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Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and c…
According to incomplete statistics, the prices of nearly one hundred chemical raw materials have increased compared with the same period last year. The top three in terms of gains were bisphenol A (258.77%), acetic acid (219.67%), and butanediol (214…
Concrete is the main raw material of modern construction engineering, and it is welcomed because of its high strength and long service life.…
Risk aversion plunged on the positive news of the Russia-Ukraine talks. After several days of rising oil prices, the price of precious metals continued to fall. Domestic futures markets remain stable for the time being.Back in international markets,…
Concrete retarder is a kind of additive which can delay the hydration reaction time of cement, so as to delay the setting time of cement.…