Mortar as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building materials, in particular to mortar and a preparation method and application thereof. The raw materials of the mortar comprise cement, aggregate and water; wherein the aggregate comprises a first component and tailings; the first component has a resin and a fibrous material. According to the mortar as well as the preparation method and the application thereof provided by the invention, two industrial wastes, namely the tailings and the solid wastes with the matrix resin and / or the fiber material, are introduced, so that the compressive strength and the breaking strength of the mortar can be ensured, and meanwhile, the resource utilization of the two industrial wastes can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, in particular to mortar and a preparation method and application thereof. Background Art

[0002] With the rapid development of the wind power industry, a large number of wind turbine blades need to be disposed of after reaching the end of their service life, and the accumulation of iron tailings has also caused environmental problems. Therefore, finding an effective way to utilize this waste is of great environmental and economic significance.

[0003] Based on the above problems, the present invention is proposed. Summary of the Invention

[0004] In order to solve the above problems in the prior art, the present invention provides a mortar and its preparation method and application, so as to ensure the compressive and flexural strength of the mortar while realizing the resource utilization of two industrial wastes - vanadium titanium iron tailings and waste wind turbine blades.

[0005] Based on this, the present invention has the following technical solutions: In a first aspect, the present invention provides a mortar, the raw materials of which include cement, aggregate and water; wherein the aggregate includes a first component and tailings; and the first component includes resin and fiber material.

[0006] Preferably, in the aggregate, the amount of the first component is less than 15 wt%.

[0007] Preferably, in the aggregate, the amount of the first component is 5-15 wt%.

[0008] The present invention has found that by controlling the amount of the first component in the aggregate to be within the above range, all parts of the wind turbine blades can be universally used without limiting the specific parts or types, as long as the matrix resin and fiber material are ensured. The material requirements are relatively low, and it is a good method for solid waste treatment.

[0009] Specifically, after the first component and tailings are added to the mortar, the compressive strength of the mortar gradually decreases with the increase of the fan blade content, and the flexural strength increases with the increase of the fan blade content. When the fan blade content is within the above range, the flexural strength of the mortar can be significantly improved with little impact on the compressive strength.

[0010] Preferably, the first component includes waste fan blades and / or waste circuit boards.

[0011] The present invention found that the aggregates of the mortar are all solid waste. By applying solid waste with matrix resin and / or fiber materials such as waste fan blades and / or waste circuit boards and tailings solid waste to the preparation of mortar, a mortar with good flexural resistance can also be obtained.

[0012] Preferably, the mass ratio of the first component to the tailings is 5-20:1.

[0013] Preferably, the particle size of the first component after crushing is controlled to be less than 4.75 mm. Preferably, the particle size of the tailings is controlled to be less than 4.75 mm.

[0014] Preferably, the mass ratio of the cement to the aggregate is 1:(2-4).

[0015] Preferably, the raw materials include the following components in parts by weight: 15-25 parts of cement; 50~70 parts of aggregate; 5-10 parts water.

[0016] Preferably, the raw materials include the following components in parts by weight: 15-25 parts of cement; The first group has 2 to 10 parts; 50~65 parts of tailings; 5-10 parts water.

[0017] Preferably, the tailings are vanadium-titanium-iron tailings.

[0018] In a second aspect, the present invention provides a method for preparing the above-mentioned mortar, comprising: S1: crush the first component and select and retain particles with a size of 4.75 mm for later use; S2: mixing the first component crushed and screened in S1, vanadium-titanium-iron tailings, cement and water, and stirring to obtain a mixed slurry; S3: homogenizing, shaping and curing the mixed slurry in sequence to obtain the mortar.

[0019] In the present invention, those skilled in the art may adopt conventional homogenization, shaping and curing methods, which are not limited herein.

[0020] Preferably, the mixed slurry described in S2 is prepared into mortar using the method of GB / T17671-2021.

[0021] In a third aspect, the present invention provides a building material comprising the above-mentioned mortar.

[0022] The mortar provided by the present invention, as well as its preparation method and application, can realize resource utilization of two industrial wastes, namely tailings and solid waste containing resin and fiber materials, by using two kinds of industrial wastes, thereby ensuring the compressive and flexural strength of the mortar. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] In the following examples, the mixed slurry described in S2 was prepared into mortar using the method of GB / T17671-2021, and flexural and compressive tests were performed simultaneously.

[0025] In the following examples and comparative examples, experiments were conducted using 42.5 Jinyu Cement produced by Chengde Jinyu Cement, vanadium-titanium-iron tailings produced in Chengde, and waste blades processed by Guoneng Star Company.

[0026] Example 1

[0027] This embodiment provides a mortar, and the preparation method thereof comprises the following steps: S1: Cut and crush the waste wind turbine blades, and screen the crushed waste wind turbine blades to obtain the part below 4.75mm for testing; select vanadium titanium iron tailings and screen the part below 4.75 for testing.

[0028] S2: 67.5 g of the crushed and screened waste fan blades in S1, 1282.5 g of vanadium-titanium-iron tailings, 450 g of cement, and 225 g of water were mixed and stirred to obtain a mixed slurry; the waste fan blades accounted for 5 wt% of the aggregate.

[0029] S3: homogenizing, shaping and curing the mixed slurry in sequence to obtain the mortar.

[0030] Example 2

[0031] This embodiment provides a mortar, and the preparation method thereof differs from that of Example 1 only in that: in S2, 135 g of screened waste fan blades and 1215 g of vanadium-titanium-iron tailings are used; and the waste fan blades account for 10 wt % of the aggregate.

[0032] Example 3

[0033] This embodiment provides a mortar, and the preparation method thereof differs from that of Example 1 only in that: in S2, the screened waste fan blades are 202.5 g and the vanadium-titanium-iron tailings are 1147.5 g; and the waste fan blades account for 15 wt % of the aggregate.

[0034] Comparative Example 1

[0035] This comparative example provides a mortar, the preparation method of which differs from that of Example 1 only in that: in S2, the screened waste fan blades are 0 g and the vanadium-titanium-iron tailings are 1350 g; and the aggregate does not contain waste fan blades.

[0036] Comparative Example 2

[0037] This comparative example provides a mortar, the preparation method of which differs from that of Example 1 only in that: in S2, the screened waste fan blades are 229.5 g and the vanadium-titanium-iron tailings are 1120.5 g; and the waste fan blades account for 17 wt % of the aggregate.

[0038] Test example

[0039] Table 1 Test results of corrosion and compressive strength (unit: MPa) at the mold age:

[0040] Test results show that when waste fan blades and tailings are added to the mortar, the compressive strength of the mortar gradually decreases with increasing fan blade content, while the flexural strength increases. At a fan blade content of 5-15wt%, the flexural strength of the mortar can be significantly improved with minimal impact on the compressive strength. Experiments have shown that when the fan blade content is 8-12wt%, both compressive and flexural strength are achieved, while also being more universal for fan blades and significantly reducing the difficulty of processing.

[0041] When the admixture of fan blades exceeds 15wt%, the water absorption of the material will increase greatly. The cement and aggregate of the samples prepared with the same amount of water added are difficult to be fully combined together. The flexural and compressive strengths of the prepared samples after curing are extremely low, and they break during the picking process.

[0042] In the present invention, waste circuit boards and waste fan blades have comparable effects. By controlling the amount of the first component having resin and fiber material in the aggregate, the selection of raw materials, including the universality of application in specific parts, can be improved. Solid waste that is difficult to handle can well meet the needs of mortar preparation, greatly reducing the difficulty of solid waste treatment.

[0043] By controlling the amount of fan blades in the aggregate, the present invention ensures that the mortar is both lightweight and has good mechanical properties. Specifically, the lightweight mortar produced by the present invention has low density, high strength, and good durability. Due to the environmentally friendly raw materials, it has significant sustainable development advantages.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A mortar, characterized in that: The raw materials include cement, aggregate and water; wherein the aggregate includes a first component and tailings; and the first component includes resin and fiber material.

2. The mortar according to claim 1, characterized in that In the aggregate, the amount of the first component is less than 15wt%; preferably, in the aggregate, the amount of the first component flakes is 5-15wt%.

3. The mortar according to claim 1, characterized in that: The first component includes waste fan blades and / or waste circuit boards.

4. The mortar according to any one of claims 1 to 3, characterized in that: The mass ratio of the first component to the tailings is 5-20:

1.

5. The mortar according to any one of claims 1 to 4, characterized in that: The particle size of the first component after crushing is controlled to be less than 4.75 mm.

6. The mortar according to any one of claims 1 to 5, characterized in that: The mass ratio of the cement to the aggregate is 1:(2-4).

7. The mortar according to any one of claims 1 to 6, characterized in that: The raw materials include the following components in parts by weight: 15~25 parts of cement; Aggregate 50~70 parts; 5-10 parts water; Preferably, the raw material comprises the following components in parts by weight: 15~25 parts of cement; The first group has 2 to 10 parts; Tailings 50~65 parts; 5~10 parts water 8. The mortar according to any one of claims 1 to 7, characterized in that: The tailings are vanadium-titanium-iron tailings.

9. The method for preparing the mortar according to any one of claims 1 to 8, characterized in that: include: S1: crush the first component, screen and retain particles with a diameter of 4.75 mm for later use; S2: mixing the first component crushed and screened in S1, tailings, cement and water, and stirring to obtain a mixed slurry; S3: homogenizing, shaping and curing the mixed slurry in sequence to obtain the mortar.

10. A building material, characterized in that: A mortar comprising the mortar according to any one of claims 1 to 8.

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