CONCRETE MIXING. INTRODUCTION. Concrete is a composite material usually made up of three main components: water, aggregate (fine and coarse aggregate) and Portland cement. Fine aggregates fill the spaces between the coarse aggregates while cement in the presence of water forms cementitious material, which binds the aggregates together. Concrete exists in two states, fresh concrete, and hardened concrete. The properties and characteristics of concrete are functions of the raw materials used as well as the mix proportions. CONCRETE MIX DESIGN Concrete mix design is used to achieve mixes on an empirical basis since it’s not possible to determine the strength of concrete correctly using properties and proportions of the mix components (Day 2003). Mix design ensures that the concrete bears the specified properties both in the fresh and hardened state. The weight ratio between water and cement is the most important design variable. Its ratio is referred to as a water /cement ratio (W/C). Typically, the w/c ratio should vary between 0.4-0.6 because excess water reduces the strength of concrete, and too low w/c ratio lowers the workability of concrete.…
Lesson from Crisis Student’s name Course code Institutional affiliation Date Lesson from Crisis In societies and organizations, it is evident that crisis is costly from the perspectives of economic and socio-organization. Lesson from the crisis is the measures that managers should take before a specific crisis erupts and get the organization or society unaware. The crisis has brought the internet increase in the argument of organization learning in any emergency such as epidemic and pandemics, which can either be war or even natural disasters such as drought and flooding. The question now is if the managers of the organization have been able to focus on the optimistic vs pessimistic perspective and if they can learn from the crisis. Importance of this study to the manager and society is that it sheds light on the nature of learning from the perspective of crisis management. The managers must learn about the past crisis to tackle any crisis in future. This now brings the question: if the…
The video talks about global warming and how it affects climate change. Oceanographer Josh Willis sheds light on how billions of tonnes of carbon dioxide and other greenhouse gases are emitted to the atmosphere leading to global warming. The greenhouse gases in the atmosphere cause extra heat on earth. The extra heat is supposed to go out of space, but it remains in the atmosphere. The trapped heat, therefore, warms the planet. The trapped heat on earth also affects the oceans. Willis further argues that most of the trapped heat on earth, which is about 80 to 90 percent goes to the oceans. The reason for this is that the ocean can absorb 1000 times the heat as the atmosphere. It can achieve this without changing much of its temperature. The ocean can achieve the high absorption of heat through its high heat capacity. The video consequently portrays a demonstration of the high heat capacity characteristic of the ocean in comparison to the low heat capacity of the atmosphere through an experiment. Willis places a lighter representing the sun near…
The Benefits of Using Sustainable Concrete Sustainable concrete refers to a hunk of concrete that utilizes less energy during production and produces minimal carbon dioxide as compared to the regular concrete. Structures that are constructed using sustainable concrete have minimal societal impacts during the life cycle. There are numerous benefits of using sustainable concrete. The first one being minimal Carbon (iv) oxide emission during its productions, which results in increased environmental quality. Since the manufacture of cement causes significant release of CO2, a greenhouse gas which contributes to environmental issues (Gautam, Krishna & Srivastava, 2014). Through the use of sustainable concrete, the environmental impacts are minimized as it also reduces the depletion of natural resources through the use of secondary raw materials as and urban mining. Transportation of the materials to the construction site is also reduced as it enables recycling on the site, thereby reducing the greenhouse gas effect. Furthermore, the concrete meets the performance requirements of the contractors and producers. The concrete has low inherent energy requirements whereby little wasted products will be produced as it is made…
how the plates and the continents are pushed and pulled around the earth’s surface to form mountains, volcanoes, and the distributions of the earthquake The earth is made up of shells that are divided into several plates that glide over the mantle, which is the rocky layer above the core. This theory describes how the plates and the continents are pushed and pulled around the earth’s surface to form mountains, volcanoes, and the distributions of the earthquake. These plates are made up of lithosphere. The plates meet and form a plate boundary where a different geological activity such as mountain building and earthquake occurs. There are three forms of plate tectonics. Each of the plate tectonics differs in the way in which the glides move. One of the forms is the divergent or constructive plate boundaries. Here, a crust is produced when the tectonic plates move away from each other. When it occurs in a continent, the magma rises to cause it to become thinner and split to form a crust, which creates an ocean between the continents. The second…
Analytical Summary of “How tosspot a Liar” “How to Spot a Liar” is a TedTalk done in the year 2011 by Pamela Meyer, an author, fraud detector, and an entrepreneur. In the talk, Meyer discusses How to Spot a Liar. She explains why people lie and how to spot it by using many examples of the difference between lying and telling the truth. Meyer gets a hold of her audience by use of appropriately educative tone, ethos, logos and pathos, and repetition. A successful speaker opens their session in a way that permanently captures the attention of the audience. Meyer was excellent in how she started her session. She instills curiosity by mentioning that everybody’s neighbor in the room is a liar. Meyer develops her claim by starting with expressing to the audience that everyone is a liar because everybody has told at least one lie in their lifetime at some point. She uses an educative tone that maintains the attention of the listeners. Meyer perfectly helps the audience conceptualize deceit by defining and contextualizing it. For instance, she…
.Sustainable Development Strategy, 1997-2001 Safeguarding our Assets, Securing our Future Executive Summary Natural resources epitomize the very essence of sustainable development. Few sectors have more direct impact on the natural environment. Yet few are more integral to the economic and social well-being of every region in Canada. Sustainable development – the integration of environmental, economic and social considerations – necessarily means reconciling sometimes competing interests when deciding whether and how development should proceed. It requires that we factor in social concerns such as health, equity and community sustainability when making environmental and economic decisions. In a country as resource dependent as Canada, this is a major challenge. Resource development is crucial to the Canadian economy, generating $95 billion or nearly 14 per cent of Gross Domestic Product and 38 per cent of this country’s exports. The energy, mining and forestry sectors employ 0.75 million people across the country. Natural resources provide the essential raw materials for products used by all segments of society, from the lumber to build our houses and metals to manufacture machinery, to the oil and natural…
The Road by Cormac McCarthy’s Dystopia Dystopia is an imaginative state of a society where there is great suffering or injustice and commonly following a totalitarian leadership or post-apocalyptic occurrence., M.H. Abrams defines dystopia as the ‘bad place’. According to Mouda, Asra Sultana, the term has come to be applied in many works of fiction representing a very unpleasant imaginary world whereby dangerous tendencies of humankind get projected in a disastrous future culmination (218). Rendering to this explanation by MH Abraham, the “ominous tendencies” of our present world have been projected in Cormac McCarthy apocalyptic world. The Road by Cormac McCarthy’s narrates a post-apocalyptic tale of a father and son who journeys in the harsh desert following the aftermath of the world’s collapse. Additionally, the language and style of The Road vividly reflect on the ominous world created by the author in the novel. Despite an exciting plot, McCarthy fails to illustrate the events that lend to the apocalypse where the boy and the father are the sole survivors. He narrates to us very little on what brought about the…
‘dynamic’ nature of the anxiety caused by conflict between the id, ego and superego e ‘dynamic’ nature of the anxiety caused by conflict between the id, ego and superego (McLeod 1998: 32-33). Specific techniques include free association and resistance interpretation – encouraging the client to say whatever freely comes to mind and analysing areas of defensiveness; dream analysis – dreams seen as uncensored thoughts from the unconscious; and transference – allowing the client to project feelings onto the therapist. Burgeoning from the classical psychoanalytical school are two philosophies conceived in the latter part of the twentieth century known as Object Relations and Attachment Theories. Corey (1991: 111-114) explains that Freud applied the word ‘object’ to define any person or thing embraced, usually by a child, as the ‘target of feelings or drives’. Melanie Klein developed the Object Relations Theory as an extension of this original hypothesis. The theory describes the enigma precipitated by the child’s need to direct all emotions at one ‘object’ – usually the mother or primary caregiver – and its inability to integrate the simultaneous concepts of…
Article Review:This is Water “This is Water” by David Wallace is a speech that was given by Wallace during a graduation ceremony at Kenyon College in Gambier. The author uses emotional appeals and logical appeals to highlight the importance of thinking critically. In the speech “This is Water,” David uses the term “conscious” to refer to the people who think critically, and he uses the term “unconscious” to refer to the people who do not apply critical thinking while making their decisions. In the analysis between critical thinkers and uncritical thinkers, Wallace ignores possible ethical arguments that contribute to the societies where members think critically. “This is Water” is a commencement speech by Wallace that is concerned about how critical thinking affects day to day activities of individuals. The commencement speech “This is Water” by David Wallace starts with a story of two young fish that comes across to an older fish. The story of the fish is used by the author to illustrate the importance of critical thinking in daily activities. The older fish nods at the two…