my country's concrete winter construction technology has developed rapidly since the founding of the People's Republic of China. Especially in recent years, with the expansion of the scale of capital construction and the rapid development of the construction industry, it has A series of construction methods suitable for my country's national conditions have been formed. In terms of antifreeze, from the early days of the founding of the People's Republic of China, only chlorine salt early-strength agents and antifreeze were used. Today, there are hundreds of products, and they are developing in the direction of composite multi-functions. The basic formula composition is: water reduction + It is composed of early strength + antifreeze + air entrainment.
Abroad, Russia is the earliest country to adopt antifreeze and has the largest application volume. The current development path is: inorganic salt, inorganic salt + plasticizer (or plasticizer) Chemical air-entraining agent), multifunctional antifreeze based on organic compounds. Multifunctional antifreeze emphasizes the use of chlorine-free salts, low-alkali or alkali-free metal salts. Various types of antifreeze such as HC and CHC have been launched successively and used in winter construction. Japan used to rarely use antifreeze. In recent years, it has researched and introduced a compound antifreeze containing polyethylene glycol ester derivatives and nitrates. my country's national standard for admixtures GB8076-1997 stipulates that admixture manufacturers must provide admixtures. Data on the total alkali content in the agent "Technical Specifications for the Application of Concrete Admixtures" GBJ119 also stipulates that the amount of alkali brought into the concrete by the admixture shall not exceed 1kg per cubic meter of concrete. It seems that we are vigorously developing low-alkali and alkali-free antifreeze agents. It is an inevitable trend in the future.
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