A carbonized fiberglass material, its preparation method, and its application in cement concrete.

Abstract

This invention relates to the field of solid waste treatment technology, specifically disclosing a carbonized fiberglass material, its preparation method, and its application in cement concrete. The invention provides a method for preparing carbonized fiberglass material from fiberglass waste through crushing, carbonization, and surface silane modification. The resulting carbonized fiberglass, when added to cement concrete, can improve the physical and mechanical properties of the concrete, effectively solving the technical problem that the application of fiberglass waste in cement concrete significantly reduces the mechanical properties of the concrete. It also provides a new approach to treating fiberglass waste as a solid waste raw material.

Description

Technical Field

[0001] This invention relates to the field of solid waste treatment technology, specifically disclosing a carbonized fiberglass material, its preparation method, and its application in cement concrete. Background Technology

[0002] With the continuous growth in the production of fiberglass products, the total amount of fiberglass waste generated has also increased. The service life of fiberglass products is generally 15-20 years, and a large amount of fiberglass waste that has reached the end of its service life is now appearing. In the production process of fiberglass products, a large amount of fiberglass scraps are also generated, which become difficult-to-handle solid waste. In order to alleviate the pressure of solid waste treatment, in existing technologies, fiberglass waste can be used as filler to prepare refractory materials, wear-resistant materials, and rubber fillers, as well as as raw materials for cement production, or as a reducing agent in blast furnace ironmaking, and can also be used to prepare bonding mortar.

[0003] Currently, the largest application of fiberglass waste remains in the cement concrete sector. Existing technologies primarily utilize fiberglass waste to replace fine aggregates in cement-based concrete preparation. Experimental results show that while the initial surface absorption rate and water absorption rate of these cement-based concrete materials are improved, their mechanical properties are significantly reduced. This is because current technologies mainly involve directly physically crushing the fiberglass waste before applying it to concrete. However, the long fibers in the crushed fiberglass waste are primarily plastic fibers, which often reduce the flowability, mixability, and mechanical properties of the concrete. Furthermore, the crushed fiberglass waste increases the water demand of fresh concrete, severely impacting its mechanical and durability properties. Therefore, developing a suitable method for utilizing fiberglass waste is of great significance for alleviating solid waste pressure. Summary of the Invention

[0004] To address the technical problem that the application of fiberglass waste in cement concrete significantly reduces the mechanical properties of the concrete, this invention provides a carbonized fiberglass material, its preparation method, and its application in cement concrete. The method involves carbonizing pulverized fiberglass waste and then modifying it with an alkoxysilane coupling agent to obtain a novel carbonized fiberglass material. Using this carbonized fiberglass material in cement concrete does not require increasing the water demand of freshly mixed concrete and can improve the mechanical properties of the concrete.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] The first aspect of this invention provides a method for preparing carbonized fiberglass material, comprising the following steps:

[0007] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles;

[0008] Step 2: Under an inert atmosphere, the fiberglass waste powder is calcined at 500℃-600℃ to obtain a carbonized mixture;

[0009] Step 3: The carbonized mixture is ball-milled, impregnated in an alkoxysilane coupling agent, filtered, and dried to obtain carbonized fiberglass material.

[0010] Compared to existing technologies, this invention provides a method for preparing carbonized fiberglass material. By crushing, carbonizing, and surface-modifying fiberglass waste with an alkoxysilane coupling agent, the original fiberglass waste is transformed into a mixture of surface-modified short carbon fibers, short glass fibers, and carbon powder. After carbonization, the original fiberglass waste is coated with a layer of carbon on the surface of the glass fibers, giving it the characteristics of both carbon and glass fibers, thus effectively improving the mechanical properties of the carbonized fiberglass material. The short carbon fibers and glass fibers treated with the alkoxysilane coupling agent can inhibit crack propagation through pull-out, breakage, and pinning effects, further improving the flexural strength of the carbonized fiberglass material. Furthermore, the carbon powder treated with the alkoxysilane coupling agent increases the density of the carbonized fiberglass material. When applied to cement concrete, the presence of carbon powder not only offsets the reduction in compressive strength of the concrete caused by the addition of short carbon fibers and glass fibers but also improves the compressive strength of the resulting concrete material. Moreover, the carbon powder treated with the alkoxysilane coupling agent can effectively reduce the corrosion effect on reinforcing bars or steel fibers.

[0011] Preferably, in step one, the particle size of the obtained fiberglass waste particles is 1mm-20mm.

[0012] Preferably, in step two, the calcination time is 2h-6h.

[0013] Preferably, in step three, the ball milling speed is 300 r / min-500 r / min, and the ball milling time is 5 min-10 min.

[0014] Preferably, in step three, the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1-1.1:1.

[0015] Preferably, in step three, the mass ratio of the carbonized mixture to the alkoxysilane coupling agent is 1-1.2:5-8.

[0016] Preferably, in step three, the drying temperature is 70℃-90℃ and the drying time is 1h-2h.

[0017] The second aspect of the present invention provides a carbonized fiberglass material, which is prepared using the method for preparing the carbonized fiberglass material.

[0018] A third aspect of the present invention provides a cement concrete comprising the aforementioned carbonized fiberglass material.

[0019] Preferably, the amount of carbonized fiberglass material added is 0.5%-8% of the total mass of cement concrete.

[0020] In summary, the method for preparing carbonized fiberglass material provided by this invention involves crushing, carbonizing, and surface-modifying fiberglass waste with an alkoxysilane coupling agent to obtain the carbonized fiberglass material. Adding this carbonized fiberglass material to cement concrete does not increase the water demand of the fresh concrete; instead, it improves the mechanical properties of the concrete. The resulting cement concrete material exhibits a 28-day compressive strength as high as 64.84 MPa, a 28-day flexural strength as high as 19.79 MPa, and a 28-day splitting tensile strength as high as 8.1 MPa. This effectively solves the technical problem in existing technologies where the application of fiberglass waste in cement concrete significantly reduces the mechanical properties of the concrete, and also provides a new approach to the treatment and utilization of fiberglass waste. Attached Figure Description

[0021] Figure 1 The image shows a micrograph of the carbonized fiberglass material obtained in Example 1. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] This embodiment provides a method for preparing carbonized fiberglass material, including the following steps:

[0025] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 12mm;

[0026] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 600°C for 4 hours to obtain a carbonized mixture;

[0027] Step 3: Place the carbonized mixture in a planetary ball mill and mill for 8 minutes at a ball milling speed of 400 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1:7, filter, and dry at 80°C to obtain carbonized fiberglass material.

[0028] Example 2

[0029] This embodiment provides a method for preparing carbonized fiberglass material, including the following steps:

[0030] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 8mm;

[0031] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 520°C for 6 hours to obtain a carbonized mixture;

[0032] Step 3: Place the carbonized mixture in a planetary ball mill and mill it for 10 minutes at a ball milling speed of 350 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1.2:6, filter, and dry at 80°C to obtain carbonized fiberglass material.

[0033] Example 3

[0034] This embodiment provides a method for preparing carbonized fiberglass material, including the following steps:

[0035] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 18mm;

[0036] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 510°C for 6 hours to obtain a carbonized mixture;

[0037] Step 3: Place the carbonized mixture in a planetary ball mill and mill it for 10 minutes at a ball milling speed of 370 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1.1:7, filter, and dry at 80°C to obtain carbonized fiberglass material.

[0038] Example 4

[0039] This embodiment provides a method for preparing carbonized fiberglass material, including the following steps:

[0040] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 4mm;

[0041] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 550°C for 2 hours to obtain a carbonized mixture;

[0042] Step 3: Place the carbonized mixture in a planetary ball mill and mill it for 5 minutes at a ball milling speed of 500 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1:7, filter, and dry at 80°C to obtain carbonized fiberglass material.

[0043] Example 5

[0044] This embodiment provides a method for preparing carbonized fiberglass material, including the following steps:

[0045] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 18mm;

[0046] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 600°C for 4 hours to obtain a carbonized mixture;

[0047] Step 3: Place the carbonized mixture in a planetary ball mill and mill it for 10 minutes at a ball milling speed of 500 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1:8, filter, and dry at 85°C to obtain carbonized fiberglass material.

[0048] Comparative Example 1

[0049] This comparative example provides a method for preparing fiberglass material, which differs from Example 1 in that it does not involve carbonization treatment of fiberglass waste, and includes the following steps:

[0050] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 12mm;

[0051] Step 2: Place the fiberglass waste particles in a planetary ball mill and mill for 8 minutes at a ball milling speed of 400 r / min to obtain fiberglass mixture powder. Mix the fiberglass mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1:7, filter, and dry at 80°C to obtain fiberglass material.

[0052] Comparative Example 2

[0053] This comparative example provides a method for preparing fiberglass material, which differs from Example 1 in that it does not involve surface treatment of fiberglass waste with an alkoxysilane coupling agent, and includes the following steps:

[0054] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 12mm;

[0055] Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 550°C for 4 hours to obtain a carbonized mixture;

[0056] Step 3: Place the carbonized mixture in a planetary ball mill and mill it for 8 minutes at a ball milling speed of 400 r / min to obtain carbonized mixture powder. Dry the carbonized mixture powder at 80°C to obtain fiberglass material.

[0057] Comparative Example 3

[0058] This comparative example provides a method for preparing fiberglass material, which differs from Example 1 in that it does not involve carbonization treatment and alkoxysilane coupling agent surface treatment of fiberglass waste. The method includes the following steps:

[0059] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 12mm;

[0060] Step 2: Place the fiberglass waste particles in a planetary ball mill and mill them for 8 minutes at a ball milling speed of 400 r / min to obtain fiberglass mixture powder. Dry the fiberglass mixture powder at 80°C to obtain fiberglass material.

[0061] Comparative Example 4

[0062] This comparative example provides a method for preparing carbonized fiberglass material, which differs from Example 1 in that the calcination in step two is not carried out under an inert atmosphere, and includes the following steps:

[0063] Step 1: Crush the fiberglass waste to obtain fiberglass waste particles with a particle size of 12mm;

[0064] Step 2: Calcine the fiberglass waste particles at 600°C for 4 hours to obtain a carbonized mixture;

[0065] Step 3: Place the carbonized mixture in a planetary ball mill and mill for 8 minutes at a ball milling speed of 400 r / min to obtain carbonized mixture powder. Mix the carbonized mixture powder with an alkoxysilane coupling agent (the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1:1) at a mass ratio of 1:7, filter, and dry at 80°C to obtain carbonized fiberglass material.

[0066] Experimental Example 1

[0067] This experimental example applies the carbonized fiberglass material obtained in Example 1 to cement concrete, as detailed below:

[0068] The cement concrete comprises the following components by mass percentage: 12% cement, 4% mineral powder, 30% medium sand, 46% gravel, 6.5% water, 0.4% admixture, and 1.1% carbonized fiberglass material provided in Example 1. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0069] Experimental Example 2

[0070] This experimental example applies the carbonized fiberglass material obtained in Example 2 to cement concrete, as detailed below:

[0071] The cement concrete comprises the following components by mass percentage: 11% cement, 3.8% mineral powder, 30% medium sand, 45.1% aggregate, 6.7% water, 0.3% admixture, and 3.1% carbonized fiberglass material provided in Example 2. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0072] Experimental Example 3

[0073] This experimental example applies the carbonized fiberglass material obtained in Example 3 to cement concrete, as detailed below:

[0074] The cement concrete comprises the following components by mass percentage: 11% cement, 3.8% mineral powder, 30% medium sand, 45.1% aggregate, 6.7% water, 0.3% admixture, and 3.1% carbonized fiberglass material provided in Example 3. The components are weighed and mixed evenly to obtain the cement concrete material.

[0075] Test Example 4

[0076] This experimental example applies the carbonized fiberglass material obtained in Example 4 to cement concrete, as detailed below:

[0077] The cement concrete comprises the following components by mass percentage: 11% cement, 3.8% mineral powder, 30% medium sand, 45.1% aggregate, 6.7% water, 0.3% admixture, and 3.1% carbonized fiberglass material provided in Example 3. The components are weighed and mixed evenly to obtain the cement concrete material.

[0078] Experimental Example 5

[0079] This experimental example applies the carbonized fiberglass material obtained in Example 5 to cement concrete, as detailed below:

[0080] The cement concrete comprises the following components by mass percentage: 11% cement, 3.8% mineral powder, 30% medium sand, 45.1% aggregate, 6.7% water, 0.3% admixture, and 3.1% carbonized fiberglass material provided in Example 3. The components are weighed and mixed evenly to obtain the cement concrete material.

[0081] Comparative Test Example 1

[0082] This experimental example applies the carbonized fiberglass material obtained in Comparative Example 1 to cement concrete, as detailed below:

[0083] The cement concrete comprises the following components by mass percentage: 12% cement, 4% mineral powder, 30% medium sand, 46% aggregate, 6.5% water, 0.4% admixture, and 1.1% carbonized fiberglass material provided in Comparative Example 1. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0084] Comparative Test Example 2

[0085] This experimental example applies the carbonized fiberglass material obtained in Comparative Example 2 to cement concrete, as detailed below:

[0086] The cement concrete comprises the following components by mass percentage: 12% cement, 4% mineral powder, 30% medium sand, 46% aggregate, 6.5% water, 0.4% admixture, and 1.1% carbonized fiberglass material provided in Comparative Example 2. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0087] Comparative Test Example 3

[0088] This experimental example applies the carbonized fiberglass material obtained in Comparative Example 3 to cement concrete, as detailed below:

[0089] The cement concrete comprises the following components by mass percentage: 12% cement, 4% mineral powder, 30% medium sand, 46% aggregate, 6.5% water, 0.4% admixture, and 1.1% carbonized fiberglass material provided in Comparative Example 3. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0090] Comparative Test Example 4

[0091] This experimental example applies the carbonized fiberglass material obtained in Comparative Example 4 to cement concrete, as detailed below:

[0092] The cement concrete comprises the following components by mass percentage: 12% cement, 4% mineral powder, 30% medium sand, 46% aggregate, 6.5% water, 0.4% admixture, and 1.1% carbonized fiberglass material provided in Comparative Example 3. Each component is weighed and mixed evenly to obtain the cement concrete material.

[0093] Comparative Test Example 5

[0094] This experimental example provides a cement concrete material with added carbon fiber, the details of which are as follows:

[0095] According to the design proportion of the cement concrete material, which includes the following components by mass percentage: 12% cement, 4% mineral powder, 31% medium sand, 46% gravel, 6.5% water, and 0.5% admixture, weigh each component, mix them evenly, and obtain the cement concrete material.

[0096] To further verify the technical effect of the present invention, the present invention conducted relevant mechanical property tests on the cement concrete materials obtained from test examples 1-3 and comparative test examples 1-4 according to the national standard GB / T50081-2019 (Standard for Test Methods of Physical and Mechanical Properties of Concrete). The test results are shown in Table 1.

[0097] Table 1. Test results of mechanical properties of cement concrete materials obtained from each experimental example and each comparative example. As shown in Table 1, this invention adds carbonized fiberglass material, prepared from fiberglass waste that has undergone carbonization and surface treatment, to cement concrete. The resulting cement concrete exhibits significantly improved physical and mechanical properties. In particular, the carbonized fiberglass material provided in Example 1 demonstrates the most superior mechanical properties. Microscopic observation of the carbonized fiberglass material obtained in Example 1 reveals that its surface is completely coated with carbon, making the normally colorless and transparent fiberglass material appear black and semi-transparent. The carbonized fiberglass material provided by this invention effectively solves the technical problem in the prior art where the application of fiberglass waste in cement concrete significantly reduces the mechanical properties of concrete, greatly alleviating the pressure of solid waste disposal and providing a new approach to the reuse of fiberglass waste.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing carbonized fiberglass material, characterized in that: Includes the following steps: Step 1: Crush the fiberglass waste to obtain fiberglass waste particles; Step 2: Under an inert atmosphere, the fiberglass waste particles are calcined at 500℃-600℃ to obtain a carbonized mixture; Step 3: The carbonized mixture is ball-milled, impregnated in an alkoxysilane coupling agent, filtered, and dried to obtain carbonized fiberglass material.

2. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step one, the particle size of the obtained fiberglass waste particles is 1mm-20mm.

3. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step two, the calcination time is 2h-6h.

4. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step three, the ball milling speed is 300 r / min-500 r / min, and the ball milling time is 5 min-10 min.

5. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step three, the alkoxysilane coupling agent is γ-methacryloyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a mass ratio of 1-1.1:

1.

6. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step three, the mass ratio of the carbonized mixture to the alkoxysilane coupling agent is 1-1.2:5-8.

7. The method for preparing carbonized fiberglass material as described in claim 1, characterized in that: In step three, the drying temperature is 70℃-90℃, and the drying time is 1h-2h.

8. A carbonized fiberglass material, characterized in that: It is prepared using the preparation method of carbonized fiberglass material according to any one of claims 1-7.

9. A type of cement concrete, characterized in that: Includes the carbonized fiberglass material as described in claim 8.

10. The cement concrete as described in claim 9, characterized in that: The amount of carbonized fiberglass material added is 0.5%-8% of the total mass of cement concrete.

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