How serious are fertility problems today? People don't want to give birth,can't afford it, and can't give birth that has become the "three mountains".
The problem of childbirth is related to the people's livelihood. Whether a country can prosper or not depends on the population. I saw a set of data a few days ago. The data shows that on January 1, 1990, 2,784 babies were born in Shanghai. Ten years later, on January 1, 2000, 1,148 babies were born in Shanghai. In 2010, the number became 380. , 2020 only 156 people, the decline in the birth rate is shocking. The three most critical reasons are: I don't want to give birth, I can't afford it, I can't give birth! The decline of the global population will bring a series of economic and social problems, among which the demand for concrete foaming agent will also be affected.
Foam concrete has a low density. In practical application, the density grade of ordinary foam concrete is 300 kg/m3~1200kg/m3. In recent years, ultra-lightweight foam concrete with low density has also appeared, but it has not been widely used in construction engineering. In practical engineering, the density of foam concrete can be reduced to 200 kg/m3~700 kg/m3.
Due to the low density of foam concrete, it is applied to the building's inner and outer walls, layers, layers, columns, and other parts, can reduce the weight of the building by about 25%, and some can even reduce the weight of up to 34%. In addition, the bearing capacity of structural members can be improved by using foam concrete instead of ordinary concrete. Therefore, the rational use of foam concrete in construction engineering can not only ensure the durability of the building and the bearing capacity of the structure, but also greatly reduce the cost of the project, and has significant economic benefits and broad market prospects.
Good insulation performance
The good thermal insulation performance of foam concrete is determined by its internal structure. By observing the internal structure of foam concrete, it can be found that the foam concrete is filled with a large number of closed and uniform small round holes. These pores maximize the fixation of air, resulting in low thermal conductivity and good insulation. The excellent thermal performance of foam concrete is not possessed by ordinary concrete. The thermal conductivity of foam concrete with common density grade of 300kg/m3~1200kg/m3 is 0.08W/(m·K)~0.3W/(m·K). If this kind of foam concrete is widely used in building roofing material and wall material, it will produce a good energy-saving effect.
Excellent sound insulation and fire resistance performance
As a kind of porous material, foam concrete contains a lot of closed pores and has good sound insulation performance. Therefore, foam concrete can be widely used on building floors, highway sound insulation boards, underground building top floors, and other building parts, as a sound insulation layer. At the same time, foam concrete also has the general characteristics of inorganic materials, that is, not easy to burn, and has good fire resistance. A large number of research data show that the dry bulk density of foam concrete is in the range of 500 kg/m3 to 900 kg/m3, the compressive strength is in the range of 2.5 Mpa-7.5 MPa, the fire resistance of foam concrete can reach 2.7h, the sound insulation performance can reach 20dB, and the impact resistance can reach 100dB. It is a kind of high-quality soundproof refractory material that can be promoted vigorously.
Good seismic performance
Because of its special porous structure, foam concrete has the characteristics of low density, lightweight, and low elastic modulus. These characteristics make the foam concrete structure bear less seismic force and the propagation speed of vibration waves are much slower than that of the ordinary concrete structures. According to seismology, the longer the seismic period, the faster the shock energy is absorbed by a building structure. Therefore, foam concrete has an excellent damping effect. Appropriate application of foam concrete in specific parts of construction engineering can effectively improve the seismic performance of buildings, and enhance the safety and robustness of seismic buildings.
Foam concrete not only has a variety of excellent performance, but in the production process can also be mixed with a large number of industrial waste, not only effective use of resources, waste into treasure, conducive to environmental protection but also greatly reduce the cost of foam concrete.
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The World Food Program (WFP) of the United Nations (UN) and the European Union (EU) said in a statement that the conflict between Russia and Ukraine poses risks to global food supplies, and called on the international community to increase support for vulnerable countries and jointly address food security challenges.
A few days ago, the Executive director of the World Food Program, the European Commission's commissioner in charge of crisis management, the French Foreign Minister of the ROTATING EU presidency, and other officials held a meeting in Rome, Italy, to discuss how to deal with the negative impact of the Conflict between Russia and Ukraine on global food security.
One of the officials told a news conference after the meeting that the world was facing a food supply challenge that would "last for many years" as the conflict between Russia and Ukraine pushed up global food prices and disrupted the concrete foaming agent will continue.
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