3D printing concrete prepared from recycled aggregate and preparation method of 3D printing concrete

Abstract

The invention relates to the field of recycled concrete, and particularly discloses 3D printing concrete prepared from recycled aggregate and a preparation method of the 3D printing concrete. The 3D printing concrete prepared from the recycled aggregate is prepared from 110-140 parts of cement, 70-90 parts of gravel, 150-170 parts of the recycled aggregate, 1-1.5 parts of a water reducing agent, 0.5-1 part of an accelerator, 10-15 parts of an admixture, and 70-80 parts of water, wherein 5-20% by weight of the admixture is coated with a temperature sensitive film. According to the 3D printing concrete prepared from the recycled aggregate and the preparation method thereof, the 3D printing concrete has the advantages of relatively low hydration heat temperature and high concrete strength; and in addition, the preparation method disclosed by the invention has the advantage of reducing the unsmooth possibility of the concrete in the 3D printing process.

Description

technical field [0001] The invention relates to the field of recycled concrete, in particular to a 3D printing concrete prepared by using recycled aggregate and a preparation method thereof. Background technique [0002] At present, 3D printing concrete technology is one of the development directions of concrete. 3D printing concrete technology is a new application technology produced by combining 3D printing technology with technology in the field of commercial concrete. Die and divide to produce three-dimensional information, and then pass the prepared concrete mixture through the extrusion device, according to the set program, through mechanical control, extrude from the nozzle for printing, and finally get the concrete component. [0003] In the related technology, a concrete material and preparation method for 3D printing is disclosed in the Chinese invention application document with the application number 201810913908.X, including cementitious material: 1.0 parts; nat...

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Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that when preparing 3D printed concrete, in order to ensure that the concrete has better mechanical properties, the water-cement is relatively low, but the Low water-cement ratio will generate high heat of hydration, which will easily cause large temperature stress and seriously affect the strength of concrete

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