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2010-08-24
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TTÜ Tartu kolledz Durability of concrete Tauri Must Tartu 2009 Main Content Cement Aggregate Sand Water Chemical admixtures Field of application Concrete is used in... · Pavements · architectural structures · Foundations · roads · Bridges · marine- and parking structures · brick/block walls · footings for gates fences Three Georges Dam · The world largest concrete construction · China, river of Yangzte, 2006 · 2,335m long, 101m high Possible threats Physical Chemical · Frost · Sulftates, · Wind · Sea water, · Waves · Acids, · Fire · Alkali-silica reactions Primary transport mechanism through concrete Gas diffusion Water vapour diffusion Water vapour diffusion Ionic diffusion Water absorption Io
Introduction (slide 2) In this presentation I'd like to give a brief overview of clay bricks. I'll speak about 15min to allow time for questions at the end. Firstly clay bricks are known for centuries as one of the most solid and reliable structural elements is set to play a role in reducing global warming. Apart form the many benefits obtained from using clay bricks in construction, such as their durability, insulation properties and aesthetic qualities, recent findings show that they also produce less carbon emissions than any other masonry material. History (slide 3) In more detail the earliest bricks were dried bricks, meaning they were formed from clay- bearing earth or mud and dried usually in the sun until they were strong enough for use. The oldest discovered bricks, originally made from shaped mud and dating before 10000 BC, were found in Mesopotamia related to the first known cities. Ceramic or fired bricks were first introduced by the Romans. These were mainly flat, broad
Foreword Bridging rivers, gorges, narrows, straits, and valleys always has played an important role in the history of human settlement. Since ancient times, bridges have been the most visible testimony of the noble craft of engineers. A bridge can be defined in many ways, but Andrea Palladio, the great 16th century Italian architect and engineer, hit on the essence of bridge building when he said "...bridges should befit the spirit of the community by exhibiting commodiousness, firmness, and delight." In more practical terms, he went on to explain that the way to avoid having the bridge carried away by the violence of water was to make the bridge without fixing any posts in the water. Since the beginning of time, the goal of bridge builders has been to create as wide a span as possible which is commodious, firm, and occasionally delightful. Spanning greater distances is a distinct measure of engineering prowess. In terms of engineering, b
SISUKORD ENERGY STORY................................................................................................................4 USES OF ENERGY............................................................................................................. 4 2.1 Uses of energy in homes...............................................................................................5 2.2 Types of energy used in homes.................................................................................... 6 2.3 Energy use in different types of homes........................................................................ 6 2.4 Commercial Energy Use...............................................................................................9 2.5 Industrial and Manufacturing Energy Use..................................................................11 2.6 Transportation Energy Use.........................................................................................12 RENE
1 Grammatical Terminology PRACTICAL ENGLISH GRAMMAR FLGR.01.042 Grammatical Terminology analytic analüütiline (= uninflected - grammar is focused in the sentence , e.g. English) synthetic sünteetiline (= inflected - grammar is focused in the word, e.g. Estonian, Latin, Russian, Old English) ending lõpp (käände- ja pöördelõpud) marker tunnus (mitmuse, oleviku, lihtmineviku, tingiva kõneviisi, käskiva kõneviisi, kaudse kõneviisi, umbisikulise tegumoe, ma- tegevusnime, oleviku kesksõna, mineviku kesksõna) derivational affix liide, tuletusliide, tuletusafiks (e.g. postwar, anti-American, wiser, greenish) parts of speech sõnaliigid English Estonian Definition
The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind. Two Chernobyl plant workers died on the night of the accident, and a further 28 people died within a few weeks as a result of acute radiation poisoning. The April 1986 disaster at the Chernobyl nuclear power plant in the Ukraine was the product of a flawed Soviet reactor design coupled with serious mistakes made by the plant operators. It was a direct consequence of Cold War isolation and the resulting lack of any safety culture. The accident destroyed the Chernobyl 4 reactor, killing 30 operators and firemen within three months and several further deaths later. Acute radiation syndrome was originally diagnosed in 237 people on-site and involved with the clean-up. Of these, 28 people died as a result of it within a few weeks of the a
1 Wave energy Introduction to wave energy There are several possibilities to harvest different forms of energy from the sea. One of these options is the usage of waves for the generation of electricity. The devices needed to perform this task are called wave energy converters. Wave energy is indirect solar energy in twice. At first there is the wind, which is caused by variations in atmospheric pressure due to a differential solar heating of earth's surface by the sun. Different regions of pressure drives a force which rises a movement of atmospheric air masses that causes the earths wind system. If wind strikes over the surface of an open water, waves are induced. First they are very flat with only a low level of energy. When there is a long distance over the water on which wind can attack the small ones, they became bigger and bigger with a lot of energy inside them. Physics of wave energ
EHITUSTEADUSKOND Ehitustootluse instituut KUIDAS MUUDAB MUDELPROJEKTEERIMINE TERASKONSTRUKTSIOONIDE PROJEKTEERIMIST, VALMISTAMIST JA EHITAMIST? HOW ARE 3D AND BIM CHANGING THE DESIGN, FABRICATION AND CONSTRUCTION OF COMPLEX STEEL STRUCTURES? EPJ 60 LT Üliõpilane: Tanel Friedenthal Juhendaja: Prof. Roode Liias Kaasjuhendaja: Prof. Carrie S. Dossick Tallinn, 2010.a. Olen koostanud lõputöö iseseisvalt. Kõik töö koostamisel kasutatud teiste autorite tööd, olulised seisukohad, kirjandusallikatest ja mujalt pärinevad andmed on viidatud. …………………………………………….. (töö autori allkiri ja kuupäev) Üliõpilase kood: 041399 Töö vastab magistritööle esitatud nõuetele …………………………………………�
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