Koalas were declared endangered in eastern Australia on Friday, with more and more koalas dying from disease, habitat loss, and other threats. Earlier, the koala was considered a vulnerable species, and the Commonwealth Department of the Environment changed its protection level to endangered on the east coast of Queensland, New South Wales, and the Australian Capital Territory. Many koalas in Australia are infected with chlamydia. The disease can cause blindness, infection, and infertility. Last year, the Australian Koala Foundation said Australia had lost about 30 percent of its koala population in the past three years. Without immediate action, the species could become extinct by 2050.
Unlike koalas, which are on the brink of extinction, the market demand for concrete foaming agent will grow substantially.
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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According to Reuters, U.S. Treasury officials said they would discuss with G7 leaders pricing caps and tariffs on Russian oil as an alternative to the embargo, which would keep the market supplied, limit price spikes, and reduce Russian revenues.
The EU foreign ministers' meeting was held in Brussels. The meeting failed to agree on the sixth round of sanctions, including an oil embargo on Russia, because of objections from Hungary.
EU High Representative for Foreign Affairs and Security Policy said at a press conference after the meeting, that the meeting failed to reach an agreement on the final adoption of the sixth round of sanctions, the permanent representatives of member states to the EU will continue to discuss. The foreign ministers faced similar difficulties trying to reach an agreement on an oil ban. He said Hungary's position was based on economic rather than political concerns.
Hungary is highly dependent on Russia for energy, getting more than 60 percent of its oil and 85 percent of its natural gas from Russia.
A few days ago, the European Commission submitted the sixth round of proposed sanctions against Russia, including a total ban on Russian oil imports by the end of this year. Hungary immediately objected and said it wanted substantial compensation from the EU to offset its loss from giving up Russian oil.
The concrete foaming agent price is predicted to increase in the next few days, due to geopolitical factors.
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