Compound functional aid for wet grinding of concrete waste residues and application thereof

Abstract

The invention discloses a compound functional aid for wet grinding of concrete waste residues and application thereof. The compound functional aid comprises the following components in parts by mass:140-160 parts of a grinding aiding component, 140-160 parts of a dispersing component, 60-80 parts of a retarding component, 10-20 parts of an early0strength component and 160-180 parts of water. Thefunctional additive is specially designed for concrete waste residues, has multiple functions including a grinding aiding function, a dispersing function, a slump retaining (retarding) function, an early-strength promoting function and the like, and is in a liquid state at normal temperature, low in mixing amount and friendly to environment. When the compound functional aid is used for wet grinding of concrete waste residues, wet grinding efficiency can be effectively improved, obtained waste residue slurry is uniformly and stably dispersed, has extremely high particle fineness and extremely high activity and is easy to store and convey, the early strength and the working performance of concrete can be effectively improved after the waste residue slurry replaces admixtures used for concrete production, and high engineering application value is obtained.

Description

technical field [0001] The invention belongs to the field of functional additives for functional building materials, and in particular relates to a compound type wet-milled concrete waste residue functional additive and its application. Background technique [0002] In the process of solid waste treatment, drying and grinding are generally used for treatment and reactivation, while traditional mechanical grinding has defects such as high energy consumption and low efficiency, and the high surface energy state in the dry grinding process can easily lead to particle agglomeration. As a result, the grinding limit is only 6-8um, which limits the play of its admixture effect. Compared with traditional mechanical grinding, the stirring mill wet grinding method does not need to dry the moisture in the industrial waste residue, and the moisture in the waste residue can also play a role in grinding, reducing the surface energy of the raw material to improve the wet grinding efficienc...

AI Technical Summary

Problems solved by technology

However, in order to improve the activity of the slurry in the wet grinding process, a large number of ultrafine particles produced have a large specific surface area and surface energy. Such unstable particles are easily agglomerated to form secondary particles and settle during processing and use. The activity is also reduced, which seriously affects the subsequent use process

[0003] At present, there are few functional additives for wet grinding of concrete waste, among which more dispersants are used. The main problem of wet grinding dispersants is that the dimensional resistance of inorganic dispersants is not enough to form a stable dispersion structure, while polymer When the molecular weight of the dispersant is too large, the adsorption effect is poor, and the flocculation and agglomeration effect will easily occur, which will increase the viscosity and increase the energy consumption in the wet grinding process

The main anchoring groups of the dispersants in the above patents are quaternary amines, quaternary phosphines, sulfonic acid groups, phosphoric acid groups, and carboxylic acid groups. When the above dispersants are used for wet grinding to disperse other material systems, such as alkaline concrete waste, the anchoring groups Various structures but not very targeted, and the accompanying inorganic salt ions will affect the stretching of the solvent chain and reduce the steric hindrance

In addition, the grinding effect of a single dispersant is limited, and it cannot fully stimulate the activity of the material, nor can it guarantee the adaptability of the dispersed wet-ground slurry in concrete production. The single function limits the improvement of the use value of the wet-ground slurry

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