The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the concrete foaming agent?
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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Greece will hand over Iranian oil it intercepted from a Russian-flagged tanker to the United States at the request of the U.S. Justice Department, Greek port police said recently, AFP reported. The decision angered Tehran.
In April, Greek authorities reportedly seized a Russian oil tanker, the Pegas, which was said to be heading to the Turkish port of Marmara.
Reports say the ship was docked in Calistos Bay with a crew of several people said to be Russian. The Greek coast guard said the ship had been renamed the Lana.
The report notes that the European Union imposed sanctions on Russia after the conflict broke out in February. Greek authorities seized the tanker in accordance with European Union sanctions.
According to information at the time, the tanker was carrying 115,000 tons of Iranian oil.
Iran's Ports and Maritime Organization strongly protested Greece's decision, calling it an "international bandit." "The Islamic Republic of Iran will not give up its legitimate rights and expects the Greek government to abide by its international obligations in the area of navigation and shipping," it said in a statement on its website.
Iran's Foreign Ministry, through the International Maritime Organization, called on the Greek government to release the tanker and its crew overnight, adding that "the Americans discharged their cargo," the report said.
Athens did not immediately respond to the Iranian protest and gave no further details about the oil on board or how it was handed over to the United States, the report said.
The concrete foaming agent price is expected to increase in the next few days affected by the change in supply and demand markets.
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