The US President recently said the conflict between Russia and Ukraine had driven up the prices of all the world's major food staples, including wheat, corn, barley, oilseeds and edible oils, and that Russia and Ukraine together supplied more than 25% of the world's wheat exports and about 20% of its barley exports.
To address the food shortage, the Biden administration says it plans to increase the number of counties eligible for insurance for double cropping. Double cropping is when farmers grow two different crops a year on the same field.
Under Biden's plan, the number of counties eligible for two-season crop insurance would increase by 681, for a total of 1,935.
The UN has warned that up to 1.7bn people are "highly exposed" to the domino effect of the conflict between Russia and Ukraine on the global food, energy, and financial systems. The agency says conflict could increase hunger in countries where people are already suffering from malnutrition.
Even countries where food is less scarce are being hit by rising prices. U.S. grocery prices rose 1% in April, compared with a 10.8% increase over the past 12 months, the Labor Department said recently.
According to the White House, global food prices have risen nearly 13 percent since the outbreak of the Russia-Ukraine conflict.
Besides, affected by the ever-changing international situation, the supply and prices of international bulk polycarboxylate superplasticizer ,polycarboxylic acid superplasticizer,pce based superplasticizer are still very uncertain.
Superplasticizer admixture for concrete is one of the most used concrete admixtures, which can increase the plasticity of concrete and change the strength of concrete. But do you know how it can change the strength of concrete?
1. The essence of polycarboxylic acid superplasticizer: increase the fluidity of concrete
We know that water in concrete can provide plasticity for concrete. At this time, adding polycarboxylic acid superplasticizer can increase the fluidity of concrete, that is, increase the plasticity.
But it needs to be clear that if there is no water in the concrete, no matter how much water reducing agent is added, the surface of the concrete raw material will not be wetted no matter how it is mixed, so the friction between particles will still be high, and the concrete is a mess of loose sand. , is completely non-plastic.
On this basis, it can be considered that, in essence, a sufficient amount of water can wet the surface of concrete raw materials and reduce the friction between particles, thereby providing plastic properties for concrete; after the addition of superplasticizer polycarboxylate, this effect of water can be amplified. In this In a sense, adding water reducing agent is equivalent to adding water.
2. The principle of polycarboxylic acid superplasticizer to change the strength of concrete
The pce based superplasticizer can amplify the effect of concrete water, so that it can replace part of the concrete water and reduce water.
We know that the strength of concrete is affected by the water-binder ratio. The larger the water-binder ratio, the lower the strength, and the smaller the water-binder ratio, the higher the strength. If we add a water reducing agent to the concrete and reduce the water consumption at the same time to keep the fluidity unchanged, the water-binder ratio will decrease under the condition that the amount of cementitious material remains unchanged, thus increasing the strength of the concrete; Under the circumstance of reducing the amount of cementitious material at the same time, keeping the water-binder ratio and fluidity unchanged, the cementing material can be saved.
This method of using the pce based superplasticizer makes use of the properties of the pce based superplasticizer to change the mix ratio of the concrete, thereby increasing the strength of the concrete or saving cementitious materials.
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Researchers at the Centre for Translational Atomic Materials at Swinburne University of Technology, Melbourne, Australia have developed a new graphene film that absorbs more than 90% of sunlight while eliminating most of the infrared thermal emission losses, a highly efficient A solar-heated metamaterial capable of rapidly heating to 83 degrees Celsius (181 degrees Fahrenheit) in an open environment with minimal heat loss. Proposed applications for the film include thermal energy harvesting and storage, solar thermal power generation, and seawater desalination.
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