In terms of international pricing benchmarks, according to the CP data released by Saudi Aramco, the propane contract price (CP) in March was $895 / ton, up $120 / ton from the previous month, up 15.48% from the previous month and up 43.20% from the same period last year. Butane contract price (CP) in March was 920 US dollars/ton, up 145 US dollars/ton compared with last month, up 18.71% month-on-month, up 54.62% compared with the same period last year; In March, CP in Saudi Arabia rose sharply, giving a strong boost to the international and domestic LPG market. Benchmark LPG prices are higher than a year ago as the economy continues to recover and demand for crude oil continues to repair. According to this trend, the market price of pce powder will also be affected to a certain extent.
In order to overcome the technical defects in the application of polycarboxylate water-reducing agent, or to improve some or some properties of concrete (workability, slump retention, reduction of bleeding, improvement of early strength, low shrinkage, etc.), it is necessary to modify the concrete.
In practice, the commonly used modification methods include synthetic technology and compound technology. Compared with the synthetic process, the compound method has the advantages of simple operation and low cost, so it is widely used in practical applications. Polycarboxylate series compound technology, is the Polycarboxylate series water-reducing agent and other components (such as slow coagulation, defoaming, air induction, early strength, and other components) according to a certain proportion of the combination compound, in order to achieve the coordination of the superposition of each component.
Compound Polycarboxylate Superplasticizer with Early-strength Component
With the wide application of polycarboxylate superplasticizer, the requirement of concrete early strength in practical engineering is more and more prominent, so the polycarboxylate superplasticizer has been the focus of research to meet the early strength performance of concrete. Early strength polycarboxylate water reducing agent can be made by compounding early strength agent and polycarboxylate water reducing agent. Commonly used early strength agent mainly includes strong electrolyte inorganic salt early strength agent (sulfate, sulfate double salt, nitrate, nitrite, chlorine salt, etc.) and water-soluble organic compound (triethanolamine, formate, acetate, etc.) and its complex.
Through the study of MPEG Polycarboxylate superplasticizer and five kinds of early strength agent, it is found that the compatibility between sodium sulfate early strength agent and polycarboxylate superplasticizer is very poor and the early strength of cement decreases. The combination of calcium nitrate, sodium nitrite, triethanolamine and triisopropanolamine with polycarboxylate significantly decreased the fluidity retention ability of net slurry, but all of them could improve the early strength of cement, but the effect was slightly different due to the type of early strength agent, among which triethanolamine had the most obvious enhancing effect. Zhao also found through the compound study of polycarboxylate water-reducing agent and early strength agent that the compound performance of NaCl, CaCl2, NaNO2, NaNO3 and other early strength agents and polycarboxylate was good. After adding a certain amount of early strength agent, the compound system had almost no adverse effect on the fluidity and plastic energy of fresh concrete, but all of them could significantly improve the strength of concrete at each age. The mixture of Na2SO4 and Na2S2O3 reduces the fluidity and plasticity of concrete, but it also has a significant strengthening effect on concrete.
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Europe's immediate goal of reducing its dependence on Russian gas in response to the conflict with Ukraine presents a rare opportunity for the United States, the world's largest gas producer. America's LNG exporters have made a fortune this time. Investors are bullish on the future of natural gas, as evidenced by the recent record high share price of Energy company Chenier.
But the outlook for more than a dozen new LNG projects is highly uncertain as construction costs rise, US gas prices soar and climate policymakers seek to move away from a long-term reliance on fossil fuels. Even the most advanced projects can take years to become operational.
Currently, the total U.S. LNG pce powder are expected to continue to rise in the future.
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