CN114394804A - High-elasticity concrete for road sound absorption and preparation method thereof - Google Patents

Abstract

The invention relates to the field of concrete, and particularly discloses high-elasticity concrete for road sound absorption and a preparation method thereof. A highly elastic concrete for road sound absorption comprising: water, cement, fly ash, sand, stone, rubber particles and an additive, wherein the rubber particles comprise: natural rubber, styrene butadiene rubber, oil, hard carbon black, white carbon black, glass fiber, mineral filler, zinc oxide, stearic acid, paraffin, an anti-aging agent, a scorch retarder, a coupling agent, sulfur and an accelerator, wherein the mineral filler is prepared by compounding and calcining silica, argil, montmorillonite and kaolin. The preparation method comprises the following steps: 1) preparing rubber particles; 2) uniformly mixing water, cement, fly ash and an additive; 3) putting sand and rubber particles into the cement slurry, and uniformly mixing; 4) and (3) injecting the concrete mixture into a mould, curing and demoulding to obtain the high-elasticity concrete for road sound absorption. The invention has the advantage of improving the strength of the concrete doped with rubber.

Description

High-elasticity concrete for road sound absorption and preparation method thereof

Technical Field

The invention relates to the field of concrete, in particular to high-elasticity concrete for road sound absorption and a preparation method thereof.

Background

The concrete is a material formed by matching cement, aggregate and additives, and has good plasticity in the early period and strong strength after hardening, so the concrete becomes an important member in the modern building materials.

Along with social development, people have increasingly large demands on traffic, the development of the traffic directly influences the development of economy, the development of the traffic cannot depart from the construction of roads, and after a large amount of research, an asphalt pavement and a concrete pavement become mainstream, wherein the asphalt pavement has elasticity, the driving comfort and the noise reduction effect are excellent, but the asphalt material belongs to a petrochemical product, and after a large amount of asphalt materials are used, the cost of the asphalt material is increasingly high, the strength of the asphalt pavement is low, the asphalt pavement is easy to damage, frequent repair is needed, and the maintenance cost is high.

The concrete pavement is a rigid pavement, so that the bearing effect is better, the pavement is smoother, but in the running process of an automobile, the generated vibration is larger, and larger noise can be generated, so that the running experience is influenced, and noise pollution is caused to people on the roadside.

Therefore, through research discovery, mix the rubber granule in the concrete, can make the elasticity of concrete promote, produce certain elastic deformation to reduce vibration, reduce the production of noise, can improve the driving experience moreover, be the new theme of research at present.

However, after the existing concrete is mixed with rubber, because the bearing capacity of the rubber is far lower than that of sand and stone, and meanwhile, in order to ensure that elastic deformation can occur, the cement dosage needs to be controlled, the compressive strength of the prepared concrete can only reach about 20Mpa generally, although most of service environments can be met, the bearing of the concrete still restricts the improvement of traffic and transportation capacity, the bearing capacity of a vehicle with a large load is not enough, the popularization of the concrete is difficult, and therefore, the concrete has an improvement space.

Disclosure of Invention

In order to improve the strength of concrete doped with rubber, the application provides high-elasticity concrete for road sound absorption and a preparation method thereof.

In a first aspect, the present application provides a high-elasticity concrete for sound absorption on roads, which adopts the following technical scheme:

the high-elasticity concrete for sound absorption of the road comprises the following components in parts by mass:

100 parts of water;

156 portions of cement and 157 portions;

31.5-32 parts of fly ash;

442-448 parts of sand;

361 and 364 portions of stone;

361 and 364 portions of rubber particles;

2.6-2.7 parts of an additive;

the rubber particles comprise the following components in parts by mass:

40-42 parts of natural rubber;

58-60 parts of styrene butadiene rubber;

5-8 parts of oil;

50-52 parts of hard carbon black;

20-22 parts of white carbon black;

10-11 parts of glass fiber;

44-45 parts of mineral filler;

3.3-3.7 parts of zinc oxide;

1.8-2.2 parts of stearic acid;

1.8-2.2 parts of paraffin;

1.1-1.2 parts of an anti-aging agent;

0.4-0.5 part of scorch retarder;

2-2.2 parts of a coupling agent;

1.1-1.2 parts of sulfur;

0.82-0.85 part of accelerator;

the mineral filler is prepared by compounding and calcining silica, argil, montmorillonite and kaolin.

By adopting the technical scheme, the rubber particles with specific proportion and special formula are doped, so that the rubber particles have better compatibility with cement and better play the role of aggregate, the prepared concrete has better elastic deformation capability and higher compressive strength, the prepared concrete pavement can bear the traffic of vehicles with larger load capacity, the applicability is wider, and the high-elasticity concrete for road sound absorption is easier to popularize and apply.

Mineral filler is added into the rubber particles, so that the crushing strength of the rubber particles is enhanced, and the prepared concrete has stronger compressive strength macroscopically due to stronger compressive capacity of the aggregate on the premise that the cement using amount is not increased.

The mineral filler is formed by compounding and calcining silica, argil, montmorillonite and kaolin, so that the special mineral filler with high compressive strength is formed after calcination, and the mineral filler is in a powder shape with a small particle size after calcination, is uniformly dispersed when being doped into rubber, and has an excellent reinforcing effect on the rubber.

Through the addition of glass fiber, produce better reinforcement effect to rubber granule's tensile strength to make rubber granule be difficult for destroying after extrusion deformation, with the cooperation of mineral filler, further improve rubber granule's crushing strength.

The natural rubber and the styrene-butadiene rubber are matched in a specific proportion, so that the crushing strength of the prepared rubber particles is improved, the durability is better, meanwhile, the hard carbon black and the white carbon black are added, and only a small amount of oil is added, so that the prepared rubber particles have higher hardness and better compression resistance, the prepared concrete can better bear pressure as the aggregate of the concrete, and the prepared concrete has better elastic deformation, higher compression resistance and better quality.

Preferably, the mass ratio of the silica, the argil, the montmorillonite and the kaolin is 1: 1.2: 0.3: 0.5.

by adopting the technical scheme, the silica, the argil, the montmorillonite and the kaolin are matched in a specific proportion, so that the mineral filler formed after calcination has an excellent reinforcing effect on rubber, the prepared rubber has higher crushing strength, the prepared concrete has higher compressive strength, and the prepared pavement can bear larger weight and is favorable for traffic development.

Preferably, the mineral filler is prepared by compounding silica, argil, montmorillonite and kaolin and calcining at 1200-1400 ℃ for 3-4 h.

Through adopting above-mentioned technical scheme, through the special condition calcination back, the mineral filler that makes has stronger reinforcement effect to rubber for the rubber granule has higher crushing strength, thereby makes the ability that the rubber granule bore external force stronger, and the concrete that makes has better compressive strength.

Preferably, the particle size of the rubber particles is 15-20 mm.

Through adopting above-mentioned technical scheme, through selecting specific particle diameter scope for the rubber granule has suitable specific surface area and suitable deformation volume, makes the bonding effect of rubber granule and cement better, makes the concrete that makes simultaneously have suitable elastic deformation scope, is difficult for because of elastic deformation cracking.

Preferably, the additive is a compound of polyvinyl alcohol, sodium lignosulfonate, sodium nitrite, triisopropanolamine and sodium hexametaphosphate.

By adopting the technical scheme, the admixture is formed by compounding the polyvinyl alcohol, the sodium lignosulfonate, the sodium nitrite, the triisopropanolamine and the sodium hexametaphosphate, so that the concrete mixture has better processing performance, and the prepared concrete has higher strength and better quality.

Preferably, the mass ratio of the polyvinyl alcohol, the sodium lignosulfonate, the sodium nitrite, the triisopropanolamine and the sodium hexametaphosphate is 1: 0.3: 0.1: 0.8: 0.2.

by adopting the technical scheme, the concrete proportion is selected, so that the modification effect on cement is better, the compressive strength of the prepared concrete is better, and the quality is better.

In a second aspect, the present application provides a method for preparing a high-elasticity concrete for sound absorption on roads, which adopts the following technical scheme:

the preparation method of the high-elasticity concrete for road sound absorption comprises the following steps:

step 1), preparing rubber particles;

step 2), uniformly mixing water, cement, fly ash and an additive to obtain cement slurry;

step 3), putting the sand and the rubber particles into the cement slurry, and uniformly mixing to obtain a concrete mixture;

and 4), injecting the concrete mixture into a mould, curing, and demoulding to obtain the high-elasticity concrete for road sound absorption.

By adopting the technical scheme, the sand and the rubber particles are added at last, so that the modification effect of the admixture on the cement can be fully exerted, and the quality of the prepared concrete is better.

Preferably, the step 1) includes:

step 1-1), uniformly mixing silica, argil, montmorillonite and kaolin, and calcining at the temperature of 1200-1400 ℃ for 3-4h to prepare a mineral filler;

step 1-2), mixing natural rubber, styrene butadiene rubber, oil, hard carbon black, white carbon black, glass fiber, mineral filler, zinc oxide, stearic acid, paraffin, an anti-aging agent, an anti-scorching agent and a coupling agent to prepare master batch;

step 1-3), adding sulfur and an accelerator into the master batch, and mixing to obtain final rubber;

and 1-4), vulcanizing and cutting the final rubber compound to obtain rubber particles.

By adopting the technical scheme, the raw materials are uniformly dispersed through sectional mixing, the prepared rubber particles are uniform in quality, and after the rubber particles are filled into concrete, the concrete is uniform in quality and difficult to crack due to local weakness.

In summary, the present application has the following beneficial effects:

1. because the special rubber particles with specific proportion are doped, the compatibility of the rubber particles and cement is better, and the role of aggregate is better played, so that the prepared concrete has better elastic deformation capability and higher compressive strength, the prepared concrete pavement can bear the traffic of vehicles with larger load capacity, the applicability is wider, and the high-elasticity concrete for road sound absorption is easier to popularize and apply.

2. In this application preferably through silica, argil, montmorillonite, kaolin with specific proportion cooperation and through the special condition calcination after for the mineral filler who forms after the calcination has splendid reinforcement effect to rubber, and the rubber that makes has higher crushing strength, thereby makes the concrete that makes have higher compressive strength, and the road surface of making can bear bigger weight, is favorable to traffic development.

3. In the application, the additive is preferably formed by compounding polyvinyl alcohol, sodium lignosulfonate, sodium nitrite, triisopropanolamine and sodium hexametaphosphate, so that the concrete mixture has better processing performance, and the prepared concrete has higher strength and better quality.

Detailed Description

The present application will be described in further detail with reference to examples.

The information on the source of the raw materials used in the following examples and comparative examples is detailed in Table 1.

TABLE 1

Examples 1 to 3

A high-elasticity concrete for sound absorption of roads comprises the following components:

water, cement, fly ash, sand, stone, rubber particles and an additive.

Wherein the additive is sodium lignosulphonate.

Wherein the rubber particles comprise the following components:

natural rubber, styrene butadiene rubber, oil, hard carbon black, white carbon black, glass fiber, mineral filler, zinc oxide, stearic acid, paraffin, an anti-aging agent, a scorch retarder, a coupling agent, sulfur and an accelerator.

Wherein the mineral filler is prepared by compounding and calcining silica, argil, montmorillonite and kaolin, and the mass ratio of the silica to the argil to the montmorillonite to the kaolin is 1: 1.2: 0.3: 0.5.

in examples 1 to 3, the specific amounts (in kg) of the respective components in the high-elasticity concrete are shown in Table 2.

TABLE 2

	Example 1	Example 2	Example 3
				Water (W)	100	100	100
Cement	156	156.5	157
				Fly ash	31.5	31.8	32
Sand	442	446	448
				Stone (stone)	361	362	364
Rubber particles	361	362	364
				Additive agent	2.6	2.65	2.7

In examples 1 to 3, the specific amounts (in kg) of the respective components charged in the rubber pellets are shown in Table 3.

TABLE 3

In examples 1 to 3, a method for preparing a highly elastic concrete for road sound absorption comprises the steps of:

step 1), preparing rubber particles, specifically comprising:

step 1-1), uniformly mixing silica, argil, montmorillonite and kaolin, putting into a calcining furnace, and calcining for 4 hours at 1200 ℃ to obtain the mineral filler.

Step 1-2), putting natural rubber, styrene-butadiene rubber, glass fiber, mineral filler, zinc oxide, stearic acid, paraffin, an anti-aging agent, an anti-scorching agent and a coupling agent into an internal mixer, rotating at 40r/min, pressing and mixing for 30s, adding oil, pressing and mixing for 20s, adding hard carbon black and white carbon black, pressing and mixing for 30s, lifting bolt for 15s, rotating at 60r/min, pressing and mixing to 140 ℃ and 15s, pressing and mixing to 150 ℃ and keeping the temperature at 150 ℃ for 45s, lifting bolt for 10s and rotating at 45r/min, pressing and mixing to 156 ℃ and discharging to obtain the masterbatch.

And step 1-3), standing the master batch for 12 hours, putting the master batch into an open mill, dredging and mixing for 4 times, then putting sulfur and an accelerator into the master batch, dredging and mixing for 12 times, and discharging to obtain the final rubber.

And step 1-4), putting the final rubber compound into a mold, vulcanizing for 20min at 150 ℃ to form a vulcanized rubber sheet with the thickness of 20mm, and cutting to obtain rubber particles with the particle size of 20 mm.

And 2), putting water, cement, fly ash and the additive into a stirring kettle, stirring at the rotating speed of 40r/min for 1min, and uniformly mixing to obtain cement slurry.

And 3) putting the sand and the rubber particles into the cement slurry, stirring for 5min at the rotating speed of 25r/min, and uniformly mixing to obtain the concrete mixture.

And 4), injecting the concrete mixture into a mould, spraying water for curing for 3d, demoulding, standing and curing to 28d to obtain the high-elasticity concrete for road sound absorption.

Example 4

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

the preparation method of the high-elasticity concrete for road sound absorption comprises the following steps:

step 1-1), uniformly mixing silica, argil, montmorillonite and kaolin, putting into a calcining furnace, and calcining for 3 hours at 1400 ℃ to obtain the mineral filler.

Example 5

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

the preparation method of the high-elasticity concrete for road sound absorption comprises the following steps:

and step 1-4), putting the final rubber compound into a mold, vulcanizing for 16min at 150 ℃ to form a vulcanized rubber sheet with the thickness of 15mm, and cutting to obtain rubber particles with the particle size of 15 mm.

Example 6

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

in the rubber particles:

the mineral filler is prepared by compounding and calcining silica, argil, montmorillonite and kaolin, wherein the mass ratio of the silica to the argil to the montmorillonite to the kaolin is 1: 1: 1: 1.

example 7

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

the additive is a compound of polyvinyl alcohol, sodium lignosulfonate, sodium nitrite, triisopropanolamine and sodium hexametaphosphate, and the mass ratio of the polyvinyl alcohol, the sodium lignosulfonate, the sodium nitrite, the triisopropanolamine and the sodium hexametaphosphate is 1: 0.3: 0.1: 0.8: 0.2.

comparative example 1

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

the waste tires are crushed into waste rubber tire particles with the particle size of 20mm, and the rubber particles are replaced by the waste rubber tire particles in the same amount.

Comparative example 2

A highly elastic concrete for road sound absorption, which differs from example 2 only in that:

rubber particles were replaced by equal amounts of stone having an average particle size of 20 mm.

Experiment 1

The concrete samples prepared from the concrete mixture of each example and each comparative example were tested for 7-day compressive strength, 28-day split tensile strength and 28-day static compression elastic modulus according to standard GB/T50081-2016 of test method for mechanical properties of ordinary concrete.

Experiment 2

The crushing strength of rubber samples prepared from the final compounds obtained in examples and comparative examples was measured according to method for measuring crushing strength of hard rubber GB/T2438-1981.

The detailed data of experiments 1 and 2 are shown in Table 4.

TABLE 4

According to the comparison of the data of the example 2 and the comparative examples 1 and 2 in the table 4, the compression strength of the prepared concrete can be close to that of the common concrete only adopting the broken stones as the aggregates and is far higher than that of the concrete adopting the common waste rubber tire particles by adopting the special rubber particles, and therefore, the rubber particles prepared by adopting the special formula are very suitable for being used as concrete fillers, and the compression strength of the prepared concrete is greatly improved.

In addition, the elastic modulus of the concrete prepared by adding the special rubber particles is lower than that of the concrete only adopting the broken stones, so that the concrete has better elastic deformation, can better reduce noise generation, has higher driving comfort level and has better quality of the prepared pavement.

According to the comparison of the data of the example 2 and the example 6 in the table 4, when the silica, the argil, the montmorillonite and the kaolin are mixed according to a specific proportion, the crushing strength of the rubber particles can be better improved, so that the performance of the rubber particles is better, the prepared concrete has better elasticity and better compressive strength, and when the compressive strength is improved, the elastic modulus of the concrete is less changed, the influence on the elasticity of the concrete is lower, and the quality of the prepared pavement is better.

According to comparison of data of the embodiment 2 and the embodiment 7 in the table 4, after the admixture is prepared by mixing the polyvinyl alcohol, the sodium lignosulfonate, the sodium nitrite, the triisopropanolamine and the sodium hexametaphosphate in a specific ratio, the compressive strength of the prepared concrete is further improved, the modification effect on the cement is better, the quality of the prepared concrete is better, no obvious negative effect is caused on the elastic modulus of the concrete, and the prepared pavement has better quality.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. The utility model provides a high elasticity concrete for road inhales sound which characterized in that: the paint comprises the following components in parts by mass:

100 parts of water;

156 portions of cement and 157 portions;

31.5-32 parts of fly ash;

442-448 parts of sand;

361 and 364 portions of stone;

361 and 364 portions of rubber particles;

2.6-2.7 parts of an additive;

the rubber particles comprise the following components in parts by mass:

40-42 parts of natural rubber;

58-60 parts of styrene butadiene rubber;

5-8 parts of oil;

50-52 parts of hard carbon black;

20-22 parts of white carbon black;

10-11 parts of glass fiber;

44-45 parts of mineral filler;

3.3-3.7 parts of zinc oxide;

1.8-2.2 parts of stearic acid;

1.8-2.2 parts of paraffin;

1.1-1.2 parts of an anti-aging agent;

0.4-0.5 part of scorch retarder;

2-2.2 parts of a coupling agent;

1.1-1.2 parts of sulfur;

0.82-0.85 part of accelerator;

the mineral filler is prepared by compounding and calcining silica, argil, montmorillonite and kaolin.

2. The high-elasticity concrete for road sound absorption according to claim 1, wherein: the mass ratio of the silica, the argil, the montmorillonite and the kaolin is 1: 1.2: 0.3: 0.5.

3. the high-elasticity concrete for road sound absorption according to claim 2, wherein: the mineral filler is prepared by compounding silica, argil, montmorillonite and kaolin and calcining at 1200-1400 ℃ for 3-4 h.

4. The high-elasticity concrete for road sound absorption according to claim 1, wherein: the particle size of the rubber particles is 15-20 mm.

5. The high-elasticity concrete for road sound absorption according to claim 1, wherein: the additive is a compound of polyvinyl alcohol, sodium lignosulphonate, sodium nitrite, triisopropanolamine and sodium hexametaphosphate.

6. The high-elasticity concrete for road sound absorption according to claim 5, wherein: the mass ratio of the polyvinyl alcohol to the sodium lignosulfonate to the sodium nitrite to the triisopropanolamine to the sodium hexametaphosphate is 1: 0.3: 0.1: 0.8: 0.2.

7. a method for preparing a highly elastic concrete for sound absorption of roads according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:

step 1), preparing rubber particles;

step 2), uniformly mixing water, cement, fly ash and an additive to obtain cement slurry;

step 3), putting the sand and the rubber particles into the cement slurry, and uniformly mixing to obtain a concrete mixture;

and 4), injecting the concrete mixture into a mould, curing, and demoulding to obtain the high-elasticity concrete for road sound absorption.

8. The method for preparing the high-elasticity concrete for road sound absorption according to claim 7, wherein the method comprises the following steps: the step 1) comprises the following steps:

step 1-1), uniformly mixing silica, argil, montmorillonite and kaolin, and calcining at the temperature of 1200-1400 ℃ for 3-4h to prepare a mineral filler;

step 1-2), mixing natural rubber, styrene butadiene rubber, oil, hard carbon black, white carbon black, glass fiber, mineral filler, zinc oxide, stearic acid, paraffin, an anti-aging agent, an anti-scorching agent and a coupling agent to prepare master batch;

step 1-3), adding sulfur and an accelerator into the master batch, and mixing to obtain final rubber;

and 1-4), vulcanizing and cutting the final rubber compound to obtain rubber particles.