A construction process for seamless bonded concrete floor

Abstract

The present invention belongs to the field of construction, and specifically relates to a construction process for a seamless bonded concrete floor. The construction process for the seamless bonded concrete floor comprises the following steps: (1) base surface treatment: milling, soaking, and spraying an interface agent on the surface of an original structural plate to obtain a pre-treated base surface; (2) fixing: fixing reinforcing materials and auxiliary materials on the pre-treated base surface of step (1) to obtain a formwork layer; (3) molding: adding concrete to the formwork layer to obtain a concrete leveling layer, which is then cured and maintained. The floor obtained by the construction process disclosed in the present invention achieves seamless bonding, high compressive strength, low shrinkage, high stability, and is not prone to hollowing and cracking problems.

Description

Technical Field

[0001] The invention belongs to the field of construction, and particularly relates to a construction process for seamlessly bonded concrete floors. Background Art

[0002] With the rapid development of the national economy, underground garages, large industrial plants, logistics warehouses, and other facilities are increasingly emerging, placing increasingly stringent demands on floor smoothness and construction quality. Existing national standard leveling layers, often based on the national standard architectural atlas "12J304 Floor Construction," typically utilize a layer of cement slurry followed by a fine stone concrete screed. This often results in insufficient compressive strength, making concrete prone to hollowing and cracking, a difficult-to-avoid issue.

[0003] Invention patent CN102691401B discloses a construction method for large-area concrete floors. The construction steps are as follows: dividing the construction flow sections and construction separation joints, supporting the floor side formwork, installing force transmission rods at the intersection of the flow sections, setting up a laser leveler, fixing a leveling rod, selecting a leveling base point, pouring concrete in the space enclosed by the floor formwork, using the leveler to complete the vibration, compaction and leveling of the floor, completing the surface finishing and polishing of the concrete floor before the final setting of the concrete, maintaining the concrete floor, cutting the construction joints within 24 hours, filling the construction separation joints, and performing secondary maintenance. This invention solves the technical problem that the overall flatness of large-area floors is difficult to control, and solves the problem that the construction joints of large-area concrete floors are easily damaged, which increases the later maintenance costs and the use of formwork. It also solves the problems of the compartment joints on large-area concrete floors being damaged along the seams, the floor being prone to hollowing and cracking when cast in layers, and the like. However, this invention still belongs to the category of cut-slit bonding, and its integrity is relatively poor. There is still a possibility that the construction joints will cause reflective cracks in the concrete floor surface layer in the later stage, thereby causing the surface layer to crack.

[0004] In the existing technology, seamless floor construction technology has emerged. Its structure is mainly realized through two methods: steel fiber concrete and prestressed concrete. It can effectively improve the flatness of the concrete surface and reduce the occurrence of shrinkage stress cracks in the concrete floor. However, its process is relatively complex and costly, and is affected by the properties of the concrete itself. As a result, the shrinkage stability and compressive resistance of the seamless concrete floor still have room for improvement. Summary of the Invention

[0005] To overcome the shortcomings of the above-mentioned prior art, the present invention discloses a construction process for seamlessly bonded concrete floors. The flooring obtained by the construction process disclosed in the present invention achieves seamless bonding, high compressive strength, low shrinkage, high stability, and is less prone to hollowing and cracking.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a construction process for a seamless bonded concrete floor, the construction process for a seamless bonded concrete floor comprising the following steps:

[0008] (1) Base surface treatment: The original structural board surface is milled, soaked in water and sprayed with an interface agent to obtain a pre-treated base surface;

[0009] (2) Fixing: Fixing the reinforcement material and the auxiliary material on the pre-treated base surface in step (1) to obtain a mold layer;

[0010] (3) Molding: adding concrete to the formwork layer of step (2) to obtain a concrete leveling layer, vibrating, solidifying, and curing;

[0011] In the step (2), the reinforcing material and the auxiliary material are fixed with expansion bolts or embedded steel bars, and the distance between the pre-treated base surface and the reinforcing material is 0.8 to 1.2 m.

[0012] In some embodiments of the present invention, the original structural plate in step (1) is a reinforced concrete structural plate with a thickness of 50 to 90 mm.

[0013] In some embodiments of the present invention, the reinforcement material is 8@150 single-layer bidirectional steel bars, and the auxiliary material is a mixture of steel fibers and modified polypropylene fibers.

[0014] In some embodiments of the present invention, the amount of steel fiber added is 30-40 kg / m 2 The amount of modified polypropylene fiber added is 0.7-1.2 kg / m 2 .

[0015] In some embodiments of the present invention, the modified polypropylene fiber is prepared by the following steps:

[0016] A1: polypropylene fiber and 4-10 wt% hydrogen peroxide solution are stirred at 90-100° C. for 2-4 hours, followed by washing and drying to obtain pretreated polypropylene fiber;

[0017] A2: Under an inert atmosphere, vinyl triethoxysilane and 2-hydroxyethyl methacrylate were mixed and added toluene. The temperature was raised to 75-90°C, a catalyst was added, and the reaction was carried out for 1-2 hours. The modified agent was filtered, washed, and dried to obtain a modified agent. The modified agent was then mixed with anhydrous ethanol and stirred to obtain a 1-3 wt% modified solution.

[0018] A3: Immerse the pretreated polypropylene fiber in step A1 in the modifying solution in step A2, react for 3 to 5 hours, filter, wash and dry to obtain modified polypropylene fiber.

[0019] In some embodiments of the present invention, the mass ratio of vinyltriethoxysilane to 2-hydroxyethyl methacrylate in step A2 is 1:(0.5-1).

[0020] Preferably, in step A1, the length of the polypropylene fiber is 10-15 mm and the diameter is 20-35 μm.

[0021] In some embodiments of the present invention, the temperature of the concrete when it is added to the formwork layer in step (3) is ≥13°C.

[0022] In some embodiments of the present invention, the vibration in step (3) is manual vibration with an interval of 400 to 550 mm.

[0023] In some embodiments of the present invention, the curing is water curing and covering and insulation, the temperature difference between the curing water and the surface of the concrete leveling layer is ≤13°C, and the curing time is ≥14 days.

[0024] In some embodiments of the present invention, the concrete comprises the following raw materials in parts by weight: 300-340 parts of Portland cement, 1000-1200 parts of coarse aggregate, 700-790 parts of fine aggregate, 80-95 parts of fly ash, 5-13 parts of water reducer, 40-45 parts of expansive agent and 100-120 parts of water.

[0025] In some embodiments of the present invention, the coarse aggregate is crushed stone with a particle size of 5 to 25 mm.

[0026] In some embodiments of the present invention, the fine aggregate is manufactured sand.

[0027] In some embodiments of the present invention, the water reducer is a polycarboxylate water reducer with a water reduction rate greater than 25%.

[0028] In some embodiments of the present invention, the preparation steps of the expansion agent are as follows: β-cyclodextrin and water are mixed, and then fluorine-containing gypsum powder, magnesium oxide clinker and aluminum magnesium carbonate are added in sequence, the temperature is raised to 75-80°C, stirred for 6-9 hours, dried and ball-milled to obtain the expansion agent.

[0029] In some embodiments of the present invention, the mass ratio of the β-cyclodextrin, fluorinated gypsum powder, magnesium oxide clinker and hydrotalcite is (0.01-0.05): (0.7-0.9): 1: (0.1-0.3).

[0030] Preferably, the mass ratio of the β-cyclodextrin, fluorinated gypsum powder, magnesium oxide clinker and hydrotalcite is 0.03:0.8:1:0.2.

[0031] Preferably, the calcium sulfate content in the fluorine-containing gypsum powder is 85-90%, and the particle size is 150-200 meshes.

[0032] Preferably, the particle size of the magnesium oxide clinker is 0.5-1 μm.

[0033] In some embodiments of the present invention, the steps of preparing the concrete are as follows:

[0034] The concrete is obtained by mixing silicate cement, coarse aggregate, fine aggregate and fly ash, adding a premix of a water reducer, an expansive agent and water, and mixing them evenly.

[0035] On the one hand, the present invention discloses a new type of concrete construction process. Through special base surface treatment and bonding methods, combined with special reinforcement structure and fixing methods, by adding special coarse fiber steel fibers and fine fiber modified polypropylene fibers for mixing, seamless bonding of leveling layer concrete is achieved, effectively solving the problem of hollowing and plastic cracking easily occurring in large-area seamless bonded leveling concrete in the prior art.

[0036] The present invention first modifies the polypropylene fiber in the auxiliary material, introduces 2-hydroxyethyl methacrylate modified vinyl triethoxysilane as a modifier, and adopts wrapping immersion modification to modify the pretreated polypropylene fiber. On the one hand, the fineness and toughness of the network structure of the polypropylene fiber molding are increased, and it plays an effective bridging role between the cracks that may appear in the concrete floor. On the other hand, the rough surface of the modified polypropylene fiber and the tiny pores on the modified polypropylene fiber increase the contact area with the concrete, thereby jointly improving the bonding strength when it contacts the concrete, so that the comprehensive performance of the seamless bonded concrete floor is further improved.

[0037] In the prior art, shrinkage-reducing agents are often added to achieve a better shrinkage reduction effect. These agents reduce the autogenous and drying shrinkage of concrete by, for example, lowering the surface tension of the solution. However, these agents often require a large dosage, which can affect the concrete's compressive strength. Furthermore, compatibility with other admixtures in the concrete system must be considered. The present invention improves the concrete's formulation and mix ratio, adding a specially prepared expansive agent to effectively reduce concrete shrinkage, further addressing the issue of insufficient compressive strength after concrete flooring is formed. The possible reason is that the water replenishment effect brought about by the addition of the modifier β-cyclodextrin can promote the hydration of magnesium oxide, improve its early expansion efficiency at room temperature, and fully activate the self-activity of magnesium oxide. After the expansive agent comes into contact with water, it can also restore its layered structure through the memory effect of magnesium aluminum carbonate, significantly improving the expansion rate of the expansive agent, and then synergistically play a better role in compensating for autogenous shrinkage and drying shrinkage, thereby improving the functionality of the expansive agent, so that it still has a high shrinkage-expansion effect at a low dosage; on the other hand, the filling effect of the expansion product of the expansive agent can also compensate for the adverse effects of the modifier material on the compressive strength of concrete, thereby achieving a balance between shrinkage reduction and compressive strength.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The floor obtained by the construction process disclosed in the present invention achieves seamless bonding, high compressive strength, low shrinkage, high stability, and is not prone to hollowing and cracking problems.

[0040] 2. The new concrete construction process disclosed in the present invention achieves seamless bonding of the leveling layer concrete through special base surface treatment and bonding methods, combined with special reinforcement structure and fixing methods, by adding special coarse fiber steel fibers and fine fiber modified polypropylene fibers for mixing, effectively solving the problem of hollowing and plastic cracking easily occurring in large-area seamless bonded leveling concrete in the prior art.

[0041] 3. The present invention modifies the polypropylene fiber, on the one hand by increasing the fineness and toughness of the polypropylene fiber molding network structure, and on the other hand by improving its bonding strength when in contact with concrete, thereby further improving the comprehensive performance of the seamless bonded concrete floor.

[0042] 4. The present invention improves the formula and proportion of concrete and adds a specially prepared expansion agent to effectively reduce the shrinkage rate of concrete, further solves the problem of insufficient compressive strength of concrete floor after molding, and achieves a balance between anti-shrinkage and compressive strength. DETAILED DESCRIPTION

[0043] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples and comparative examples are intended only to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the scope of the present invention may be made without departing from the spirit or scope of the present invention.

[0044] In order to facilitate those skilled in the art to implement the present invention, some of the raw materials and manufacturers of the embodiments and comparative examples are described as follows:

[0045] Unless otherwise specified, the compounds and related reagents used in the following embodiments can be purchased from the market.

[0046] Unless otherwise specified, the particle size of the magnesium oxide clinker used in the following embodiments is 0.5-1 μm; the interface agents used are all emulsion-type interface agents purchased from Shenyang Hengdong Machinery Manufacturing Co., Ltd.; the calcium sulfate content of the fluorinated gypsum powder used is 85-90% and the particle size is 150-200 mesh; the coarse aggregate used is crushed stone with a particle size of 5-25 mm; the fine aggregate used is machine-made sand with a particle size of 40-70 mesh; the water reducers used are all polycarboxylic acid water reducers with a water reduction rate of >25%, purchased from Jinan Hongchuang Chemicals Co., Ltd.; the polypropylene fibers used are all 12 mm in length and 30 μm in diameter.

[0047] Unless otherwise specified, the post-processing steps such as "drying", "ball milling" and "mixing" used in the following embodiments are routine operations of those skilled in the art and can be selected according to actual operations.

[0048] Preparation Example 1

[0049] The preparation steps of the expansion agent are as follows:

[0050] Mix 0.3 g of β-cyclodextrin and 50 mL of water, then add 8 g of fluorinated gypsum powder, 10 g of magnesium oxide clinker and 2 g of hydrotalcite in sequence, heat to 78°C, stir for 7.5 h, dry and ball-mill to obtain an expansion agent.

[0051] Preparation Example 2

[0052] The specific preparation steps of the expander are the same as those in Preparation Example 1, except that the amount of β-cyclodextrin added is 0.6 g.

[0053] Preparation Example 3

[0054] The specific preparation steps of the expansion agent are the same as those in Preparation Example 1, except that the amount of hydrotalcite added is 3.5 g.

[0055] Preparation Example 4

[0056] The steps for preparing concrete are as follows:

[0057] In parts by weight, 320 parts of Portland cement, 1,100 parts of coarse aggregate, 750 parts of fine aggregate, and 90 parts of fly ash are mixed, and then a premix containing 9 parts of water reducer, 42.5 parts of expansive agent, and 110 parts of water is added and mixed evenly to obtain concrete.

[0058] The expansion agent used in this preparation example is obtained from Preparation Example 1.

[0059] Preparation Example 5

[0060] The specific preparation steps of the concrete are the same as those in Preparation Example 4, except that the expansion agent used in this Preparation Example is obtained from Preparation Example 2.

[0061] Preparation Example 6

[0062] The specific preparation steps of the concrete are the same as those in Preparation Example 4, except that the expansion agent used in this Preparation Example is obtained from Preparation Example 3.

[0063] Preparation Example 7

[0064] The specific preparation steps of the concrete are the same as those in Preparation Example 4, except that the expansion agent used in this Preparation Example is magnesium oxide clinker.

[0065] Preparation Example 8

[0066] The preparation steps of modified polypropylene fiber are as follows:

[0067] A1: Polypropylene fibers and a 6 wt% hydrogen peroxide solution were stirred at 95°C for 3 hours, followed by washing and drying to obtain pretreated polypropylene fibers;

[0068] A2: Under a nitrogen atmosphere, 5 g of vinyltriethoxysilane and 3.5 g of 2-hydroxyethyl methacrylate were mixed and added to 20 mL of toluene. The temperature was raised to 80°C, and 0.004 g of benzoyl peroxide was added. The mixture was reacted for 1.5 h. The modified agent was filtered, washed, and dried to obtain a modified solution. The modified solution was then mixed with anhydrous ethanol and stirred to obtain a 2 wt% modified solution.

[0069] A3: Immerse the pretreated polypropylene fiber in step A1 in the modifying solution in step A2, react for 4 hours, filter, wash and dry to obtain modified polypropylene fiber.

[0070] Preparation Example 9

[0071] The specific preparation steps of the modified polypropylene fiber are the same as those of Preparation Example 8, except that the amount of 2-hydroxyethyl methacrylate added in step A2 is 6 g.

[0072] Preparation Example 10

[0073] The specific preparation steps of the modified polypropylene fiber are the same as those of Preparation Example 8, except that in step A2, 3.5 wt% of the modified liquid is stirred.

[0074] Example 1

[0075] A construction process for seamless bonded concrete flooring includes the following steps:

[0076] (1) Base surface treatment: The surface of the reinforced concrete structural plate with a thickness of 70 mm was milled and soaked in water for 24 hours, and then sprayed with 1.8 kg / m 2 Interface agent, the base surface must be pretreated;

[0077] (2) Fixing: Lay 8@150 single-layer bidirectional steel bars at a distance of 1m from the pre-treated base surface of step (1) to form a bracket structure and fix it to the pre-treated base surface of step (1) with expansion bolts.2 Steel fiber and 1kg / m 2 Modified polypropylene fibers are laid in to obtain a mold layer;

[0078] (3) Molding: Concrete at a temperature of 13°C is heated at a rate of 2 kg / m 2 Add a concrete leveling layer on the formwork layer of step (2) at an interval of 480 mm and manually vibrate until the concrete surface stops sinking, let it stand for 28 days to solidify, then cure with water and cover and keep warm for 14 days to obtain the product;

[0079] It should be noted that the temperature difference between the curing water used in step (3) of this embodiment and the surface of the concrete leveling layer is 13°C.

[0080] The concrete used in this example is obtained from Preparation Example 4, and the modified polypropylene fiber used is obtained from Preparation Example 8.

[0081] Example 2

[0082] A construction process for seamless bonded concrete flooring includes the following steps:

[0083] (1) Base surface treatment: The surface of the reinforced concrete structural plate with a thickness of 50 mm was milled and soaked in water for 24 hours, and then sprayed with 1.8 kg / m 2 Interface agent, the base surface must be pretreated;

[0084] (2) Fixing: Lay 8@150 single-layer bidirectional steel bars at a distance of 0.8m from the pre-treated base surface of step (1) to form a support structure and fix it to the pre-treated base surface of step (1) with expansion bolts. 2 Steel fiber and 0.7kg / m 2 Modified polypropylene fibers are laid in to obtain a mold layer;

[0085] (3) Molding: Concrete at a temperature of 13°C is heated at a rate of 1.5 kg / m 2 Add a concrete leveling layer on the formwork layer of step (2) at intervals of 400 mm and manually vibrate until the concrete surface stops sinking, let it stand for 28 days to solidify, then cure with water and cover and keep warm for 14 days to obtain the product;

[0086] It should be noted that the temperature difference between the curing water used in step (3) of this embodiment and the surface of the concrete leveling layer is 13°C.

[0087] The concrete used in this example is obtained from Preparation Example 4, and the modified polypropylene fiber used is obtained from Preparation Example 8.

[0088] Example 3

[0089] A construction process for seamless bonded concrete flooring includes the following steps:

[0090] (1) Base surface treatment: The surface of the reinforced concrete structural plate with a thickness of 90 mm was milled and soaked in water for 24 hours, and then sprayed with 1.8 kg / m 2 Interface agent, the base surface must be pretreated;

[0091] (2) Fixing: Lay 8@150 single-layer bidirectional steel bars at a distance of 1m from the pre-treated base surface of step (1) to form a bracket structure and fix it to the pre-treated base surface of step (1) with expansion bolts. 2 Steel fiber and 1.2kg / m 2 Modified polypropylene fibers are laid in to obtain a mold layer;

[0092] (3) Molding: Concrete at a temperature of 13°C is heated at a rate of 2.5 kg / m 2 Add a concrete leveling layer on the formwork layer of step (2) at an interval of 550mm and manually vibrate until the concrete surface stops sinking, let it stand for 28 days to solidify, then cure with water and cover and keep warm for 14 days to obtain the product;

[0093] It should be noted that the temperature difference between the curing water used in step (3) of this embodiment and the surface of the concrete leveling layer is 13°C.

[0094] The concrete used in this example is obtained from Preparation Example 4, and the modified polypropylene fiber used is obtained from Preparation Example 8.

[0095] Example 4

[0096] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as that of Example 1, except that the concrete used is obtained from Preparation Example 5.

[0097] Example 5

[0098] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as Example 1, except that the concrete used is obtained from Preparation Example 6.

[0099] Example 6

[0100] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as Example 1, except that the concrete used is obtained from Preparation Example 7.

[0101] Example 7

[0102] A construction process for seamless bonded concrete flooring includes the following steps:

[0103] (1) Base surface treatment: The surface of the reinforced concrete structural plate with a thickness of 70 mm was milled and soaked in water for 24 hours, and then sprayed with 1.8 kg / m 2 Interface agent, the base surface must be pretreated;

[0104] (2) Fixing: Lay 8@150 single-layer bidirectional steel bars at a distance of 1m from the pre-treated base surface in step (1) to form a support structure and pour concrete at a temperature of 13°C at a rate of 1.5kg / m 2 Add the concrete leveling layer at intervals of 480mm and vibrate manually until the concrete surface stops sinking. Allow to stand and solidify for 28 days, then cure with water and cover and keep warm for 14 days.

[0105] It should be noted that the temperature difference between the curing water used in step (2) of this embodiment and the surface of the concrete leveling layer is 13°C.

[0106] The concrete used in this example was obtained from Preparation Example 4.

[0107] Example 8

[0108] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as Example 1, except that the modified polypropylene fiber used is obtained from Preparation Example 9.

[0109] Example 9

[0110] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as that of Example 1, except that the modified polypropylene fiber used is obtained from Preparation Example 10.

[0111] Example 10

[0112] A construction process for seamless bonded concrete flooring, the specific implementation method is the same as that of Example 1, except that an equal amount of polypropylene fiber is used to replace modified polypropylene fiber.

[0113] Performance testing:

[0114] 1. Anti-shrinkage performance

[0115] The shrinkage rates of the seamless bonded concrete floor specimens of each embodiment were tested on the 1st and 180th days with reference to the method described in 8.1 of GB / T 50082-2009 Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete. The ratio of the shrinkage rates on the 180th day to the 1st day of each embodiment was calculated and recorded as the relative shrinkage rate. The specimen size was 100 mm × 100 mm × 100 mm.

[0116] 2. Compressive strength

[0117] The compressive strength of the seamless bonded concrete floor specimens of each embodiment was tested with reference to the method described in GB / T 50081-2019 Standard for Test Methods of Physical and Mechanical Properties of Concrete. The specimen size was 100 mm × 100 mm × 515 mm.

[0118] The test results are shown in Table 1.

[0119] Table 1

[0120]

[0121]

[0122] It can be seen from Examples 1-3 in Table 1 that the jointless bonded concrete floor obtained by the construction process of the present invention has a low relative shrinkage rate, high stability, and high compressive strength; it can be seen from Example 4 compared with Example 1 that when the amount of β-cyclodextrin added is changed when preparing the expansion agent, the shrinkage resistance and compressive strength of the jointless bonded concrete floor are affected; it can be seen from Example 5 compared with Example 1 that when the amount of aluminum carbonate added is changed when preparing the expansion agent, the compressive strength of the jointless bonded concrete floor is reduced; it can be seen from Example 6 compared with Example 1 that when an equal amount of commercially available expansion agent is directly added to replace the expansion agent prepared by the present invention, the stability of the jointless bonded concrete floor is reduced, a large shrinkage occurs, and the problem of hollowing and cracking occurs; It can be seen that when the existing national standard atlas construction process is adopted, the compressive strength of the floor will be greatly reduced, and the seamless bonded concrete floor will be affected by shrinkage and hollow cracking will occur; compared with Example 1, Example 8 and Example 9, when the addition amount of 2-hydroxyethyl methacrylate and modifier in step A2 is changed when preparing modified polypropylene fiber, the effective bonding and filling effect may be reduced due to the influence of dispersed network clustering and the appearance of multiple weak interface layers, resulting in a decrease in the compressive strength of the seamless bonded concrete floor after formation; compared with Example 1, Example 10 shows that when the modified polypropylene fiber is replaced by an equal amount of polypropylene fiber, the compressive strength is insufficient, resulting in cracking of the seamless bonded concrete floor, thereby affecting the overall stability of the floor structure.

[0123] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A construction process for seamless bonded concrete flooring, characterized in that: The construction process of the seamless bonded concrete floor comprises the following steps: (1) Base surface treatment: The original structural board surface is milled, soaked in water and sprayed with an interface agent to obtain a pre-treated base surface; (2) Reinforcement and fixing: fixing the reinforcement material and auxiliary material on the pre-treated base surface in step (1) to obtain a mold layer; (3) Forming: adding concrete to the formwork layer of step (2) to obtain a concrete leveling layer, vibrating, solidifying, and curing; In the step (2), the reinforcement material and the auxiliary material are fixed with expansion bolts or planted steel bars, and the distance between the pre-treated base surface and the reinforcement material is 0.8 to 1.2 m; The reinforcement material is 8@150 single-layer bidirectional steel bars, and the auxiliary material is a mixture of steel fiber and modified polypropylene fiber; The preparation steps of the modified polypropylene fiber are as follows: A1: polypropylene fiber and 4-10 wt% hydrogen peroxide solution are stirred at 90-100° C. for 2-4 hours, followed by washing and drying to obtain pretreated polypropylene fiber; A2: Under an inert atmosphere, vinyl triethoxysilane and 2-hydroxyethyl methacrylate were mixed and added toluene. The temperature was raised to 75-90°C, a catalyst was added, and the reaction was carried out for 1-2 hours. The modified agent was filtered, washed, and dried to obtain a modified agent. The modified agent was then mixed with anhydrous ethanol and stirred to obtain a 1-3 wt% modified solution. A3: Immerse the pretreated polypropylene fiber in step A1 in the modification solution in step A2, react for 3 to 5 hours, filter, wash and dry to obtain modified polypropylene fiber; In step A2, the mass ratio of vinyltriethoxysilane to 2-hydroxyethyl methacrylate is 1:(0.5-1); The concrete comprises the following raw materials in parts by weight: 300-340 parts of Portland cement, 1000-1200 parts of coarse aggregate, 700-790 parts of fine aggregate, 80-95 parts of fly ash, 5-13 parts of water reducer, 40-45 parts of expansive agent and 100-120 parts of water; The preparation steps of the expansion agent are as follows: Mix β-cyclodextrin and water, then add fluorinated gypsum powder, magnesium oxide clinker and hydrotalcite in sequence, heat to 75-80° C., stir for 6-9 hours, dry and ball-mill to obtain the expansion agent; The mass ratio of the beta-cyclodextrin, fluorine-containing gypsum powder, magnesium oxide clinker and hydrotalcite is (0.01-0.05): (0.7-0.9): 1: (0.1-0.3).

2. The construction process of the seamless bonded concrete floor according to claim 1 is characterized in that: The original structural plate in step (1) is a reinforced concrete structural plate with a thickness of 50 to 90 mm.

3. The construction process of the seamless bonded concrete floor according to claim 1 is characterized in that: The amount of steel fiber added is 30-40 kg / m 2 The amount of modified polypropylene fiber added is 0.7-1.2 kg / m 2 .

4. The construction process of the seamless bonded concrete floor according to claim 1 is characterized in that: The curing is water curing and covering for insulation, the temperature difference between the curing water and the surface of the concrete leveling layer is ≤13°C, and the curing time is ≥14 days.

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