Construction technology of non-kerf bonding concrete terrace

Abstract

The invention belongs to the field of buildings, and particularly relates to a construction process of a non-kerf bonding concrete terrace, which comprises the following steps: (1) base surface treatment: milling, soaking and spraying an adhesion agent on the surface of an original structural slab to obtain a pretreated base surface; (2) fixing: fixing a reinforced material and an auxiliary material on the pretreated base surface in the step (1) to obtain a mold layer; and (3) molding: adding concrete into the mold layer to obtain a concrete leveling layer, and curing and curing to obtain the concrete leveling layer. The terrace obtained by the construction process disclosed by the invention realizes kerf-free bonding, is high in compressive strength, low in shrinkage rate and high in stability, and is not easy to have the problems of hollowing and cracking.

Description

Technical Field

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

[0002] With the rapid development of the national economy, underground garages, large industrial plants, logistics warehouses, etc. continue to emerge, and the use functions have increasingly stringent requirements on the flatness and construction quality of the ground. The existing national standard leveling layer usually refers to the national standard building atlas "12J304 Floor Building Structure", which generally uses a layer of cement slurry and then lays fine stone concrete for leveling. There are often problems such as insufficient compressive strength and easy hollowing and cracking of concrete, which are difficult to avoid.

[0003] Invention patent CN102691401B discloses a construction method for large-area concrete floor, and the construction steps are as follows: divide the construction flow section and the construction separation joint position, support the floor side template, install the force transmission rod at the junction of the flow section, set up the laser leveler, fix the leveling ruler, select the leveling base point, pour concrete in the space enclosed by the floor template, use the leveler to complete the vibration, compaction and leveling of the floor, complete the surface finishing and polishing of the concrete floor before the final setting of the concrete, maintain the concrete floor, cut the construction joint within 24 hours, and fill the construction separation joint for secondary maintenance. The 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 makes the later maintenance cost of the ground and the use of templates too large, and also solves the problems that the compartment joints on large-area concrete floors will be damaged along the joints, and the floor is easy to hollow and crack when poured in layers. 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 future, thereby causing the surface layer to crack.

[0004] In the existing technology, seamless floor construction technology came into being. Its structure is mainly realized by 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 complicated and costly, and is affected by the properties of the concrete itself, resulting in the shrinkage stability and compressive resistance of the seamless concrete floor. There is still room for improvement. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention discloses a construction process for seamless bonding of concrete floors. 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.

[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, and the construction process for a seamless bonded concrete floor comprises 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 reinforcing material and the auxiliary material on the pre-treated base surface in step (1) to obtain a mold layer;

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

[0011] In the step (2), the reinforcing material and the auxiliary material are fixed by using 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 preparation steps of the modified polypropylene fiber are as follows:

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

[0017] A2: In an inert atmosphere, vinyl triethoxysilane and 2-hydroxyethyl methacrylate are mixed and added toluene, the temperature is raised to 75-90°C, a catalyst is added, the reaction is carried out for 1-2 hours, and the modifier is obtained by filtering, washing and drying, and then mixed with anhydrous ethanol and stirred to obtain a 1-3wt% modified liquid;

[0018] A3: Immerse the pretreated polypropylene fiber in step A1 in the modified 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 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 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.

[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 expansion 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, and the water reduction rate is 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, fluorine-containing 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 reducing agent, an expansion agent and water, and mixing evenly.

[0035] On the one hand, the present invention discloses a novel concrete construction process, which realizes seamless bonding of 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, and effectively solves the problem of hollowing and plastic cracking easily occurring in large-area seamlessly bonded leveling concrete in the prior art.

[0036] The present invention firstly modifies the polypropylene fiber in the auxiliary material, introduces 2-hydroxyethyl methacrylate modified vinyl triethoxy silane 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 an effective bridging effect is played 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, in order to achieve a better shrinkage reduction effect, shrinkage reducers are often added to reduce the autogenous shrinkage and drying shrinkage of concrete by reducing the surface tension of the solution, but they often face the problem of large addition amount and may affect the compressive strength of concrete, and also need to consider its compatibility with other admixtures in the concrete system. The present invention improves the formula and proportion of concrete, adds a specially prepared expansion agent, effectively reduces the shrinkage rate of concrete, and further solves the problem of insufficient compressive strength of concrete floor after molding. The possible reason is that the water replenishment effect brought 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, which significantly improves the expansion rate of the expansive agent, and then synergistically plays a better role in compensating for autogenous shrinkage and drying shrinkage, improves the functionality of the expansive agent, and makes it still have 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 resistance 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 realizes 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 realizes 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, and effectively solves the problem of hollowing and plastic cracking easily occurring in large-area seamlessly 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 network structure of the polypropylene fiber molding, and on the other hand by improving its bonding strength when in contact with concrete, so that the comprehensive performance of the seamless bonded concrete floor is further improved.

[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 only used to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed 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 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 polycarboxylate 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 0.3g of β-cyclodextrin and 50mL of water, then add 8g of fluorinated gypsum powder, 10g of magnesium oxide clinker and 2g of aluminum carbonate in sequence, heat to 78°C, stir for 7.5h, dry and ball-mill to obtain an expansion agent.

[0051] Preparation Example 2

[0052] The specific preparation steps of the swelling agent are the same as those in Preparation Example 1, except that the added amount of β-cyclodextrin 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, 1100 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 of 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 of 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 fiber and 6wt% hydrogen peroxide solution were stirred at 95°C for 3h, and then washed and dried to obtain pretreated polypropylene fiber;

[0068] A2: Under nitrogen atmosphere, 5 g of vinyl triethoxysilane and 3.5 g of 2-hydroxyethyl methacrylate were mixed and added into 20 mL of toluene, the temperature was raised to 80°C, 0.004 g of benzoyl peroxide was added, the reaction was continued for 1.5 h, the modified agent was obtained after filtration, washing and drying, and then mixed with anhydrous ethanol and stirred to obtain a 2 wt% modified liquid;

[0069] A3: Immerse the pretreated polypropylene fiber in step A1 in the modified 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 comprises the following steps:

[0076] (1) Surface treatment: The surface of the reinforced concrete structural slab 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, to pre-treat the base surface;

[0077] (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 fix it to the pre-treated base surface in 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 the 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 it 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 comprises the following steps:

[0083] (1) Surface treatment: The surface of the reinforced concrete structural slab 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, to pre-treat the base surface;

[0084] (2) Fixing: Lay 8@150 single-layer bidirectional steel bars at a distance of 0.8 m 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 was heated at a rate of 1.5 kg / m 2 Add the concrete leveling layer on the formwork layer of step (2) at an interval of 400 mm and vibrate manually until the concrete surface stops sinking, let it stand for 28 days to solidify, then cure with water and cover it 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 comprises the following steps:

[0090] (1) Surface treatment: The surface of the reinforced concrete structural slab 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, to pre-treat the base surface;

[0091] (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 fix it to the pre-treated base surface in 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 was 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 550 mm and manually vibrate until the concrete surface stops sinking, let it stand for 28 days to solidify, then cure with water and cover it 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 Example 1, the difference is 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, the difference is 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, the difference is that the concrete used is obtained from Preparation Example 7.

[0101] Example 7

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

[0103] (1) Surface treatment: The surface of the reinforced concrete structural slab 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, to pre-treat the base surface;

[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 an interval of 480mm and vibrate it manually until the concrete surface stops sinking. Allow it to stand and solidify for 28 days, then cure it with water and cover it for 14 days to obtain the finished product.

[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 is obtained from Preparation Example 4.

[0107] Example 8

[0108] A construction process for seamlessly 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 9.

[0109] Example 9

[0110] A construction process for seamlessly 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 seamlessly 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 day and the 180th day according 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 100mm×100mm×100mm.

[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 for 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 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 will be affected; it can be seen from Example 5 that when the amount of aluminum carbonate added is changed when preparing the expansion agent, the compressive strength of the jointless bonded concrete floor will decrease; it can be seen from Example 6 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 will decrease, a large shrinkage will occur, and the problem of hollowing and cracking will occur; Example 7 is compared with Example 1. 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 hollowed and cracked due to shrinkage; compared with Example 1, Example 8 and Example 9 show that when the addition amounts of 2-hydroxyethyl methacrylate and modifier in step A2 are changed when preparing modified polypropylene fibers, 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 molding; 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 only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this 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 modification, equivalent change and modification 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 still fall within the scope of the technical solution of the present invention.

Claims

1. A construction process for seamless bonding concrete floor, characterized in that: The construction process of the seamless bonding 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 fixing: fixing the reinforcement material and the auxiliary material on the pre-treated base surface in step (1) to obtain a mold layer; (3) Forming: adding concrete to the mold layer of step (2) to obtain a concrete leveling layer, vibrating, curing and curing; In the step (2), the reinforcing material and the auxiliary material are fixed by using 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.

2. The construction process of the seamless bonding 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 bonding concrete floor according to claim 2 is characterized in that: 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.

4. The construction process of the seamless bonding concrete floor according to claim 3 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 .

5. The construction process of the seamless bonding concrete floor according to claim 1 is characterized in that: The preparation steps of the modified polypropylene fiber are as follows: A1: stirring polypropylene fiber and 4-10 wt% hydrogen peroxide solution at 90-100° C. for 2-4 hours, washing and drying to obtain pretreated polypropylene fiber; A2: In an inert atmosphere, vinyl triethoxysilane and 2-hydroxyethyl methacrylate are mixed and added toluene, the temperature is raised to 75-90°C, a catalyst is added, the reaction is carried out for 1-2 hours, and the modifier is obtained by filtering, washing and drying, and then mixed with anhydrous ethanol and stirred to obtain a 1-3wt% modified liquid; A3: Immerse the pretreated polypropylene fiber in step A1 in the modified solution in step A2, react for 3 to 5 hours, filter, wash and dry to obtain modified polypropylene fiber.

6. The construction process of the seamless bonding concrete floor according to claim 5 is characterized in that: The mass ratio of vinyl triethoxysilane to 2-hydroxyethyl methacrylate in step A2 is 1:(0.5-1).

7. The construction process of the seamless bonding 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.

8. The construction process of seamless bonding concrete floor according to claim 1 is characterized in that: 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 expansion agent and 100-120 parts of water.

9. The construction process of the seamless bonding concrete floor according to claim 8 is characterized in that: The preparation steps of the expansion agent are as follows: The beta-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.

10. The construction process of seamless bonding concrete floor according to claim 9 is characterized in that: The mass ratio of the beta-cyclodextrin, fluorinated gypsum powder, magnesium oxide clinker and hydrotalcite is (0.01-0.05):(0.7-0.9):1:(0.1-0.3).

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