High-performance rubber concrete material and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a high-performance rubber concrete material, which comprises the following steps: (1) carrying out ultrasonic treatment on rubber powder, rubber particles, water and tetraethoxysilane, adding a silane coupling agent, continuously carrying out ultrasonic treatment for 30 minutes, drying and sieving to obtain modified rubber powder and modified rubber particles; (2) uniformly mixing calcium fluosilicate, aluminum oxide and magnesium oxide, calcining at high temperature, adding blast furnace slag and silicon powder, and grinding and activating under pressure to obtain a reinforcing agent; and (3) uniformly mixing cement, fly ash and gypsum, adding water, stirring to obtain slurry, adding the modified rubber powder, the modified rubber particles and the reinforcing agent, then adding the functional additive, the short glass fiber and the medium sand, and uniformly mixing to obtain the rubber concrete. The compressive strength of the prepared rubber concrete is 42 MPa or above, the tensile strength ranges from 3.0 MPa to 4.0 MPa, the breaking strength ranges from 5.0 MPa to 6.0 MPa, and application requirements are met.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a high-performance rubber concrete material and a preparation method thereof. Background Art

[0002] With the continuous development of society, more and more waste rubber is produced. Since rubber is difficult to degrade under natural conditions, it has caused serious black pollution and brought great pressure to the environment. If the waste rubber can be crushed and added to concrete as an admixture or aggregate, it can not only alleviate environmental pressure, but also help achieve energy conservation and emission reduction in the construction industry. It is also a practical way to utilize waste rubber resources.

[0003] Rubber concrete is a cement-based composite material made by mixing rubber powder or rubber particles with concrete as the matrix. Ordinary concrete has poor ductility, fatigue resistance, impact resistance and other properties, while rubber has good ductility and toughness. Adding rubber as an aggregate to concrete can better improve the ductility, fatigue resistance, impact resistance and other properties of concrete. Therefore, in recent years, many researchers in the field of civil engineering materials at home and abroad have conducted extensive and in-depth research on rubber concrete and have achieved a lot of research results.

[0004] Chinese patent CN107602145A discloses a high-toughness concrete, the raw materials of which include: gravel, polymer fiber, water-based acrylic acid, elastic rubber particles, cement, sand, fly ash, diluent, gelatin, and since the polymer fiber does not produce a self-assembly effect, the polymer fiber is in a mesh shape, which prevents the sand and stone aggregate from being taken out of the vehicle during driving. Chinese patent CN114773002A discloses a method for preparing a non-autoclaved modified rubber concrete with impact resistance, wherein the raw materials of the concrete include cementitious materials, sand and gravel, rubber fiber, water reducer and water. Chinese patent CN108033740A discloses a high compressive strength rubber aggregate concrete, comprising a concrete base material, rubber aggregate, steel fiber, and a water reducer, wherein the concrete base material comprises nano-silicon dioxide; wherein the concrete base material comprises a cementitious material, gravel, and sand, and the mass ratio thereof is 0.9-1.1:0.6-0.9:1.4-1.8; the cementitious material comprises cement and nano-silicon dioxide, and has good fluidity and water retention performance, saves cement clinker, and has a preparation process Simple, environmentally friendly, and easy to construct; Chinese patent CN112341104A discloses a high-performance road rubber concrete and its preparation method, which is composed of the following raw materials: 340-500 parts of cement, 34-40 parts of fly ash, 600-730 parts of river sand, 40-80 parts of rubber aggregate, 40-80 parts of modified rubber powder, 900-1400 parts of steel slag coarse aggregate, 6-15 parts of water reducer, 3-6 parts of reinforcing additive, and a water-binder ratio of 0.28-0.32. However, the rubber concrete in the prior art still has the defects of low strength, poor durability, insufficient environmental protection, and easy separation of rubber, which seriously restricts its promotion and application. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a method for preparing a rubber concrete material which has excellent mechanical properties, durability, environmental protection and no stratification.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A method for preparing a high-performance rubber concrete material comprises the following steps: (1) ultrasonically treating rubber powder and rubber particles with water and tetraethyl orthosilicate, then adding a silane coupling agent, and then ultrasonically treating for 30 minutes, drying, and sieving to obtain modified rubber powder and modified rubber particles, respectively; (2) First, calcium fluorosilicate, alumina and magnesium oxide are mixed evenly, calcined at high temperature, and then blast furnace slag and silicon powder are added, and the mixture is ground and activated under pressure to obtain a reinforcing agent; (3) Mix cement, fly ash and gypsum evenly, add water and stir to obtain slurry, then add modified rubber powder, modified rubber particles and reinforcing agent, add functional additives, short glass fiber and medium sand, stir and mix thoroughly to obtain rubber concrete.

[0007] In a preferred example, in step (1), the raw materials are calculated by weight: 80 to 120 parts of rubber powder, 80 to 120 parts of rubber particles, 100 to 120 parts of water, 20 to 30 parts of tetraethyl orthosilicate, and 10 to 20 parts of silane coupling agent.

[0008] In a preferred example, in step (1), the weight ratio between the rubber powder and the rubber particles is 1:1.

[0009] In a preferred example, in step (1), the silane coupling agent is selected from methyltriethoxysilane, ethyltriethoxysilane, and isobutyltriethoxysilane.

[0010] In a preferred example, in step (2), the temperature of high temperature calcination is 900° C. to 1100° C., and the time of high temperature calcination is 30 min to 45 min.

[0011] In a preferred example, in step (2), the raw materials for preparing the reinforcing agent are calculated by weight: 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, 20 parts of magnesium oxide, 15 parts of blast furnace slag, and 20 parts of silicon powder. The average particle size of the reinforcing agent is controlled to be 100nm to 200nm.

[0012] In a preferred example, in step (3), the raw materials for preparing the rubber concrete are calculated by weight: 300 to 350 parts of cement, 100 to 150 parts of gypsum, 25 to 35 parts of fly ash, 500 to 600 parts of medium sand, 30 to 40 parts of modified rubber powder, 80 to 100 parts of modified rubber particles, 5 to 10 parts of reinforcing agent, 10 to 15 parts of short glass fiber, and 1 to 5 parts of functional additives; the weight ratio of cement to water is 4 to 5:10.

[0013] In a preferred example, in step (3), the raw materials for preparing the rubber concrete are calculated by weight: 320 parts of cement, 130 parts of gypsum, 30 parts of fly ash, 550 parts of medium sand, 35 parts of modified rubber powder, 90 parts of modified rubber particles, 8 parts of reinforcing agent, 12 parts of short glass fiber, and 3.5 parts of functional additives.

[0014] In a preferred example, in step (3), the functional additive is a mixture of polyacrylamide and polyvinyl alcohol.

[0015] Based on a general inventive concept, another object of the present invention is to provide a high-performance rubber concrete material prepared by the above preparation method.

[0016] The present invention firstly adopts cement, gypsum and fly ash to add water and stir to form a new composite hydrated colloidal slurry, and the functional groups on the surface of modified rubber powder and modified rubber particles are attached to the modified rubber powder and modified rubber particles. The modified rubber powder and modified rubber particles are fully dispersed and suspended in the cement slurry, and the functional additives act synergistically to improve the dispersibility of the modified rubber powder and modified rubber particles in the cement slurry, thereby avoiding the stratification and floating of rubber aggregates, and solving the technical problems of easy separation of rubber powder and rubber particles when floating. In order to further improve the strength of rubber concrete, the present invention develops a self-made reinforcing agent, uses fluorosilicate, aluminum oxide, and magnesium oxide as main raw materials, and undergoes high-temperature calcination and pressure grinding activation. The obtained reinforcing agent modifies the rubber concrete. On the one hand, the consistency of the composite hydrated colloid slurry is improved, and the modified rubber particles, aggregates, fibers and modified rubber powder are tightly connected, and the dispersibility of the modified rubber particles and the modified rubber powder in the cement slurry is further improved, and the floating of the modified rubber particles and the modified rubber powder is inhibited. At the same time, the effective ingredients of the reinforcing agent can react with the free calcium in the concrete to generate a gel substance, thereby increasing the density of the structure, forming a dense and solid entity on the concrete surface, thereby improving the strength, hardness and wear resistance of the concrete surface; on the other hand, the addition of short fibers further ensures the mechanical properties and wear resistance of the rubber modified concrete.

[0017] Compared with the prior art, the process method of the present invention overcomes the limitations and shortcomings of the prior art, can better utilize industrial waste slag, and the obtained rubber concrete has a compressive strength of more than 42MPa, a tensile strength of 3.0MPa-4.0MPa, and a flexural strength of 5.0MPa-6.0MPa, which meets the application requirements. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in conjunction with specific embodiments, but the present invention is not limited to these embodiments. It should be noted that, under the premise of no conflict, the embodiments described below or the technical features can be arbitrarily combined to form new embodiments. In the present invention, unless otherwise specified, the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments, if not otherwise specified, are conventional methods in the art.

[0019] As used herein, the terms "comprises," "including," "contains," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0020] When the amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether this range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in this article, unless otherwise stated, this range is intended to include its end values ​​and all integers and fractions within this range.

[0021] Example 1

[0022] A method for preparing a high-performance rubber concrete material comprises the following steps: (1) ultrasonically treating rubber powder and rubber particles with water and tetraethyl orthosilicate, then adding methyltriethoxysilane, and then ultrasonically treating for 30 minutes, drying, and sieving to obtain modified rubber powder and modified rubber particles, respectively; The raw materials are calculated by weight: 100 parts of rubber powder, 100 parts of rubber particles, 110 parts of water, 25 parts of ethyl orthosilicate, and 15 parts of methyltriethoxysilane; (2) First, calcium fluorosilicate, alumina and magnesium oxide are mixed evenly, calcined at high temperature, and then blast furnace slag and silicon powder are added, and the mixture is ground and activated under pressure to obtain a reinforcing agent; The high-temperature calcination temperature is 1000°C, the high-temperature calcination time is 40 minutes, and the raw materials for preparing the reinforcing agent are calculated by weight: 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, 20 parts of magnesium oxide, 15 parts of blast furnace slag, and 20 parts of silicon powder. The average particle size of the reinforcing agent is controlled to be 200nm; (3) Mix cement, fly ash and gypsum evenly, add water and stir to obtain slurry, then add modified rubber powder, modified rubber particles and reinforcing agent, and then add functional additives, short glass fiber and medium sand, stir thoroughly and mix evenly to obtain rubber concrete; The raw materials for preparing rubber concrete are calculated by weight: 320 parts of cement, 130 parts of gypsum, 30 parts of fly ash, 550 parts of medium sand, 35 parts of modified rubber powder, 90 parts of modified rubber particles, 8 parts of reinforcing agent, 12 parts of short glass fiber, 3.5 parts of functional additives, and 720 parts of water; The functional additive is a mixture of polyacrylamide and polyvinyl alcohol in a weight ratio of 3:2.

[0023] Example 2

[0024] A method for preparing a high-performance rubber concrete material comprises the following steps: (1) ultrasonically treating rubber powder and rubber particles with water and tetraethyl orthosilicate, then adding ethyltriethoxysilane, and then ultrasonically treating for 30 minutes, drying, and sieving to obtain modified rubber powder and modified rubber particles, respectively; The raw materials are calculated by weight: 110 parts of rubber powder, 110 parts of rubber particles, 120 parts of water, 20 parts of tetraethyl orthosilicate, and 20 parts of ethyltriethoxysilane; (2) First, calcium fluorosilicate, alumina and magnesium oxide are mixed evenly, calcined at high temperature, and then blast furnace slag and silicon powder are added, and the mixture is ground and activated under pressure to obtain a reinforcing agent; The high-temperature calcination temperature is 1100°C, the high-temperature calcination time is 30 minutes, and the raw materials for preparing the reinforcing agent are calculated by weight: 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, 20 parts of magnesium oxide, 15 parts of blast furnace slag, and 20 parts of silicon powder. The average particle size of the reinforcing agent is controlled to be 150nm; (3) Mix cement, fly ash and gypsum evenly, add water and stir to obtain slurry, then add modified rubber powder, modified rubber particles and reinforcing agent, and then add functional additives, short glass fiber and medium sand, stir thoroughly and mix evenly to obtain rubber concrete; The raw materials for preparing rubber concrete are calculated by weight: 350 parts of cement, 100 parts of gypsum, 35 parts of fly ash, 500 parts of medium sand, 40 parts of modified rubber powder, 80 parts of modified rubber particles, 10 parts of reinforcing agent, 10 parts of short glass fiber, 5 parts of functional additives, and 875 parts of water; The functional additive is a mixture of polyacrylamide and polyvinyl alcohol in a weight ratio of 2:1.

[0025] Example 3

[0026] A method for preparing a high-performance rubber concrete material comprises the following steps: (1) ultrasonically treating rubber powder and rubber particles with water and tetraethyl orthosilicate, then adding isobutyltriethoxysilane, and then ultrasonically treating for 30 minutes, drying, and sieving to obtain modified rubber powder and modified rubber particles, respectively; The raw materials are calculated by weight: 80 parts of rubber powder, 80 parts of rubber particles, 100 parts of water, 30 parts of tetraethyl orthosilicate, and 10 parts of isobutyltriethoxysilane; (2) First, calcium fluorosilicate, alumina and magnesium oxide are mixed evenly, calcined at high temperature, and then blast furnace slag and silicon powder are added, and the mixture is ground and activated under pressure to obtain a reinforcing agent; The high-temperature calcination temperature is 900°C, the high-temperature calcination time is 45 minutes, and the raw materials for preparing the reinforcing agent are calculated by weight: 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, 20 parts of magnesium oxide, 15 parts of blast furnace slag, and 20 parts of silicon powder. The average particle size of the reinforcing agent is controlled to be 100 nm; (3) Mix cement, fly ash and gypsum evenly, add water and stir to obtain slurry, then add modified rubber powder, modified rubber particles and reinforcing agent, and then add functional additives, short glass fiber and medium sand, stir thoroughly and mix evenly to obtain rubber concrete; The raw materials for preparing rubber concrete are calculated by weight: 300 parts of cement, 150 parts of gypsum, 25 parts of fly ash, 600 parts of medium sand, 30 parts of modified rubber powder, 100 parts of modified rubber particles, 5 parts of reinforcing agent, 15 parts of short glass fiber, 1 part of functional additive, and 600 parts of water; The functional additive is a mixture of polyacrylamide and polyvinyl alcohol in a weight ratio of 2:3.

[0027] Comparative Example 1

[0028] A method for preparing a rubber concrete material comprises the following steps: Take 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, and 20 parts of magnesium oxide, mix them evenly, calcine them at 900°C for 40 minutes, then add 15 parts of blast furnace slag and 20 parts of silicon powder, grind and activate them under pressure to obtain a reinforcing agent with a particle size of 150nm; (2) Take 320 parts of cement, 30 parts of fly ash, and 130 parts of gypsum, mix them evenly, then add 720 parts of water, stir to obtain a slurry, then add 35 parts of rubber powder and 90 parts of rubber particles and 8 parts of the reinforcing agent prepared in step (1), and finally add 3.5 parts of functional additive (polyacrylamide), 12 parts of short glass fiber and 550 parts of medium sand, stir well and mix evenly to obtain rubber concrete.

[0029] Comparative Example 2

[0030] A method for preparing a rubber concrete material comprises the following steps: (1) 100 parts of rubber powder and 100 parts of rubber particles were ultrasonically treated with 110 parts of water and 25 parts of tetraethyl orthosilicate, and then 15 parts of methyltriethoxysilane were added, and the ultrasonic treatment was continued for 30 minutes, and the mixture was dried and sieved to obtain modified rubber powder and modified rubber particles, respectively; (2) Take 320 parts of cement, 130 parts of gypsum, and 30 parts of fly ash, mix them evenly, add 720 parts of water, stir to obtain slurry, then add 35 parts of modified rubber powder, 90 parts of modified rubber particles, and finally add 3.5 parts of functional additive (polyacrylamide), 12 parts of short glass fiber and 550 parts of medium sand, stir thoroughly, mix evenly, and obtain rubber concrete.

[0031] Comparative Example 3

[0032] A method for preparing a rubber concrete material comprises the following steps: Take 320 parts of cement, 130 parts of gypsum, and 30 parts of fly ash, mix them evenly, add 720 parts of water, stir to obtain slurry, then add 35 parts of rubber powder, 90 parts of rubber particles, and finally add 3.5 parts of functional additives (polyacrylamide), 12 parts of short glass fiber and 550 parts of medium sand, stir and mix thoroughly to obtain rubber concrete.

[0033] The rubber concrete materials prepared in the above Examples 1 to 3 and Comparative Examples 1 to 3 were tested for 28d performance indicators according to GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", GB / T 50080-2002 "Concrete Slump Test Method", and GB / T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", as shown in the following table: Table 1 Performance test results of rubber concrete materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3 project Compressive strength (MPa) Splitting tensile strength (MPa) Flexural strength (MPa) <![CDATA[Shrinkage rate (10 -6 ).]]> Carbonization depth (mm) Example 1 43.1 3.85 5.71 168 0.53 Example 3 42.8 3.78 5.62 165 0.58 Example 2 42.3 3.61 5.47 170 0.55 Comparative Example 1 32.5 3.21 4.46 210 0.60 Comparative Example 2 30.1 3.09 4.84 221 0.65 Comparative Example 3 28.9 2.68 4.78 238 0.62 It can be seen from the above test results that the 28-day compressive strength, tensile strength and flexural strength of the rubber concrete material prepared by the method of the present invention are significantly higher than those of the prior art, and the durability is better than that of the conventional technology.

[0034] The above embodiments are merely preferred implementations of the present invention. Any simple modification, amendment and substitution of the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-performance rubber concrete material, It is characterized in that The following steps are involved: (1) ultrasonically treating rubber powder and rubber particles with water and tetraethyl orthosilicate, then adding a silane coupling agent, and then ultrasonically treating for 30 minutes, drying, and sieving to obtain modified rubber powder and modified rubber particles, respectively; (2) First, calcium fluorosilicate, alumina and magnesium oxide are mixed evenly, calcined at high temperature, and then blast furnace slag and silicon powder are added, and the mixture is ground and activated under pressure to obtain a reinforcing agent; (3) Mix cement, fly ash and gypsum evenly, add water and stir to obtain slurry, then add modified rubber powder, modified rubber particles and reinforcing agent, add functional additives, short glass fiber and medium sand, stir and mix thoroughly to obtain rubber concrete.

2. A method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that Step (1), the raw materials are calculated by weight: 80 to 120 parts of rubber powder, 80 to 120 parts of rubber particles, 100 to 120 parts of water, 20 to 30 parts of tetraethyl orthosilicate, and 10 to 20 parts of silane coupling agent.

3. A method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that In step (1), the weight ratio between the rubber powder and the rubber particles is 1:

1.

4. The method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that In step (1), the silane coupling agent is selected from methyltriethoxysilane, ethyltriethoxysilane, and isobutyltriethoxysilane.

5. The method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that In step (2), the temperature of high temperature calcination is 900° C. to 1100° C., and the time of high temperature calcination is 30 min to 45 min.

6. The method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that Step (2), the raw materials for preparing the reinforcing agent are calculated by weight: 10 parts of calcium fluorosilicate, 30 parts of aluminum oxide, 20 parts of magnesium oxide, 15 parts of blast furnace slag, and 20 parts of silicon powder. The average particle size of the reinforcing agent is controlled to be 100nm to 200nm.

7. The method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that Step (3), the raw materials for preparing the rubber concrete are calculated by weight: 300 to 350 parts of cement, 100 to 150 parts of gypsum, 25 to 35 parts of fly ash, 500 to 600 parts of medium sand, 30 to 40 parts of modified rubber powder, 80 to 100 parts of modified rubber particles, 5 to 10 parts of reinforcing agent, 10 to 15 parts of short glass fiber, and 1 to 5 parts of functional additives; The weight ratio of cement to water is 4-5:

10.

8. A method for preparing a high-performance rubber concrete material according to claim 7, It is characterized in that Step (3), the raw materials for preparing the rubber concrete are calculated by weight: 320 parts of cement, 130 parts of gypsum, 30 parts of fly ash, 550 parts of medium sand, 35 parts of modified rubber powder, 90 parts of modified rubber particles, 8 parts of reinforcing agent, 12 parts of short glass fiber, and 3.5 parts of functional additives.

9. The method for preparing a high-performance rubber concrete material according to claim 1, It is characterized in that In step (3), the functional additive is a mixture of polyacrylamide and polyvinyl alcohol.

10. A high-performance rubber concrete material prepared by the preparation method according to any one of claims 1 to 9.