Low-frequency damping metamaterial concrete based on industrial solid waste and preparation application

Abstract

The application discloses a kind of low-frequency damping metamaterial concrete based on industrial solid waste and preparation application, it is a kind of low-carbon concrete material with low-frequency damping function, including cement mortar, and multiple particle size local resonance artificial aggregate randomly distributed in cement mortar.The local resonance artificial aggregate is metallurgical waste steel slag with particle size range 4.75-31.5mm and continuous gradation, and the outer package waste tire rubber is formed into concrete material after mixing and pouring with cement mortar, and the thickness of the wrapping layer is 5-10mm.The multiple particle size local resonance artificial aggregate composed of steel slag and waste rubber will produce negative mass density characteristics under low-frequency dynamic load excitation, and form multiple low-frequency band gaps below 100Hz to attenuate the stress wave intensity transmitted in concrete.The application uses industrial solid waste to prepare local resonance artificial aggregate, which can realize concrete damping under low-frequency dynamic load such as earthquake and traffic, and high-value utilization of industrial solid waste.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a low-frequency damping metamaterial concrete based on industrial solid waste and a preparation and application thereof. BACKGROUND

[0002] With the rapid development of industrial technology in China, a large amount of industrial solid waste has been generated and accumulated in the process. Among them, the smelting industry, as a national economic pillar industry, produces a large amount of steel slag in the production process. The current inventory is nearly 1 billion tons, and the annual increment is 100 million tons. At the same time, China is a big country of automobile industry, and the consumption of tires is increasing year by year. The annual output of waste tires is nearly 400 million. Due to the continuous growth of industrial solid waste production and the low recovery and processing efficiency, the large accumulation of industrial solid waste that has not been properly treated will cause environmental problems such as soil, water and air pollution, which poses a great threat to the sustainable development of China's ecological environment.

[0003] At the same time, as the most important building material, the carbon emissions generated in the preparation process of concrete account for a high proportion in the whole life cycle of building. The use of industrial solid waste to prepare artificial aggregate will help to reduce the carbon emissions in the production of aggregate and cement, and alleviate the pressure of natural aggregate resources and the harm of industrial solid waste accumulation. In the prior art, the metamaterial concrete is a new type of concrete material with filtering and damping effect. The local resonance artificial aggregate composed of elastic coating wrapped around heavy core with high density is used to replace ordinary sand and stone coarse aggregate. The local resonance artificial aggregate can produce wave band gap under dynamic load to attenuate vibration transmission in a specific frequency band, which can provide technical support for the vibration control of buildings, bridges and other major civil infrastructure.

[0004] However, in the existing technical scheme for preparing metamaterial concrete, the core of the local resonance artificial aggregate often uses high-density metal materials such as lead and steel, and the elastic coating is made of silicone rubber and natural rubber. Compared with traditional natural coarse aggregate, the economic cost and carbon emissions are at a high level. At the same time, the structural parameters of the local resonance artificial aggregate are relatively single, and the start and end frequencies of the opened band gap are high. The local resonance artificial aggregate is mainly applied to the damping and cracking of high-frequency impact load, and the control effect of low-frequency dynamic load caused by traffic and earthquake is limited. Therefore, how to use industrial solid waste to prepare metamaterial concrete with low-frequency damping effect and effectively reduce the economic production cost and carbon emissions is a technical problem that needs to be solved for popularizing metamaterial concrete to the field of civil infrastructure. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a low-frequency damping metamaterial concrete based on industrial solid waste and a preparation and application thereof, wherein artificial local resonance aggregates composed of steel slag with different particle sizes and waste tire rubber are applied to the metamaterial concrete, a suitable aggregate grading curve is designed to open a low-frequency filter band gap, and the material cost and carbon emissions during production are reduced.

[0006] To this end, the present application adopts the following technical solutions:

[0007] A low-frequency damping metamaterial concrete based on industrial solid waste, the low-frequency damping metamaterial concrete comprising: cement mortar and local resonance artificial aggregate; the local resonance artificial aggregate being composed of steel slag heavy core coated with waste rubber elastic coating.

[0008] The material of the steel slag heavy core comprises one or more of converter slag (BFS), electric furnace slag (EAFS), casting residue (CRS) and stainless steel slag (SSS), and the apparent density is not less than 3000 kg / m 3 .

[0009] The optional range of the waste rubber elastic coating comprises waste car tires, waste bus tires and waste truck tires.

[0010] The particle size of the steel slag heavy core is 4.75-31.5 mm, and the grading is continuous; the particle size of the waste tire rubber is not greater than 3 mm, and the thickness of the rubber elastic coating is 5-10 mm.

[0011] The cement mortar is prepared from Portland cement, water, fine aggregate and water reducing agent.

[0012] The preparation method of the metamaterial concrete comprises the following steps:

[0013] First step: selecting steel slag with a particle size range of 4.75-31.5 mm and continuous grading as the aggregate core;

[0014] Second step: selecting waste tires, obtaining purified waste rubber particles after a normal temperature crushing process, uniformly wrapping the waste rubber particles on the surface of the steel slag with an adhesive, and curing the elastic coating after heating and pressurizing to form an elastic coating, so that the steel slag heavy core and the outer waste rubber elastic coating together constitute a local resonance artificial aggregate;

[0015] Third step: preparing cement mortar, putting the local resonance artificial aggregate prepared in the second step into the cement mortar and stirring and vibrating uniformly to make the cement mortar completely wrap the local resonance artificial aggregate.

[0016] The adhesive is one of epoxy resin, polyurethane and silicone rubber adhesive.

[0017] The application of the super material concrete, the concrete material is reinforced or combined with steel material to form a combined component, and a structural component with low frequency filtering function is made.

[0018] From the above disclosed technical solutions, compared with the prior art, the beneficial effects of the present application are as follows:

[0019] The present application uses bulk industrial solid waste steel slag and waste tires as raw materials, designs artificial aggregates with local resonance effect, adds them to cement mortar to form super material concrete with filtering and vibration reduction function. Thus, low frequency vibration below 100Hz caused by earthquakes, traffic and other factors is attenuated and controlled. However, in terms of economic cost, the price of steel slag is only about 200 yuan / ton, and the price of waste tires is about 700 yuan / ton, while the price of commonly used heavy nuclear material steel and lead in existing super material concrete is about 5000 yuan / ton and 20000 yuan / ton respectively, and the price of commonly used elastic coating material polyurethane, silicone rubber and epoxy resin is about 20000 yuan / ton, 30000 yuan / ton and 30000 yuan / ton respectively, the raw material cost is significantly reduced. At the same time, since the local resonance artificial aggregate is prepared from industrial solid waste and the secondary treatment process is simple, compared with ordinary concrete, the carbon emission can be reduced by more than 20%, and compared with the super material concrete commonly using steel balls as heavy nuclear material, the carbon emission can be reduced by more than 50%. Therefore, the super material concrete based on industrial solid waste has better sustainability and lower economic cost, and has good application prospect in the field of low frequency vibration reduction. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole schematic view of the super material concrete component based on industrial solid waste.

[0021] Figure 2 It is a schematic view of the local resonance artificial aggregate.

[0022] In the figure, 1 is cement mortar; 2 is artificial aggregate; 3 is elastic wrapping layer; 4 is steel slag heavy core. DETAILED DESCRIPTION

[0023] The specific implementation method of the technical solutions provided by the present application will be further described below in combination with the drawings. It should be understood that the specific examples described herein are only used to illustrate the present application in detail, and are not used to limit the present application.

[0024] As shown in Figure 1 , Figure 2 A super material concrete based on industrial solid waste, including cement mortar 1 and local resonance artificial aggregate 2 randomly distributed in the cement mortar, the artificial aggregate 2 is composed of steel slag heavy core 4 and elastic coating layer 3 composed of waste rubber elastic coating layer.

[0025] In this embodiment, the steel slag is converter steel slag, the particle size range is 5-31.5mm, and the gradation is continuous, and the proportion of each particle size is: 5.5% (0-5mm), 26.5% (5-9.5mm), 35% (9.5-19mm), 33% (19-31.5mm), and the apparent density of the steel slag is 3560kg / m 3 .

[0026] In this embodiment, the waste tire is a waste automobile tire, and a normal temperature crushing process is adopted, and the waste tire is sequentially crushed and purified through a double-shaft shredder, a medium crusher, a fine crusher, a magnetic separator and a fiber separator, so that the waste tire is crushed and purified, and waste rubber particles with a particle size of 1-2mm are obtained.

[0027] In this embodiment, the rubber adhesive is a two-component polyurethane adhesive.

[0028] The example of the present application provides a preparation method of metamaterial concrete based on industrial solid waste, comprising the following steps:

[0029] Step 1: select converter steel slag, the particle size range is 5-31.5mm, and the aggregate gradation is continuous;

[0030] Step 2: select waste automobile tires, and obtain purified rubber particles with a particle size range of 1-2mm through a normal temperature crushing process, and the waste rubber particles and the two-component polyurethane adhesive are mixed and uniformly wrapped on the outer layer of the steel slag aggregate, and the thickness of the wrapping layer is 6-8mm;

[0031] Step 3: place the steel slag coated with waste rubber particles in a forming mold, and use a hot press to heat and press the mold, and the processing conditions are pressure 10.2MPa and temperature 140℃, so that the waste rubber particles are rapidly solidified and formed on the surface of the steel slag, and a local resonance artificial aggregate is formed, as shown in Figure 2 , wherein the waste rubber elastic wrapping layer 3 formed by hot pressing wraps the steel slag heavy nucleus 4.

[0032] Step 4: prepare cement mortar, mix the local resonance artificial aggregate obtained in step 3 with the cement mortar, and vibrate and compact to form metamaterial concrete with vibration reduction effect.

[0033] The technical features of the above embodiments can be further combined. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0034] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and all belong to the protection scope of the present application. The protection scope of the present application is given by the appended claims and any equivalent technical solutions thereof.

Claims

1. A low frequency vibration damping metamaterial concrete based on industrial solid waste, characterized in that, The low-frequency damping metamaterial concrete comprises cement mortar and local resonance artificial aggregate; the local resonance artificial aggregate is composed of steel slag heavy core coated with waste rubber elastic coating; The steel slag heavy nuclear material includes one or more of converter slag, electric furnace slag, casting residue, stainless steel slag, and the apparent density is not less than 3000kg / m 3 ; The waste rubber elastic coating can be selected from waste car tires, waste bus tires and waste truck tires; The steel slag heavy core has a particle size of 4.75-31.5 mm and a continuous grading; the waste tire rubber particles have a particle size of not more than 3 mm, and the rubber elastic coating has a thickness of 5-10 mm; the low-frequency vibration below 100 Hz is attenuated and controlled.

2. The metamaterial concrete of claim 1, wherein, The cement mortar is prepared from Portland cement, water, fine aggregate and water reducing agent.

3. The method of claim 1, wherein the metamaterial concrete is prepared by mixing the conductive material, the dielectric material, and the binder. The method comprises the following steps: Step 1: selecting steel slag with a particle size of 4.75-31.5 mm and a continuous grading as the aggregate core; Step 2: selecting waste tires, obtaining purified waste rubber particles through normal-temperature crushing process, uniformly coating the waste rubber particles on the surface of the steel slag with an adhesive, solidifying the elastic coating through heating and pressurizing, and jointly forming the local resonance artificial aggregate with the steel slag heavy core and the outer waste rubber elastic coating; Step 3: preparing cement mortar, stirring and vibrating the local resonance artificial aggregate prepared in Step 2 in the cement mortar until the cement mortar completely coats the local resonance artificial aggregate.

4. The method of claim 3, wherein the super material concrete is prepared by mixing the super material powder and the cement, and then adding the water. The adhesive is one of epoxy resin, polyurethane and silicone rubber adhesive.

5. Use of metamaterial concrete according to claim 1, characterized in that, The concrete material is combined with steel material to form a combined component, and a structural component with low-frequency filtering function is prepared.

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