I don't know yet: readers of the materials of the Great Wall, the following small edition will give you a detailed introduction, and then read on~
In 1796, Englishman Parker burned the brown Roman cement with marlstone. In 1824, British construction worker Joseph Aspen invented the cement and obtained the patent of Portland cement. Before that, cement was a myth. However, without cement, the Ming City Wall lasted 600 years, but it was still impregnable. Why? Materials Modern people are reluctant to use it.
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1357年，谋臣朱升向朱元璋建议“高筑墙，广积粮，缓称王”，朱元璋觉得，因而采纳，朱元璋建立 后便下令普遍筑城， 明城墙始建于1366年，历经28年，于明洪武廿六年(1393年)完工。
In 1357, Zhu Sheng, a counselor of the Ming Dynasty, suggested to Zhu Yuanzhang that "build walls high, accumulate grain widely, and become king slowly". Zhu Yuanzhang felt that it was adopted. After the establishment of the Ming Dynasty, Zhu Yuanzhang ordered the general construction of the city. The Ming city wall of Nanjing was built in 1366, after 28 years, and completed in the 26th year of Hongwu (1393) of the Ming Dynasty.
According to records, 280000 migrant workers have invested in the construction of the Ming City Wall in Nanjing, about 350 million bricks. It is the longest, largest and best preserved ancient city wall in the world. It was incorporated into the world record association's world's largest city wall, and the Ming city wall can stand up to now only because the Ming people used these materials.
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Rammed earth is to compact the earth and make very solid mud blocks, which are even stronger than bricks and stones. The Ming city wall uses both bluestone bricks and rammed earth. Rammed earth is used inside the city wall and bluestone bricks are used outside for further stabilization. In addition, in order to prevent Jerry building and craftsmen from perfunctory work, every brick and stone is engraved with the name of the worker in charge Come on, this Ming city wall can resist the cannon stone.
Rammed earth has a long history of use. It has been used on a large scale since the 1950s and 1960s. Celebrities of the period once said: "Shun hair is in the area of mu, and it is held between the plate buildings." Plate building is about ramming earth technology.
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There is also a kind of material in the Ming city wall, which even the modern people are reluctant to use, that is, glutinous rice. Although there was no cement concrete at that time, the special concrete was made of glutinous rice, hydrated lime and limestone, which became very sticky and was the main bonding material, so that the bricks and stones of the Ming City Wall would not be damaged for a hundred years.
To this end, it is recorded in the book "Xiangmu" and the reservoir are divided into two parts, namely, the river sand and the loess, the glutinous rice and the nectar of yangtao and rattan are mixed evenly. After being built firmly, it will never be damaged. It is called Sanhe soil.
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As we all know, glutinous rice is a kind of food crop, or a very nutritious food. According to compendium of Materia Medica, glutinous rice, as a traditional Chinese medicine, has the functions of warming the spleen and stomach, stopping deficiency, cold and diarrhea, reducing stool, collecting self perspiration and making acne. Nowadays, it must be reluctant to use glutinous rice in wall construction.
The scale of the Ming city wall is not small. We can also know that in order to build the city wall, many glutinous rice crops were used, which caused great pressure on the people. In fact, the use of glutinous rice for construction did not start in the Ming Dynasty. It can be traced back to 1500 years ago, when construction workers mixed glutinous rice with hydrated lime and limestone to make paste, which is called "glutinous rice mortar", mainly used for building tombs and treasures Towers, walls, etc.
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The first emperor of Qin ordered the construction of the Great Wall, which has been standing for thousands of years. It is also because of the use of glutinous rice, a precious material. Only the king can order the use of glutinous rice for large-scale construction, but it makes the tax for hundreds of years serious. However, it also shows that China's ancient architectural technology is advanced. From the cultural relics that still exist for thousands of years, we can see the wisdom of the ancients and the working people Diligence. ,
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