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Natural Cement
Rosendale cement is a natural hydraulic cement that was produced in and around Rosendale, New York, beginning in 1825. From 1818 to 1970 natural cements were produced in over 70 locations in the United States and Canada. More than half of the 35 million tons of natural cement produced in the United States originated with cement rock mined in Ulster County, New York, in and around the Town of Rosendale in the Hudson River Valley. The Rosendale region of southeastern New York State is widely recognized as the source of the highest quality natural cement in North America. The Rosendale region was also coveted by geologists, such as W. W. Mather, a geologist working for the State of New York, for its unusual exposed bedrock.` Because of its reputation, Rosendale cement was used as both a trade name and as a generic term referring to any natural hydraulic cement in the US. It was used in the construction of many of the United States' most important landmarks, including the Brooklyn Bridg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snyder Estate Natural Cement Historic District
The Snyder Estate Natural Cement Historic District is located in the Town of Rosendale, New York, United States. It is a tract roughly bounded by Rondout Creek, Binnewater and Cottekill roads and Sawdust Avenue. NY 213 runs through the lower portion of the district, paralleling the dry bed of the Delaware and Hudson Canal. Within the district's bounds are 122 contributing properties representing what remains of five plants that produced Rosendale cement, and the homes and dependencies of the Snyder family, who originally owned the land. They range in age from the bed of the canal, where the cement was discovered in 1825 during construction, to some of the last factories built before production was ended in 1970. Included are not just homes, barns, and factories but mines, reservoirs, and a rail siding. After an aborted attempt to secure National Historic Landmark District status in 1978, the district was added to the National Register of Historic Places in 1992. Geography ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cement
A cement is a binder, a chemical substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel ( aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource. Cements used in construction are usually inorganic, often lime or calcium silicate based, which can be characterized as hydraulic or the less common non-hydraulic, depending on the ability of the cement to set in the presence of water (see hydraulic and non-hydraulic lime plaster). Hydraulic cements (e.g., Portland cement) set and become adhesive through a chemical reaction between the dry ingredients and water. The chemical reaction results in mineral hydrates that are not very water-soluble and so are quite durable in wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portland Cement
Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin, and is usually made from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum. Several types of portland cement are available. The most common, called ordinary portland cement (OPC), is grey, but white Portland cement is also available. Its name is derived from its resemblance to Portland stone which was quarried on the Isle of Portland in Dorset, England. It was named by Joseph Aspdin who obtained a patent for it in 1824. His son William Aspdin is regarded as the inventor of "modern" portland cement due to his developments in the 1840s. The low cost and widespread availability of the limestone, shales ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASTM International
ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. Some 12,575 ASTM voluntary consensus standards operate globally. The organization's headquarters is in West Conshohocken, Pennsylvania, about northwest of Philadelphia. It is founded in 1902 as the American Section of the International Association for Testing Materials (see also International Organization for Standardization). History A group of scientists and engineers, led by Charles Dudley, formed ASTM in 1898 to address the frequent rail breaks affecting the fast-growing railroad industry. The group developed a standard for the steel used to fabricate rails. Originally called the "American Society for Testing Materials" in 1902, it became the "American Society for Testing And Materials" in 1961. In 2001, ASTM official ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Bridge (New York City)
The High Bridge (originally the Aqueduct Bridge) is the oldest bridge in New York City, having originally opened as part of the Croton Aqueduct in 1848 and reopened as a pedestrian walkway in 2015 after being closed for over 45 years. A steel arch bridge with a height of over the Harlem River, it connects the New York City boroughs of the Bronx and Manhattan. The eastern end is located in the Highbridge section of the Bronx near the western end of West 170th Street, and the western end is located in Highbridge Park in Manhattan, roughly parallel to the end of West 174th Street. High Bridge was originally completed in 1848 with 16 individual stone arches. In 1928, the five that spanned the Harlem River were replaced by a single steel arch. The bridge was closed to all traffic from around 1970 until its restoration, which began in 2009. The bridge was reopened to pedestrians and bicycles on June 9, 2015. The bridge is operated and maintained by the New York City Department o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Jefferson (Florida)
Fort Jefferson is a massive but unfinished coastal fortress. It is the largest brick masonry structure in the Americas, and is composed of over 16 million bricks. The building covers . Among United States forts, only Fort Monroe in Virginia and Fort Adams in Rhode Island are larger. The fort is located on Garden Key in the lower Florida Keys within the Dry Tortugas National Park, west of the island of Key West. The Dry Tortugas are part of Monroe County, Florida, United States. History Construction In late December 1824 and early January 1825, about five years after Spain sold Florida to the United States for $5 million, U.S. Navy Commodore David Porter inspected the Dry Tortugas islands. He was on the lookout for a site for a naval station that would help suppress piracy in the Caribbean. Unimpressed with what he saw, he notified the United States Secretary of the Navy, Secretary of the Navy that the Dry Tortugas were unfit for any kind of naval establishment. He re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Lawrence Seaway
The St. Lawrence Seaway (french: la Voie Maritime du Saint-Laurent) is a system of locks, canals, and channels in Canada and the United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America, as far inland as Duluth, Minnesota, at the western end of Lake Superior. The seaway is named for the St. Lawrence River, which flows from Lake Ontario to the Atlantic Ocean. Legally, the seaway extends from Montreal, Quebec, to Lake Erie, and includes the Welland Canal. Ships from the Atlantic Ocean are able to reach ports in all five of the Great Lakes. The St. Lawrence River portion of the seaway is not a continuous canal; rather, it consists of several stretches of navigable channels within the river, a number of locks, and canals along the banks of the St. Lawrence River to bypass several rapids and dams. A number of the locks are managed by the St. Lawrence Seaway Management Corporation in Canada, and others in the United States b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York State Thruway
{{Infobox road , state = NY , type = NYST , alternate_name = Governor Thomas E. Dewey Thruway , maint = NYSTA , map = {{maplink, frame=yes, plain=yes, frame-align=center, frame-width=290, type=line, stroke-width=2, type2=line, from2=New York State Thruway Spur Routes.map , map_custom = yes , map_notes = Map of New York with the Thruway mainline in red; other components of the Thruway system are in blue , length_mi = 496.00 , length_ref = , length_notes = Mainline only , established = {{Start date, June 24, 1954 , restrictions = No explosives (including in cargo) between exits 9 and 11 No commercial vehicles allowed on the Garden State Parkway Connector , allocation = {{plainlist, 1= * {{jct, state=NY, I-Toll, 87 between The Bronx and Albany * {{jct, state=NY, I-Toll, 287 between Elmsford and Suffern * {{jct, state=NY, I-Toll, 90 between Albany and Ripley and the Berkshire Connector * {{jct, state=NY, I-Toll, 95 on the New England Thruway , direction_a = South ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rockefeller Center
Rockefeller Center is a large complex consisting of 19 commerce, commercial buildings covering between 48th Street (Manhattan), 48th Street and 51st Street (Manhattan), 51st Street in Midtown Manhattan, New York City. The 14 original Art Deco buildings, commissioned by the Rockefeller family, span the area between Fifth Avenue and Sixth Avenue (Manhattan), Sixth Avenue, split by a large sunken square and a private street called Rockefeller Plaza. Later additions include 75 Rockefeller Plaza across 51st Street at the north end of Rockefeller Plaza, and four International Style (architecture), International Style buildings on the west side of Sixth Avenue. In 1928, the site's then-owner, Columbia University, leased the land to John D. Rockefeller Jr., who was the main person behind the complex's construction. Originally envisioned as the site for a new Metropolitan Opera building, the current Rockefeller Center came about after the Met could not afford to move to the proposed new ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Croton Aqueduct
The Croton Aqueduct or Old Croton Aqueduct was a large and complex water distribution system constructed for New York City between 1837 and 1842. The great aqueducts, which were among the first in the United States, carried water by gravity from the Croton River in Westchester County to reservoirs in Manhattan. It was built because local water resources had become polluted and inadequate for the growing population of the city. Although the aqueduct was largely superseded by the New Croton Aqueduct, which was built in 1890, the Old Croton Aqueduct remained in service until 1955. Background The island of Manhattan, surrounded by brackish rivers, had a limited supply of freshwater available. It dwindled as the city grew rapidly after the American Revolutionary War, and freshwater sources became polluted by effluent. Before the aqueduct was constructed, residents of New York obtained water from cisterns, wells, natural springs, and other bodies of water. But rapid population growth i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delaware And Hudson Canal
The Delaware and Hudson Canal was the first venture of the Delaware and Hudson Canal Company, which would later build the Delaware and Hudson Railway. Between 1828 and 1899, the canal's barges carried anthracite coal from the mines of northeastern Pennsylvania to the Hudson River and thence to market in New York City. Construction of the canal involved some major feats of civil engineering, and resulted in the development of some new technologies, particularly in rail transport. Its operation stimulated the city's growth and encouraged settlement in the sparsely populated region. Unlike many other canals of that era, the canal remained a profitable private operation for most of its existence. The canal was declared a National Historic Landmark in 1968. The canal was abandoned during the early 20th century, and much of it was subsequently drained and filled. Some fragments remain in New York and Pennsylvania. History Before the canal During the early 19th century, Philadelphia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
