Dry powder of iron tailings micropowder mortar for construction mortar and preparation method thereof

Abstract

The invention relates to a dry iron tailings powder mortar powder for building mortar, which is obtained by mixing the following raw materials in the following weight percentages and then homogenizing twice, iron tailings powder: 70%-85%; P.O42.5R cement: 15 %‑30%; active stimulator: 0.1%‑0.15%; fineness of iron tailings fine powder: 45 μm square hole sieve not more than 5%, specific surface area greater than 500m 2 / kg; the cement is at least one of ordinary Portland cement, aluminate cement, and sulphoaluminate cement with the label 42.5R; the fineness of the cement is 45 μm, and the sieve residue is not more than 3%, and the specific surface area is greater than 360m 2 / kg; the active stimulator is a mixture of triethanolamine and potassium sulfate. The invention solves the problem that the cost of the cementitious material used for building mortar needs to be further reduced, and solves the problems of low early strength, low flexural strength and high crushing ratio of the mortar when the fly ash cementitious material is used for building mortar , The technical problem of poor crack resistance. And it can comprehensively utilize the fine powder of industrial solid waste iron tailings and reduce environmental pollution. Due to the large amount of waste utilization, cement and lime are saved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a dry powder of iron tailings micropowder mortar for building mortar and a preparation method thereof. Background technique [0002] Building mortar is widely used in masonry, plastering, repairing, grouting and pasting decorative materials and other projects. It is one of the building materials used in construction projects. At present, the cementing material of building mortar is mainly cement. There are about 25 %-40% of cement is used to formulate building mortar. Due to the low strength grade of most building mortars, there are very few low-strength grade cements for preparing mortar. In practical projects, only cements with higher strength grades such as 32.5 or 42.5 can be used to prepare low-strength grade mortar. In order to improve the consistency It is convenient for construction, but excessive cement has to be added, resulting in waste of cement...

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Problems solved by technology

[0005] In order to solve the technical problems existing in the known technology, the present invention provides a dry powder of iron tailings micropowder mortar for construction mortar and its preparation method, which solves the problem of low fly ash and slag content when the cementitious material is used in construction mortar, and the cost requirement Further reduce the problem, and solve the technical problems of low early strength, low flexural strength, high crushing ratio of mortar and poor crack resistance when fly ash and slag cementitious materials are used in construction mortar

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