High-thixotropy 3D printing concrete with long opening time and preparation method thereof

Abstract

The invention discloses high-thixotropy 3D printing concrete with long opening time and a preparation method of the high-thixotropy 3D printing concrete. The high-thixotropy 3D printing concrete is prepared from 300-500 parts of a Portland cement component, 300-750 parts of an inorganic filler component, 0.5-1.5 parts of a fiber component, 0.5-3 parts of an ester group modified polyacrylic acid thickener, 0.5-5 parts of a macromolecular side chain acrylic polymer, 0.5-3 parts of diethylenetriamine pentaacetic acid, 50-100 parts of fulvic acid modified tailing slag powder and 90-150 parts of tap water. The tailing slag powder subjected to grinding and fulvic acid etching modification is high in reaction activity, large in specific surface area and low in harmful metal ion content, the concrete strength can be enhanced, and the concrete is endowed with good thixotropy and water retention. The compatibility of the acrylic polymer with larger side chain molecules, the diethylenetriamine pentaacetic acid and the ester-modified polyacrylic acid thickener is good. The prepared concrete is high in thixotropy and long in opening time, continuous construction of large-scale 3D printing engineering is facilitated, tailing slag is subjected to resource utilization, and the concrete is more environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high thixotropic 3D printing concrete with a long open time and a preparation method thereof. Background technique [0002] Concrete 3D printing construction technology, as an emerging additive manufacturing technology, can automatically manufacture three-dimensional entities layer by layer along a preset digital path, which greatly improves construction efficiency and reduces labor costs. In addition, this technology does not require formwork support when stacking concrete elements, thus simplifying the construction process, reducing construction costs, and greatly improving the degree of freedom of construction. The high degree of automation and intelligence, the ability to easily prepare complex building configurations, and its superior environmental friendliness make it extremely promising and has become one of the current research hotspots. [0003]...

AI Technical Summary

Problems solved by technology

[0004]Our country is rich in mineral reserves, and a large amount of tailings are discharged after the separation of useful minerals. At present, the comprehensive utilization rate of tailings in my country is only 18.9%, and the stacking of tailings takes up a lot of land resources, but also caused serious environmental pollution

Among them, ferronickel slag, manganese tailings slag and lead-zinc tailings slag are mostly complex in composition, low in activity and contain a large amount of metal ions, which is also an important reason restricting their resource utilization

Existing documents and patents mainly use ferronickel slag, manganese tailings, lead-zinc tailings and other mineral admixtures to make alkali-activated cementitious materials, but the alkali-activated cementitious materials often have unstable properties , large shrinkage and other problems, it cannot be used in large-scale production and application, and it needs to be used in conjunction with many raw materials, and the composition and process are complex

Chinese patent CN201610943714.5 provides a 3D printing building material, the 3D printing building material is composed of water slag ultrafine powder, fly ash fine powder, cement ultrafine powder, tailings fine powder, tailings slag, steel slag, water reducer, Made of glass fiber, admixture solution, and water, it can be printed smoothly, but the initial setting time of this material is only 20-30 minutes, and the final setting time is only 39-55 minutes. The opening time is too short, and it is difficult to adapt to the large Batch printing for a long time

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