Non-cement green mortar by using steel slag as cementing material and fine aggregate and preparation method thereof

Abstract

The invention belongs to the field of building materials and particularly relates to a non-cement green mortar by using the steel slag as the cementing material and the fine aggregate and a preparation method thereof. The non-cement green mortar comprises the following components in weight part: 30-50 parts of steel slag powders, 50-70 parts of mineral powders, 200-350 parts of steel slag sands, 4-7 parts of activator, 1-4 parts of a water reducing agent, 3-6 parts of a dispersing agent, 0-0.4 parts of a retarder, 0.0002-0.001 part of a defoamer, and 30-40 parts of water. The non-cement green mortar is good in working performance, automatic in leveling effect, adjustable in setting time with the range of 0.5-8 hours, high in early-late strength, and excellent in impermeability and resistance to sulfate attack. The 7d breaking strength of the non-cement green mortar is larger than 8 MPa, and the compression strength thereof is larger than 40 MPa. The 28d breaking strength of the non-cement green mortar is larger than 9 MPa, and the compression strength thereof is larger than 50 MPa. Therefore, the non-cement green mortar can be widely applied to the engineering practice.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a cement-free green mortar using steel slag as cementitious material and fine aggregate and a preparation method thereof. Background technique [0002] As early as the end of the 20th century, my country's steel output has leapt to the first place in the world. Steel slag is the slag containing calcium oxide, magnesium oxide, iron oxide, silicon oxide, aluminum oxide, manganese oxide and other substances that are finally discharged in order to adjust the composition of molten steel in steelmaking. molten slag. The steel slag produced over the years is about 10%-12% of steel output. According to statistics, my country's steel slag discharge exceeded 100 million tons in 2013, and the storage volume of steel slag is large, which not only occupies increasingly tense land, but also poses potential hazards to the surrounding environment. The main composition of steel slag...

AI Technical Summary

Problems solved by technology

However, steel slag itself has low activity, poor grindability, and poor volume stability, which greatly limits the large-scale and high value-added application of steel slag in the building materials industry.

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