CN115852992A - Waste tire-pervious concrete composite structure and preparation method and application thereof - Google Patents

Abstract

The invention belongs to the technical field of solid waste utilization and ecological engineering construction, and discloses a waste tire-permeable concrete composite structure and its preparation method and application. The composite structure includes waste tires and permeable concrete; the waste tires are whole tires or half tires cut along the circumferential direction of the whole tire, and permeable concrete is poured in the cavities formed inside the waste tires and on the inner ring side of the tires. The invention uses waste tires as templates for forming permeable concrete, and combines the two to form a rigid-flexible composite structure, which is applied to slope support and leisure trails, not only meeting the requirements of engineering strength and stability, but also exerting The utilization value of solid waste such as waste tires.

Description

A waste tire-permeable concrete composite structure and its preparation method and application

technical field

The invention belongs to the technical field of solid waste utilization and ecological engineering construction, and specifically relates to a waste tire-permeable concrete composite structure and its preparation method and application.

Background technique

Scrap tires are a large amount of waste in the field of transportation engineering. Improper disposal will bring serious environmental problems and waste of resources. A large number of automobile tires are discarded every year in our country, and the commonly used disposal methods are refurbishment, hoarding, incineration and landfill. The hoarding of discarded tires will lead to the breeding of diseases and insect pests, while incineration will release toxic smoke and bury hidden dangers for fires, and directly burying discarded tires will also pollute groundwater. The current comprehensive utilization rate of tires in our country is less than 50%, and the comprehensive utilization has great prospects.

In recent years, ecological engineering construction has become an important link in urban construction, including projects such as slope support and leisure trail construction. These projects are an important measure to improve the urban ecological environment, enhance the urban green level, and enrich the urban green landscape. . Traditional slope support and leisure trail construction mostly use hard materials such as steel bars, masonry, concrete, etc., which not only requires high cost, but also for the support of weathered rocky slopes, the weathered spalling and accumulation on the slope surface Water collapse poses great challenges to the construction and durability of rigid materials. Therefore, the present invention proposes a waste tire-permeable concrete composite structure, which is applied to slope support and leisure trails. Harmonization of benefits.

Contents of the invention

The technical problem to be solved by the present invention is to provide a waste tire-permeable concrete composite structure and its preparation method and application in view of the low utilization rate of waste tires in my country and the problems existing in traditional slope support and leisure trail construction. The formwork formed by permeable concrete, the combination of the two forms a rigid-flexible composite structure, which is used in slope support and leisure trails. It can not only meet the requirements of engineering strength and stability, but also play the role of solid waste such as waste tires. use value.

In order to solve the technical problems proposed by the present invention, the present invention provides a waste tire-permeable concrete composite structure, including waste tires and permeable concrete; waste tires are whole tires or half tires cut along the circumferential direction of the whole tire. The cavity formed inside the tire and the inner ring side of the tire is poured with permeable concrete.

In the above scheme, the waste tires are one of car tires, bus tires, and truck tires, and the heights of the waste tires used are consistent.

In the above scheme, the permeable concrete is a permeable concrete made of at least one of Portland cement, sulphoaluminate cement, aluminate cement, emulsified asphalt, and silicon-aluminum industrial waste as a cementitious material.

In the above scheme, the raw materials and mass parts of the permeable concrete include: 1412-1669 parts of coarse aggregate, 343-400 parts of cementitious material, 100-126 parts of water, 7.4-8.7 parts of water-reducing agent, and water-cement ratio of 0.28 -0.42.

The present invention also provides a method for preparing a waste tire-permeable concrete composite structure, comprising the following steps:

1) In a mixing container, mix coarse aggregate and 40-60% water and stir evenly, then add all raw materials except water and stir evenly again, finally add the remaining water and stir evenly to obtain permeable concrete;

2) Place the waste tires on a plane, pour permeable concrete into the cavity formed inside the waste tires and the inner ring side of the tires, and after the pouring is completed, cure and shape to obtain a waste tire-permeable concrete composite structure.

In the above scheme, the curing conditions: temperature 20±2°C, relative humidity ≥ 95%, curing for 7-28 days.

The invention also provides an application of a waste tire-permeable concrete composite structure, and the composite structure is applied to slope support or leisure trails.

In the above scheme, when the composite structure is applied to slope support, the waste tires in the composite structure are half tires cut along the circumferential direction of the whole tire, and the arrangement of the composite structure on the slope surface is as follows: The connecting lines of the centers of the three composite structures form an equilateral triangle, and the close contact between the composite structures forms a tightly interlocked structure.

Further, the obstacles and pumice pumice on the slope of the slope should be cleaned up in advance.

Further, when the composite structure is applied to soil slope support, permeable concrete is also poured in the interlocking spaces between the composite structures.

Further, when the composite structure is applied to soil slope support, at least one of shrubs, grass seeds, and vines is planted in the permeable concrete to green the slope.

Further, when the composite structure is applied to rocky slope support, vines are planted in the soil around the slope, and the vines are pulled to the slope to green the slope.

In the above scheme, when the composite structure is applied to leisure trails, the waste tires in the composite structure are whole tires or half-cut tires cut along the circumferential direction of the whole tire, and the composite structures are arranged and placed on the base layer according to the predetermined track of the trail , forming a leisure trail for pedestrians to walk on.

Further, the distance between the composite structures in the leisure walkway is ≤20cm.

Compared with prior art, the beneficial effect of the present invention is:

1) The waste tire-permeable concrete composite structure of the present invention is a rigid-flexible composite structure. The waste tire provides a template and a flexible connection for the permeable concrete. The permeable concrete has the characteristics of high strength and good durability. The combination of the two The formed structure has very reliable stability and can meet the requirements of slope support and leisure trails; at the same time, permeable concrete also has good water permeability and large porosity to ensure the needs of water infiltration and plant growth. It solves the problems of water accumulation on leisure trails and weathered stone slopes. On the other hand, green plants can be planted and greened in the soil covered by permeable concrete, so as to realize the coordination and unity of function and environment.

2) The present invention solves the problem of disposal of waste tires, so that a large number of waste tires can be well utilized in slope support work, greatly improving the utilization rate of waste tires; permeable concrete can be prepared from solid waste, and can be Realizing the resource utilization of various solid wastes has important economic and environmental benefits.

3) The construction method involved in the present invention is convenient, the construction cost is low, and it is easy to popularize.

Description of drawings

Fig. 1 is a structural schematic diagram of the composite structure of Example 1 and Example 2 of the present invention.

Fig. 2 is a structural schematic diagram of the composite structure of Example 3 and Example 4 of the present invention.

Fig. 3 is a structural schematic diagram of the application example 1 of the present invention when the composite structure is applied to rock slope support.

Fig. 4 is a structural schematic diagram of the application example 2 of the present invention when the composite structure is applied to soil slope support.

Fig. 5 is a structural schematic diagram of the application example 3 of the present invention when the composite structure is applied to a leisure trail.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

In the following examples, the discarded tires used are car tires. The Portland cement, sulphoaluminate cement, slag powder and fly ash used are all from Wuhan Huaxin Cement Co., Ltd.; the steel slag is converter steel slag produced by Fuping (thermal braising method), and its particle size is 0-30mm; the coarse bone The material comes from Wuxue Huaxin Aggregate Co., Ltd., with an apparent density of 2745kg/m ³ and a crushing index of 9.7%; the water reducing agent is Wuhan Youbolin Polycarboxylate Superplasticizer with a water reducing rate of 28%.

The main chemical components (wt%) of each raw material of table 1

raw material SiO₂ Al₂O₃ Fe₂O₃ CaO MgO Na₂O P₂O₅ K₂O TiO₂ SO₃ Portland cement 21.57 6.53 5.36 59.95 3.17 - - - - 1.8 Sulphoaluminate cement 9.46 32.46 2.86 42.23 2.49 - - - 1.59 7.89 steel slag 15.57 3.90 23.87 36.45 7.27 0.22 2.21 - 1.46 0.73 Slag powder 30.34 13.88 0.592 38.45 8.255 0.611 - 0.558 0.809 2.854 fly ash 46.97 35.09 5.05 4.82 0.69 - - - 1.61 3.52

Example 1-4

A waste tire-permeable concrete composite structure, including waste tires and permeable concrete; wherein, the composite structure of Embodiment 1 and Embodiment 2 is shown in Figure 1, and the waste tire is a half tire cut along the circumferential direction of the whole tire; The composite structure of Example 3 and Example 4 is shown in Figure 2. The waste tire is a whole tire; the cavity formed inside the waste tire and the inner ring side of the tire is poured with permeable concrete. The composition of the permeable concrete is shown in Table 2.

The composition (mass parts) of table 2 embodiment 1-4 permeable concrete

The preparation method of waste tire-permeable concrete composite structure in embodiment 1-4 comprises the following steps:

1) In the mixing container, mix the coarse aggregate and 50% water and stir evenly, so that the surface of the coarse aggregate can be effectively cleaned, which is conducive to the bonding of the coarse aggregate and the cementitious material slurry, and avoids the formation of low-strength adhesive Tie the transition zone; then add all the raw materials except water and stir evenly again, which helps to form a slurry with good consistency, which acts as a lubricant between the aggregates, prevents the aggregates from being crushed, is conducive to stirring, and can ensure porosity ; Finally, add the remaining water and stir evenly to form a slurry with suitable fluidity, which is evenly wrapped on the surface of the coarse aggregate, increasing the bonding area between the coarse aggregate, which not only ensures the connected porosity of the permeable concrete, but also improves The strength is improved, the overall stability of the structure is also improved, and permeable concrete is obtained;

2) Place the waste tires on a plane, pour permeable concrete into the cavity formed inside the waste tires and the inner ring side of the tires, after pouring is completed, under the conditions of temperature 20±2°C and relative humidity ≥95%, curing for 7- After 28 days of hardening and molding, a waste tire-permeable concrete composite structure is obtained.

The performance of permeable concrete in the composite structure is tested, and the compressive strength is tested with reference to GB/T 50081-2019 "Standards for Test Methods of Physical and Mechanical Properties of Concrete"; the porosity is tested by the volume method; the permeability coefficient is tested by the porous concrete permeability meter; the results are shown in table 3.

The performance test result of table 3 embodiment 1-4 permeable concrete

As can be seen from the results of table 3, the 7d and 28d compressive strengths of embodiment 1-4 pervious concrete are all higher than 5.6MPa, which can meet the strength requirements of slope protection and leisure trails; the porosity is 14.3-20.5%, which can fully The function of water permeability and plant growth; the permeability coefficient is 4.2-7.1mm/s, which can realize rapid drainage without water accumulation. To sum up, the permeable concrete of each embodiment can meet the application requirements, and in actual application, it can be selected according to the actual situation.

Application example 1

The waste tire-permeable concrete composite structure in Example 1 is applied to rocky slope support, and the application method is: pre-clear the obstacles and pumice pumice on the slope surface, and then arrange them on the slope surface Composite structures, as shown in Figure 3, are arranged in such a way that the composite structures are arranged on the slope surface: the connecting lines of the centers of every three composite structures form an equilateral triangle, and the close contact between the composite structures forms a tightly interlocked structure , and so on, until the entire slope support is completed. Plant vines in the soil around the slope, and pull the vines to the slope to green the slope.

Application example 2

The waste tire-permeable concrete composite structure of Example 2 is applied to soil slope support, and the application method is as follows: the obstacles and floating soil and pumice on the slope surface are cleaned up in advance, and then the composite structure is arranged on the slope surface. As shown in Figure 4, the arrangement of composite structures on the slope surface is as follows: the center line of every three composite structures forms an equilateral triangle, and the composite structures are in close contact to form a tightly interlocked structure. Pouring permeable concrete in the interlocking gap, and so on, until the entire slope support is completed. Plant shrubs, grass seeds or vines in pervious concrete to green slopes.

Application example 3

The waste tire-permeable concrete composite structure of Example 3 is applied to the leisure trail. The application method is as follows: as shown in Figure 5, the composite structure is arranged on the base layer according to the predetermined trajectory of the trail, and the distance between the composite structures is ≤ 20cm. Constitute a leisure trail for pedestrians to walk on.

The above-mentioned embodiments are merely examples for clear illustration, and are not intended to limit the implementation. For those of ordinary skill in the art, on the basis of the above description, other different forms of changes or changes can be made, and it is not necessary and impossible to exhaustively list all the implementation modes here, and the obvious changes or Changes are still within the protection scope of the present invention.

Claims (10)

1. A scrap tire-pervious concrete composite structure is characterized by comprising a scrap tire and pervious concrete; the waste tire is a whole tire or a half tire split along the circumferential direction of the whole tire, and pervious concrete is poured in cavities formed in the waste tire and on the inner ring side of the tire.

2. The scrap tire-pervious concrete composite structure of claim 1, wherein the scrap tire is one of a passenger car tire, or a truck tire.

3. The scrap tire-pervious concrete composite structure according to claim 1, wherein the pervious concrete is a pervious concrete made of at least one of portland cement, sulphoaluminate cement, aluminate cement, emulsified asphalt and alumino-silicate industrial waste residues as a cementitious material.

4. A method for preparing a scrap tire-pervious concrete composite structure according to any one of claims 1 to 3, comprising the steps of:

1) Mixing the coarse aggregate and 40-60% of water in a stirring container, uniformly stirring, adding all the raw materials except water, uniformly stirring again, adding the rest water, and uniformly stirring to obtain the pervious concrete;

2) And placing the waste tire on a plane, pouring pervious concrete into a cavity formed in the waste tire and on the inner ring side of the tire, and curing and forming after pouring to obtain the waste tire-pervious concrete composite structure.

5. Use of the scrap tire-pervious concrete composite structure according to claim 1, wherein the composite structure is used in slope support or leisure walks.

6. The use of the scrap tire-pervious concrete composite structure according to claim 5, wherein when the composite structure is applied to slope support, the scrap tire in the composite structure is a half tire split along the circumferential direction of the whole tire, and the arrangement mode of the composite structure on the slope surface of the slope is as follows: the central connecting lines of every three composite structures form an equilateral triangle, and the composite structures are closely contacted to form a tightly-embedded and locked structure.

7. The use of a scrap tire-pervious concrete composite structure according to claim 6, wherein when the composite structure is used in soil slope support, pervious concrete is also poured in the interlocking gaps between the composite structures.

8. The use of the scrap tire-pervious concrete composite structure according to claim 6, wherein the slope is greened by planting at least one of shrubs, grass seeds and vines in the pervious concrete when the composite structure is applied to soil slope support.

9. The use of the scrap tire-pervious concrete composite structure according to claim 6, wherein when the composite structure is used for rocky slope support, the vines are planted in soil around the slope, and are drawn to the slope surface to green the slope surface.

10. The use of the scrap tire-pervious concrete composite structure according to claim 5, wherein when said composite structure is applied to a leisure walkway, the scrap tire in the composite structure is a whole tire or a half tire split along the circumferential direction of the whole tire, and the composite structure is sequentially arranged on a base layer according to the determined track of the walkway to form the leisure walkway for pedestrians to walk.

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