Concrete Lab Report Essay Example for Free

Concrete Lab Report Essay Engineering B45 Concrete Lab Report Introduction: Concrete is a mixture of sand and rock or similar inert material (aggregates) held together by a cementing material. Usually the cementing material is Portland cement, but sometimes binders such as asphalt or gypsum are used, in which case the concrete may be called asphaltic concrete or gypsum concrete. Properties of concrete are governed not only by the properties of its ingredients (cement, water, sand, and coarse aggregate) but also, to a great extent, by the relative proportions of these ingredients. The proportions must be so selected as to produce a concrete mixture of desired workability, strength, durability, and economy. The most common aggregates are gravel and crushed stone, although cinders, blast-furnace slag, burned shale, crushed brick, or other materials may be used because of availability, or to alter such characteristics of the concrete such as workability, density, appearance, or conductivity of heat or sound. Usually aggregate which passes a sieve with 0. 187-inch openings (No. 4 sieve) is called fine aggregate, but that retained by a No. sieve is coarse aggregate, although the division is purely arbitrary. If all the particles of aggregate are of the same size, or if too many fine particles are present, an excessive amount of cement paste will be required to produce a workable mixture; a range of sizes aids in the production of an economical mixture. The best concrete for a given use is usually the one which will provide the necessary strength and the desired wor kability at the lowest cost. Unless otherwise indicated, strength, as applied to concrete, refers to the ultimate compressive strength of the moist-cured concrete at the age of 28 days. Most concretes are batched to provide an ultimate compressive strength of 2500 to 4000 psi after 28 days. The figure below shows a typical strength curve of concrete with the passage of time. The modulus of elasticity of concrete is about 1000 times the ultimate compressive strength. The strength of concrete depends chiefly on the water-cement ratio, with a low ratio producing a strong concrete. While only a small amount of water is required to complete the chemical reactions of setting concrete, more than this is used to make the concrete more workable. The workability of concrete is usually measured by its slump. The standard method of measuring slump consists of placing the freshly-mixed concrete in a mold in the form of a truncated cone, 12 inches high, 8 inches in diameter at the bottom, and 4 inches in diameter at the top. The concrete is placed in the slump cone in three layers, each layer rodded thoroughly to compact it. When filled, the mold is immediately withdrawn by lifting it gently, and the slump of the concrete is measured at the vertical distance from the top of the mass to its original 12 inch height. An increase in the amount of mixing water will increase the slump, but it will also decrease the strength and increase the tendency of the ingredients of the concrete to segregate unless more cement is added. Increasing the amount of cement paste increases the cost, so all three factors- strength, workability, and cost-are interrelated in a complex way. Procedure: 1. Concrete mixtures are commonly given as volume ratios as cement: sand: gravel. You will make two concrete mixtures at ratios given to you by the instructor.

Embodying Ecofeminism Essay -- Ecofeminism Essays

Embodying Ecofeminism I felt a little strange the first day I walked into our class, mostly because I was somewhat of an outsider in a group who seemed to know each other. I sat down and listened as class began. I found it hard to focus on what was being said. Words seemed to rise and fill the room without creating any form that I could recognize. I listened hard and tried to engage myself in the dialogue. Some of the other students seemed involved, some resistant, trying to argue their own space into the dialogue. Sometimes ideas would surface that would resonate with me and pull me in; I could see that both students and professor cared deeply about the things I valued most. Yet, somehow we did not tap my core of questions with the theories and frameworks we used. Logical arguments assigning ethical values to objects, abstract theories that universally prescribe for every situation, disagreement and defense, philosophical examples of extreme situations of morality that described violence, incest, rape . . . with all these things I felt more and more alienated from the group. I, an opinionated and outspoken woman, felt silenced. Surely the group would welcome my contributions, but why did I feel so stifled? How could a discussion of ethics so completely embody what to me is unethical? I should have known that even something so intense and personal as values could be pinned down and violated by patriarchal Anglo thought. If I were a survivor of sexual abuse, I certainly would have fled the classroom, never to return, feeling violated once again, due to the needless description of violence and rape in the philosophical examples. This, a perfect metaphor for the use of conceptual frameworks which value patriarchal-style rational... ... use. It is not sufficient to discuss oppression and injustice in one section as separate from the other topics we explore. In every issue we will encounter marginalized groups who are victims of environmental injustice, and I fear we may be tempted to blame them for environmental devastation. In reality, they may know part of the solution we seek. I would also ask that we expand the frameworks we use to include non-dominant frameworks, so that members of our class are not systematically alienated parallel to the groups we may discuss. Let's keep in mind our context, as students living in the upper-middle class, Anglo, patriarchal society of an elite college, as people who are born into conferred dominance. I think we will be able to discuss environmental ethics in a way that is inclusive, pluralistic, contextual and holistic, as recommended by ecofeminist thinkers.

Individual Privacy vs. National Security

National Security has taken a new shape after the events of September 11, 2001, that is why I have selected the topic of Individual Privacy vs. National Security. I have selected this topic because of the amount of attention that has brought to this topic over the last ten years. There are many issues that the American people have with the government pushing what people believe cross privacy bounds thus causing court cases forcing policy changes. The ruling in the courts will affect how our government is able to gather information on possible terrorist threats while trying to keep the people’s rights protected. I plan on limiting the research by looking at key events that really have sparked the American people to uproar at the U. S. government. In looking at they more key events it will help to cut down the amount of hits that I will get in a search engine. The idea is that if certain issues really fire up the people then how will future bills or laws passed by the government be affected by pass rulings in the courts. In my paper I plan on looking into the Patroit Act and how this really affects what the government is allowed to do when they think someone is involved in terrorist acts. Also the other hot topic is that right now the government really does not need a warrant to track your cell phone using the different GPS signals. These are two of the biggest issues that could really help to shape current policy that the government uses to track people of interest. I am taking the side that there are times that the people of America need to give up some of their rights so that the government can protect them. It is a give and take relationship so there are times that both sides must find a common ground. Yet, there are times that the governments needs to have the ability to protect our national security at all cost.

The Negative Effects Of Post Traumatic Stress Disorder

When a man or a women returns from a combat deployment overseas they come and everyone is happy to see them, and this has been happening since the war in Iraq and Afghanistan wars started. But what they don’t realize is that that man or woman may not be so happy to be home but they don’t quite understand why. After past wars such as World War I this type of thing was called war fatigue and they were told they were fine. But this isn’t the cause in many men and women returning home from today’s wars. Post-Traumatic Stress Disorder can result from a number of different traumatic events, but the intensity and duration of some people’s reactions can be quite different but that also has many factors. The negative effects of Post-Traumatic Stress Disorder is affecting families and the effects it has on families of patients. Post-Traumatic Stress Disorder isn’t something new that has just appeared it’s something people have been dealing with for as long as we have understood what it really is. When a father or a mother comes home from war, their children might not understand why mom or dad is always angry now or why they yell so much, verbal abuse and physical abuse is something that has become very common in people with PTSD. With this the spouse or loved one may suffer the same or similar abuse while just trying to care for a loved one not understanding why they may be this way. Another one of many ways PTSD is affecting family’s is the divorce rates have gone up and aShow MoreRelatedPost Traumatic Stress Disorder ( Ptsd )1471 Words   |  6 PagesRunning head: POST-TRAUMATIC STRESS DISORDER 1 Post-Traumatic Stress Disorder Student’s Name Course Title School Name April 12, 2017  Post-Traumatic Stress Disorder Post-traumatic stress disorder is a mental disorder that many people are facing every day, and it appears to become more prevalent. This disorder is mainly caused by going through or experiencing a traumatic event, and its risk of may be increased by issuesRead MoreHolden Caulfield Is On His Own Psychological Journey1450 Words   |  6 Pagestriggered by the traumatic event of his brother, Allie, dying 4 years prior. The death of Allie has affected Holden in all aspects of his life, including friends, school, actions, and thoughts. This causes concern in Holden’s parents. They are concerned with his health and well-being, therefore send Holden to a rehab center. His parents fear that Holden may have Post - Traumatic Stress Disorder, and have him psychoanalyzed. So, Holden struggles with post-traumatic stress disorder because he showsRead MorePost Traumatic Stress Disorder is on the Raise Essay1155 Words   |  5 PagesPost-Traumatic Stress Disorder (PTSD) is defined as menta l health disorder triggered by a terrifying event (Mayo Clinic). This ordeal could be the result of some sort of physical harm or threat to the individual, family members, friends or even strangers (NIMH). While PTSD is typically associated with someone who has served in the military, it can affect more than just that genre of individuals. It could affect rape victims, victims in a terrorist or natural disaster incident, nurses, doctors, andRead MoreThe Effects Of Stress On Health And Mental Health Essay1619 Words   |  7 PagesOvercoming Stress Have you seen a mental health expert about a mental health disorder, or were you diagnosed for such a condition? Most people will answer no even if they had a mental or emotional health issue in the past. Heath includes physical health and mental health, it’s not just physical. A lot of people hate to admit that they have mental disorder, and they might even refuse to seek a professional health care. It’s really important for people to take care of any emotional or mental issueRead MoreA Brief Note On The Traumatic Stress Disorder1568 Words   |  7 PagesPost- traumatic stress disorder often get looked over by doctors and people go untreated. With passing time the fear might go away, but what happen when the constant fear take over. That was the case for a student in a psychology class I was taking. The instructor was going over anxiety and a young man told the class about how when he was in the army. The car he and some of the other soldiers was driving, they were do ing the daily drive they accidentally drove over a bomb that explode the front ofRead MoreEssay On Ptsd1510 Words   |  7 Pages The Use of Cannabis as a Potential Treatment For Post-Traumatic Stress Disorder Versus Currently Available Treatments HLTH 237: Introduction to the Study of Alcohol and Drug Problems - Assignment #2 Renpei Chen | 10141208 Queen’s University Post-traumatic stress disorder (PTSD) is a condition that can happen to anyone. About 7 or 8 of every 100 people will experience PTSD at some point in their lives and examples of people who are at an elevated risk are war veterans and assault victimsRead MorePost Traumatic Stress Dissorder Essay1155 Words   |  5 PagesPost Traumatic Stress Disorder, abbreviated as PTSD is an anxiety disorder that disrupts an individual’s memory, emotions, intellect as well as nervous response usually as a result of an extremely frightening, life threatening traumatic experience on oneself or another person usually. The experience may be harming physically or psychologically causing an interference with ones ability to cope with experiences that resemble the original trauma. The major symptoms characterizing PTSD include; anxietyRead MorePost Traumatic Stress Disorder ( Ptsd )1519 Words   |  7 PagesPost-Traumatic Stress Disorder It is common for individuals who have gone through a traumatic experience to feel many types of emotions, to include distress, fear, helplessness, guilt, shame or anger. The individual may begin to feel better after just a few days or weeks, but sometimes these feelings don’t go away. If the symptoms last for more than a month, they may be experiencing Post-Traumatic Stress Disorder or PTSD and should seek professional help. Post-Traumatic Stress Disorder, once knownRead MorePost Traumatic Stress Disorder ( Ptsd ) Essay1682 Words   |  7 Pagesdisastrous, and traumatizing events are often susceptible to developing a mental illness known as post-traumatic stress disorder or â€Å"PTSD†. People who are diagnosed with post-traumatic stress disorder often experience mind-numbing symptoms of traumatic flashbacks, emotional distress, and uncontrollable thoughts that can make living life a realistic nightmare. It is very important that this disorder is treated by using cor rect public health interventions to help individuals once again regain controlRead MoreMusic Therapy For Post Traumatic Stress Disorder1587 Words   |  7 PagesAbstract Traumatic experiences can cause sever anxiety and affective disorders in those that are affected. PTSD, or Post-traumatic stress disorder is such a disorder. This disorder is characterized by over sensitized arousal, hyper-vigilance, or exaggerated startle response. (Clark, 1997, pp. 27) This disorder can create problems with feeling and expressing normal emotions, and controlling anger and anxiety. Music therapy can help those affected with PTSD and other anxiety disorders by helping them