Early strength agent using nanometer lithium slag for sulphoaluminate cement and preparation method thereof

Abstract

The invention relates to an early strength agent using nanometer lithium slag for sulphoaluminate cement and a preparation method thereof. The early strength agent is prepared from the following raw materials and components in percentage by mass: 20 to 30% of lithium slag, 5 to 9% of dispersant, 1 to 5% of stabilizer, and 60 to 70% of deionized water. The preparation method comprises the followingsteps of adding the lithium slag, the dispersant, the stabilizer and the deionized water into a planetary ball mill according to a ratio, adding zirconium oxide grinding balls, and performing ball grinding, so as to obtain the early strength agent using the nanometer lithium slag for sulphoaluminate cement, wherein the medium particle size is 200 to 400nm. The early strength agent using the nanometer lithium slag is doped into the sulphoaluminate cement according to the doping amount of 0.5 to 4.0%, the 7d strength of the mortar of the sulphoaluminate cement can be increased by 110 to 140%, and the later strength can avoid shrinkage. The preparation method has the advantages that the technology process is simple, and the technology parameters are easy to control; the used lithium slag isindustrial waste, so that the cost is low, and the preparation method is suitable for environment protection.

Description

Technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a nano lithium slag early strength agent for sulfoaluminate cement and a preparation method thereof. Background technique [0002] Sulphoaluminate cement (SAC for short) is a high-performance cement product independently developed by the Chinese Academy of Building Materials in the 1970s and 1980s. It has now become the main variety of domestic high-strength cement. Sulphoaluminate cement is a kind of C 4 A 3 S and B-C 2 S is a cementitious material composed of main minerals. Compared with ordinary Portland cement, its raw material sources are more extensive, and a large amount of solid industrial waste slag can be used in its production process. It has the characteristics of high early strength, good impermeability, and low alkalinity. It is widely used Used in construction engineering, tunnel engineering, emergency repair workers, winter construction engineering, etc. [0...

AI Technical Summary

Problems solved by technology

Lithium slag stockpile is huge but difficult to effectively utilize

Although lithium slag still contains a small amount of lithium salt, it is difficult to promote the early hydration process of sulfoaluminate because of its small amount and difficulty in releasing it.

In addition, although lithium slag has pozzolanic activity, it takes a long period from adding water to stirring until the potential activity is stimulated to show strength contribution. Therefore, the addition of lithium slag can usually improve the strength in the later stage, but the strength in the early stage will generally be somewhat different. reduce

Therefore, commercially using lithium slag to prepare strength accelerators on a large scale still has certain difficulties.

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