Composite mineral admixture for concrete

Abstract

The invention discloses a composite mineral admixture for concrete. The admixture is prepared by mixing and grinding the following raw materials in percentage by weight: 40 to 60% of lithium slag, 10 to 30% of mineral slag, 5 to 20% of nickel slag, 5 to 10% of aerated concrete waste, 5 to 10% of sulfoaluminate cement clinker, and 0.1 to 0.5% of super plasticizer powder. The industrial wastes are fully utilized, the concrete production cost is reduced, and the admixture has a high activity, barely influences the early and late strength of concrete, has a shrinkage-compensating function and good anti-permeability property, and can improve the service life of concrete.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a composite mineral admixture for concrete. Background technique [0002] At present, the energy consumption of cement production is high, and one ton of cement produces about one ton of carbon dioxide greenhouse gas. In order to change this situation, various metallurgical slag (slag, steel slag), fly ash, limestone powder, rice husk ash, waste glass powder, etc. etc. have been used as admixtures in cement production, or as mineral admixtures in concrete production to reduce the energy consumption of cement production, improve the environment, and improve the durability of cement concrete. However, these mineral admixtures tend to lead to prolongation of cement setting time, early or late strength reduction and other phenomena during use. [0003] At present, there are many documents on the production of mineral admixtures using industrial metallurgical slag. In order to impro...

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Problems solved by technology

[0004] 1) Patent 201210211517.6 A high-activity slag powder and its preparation method, patent 201210537602.1 large-volume steel slag foam concrete block and its preparation method, patent 200810151897.2 ultra-fine fly ash-based composite mineral admixture and its preparation method, literature "Super Performance of fine fly ash" (Acta Silicate, 2003) through ultra-fine grinding of slag, steel slag, fly ash, etc. to increase the fineness of mineral admixtures to improve their activity, however, ultra-fine grinding will bring greater Energy consumption, and problems such as agglomeration are likely to occur when the powder is too fine;

[0005] 2) Patent 200910131851.9 an admixture for high early strength concrete, patent 201510270200.3 a composite admixture for high-strength concrete and its preparation method, patent 201210240692.8 a composite admixture for concrete, etc. through alkali metal ion salt, alkali Alcohol amine activators etc. excite mineral admixtures to improve the activity of mineral admixtures. However, alkali excitation often increases the early strength, while the later strength is often lower; and the national standard sets the alkali content introduced by the concrete admixture The limit is that the content of foreign alkali is not more than 3kg / m 3 , the alkali content is less, the effect is not good, when the alkali content is more, there is a risk of alkali aggregate reaction

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