High-performance chlorine-free alkali-free liquid accelerating agent

Abstract

The invention discloses a high-performance chlorine-free alkali-free liquid accelerating agent which is prepared from the following materials by weight percent: 6 to 15 percent of magnesium aluminum fluoride, 20 to 50 percent of aluminum sulfate, 2 to 6 percent of organic amines, 0 to 2 percent of stabilizer, and the balance of water. The production process comprises the following steps of: adding water at the given weight percent to a stirring drum, adding magnesium aluminum fluoride and stirring to dissolve, adding organic amines and stirring to dissolve, adding aluminum sulfate and stirring to dissolve, and making the final product. The high-performance chlorine-free alkali-free liquid accelerating agent is free of chlorine and alkali and non-corrosive to human beings and steel-bar-made machines, and has the advantages of long holding period, low addition amount, quick setting action, low rebound rate, high one-day strength, substantially no loss of long-term strength and good material compatibility. The production process is simple, pollution-free and noise-free, does not produce gas discharge or waste water, and is safe and environment-friendly. The materials are abundant, the production cost is low, and the social and economic benefits are extremely good.

Description

technical field [0001] The invention relates to a concrete accelerator, in particular to a chlorine-free and alkali-free liquid accelerator, which belongs to the technical field of building materials. Background technique [0002] Accelerator is a chemical admixture that makes cement set quickly, and can make cement set and harden in a short time. It is mainly used in shotcrete and shotcrete projects. Shotcrete has many advantages in construction and rock support, and has become a very important and necessary measure in modern underground engineering, especially the development of wet-mix shotcrete technology, which greatly expands the use of shotcrete in underground engineering scope. The main function of the liquid quick-setting agent for shotcrete is to accelerate the setting of the concrete mixture and improve the early strength, which can increase the thickness of the sprayed layer and shorten the time for spraying the next layer. With economic development and technol...

AI Technical Summary

Problems solved by technology

Now there are some products that claim to be non-alkali accelerators, which are basically neutralized by acid and alkali. The strong alkali products with a pH value above 13 are neutralized with acid to a pH value of about 7. The one-day strength and 28-day strength of the agent are low, and it is also extremely corrosive

There are also some products called alkali-free accelerators prepared by compounding methods such as aluminum salts, sodium salts, and lithium salts. This accelerator has the following defects: 1. Poor compatibility of materials; 2. Short shelf life Generally, it will agglomerate in 3-5 days; 3. The amount of mixing is large, often 10%; 4. The production cost is high, which can reach about 5,000 yuan per ton

Images