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Method for toughening 3D printed concrete structure through high-ductility cement-based material

A cement-based material and concrete structure technology, which is applied in the processing of building materials, building construction, construction, etc., can solve the problem that woven mesh cannot be applied, carbon fiber cloth and fiber woven mesh cannot effectively adapt to the extrusion process, and layer-by-layer construction Process and other issues, to achieve the effect of low cost, fast construction speed and simple reinforcement process

Pending Publication Date: 2018-09-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon fiber cloth and fiber woven mesh mentioned in the above-mentioned patents cannot effectively adapt to the extrusion process of concrete materials in 3D printing, the layer-by-layer construction process, etc., and the 3D printing structure often has individualized, flexible and complex Structural shape, woven mesh, etc. are not applicable
So far, there is no published method of using high ductility concrete to strengthen and toughen 3D printed concrete structures

Method used

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  • Method for toughening 3D printed concrete structure through high-ductility cement-based material
  • Method for toughening 3D printed concrete structure through high-ductility cement-based material
  • Method for toughening 3D printed concrete structure through high-ductility cement-based material

Examples

Experimental program
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Effect test

preparation example Construction

[0045] The preparation method of the high ductility cement-based material comprises the following steps:

[0046] In terms of parts by weight, pour 0.8-1.2 parts of rapid hardening ordinary Portland cement, 0.96-1.44 parts of F-class fly ash and 0.64-0.96 parts of quartz sand into the mixer and stir for 2-3 minutes; Pour 2 / 3 of the mixture of 0.43 parts and 0.005-0.01 parts of water reducer into the mixer and stir for 5-6 minutes; then pour the remaining 1 / 3 of the mixture of water and water reducer into the mixer and stir for 2-3 Minutes; PVA fibers and basalt fibers are put into a mixer in turn and stirred to obtain the concrete.

[0047] When the above-mentioned high ductility cement-based material is pumped or mechanically transported into the print nozzle of the 3D printer, the outlet cross-sectional area of ​​the print nozzle is set to 64-110mm 2 , the extrusion speed is set to 0.35-0.50m 3 / h, the horizontal printing speed is set to 280-310m / h.

[0048] The present i...

Embodiment 1

[0054] In this example, a composite beam structure is prepared by using a high-ductility cement-based material to toughen a 3D printed concrete structure. The composite beam structure to be printed in this example is a rectangular beam structure with a size of 150×150×700mm.

[0055] Preparation of ordinary concrete material 1: Pour 0.9 parts of rapid-hardening ordinary Portland cement 52.5R, 1.18 parts of F-grade fly ash, and 0.75 parts of quartz sand into an 80L planetary mixer and stir for 2 minutes; then add 0.32 parts of water and reduce Pour 2 / 3 of the mixture of 0.006 parts of water agent into the mixer and stir for 5 minutes; then pour the remaining 1 / 3 of the mixture of water and water reducer into the mixer and stir for 2 minutes to obtain 3D printed concrete;

[0056] Preparation of high-ductility cement-based material 2: Pour 0.9 parts of rapid-hardening ordinary Portland cement 52.5R, 1.18 parts of F-class fly ash, and 0.75 parts of quartz sand into an 80L planetar...

Embodiment 2

[0067] In this example, except that the layer thickness of the high-ductility cement-based material is changed to 60 mm, and the thickness of the plain concrete layer is changed to 90 mm, the other manufacturing processes and material parameters are the same as those in Example 1, which is equivalent to the fiber cement-based material. 40% of the overall structure. With reference to "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB / T50081-2002), the concrete beam of this embodiment is tested for four-point bending mechanical properties. The loading scheme is as follows figure 2 shown. The bending stress and mid-span deflection curves obtained during the experiment are plotted in Figure 4 , the curve strongly demonstrates that this embodiment adopts the method to toughen the plain concrete, and the toughened composite beam has the characteristics of high ductility. Test results: The peak load is 39.0kN, the crack initiation deflection is 0.642mm,...

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Abstract

The invention relates to a method for toughening a 3D printed concrete structure through a high-ductility cement-based material. The method comprises the following steps that a composite structure three-dimensional digital model is designed, specifically, firstly, a composite beam structure is designed or modeled through three-dimensional modeling software or a three-dimensional scanner, the geometric structure information of the composite beam structure three-dimensional model to be printed is obtained, then the three-dimensional model is divided into two parts according to the geometrical form and force condition of the to-be-printed composite beam structure, one part of the three-dimensional model is an ordinary concrete layer used for printing ordinary concrete, the other part of the three-dimensional model is a high-ductility cement-based material reinforcing layer used for printing the high-ductility cement-based material, and the composite structure three-dimensional digital model is constituted by the high-ductility cement-based material reinforcing layer and the ordinary concrete layer; an STL file is generated and repaired; the three-dimensional model is sliced layer by layer; a printing path is planned and designed; composite structure 3D printing is conducted; and concrete structure curing is conducted. The method is simple in process, high in construction speed, low in labor cost and high in automation degree.

Description

technical field [0001] The invention belongs to the field of building structure engineering, and in particular relates to a method for toughening a 3D printed concrete structure with a high-ductility cement-based material. Background technique [0002] 3D printing concrete technology has many advantages such as design freedom, construction flexibility, fast construction speed, low labor cost, high degree of automation, and low environmental pollution. In recent years, it has received extensive attention and significant development in the field of civil engineering. Instances such as 3D printed bridges and 3D printed houses are often reported, which largely confirm the feasibility of applying 3D printing technology to the field of civil engineering. The preparation of 3D printing cement-based materials is the key to promote the application of this technology in engineering practice. However, the salient features of cement concrete are low ultimate elongation and obvious brit...

Claims

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Application Information

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IPC IPC(8): E04G21/02
CPCE04G21/02Y02A30/30
Inventor 马国伟王里李之建
Owner HEBEI UNIV OF TECH
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