Light spray coating and construction process thereof

Abstract

The invention discloses a light spray coating and a construction process thereof. The light spray coating comprises 15-20% of cement, 15-20% of plant particles, 35-40% of building material particles, 15-18% of clay, 5-8% of siliceous superfine powder, 3-5% of cellulose, 3-5% of alumina micropowder and 0.02-0.05% of aluminum powder. The construction process comprises the following steps: S1, mixing and stirring the light spraying material, adding water accounting for about 3% of the total weight of the light spraying material for wetting, forming a semi-dry material, and filling the semi-dry material into a powder tank of a powder spraying machine; s2, a semi-dry method is adopted for spraying, the semi-dry material in the step S1 is fed into a muzzle of a powder spraying gun, atomized water is added into the muzzle, and the semi-dry material is sprayed to a construction part in the sequence of water first and material second; and rubber powder is added into the atomized water. The materials in the spray coating are simple and easy to obtain, the cost is low, the effects of comprehensive reinforcement and no influence on the internal ecology of the soil can be achieved, the construction is simple and rapid, and a construction foundation does not need to be built; the setting time is extremely short, and the construction period is not delayed; the terrain does not need to be considered, the construction surface is smooth, and the original construction part is not changed too much.

Description

Technical Field

[0001] The invention relates to the technical field of spray coatings and construction, in particular to a light spray coating and a construction process thereof. Background Art

[0002] During construction, especially in the construction of roads, rivers and tunnels, it is necessary to reinforce slope protection, earth dams or tunnel walls to prevent soil collapse. At present, collapse accidents occur frequently during construction. The reinforcement of these key parts plays a vital role in the construction and subsequent operation of the project. The most commonly used methods are anti-slide piles, anchor (cable) rods, lattice reinforcement, sprayed anchor net support and grouting reinforcement. Good results have been achieved in the prevention and control of collapse disasters, especially slope landslides with unloading cracks.

[0003] However, the traditional reinforcement scheme is more troublesome in construction, and requires a variety of raw materials, which is expensive and labor-intensive. In terms of installation, it is also necessary to consider the terrain and the installation foundation, which cannot achieve the effect of fast construction and convenient construction. In addition, for construction sites that require comprehensive reinforcement due to the rainy environment and serious soil erosion, the existing reinforcement methods have long been unable to meet the needs. A reinforcement method that can fully reinforce without affecting the internal ecology of the soil is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a lightweight spray coating and its construction process to solve the problem that traditional reinforcement schemes are troublesome in construction, expensive, and fail to achieve comprehensive reinforcement without affecting the internal ecology of the soil.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A light spray coating comprises 15-20% cement, 15-20% plant particles, 35-40% building material particles, 15-18% clay, 5-8% siliceous superfine powder, 3-5% cellulose, 3-5% alumina micropowder and 0.02-0.05% aluminum powder.

[0007] A further technical solution is: 18% cement, 16% plant particles, 36% building material particles, 16% clay, 5.96% siliceous ultrafine powder, 4% cellulose, 4% alumina powder and 0.04% aluminum powder.

[0008] A further technical solution is that the mesh size of plant particles, building material particles and clay is 0 to 3 mm.

[0009] A construction process of a lightweight spray coating, using the lightweight spray coating, comprises the following steps:

[0010] S1. First, mix and stir the lightweight spray paint, and after stirring evenly, add water accounting for about 3% of the total weight of the lightweight spray paint to moisten it, and form a semi-dry material and load it into the powder tank of the powder spray machine;

[0011] S2, using semi-dry spraying, using air pressure, the semi-dry material in S1 is sent to the muzzle of the powder spray gun, and mist water is added at the muzzle position, and sprayed to the construction site in the order of water first and then material;

[0012] Rubber powder is added to the atomized water.

[0013] A further technical solution is that the mass percentage of the total weight of the atomized water and the light spray material is 12-15%, and the semi-dry material is sprayed evenly and adheres to the construction site with water.

[0014] A further technical solution is: in S2, the spraying area of ​​the atomized water on the construction site is larger than the spraying area of ​​the semi-dry material on the construction site.

[0015] A further technical solution is that the semi-dry material in S2 needs to be sprayed within five minutes and sprayed at least twice.

[0016] A further technical solution is: in S2, according to different requirements of the construction site, appropriate anchoring treatment can be performed on the construction site.

[0017] A further technical solution is: in S2, the spraying angle is controlled to control the rebound amount, and the spraying direction is perpendicular to the construction site.

[0018] A further technical solution is: in S2, a negative pressure exhaust hood connected to an external negative pressure device is installed at the muzzle of the powder spray gun, and the caliber of the negative pressure exhaust hood is not less than the spraying area of ​​the muzzle of the powder spray gun.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] The present invention proposes a lightweight spray coating, which has simple and easy-to-obtain materials and low cost. The introduction of building material particles can greatly reduce the cost of the materials. At the same time, the components can be refined with the help of cement and ultrafine silicon powder, and a hard and high-strength reinforcement layer can be obtained after solidification to protect the construction site. The aluminum powder and water in the material undergo an exothermic reaction. On the one hand, bubbles formed by the release of hydrogen produce air holes on the reinforcement layer, and on the other hand, plant particles are used to carbonize to obtain micropores, which mainly play a role in improving the air permeability of the reinforcement layer to ensure the ecology of the soil inside and reduce the density of the reinforcement layer. The aluminum oxide powder can increase the activity of other materials, promote the reaction speed, and with the synergistic effect of high temperature, greatly shorten the solidification time.

[0021] The construction process of this lightweight spray paint only requires spraying, and the construction is simple and quick. First, there is no need to build a construction foundation; second, the construction is extremely fast and the solidification time is extremely short, which does not delay the construction period; third, there is no need to consider the terrain, and any shape of the construction site can be sprayed; fourth, the construction surface is flat, and the original construction site will not be changed too much. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0023] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0025] Embodiment 1:

[0026] A light spray coating comprises 15-20% cement, 15-20% plant particles, 35-40% building material particles, 15-18% clay, 5-8% siliceous superfine powder, 3-5% cellulose, 3-5% alumina micropowder and 0.02-0.05% aluminum powder.

[0027] Preferably, the mesh size of the plant particles, building material particles and clay is 0 to 3 mm.

[0028] Experimental component 1: cement 18%, plant particles 16%, building material particles 36%, clay 16%, siliceous ultrafine powder 5.96%, cellulose 4%, alumina micropowder 4% and aluminum powder 0.04%.

[0029] Experimental component 2: cement 18%, plant particles 20%, building material particles 35%, clay 17%, siliceous ultrafine powder 5.95%, cellulose 4%, alumina micropowder 3% and aluminum powder 0.05%.

[0030] Experimental component 3: cement 19%, plant particles 15%, building material particles 39%, clay 15%, siliceous ultrafine powder 5.95%, cellulose 3%, alumina powder 3% and aluminum powder 0.05%.

[0031] Experimental component 4: cement 17%, plant particles 20%, building material particles 36%, clay 15%, siliceous ultrafine powder 5.98%, cellulose 3%, alumina micropowder 3% and aluminum powder 0.02%.

[0032] Experimental component 5: cement 15%, plant particles 15%, building material particles 40%, clay 18%, siliceous ultrafine powder 5.98%, cellulose 3%, alumina micropowder 3% and aluminum powder 0.02%.

[0033] Performance Testing

[0034] The materials in experimental components 1-5 were mixed separately, and then poured into 4cm*4cm*16cm molds respectively. Then, the solidification time was observed and recorded. Finally, the density, compressive strength, flexural strength and water absorption were tested respectively. The water absorption rate was calculated as follows: weigh the sample and then immerse it completely in water for 5 minutes, then take it out, wipe off the water and weigh it again, and calculate the ratio of the increased weight to the original weight.

[0035] Table 1. Performance test results

[0036] <![CDATA[Density (kg / m 3 )]]> Final setting time (h) Compressive strength(MPa) Flexural strength(MPa) Water absorption (%) Component 1 2.1 6.9 13.3 5.6 0.14 Component 2 1.6 6.4 12.6 4.9 0.16 Component 3 2.3 7.6 13.5 5.8 0.11 Component 4 1.8 7.1 13.2 5.5 0.13 Component 5 2.2 7.8 12.8 5.1 0.09

[0037] It can be seen from Table 1 that component 3 has the best strength performance, the highest density, and the lowest water absorption rate, because more cement and building material particles are used; component 2 has the highest water absorption rate, more aluminum powder and plant particles, and more pores and holes, which can absorb and hold more water and have good air permeability; components 1 and 4 have better comprehensive performance and are suitable for production as general products.

[0038] The various raw materials in the spray coating material are common, easy to obtain, and low in cost; the introduced building material particles can greatly reduce the cost of the material, and at the same time, the components can be refined with the help of cement and silicon ultrafine powder, and a hard and high-strength reinforcement layer can be obtained after solidification to protect the construction site; the aluminum powder and water in the material undergo an exothermic reaction, on the one hand, hydrogen is released to form bubbles that produce air holes on the reinforcement layer, and on the other hand, it is used to carbonize plant particles to obtain micropores, which mainly play a role in the air permeability of the reinforcement layer to ensure the ecology of the soil inside and reduce the density of the reinforcement layer. Alumina micropowder can increase the activity of other materials, promote the reaction speed, and greatly shorten the solidification time with the synergistic effect of high temperature. Moreover, the introduced plant particles will gradually carbonize or pulverize with the change of time, fully play the role of filling strength, reducing dead weight, and using the passage of time in nature to complete the change of structure, meeting the role of carbon-free emissions and energy saving and consumption reduction. The aluminum material in this material can also meet the material properties with small conditions such as wear resistance. Increase the strength of loose surfaces, protect the safety of construction sites (tunnels, mines), have ecological functions, are light in weight, high in strength, breathable, and water-absorbent. Appropriate introduction of construction waste has the advantage of reusing renewable resources.

[0039] Embodiment 2:

[0040] A construction process of a lightweight spray coating, using the lightweight spray coating, comprises the following steps:

[0041] S1. First, mix and stir the lightweight spray paint, and after stirring evenly, add water accounting for about 3% of the total weight of the lightweight spray paint to moisten it, and form a semi-dry material and load it into the powder tank of the powder spray machine;

[0042] S2, using semi-dry spraying, using air pressure, the semi-dry material in S1 is sent to the muzzle of the powder spray gun, and mist water is added at the muzzle position, and sprayed to the construction site in the order of water first and then material;

[0043] Rubber powder is added to the atomized water.

[0044] First, mix and stir all the materials, and after stirring evenly, add about 3% water to moisten them. The main purpose is to reduce dust during construction. Use the semi-dry spraying method, with the help of the existing powder spraying machine, use air pressure to send the materials to the spray gun muzzle, add mist water at the muzzle position, and spray it evenly and instantly under the pressure of air, and spray it to the construction site. Since the water mist dries quickly and has a relatively low adhesion, an appropriate amount of glue powder can be added to the water body that forms the atomized water to improve the adhesion of the atomized water at the construction site, as well as the adhesion of the semi-dry powder on the atomized water, and the atomized water formed by the glue powder can play a certain role in water retention. The construction process of this lightweight spray coating only needs to be sprayed, and the construction is simple and fast. First, there is no need to build a construction foundation; second, the construction is extremely fast and the solidification time is extremely short, which does not delay the construction period; third, regardless of the terrain, any shape of the construction site can be sprayed; fourth, the construction surface is flat and the original construction site will not be changed too much.

[0045] Preferably, the mass percentage of the total weight of the atomized water and the lightweight spray coating is 12-15%, and the semi-dry material is sprayed evenly and adheres to the construction site with water.

[0046] Do not use too much atomized water, otherwise the semi-dry material will easily flow away from the construction site and fail to achieve the adhesion effect.

[0047] Preferably, in S2, the spraying area of ​​the atomized water on the construction site is larger than the spraying area of ​​the semi-dry material on the construction site.

[0048] The spray coverage area of ​​the atomized water is large enough, which greatly reduces the phenomenon of semi-dry powder falling and being wasted due to lack of water and inability to adhere.

[0049] Preferably, the semi-dry material in S2 needs to be sprayed within five minutes and sprayed at least twice.

[0050] The first coat of spraying may cause the problem of not being able to fully cover the reinforcement construction site due to the lack of blank shapes. Spraying on both sides can greatly avoid the phenomenon of blank spraying and ensure the reinforcement effect. Pay attention to the time interval between the two sprayings, and start the second spraying when the surface of the last spraying hardens.

[0051] Preferably, in S2, anchoring treatment may be appropriately performed on the construction site according to different requirements of the construction site.

[0052] Anchoring treatment is also called roughening treatment. For some relatively smooth construction surfaces, roughening treatment can be done to facilitate the adhesion of spray paint.

[0053] Preferably, in S2, the spraying angle is controlled to control the rebound amount, and the spraying direction is perpendicular to the construction site.

[0054] The vertical spraying method can reduce the scattering of semi-dry materials.

[0055] Preferably, in S2, a negative pressure exhaust hood connected to an external negative pressure device is installed at the muzzle of the powder spray gun, and the caliber of the negative pressure exhaust hood is not less than the spraying area of ​​the muzzle of the powder spray gun.

[0056] With the help of the negative pressure exhaust hood under the action of the negative pressure equipment, it can not only remove dust, but also recover the rebound material for reuse.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lightweight spray coating, characterized in that: Cement 15-20%, plant particles 15-20%, building material particles 35-40%, clay 15-18%, siliceous ultrafine powder 5-8%, cellulose 3-5%, alumina powder 3-5% and aluminum powder 0.02-0.05%.

2. The lightweight spray coating according to claim 1, characterized in that: Cement 18%, plant particles 16%, building material particles 36%, clay 16%, siliceous ultrafine powder 5.96%, cellulose 4%, alumina powder 4% and aluminum powder 0.04%.

3. The lightweight spray coating according to claim 1, characterized in that: The mesh size of plant particles, building material particles and clay is 0 to 3 mm.

4. A construction process for a lightweight spray coating, characterized in that: Using the lightweight spray coating as described in any one of claims 1 to 3 comprises the following steps: S1. First, mix and stir the lightweight spray paint, and after stirring evenly, add water accounting for about 3% of the total weight of the lightweight spray paint to moisten it, and form a semi-dry material and load it into the powder tank of the powder spray machine; S2, using semi-dry spraying, using air pressure, the semi-dry material in S1 is sent to the muzzle of the powder spray gun, and mist water is added at the muzzle position, and sprayed to the construction site in the order of water first and then material; Rubber powder is added to the atomized water.

5. The construction process of the lightweight spray coating according to claim 4 is characterized in that: In S2, the mass percentage of the total weight of the atomized water and the lightweight spray material is 12-15%, and the semi-dry material is sprayed evenly and adheres to the construction site with water.

6. The construction process of the lightweight spray coating according to claim 4 is characterized in that: In S2, the spraying area of ​​the atomized water on the construction site is larger than the spraying area of ​​the semi-dry material on the construction site.

7. The construction process of the lightweight spray coating according to claim 4 is characterized in that: The semi-dry material in S2 needs to be sprayed within five minutes and sprayed at least twice.

8. The construction process of the lightweight spray coating according to claim 4 is characterized in that: In S2, anchoring treatment may be appropriately performed on the construction site according to different requirements of the construction site.

9. The construction process of the lightweight spray coating according to claim 4 is characterized in that: In S2, the spraying angle is controlled to control the rebound amount, and the spraying direction is perpendicular to the construction site.

10. The construction process of the lightweight spray coating according to claim 4, characterized in that: In S2, a negative pressure exhaust hood connected to an external negative pressure device is installed at the muzzle of the powder spray gun, and the caliber of the negative pressure exhaust hood is not less than the spraying area of ​​the muzzle of the powder spray gun.