Fly ash cementing material

Abstract

The invention relates to the field of building materials, in particular to a fly ash cementing material. The fly ash cementing material comprises the following raw materials in parts by mass: 50-60 parts of pulverized coal furnace fly ash, 25-35 parts of slag, 5-10 parts of gypsum, 5-10 parts of steel slag, 1-5 parts of a chemical exciting agent, 0.1-0.5 part of an alkaline water agent and 0.1-0.5 part of a defoaming agent, wherein the chemical exciting agent comprises the following components in percentage by mass: 80-90% of aluminum sulfate, 1-5% of calcium aluminate and 5-15% of sodium hydroxide. According to the fly ash cementing material, the early strength of a product is improved through multiple excitation of alkali excitation, sulfate excitation, calcium aluminate excitation and mechanical excitation, the problems of fly ash treatment and utilization are fully solved, the use amount of fly ash exceeds 50%, waste such as slag and steel slag is subjected to resource utilization, and the cost is reduced. And the method is beneficial to treatment of environmental pollution and has very high social benefits and economic benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a fly ash cementitious material. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. The main oxide composition of fly ash in thermal power plants in my country is: SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , CaO, TiO 2 Wait. With the development of the power industry, the discharge of fly ash from coal-fired power plants has increased year by year, becoming one of the largest industrial wastes in my country. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; if it is discharged into the water system, it will cause river silting, and the toxic chemicals in it will also cause harm to human beings and organisms. However, fly ash can be used as a resource, such as the preparation of cementitious materials. [0003] ...

AI Technical Summary

Problems solved by technology

Although the fly ash itself has a certain activity, its stimulating effect on it in the early stage is limited, resulting in low strength in the early stage

The publication number is CN108706893A Chinese patent discloses a cementitious material made of fly ash, which mentions the early strength characteristics of the cementitious material, but does not specify the strength of one day; and the amount of flyash used in the patent is 10-30% , lower dosage

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