Combine Polycarboxylate Superplasticizer with Early-strength Component
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Following the progress in Russia-Ukraine peace talks, the gold price fell more than 1% the next day, hitting its lowest in a month, and palladium prices briefly tumbled by nearly 9%.
"We have seen metal prices going into free fall when the Russia-Ukraine situation is likely to see a major detente, which spurred people's risk preference and optimism that the war could end at a time," said OANDA senior market analyst.
A Russian deputy defense minister says Moscow has decided to sharply curtail its military activities around Kyiv and Chernikov in Ukraine, following talks between Russian and Ukrainian representatives in Istanbul.
Where the prices of metals, natural gas, and commodities like the pce powder will go in the future, is still very uncertain.
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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Since the beginning of this year, China's macro policies have made continuous efforts to stabilize economic growth. America and Europe are raising interest rates to control inflation. On March the European Central Bank left its three key interest rates unchanged and began to scale back its asset-purchase programme. Then the Federal Reserve raised the target range of the federal funds rate by 25 basis points to 0.25%-0.5%. The accelerated tightening of monetary policies in the US and Europe pushed capital back to the US and increased interest rates, which will definitely increase the risk of RMB depreciation and capital outflow. The price and market of the pce powder will also be affected, resulting in a range of fluctuations. You are welcome to contact us for the latest quotation of pce powder.