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Construction Material of Great Wall
The Great Wall of China was the only man made object that can be seen from outerspace with the naked eye. Great Wall really is a great masterpiece of mankind. The following is the info about Construction Material---Bricks.Before the use of bricks, the Great Wall was mainly built from earth, stones and wood. Due to the large quantity of materials required to construct the Great Wall, the builders always tried to use local sources.
Bricks were used in a lot of areas during the Ming Dynasty, as well as materials such as tiles and lime. Attempts were always made to produce the materials locally, so kiln workshops were established to burn the crude material. In a construction team there was Material Supply Department. For example, in Juyongguan Pass names of supply departments such as kiln workshops, stone ponds and material supply departments were recorded. Some materials, such as the timbers for the construction of the passes, did have to be transported from outside areas when there were none available locally.
Bricks were more a convenient material than earth and stone as their small size and light weight made them convenient to carry and thus quickened the speed of construction. Bricks are also the ideal material to bear the weight. According to a sample experiment experiencing gravity and erosion over a hundred years, the compressive strength, resistance to freezing and absorbency of the bricks of the time are similar to today's common bricks. A huge brick from a hundred years ago showed a high level of technological skill for that time. For further ease of construction, different shapes of brick were also burned and made to stuff into different positions.
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