All-solid-waste traffic engineering accessory component 3D printing material and preparation method thereof

Abstract

The invention discloses an all-solid-waste traffic engineering accessory component 3D printing material and a preparation method thereof, and belongs to the field of building materials. The all-solid-waste traffic engineering accessory component 3D printing material is prepared from coal-fired furnace slag, coal gangue, water, fibers, fly ash, water glass, a thixotropic agent and a sodium hydroxide solution according to a specific ratio. Compared with the prior art, the 3D printing material disclosed by the invention has the characteristics of good fluidity, high strength after molding, large rigidity, good stability and the like, can completely replace cement by utilizing a large amount of industrial solid wastes, is beneficial to environmental protection and cost saving, and has good popularization and application values.

Description

Technical Field

[0001] The present invention relates to the field of transportation engineering materials, and specifically provides a 3D printing material for ancillary components of an all-solid waste transportation engineering project and a preparation method thereof. Background Art

[0002] In recent years, with the increasing attention paid to environmental protection and pollutant treatment, the country has increased its scientific research efforts on various industrial solid wastes. Various industries have actively explored the application of solid waste materials such as coal gangue, coal slag, and fly ash, but the utilization rate of various solid waste materials is still low. The discharge of large amounts of coal gangue, coal slag, and fly ash not only occupies a large amount of land and pollutes the environment, but also imposes a great economic burden on enterprises.

[0003] As a rapid prototyping technology, 3D printing has been applied in the preparation of engineering components. However, in order to meet the performance requirements of both 3D printing and engineering applications, the proportion of solid waste is relatively low. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a 3D printing material for all-solid waste transportation engineering auxiliary components with excellent road performance.

[0005] A further technical task of the present invention is to provide a method for preparing the above-mentioned 3D printing material for auxiliary components of all-solid waste transportation engineering.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a 3D printing material for all-solid waste transportation engineering auxiliary components, which is made of the following materials in weight ratio:

[0007]

[0008] The gelling material is composed of fly ash, water glass, a thixotropic agent and a sodium hydroxide solution in a mass ratio of (300-450): (5-15): (10-25): (20-35);

[0009] The particle size of the coal-fired slag is less than 0.5 mm;

[0010] The particle size of the coal gangue is 5-20 mm.

[0011] Preferably, the weight ratio of each material of the 3D printing material of the present invention is as follows:

[0012]

[0013] Preferably, in the coal gangue, the mass ratio of the two particle sizes of 5-10 mm and 10-20 mm is 3:(5-10). The coal gangue is burned coal gangue, washed coal gangue or over-burned coal gangue.

[0014] Preferably, the mass ratio of fly ash, water glass, thixotropic agent and sodium hydroxide solution in the cementitious material is (350-450): (10-15): (15-20): (30-35). The fly ash is low-grade fly ash of Class II or below. The thixotropic agent is silicon dioxide.

[0015] Preferably, the fibers are polypropylene fibers.

[0016] Preferably, the flow value of the 3D printing material of the present invention is 160-180 mm.

[0017] Preferably, the density of the engineering auxiliary component printed with the 3D printing material is 2400-2600 kg / m 3 , the compressive strength is 20-40MPa.

[0018] The method for preparing the 3D printing material of the all-solid waste transportation engineering auxiliary component of the present invention comprises the following steps:

[0019] (1) fly ash, water glass, thixotropic agent and sodium hydroxide solution are uniformly mixed to obtain a cementitious material;

[0020] (2) Coal slag, coal gangue, cementitious material, water and fiber are mixed evenly to obtain 3D printing materials for all-solid waste transportation engineering auxiliary components for 3D printing.

[0021] Preferably, in step (1), fly ash, water glass, thixotropic agent and sodium hydroxide solution are stirred at a speed of 110-130 rpm for 20-40 s to obtain a cementitious material.

[0022] Preferably, in step (2), the coal slag, coal gangue, cementitious material, water and fiber are stirred at a speed of 70-90 rpm for 40-60 s to obtain a 3D printing material for all-solid waste transportation engineering accessory components for 3D printing.

[0023] The present invention is based on the concept of synergistic utilization of multiple solid wastes, and uses solid wastes such as coal gangue, coal slag, and fly ash as raw materials. The coal gangue is crushed and processed to obtain coarse aggregate, coal slag is used as fine aggregate, and fly ash is used as the main agent of cementitious material, together with water and fiber, to form a 3D printing material for auxiliary components of transportation engineering using all solid waste. Compared with the existing technology, it has the following outstanding beneficial effects:

[0024] (1) The present invention uses bulk industrial solid waste as raw materials to replace cement and other materials produced with high energy consumption, which can not only reduce material costs, save energy, and reduce the emission of greenhouse gases such as carbon dioxide; it can also effectively reduce the occupation of land resources and pollution caused by waste accumulation.

[0025] (ii) The 3D printing material of the present invention not only has good fluidity when a large amount of industrial solid waste is used, which is convenient for printing at the outlet of the 3D printer without vibration, but also has excellent engineering properties such as high strength, high rigidity, good stability, and the ability to print special-shaped components, which can reduce the cost expenditure in the component manufacturing process and improve production efficiency.

[0026] (III) The preparation process adopts a method of first rapid stirring and then slow stirring, which can not only make the materials fully mixed, but also ensure that the materials maintain good workability during extrusion and ensure the working state of the materials. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments, but this is not intended to limit the present invention.

[0028] The coal gangue described in the embodiment of the present invention is burned coal gangue; the fly ash described is low-grade fly ash of Class II and below.

[0029] Example 1

[0030] In this embodiment, solid wastes such as coal gangue and coal slag are used as raw materials. The coal gangue is crushed and processed to obtain coarse aggregate, and the coal slag is used as fine aggregate. Fly ash is used as the main agent of the cementitious material, supplemented with water glass, thixotropic agent, sodium hydroxide solution, and mixed with polypropylene fiber and water to obtain all-solid waste transportation engineering auxiliary components 3D printing material.

[0031] The weight ratio of each raw material is as follows:

[0032]

[0033]

[0034] The mass ratio of coal gangue with particle sizes of 5-10mm and 10-20mm is 3:7;

[0035] The particle size of coal-fired slag shall not exceed 0.5 mm.

[0036] Preparation method:

[0037] Add fly ash, water glass, thixotropic agent and sodium hydroxide solution into a horizontal mixer in turn, stir slowly at 120 rpm for 30 seconds, then add coal gangue, coal slag, water and polypropylene fiber, and stir rapidly at 80 rpm for 60 seconds to obtain a solid waste-based transportation engineering auxiliary component mixture (flow value 165 mm).

[0038] Add the mixture into the mixing chamber of the 3D printer, set the extrusion ratio to 70, and the printing speed to 75mm / min.

[0039] The initial setting time of the mixture is 450min, the final setting time is 620min, and the average flexural strength of the three specimens is 4.5MPa, the water absorption rate is 5.0%, and the density is 2460-2500kg / m 3 , 28d compressive strength is 33.5MPa.

[0040] Embodiment 2:

[0041] The difference between this embodiment and embodiment 1 is only that the raw material ratio and printing parameters are different.

[0042] The weight ratio of each raw material is as follows:

[0043]

[0044] The mass ratio of coal gangue with particle sizes of 5-10mm and 10-20mm is 3:7;

[0045] The particle size of coal-fired slag shall not exceed 0.5 mm.

[0046] The flow value of the mixture is 172 mm, the extrusion ratio of the 3D printer is 60, and the printing speed is 70 (mm / min).

[0047] The initial setting time of the mixture is 440 minutes, and the final setting time is 600 minutes. The average flexural strength of the three specimens was finally measured to be 4.3MPa, the water absorption rate was 4.6%, and the density was 2500-2600kg / m 3 , 28d compressive strength is 36.5MPa.

[0048] It has been observed that the 3D printing material of all-solid waste transportation engineering auxiliary components has good fluidity during the printing process and can reach a certain strength in a short time after filling, which is convenient for printing special-shaped components.

[0049] It should be clear that what is described in the present invention is only a representative embodiment, and does not limit other inventions of similar form. All inventions can be modified in the form of this invention. Any modification based on the concept and principle of the present invention will infringe the protection scope of the present invention.

Claims

1. 3D printing materials for all-solid waste transportation engineering auxiliary components, characterized in that: Made from the following materials in weight ratio: The gelling material is composed of fly ash, water glass, a thixotropic agent and a sodium hydroxide solution in a mass ratio of (300-450): (5-15): (10-25): (20-35); The particle size of the coal-fired slag is less than 0.5 mm; The particle size of the coal gangue is 5-20 mm.

2. The 3D printing material for all-solid waste transportation engineering auxiliary components according to claim 1 is characterized in that: The mass ratio of coal gangue with particle sizes of 5-10mm and 10-20mm is 3:(5-10).

3. The 3D printing material for all-solid waste transportation engineering auxiliary components according to claim 1 is characterized in that: The fibers are polypropylene fibers.

4. The 3D printing material for all-solid waste transportation engineering auxiliary components according to claim 1 is characterized in that: The flow value of 3D printing materials is 160-180mm.

5. The 3D printing material for all-solid waste transportation engineering auxiliary components according to claim 1 is characterized in that: The density of the engineering auxiliary components printed with the 3D printing material is 2400-2600kg / m 3 , the compressive strength is 20-40MPa.

6. The method for preparing 3D printing materials for all-solid waste transportation engineering auxiliary components according to claim 1, 2, 3, 4 or 5, characterized in that: The following steps are involved: (1) fly ash, water glass, thixotropic agent and sodium hydroxide solution are uniformly mixed to obtain a cementitious material; (2) Coal slag, coal gangue, cementitious material, water and fiber are mixed evenly to obtain 3D printing materials for all-solid waste transportation engineering auxiliary components for 3D printing.

7. The method for preparing 3D printing materials for all-solid waste transportation engineering auxiliary components according to claim 6, characterized in that: Step (1) Fly ash, water glass, thixotropic agent and sodium hydroxide solution are stirred at a speed of 110-130 rpm for 20-40 s to obtain a gelling material; Step (2) The coal slag, coal gangue, cementitious material, water and fiber are stirred at a speed of 70-90 rpm for 40-60 s to obtain a 3D printing material for ancillary components of a full solid waste transportation engineering project for 3D printing.

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