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1、公司 Unit 8 Building Materials 建筑材料 DialogueDialogue Passage APassage A ExercisesExercises ObjectivesObjectives 单击进入 单击进入 单击进入 单击进入 Teaching Steps ObjectivesObjectives 3.Introduce some reading skills 1.Tell us how to pour concrete and how to cure it. 2.Talk about various types of cement. 主菜单 DIALOGUE
2、A: Concrete is a building material of modern times. When did it appear? B: I am afraid you made the same mistake as many people do. As a matter of fact, its history began with the Romans, who used it to build their aqueducts and amphitheatres. Colosseun in Rome Pantheon in Rome 主菜单 A: As far as I kn
3、ow, concrete is a mixture of water , gravel and sand with Portland cement. As the workmen are concerned, adding plenty of water makes placement of the concrete easier. B: You must remember that the greater the proportion of water in water-cement ratio is, the weaker the final concrete will be. When
4、an excessive amount of water has been used, there will be an excessive number of voids, which may cause the concrete to leak badly. DIALOGUE 水灰比 A: Oh, I see. How Can it be cured ? B: The time during which concrete hydrates and increases in strength is its curing period. Throughout the curing period
5、, therefore, all the exposed surfaces of the concrete must be kept moist. Only in this way will the concrete become increasingly stronger, denser and more impervious to water. DIALOGUE 养护期 A: How long is the curing period? B: The concrete must be kept continually moist for 14 days and longer if at a
6、ll possible. water gravel sand 混凝土的组成 the composition of concrete cement 混凝土的养护 concrete curing The surface is covered to keep it moist. DIALOGUE 1. material: with which something is made 2. cement: grey power (made by burning lime and clay) which, after being wetted, becomes hard and is used for bu
7、ilding Words and Phrases 3. aqueduct: a structure of carrying water, usually built like a bridge across a valley or low ground 4. amphitheatre: a circular building without a roof and with rows of seats that rise in steps around an open space, often used in ancient Greece and Rome for public entertai
8、nment 5. Portland cement: a name of place in America where it is famous for its cement 返回 返回 返回 返回 返回 8. hydrate: chemical compound of water with other substances 9. curing period: the time during which concrete hydrates and increases 10. moist: wet 11. impervious: not allowing the water to pass 6.
9、proportion (普通硅酸盐水泥，这是最便宜的) (2) Rapid-hardening cement, which is slightly more expensive than(1); (快硬水泥，比普通硅酸盐水泥略贵) (3) Sulphate-resisting cement; (耐硫酸盐水泥)concrete Lang-church in France Building Materials (4) Air-entraining cement which greatly improves the frost resistance of the concrete.; (加气水泥，大
10、大改善混凝土的抗冻性) (5) Low-heat cement for massive construction such as dams; (低热水泥，用于大体积建筑，如大坝) (6) High-alumina cement, which reaches a Portland 28-day strength in 24 hours with corresponding high heat. Its color is normally black. (高矾土水泥，通常为黑色，高矾土水泥经过24小时即可达到硅酸 盐水泥28天内才能达到的强度，同时发出高热) (7) Another high-al
11、umina cement, which is used for furnace linings, is white. It is several times more expensive than the black variety. (用作炉衬的高矾土水泥，呈白色，它比黑色高矾土水泥要昂贵几 倍。) Building Materials The above-mentioned cements are widely used on the construction site. Now lets talk about pipes. Pitch fiber is an easily joined
12、pipe and it is as strong as stoneware pipes, but it is not so resistant to all corrosive or hot liquids. Asbestos cement pipes, on the other hand, can be used for liquids with almost any purpose. The more expensive sheet is nailable, almost as strong as wood and fully fireproof. The cheaper sheet is
13、 easily broken by shock or pressure or under the effect of a frame. Plastics have been widely used for a variety of accessory roles in buildings including panels, drainpipes and decorative ceilings. Building Materials pitch fiber pipeasbestos cement sheetplastics sheet Composite materials are gainin
14、g importance in building homes. A modern material in house building is glass-reinforced polyester resin. Panels of this material are composites themselves. Materials used for doors and window frames are timber, steel and aluminum alloys. wooden windows wrapped with aluminum 铝包木窗 plastic-steel window
15、s 塑钢窗 aluminum windows 铝合金窗 Building Materials EXERCISES 1. The weather forecast says that there will be a heavy _ here tomorrow. 2. The people in the area floods. 3. These houses catch fire easily as the building materials arent . 4. As everybody knows, iron easily. 5. The doctor and nurses are wor
16、king hard to . the disease spreading. 6.Tall building are popular reasons. 主菜单 .Complete the sentences. frost for a variety of are suffering form fire proof rusts prevent from .Translate the following words or phrases into English. 1.building materials 2.plumbing system 3.heating equipments 4.lighting equipments 5.Portland cement 6. construction site 7. pitch 8. asbestos 9. composite materials 10. aluminum all
