Cc 203 Concrete Technology : Test 1

Kelebihan konkrit adalah kukuh, kos yang murah, dan mudah didapati. Namun, konkrit tidak ringan seperti bahan-bahan lainnya.

The given examples are all structures or objects made of concrete, except for "Simen fero" which is not a concrete structure.

The given answer accurately defines concrete as a material that is produced by mixing cement, fine aggregate, coarse aggregate, and water in specific proportions and allowing it to harden to form structural elements.

The number of workers is not a contributing factor to the quality of concrete. Quality of materials, mixing ratio, and curing are all important factors that can affect the quality of concrete. However, the number of workers involved in the process does not directly impact the quality of the concrete produced.

The correct answer is 1 : 3 : 4. This is because the ratio 1 : 3 : 4 is not a basic mixture ratio. In a basic mixture ratio, the numbers should be in their simplest form, meaning that there should be no common factors between them. In this case, the numbers 1, 3, and 4 have a common factor of 1, which means that the ratio can be simplified further. Therefore, it is not a correct basic mixture ratio.

The correct answer is "Stor dan silo." This is because both stor (storage) and silo are methods of storing cement. Stor refers to a general storage facility, while silo specifically refers to a tall cylindrical structure used for storing bulk materials such as cement. Therefore, both stor and silo are correct methods of cement storage.

The statement is true in the context of the development of concrete technology. It states that concrete is capable of bearing heavy loads and has excellent resistance to damage caused by acid attacks. This suggests that advancements in concrete technology have allowed for the creation of stronger and more durable concrete structures, making it a suitable answer in the context of the statement.

The correct answer is "Proses basah dan kering." This is because the production of cement involves two main processes: wet process and dry process. In the wet process, raw materials are mixed with water to form a slurry, which is then dried and heated to produce cement clinker. In the dry process, raw materials are ground and mixed to form a fine powder, which is then heated to produce cement clinker. Both processes are commonly used in cement production, making the answer "Proses basah dan kering" the correct choice.

The correct answer is "Tapak tembok dalam peparit bagi kerja tanah keras." This means that the 1:5:10 concrete mix ratio is used for creating a strong foundation for walls in excavated trenches. The mixture is specifically designed to withstand the pressure and load from the surrounding soil, providing stability and support for the walls.

The given list mentions different types of Portland cement, but the one that is not included is "Simen portland haba" which translates to "heat Portland cement". This type of cement is specifically designed to generate less heat during the hydration process, making it suitable for large concrete structures that are prone to cracking due to high temperature.

The correct answer is "Menyimpan simen di tempat yang sepatutnya." This is because storing cement in the appropriate place is not one of the main processes in cement manufacturing. The main processes include crushing raw materials to pass through a sieve number 100, mixing raw materials according to the appropriate mixture ratio, and heating the mixture to form initial guidance in the form of gravel.

The correct answer is "Air dicampur dengan simen menghasilkan tindakbalas kimia hidratan, ianya menjadi pasta simen dan seterusnya dicampurkan dengan batu baur, maka terhasillah konkrit." This answer correctly describes the process of making concrete by mixing water with cement to form a chemical reaction that produces a cement paste, which is then mixed with aggregate (in this case, batu baur) to create concrete.

The correct answer is "Ujian kelodak dan tapak tangan." This is because the question states that there are two types of fine aggregate tests, and the options provided are combinations of "kelodak" and "tapak tangan" with "hentaman." The correct combination is "kelodak" and "tapak tangan," as mentioned in the question.

The correct answer is "Batu baur halus (pasir) mestilah diperolehi dari sungai sahaja." This statement is incorrect because fine aggregate (sand) can be obtained from various sources, not just from rivers. It can also be obtained from quarries or crushed rock.

The correct answer is "Ujian Vebe Consistemeter." This is because the question asks for the exception among the given types of coarse aggregate tests. The other three options, namely Ujian hentaman, Ujian Kehancuran dan nilai pecah, and Ujian pemeringkatan batu baur, are all types of tests for coarse aggregates, while Ujian Vebe Consistemeter is not related to coarse aggregates.

The correct answer is "Air menyebarkan simen supaya setiap butir batu diliputi dengan rapat." This is because water helps to distribute the cement evenly, ensuring that every stone particle is fully covered. This is important for the strength and durability of the concrete mixture.

The correct answer is "Luas permukaan yang besar." This is because the other three options are characteristics that are true about aggregate stones. They include the strength of the stone and its bonding, the size of the particles and their distribution, and the requirement for the hardness to be greater than that of cement. However, having a large surface area is not a characteristic of aggregate stones.

Concrete is known for its ability to harden with the presence of water and can be molded according to the desired shape. It is also resistant to rust and corrosion. However, concrete is not known for its heat resistance and flammability. Therefore, the correct answer is "Tidak tahan panas dan tidak terbakar" (Not heat resistant and not flammable).

The correct answer states that cement is a material produced by burning a mixture of limestone and clay, and it has cohesive and adhesive properties. This explanation accurately describes the definition of cement and how it is made, emphasizing its ability to stick and bind materials together.

The use of steel bars placed in the construction of concrete structures can increase the load-bearing capacity of the concrete. This technique is popular and often advanced, especially for wide spans. To reduce the dead load of a building, good insulation properties are needed for the construction of insulation walls. Therefore, all of the above statements are correct.