The secretary general of the Organization of Petroleum Exporting Countries (OPEC) said recently that US economic sanctions against Venezuela have affected global energy supplies.
He told Venezuelan media that the ECONOMIC sanctions imposed by the United States on Venezuela and other countries have seriously affected the ability to produce and export oil worldwide and violated the right of people in other countries to use energy.
Venezuela has one of the largest proven crude oil reserves in the world, but U.S. sanctions have made it impossible for Venezuela’s oil industry to consistently export reliable energy to the world, he said. Despite this, he highly appreciated the efforts of the Venezuelan oil industry to maintain Foam Concrete are expected to increase in the future.
As a lightweight thermal insulation material, foamed concrete has been widely used in construction projects. Some problems have also occurred during its application. When applied to thermal insulation components, due to the excessive water absorption of the material, the bulk density increases, but the thermal insulation performance decreases. Quality issues. It is extremely disadvantageous to the durability of foamed concrete.
Influencing factors of water absorption of foam concrete
The water absorption rate of foamed concrete is carried out through two conditions: the penetration of capillary pores and the penetration of connected pores. Capillary pores are interconnected capillary pores formed in the initial stage of cement hardening. One of the reasons for the formation of connected pores is that during the setting process of foam concrete, the liquid film produces uneven diffusion under the dual action of gravity, surface expansion force, and slurry extrusion, resulting in defects in closed foam pores and condensation. After the performance of incomplete pores; another reason is the passage of bleeding caused by bleeding in the case of large water-cement ratio of foam concrete.
The problem of bulk density
The influence of the water absorption of foam concrete on the thermal insulation performance of the material can be measured by the volume water absorption. As the water increases, the bulk density increases, the cell radius becomes smaller, the cell wall becomes thicker, the number of connected pores decreases, and the moisture permeability per unit volume also decreases. That is to say, the change in water absorption caused by the change in the content per unit volume and the resulting change in permeability cancel each other out. Therefore, the volume water absorption rate of foamed concrete with different bulk weights does not change significantly. At the same time, some experimental data also show that the water absorption rate also shows a similar change trend when using other strength grades of cement to make foam concrete.
Quality problems of foam
When the foaming machine is stable and normal, the foam quality mainly depends on the performance of the foaming agent, and its influence on the mass water absorption is mainly measured from three aspects: the pore size, the uniformity of the pore size of the foam and the stabilization time of the bubbles. In fact, the smaller the pore size, the smaller the pore volume. At the same time, the denser the number of layers of the pore walls in the volume, the lower the probability of forming connected pores.
The hydration age of cement
The difference in water absorption of foamed concrete made of different varieties and strength grades of cement at the same bulk density is mainly determined by its hydration age. Under normal circumstances, the foamed concrete of cement products with a short hydration and hardening age The water absorption rate is low.
Auxiliary admixture problem
The industrial wastes such as fly ash or slag with different dosages of general additives in foamed concrete are most commonly mixed with fly ash in practical applications.
Control of foaming quality
At present, the foaming method at home and abroad is to use high-pressure foaming. By applying pressure at the same time, the mixing speed of gas and liquid is accelerated, so that the bubbles are fine and uniform. The foaming machine has a great influence on the quality of the foam, which is mainly controlled by the ratio of air intake and liquid intake.
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Chile's government has decided to create a state-owned lithium enterprise and hopes to establish a model for the company by the end of the year, Mining Minister Marcela Hernando said in an interview.
Chile is the world's second largest lithium producer and has the largest reserves of lithium in the world. The domestic lithium industry is currently dominated by two private companies, Albemarle and SQM.
Chile wants to participate more closely in the booming lithium market after leftist President Gabriel Boric took office in March. The accelerating electrification of the global auto industry has helped push prices of lithium, a key raw material for electric car batteries, to record highs over the past year, lapping up more players, including Mexico and Argentina, who want a piece of the market.
According to Hernando, the government is setting up a task force to determine the best way to run state-owned lithium enterprises. She said the government hopes to establish plans by the end of the year for how the company will develop and what business model it will operate under.
Hernando stressed that while the state would be a major shareholder in the proposed company, it was open to private investment.
Luoyang Tongrun Nano Technology (TRUNNANO) is a global chemical material supplier providing high-quality chemicals and Nanomaterials including graphite powder, 3D printing powder, the Foam Concrete.
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