Iron tailing micro-powder mortar dry powder for building mortar and preparation method thereof

Abstract

The invention relates to iron tailing micro-powder mortar dry powder for building mortar. The iron tailing micro-powder mortar dry powder is obtained by mixing the following raw materials and carryingout two-time homogenization. The raw materials comprise, by weight, 70%-85% of iron tailing micro-powder, 15%-30% of P.O 42.5R cement, and 0.1%-0.15% of an active activator. The fineness of the irontailing micro-powder is that the screen residue of a 45 [mu]m square hole screen is not greater than 5%, and the specific surface area is greater than 500m <2>/kg. The cement is at least one of ordinary Portland cement, aluminate cement and sulphoaluminate cement with the label of 42.5R. The fineness of the cement is that the screen residue of a 45 [mu]m square hole screen is not greater than 3%.The specific surface area is greater than 360 m<2>/kg. The active excitant is a mixture of triethanolamine and potassium sulfate. According to the invention, the problem that the cost of the cementingmaterial for the building mortar needs to be further reduced is solved, and the technical problems of low early strength, low breaking strength, high mortar breaking ratio and poor crack resistance when the fly ash cementing material is used for the building mortar are solved. The industrial solid waste iron tailing micro powder can be comprehensively utilized, so that the environmental pollutionis reduced. Because the waste utilization amount is large, cement and lime are saved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a dry iron tailings powder mortar powder for building mortar and a preparation method thereof. Background technique [0002] Construction mortar is widely used in masonry, plastering, repairing, grouting and pasting facing materials, etc. %-40% cement is used to prepare construction mortar. Due to the low strength grade of most construction mortars, there are very few low-strength grade cements for the preparation of mortars. In actual engineering, only higher-strength grade cements such as 32.5 or 42.5 grades are often used to prepare low-strength grade mortars. In order to improve the consistency It is convenient for construction, so cement has to be added in excess, resulting in waste of cement. [0003] In the traditional technology, when fly ash is used as raw material to produce cementitious materials, the amount of fly ash is usually below 35%, and when the am...

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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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