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 patents cannot effectively adapt to the extrusion process and layer-by-layer construction process of concrete materials in 3D printing, and 3D printing struc

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
Comparison scheme
Effect test

Example Embodiment

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

[0046] In parts by weight, pour 0.8-1.2 parts of fast-hardening ordinary Portland cement, 0.96-1.44 parts of F-grade fly ash and 0.64-0.96 parts of quartz sand into a mixer and stir for 2-3 minutes; then add 0.29-1.44 parts of water 2 / 3 of the mixture of 0.43 part and 0.005-0.01 part of water reducing agent is poured into the mixer and stirred for 5-6 minutes; then the remaining 1 / 3 of the mixture of water and water reducing agent is poured into the mixer and stirred for 2-3 minutes; the PVA fiber and the basalt fiber are successively put into the mixer to be stirred to obtain the concrete.

[0047] When using the above-mentioned high ductility cement-based material to pump or mechanically transport it into the print head of the 3D printer, the cross-sectional area of ​​the print head outlet is set to 64-110mm 2 , the extrusion speed is set to 0.35-0.50m 3 / h, the horiz...

Example Embodiment

[0053] Example 1:

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

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

[0056] Preparation of high ductility cement-based material 2: Pour 0.9 part of fast-hardening ordinary Portland cement 52.5R, 1.18 part of F-grade fly ash, and 0...

Example Embodiment

[0066] Example 2:

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

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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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