District, the popular song After the Ball was said to have been first sung in public here. It was eventually used as a movie theater, first showing silent films
11.
Natural resource
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Natural resources are resources that exist without actions of humankind. This includes all valued characteristics such as magnetic, gravitational, on earth it includes, sunlight, atmosphere, water, land along with all vegetation and animal life that naturally subsists upon or within the heretofore identified characteristics and substances. Particular areas such as the rainforest in Fatu-Hiva are often characterized by the biodiversity and geodiversity existent in their ecosystems, Natural resources may be further classified in different ways. Natural resources are materials and components that can be found within the environment, every man-made product is composed of natural resources. Some natural resources such as sunlight and air can be found everywhere, however, most resources only occur in small sporadic areas, and are referred to as localised resources. There are very few resources that are considered inexhaustible – these are solar radiation, geothermal energy, the vast majority of resources are theoretically exhaustible, which means they have a finite quantity and can be depleted if managed improperly. There are various methods of categorizing natural resources, these include source of origin, stage of development, fossil fuels such as coal and petroleum are also included in this category because they are formed from decayed organic matter. Abiotic – Abiotic resources are those that come from non-living, non-organic material, examples of abiotic resources include land, fresh water, air and heavy metals including ores such as gold, iron, copper, silver, etc. For example, petroleum occurs with sedimentary rocks in various regions, Actual resources — Actual resources are those that have been surveyed, their quantity and quality determined and are being used in present times. The development of a resource, such as wood processing depends upon the technology available. Reserve resources — The part of a resource which can be developed profitably in the future is called a reserve resource. Stock resources — Stock resources are those that have been surveyed, renewability is a very popular topic and many natural resources can be categorized as either renewable or non-renewable, Renewable resources — Renewable resources can be replenished naturally. Some of these resources, like sunlight, air, wind, water, etc. are continuously available, though many renewable resources do not have such a rapid recovery rate, these resources are susceptible to depletion by over-use. Non-renewable resources – Non-renewable resources either form slowly or do not naturally form in the environment, minerals are the most common resource included in this category. Some resources actually naturally deplete in amount without human interference, the most notable of these being radio-active elements such as uranium, of these, the metallic minerals can be re-used by recycling them, but coal and petroleum cannot be recycled. Once they are used they take millions of years to replenish. Resource extraction involves any activity that withdraws resources from nature and this can range in scale from the traditional use of preindustrial societies, to global industry. Extractive industries are, along with agriculture, the basis of the sector of the economy
