Concrete self-reinforced particles based on microwave induction as well as preparation method and application of concrete self-reinforced particles
The gelling component reaction is stimulated in the late hydration stage by microwave-induced concrete self-reinforced particles, which solves the problem of underutilizing the activity of solid waste gelling materials and improves the mechanical properties of concrete.
Patent Information
- Application Number
- CN202510553853.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2025-08-05
AI Technical Summary
In the prior art, the active ingredients of high-volume solid waste gelling materials are not fully stimulated in the later stage of concrete hydration, resulting in limited performance improvement, and commonly used excitants may cause problems such as pro-coagulation and self-contraction of cement slurry.
Microwave-induced concrete self-reinforced particles are used to apply microwave signals in the later stage of concrete hydration, and the excitant and gelling components in the particles are released for secondary hydration. The microwave response layer composed of paraffin and iron tetraoxide powder is used to prevent the excitant reaction in the early stage of hydration, and the reaction rate is accelerated later.
The flexural compressive strength and compactness of concrete are improved and the performance of concrete is improved.
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Figure CN120423809A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of civil engineering materials, and in particular to microwave-induced concrete self-reinforced particles, a preparation method and applications thereof. Background Art
[0002] With the continuous advancement of the low-carbon transformation of the concrete industry, the proportion of solid waste cementitious materials (SCM) with a low carbon footprint in concrete is increasing, and its dosage can even reach 75%. With such a large dosage, there may still be a large number of active components that have not been effectively activated in the late stage of hydration in the concrete, which is not conducive to the effective utilization of solid waste. To this end, the common practice is to use chemical means such as activators to more fully utilize the activity of solid waste cementitious materials SCM in the early stage of hydration. However, these activators are usually added to the mixture during molding, which usually brings about problems such as accelerated coagulation of cement paste and increased shrinkage. Therefore, the dosage of activator should not be too high, which makes the reaction degree of the added solid waste cementitious components low.
[0003] Due to their rapid, targeted heating and ability to propagate through the concrete matrix, microwaves can be used as an excellent controlled-release excitation signal, enabling the active release of admixtures from concrete. Researchers at home and abroad have conducted a wealth of inspiring work in diverse fields, including 3D printing, rust prevention, and self-repair. However, the difficulty in effectively improving concrete properties in the later stages of hydration remains a challenge. Summary of the Invention
[0004] The present invention is made to solve the above problems, and aims to provide a concrete self-reinforcing particle based on microwave induction, a preparation method and application thereof.
[0005] The present invention provides a preparation method of concrete self-reinforced particles based on microwave induction, which has the following characteristics and comprises the following steps: S1, weighing ceramsite and preparing an activator solution for use, wherein the mass ratio of the ceramsite to the activator solution is 4:5; S2, evacuating a container containing the activator solution through a vacuum dryer; S3, opening a valve of the vacuum dryer, introducing the prepared activator solution into the device until all the ceramsite is immersed, maintaining a vacuum state of -0.1 MPa for 1 hour, then opening the air valve of the vacuum dryer, and allowing the solution to stand for adsorption for 1 to 3 days; S4, filtering the ceramsite, spreading it flat in a container, and drying it naturally at room temperature. 12h until the saturated surface is dry for use to obtain dried ceramsite; S5, weighing paraffin wax and ferroferric oxide powder, the mass ratio of the paraffin wax to the ferroferric oxide powder is 24:1, heating the paraffin wax to 80-90°C to obtain molten paraffin, adding the ferroferric oxide powder to the molten paraffin and stirring for 0.5-1.5min; S6, weighing the dried ceramsite and paraffin wax according to a mass ratio of 1:2, adding the dried ceramsite to the paraffin, and heating in an oven at 105°C for 3-7min; S7, filtering out excess molten paraffin, putting it into a container filled with cement, shaking it left and right for 1-2min to wrap a layer of cement, and obtaining concrete self-reinforcing particles.
[0006] In the preparation method of microwave-induced concrete self-reinforcing particles provided by the present invention, it can also have the following characteristics: wherein the ceramsite is expanded clay ceramsite with a particle size of 3-5 mm, and the activator solution is one of a 20wt% sodium carbonate solution, a 20wt% sodium silicate solution with a modulus of 1, and a 20wt% sodium hydroxide solution.
[0007] The method for preparing microwave-induced concrete self-reinforcing particles provided by the present invention may also have the following characteristics: wherein, step S2 specifically includes the following sub-steps: using a vacuum drying dish, connecting one end to a vacuum pump and the other end to a container containing an activator, and performing a vacuum operation.
[0008] The method for preparing microwave-induced concrete self-reinforced particles provided by the present invention may also have the following characteristics: the paraffin wax is sliced paraffin wax with a melting point of 58° C., and the particle size of the ferrosoferric oxide powder is 5-100 nm.
[0009] The present invention also provides a microwave-induced concrete self-reinforcing particle having the following characteristics: the particle is prepared by the above-mentioned method for preparing the microwave-induced concrete self-reinforcing particle.
[0010] The microwave-induced concrete self-reinforcing particles provided by the present invention may also have the following characteristics: the concrete self-reinforcing particles include a capsule core and a capsule wall.
[0011] The microwave-induced concrete self-reinforced particles provided by the present invention may also have the following characteristics: the capsule core includes a skeleton and an adsorption activator, the skeleton is porous ceramsite, the porous ceramsite is expanded clay ceramsite with a particle size of 3-5 mm, and the particle size of the capsule core is 3-5 mm.
[0012] The microwave-induced concrete self-reinforcing particles provided by the present invention may also have the following characteristics: the capsule wall includes a microwave-induced layer and an outer shell layer, the outer shell layer is wrapped around the outside of the microwave-induced layer, the microwave-induced layer is paraffin mixed with ferrosoferric oxide, and the outer shell layer is a layer of cement.
[0013] The present invention also provides an application of microwave-induced concrete self-reinforcing particles in improving concrete performance, which has the following characteristics: concrete self-reinforcing particles are used to replace part of river sand, cement, water, river sand and concrete self-reinforcing particles are mixed, and microwave-induced self-reinforced concrete is prepared by microwave induction, thereby stimulating the reaction activity of the cementitious components in the concrete and achieving improvement in concrete performance.
[0014] Functions and effects of the invention
[0015] According to the microwave-induced concrete self-reinforcing particles, preparation methods, and applications thereof, the microwave-induced concrete self-reinforcing particles of the present invention can be added to concrete and, after a microwave-induced signal is applied in the late stage of concrete hydration, the particles release the activator contained in the particles to undergo secondary hydration with the cementitious components in the concrete, thereby stimulating the activity of the cementitious components in the concrete. A microwave-responsive layer composed of paraffin wax and ferroferric oxide powder can prevent the activator from reacting with the slurry in the early stage of hydration, and, after the microwave signal is applied, releases the activator to react with the cementitious components to produce reaction products such as calcium carbonate and accelerate the reaction rate of the cementitious components, thereby improving the flexural and compressive strength, density, and other indicators of the concrete matrix. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the structure of concrete self-reinforced particles based on microwave induction in an embodiment of the present invention;
[0017] Figure 2 The flexural strength test results of Example 1, Example 2 and Comparative Example 1 in the embodiments of the present invention are as follows;
[0018] Figure 3 The compressive strength test results of Example 1, Example 2 and Comparative Example 1 in the embodiments of the present invention are as follows;
[0019] Figure 4 are the flexural strength test results of Examples 3 and 4 and Comparative Example 2 in the embodiments of the present invention; and
[0020] Figure 5 These are the compressive strength test results of Example 3 and Example 4 and Comparative Example 2 in the embodiments of the present invention. DETAILED DESCRIPTION
[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the following examples and accompanying drawings specifically illustrate the microwave-induced concrete self-reinforcing particles, preparation methods and applications of the present invention.
[0022] Example 1
[0023] Figure 1 Schematic diagram of the structure of microwave-induced concrete self-reinforced particles in an embodiment of the present invention.
[0024] like Figure 1 As shown, the method for preparing concrete self-reinforcing particles based on microwave induction in this embodiment includes the following steps:
[0025] S1, according to the mass ratio of 4:5, 600g of ceramsite and 750g of activator solution are prepared for use.
[0026] The ceramsite is expanded clay ceramsite with a particle size of 3-5 mm, and the activator is a 20 wt % sodium silicate solution with a modulus of 1.
[0027] S2. Use a vacuum drying dish, connect one end to a vacuum pump and the other end to a container containing the stimulant, and perform a vacuum operation to evacuate the container containing the stimulant solution. When the vacuum degree of the vacuum dryer reaches -0.1 MPa, maintain it for 10 minutes.
[0028] S3, open the valve of the vacuum dryer and introduce the prepared activator solution into the device until all the ceramsite is immersed. After maintaining the vacuum state of -0.1MPa for 1 hour, open the air valve of the vacuum dryer and let it stand for adsorption for 2 days.
[0029] S4, filtering the ceramsite, spreading it in a container and drying it naturally at room temperature for 12 hours until the saturated surface is dry, to obtain dried ceramsite.
[0030] S5. Weigh 192 g of paraffin wax and 8 g of ferroferric oxide powder in a mass ratio of 24:1. Heat the paraffin wax to 85°C to obtain molten paraffin. Add the ferroferric oxide powder to the molten paraffin and stir for 1 min.
[0031] S6, weigh 100g of dried ceramsite, add it to molten paraffin, and heat it in a 105℃ oven for 5min.
[0032] S7, filter out excess molten paraffin, put it into a container filled with cement, shake it left and right for 1 minute to coat it with a layer of cement, and obtain concrete self-reinforcing particles.
[0033] In this embodiment, the steps for preparing microwave-induced self-reinforced concrete using concrete self-reinforced particles are as follows:
[0034] (1) Cement, water, river sand, and microwave-induced concrete self-reinforcing particles were mixed to prepare microwave-induced self-reinforcing concrete. The mass of microwave-induced concrete self-reinforcing particles was 2% of the volume of river sand. The water-cement ratio in the cement mortar was 0.5, and the cement-sand ratio was 1:3.
[0035] (2) After the cement mortar was cured at 100% humidity and 25°C for 6 days, it was microwave treated.
[0036] (3) The frequency of microwave treatment is 2.4 GHz, the power is 720 °C, and the treatment time is 1 min.
[0037] (4) The obtained cement mortar is further cured at 100% humidity and 25° C. until the age of 28 days.
[0038] Example 2
[0039] Compared with Example 1, in this example, the "microwave-induced concrete self-reinforcing particles are added in an amount of 2% by mass of the river sand" in step (1) is replaced by "the microwave-induced concrete self-reinforcing particles are added in an amount of 4% by mass of the river sand".
[0040] For the sake of convenience, the structures in this embodiment that are the same as those in the first embodiment will not be described in detail.
[0041] Example 3
[0042] Compared with Example 1, in this embodiment, the "activator is a 20wt% sodium silicate solution with a modulus of 1" in step S1 is replaced by "the activator is a 20wt% sodium hydroxide solution", and step (1) is replaced by "mixing cement, water, river sand, and microwave-induced concrete self-reinforcing particles to prepare microwave-induced self-reinforced concrete, the amount of microwave-induced concrete self-reinforcing particles is 2% of the volume of river sand, the water-cement ratio in the cement mortar is 0.5, the cement-slag ratio is 7:3, and the mortar-sand ratio is 1:3".
[0043] For the sake of convenience, the structures in this embodiment that are the same as those in the first embodiment will not be described in detail.
[0044] Example 4
[0045] Compared with Example 3, in this example, “the mass of the microwave-induced self-reinforcing concrete particles is 2% of the volume of the river sand” is replaced by “the mass of the microwave-induced self-reinforcing concrete particles is 4% of the mass of the river sand”.
[0046] For the sake of convenience, the structures in this embodiment that are the same as those in the third embodiment will not be described in detail.
[0047] Comparative Example 1
[0048] Compared with Example 1, in this comparative example, the step of preparing microwave-induced self-reinforced concrete using concrete self-reinforced particles is replaced by "preparing a cement mortar without microwave-induced concrete self-reinforced particles having a water-cement ratio of 0.5 and a cement-sand ratio of 1:3, and curing the mortar under 100% humidity and 25°C for 28 days."
[0049] Comparative Example 2
[0050] Compared with Example 1, in this comparative example, the step of preparing microwave-induced self-reinforced concrete using concrete self-reinforced particles is replaced by "preparing a slag-containing mortar without microwave-induced concrete self-reinforced particles having a water-binder ratio of 0.5, a cement-slag ratio of 7:3, and a mortar-sand ratio of 1:3, and curing the mortar under conditions of 100% humidity and 25°C to an age of 28 days."
[0051] Figure 2 These are the flexural strength test results of Example 1, Example 2 and Comparative Example 1 in the embodiments of the present invention. Figure 3 These are the compressive strength test results of Example 1, Example 2 and Comparative Example 1 in the embodiments of the present invention.
[0052] like Figure 2-3 As shown, the flexural and compressive strength tests were carried out using a universal testing instrument. The results showed that the flexural and compressive strengths of the mortars of Examples 1-2 were significantly improved compared to those of Comparative Example 1.
[0053] Figure 4 These are the flexural strength test results of Example 3 and Example 4 and Comparative Example 2 in the embodiments of the present invention. Figure 5 These are the compressive strength test results of Example 3 and Example 4 and Comparative Example 2 in the embodiments of the present invention.
[0054] Figure 4-5 These are the flexural and compressive strength test results of Example 3 and Example 4 and Comparative Example 2 in the embodiments of the present invention.
[0055] like Figure 4-5 As shown, the flexural and compressive strength tests were carried out using a universal testing instrument. The results showed that the flexural and compressive strengths of the mortars of Examples 3-4 were significantly improved compared to that of Comparative Example 2.
[0056] The microwave-induced concrete self-reinforcement particles of the present invention can stimulate the reaction activity of the gelling components in the concrete, thereby improving the performance of the concrete.
[0057] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for preparing concrete self-reinforced particles based on microwave induction, characterized in that: The steps include: S1, weighing ceramsite and preparing an activator solution for use, wherein the mass ratio of the ceramsite to the activator solution is 4:5; S2, evacuating the container containing the stimulator solution through a vacuum dryer; S3, opening the valve of the vacuum dryer, introducing the prepared activator solution into the device until all the ceramsite is immersed, maintaining the vacuum state of -0.1 MPa for another hour, then opening the air valve of the vacuum dryer and allowing it to stand for adsorption for 1 to 3 days; S4, filtering the ceramsite, spreading it in a container and drying it naturally at room temperature for 12 hours until the saturated surface is dry for use, to obtain dried ceramsite; S5, weighing paraffin wax and ferroferric oxide powder, wherein the mass ratio of the paraffin wax to the ferroferric oxide powder is 24:1, heating the paraffin wax to 80-90° C. to obtain molten paraffin wax, and adding the ferroferric oxide powder to the molten paraffin wax and stirring for 0.5-1.5 minutes; S6, weighing the dried ceramsite and paraffin wax in a mass ratio of 1:2, adding the dried ceramsite to the paraffin wax, and heating in an oven at 105° C. for 3 to 7 minutes; S7, filtering out excess molten paraffin, placing the molten paraffin into a container filled with cement, and shaking it left and right for 1 to 2 minutes to coat a layer of cement, thereby obtaining concrete self-reinforcing particles.
2. The method for preparing microwave-induced concrete self-reinforced particles according to claim 1, characterized in that: in, The ceramsite is expanded clay ceramsite with a particle size of 3-5 mm, and the activator solution is one of a 20 wt% sodium carbonate solution, a 20 wt% sodium silicate solution with a modulus of 1, and a 20 wt% sodium hydroxide solution.
3. The method for preparing microwave-induced concrete self-reinforced particles according to claim 1, characterized in that: in, Step S2 specifically includes the following sub-steps: using a vacuum drying dish, connecting one end to a vacuum pump and the other end to a container containing an exciter, and performing a vacuum operation.
4. The method for preparing microwave-induced concrete self-reinforced particles according to claim 1, characterized in that: in, The paraffin wax is sliced paraffin wax with a melting point of 58° C., and the particle size of the ferrosoferric oxide powder is 5-100 nm.
5. A microwave-induced concrete self-reinforced particle, characterized by: The concrete self-reinforcing particles are prepared by the method for preparing concrete self-reinforcing particles based on microwave induction according to any one of claims 1 to 4.
6. The microwave-induced concrete self-reinforcement particles according to claim 5, characterized in that: in, The concrete self-reinforcing particles include a capsule core and a capsule wall.
7. The microwave-induced concrete self-reinforcement particles according to claim 6, characterized in that: in, The capsule core comprises a skeleton and an adsorption activator. The skeleton is porous ceramsite, the porous ceramsite is expanded clay ceramsite with a particle size of 3-5 mm, and the particle size of the capsule core is 3-5 mm.
8. The microwave-induced concrete self-reinforcement particles according to claim 6, characterized in that: in, The capsule wall comprises a microwave induction layer and an outer shell layer, wherein the outer shell layer is wrapped around the outside of the microwave induction layer, the microwave induction layer is paraffin mixed with ferrosoferric oxide, and the outer shell layer is a layer of cement.
9. Use of microwave-induced concrete self-reinforced particles in improving concrete properties according to any one of claims 5 to 8, characterized in that: The concrete self-reinforcing particles are used to replace part of the river sand, and cement, water, river sand and the concrete self-reinforcing particles are mixed. Microwave-induced self-reinforced concrete is prepared by microwave induction, which stimulates the reaction activity of the cementitious components in the concrete and improves the performance of the concrete.