Method for improving quality of fly ash concrete blending material

Abstract

The invention provides a method for improving the quality of a fly ash concrete admixture. 50 to 97 percent of undisturbed fly ash, 1 to 30 percent of blast furnace slag, 1 to 30 percent of tailings of magnet quartzite type iron ore or quartzite tailings or marble tailings or granite tailings or stone powder scrapped during stone processing, 0.1 to 1 percent of melamine formaldehyde resin sodium sulfonate, in weight percentage, are mixed and ground together until the triage of a 0.045mm square-mesh sieve is less than or equal to 12 percent. The off-standard fly ash and III-grade fly ash with a gross amount over 80 percent can be improved into the I-grade fly ash or II-grade fly ash according to the method, the utilization value of inferior fly ash can be raised substantially, and the method has advantages of good economic benefit, enlarging the amount of admixture, saving cement and improving the performance of concrete.

Description

technical field [0001] The invention belongs to the field of building materials and environmental protection engineering and technology, in particular to a method for improving the quality of fly ash concrete admixture. Background technique [0002] In 2007, the total amount of thermal power generation in my country was 2.698 billion kwh, and the discharge of fly ash was 307 million tons, of which about 20% of the fly ash could reach the grade I and II powder used in concrete admixtures stipulated in GB1596-91. The standard of coal ash, the rest of the fly ash is difficult to be used as a concrete admixture and be used in large quantities, resulting in a large amount of fly ash dumped and disposed of, polluting the environment. On the other hand, with the rapid rise of energy prices, the price of cement has also been rising, which has led to a rapid rise in the price of slag superfine powder and Class I fly ash that can be used as high-grade concrete admixtures. Whether it i...

AI Technical Summary

Problems solved by technology

Therefore above-mentioned method all can not directly improve the quality and the product grade of the fly ash as the concrete admixture

For example, in the above-mentioned technologies, there is no mention of particle size, water demand ratio, loss on ignition and SO 3 How to control the content and other aspects, and at the same time make it highly active