Modified rubber concrete and preparation method thereof

Abstract

The invention discloses modified rubber concrete and a preparation method thereof. The invention relates to a flame-retardant concrete which is prepared from the following raw material components in parts by weight: 300-500 parts of Portland cement, 50-70 parts of fly ash, 40-50 parts of river sand, 10-20 parts of rubber particles, 5-10 parts of rubber modified asphalt, 10-20 parts of a fiber composition, 10-20 parts of a nano compound, 5-10 parts of a flame-retardant compound, 3-5 parts of lignin fibers, 3-5 parts of modified sericite powder, 100-200 parts of tap water, 1-3 parts of a polycarboxylic acid water reducer and 1-3 parts of a silane coupling agent. The invention relates to the technical field of building materials. According to the modified rubber concrete and the preparation method thereof, the mechanical property and durability of the modified rubber concrete can be improved by adding a composite fiber material and a nano-composite into the concrete to achieve a synergistic effect, and the purpose of greatly improving the flame retardance of the concrete by mixing a flame-retardant composite into the concrete is achieved; the mechanical property, durability and flame retardance of the modified rubber concrete are greatly improved, so that the modified rubber concrete is very beneficial to popularization and application.

Description

Technical Field

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

[0002] Cement concrete is a common material used in road construction in my country. Among them, roller-compacted concrete (RCC) is a dry, cement-depleted concrete primarily composed of Portland cement, pozzolanic admixtures, water, admixtures, sand, and graded coarse aggregate, resulting in a slump-free, dry, hard concrete. RCC is characterized by its relatively low cement usage and rapid construction, offering significant advantages in highway construction. However, its crack resistance and durability are relatively poor. Meanwhile, with the development of my country's road infrastructure and the rapid growth of its automotive industry, my country has become the world's largest consumer of rubber. However, the recycling and utilization rate of waste rubber is currently very low, and large amounts of waste rubber cause significant damage to the human environment. The rational and efficient utilization of this waste rubber has become an urgent social challenge. Using rubber aggregate as a partial replacement for fine aggregate in road construction offers a significant solution, addressing both concrete's poor crack resistance and durability and the environmental pollution caused by the accumulation of waste tires.

[0003] The current modified rubber concrete has poor mechanical properties, durability and flame retardancy. It is impossible to improve the mechanical properties and durability of the modified rubber concrete by adding composite fiber materials and nanocomposites to the concrete for synergistic effect. It is also impossible to achieve the purpose of greatly improving the flame retardancy of the concrete by mixing flame retardant compounds into the concrete. It is also impossible to improve the components of the modified rubber concrete so that the modified rubber concrete can be used in some harsh environments, which is very unfavorable for the promotion and use of modified rubber concrete. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the deficiencies in the prior art, the present invention provides a modified rubber concrete and a preparation method thereof, which solve the problems that the existing modified rubber concrete has poor mechanical properties, durability and flame retardancy, cannot achieve the purpose of improving the mechanical properties and durability of the modified rubber concrete by adding composite fiber materials and nanocomposites to the concrete for synergistic effect, cannot achieve the purpose of greatly improving the flame retardancy of the concrete by mixing flame retardant compounds into the concrete, and cannot achieve the problem of improving the components of the modified rubber concrete to enable the modified rubber concrete to be used in some harsh environments.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical scheme: a modified rubber concrete, which includes, according to raw material components: 300-500 parts of Portland cement, 50-70 parts of fly ash, 40-50 parts of river sand, 10-20 parts of rubber particles, 5-10 parts of rubber-modified asphalt, 10-20 parts of fiber composition, 10-20 parts of nanocomposite, 5-10 parts of flame retardant compound, 3-5 parts of lignin fiber, 3-5 parts of modified sericite powder, 100-200 parts of tap water, 1-3 parts of polycarboxylic acid water reducer and 1-3 parts of silane coupling agent.

[0008] Preferably, 400 parts of silicate cement, 60 parts of fly ash, 45 parts of river sand, 15 parts of rubber particles, 7 parts of rubber modified asphalt, 15 parts of fiber composition, 15 parts of nanocomposite, 7 parts of flame retardant compound, 4 parts of lignin fiber, 4 parts of modified sericite powder, 150 parts of tap water, 2 parts of polycarboxylic acid water reducer and 2 parts of silane coupling agent.

[0009] Preferably, the silicate cement comprises 300 parts, fly ash 50 parts, river sand 40 parts, rubber particles 10 parts, rubber modified asphalt 5 parts, fiber composition 10 parts, nanocomposite 10 parts, flame retardant composite 5 parts, lignin fiber 3 parts, modified sericite powder 3 parts, tap water 100 parts, polycarboxylic acid water reducer 1 part and silane coupling agent 1 part.

[0010] Preferably, 500 parts of silicate cement, 70 parts of fly ash, 50 parts of river sand, 20 parts of rubber particles, 10 parts of rubber modified asphalt, 20 parts of fiber composition, 20 parts of nanocomposite, 10 parts of flame retardant compound, 5 parts of lignin fiber, 5 parts of modified sericite powder, 200 parts of tap water, 3 parts of polycarboxylic acid water reducer and 3 parts of silane coupling agent.

[0011] Preferably, the fiber composition is any combination of two or more of basalt fiber, bamboo fiber, polyvinyl alcohol fiber or polypropylene fiber.

[0012] Preferably, the nanocomposite is any combination of two or more of nano-aluminum oxide, nano-copper oxide, nano-iron oxide or nano-magnesium oxide.

[0013] Preferably, the flame retardant compound is any combination of two or more of aluminum hydroxide, magnesium hydroxide, zinc borate or borax.

[0014] The present invention also provides a method for preparing modified rubber concrete, which specifically comprises the following steps:

[0015] S1. Batching: Measure the required weight portions of Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame retardant composite, lignin fiber, modified sericite powder, tap water, polycarboxylic acid water reducer, and silane coupling agent respectively using a weighing device;

[0016] S2. Screening: The Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame-retardant composite, lignin fiber, and modified sericite powder weighed in step S1 are sequentially screened through a 100-200 mesh sieve. The residue that does not pass through the sieve is crushed by a pulverizing device and then screened again until all the residues are screened.

[0017] S3, primary mixing treatment: pour the Portland cement, fly ash, river sand, rubber particles and rubber-modified asphalt screened in step S2 into a mixing and stirring device, add some tap water and silane coupling agent, and mix and stir at a speed of 300-400 r / min for 20-30 minutes to obtain a primary mixture;

[0018] S4, secondary mixing treatment: pour the fiber composition, nanocomposite, flame retardant composite, lignin fiber and modified sericite powder screened in step S2 into the mixing and stirring equipment in step S3 in sequence, and add a polycarboxylic acid water reducer and the remaining tap water. After mixing and stirring at a speed of 500-600 r / min for 30-40 minutes, the modified rubber concrete is obtained.

[0019] (3) Beneficial effects

[0020] The present invention provides a modified rubber concrete and a preparation method thereof. Compared with the prior art, the modified rubber concrete and the preparation method thereof have the following advantages: the raw material components include: 300-500 parts of Portland cement, 50-70 parts of fly ash, 40-50 parts of river sand, 10-20 parts of rubber particles, 5-10 parts of rubber-modified asphalt, 10-20 parts of fiber composition, 10-20 parts of nanocomposite, 5-10 parts of flame retardant compound, 3-5 parts of lignin fiber, 3-5 parts of modified sericite powder, 100-200 parts of tap water, 1-3 parts of polycarboxylic acid water reducer and silicon 1-3 parts of alkyl coupling agent can improve the mechanical properties and durability of modified rubber concrete by adding composite fiber materials and nanocomposites to concrete for synergistic effect, achieve the purpose of greatly improving the flame retardancy of concrete by mixing flame retardant compounds into concrete, greatly improve the mechanical properties, durability and flame retardancy of modified rubber concrete, and improve the components of modified rubber concrete to enable modified rubber concrete to be used in some harsh environments, which is very beneficial to the promotion and use of modified rubber concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1 The present invention provides three technical solutions: a modified rubber concrete and a preparation method thereof, specifically including the following embodiments:

[0024] Example 1: A modified rubber concrete comprises, according to raw material components: 400 parts of Portland cement, 60 parts of fly ash, 45 parts of river sand, 15 parts of rubber particles, 7 parts of rubber-modified asphalt, 15 parts of fiber composition, 15 parts of nanocomposite, 7 parts of flame retardant composite, 4 parts of lignin fiber, 4 parts of modified sericite powder, 150 parts of tap water, 2 parts of polycarboxylic acid water reducer and 2 parts of silane coupling agent, the fiber composition is a combination of basalt fiber, bamboo fiber, polyvinyl alcohol fiber and polypropylene fiber, the nanocomposite is a combination of nano-aluminum oxide, nano-copper oxide, nano-iron oxide and nano-magnesium oxide, and the flame retardant composite is a combination of aluminum hydroxide, magnesium hydroxide, zinc borate and borax.

[0025] The present invention also provides a method for preparing modified rubber concrete, which specifically includes the following steps:

[0026] S1. Batching: Measure the required weight portions of Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame retardant composite, lignin fiber, modified sericite powder, tap water, polycarboxylic acid water reducer, and silane coupling agent respectively using a weighing device;

[0027] S2. Screening: The Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame-retardant composite, lignin fiber, and modified sericite powder weighed in step S1 are sequentially screened through a 150-mesh sieve. The residue that does not pass through the sieve is crushed by a pulverizing device and then screened again until all the residues are screened.

[0028] S3, primary mixing treatment: pour the Portland cement, fly ash, river sand, rubber particles and rubber-modified asphalt screened in step S2 into a mixing and stirring device, add some tap water and silane coupling agent, and mix and stir at a speed of 350 r / min for 25 minutes to obtain a primary mixture;

[0029] S4, secondary mixing treatment: pour the fiber composition, nanocomposite, flame retardant composite, lignin fiber and modified sericite powder screened in step S2 into the mixing and stirring equipment in step S3 in sequence, and add a polycarboxylic acid water reducer and the remaining tap water. After mixing and stirring at a speed of 550 r / min for 35 minutes, the modified rubber concrete is obtained.

[0030] Example 2: A modified rubber concrete comprises, according to raw material components: 300 parts of Portland cement, 50 parts of fly ash, 40 parts of river sand, 10 parts of rubber particles, 5 parts of rubber modified asphalt, 10 parts of fiber composition, 10 parts of nanocomposite, 5 parts of flame retardant composite, 3 parts of lignin fiber, 3 parts of modified sericite powder, 100 parts of tap water, 1 part of polycarboxylic acid water reducer and 1 part of silane coupling agent, the fiber composition is a combination of basalt fiber and bamboo fiber, the nanocomposite is a combination of nanoaluminum oxide and nanocopper oxide, and the flame retardant composite is a combination of aluminum hydroxide and magnesium hydroxide.

[0031] The present invention also provides a method for preparing modified rubber concrete, which specifically includes the following steps:

[0032] S1. Batching: Measure the required weight portions of Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame retardant composite, lignin fiber, modified sericite powder, tap water, polycarboxylic acid water reducer, and silane coupling agent respectively using a weighing device;

[0033] S2. Screening: The Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame-retardant composite, lignin fiber, and modified sericite powder weighed in step S1 are sequentially screened through a 100-mesh sieve. The residue that does not pass through the sieve is crushed by a pulverizing device and then screened again until all the residues are screened.

[0034] S3, primary mixing treatment: pour the Portland cement, fly ash, river sand, rubber particles and rubber-modified asphalt screened in step S2 into a mixing and stirring device, add some tap water and silane coupling agent, and mix and stir at a speed of 300 r / min for 20 minutes to obtain a primary mixture;

[0035] S4, secondary mixing treatment: pour the fiber composition, nanocomposite, flame retardant composite, lignin fiber and modified sericite powder screened in step S2 into the mixing and stirring equipment of step S3 in sequence, and add a polycarboxylic acid water reducer and the remaining tap water. After mixing and stirring at a speed of 500 r / min for 30 minutes, the modified rubber concrete is obtained.

[0036] Example 3: A modified rubber concrete comprises, according to raw material components: 500 parts of Portland cement, 70 parts of fly ash, 50 parts of river sand, 20 parts of rubber particles, 10 parts of rubber-modified asphalt, 20 parts of fiber composition, 20 parts of nanocomposite, 10 parts of flame retardant composite, 5 parts of lignin fiber, 5 parts of modified sericite powder, 200 parts of tap water, 3 parts of polycarboxylic acid water reducer and 3 parts of silane coupling agent, the fiber composition is a combination of polyvinyl alcohol fiber and polypropylene fiber, the nanocomposite is a combination of nano-iron oxide and nano-magnesium oxide, and the flame retardant composite is a combination of zinc borate and borax.

[0037] The present invention also provides a method for preparing modified rubber concrete, which specifically includes the following steps:

[0038] S1. Batching: Measure the required weight portions of Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame retardant composite, lignin fiber, modified sericite powder, tap water, polycarboxylic acid water reducer, and silane coupling agent respectively using a weighing device;

[0039] S2. Screening: The Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame-retardant composite, lignin fiber, and modified sericite powder weighed in step S1 are sequentially screened through a 200-mesh sieve. The residue that does not pass through the sieve is crushed by a pulverizing device and then screened again until all the residues are screened.

[0040] S3, primary mixing treatment: pour the Portland cement, fly ash, river sand, rubber particles and rubber-modified asphalt screened in step S2 into a mixing and stirring device, add some tap water and silane coupling agent, and mix and stir at a speed of 400 r / min for 30 minutes to obtain a primary mixture;

[0041] S4, secondary mixing treatment: pour the fiber composition, nanocomposite, flame retardant composite, lignin fiber and modified sericite powder screened in step S2 into the mixing and stirring equipment in step S3 in sequence, and add a polycarboxylic acid water reducer and the remaining tap water. After mixing and stirring at a speed of 600 r / min for 40 minutes, the modified rubber concrete is obtained.

[0042] In summary, the present invention can improve the mechanical properties and durability of modified rubber concrete by adding composite fiber materials and nanocomposites to concrete for synergistic effect, achieve the purpose of greatly improving the flame retardancy of concrete by mixing flame retardant compounds into concrete, greatly improve the mechanical properties, durability and flame retardancy of modified rubber concrete, and improve the components of modified rubber concrete to enable modified rubber concrete to be used in some harsh environments, which is very beneficial to the promotion and use of modified rubber concrete.

[0043] At the same time, the contents not described in detail in this specification belong to the existing technology well known to those skilled in the art.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A modified rubber concrete, characterized by: The raw material components include: 300-500 parts of Portland cement, 50-70 parts of fly ash, 40-50 parts of river sand, 10-20 parts of rubber particles, 5-10 parts of rubber modified asphalt, 10-20 parts of fiber composition, 10-20 parts of nanocomposite, 5-10 parts of flame retardant compound, 3-5 parts of lignin fiber, 3-5 parts of modified sericite powder, 100-200 parts of tap water, 1-3 parts of polycarboxylic acid water reducer and 1-3 parts of silane coupling agent.

2. The modified rubber concrete according to claim 1, characterized in that: The raw material components include: 400 parts of Portland cement, 60 parts of fly ash, 45 parts of river sand, 15 parts of rubber particles, 7 parts of rubber modified asphalt, 15 parts of fiber composition, 15 parts of nanocomposite, 7 parts of flame retardant compound, 4 parts of lignin fiber, 4 parts of modified sericite powder, 150 parts of tap water, 2 parts of polycarboxylic acid water reducer and 2 parts of silane coupling agent.

3. The modified rubber concrete according to claim 1, characterized in that: The raw material components include: 300 parts of Portland cement, 50 parts of fly ash, 40 parts of river sand, 10 parts of rubber particles, 5 parts of rubber modified asphalt, 10 parts of fiber composition, 10 parts of nanocomposite, 5 parts of flame retardant compound, 3 parts of lignin fiber, 3 parts of modified sericite powder, 100 parts of tap water, 1 part of polycarboxylic acid water reducer and 1 part of silane coupling agent.

4. The modified rubber concrete according to claim 1, characterized in that: The raw material components include: 500 parts of Portland cement, 70 parts of fly ash, 50 parts of river sand, 20 parts of rubber particles, 10 parts of rubber modified asphalt, 20 parts of fiber composition, 20 parts of nanocomposite, 10 parts of flame retardant compound, 5 parts of lignin fiber, 5 parts of modified sericite powder, 200 parts of tap water, 3 parts of polycarboxylic acid water reducer and 3 parts of silane coupling agent.

5. The modified rubber concrete according to any one of claims 1 to 4, characterized in that: The fiber composition is any combination of two or more of basalt fiber, bamboo fiber, polyvinyl alcohol fiber or polypropylene fiber.

6. The modified rubber concrete according to any one of claims 1 to 4, characterized in that: The nanocomposite is any combination of two or more of nano-aluminum oxide, nano-copper oxide, nano-iron oxide or nano-magnesium oxide.

7. The modified rubber concrete according to any one of claims 1 to 4, characterized in that: The flame retardant compound is any combination of two or more of aluminum hydroxide, magnesium hydroxide, zinc borate or borax.

8. A method for preparing the modified rubber concrete according to any one of claims 1 to 4, characterized in that: The specific steps include: S1. Batching: Measure the required weight portions of Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame retardant composite, lignin fiber, modified sericite powder, tap water, polycarboxylic acid water reducer, and silane coupling agent respectively using a weighing device; S2. Screening: The Portland cement, fly ash, river sand, rubber particles, rubber-modified asphalt, fiber composition, nanocomposite, flame-retardant composite, lignin fiber, and modified sericite powder weighed in step S1 are sequentially screened through a 100-200 mesh sieve. The residue that does not pass through the sieve is crushed by a pulverizing device and then screened again until all the residues are screened. S3, primary mixing treatment: pour the Portland cement, fly ash, river sand, rubber particles and rubber-modified asphalt screened in step S2 into a mixing and stirring device, add some tap water and silane coupling agent, and mix and stir at a speed of 300-400 r / min for 20-30 minutes to obtain a primary mixture; S4, secondary mixing treatment: pour the fiber composition, nanocomposite, flame retardant composite, lignin fiber and modified sericite powder screened in step S2 into the mixing and stirring equipment in step S3 in sequence, and add a polycarboxylic acid water reducer and the remaining tap water. After mixing and stirring at a speed of 500-600 r / min for 30-40 minutes, the modified rubber concrete is obtained.

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