In the history of world water conservation, the three gorges dam in China is the most used concrete. If the concrete used in the main part of the three gorges project is made into a concrete block of 1 cubic meter, it can circle half of the earth's equator.Due to the large amount of use, it has produced the world's largest and most advanced concrete production system. 
The three gorges dam in the future is built with concrete, and the service life of the concrete is directly related to the service life of the three gorges dam, which has become the focus of the world.Start with rocks.The large granite is broken, cleaned and screened for many times and decomposed into large, medium and small stones, which are piled up in the warehouse.After ultra-fine broken small stone in the rod mill carefully grinding, become qualified sand.This is the world's largest artificial sand and stone production system.

Hard as iron concrete, its nascent period is very delicate.The external high temperature plus the heat generated when the cement sets, the temperature can reach 70-80℃, will make the new concrete crack or even scrap.The three gorges is located in the high heat zone, the high temperature season as long as five months, the temperature control and crack prevention of concrete has become a major event of the three gorges project.Through accurate calculation, the most economical and reasonable temperature of mixed concrete is 7℃, in order to reach this temperature, a series of measures must be taken to cool down.The sand pile effectively blocks sunlight radiation.The sand taken out from the bottom is more than 10 degrees cooler than the surface temperature.Sand and stone are fed into storage materials and cooled by circulating cooling air. The concrete of the three gorges relies on ice-making machine to produce a large amount of ice to cool down.More than 10, 000 cubic meters of concrete are poured every day in the three gorges project, which is capable of cooling at a controlled temperature.Poured concrete is also covered to keep heat from invading high temperatures.The quality supervisor takes the concrete's temperature like a nurse.During solidification, concrete needs to generate high hydration heat. On the one hand, water is sprayed to maintain body surface heat dissipation; on the other hand, circulating cold water is used to reduce internal temperature through buried cooling pipes.Bring the temperature down to 7℃.  

The 2.3 kilometer long three gorges dam is made of blocks of concrete.The three gorges dam is equipped with a water-tight copper plate, which is embedded into the adjacent concrete dam block to prevent the river water from seeping into the dam body.The copper sheet buried in the three gorges dam is more than 100 kilometers long.

According to incomplete statistics, there are tens of thousands of steel bars and deformation meters buried in the three gorges dam as well as various monitoring instruments, with a total value of hundreds of millions of yuan.They form a complete monitoring network and provide information about the dam continuously.The pantheon of volcanic ash, a primitive form of Roman cement, stood until 1800 years ago.Today, the three gorges concrete dam built with high technology will go through thousands of years of wind and rain to tell the story of the builders' achievements to future generations.

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