1) security
Safety mainly refers to excellent fire resistance. Gypsum, cement concrete, bricks and other inorganic materials are nonflammable. The difference is that its final hydration product, calcium sulfate dihydrate (CaSO4? 2H2O) contains two crystal waters, and its decomposition temperature is about 100℃ to 170℃. In case of fire, the temperature will continue to rise on the basis of 170℃ only after the two crystal waters are completely decomposed. Moreover, a large number of water vapor curtains produced in the decomposition process can also prevent the spread of the flame. According to foreign experiments, the decomposition rate of crystal water in calcium sulfate dihydrate is about every 6㎜ thickness 15 minutes. Take the solid gypsum block with a thickness of 80㎜ as an example, its decomposition time takes about 4 hours, and the indoor property has not reached the ignition point during this period, which has won valuable time for people to escape, property protection and fire fighting in the fire.
2) Comfort
Comfort means that it has the functions of keeping warm and breathing. Wood is people's favorite indoor building material. Because of its light weight and warmth, it is often used on floors, dados and even wallboard, which makes people feel warm and comfortable. Using natural gypsum to make gypsum building materials, the water-gypsum ratio is generally 0.6? 0.8, the industrial by-product gypsum can reach more than 1.0. After hydration and hardening, a large amount of free water will evaporate, leaving a large number of pores in the product, forming a porous material with a bulk density less than 1.0 and a thermal conductivity of 0.20? 0.28W/m.K, which is close to the average thermal conductivity of wood, and has similar warmth retention as wood.
The respiratory function of gypsum building materials stems from its porosity. These pores can absorb water when the indoor humidity is high; On the contrary, when the indoor humidity is low, the moisture in the pores can be released, and the indoor humidity can be automatically adjusted, making people feel comfortable.
3) It can fully meet people's requirements for various indoor functions.
Gypsum building materials are suitable for indoor ceilings, walls and floors. By choosing different varieties and different structural combinations, it can meet the functional requirements of indoor heat preservation, sound insulation, fire prevention, waterproof and flexible separation, and is also a good indoor decoration material.
4) It can be recycled.
Building gypsum is made of gypsum dihydrate, which becomes gypsum dihydrate after hydration. Waste gypsum building materials can be used as raw materials to produce gypsum building materials after crushing, screening and re-calcination, and no construction waste is produced.
5) Harmless to human health.
Gypsum is not only nontoxic, but also edible and medicinal. The research shows that pure gypsum, as the basic material of medicine in western medicine pharmacopoeia, is a good medicine for clearing fire blindly in Chinese medicine. It is recorded in Shennong Materia Medica Classic and Kaibao Materia Medica that gypsum is pungent, sweet and cold, belonging to lung and stomach meridian, which can nourish yin and clear away heat, relieve annoyance, quench thirst, promote blood circulation and relieve pain, and promote granulation.
6) no environmental pollution
The firing process of building gypsum is to mix calcium sulfate dihydrate (CaSO4? 2H2O) removes three-quarters of the water and becomes calcium sulfate hemihydrate (CaSO4? 0.5H2O), and its "waste gas" is water vapor; The production and application of various gypsum building materials do not discharge waste gas, waste residue, waste water and substances harmful to human body, and do not pollute the environment.
The above situation shows that gypsum building material is not only a kind of building material with very good performance, but also a very comprehensive green building material, which fully conforms to the policy of circular economy and sustainable development.
Gypsum block is not only a very good building material, but also a very comprehensive green building material. Using gypsum block in partition wall engineering will be a good way to reduce construction cost and save construction energy.