A compound wet-grinding concrete waste slag functional additive and its application

Abstract

The invention discloses a compound type wet-grinding concrete waste slag functional additive and its application. The components and mass parts are: 140-160 parts of grinding aid component, 140-160 parts of dispersing component, and retarding component 60-80 parts, early strength component 10-20 parts, water 160-180 parts. This functional additive is specially designed for concrete waste residue. It has multiple functions such as grinding aid, dispersion, slump retention (retarding) and early strength. It is liquid at room temperature, low in dosage and environmentally friendly. When used for wet grinding of concrete waste, it can effectively improve the efficiency of wet grinding. The obtained waste slurry is uniformly dispersed and stable with extremely high particle fineness. It has high activity and is easy to store and transport. Effectively improve the early strength and work performance of concrete, and have high engineering application value.

Description

Technical field [0001] The present invention belongs to the field of functional building materials, which specifically relates to a compound type wet-grinding concrete waste residue function aid and its application thereof. Background technique [0002] During the solid waste treatment, the treatment and reactivation of the drying grinding is generally used, and the conventional mechanical powder mill is defective, and the higher surface energy such as high energy consumption, low efficiency, and the higher surface energy in the dry polishing process can lead to granules. Further, the powder mill limit is only 6 to 8 um, which limits its blending effect. Compared to conventional mechanical powder milling, the mixing and wet milling can not need to dry the moisture in the industrial waste, and the moisture in the waste slag can also function, reduce the surface of the reference material to improve the wet milling efficiency. Considering economic energy saving and particle effects,...

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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