Gypsum made of building materials take a simple long history

Gypsum made of building materials take a simple long history

Source: China Industrial Network

As we all know, energy conservation in the building there is still a great potential for development, nearly 40% of the energy use and the building. Gypsum building materials as a recognized environmental protection building materials, by more and more attention, its application in the construction of the scope of science and technology support is gradually expanded, large and complex high-tech content system, small to facilitate the use of the public installation Simple parts, can find the figure of gypsum. Gypsum is in its own advantage to help people build more and better environmental protection building.

Take a simple history

Gypsum is a kind of mineral which is ubiquitous in the crust, shaped like rock, usually white, colorless or gray. According to industry insiders, access to gypsum slurry process is not complicated. From the crust layer digging gypsum mine, after a specific heat treatment to the ore part of the dehydration, and then after grinding to form a small white powder, this powder is usually referred to as "plaster", water will become hard after drying.

As early as 9000 BC, humans have been able to handle gypsum plaster and alabaster for construction and decoration. The gypsum was found in the underground frescoes of the Chuck site in Asia. Gypsum plaster was also found in the gypsum-based ground self-leveling layer, which was formed in 7000 BC. According to archaeological discoveries, during the period of the Pharaoh rule in Egypt, it had used plaster as a mud to build the pyramids of Zipps (3000 BC). By the Middle Ages and the Renaissance, many ornaments and works of art were made of gypsum. In China, as early as 2000 years ago, gypsum is used for the construction of Changsha Mawangdui Han Tomb.

It can be seen that the application of gypsum in architectural decoration has existed since ancient times, and with the progress of technology, gypsum in the field of construction in the field of continuous expansion.

Good performance advantages

Gypsum itself has a good performance, very suitable for a variety of construction systems.

First of all, gypsum has a good fire performance, effectively ensuring the safety of the building. Gypsum is an inorganic material that is incombustible. The final hydrated product calcium sulfate dihydrate contains two crystal water, the decomposition temperature of about 1070 degrees Celsius to 1700 degrees Celsius between. Therefore, when the fire, only to wait until the two of the crystallization of water after all the decomposition is completed, the temperature can be in the 1000 degrees Celsius on the basis of the continued increase; and in its decomposition process generated a lot of water vapor can also flame The spread of the barrier role.

Second, gypsum is a long and short material, is conducive to automatically adjust the indoor humidity. According to reports, with natural gypsum production of gypsum building materials, the water cream is generally between 0.6 to 0.8. After hydration and hardening, a large amount of free water will be evaporated, leaving a large number of pores in the product to form a porous material, the bulk density of less than 1.0.

Gypsum building materials of the porous advantage is also reflected in: when the indoor humidity, these holes can be inhaled water; the other hand, the indoor humidity can be released when the pores of the water out, automatically adjust the humidity inside, make people feel comfortable.

Third, the production process is simple and flexible, can fully meet the requirements of various functions of the room. Gypsum building materials for indoor roof, wall, ground, through the selection of different varieties and different combinations of construction, respectively, to meet the indoor insulation, sound insulation, fire, water, flexible separation and other functional requirements, but also a good indoor decoration material.

Green energy saving recycling

Gypsum building materials is a kind of energy saving, materials, recyclable, do not pollute the environment, the advantages of superior quality green building materials.

According to experts, the construction of gypsum is made from dihydrate gypsum, hydration and then become dihydrate gypsum. Waste gypsum building materials, broken, screened, and then calcined after the production of gypsum as raw materials, do not produce construction waste.

Building gypsum sintering process is dihydrate calcium sulfate off 3/4 of water, into a half water calcium sulfate, the discharge of the "exhaust" is the water vapor; all kinds of gypsum building materials production and application process are not Emissions of waste gas, waste residue, waste water and harmful substances on the human body, does not pollute the environment.

The situation shows that gypsum building materials is not only a very good performance of building materials, but also a very comprehensive green building materials, fully in line with the principles of circular economy and sustainable development should be vigorously promote the use.

Mature technology prospects

Due to the good characteristics of gypsum building materials, in the western industrial developed countries generally received attention, get a lot of applications. At present, almost all of the interior walls of Japanese and Japanese houses use gypsum plasterboard, and Europe, Asia and other regions, the application of gypsum board wall is also more common.

According to statistics, the current developed countries, the use of lightweight new wall materials has reached 85 %%, of which light wall board market share of about 50%, these light wall is basically based on gypsum. Especially in the United States, gypsum wallboard has accounted for 70% of the total wall, per capita use of gypsum wall board area of 10 square meters. Moreover, in Asia and Africa and many other developing countries, the use of lightweight wall panels also increased to about 30%.

China gypsum building materials products

There are two main categories: plate gypsum products and decorative gypsum products, including paper gypsum board production both a scale and a level, is Chinas interior decoration materials, one of the main products. But the current per capita possession is still less than 0.5 square meters, and mainly as decoration materials for the ceiling, etc., only a very small amount of public buildings for the wall material. Although in recent years gypsum block and all kinds of building gypsum powder material is an unprecedented rate of growth, but our per capita possession of gypsum building materials is still much lower than Europe and the United States and other countries.

Fortunately, Chinas gypsum building materials in recent years has made rapid development. At present, foreign products, China has basically mastered its production technology and equipment manufacturing technology, once the market has been developed, with a relatively short period of time to form a large-scale industrial production capacity. Moreover, the main products have been developed national standards or industry standards, product quality is evidence to follow.

In short, gypsum products with significant green building materials features: sustainable, recyclable, low use of raw materials, but also can improve the living standards, such as fire, noise, heat insulation. And gypsum product logistics and ore management level of continuous improvement can reduce carbon dioxide emissions. These features are one of the most widely used materials in all types of buildings around the world.