阅读说明：本技术 一种橡胶再生混凝土及其制备方法 (Rubber recycled concrete and preparation method thereof ) 是由 赵剑柏 谢建和 陈壁坤 林鑫潮 黄亮 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种橡胶再生混凝土及其制备方法,所述橡胶再生混凝土包括如下按重量份数计算的组分：水泥400～550份,再生粗骨料950～1100份,河砂550～650份,橡胶颗粒25～30份,减水剂1～5份,水170～190份；所述再生粗骨料经纳米SiO<Sub>2</Sub>硅溶胶溶液处理；所述橡胶颗粒经纳米SiO<Sub>2</Sub>硅溶胶溶液和硅烷偶联剂处理。本发明提供的橡胶再生混凝土中再生粗骨料和再生粗骨料经特殊处理,并搭配一定含量的水泥、河砂、减水剂和水。该橡胶再生混凝土不含外加掺和料,再生粗骨料、橡胶颗粒与凝胶材料结合紧密,制得的橡胶再生混凝土依然具有良好的力学性能,可广泛应用于多种领域,很好地解决了橡胶再生混凝土的力学性能差、使用范围受限的缺陷。(The invention discloses rubber recycled concrete and a preparation method thereof, wherein the rubber recycled concrete comprises the following components in parts by weight: 400-550 parts of cement, 950-1100 parts of recycled coarse aggregate, 550-650 parts of river sand, 25-30 parts of rubber particles, 1-5 parts of a water reducing agent and 170-190 parts of water; the recycled coarse aggregate is processed by nano SiO 2 Treating with silica sol solution; the rubber particles are processed by nano SiO 2 Treating the silica sol solution and a silane coupling agent. The regenerated coarse aggregate and the regenerated coarse aggregate in the rubber recycled concrete provided by the invention are specially treated and matched with cement and river with certain contentSand, a water reducing agent and water. The rubber recycled concrete does not contain an external admixture, the recycled coarse aggregate, the rubber particles and the gel material are tightly combined, the prepared rubber recycled concrete still has good mechanical property, can be widely applied to various fields, and well overcomes the defects of poor mechanical property and limited application range of the rubber recycled concrete.)

1. The rubber recycled concrete is characterized by comprising the following components in parts by weight:

400-550 parts of cement, 950-1100 parts of recycled coarse aggregate, 550-650 parts of river sand, 25-30 parts of rubber particles, 1-5 parts of a water reducing agent and 170-190 parts of water;

the recycled coarse aggregate is processed by nano SiO ₂Treating with silica sol solution;

the rubber particles are processed by nano SiO ₂Treating the silica sol solution and a silane coupling agent.

2. The rubber-recycled concrete of claim 1, comprising the following components in parts by weight:

460 parts of cement, 1050 parts of recycled coarse aggregate, 630 parts of river sand, 27 parts of rubber particles, 2 parts of water reducing agent and 185 parts of water.

3. Rubber recycled concrete according to claim 1, characterized in that said rubber particles are obtained by: completely soaking in nano SiO ₂And (3) soaking the rubber particles in the silica sol solution for 18-24 hours, then completely soaking the rubber particles in the silane coupling agent for 18-24 hours, and naturally drying.

4. The rubber recycled concrete of claim 1, wherein the rubber particles have a particle size comprising 10 mesh, 20 mesh, 40 mesh, and 60 mesh; the mass fractions of 10 meshes, 20 meshes, 40 meshes and 60 meshes in the rubber particles are respectively 20%, 30% and 20%.

5. The rubber-recycled concrete according to claim 1, wherein said recycled coarse aggregate is obtained by: completely soaking in nano SiO ₂And (5) naturally drying the silica sol solution for 36-48 hours.

6. Rubber recycled concrete according to claim 3 or 5, characterized in that said nano SiO ₂The mass percentage concentration of the silica sol solution is 0.5-2%.

7. The rubber recycled concrete according to claim 1, wherein the recycled coarse aggregate is continuously graded in a range of 5mm to 20 mm.

8. The rubber recycled concrete of claim 1, wherein the river sand has a particle size ranging from 0.1mm to 3.5mm and a fineness modulus of 2.7 to 3.2.

9. The rubber-recycled concrete according to claim 1, wherein the mass ratio of the cement to the water is 1 (0.38-0.44).

10. The method for producing a rubber-recycled concrete as claimed in any one of claims 1 to 9, characterized by comprising the steps of:

s1, mixing the treated rubber particles with half of the total amount of river sand, cement, water and a water reducing agent to obtain a first premix;

s2, mixing the treated recycled coarse aggregate with the rest river sand, cement, water and a water reducing agent to obtain a second premix;

and S3, mixing the first premix and the second premix to obtain the rubber recycled concrete.

Technical Field

The invention relates to the technical field of building materials, in particular to rubber recycled concrete and a preparation method thereof.

Background

Concrete is a general term for cement-based composite materials in which aggregates are cemented into a whole by a cementing material. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the common concrete obtained by mixing the concrete with water (which may contain an additive and an admixture) according to a certain proportion and stirring is widely applied to the field of civil engineering.

China is in a stage of economic rapid development, a large number of old buildings which do not conform to the current city plan are dismantled, a large number of waste concrete is generated, and serious resource waste and environmental pollution are caused; meanwhile, with the continuous improvement of living standard of people, automobiles become necessary transportation means for many families, and the automobiles generate a large amount of waste tires, so that serious resource waste and black pollution are caused, and therefore, the treatment of the waste tires becomes a social problem to be solved urgently.

Based on the background, rubber recycled concrete is produced at the same time, and the rubber recycled concrete is a novel concrete material which uses recycled coarse aggregate to replace primary coarse aggregate and rubber to partially replace part of fine aggregate, thereby achieving the purpose of recycling waste. However, as the recycled coarse aggregate has the characteristics of high water absorption, hydrophobic rubber particles and the like, the combination of the aggregate and the cementing material is not tight enough, so that the defects of poor mechanical property, limited application range and the like of the rubber recycled concrete are caused.

Therefore, a rubber recycled concrete and a preparation method thereof are developed to solve the technical defects of poor mechanical properties and limited application range of the rubber recycled concrete in the prior art, and become a problem to be solved by technical personnel in the field.

Disclosure of Invention

The invention provides the rubber recycled concrete for overcoming the defects of poor mechanical property and limited application range of the rubber recycled concrete in the prior art, and the provided rubber recycled concrete has good mechanical property and can be widely applied to various fields.

In order to solve the technical problems, the invention adopts the technical scheme that:

the rubber recycled concrete comprises the following components in parts by weight:

400-550 parts of cement, 950-1100 parts of recycled coarse aggregate, 550-650 parts of river sand, 25-30 parts of rubber particles, 1-5 parts of a water reducing agent and 170-190 parts of water;

the recycled coarse aggregate is processed by nano SiO ₂Treating with silica sol solution;

the rubber particles are processed by nano SiO ₂Treating the silica sol solution and a silane coupling agent.

The rubber recycled concrete belongs to rubber recycled concrete, wherein recycled coarse aggregate is processed by nano SiO ₂Treating the silica sol solution to obtain modified recycled coarse aggregate; rubber particle is processed by nano SiO ₂Treating the silica sol solution and a silane coupling agent to obtain the reinforced rubber particles. The regenerated coarse aggregate and the rubber particles are matched with cement, river sand, a water reducing agent and water with certain content to obtain brand new rubber regenerated concrete. The rubber recycled concrete does not contain an external admixture, the recycled coarse aggregate, the rubber particles and the gel material are tightly combined, the prepared rubber recycled concrete still has good mechanical property, can be widely applied to various fields, and well overcomes the defects of poor mechanical property and limited application range of the rubber recycled concrete.

Preferably, the rubber recycled concrete comprises the following components in parts by weight:

400-500 parts of cement, 100-1100 parts of recycled coarse aggregate, 550-600 parts of river sand, 25-30 parts of rubber particles, 1-3 parts of a water reducing agent and 170-190 parts of water.

More preferably, the rubber recycled concrete comprises the following components in parts by weight:

500 parts of cement, 1000 parts of recycled coarse aggregate, 600 parts of river sand, 30 parts of rubber particles, 3 parts of a water reducing agent and 190 parts of water.

Preferably, the rubberThe gum particles were obtained by the following process: completely soaking in nano SiO ₂And (3) soaking the rubber particles in the silica sol solution for 18-24 hours, then completely soaking the rubber particles in the silane coupling agent for 18-24 hours, and naturally drying.

More preferably, the rubber particles are obtained by: completely soaking in nano SiO ₂And (3) soaking the rubber particles in the silica sol solution for 24 hours, then completely soaking the rubber particles in the silane coupling agent for 24 hours, and naturally drying.

Preferably, the silane coupling agent is KH-560.

Preferably, the particle size of the rubber particles includes 10 mesh, 20 mesh, 40 mesh and 60 mesh; the mass fractions of 10 meshes, 20 meshes, 40 meshes and 60 meshes in the rubber particles are respectively 20%, 30% and 20%.

Preferably, the treatment process of the recycled coarse aggregate is as follows: completely soaking in nano SiO ₂And (5) naturally drying the silica sol solution for 36-48 hours.

More preferably, the treatment process of the recycled coarse aggregate is as follows: completely soaking in nano SiO ₂And (5) soaking in the silica sol solution for 48 hours, and naturally drying.

Preferably, the nano SiO ₂The mass percentage concentration of the silica sol solution is 0.5-2%.

More preferably, the nano SiO ₂The mass percentage concentration of the silica sol solution is 2 percent.

Preferably, the recycled coarse aggregate is in 5 mm-20 mm continuous gradation. The recycled coarse aggregate belongs to II or III type recycled coarse aggregates. The properties of the recycled coarse aggregate meet the regulations in GB/T25177-2010 concrete recycled coarse aggregate.

Preferably, the river sand has a particle size range of 0.1-3.5 mm and a fineness modulus of 2.7-3.2. The river sand is medium coarse type river sand with good gradation.

The cement is P.O42.5.

Preferably, the mass ratio of the cement to the water is 1 (0.38-0.44).

Preferably, the water reducing agent is a polycarboxylic acid water reducing agent. Preferably, the water reducing rate of the water reducing agent is 20-30%.

The invention also provides a preparation method of the rubber recycled concrete, which comprises the following steps:

s1, mixing the treated rubber particles with half of the total amount of river sand, cement, water and a water reducing agent to obtain a first premix;

s2, mixing the treated recycled coarse aggregate with the rest river sand, cement, water and a water reducing agent to obtain a second premix;

and S3, mixing the first premix and the second premix to obtain the rubber recycled concrete.

Preferably, the mixing operation in the step S1 is stirring for 5-8 min.

Preferably, the mixing operation in the step S2. is stirring for 5-8 min.

Preferably, the mixing operation in the step S3 is stirring for 5-8 min.

The mixing may be carried out using a concrete mixer conventional in the art.

Preferably, the rubber recycled concrete is subjected to die filling, vibrating, curing and curing to obtain cured concrete.

Compared with the prior art, the invention has the beneficial effects that:

the rubber recycled concrete provided by the invention is prepared from nanometer SiO ₂Regenerated coarse aggregate treated by silica sol solution and nano SiO ₂The recycled coarse aggregate is obtained by mixing the silica sol solution and the silane coupling agent treated recycled coarse aggregate with a certain content of cement, river sand, a water reducing agent and water. The rubber recycled concrete does not contain an external admixture, the recycled coarse aggregate, the rubber particles and the gel material are tightly combined, the prepared rubber recycled concrete still has good mechanical property, can be widely applied to various fields, and well overcomes the defects of poor mechanical property and limited application range of the rubber recycled concrete.

Detailed Description

The present invention will be further described with reference to the following embodiments.