Construction technology of polished floor with non-pyrophoric fine stone concrete

Abstract

The present invention provides a non-fired fine stone concrete polished floor construction process, wherein the coarse aggregate particle size in the surface fine stone concrete is 8mm to 12mm continuously graded, the fine aggregate is medium sand in zone II, the surface layer is poured before the base concrete completes initial setting, the base and the surface layer are continuously poured and constructed, and the surface layer concrete is polished after reaching a certain strength. The advantages of the present invention are: the installation process of the dividing strip is cancelled, and compared with the traditional non-fired terrazzo floor construction process, there is no need to wait for the base concrete to solidify and the dividing strip mortar to solidify to a certain strength before the subsequent construction is carried out, and no additional interface treatment is required for the base surface, which greatly reduces the construction time and shortens the construction period by about 45%; the surface layer is poured before the base concrete initially sets, and the surface layer adopts continuously graded concrete, and is evenly vibrated with a flat vibrator, which avoids the construction cold joints between the surface layer and the base layer and the shrinkage, hollowing and cracks of the surface layer, and improves the overall strength of the ground by about 15%.

Description

Technical Field

[0001] The invention belongs to the technical field of ground engineering, and in particular relates to a construction process for a non-pyrophoric fine stone concrete polished ground surface. Background Art

[0002] In the construction of national defense projects, due to the safety considerations of some special equipment and material storage, the building floor must have a certain degree of smoothness and non-flammable properties. Non-flammable terrazzo floor is a commonly used type.

[0003] The existing non-fired terrazzo floor is usually made by pouring a concrete base, laying a grid-shaped copper strip, and then laying cement gravel slurry, sprinkling a layer of non-fired gravel on the surface, and then grinding it with water after the surface layer solidifies.

[0004] According to the provisions of GB-50209-2021 "Construction Quality Acceptance Code for Building Ground Engineering", before laying the surface layer, the compressive strength of the cement base layer shall not be less than 1.2MPa, and the surface shall be rough, clean, moist and free of water accumulation before the surface layer construction can be carried out (for large-area cement surface layers, separation joints should be set). The overall compressive strength of the surface layer must reach 5MPa before it can be used normally. It is also required that the surface layer and the next layer should be firmly combined without hollows and cracks; when hollows occur, the hollow area should not be larger than 400cm 2 , and there should be no more than 2 places in each natural room or standard room.

[0005] Therefore, the construction process of traditional terrazzo floors is complicated, with a long cycle, low work efficiency and high pollution. In particular, due to the obvious structural interface between the terrazzo surface layer and the base layer, the upper and lower layers are not tightly combined, which makes it easy to delaminate, hollow and even crack, making quality control difficult.

[0006] The specific shortcomings are mainly manifested in: first, pasting the dividing strips is time-consuming, labor-intensive and material-intensive; second, the interval between the construction of the base concrete and the surface layer is long, the surface of the base layer is easily contaminated, and it is difficult to clean and rinse the surface of the base layer; third, there is an obvious structural interface between the base layer and the surface layer, the interface treatment is difficult, the base layer and the surface layer are not firmly bonded, and it is very easy to delaminate and hollow; fourth, the surface layer shrinks greatly after solidification, and the strength of the surface layer is low; fifth, the water grinding process is used for polishing the surface layer, and a large amount of sewage and waste slurry is generated during construction. The on-site working environment is poor and the drainage system is easily blocked. Summary of the invention

[0007] In view of the problems in the prior art that the construction procedures of non-pyrophoric terrazzo floors are complicated, the cycle is long, the work efficiency is low, and the pollution is high, especially the obvious structural interface between the terrazzo surface layer and the base layer leads to loose bonding between the upper and lower layers, easy delamination, hollowing and even cracks, and difficult quality control, the present invention provides a non-pyrophoric fine stone concrete polished floor construction process.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a non-pyrophoric fine stone concrete polished floor construction process, the surface layer concrete coarse aggregate particle size is 8mm ~ 12mm continuous grading, the fine aggregate is II zone medium sand, the surface layer is poured before the base concrete completes initial setting, the base and surface layers are poured and constructed continuously, and the surface layer concrete is polished after reaching the required strength.

[0009] Furthermore, the method specifically includes the following steps:

[0010] S1. Install embedded pipes; S2. Lay cushion layer; S3. Set elevation ash cakes and ribs; S4. Pour base concrete; S5. Lay non-pyrophoric fine stone concrete surface layer before initial setting of base layer; S6. Scrape the surface layer; S7. Level the slurry; S8. Sprinkle water for maintenance; S9. Test grinding and rough grinding for leveling; S10. Fine grinding and caulking and repairing with slurry; S11. Apply curing agent and cut the seams; S12. Sprinkle water for maintenance; S13. Fine grinding and polishing; S14. Caulk and beautify the seams.

[0011] Furthermore, in step S4, the pouring of the base concrete is divided into construction sections with a controlled length of 10-20 meters to ensure that the base concrete does not complete initial setting when the surface layer is poured.

[0012] Furthermore, the base concrete is poured to a ground elevation of -30mm according to the design requirements, compacted while pouring, and then smoothed, with the flatness error controlled within ±5mm.

[0013] Furthermore, the components and mass ratios of the surface concrete are water: cement: coarse aggregate: fine aggregate: water reducer = 180: 420: 1200: 550: 4.2; wherein the coarse aggregate is continuously graded dolomite with a particle size of 8 to 12 mm, the fine aggregate is medium-coarse dolomite sand with a particle size of 0.15 to 5 mm, the cement is 42.5 grade ordinary Portland cement, and the water reducer is a high-performance polycarboxylate water reducer.

[0014] Furthermore, in step S5, the surface layer concrete is constructed immediately 1.5 to 2 hours after the base layer concrete is poured.

[0015] Furthermore, step S9 is to conduct trial grinding 48 hours after the surface concrete is finally set. When the trial grinding is feasible, a dry grinder is used to perform rough grinding and leveling once with a 30-mesh diamond grinding head and a 50-mesh diamond grinding head respectively, and the grinding head speed is 900-1000 rpm; the grinding flatness error is less than 5 mm.

[0016] Furthermore, step S10 uses a dry grinder with a 100-mesh diamond grinding head for fine grinding to eliminate surface wear marks, with a rotation speed of 1000-1100 rpm, and a fine grinding flatness error of less than 3 mm. After polishing, the potholes are repaired with caulking agent, and then a 1:1 plain cement slurry is scraped on the entire surface to fill and moisturize.

[0017] Furthermore, in step S11, a curing agent is sprayed on the ground to cure the ground, and the curing agent is evenly applied and moisturized for more than 30 minutes; in step S12, watering and curing time is not less than 7 days.

[0018] In step S13, the fine grinding is performed by using resin grinding discs with fineness modulus of 50 mesh, 100 mesh, 200 mesh, 400 mesh, 800 mesh, and 1500 mesh, grinding one by one from low to high; then the ground protection agent is evenly sprayed, and after standing for 2 hours, it is cleaned and polished with a polishing pad.

[0019] The advantages of the present invention are: the dividing strip process is eliminated. Compared with the traditional terrazzo floor construction process, there is no need to wait for the base concrete to solidify and the dividing strip mortar to be cured and solidified to a certain strength before starting subsequent construction. There is no need to perform additional interface treatment on the base surface. The base and the surface layer can be continuously cast as a whole, which greatly reduces the construction time. The construction period of the same project volume is shortened by about 45%; the surface layer is cast before the base concrete initially sets, and the surface layer adopts continuous graded concrete and is evenly vibrated with a flat vibrator, which avoids construction cold joints between the surface layer and the base layer and shrinkage, hollowing and cracks of the surface layer. The surface layer and base layer form a whole, are not prone to shrinkage cracks, and the overall strength of the floor is improved by about 15%; the input of dividing copper strip materials and interface agents is reduced, the input of construction labor is greatly reduced, the construction cost is reduced, and the comprehensive construction benefits are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the traditional terrazzo floor craftsmanship effect;

[0021] Figure 2 It is a schematic diagram of the effect of polishing the floor surface of the non-pyrophoric fine stone concrete of the present invention.

[0022] 1—sand and gravel cushion layer, 2—concrete base layer, 3—non-pyrophoric fine stone concrete surface layer, 41—obvious construction joints, 42—no construction joints and tight connection DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in 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. 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] Compared with the problems of cold joints and shrinkage hollowing between the base layer and the surface layer in the construction process of traditional terrazzo floors, and difficulty in forming a whole, the present invention improves the construction process of non-pyrophoric terrazzo floors from two aspects. First, when pouring the base concrete, the surface layer is poured before the base concrete completes the initial setting, and the base and surface layers are poured continuously over a large area. Second, the formula of the non-pyrophoric concrete for the surface layer is prepared so that it can be more closely combined with the base layer while ensuring the strength of the surface layer. The combined effect of the two effectively controls the common problems of hollowing and cracks between the base and the surface layer (such as Figure 1 As shown), it improves the integrity and durability of the ground and ensures the strength of the overall ground.

[0025] The overall construction process is as follows:

[0026] Install embedded pipes → lay cushion layer → set elevation ash cakes and ribs → pour base concrete → lay non-pyrophoric fine stone concrete surface layer (before initial setting of base layer) → scrape the surface layer → level the slurry → sprinkle water for maintenance → test grinding and rough grinding for leveling → fine grinding and grouting and repairing → apply curing agent and cut the seams → sprinkle water for maintenance → fine grinding and polishing → grouting and beautifying the seams.

[0027] According to the national standard "General Portland Cement" GB175-2007: the initial setting time of ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, fly ash Portland cement and composite Portland cement shall not be earlier than 45 minutes, and the final setting time shall not be later than 10 hours (600 minutes). The initial setting period of commonly used base concrete is generally within 1.5 hours to 4 hours after pouring. For cements of different manufacturers and specifications or cements with early setting agents or retarders added, the initial setting period varies significantly. Therefore, in practice, after the base concrete is laid, wait until there is no obvious subsidence when the base is stepped on (to ensure a certain base strength for easy construction), and then start pouring the surface layer immediately.

[0028] At the same time, in order to ensure that the surface layer is poured before the initial setting of the base concrete, it is necessary to reasonably divide the construction sections so that the surface layer and the base can be poured and constructed continuously. When laying the surface layer, a vibrating scraper or manual vibration and leveling is used; the surface layer is made of non-fired dolomite and sand and other raw materials commonly used in the domestic market to prepare a continuously graded fine stone concrete. The coarse and fine aggregates are made of dolomite, marble and other rocks. The gradation is reasonable, clean and uniform without debris, and the mud content does not exceed 1% and 3% respectively. The particle size of the coarse aggregate is 8mm to 12mm, and the fine aggregate is medium sand in Zone II. The coarse and fine aggregates should be made of materials from the same origin and batch.

[0029] The following 100m 2 Take the floor construction of the room on the left and right as an example to explain the specific contents of each process. The specific steps are as follows:

[0030] S1. Install embedded parts; install embedded parts, tracks, turntables, cable trenches, inspection wells, floor drains and other reserved embedded facilities and equipment according to design requirements, check the embedded positions, and ensure that the elevation is accurate, the parts are firmly fixed and the protection is in place.

[0031] S2. Lay a gravel cushion layer. After cleaning the ground to the bedrock as required, lay spring permeable pipes or drainage blind pipes, lay a gravel cushion layer as required by the design, compact it with a small roller or electric rammer, and cover the surface with colored strips of cloth or plastic cloth as an isolation layer.

[0032] S3. Mark height ash cakes and install ribs; make height control ash cakes on site according to the designed elevation (the vertical spacing of ash cakes is about 1.5 meters, subject to the ribs not deflecting; the horizontal spacing is controlled within 4 meters, subject to the length of the scraper), and use steel bars to install and fix the rib bracket on the ash cake. The bottom elevation of the bracket is controlled to be -30mm. Φ30 steel pipes are installed and tied on the bracket as ribs, and the elevation error is controlled within ±5mm. The lower edge of the steel pipe ribs is used as the elevation control line of the base concrete, and the upper edge of the steel pipe is used as the surface concrete control line. Paste 800mm high plastic sheeting upward from the foot of the wall to protect the wall from pollution.

[0033] S4, pouring base concrete; using a mixing station to produce ordinary concrete (in this embodiment, C20 ordinary Portland cement is used) according to the design requirements, pouring to the ground -30mm elevation, and compacting with a flat vibrator while pouring to ensure the bearing strength of the base concrete; then use a scraper to initially level the concrete, and rub it with a wooden trowel, and check the flatness in time during the process, and the error is controlled within ±5mm. The length of the segmented pouring depends on the initial setting time of the base concrete, and the area is 100m 2 The pouring length of the room floor along the axis on the left and right sides should be controlled at about 10-20 meters each time. When the room span is small, the pouring length of each section can be appropriately increased, and channel steel can be used as the end stopper mold of each section. The operation can be cyclic. The general principle is to ensure that the base concrete has not completed initial setting when pouring the non-flammable surface layer.

[0034] S5. Pour the non-pyrophoric fine stone concrete surface layer. At 20℃, lay the surface layer 1.5-2h after the base concrete is poured and 3-4h before the pouring. During this time, the base has no obvious subsidence when stepped on and has a certain strength, but has not lost its plasticity. Use the non-pyrophoric fine stone concrete mixed on site to pour the surface layer in time. The pouring thickness is about 30mm. The top elevation of the steel pipe ribs is used as the benchmark. The top elevation of the surface layer should be about 5mm higher than the ribs (reserving the height consumed during polishing). When pouring, work from front to back. Try to reduce the number of people stepping on the surface layer as much as possible after pouring to ensure one-time forming.

[0035] S6. Scrape the surface layer flat. When pouring the surface concrete, workers wear special "wooden shoes" with increased contact surface (to minimize the depth of sinking when stepping on the concrete surface). Refer to the reinforcement elevation and use a scraper of about 4 meters to scrape the surface flat. A vibrating scraper can be used to assist in vibration and leveling. After scraping, remove the reinforcement and fill the reinforcement cavity marks. When scraping the surface layer flat, the traces of workers' work and the cavity after the reinforcement is pulled out should be filled with homogeneous fine stone concrete, and smoothed with a wooden trowel. Do not use the method of rolling around to fill, so as to avoid color difference or uneven distribution of stones.

[0036] S7. Slurry leveling: About 2 hours after the surface concrete is scraped flat (no obvious sinking when people step on it), refer to the practice of ordinary concrete floors and use an electric pallet trowel to perform slurry leveling. Smooth and fill the surface bubbles and small holes. Use a wooden trowel to manually smooth the edges and corners. The surface flatness error is controlled within 3 to 5 mm.

[0037] S8. Watering maintenance: About 8 to 12 hours after slurry leveling, the surface concrete is basically finally set and can be watered for moisturizing or covered with a film for maintenance.

[0038] S9, trial grinding, rough grinding and leveling; trial grinding should be carried out about 48 hours after the surface concrete is finally set. The principle of trial grinding is that no stones fall off and fly out. If the grinding time is too early, the stone particles are easy to loosen, and if it is too late, it will increase the difficulty of polishing; when trial grinding is feasible, use a dry grinder to install 30 and 50 mesh diamond grinding heads for rough grinding and leveling once, and the grinding head speed is 900-1000 rpm. During the grinding process, it is necessary to apply force evenly and avoid grinding in the same part for a long time to prevent grooves. When polishing, grind the floating slurry first, then grind the surface layer containing aggregates, and make the dry grinder go back and forth on the ground in an "S" shape to expand the grinding area; when rough grinding, grind until the aggregates are evenly exposed and the surface is basically flat. Take the 1m waistline as the standard, check the ground elevation at any time, and use a 4-meter scraper to check the ground flatness, so that the flatness error is less than 5mm. When rough grinding, it is advisable to sprinkle water on the ground to reduce dust.

[0039] S10, fine grinding and caulking and repairing with slurry; after rough grinding and leveling, use the laser line projector as a reference and a 100-mesh diamond grinding head for fine grinding to completely eliminate the surface wear marks. The speed should be 1000-1100 rpm. The corners are polished with Xingyi HTG-S250 multifunctional small grinder. The grinding height is the same as the surrounding ground. When fine grinding, use a 2-meter ruler to check the ground flatness at any time, and the accuracy should be controlled within 3mm. Clean the dust on the ground after polishing, check the ground and brush GM3000 caulking agent to repair individual missing stone particles or potholes, and then scrape a 1:1 plain cement slurry on the entire surface to fill and moisturize.

[0040] S11. Apply curing agent and cut seams. After about 3 hours of mortar repair, spray curing agent on the entire floor for curing. The curing agent should be evenly applied and kept moist for more than 30 minutes. Then use a handheld stone cutter to cut seams on the non-fireable concrete surface layer. The seam depth is about 5cm, the seam width is about 5mm, and the seam spacing is about 5 to 6 meters. For rooms with a span of more than 8m, longitudinal seams should be added along the axis. The seams should be horizontal and vertical, and attention should be paid to protecting the edges and corners on both sides of the seams.

[0041] S12. Watering maintenance: After the cutting is completed, the floor should be cleaned and immediately watered for maintenance for no less than 7 days. During this period, measures should be taken to strengthen the protection of the finished product.

[0042] S13, fine grinding and polishing with protective agent; after the surface maintenance is completed, use resin grinding discs with fineness modulus of 50 mesh (rotation speed of 900, second gear of walking speed), 100 mesh (rotation speed of 1000, second gear of walking speed), 200 mesh (rotation speed of 1100, third gear of walking speed), 400 mesh (rotation speed of 1200, fourth gear of walking speed), 800 mesh (rotation speed of 1300, sixth gear of walking speed), 1500 mesh (rotation speed of 1600, manual pushing fast trot) to grind one by one from low to high; then evenly spray the ground protective agent, let it stand for 2 hours, and then clean and polish it manually with a flat mop or electric polishing machine equipped with a polishing pad of 250mm in diameter until the ground is smooth, clean and shiny.

[0043] S14. Fill the seams and beautify the gaps; remove the dust in the partition seams, use bisphenol A epoxy resin to fill the seams, and fill the upper part of the seams about 10mm high with gold or silver floor tile caulking agent to increase the visual quality.

[0044] In this embodiment, after repeatedly adjusting the parameters such as water-cement ratio, sand ratio, and sand and gravel particle size, it is preferred to use 8-12mm continuously graded dolomite as coarse aggregate, 0.15-5mm medium coarse dolomite sand as fine aggregate, 42.5 grade ordinary Portland cement, and high-performance polycarboxylate water reducer as the mixed non-fireable floor surface material with a strength of C30, and the non-fireable performance has been tested and qualified. The coarse and fine aggregates of the surface layer should be sieved and cleaned before use, and the metal materials contained in them should be adsorbed by magnets.

[0045] The test determined that the mass ratio of the non-pyrophoric fine aggregate concrete surface layer with a strength of C30 is water: cement: dolomite: dolomite sand: water reducer = 180: 420: 1200: 550: 4.2; the parameter range of the continuous graded coarse aggregate with a particle size of 8-12mm and the fine aggregate with a particle size of 0.15-5mm in this formula increases the concrete bulk density and workability on the basis of taking into account the cost of the surface layer materials, is not prone to shrinkage and cracking, improves the surface appearance, and can be laid on the base before the initial setting to make the surface layer and the base layer more closely bonded (such as Figure 2 As shown), the overall strength of the ground is relatively high.

[0046] At the same time, the continuous construction process of the surface layer base layer adopted by the present invention can also effectively overcome the common problems of dusting, sanding, hollowing and cracking of the surface layer caused by the traditional non-fired cement floor base layer and the layered interval construction of the surface layer, and it also has important reference value for improving the construction quality of the non-fired cement floor.

[0047] Table 1 is a comparison table of the working hours per 100 square meters of the traditional terrazzo floor and the fine stone concrete polished floor of the present invention, and Table 2 is a comparison table of the comprehensive benefits of the construction process of the traditional terrazzo floor and the fine stone concrete polished floor.

[0048] Table 1 Comparison of working hours per 100 square meters for polishing traditional terrazzo and fine stone concrete floors

[0049]

[0050] Table 2 Comparison of comprehensive benefits of traditional terrazzo floor and fine stone concrete polished floor construction technology

[0051]

[0052]

[0053] As can be seen from the table, in the process of the present invention, since the base layer and the surface layer are continuously cast as a whole, the installation of the separation copper strips and the maintenance of the base layer mortar in the traditional ground construction can be eliminated, thereby greatly saving the entire construction time and construction cost. The construction period of the same amount of work is shortened by about 45%; every 100m 2 It can save about 200 meters of copper * 8 yuan / meter = 1,600 yuan, increase dolomite sand by 1.65 tons * 500 yuan / ton = 825 yuan, and save nearly 50% of the ground material cost. The labor consumption of non-pyrophoric fine stone concrete polished floor construction is reduced by about 24 working days per 100 square meters. According to the average cost of 300 yuan / working day, the labor cost is saved by nearly 7,200 yuan, with obvious economic benefits; the surface layer uses 8-12mm continuous graded concrete to make the surface layer and the base layer more closely connected, the surface layer and the base layer form a whole, and it is not easy to produce shrinkage cracks. The overall strength of the ground is increased by about 15%, which improves the comprehensive benefits.

[0054] Table 3 shows the strength and non-fire performance test results of the integral non-fireable fine stone concrete polished floor test specimens. The specifications of each specimen are 150*150*150mm.

[0055] Table 3 Test results of non-pyrophoric fine stone concrete polished floor

[0056]

[0057] The above is only the best specific implementation 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, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical content of the above suggestion into equivalent embodiments 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 according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of the solution of the present invention. The contents not described in detail in the specification of the present invention belong to the known technology of professional and technical personnel in this field.

Claims

1. A non-pyrophoric fine stone concrete polished floor construction process, characterized in that: The specific steps include: S1. Install embedded pipes; S2. Lay cushion layer; S3. Set elevation ash cakes and ribs; S4. Pour base concrete; S5. Lay non-pyrophoric fine stone concrete surface layer before the base is initially set; S6. Scrape the surface layer; S7. Level the slurry; S8. Sprinkle water for maintenance; S9. Test grinding and rough grinding for leveling; S10. Fine grinding and caulking and slurry repair; S11. Apply curing agent and cut the seams; S12. Sprinkle water for maintenance; S13. Fine grinding and polishing; S14 Caulking and beautifying the seams; The coarse aggregate of the non-pyrophoric fine stone concrete surface layer is dolomite with a particle size of 8 to 12 mm and continuous grading, the fine aggregate is medium-coarse dolomite sand with a particle size of 0.15 to 5 mm, the cement is 42.5 grade ordinary Portland cement, and the water reducer is a high-performance polycarboxylate water reducer. Step S5 is to carry out surface layer concrete construction 1.5 to 2 hours after the base concrete is poured, and the surface layer is laid within 3 to 4 hours. During this time, the base layer has no obvious subsidence when stepped on and has a certain strength, but has not lost plasticity; the base layer and the surface layer are poured and constructed continuously, and the surface layer concrete is polished after reaching the required strength.

2. The non-pyrophoric fine stone concrete polished floor construction process according to claim 1 is characterized by: In step S4, the base concrete pouring is divided into construction sections with a controlled length of 10-20 meters to ensure that the base concrete does not complete initial setting when the surface layer is poured.

3. The construction process for polished floor of non-pyrophoric fine stone concrete according to claim 1 is characterized in that: in step S4, the base concrete is poured to a ground elevation of -30 mm according to the design requirements, compacted while pouring, and then the concrete is rubbed flat, and the flatness error is controlled within ±5 mm.

4. The non-pyrophoric fine stone concrete polished floor construction process according to claim 1 is characterized in that: The components and mass ratio of surface concrete are water: cement: coarse aggregate: fine aggregate: water reducing agent = 180:420:1200:550:4.

2.

5. The non-pyrophoric fine stone concrete polished floor construction process according to claim 1 is characterized in that: Step S9: Test grinding is performed 48 hours after the surface concrete is finally set. When the test grinding is feasible, a dry grinder is used to perform rough grinding and leveling once with a 30-mesh diamond grinding head and a 50-mesh diamond grinding head respectively. The grinding head speed is 900-1000 rpm; the grinding flatness error is less than 5 mm.

6. The non-pyrophoric fine stone concrete polished floor construction process according to claim 5 is characterized by: Step S10 uses a dry grinder with a 100-mesh diamond grinding head to perform fine grinding to eliminate surface wear marks. The rotation speed is 1000-1100 rpm, and the fine grinding flatness error is less than 3mm. After polishing, the potholes are repaired with caulking agent, and then 1:1 plain cement slurry is scraped on the entire surface to fill and moisturize.

7. The non-pyrophoric fine stone concrete polished floor construction process according to claim 6 is characterized by: Step S11: spray curing agent to solidify the ground, apply the curing agent evenly and keep it moist for more than 30 minutes; Step S12: sprinkle water and maintain for no less than 7 days.

8. The non-pyrophoric fine stone concrete polished floor construction process according to claim 7 is characterized by: In step S13, the resin grinding discs with fineness modulus of 50 mesh, 100 mesh, 200 mesh, 400 mesh, 800 mesh and 1500 mesh are used for fine grinding from low to high one by one; then the ground protection agent is evenly sprayed, and after standing for 2 hours, it is cleaned and polished with a polishing pad.

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