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Nano recycled concrete, processing technology and application thereof

A technology of recycled concrete and processing technology, which is applied in the direction of additive processing, manufacturing tools, construction, etc., can solve the problems of difficulty in guaranteeing water retention cohesion, mechanical toughness and volume stability, poor use effect, and inability to use, etc., to achieve guarantee Effects of marine durability, good interfacial adhesion, good thixotropy and plasticity

Active Publication Date: 2021-08-27
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The curved surface of the coastal assembly structure is complex, and most of them are thin-walled structures. 3D printing concrete is a layer-by-layer printing mode, so it is difficult to have enough concrete protective layer thickness to protect randomly dispersed steel fibers from marine corrosion; at the same time Common marine anti-corrosion technologies such as anti-corrosion coating on the surface and external cathodic protection are either unusable or ineffective for coastal assembly structures with continuous printing interface layers
[0008] (2) When using conventional 3D printing concrete materials to print coastal assembly structures, it is difficult to ensure sufficient interlayer interface bonding and thixotropy while having good rheology, water retention cohesion, mechanical toughness and volume stability

Method used

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  • Nano recycled concrete, processing technology and application thereof
  • Nano recycled concrete, processing technology and application thereof
  • Nano recycled concrete, processing technology and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] In the present embodiment, a nano-regenerated concrete is provided, and the nano-regenerated concrete includes the following components: compound cement, recycled sand, fly ash (FA), polyvinyl alcohol (PVA), graphene oxide (GO) , steel fiber, organic fiber, water reducer, coagulation regulator, mineral admixture and water; the mass ratio of the above components is 1:1:0.05:0.005:0.0002:0.01:0.005:(0.005-0.01): 0.005:0.01:0.3.

[0069] Among them, the compound cement includes the following components: high belite sulfoaluminate cement (HBSC), Portland cement, gypsum, the mass ratio of each component is 1:0.65:0.1; the compound cement has fast setting early strength The characteristics and the ball lubrication characteristics of FA contribute to the realization of the printable and buildable functions of the corresponding nano-recycled concrete.

[0070] The mass ratio of coarse sand, medium sand, fine sand and ultrafine sand in the regenerated sand is 1:1.1:1:1.

[007...

Embodiment 2

[0082] In the present embodiment, a nano-regenerated concrete is provided, and the nano-regenerated concrete includes the following components: compound cement, recycled sand, fly ash (FA), polyvinyl alcohol (PVA), graphene oxide (GO) , steel fiber, organic fiber, water reducer, coagulant, mineral admixture and water; the mass ratio of the above components is 1:2:0.2:0.05:0.002:0.05:0.02:0.01:0.01:0.05: 0.5.

[0083] Among them, the compound cement includes the following components: high belite sulfoaluminate cement (HBSC), Portland cement, and gypsum, and the mass ratio of each component is 1:1.25:0.15.

[0084] The mass ratio of coarse sand, medium sand, fine sand and ultrafine sand in the regenerated sand is 1:2.0:1.5:1.5.

[0085] The FA is Class I FA with a loss on ignition ≤ 5% specified in the GB / T 1596-2017 standard.

[0086] The PVA is a PVA aqueous solution with an average polymerization degree of 500-600 and an alcoholysis degree of 88%; the GO is dispersed in the...

Embodiment 3

[0096] In the present embodiment, a processing technology of nano-regenerated concrete is provided, which specifically includes the following steps:

[0097] S1: Dissolve 0.25kg of PVA in 5L of hot water at a temperature of 70°C to prepare a PVA aqueous solution with a concentration of 5%, an average degree of polymerization of 500-600, and a degree of alcoholysis of 88%; Under the condition of sodium acid (PVA oxidant), 0.025kg GO powder was mixed into the above-mentioned PVA aqueous solution, and the in-situ polymerization intercalation process was used to intercalate the PVA prepolymer in the GO sheet structure to obtain the GO-PVA prepolymer liquid.

[0098] S2: Add 1.0kg of FA, 0.1kg of polycarboxylate superplasticizer, and 0.01kg of concentrated hydrochloric acid (PVA catalyst) to the above-mentioned GO-PVA prepolymer liquid, and further adopt an oil bath thermosonic dispersion process (oil temperature 100°C , frequency 10kHz, power 50W, ultrasonic time 30min), wrap GO-P...

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Abstract

The invention particularly relates to nano recycled concrete, a processing technology and an application thereof. The existing nano recycled concrete also has the following defects that the corrosion prevention effect is not ideal when a conventional marine corrosion prevention technology is applied to a coastal assembly structure for 3D printing, and in addition, interlayer interface bonding and thixotropy of a conventional 3D printing material are insufficient. The invention provides nano recycled concrete. The nano recycled concrete is prepared from the following raw materials: compound cement, recycled sand, fly ash, polyvinyl alcohol, graphene oxide, steel fibers, organic fibers, a water reducing agent, a thickening time control agent, a mineral admixture and water. The 3D printing concrete has good cohesive water-retaining property and adjacent thin layer interface cohesiveness, a micro-capacitor is formed through combination of GO and PVA electrolyte to avoid formation of a corrosion battery in a concrete thin layer, and the 3D printing concrete has good marine durability and has good application prospects when being applied to coastal assembly structure engineering.

Description

technical field [0001] The invention belongs to the technical field of concrete 3D printing, and specifically relates to a nano-regenerated concrete, a processing technology of the nano-regenerated concrete and an application in preparing a coastal assembly structure. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The current status of building digitalization, industrialization, and intelligent industrial upgrading requires rapid manufacturing for different specifications and structural types to assemble building shear walls, laminated floors, laminated beams, laminated columns, prefabricated stairs, integral toilets, garbage chutes, etc. Various types of concrete precas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14E04G21/02B28B1/00B33Y70/00B33Y10/00B33Y80/00C04B111/34
CPCE04G21/02B28B1/001C04B28/14B33Y70/00B33Y10/00B33Y80/00C04B2111/343C04B2111/00181C04B7/02C04B7/32C04B18/16C04B18/08C04B24/2623C04B14/022C04B14/48C04B16/0625C04B22/002C04B2103/302C04B22/147C04B18/141C04B24/122C04B16/0633C04B14/048C04B16/0641Y02W30/91
Inventor 罗健林张纪刚李秋义高嵩侯东帅滕飞
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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