Preparation and application of rubber concrete

Abstract

The invention provides preparation and application of rubber concrete. The rubber concrete comprises the following raw materials: 460-650 Kg / m < 3 > of cement, 300-800 Kg / m < 3 > of aggregate, 350-950 Kg / m < 3 > of rubber particles, 120-170 Kg / m < 3 > of water, 110-350 Kg / m < 3 > of a reinforcing agent and 110-330 Kg / m < 3 > of a water reducing agent. The preparation method mainly comprises a hot method and a cold method, the waste rubber tires are crushed into particles and mixed into the concrete, so that the durability of the concrete is improved, the cyclic utilization of resources is realized, the concrete has remarkable environmental protection significance, and the related construction method has important application value in the building industry. Through reasonable preparation and construction processes, the rubber concrete can significantly improve the durability and environmental protection performance of a building structure, and contributes to sustainable development. With continuous progress of science and technology and improvement of environmental awareness, rubber concrete will play a greater role in the building field in the future.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, and in particular to the preparation and application of rubber concrete. Background Art

[0002] Traditional concrete materials have poor ductility, easy cracking and poor resistance to environmental erosion. The huge demand for cars in today's society has not only accelerated the replacement of cars, but also caused a large number of tires to be discarded. Waste rubber is not easy to degrade. Landfill treatment not only takes up land but also causes great pollution to the soil and groundwater environment. Although incineration can recover some of the energy, it will cause air pollution. Therefore, the generation and accumulation of a large amount of waste rubber have constituted serious "black pollution". According to the China Tire Retreading and Utilization Association, the amount of waste tires generated in 2010 will reach more than 200 million, while the current recycling rate of waste tires in my country is less than 30%. Shredding and grinding waste tires and adding them to concrete to make rubber concrete is becoming a hot topic in the field of concrete research. Summary of the invention

[0003] The purpose of the present invention is to provide a preparation and application of rubber concrete, which, as an emerging building material, has attracted more and more attention in the construction industry in recent years. By crushing waste rubber tires into particles and mixing them into concrete, it not only improves the durability of concrete, but also realizes the recycling of resources, which has significant environmental protection significance.

[0004] The technical solution of the present invention is: in order to solve the above technical problems, the present invention provides a preparation and application of rubber concrete, the raw materials of ready-mixed concrete are screened, and the ingredients are mixed according to the proportion and process after screening. According to the mass fraction, the raw materials include:

[0005] The components and contents of each group are as follows:

[0006] Cement 460-650Kg / m 3 ;

[0007] Aggregate 300-800Kg / m 3 ;

[0008] Rubber particles: 350-950Kg / m 3 ;

[0009] Water 120-170Kg / m 3 ;

[0010] Reinforcement agent 110-350Kg / m 3 ;

[0011] Water reducing agent 110-330Kg / m 3 ;

[0012] Preparation method:

[0013] There are two main methods for preparing rubber concrete: hot method and cold method:

[0014] Thermal method: During the concrete mixing process, the rubber particles are heated to a certain temperature using steam or heating, and then mixed evenly with cement, aggregates, etc.

[0015] Material preparation: The main materials of rubber concrete include cement, aggregate (sand, gravel), rubber particles, reinforcing agent, water reducing agent and water. The specific material proportions can be adjusted according to different needs;

[0016] Put the concrete product into hot water and completely immerse it in the water; wait for the hot water to heat to 80℃ to 100℃ and keep it for a certain period of time, generally a few hours to a few days; take out the concrete product and place it in the natural environment to dry;

[0017] Mixing and stirring: first pour the aggregate sand and rubber particles into the mixer, add cement, then add crushed stone, and stir; then add the reinforcing agent, water reducer and water, and continue to stir until it is uniform. You can also mix the rubber particles, sand and cement evenly, then add the water reducer and water, and continue to stir until the concrete is uniform and there are no dry powder lumps;

[0018] Pouring and curing: Pour the mixed slurry into the mold, vibrate it evenly, and let it stand for a period of time (usually 3-4 hours) for curing to solidify the concrete. During the curing process, it is necessary to maintain appropriate humidity and temperature to ensure the strength and durability of the concrete.

[0019] Cold method: Mix the rubber particles with cement, aggregate, etc. evenly without heating treatment.

[0020] Material preparation: The main materials of rubber concrete include cement, aggregate (sand, gravel), rubber particles, reinforcing agent, water reducing agent and water. The specific material proportions can be adjusted according to different needs;

[0021] Mixing and stirring: first pour the aggregate sand and rubber particles into the mixer, add cement, then add crushed stone, and stir; then add the reinforcing agent, water reducer and water, and continue to stir until it is uniform. You can also mix the rubber particles, sand and cement evenly, then add the water reducer and water, and continue to stir until the concrete is uniform and there are no dry powder lumps;

[0022] Pouring and curing: Pour the mixed slurry into the mold, vibrate it evenly, and let it stand for a period of time (usually 3-4 hours) for curing to solidify the concrete. During the curing process, it is necessary to maintain appropriate humidity and temperature to ensure the strength and durability of the concrete.

[0023] The rubber particles are made from rubber particles recovered from waste tires, and the particle size is generally 0.3-2.5 mm;

[0024] The cement quality grade is ordinary Portland cement of P.O42.5;

[0025] The aggregates include coarse aggregates and fine aggregates;

[0026] The coarse aggregate can be crushed stone, pebbles, or artificial light aggregate, with a particle diameter of ≥4.75mm; these coarse aggregates can be used alone or in combination, and the specific selection depends on the engineering needs and design requirements;

[0027] The sand with a particle size of fine aggregate between 0.25-2.5 mm is also called medium-coarse sand;

[0028] The ratio of cement: sand: gravel: rubber particles is 1:1.5:2:0.2;

[0029] The coarse aggregate is required to have a mud content of less than 0.5%, a mud block content of 0, and a mass loss of no more than 5%;

[0030] The content of needle-like and flake-like particles in the sandless porous concrete coarse aggregate is not more than 15% by mass;

[0031] The mud content (including powder content) in the crushed stone should not be greater than 1%;

[0032] The water reducing agent: plasticizer, superplasticizer, etc. 1.5%-4.7%;

[0033] The early strength agent is generally added in an amount of 1% to 2% to accelerate the concrete to reach the designed strength.

[0034] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention adds a certain proportion of waste rubber particles into concrete. The elasticity of the rubber particles can alleviate the stress concentration inside the concrete, reduce the probability of primary crack defects, have good wear resistance, impact resistance and crack resistance, and reduce the pressure on the environment and resources. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described clearly and completely below. 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 creative work are within the scope of protection of the present invention.

[0036] The present invention provides a preparation and application of rubber concrete, wherein the raw materials of ready-mixed concrete are screened, and the ingredients are mixed according to the proportion and process after the screening. The raw materials include the following in terms of mass fraction:

[0037] The components and contents of each group are as follows:

[0038] Cement 460-650Kg / m 3 ;

[0039] Aggregate 300-800Kg / m 3 ;

[0040] Rubber particles: 350-950Kg / m 3 ;

[0041] Water 120-170Kg / m 3 ;

[0042] Reinforcement agent 110-350Kg / m 3 ;

[0043] Water reducing agent 110-330Kg / m 3 ;

[0044] Preparation method:

[0045] There are two main methods for preparing rubber concrete: hot method and cold method:

[0046] Thermal method: During the concrete mixing process, the rubber particles are heated to a certain temperature using steam or heating, and then mixed evenly with cement, aggregates, etc.

[0047] Material preparation: The main materials of rubber concrete include cement, aggregate (sand, gravel), rubber particles, reinforcing agent, water reducing agent and water. The specific material proportions can be adjusted according to different needs.

[0048] Put the concrete product into hot water and immerse it completely in the water; wait for the hot water to heat to 80℃ to 100℃ and keep it for a certain period of time, usually several hours to several days; take out the concrete product and place it in the natural environment to dry.

[0049] Mixing and stirring: Pour aggregate sand and rubber particles into the mixer first, add cement, then add crushed stone, and stir; then add reinforcing agent, water reducer and water, and continue to stir until it is uniform. You can also mix rubber particles, sand and cement evenly, then add water reducer and water, and continue to stir until the concrete is uniform and there are no dry powder lumps.

[0050] Pouring and curing: Pour the mixed slurry into the mold, vibrate it evenly, and let it stand for a period of time (usually 3-4 hours) for curing to solidify the concrete. During the curing process, it is necessary to maintain appropriate humidity and temperature to ensure the strength and durability of the concrete.

[0051] Cold method: Mix the rubber particles with cement, aggregate, etc. evenly without heating treatment.

[0052] Material preparation: The main materials of rubber concrete include cement, aggregate (sand, gravel), rubber particles, reinforcing agent, water reducing agent and water. The specific material proportions can be adjusted according to different needs.

[0053] Mixing and stirring: Pour aggregate sand and rubber particles into the mixer first, add cement, then add crushed stone, and stir; then add reinforcing agent, water reducer and water, and continue to stir until it is uniform. You can also mix rubber particles, sand and cement evenly, then add water reducer and water, and continue to stir until the concrete is uniform and there are no dry powder lumps.

[0054] Pouring and curing: Pour the mixed slurry into the mold, vibrate it evenly, and let it stand for a period of time (usually 3-4 hours) for curing to solidify the concrete. During the curing process, it is necessary to maintain appropriate humidity and temperature to ensure the strength and durability of the concrete.

[0055] The rubber particles are made from rubber particles recovered from waste tires, and the particle size is generally 0.3-2.5 mm;

[0056] The cement quality grade is ordinary Portland cement of P.O42.5;

[0057] The aggregates include coarse aggregates and fine aggregates;

[0058] The coarse aggregate can be crushed stone, pebbles, or artificial light aggregate, with a particle diameter of ≥4.75mm; these coarse aggregates can be used alone or in combination, and the specific selection depends on the engineering needs and design requirements;

[0059] The sand with a particle size of fine aggregate between 0.25-2.5 mm is also called medium-coarse sand;

[0060] The ratio of cement: sand: gravel: rubber particles is 1:1.5:2:0.2;

[0061] The coarse aggregate is required to have a mud content of less than 0.5%, a mud block content of 0, and a mass loss of no more than 5%;

[0062] The content of needle-like and flake-like particles in the sandless porous concrete coarse aggregate is not more than 15% by mass;

[0063] The mud content (including powder content) in the crushed stone should not be greater than 1%;

[0064] The water reducing agent: plasticizer, superplasticizer, etc. 1.5%-4.7%;

[0065] The early strength agent is generally added in an amount of 1% to 2% to accelerate the concrete to reach the designed strength.

[0066] It can be walked on 24 to 30 hours after construction. After 28 days, the compressive strength reaches 19.8MPa and the flexural strength is not less than 7.4MPa. The bonding strength with the steel plate is 1.25MPa. It has good thermal insulation performance, is non-flammable and non-explosive when heated at 800℃, and deforms with the substrate. The thermal conductivity coefficient is 0.01 to 0.58w / (m·K) depending on the formula; it has low water absorption and good anti-seepage performance; it is resistant to corrosion by dilute non-oxidizing acids and alkalis; it is elastic, comfortable to walk on, easy to construct, low cost, and non-toxic.

[0067] Application Areas

[0068] Highway engineering: Rubber concrete can be used as a road surface material. It has good crack resistance and wear resistance, which can effectively reduce road cracking and wear of vehicle tires on the road surface, and extend the service life of the road surface. In addition, rubber concrete also has good sound absorption performance, which can reduce vehicle noise pollution.

[0069] Water conservancy projects: Rubber concrete can be used to make impact-resistant structures such as dams and breakwaters. The elasticity of rubber particles can absorb the impact of water flow, reduce the vibration of the structure, and improve the stability of the structure. In addition, rubber concrete can also be used to make cement slurry walls to prevent soil loss and foundation settlement.

[0070] Construction projects: Rubber concrete has good earthquake resistance and can be used to make earthquake-resistant walls, columns and other structures. The elasticity of rubber particles can absorb earthquake energy, reduce the vibration of buildings, and improve the earthquake resistance of buildings. In addition, rubber concrete also has good thermal insulation properties and can be used to make thermal insulation walls to improve the energy-saving performance of buildings.

[0071] Performance characteristics

[0072] Rubber concrete has the following advantages over ordinary concrete:

[0073] Crack resistance: The elasticity of rubber particles can alleviate stress concentration inside the concrete and reduce the chance of primary crack defects.

[0074] Antifreeze performance: The antifreeze performance of rubber concrete is better than that of ordinary concrete.

[0075] Abrasion resistance: The elasticity and plasticity of rubber particles can dissipate the energy applied from the outside and inhibit damage to the internal structure.

[0076] Sound insulation and heat insulation performance: The sound insulation and heat insulation performance of rubber concrete are better than those of ordinary concrete, and it is suitable for building structures that need to reduce noise and keep warm.

[0077] As an innovative building material, rubber concrete has received more and more attention in the construction industry in recent years. By crushing waste rubber tires into particles and mixing them into concrete, it not only improves the durability of concrete, but also realizes the recycling of resources, which has significant environmental significance. Its related construction methods have important application value in the construction industry. Through reasonable preparation and construction processes, rubber concrete can significantly improve the durability and environmental performance of building structures and contribute to sustainable development. With the continuous advancement of science and technology and the improvement of environmental awareness, rubber concrete will play a greater role in the future construction field.

Claims

1. Preparation and application of rubber concrete, characterized by: The raw materials for ready-mixed concrete are screened and then mixed according to the proportions and processes. According to the mass percentage, it includes the following raw materials, and the components and contents of each component are as follows: Cement 460-650Kg / m 3 , aggregate 300-800Kg / m 3 , rubber particles: 350-950Kg / m 3 , water 120-170Kg / m 3 , reinforcing agent 110-350Kg / m 3 , water reducing agent 110-330Kg / m 3 .

2. The preparation and application of the rubber concrete according to claim 1 is characterized by: There are two main methods for preparing the rubber concrete: a hot method and a cold method.

3. The preparation and application of the rubber concrete according to claim 1 is characterized by: The rubber particles are made from rubber particles recovered from waste tires, and the particle size is generally 0.3-2.5 mm.

4. The preparation and application of the rubber concrete according to claim 1 is characterized by: The cement quality grade is ordinary Portland cement with P.O42.

5.

5. The preparation and application of the rubber concrete according to claim 1 is characterized by: The early strength agent is generally added in an amount of 1% to 2%.

6. The preparation and application of the rubber concrete according to claim 1 is characterized by: The aggregates include coarse aggregates and fine aggregates.

7. The preparation and application of the rubber concrete according to claim 6, characterized in that: The coarse aggregate can be crushed stone, pebble, or artificial light aggregate, with particles having a diameter of ≥4.75 mm; these coarse aggregates can be used alone or in combination, and the specific selection depends on engineering needs and design requirements.

8. The preparation and application of the rubber concrete according to claim 6, characterized in that: The fine aggregate particle size is sand between 0.25-2.5 mm.

9. The preparation and application of the rubber concrete according to claim 1, characterized in that: The ratio of cement:sand:gravel:rubber particles is 1:1.5:2:0.

2.

10. The preparation and application of the rubber concrete according to claim 1, characterized in that: The water reducing agent: Plasticizers, superplasticizers, etc. 1.5%-4.7%.