Arizona Concrete
According to the Mine Faculty at the University of Arizona, cement is
manufactured primarily from suitable limestone and shale rocks. Arizona had two
dry-process cement plants in 1969, namely the Arizona Portland Cement Company
plant in Pima County, near Tucson, and the American Cement Corporation plant at
Clarkdale, in Yavapai County (52-53).
The use of cementing materials goes back to the ancient Egyptians and
Romans, but the invention of modern portland cement is usually attributed to
Joseph Aspdin, a builder in Leeds, England, who obtained a patent for it in 1824.
Currently, the annual world production of portland cement is around 700 million
metric tons (Danbury).
Many people use the words concrete and cement interchangeably, but
they're not. Concrete is to cement as a cake is to flour. Concrete is a mixture
of ingredients that includes cement but contains other ingredients also (Day 6-
7).
Portland cement is produced by pulverizing clinker consisting
essentially of hydraulic calcium silicates along with some calcium aluminates
and calcium aluminoferrites and usually containing one or more forms of calcium
sulfate (gypsum) as an interground addition. Materials used in the manufacture
of portland cement must contain appropriate proportions of calcium oxide, silica,
alumina, and iron oxide components. During manufacture, analyses of all
materials are made frequently to ensure a uniformly high quality cement.
Selected raw materials are crushed, milled, and proportioned in such a
way that the resulting mixture has the desired chemical composition. The raw
materials are generally a mixture of calcareous (calcium oxide) material, such
as limestone, chalk or shells, and an argillaceous (silica and alumina) material
such as clay, shale, or blast-furnace slag. Either a dry or a wet process is
used. In the dry process, grinding and blending operations are done with dry
materials. In the wet process, the grinding and blending are done with the
materials in slurry form. In other respects, the dry and wet processes are very
much alike.
After blending, the ground raw material is fed into the upper end of a
kiln. The raw mix passes through the kiln at a rate controlled by the slope and
rotational speed of the kiln. Burning fuel (powdered coal, oil, or gas) is
forced into the lower end of the kiln where temperatures of 2600°F to 3000°F
change the raw material chemically into cement clinker, grayish-black pellets
about the size of 1/2-in.-diameter marbles.
The clinker is cooled and then pulverized. During this operation a small
amount of gypsum is added to regulate the setting time of the cement. The
clinker is ground so fine that nearly all of it passes through a No.
of sand and gravel deposits that lay on top of London clay and it is
Richard Balko and Mary Maxfield discuss personal responsibility, and choices in one’s health in their essays “What You Eat Is Your Business,” and “Food as Thought: Resisting the Moralization of Eating” respectively. Balko feels the government should not intervene in people’s food intake because it is an individual preference. Instead, Balko asserts that the government should foster a program to assist the American people to take on personal responsibility and ownership of their own health. Similarly, Maxfield paints the same picture that our culture now finds it immoral to eat what our body needs, therefore believing in the idea of eating less is healthier. Maxfield points out the multi-billion dollar campaign of corporations into advertising false hope into consumers by buying into eradication of fatness. Why has food have suddenly become a risky subject at the dinner table? And who is to blame? Is it everyone else or do we blame ourselves?
Edgar Allan Poe’s “The Raven” follows the story of a young man who is sadden by the death of a woman named Leonore. As the reader advance through the poem, the main character is getting more and more emotionally unstable. He is clearly suffering from some kind of mental illness most likely depression. The narrator is in first person, we are living the poem through the eyes of the main character. (He compulsorily constructs self-destructive meaning around a raven’s repetition of the word 'Nevermore ', until he finally despairs of being reunited with his beloved Lenore in another world. Just because of the nightmarish effect, the poem cannot be called an elegy.) Poe use vivid details to describe how the narrator is gradually losing his mind.
Immigration has always been a major part of America. In fact, without immigration the creation of America would not have been possible. The majority of immigrants came to America for religious freedom and economic opportunities. However, for the most part before the 1870’s most immigrants were Protestants from northern and western Europe. These immigrants often migrated to the United States as families and usually lived on farms with family or friends who had already migrated beforehand. A lot of immigrants came to America with a plan or goal in mind. They often had saved up money for the long immigration overseas, were skilled in a certain trade, or had already been educated at a high level. Sadly, this would not last. Immigration became so prominent in America between 1870 and 1900 that the foreign-born population of the United States had almost doubled. A lot of German and Irish Catholics had immigrated in the 1840’s and 1850’s, and more decided to immigrate after the Civil War. A portion of Americans were biased against Catholics. Thankfully, the Irish spoke English and the German Catholics reputation was improved because of their Protestant countrymen’s good reputation. However, their children often lacked any skill or education, but they were able to blend in quite well with the American society. More and more immigrants would migrate to the United States without any skill or education and on top of that they were usually poor. These immigrants were called “new” immigrants and they came from all over the world including Italy, Greece, Poland, Hungary, and Russia. However, you cannot blame immigrants for migrating to America. Many immigrants faced religious persecution in their home countries which pushed them away, otherwi...
partner Charles Bage. It took over a year to build and was a first in
The characters in The Lion King closely parallel Hamlet. Simba, the main character in The Lion King, embodies Hamlet, He is the son of the King and rightful heir to the throne. The King of the Pridelands, Mufasa, parallels Hamlet Senior, who is killed by the uncle figure. In The Lion King, the uncle is Scar, and in Hamlet, the uncle figure is Claudius. Laertes, the henchman and right-hand man of Claudius, becomes, in the movie, the Hyenas, Bansai, Shenzi, and Ed. The Hyenas collectively act as hero-worshippers to Scar, loyal subjects, and fellow doers-in-evil. They support Scar completely, just as Laertes supports Claudius. Rosencrantz and Guildenstern are the comic reliefs of Hamlet, and in The Lion King, this role is fulfilled by Timon and Pumbaa, who are a meercat and warthog, respectively. Both sets compliment each other, complete each other's sentences, act as caretakers to Hamlet/Simba, and are comical to the point of being farcical. The role of Horatio, Hamlet's right-hand man, is fulfilled in The Lion King by Nala. Nala concentrates on the aspect that Simba is the rightful King and that it is his responsibility to ascend to the throne. She is his best friend and someone whom he trusts. Just as Horatio loyally follows Hamlet, Nala is completely loyal to Simba. Not only are there ties of friendship, but there is also an element of respect and reverence in both friendships. Horatio and Nala both know that they are friends and loyal followers of the rightful king.
We make personal choices about what and where to eat. The government is not going to eliminate the unhealthy food because we think it is the cause of obesity. Ultimately, we must decide to either stay away from unhealthy food or eat them in moderation. Despite all the efforts of education, media and guidance it doesn’t prevent us from grabbing that cheeseburger with fries on the way to work. In his essay “What You Eat Is Your Business,” Radley Balko argues that society should take full responsi...
...f her son. She starts to feel the poison and she warns Hamlet of it before she dies. It is too late though, the poisonous sword had cut Hamlet. In anger, Hamlet steals the poisoned sword and runs it into Laertes. He then charges Claudius and runs it into him. He also takes the wine and forces Claudius to drink from it. Both Claudius and Laertes die before Hamlet. Hamlet regains his throne for a few seconds, until the poison sets in and takes his life. The Lion King has a happy ending. Simba returns to his kingdom and he finds Scar. He tells Scar that he knows about his father’s death. Scar lies to Simba by telling him that the Hyenas were the ones who killed Mufasa. This upsets the Hyenas. They leave Scar to fight Simba by himself. Simba wins the fight and throws Scar off a cliff, into the herd of the Hyenas. The hyenas show no remorse for Scar and they trample over him, killing him. Once Simba takes back the throne, the whole kingdom becomes beautiful again and everyone is happy.
In Poe’s own life no durg could ever fully numb him to the pain of all his loses. His only true solace from his despair was in literature and his writings. Poe believed that visual art allowed the spirit to transcend the plane of reality to which it was stuck. In the Raven the narrator closely resembles Poe in this aspect. The narrator spends many a night reading long forgotten literature in an attempt to forget his own troubles after his loss. This is explained beautifully by Poe with the line “Eagerly I wished the morrow;- vainly I had tried to borrow, / From my books surcease of sorrow- sorrow for the lost Lenore.” (Poe 9-10) No matter how hard he tries; however he can shake the crushing despair that has a firm grip on his emotions. One dreary night the narrator gained an unsuspecting visitor. This visitor came in the form of a raven that flew into his window. The raven torments the man reminding him of his insecurities, his flaws, and his loss. The raven accomplishes all these things by rhythmically answering his pleas with but one word, to quote the raven “nevermore.” Just like the narrator will nevermore see the face of his dead love, he too will never be free from his despair. For as long as the man lives much like Poe he
Edgar Allen Poe was one of the greatest writers of the nineteenth century. Perhaps he is best know for is ominous short stories. One of my personal favorites was called The Raven. Throughout his works Poe used coherent connections between symbols to encourage the reader to dig deep and find the real meaning of his writing. Poe's work is much like a puzzle, when u first see it its intact, but take apart and find there is much more to the story than you thought. The Raven, written in 1845, is a perfect example of Poe at his craziest. Poe's calculated use of symbolism is at his best in this story as each symbol coincides with the others. In The Raven, Poe explains a morbid fear of loneliness and the end of something through symbols. The symbols not only tell the story of the narrator in the poem, they also tell the true story of Poe's own loneliness in life and the hardships he faced. Connected together through imagery they tell a story of a dark world only Poe Knows exists.
Concrete is one of the world’s most popular construction materials. Some six billion tonnes of concrete is produced each year in the world, making it approximately one ton of concrete for every human being per year (Fardis, 2012, p.116). However, the lifecycle of concrete does not make it the most sustainable building material at the moment. Because of limited natural resources, concerns over green house gases, and landfill problems, concrete production is being cut-back, or at least cannot be increased to keep up with population increase. In this essay, I will look at what makes concrete an unsustainable material and possible solutions to make concrete a more sustainable material.
Edgar Allan Poe?s ?The Raven? is a dark reflection on lost love, death, and loss of hope. The poem examines the emotions of a young man who has lost his lover to death and who tries unsuccessfully to distract himself from his sadness through books. Books, however, prove to be of little help, as his night becomes a nightmare and his solitude is shattered by a single visitor, the raven. Through this poem, Poe uses symbolism, imagery and tone, as well as a variety of poetic elements to enforce his theme of sadness and death of the one he loves.
Concrete is a composite material used widely in the construction industry. Concrete is basically a mixture of cement, water, aggregates and admixture (sometimes). Cement is a fine gray powder that consists of oxidizes calcium, silicon and aluminum. The aggregate used is normally gravel, crushed stone or sand. Admixture is a solid or liquid substance that gives a certain characteristics of the concrete. The cement reacts with water chemically and binds the aggregates together through a process called hydration during hardening or curing of concrete. It means that water helps in the hardening of the concrete while the cement bind the aggregate and also react with water to form a solid mass.
In these cases, such as building a reservoir, a huge number of concrete trucks are generally brought in in a caravan, and they pour their concrete into the forms that have been constructed onsite. In some cases, this order will put a concrete plant out of commission for a period of time due to the demand, and as such it must obviously be coordinated ahead of time.
century later by Charles Bacik and Bernard Fitzpatrick. In 1947, they set up a factory in