A truck scale based on UHPC high-performance lightweight concrete material and a preparation method thereof

Abstract

The application relates to the technical field of concrete materials, in particular to a UHPC high-performance lightweight concrete material-based truck scale and a preparation method thereof. The load-bearing main body of the truck scale is made of UHPC high-performance lightweight concrete material with a specific formula, and the material is composed of the following raw materials: cement, silica fume, hollow glass microbeads, fly ash floating beads, shale ceramsite, steel fiber, water reducing agent, water, high molecular water absorbing resin and talcum powder. Through material formula innovation and preparation process optimization, the application can significantly reduce the material density while maintaining the UHPC ultra-high strength and high durability, improve the cushioning energy consumption capacity, flexibility and construction fluidity, reduce the transportation and installation cost and prolong the service life. The application has excellent frost resistance and impermeability and is suitable for multiple scenes such as logistics storage, mines, bridge toll stations and the like, and solves the technical problems of the traditional truck scale, such as excessive self-weight, insufficient durability, poor flexibility and limited impact resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete materials, and particularly relates to a UHPC high-performance lightweight concrete material-based truck scale and a preparation method thereof. BACKGROUND

[0002] As a large heavy-duty weighing equipment, the performance of the truck scale directly affects the weighing accuracy, use safety and operation cost. The bearing body of the traditional truck scale is mainly made of ordinary concrete or pure steel structure, but the following problems exist in actual application.

[0003] Excessive self-weight: the density of ordinary concrete is relatively high (2400-2500 kg / m³), which leads to a large overall weight of the concrete structure truck scale, increases the difficulty and cost of production, transportation and on-site installation, and puts strict requirements on the bearing capacity of the installation foundation; the self-weight of the steel structure truck scale is still relatively large, the amount of steel material is large, and the cost is high.

[0004] Insufficient durability: under complex working conditions such as high humidity, salt spray corrosion and freeze-thaw cycle, ordinary concrete is easy to crack and weather, and steel structure is easy to rust, which shortens the service life (usually about 15 years) and increases the maintenance cost; the existing lightweight concrete still has room for improvement in terms of frost resistance, impermeability and other durability indicators.

[0005] Mechanical performance limitation: traditional materials are difficult to simultaneously meet the requirements of high strength, lightweight and flexibility. The strength of ordinary concrete is low, and the increase in structural thickness aggravates the problem of excessive self-weight; the steel structure is easy to fatigue deformation under long-term heavy load, and lacks buffering and energy dissipation capacity, and cannot effectively absorb the impact load of vehicles; some lightweight concrete has the problems of insufficient flexibility and poor crack resistance, and is easy to crack due to temperature change or impact.

[0006] Construction and functional defects: the existing concrete material has great difficulty in flow degree regulation, which affects the construction efficiency; the truck scale as a device frequently subjected to vehicle impact lacks targeted buffering and energy dissipation design; in some scenarios, rapid construction and early strength improvement are required, but the traditional material has a long setting time, which is difficult to meet the requirements.

[0007] Ultra-high performance concrete (UHPC) has excellent properties such as ultra-high strength, high durability and high toughness, but the existing UHPC density is still high (2400-2500 kg / m³), and the lightweight property is insufficient, and there is still room for optimization in terms of flexibility, cushioning energy consumption, construction fluidity and the like. As a new type of pore former, high molecular water absorbing resin can significantly improve the brittleness and energy dissipation capacity of the material, which is suitable for cushioning scenarios; the system of mixing talc and fly ash can effectively improve the flexibility and fluidity of the material; sulphoaluminate cement can shorten the setting time and improve the early strength; the lightweight and high durability design concept of foamed lightweight concrete provides a reference for the performance optimization of UHPC. Therefore, by integrating the advantages of the above material technologies, optimizing the UHPC formula and preparation process, and developing a truck scale with lightweight, high strength, high durability, good flexibility and cushioning energy consumption capacity, the technical problem to be solved in the field is solved.

[0008] Therefore, according to the related technology in the above, it is urgent to develop a truck scale based on UHPC high-performance lightweight concrete material and a preparation method thereof. SUMMARY

[0009] Therefore, the purpose of the present application is to provide a truck scale based on UHPC high-performance lightweight concrete material and a preparation method thereof, which realizes lightweight design of the truck scale through material formula innovation and process optimization, while ensuring that it has ultra-high strength, high durability, good flexibility and cushioning energy consumption capacity, reduces transportation and installation cost, shortens construction period, prolongs service life, and meets the needs of multi-scenario heavy load weighing.

[0010] Based on the above purpose, the present application provides a truck scale based on UHPC high-performance lightweight concrete material and a preparation method thereof.

[0011] A truck scale based on UHPC high-performance lightweight concrete material, the load-bearing main body of the truck scale is made of UHPC high-performance lightweight concrete material, and the concrete material comprises the following mass parts of raw materials: cement 15-25 parts, silica fume 5-10 parts, hollow glass microbeads 2-4 parts, fly ash floating beads 5-10 parts, shale ceramsite 30-40 parts, steel fiber 1-3 parts, water reducing agent 1-2 parts, water 6-10 parts and synergistic additive 7-13 parts.

[0012] The synergistic additive comprises high molecular water absorbing resin and talc, and the mass ratio of the high molecular water absorbing resin and the talc is 2-5:5-8.

[0013] Preferably, the cement is ordinary portland cement with a strength of ≥52.5 MPa.

[0014] Preferably, the specific surface area of the silica fume is ≥15000 m 2 / kg, and the SiO2 content is >92%.

[0015] Preferably, the particle size of the high molecular water-absorbing resin is 10-20 mesh, and the apparent density is 350-450 kg / m 3 .

[0016] Preferably, the particle size of the talc powder is 425 mesh, the water content is ≤0.5%, and the loss on ignition is ≤45%.

[0017] Preferably, the apparent density of the hollow glass microsphere is 350-450 kg / m 3 , and the particle size is 150-200 μm.

[0018] Preferably, the particle size of the fly ash floating bead is 20-40 mesh, and the apparent density is 500-520 kg / m 3 .

[0019] Preferably, the apparent density of the shale ceramsite is 1300-1400 kg / m³; the length of the steel fiber is 10-20 mm, and the diameter is 0.2-0.5 mm; the water reducing agent is a polycarboxylic acid type water reducing agent powder, and the water reducing rate is 35%-40%.

[0020] Preferably, the auxiliary repair material of the truck scale adopts a sulphoaluminate cement composite mortar, wherein the content of sulphoaluminate cement in the composite mortar is 10%-15%.

[0021] A preparation method of a truck scale based on UHPC high-performance lightweight concrete material, comprising the following steps:

[0022] Step S1. Raw material pretreatment: after the high molecular water-absorbing resin is completely soaked in water, it is initially dried at 50°C for 48 h, and then soaked in a sodium carbonate solution for 18 h for standby, to ensure uniformity of pore formation, and obtain the pretreated high molecular water-absorbing resin; the talc powder and fly ash floating bead are uniformly pre-mixed to form a composite filler to improve the mixing uniformity;

[0023] Step S2. Dry material mixing: weigh the cement, silica fume, hollow glass microsphere, pretreated composite filler, shale ceramsite and steel fiber, add them into a mixer, dry mix for 3-5 min to ensure uniform mixing of the raw materials and avoid local clumping, and then add the high molecular water-absorbing resin and dry mix together;

[0024] Step S3. Pre-mixing: add 70%-85% of the total water into the mixer and continue to stir for 5-8 min to fully wet the dry materials and form a uniform pre-mix;

[0025] Step S4. Rheological adjustment: add the remaining water and all water reducing agents into the pre-mix and stir for 3-5 min to adjust the rheological properties of the concrete slurry, so that the fluidity reaches 150-170 mm to meet the pumping or pouring requirements.

[0026] Step S5. Forming: Pour the adjusted concrete slurry into a preset mold, and use high-pressure forming or vibration forming process to remove internal bubbles. If the pouring height exceeds 3m, use layered pouring method, with each layer pouring thickness controlled within 0.3-0.8m, and the interval between adjacent layers not exceeding 2h to ensure compactness. The pressure during high-pressure forming is 10-30MPa;

[0027] Step S6. Curing: Move the formed concrete member into a curing room, and use any one of steam curing, high-temperature and high-pressure curing, and normal temperature curing to accelerate the hydration reaction and improve the strength. The conditions for steam curing are 70℃ curing for 5 days, the conditions for high-temperature and high-pressure curing are 250-400℃, 5-20MPa environment curing, and the curing time for normal temperature curing is not less than 7 days;

[0028] Step S7. Demolding and processing: After curing is completed, remove the mold, and cut, polish and process the load-bearing body according to the design requirements of the truck scale. When there is a joint or repair requirement, use a composite mortar with a sulphoaluminate cement content of 10%-15% for processing;

[0029] Step S8. Quality detection: Perform quality detection on the finished product, and obtain a truck scale based on UHPC high-performance lightweight concrete material after all indicators meet the standards.

[0030] The cement is ordinary portland cement with a strength ≥52.5MPa, which provides the basic strength of the material;

[0031] The specific surface area of silica fume is ≥15000m 2 / kg, the SiO2 content is >92%, the particle size distribution is optimized, and the compactness is improved;

[0032] The apparent density of hollow glass microbeads is 350-450kg / m 3 , and the particle size is 150-200μm; the particle size of fly ash floating beads is 20-40 mesh, and the apparent density is 500-520kg / m 3 ; the apparent density of shale ceramsite is 1300-1400kg / m 3 , which cooperatively reduces the material density;

[0033] The particle size of the high-molecular water-absorbing resin in the synergistic additive is 10-20 mesh, and the volume fraction is 30%-40%. After foaming, air drying, and sodium carbonate solution soaking pretreatment, it is used as a pore former to improve the material's buffering energy consumption ability and brittleness;

[0034] The particle size of talc is 425 mesh, and it is compounded with fly ash floating beads to improve the material's flexibility and fluidity;

[0035] The steel fiber has a length of 10-20mm and a diameter of 0.2-0.5mm, and can enhance the toughness and crack resistance of the material;

[0036] The water reducing agent is a polycarboxylic acid type water reducing agent powder, and the water reducing rate is 35%-40%, which can reduce the water binder ratio, improve the fluidity and compactness;

[0037] The auxiliary repair material is a composite mortar with a sulphoaluminate cement content of 10%-15%, a setting time of less than or equal to 1.5h, and a 3d compressive strength of greater than or equal to 20MPa, and is used for joint treatment and local repair.

[0038] The beneficial effects of the present application are:

[0039] The present application provides a UHPC high-performance lightweight concrete material-based truck scale and a preparation method thereof.

[0040] The present application retains the ultrahigh strength characteristics (compressive strength greater than or equal to 200MPa) of UHPC, meets the large-span and high-load requirements (load capacity up to 80-90t), and the recombination of talcum powder and fly ash floating beads reduces the material compression ratio to less than or equal to 1.91, significantly increases the lateral deformation, improves the flexibility, and effectively reduces the cracks caused by temperature changes and impacts.

[0041] The present application integrates the durability design concept of foamed lightweight concrete, and the product has an anti-freezing grade of greater than or equal to F150, an impermeability grade of greater than or equal to S8, and a carbonation depth of less than 10mm, and is not easy to crack and corrode in harsh environments such as salt spray and freeze-thaw cycles, prolongs the service life, and reduces the maintenance cost.

[0042] The present application optimizes the material flow degree to 150-170mm, which is easy to pump and pour; the layered pouring process is suitable for complex structure construction; the sulphoaluminate cement composite mortar auxiliary repair material has a setting time of less than or equal to 1.5h and a 3d compressive strength of greater than or equal to 20MPa, which meets the rapid construction and early strength requirements and shortens the overall construction period.

[0043] The product provided by the present application has the advantages of lightweight, high strength, high durability and buffering performance, and is not only suitable for traditional logistics and mine scenes, but also can be applied to special scenes such as bridge toll stations and port terminals, and is especially suitable for soft soil foundation areas, which reduces the requirement for foundation bearing capacity. DETAILED DESCRIPTION

[0044] For the purposes of the present invention, the technical solutions and advantages are more clearly and obviously understood, the present invention is further described in detail below in combination with specific embodiments.

[0045] Embodiment 1: A preparation method of a truck scale based on a UHPC high-performance lightweight concrete material, comprising the following steps:

[0046] S1. Raw material pretreatment: Put the high molecular water absorbing resin with a particle size of 10-20 mesh and an apparent density of 350-450 kg / m 3 into clean water to completely soak, then dry at 50 DEG C for 48 h, and then soak in a sodium carbonate solution for 18 h for standby, to ensure uniformity of pore formation, to obtain pretreated high molecular water absorbing resin; uniformly premix 5 parts of talc powder with a particle size of 425 mesh, a water content of ≤0.5% and a loss on ignition of ≤45% with 5 parts of fly ash floating beads with a particle size of 20-40 mesh and an apparent density of 500-520 kg / m 3 , to improve mixing uniformity;

[0047] S2. Dry material mixing: weigh 15 parts of ordinary Portland cement with a strength of ≥52.5 MPa, 5 parts of silica fume with a specific surface area of ≥15000 m 2 / kg and a SiO2 content of >92%, 2 parts of hollow glass microspheres with an apparent density of 350-450 kg / m 3 and a particle size of 150-200 μm, 10 parts of pretreated composite filler, 30 parts of shale ceramsite with an apparent density of 1300-1400 kg / m 3 , and 1 part of steel fiber with a length of 10-20 mm and a diameter of 0.2-0.5 mm, add them into a mixer, dry mix for 3 min, to ensure uniform mixing of the raw materials and avoid local clumping, then add 2 parts of high molecular water absorbing resin, dry mix together, wherein the cement is ordinary Portland cement with a strength of ≥52.5 MPa, to provide basic strength for the material; the specific surface area of the silica fume is ≥15000 m 2 / kg, and the SiO2 content is >92%, to optimize the particle size distribution and improve the density; the apparent density of the hollow glass microspheres is 350-450 kg / m 3 , and the particle size is 150-200 μm; the particle size of the fly ash floating beads is 20-40 mesh, and the apparent density is 500-520 kg / m 3 ; the apparent density of the shale ceramsite is 1300-1400 kg / m 3The material density can be synergistically reduced; the particle size of the high-molecular water-absorbing resin in the synergistic additive is 10-20 meshes, and the volume fraction is 30%-40%, which is pretreated by foaming, air drying and sodium carbonate solution immersion, and used as a pore former to improve the material's buffering energy consumption capacity and brittleness; the particle size of the talc powder is 425 meshes, which is mixed with fly ash and floating beads to improve the material's flexibility and fluidity; the length of the steel fiber is 10-20 mm, and the diameter is 0.2-0.5 mm, which can enhance the material's toughness and crack resistance;

[0048] S3. Pre-mixing: add 70% of the total water to the mixer and continue stirring for 5 min to fully wet the dry materials and form a uniform pre-mix;

[0049] S4. Rheological adjustment: add the remaining water and 1 part of polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40% to the pre-mix, stir for 3 min, and adjust the rheological properties of the concrete slurry to achieve a fluidity of 150-170 mm to meet the pumping or pouring requirements. The superplasticizer is a polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40%, which can reduce the water-binder ratio, improve the fluidity and density;

[0050] S5. Forming: pour the adjusted concrete slurry into a pre-set mold, and use high-pressure forming or vibration forming process to remove internal bubbles. If the pouring height exceeds 3 m, use a layered pouring method, with each layer's pouring thickness controlled at 0.3-0.8 m, and the interval between adjacent layers not exceeding 2 h to ensure compactness. The pressure during high-pressure forming is 10-30 MPa;

[0051] S6. Curing: move the formed concrete components into a curing room, use steam curing to accelerate the hydration reaction and improve the strength. The steam curing conditions are 70℃ for 5 days;

[0052] S7. Demolding and processing: after curing, remove the mold and cut, polish and process the load-bearing body according to the design requirements of the truck scale. If there is a joint or repair requirement, use a composite mortar with a sulphoaluminate cement content of 10% for treatment. The setting time of the auxiliary repair material is ≤1.5 h, and the 3d compressive strength is ≥20 MPa, which is used for joint treatment and local repair;

[0053] S8. Quality detection: perform quality detection on the finished product, and obtain a truck scale based on UHPC high-performance lightweight concrete material after all indicators meet the standards.

[0054] Embodiment 2: A preparation method of a truck scale based on UHPC high-performance lightweight concrete material, comprising the following steps:

[0055] S1. Raw material pretreatment: pretreat the raw materials with a particle size of 10-20 meshes and an apparent density of 350-450 kg / m 3The polymer water-absorbing resin is put into clean water and completely soaked, then is initially dried at 50℃ for 48h, and then is soaked in a sodium carbonate solution for 18h for pretreatment, to ensure uniform pore formation, and a pretreated polymer water-absorbing resin is obtained; 6 parts of talc powder with a particle size of 425 mesh, a water content of ≤0.5% and a loss on ignition of ≤45% are uniformly premixed with 7 parts of fly ash floating beads with a particle size of 20-40 mesh and an apparent density of 500-520kg / m 3 The fly ash floating beads are uniformly premixed to improve the uniformity of mixing;

[0056] S2. Dry material mixing: 18 parts of ordinary Portland cement with a strength of ≥52.5MPa, 7 parts of silica fume with a specific surface area of ≥15000m 2 / kg and a SiO2 content of >92%, 3 parts of hollow glass microspheres with an apparent density of 350-450kg / m 3 and a particle size of 150-200μm, 10-13-16-18 parts of pretreated composite filler, 33 parts of shale ceramsite with an apparent density of 1300-1400kg / m 3 and 2 parts of steel fiber with a length of 10-20mm and a diameter of 0.2-0.5mm are added to a mixer and dry mixed for 4min to ensure uniform mixing of the raw materials and avoid local clumping, and then 3 parts of polymer water-absorbing resin are added and dry mixed together, wherein the cement is ordinary Portland cement with a strength of ≥52.5MPa, which provides the basis for the strength of the material; the silica fume has a specific surface area of ≥15000m 2 / kg and a SiO2 content of >92%, which can optimize the particle size distribution and improve the density; the hollow glass microspheres have an apparent density of 350-450kg / m 3 and a particle size of 150-200μm; the fly ash floating beads have a particle size of 20-40 mesh and an apparent density of 500-520kg / m 3 ; the shale ceramsite has an apparent density of 1300-1400kg / m 3 , which can synergistically reduce the density of the material; the synergistic agent, the polymer water-absorbing resin, has a particle size of 10-20 mesh and a volume fraction of 30%-40%, which is pretreated by soaking, drying and soaking in a sodium carbonate solution, and serves as a pore-forming agent to improve the energy consumption and brittleness of the material; the talc powder has a particle size of 425 mesh and is compounded with fly ash floating beads, which can improve the flexibility and flowability of the material; the steel fiber has a length of 10-20mm and a diameter of 0.2-0.5mm, which can enhance the toughness and crack resistance of the material;

[0057] S3. Pre-mixing: 75% of the total water is added to the mixer and continues to stir for 6min to fully wet the dry materials and form a uniform pre-mix;

[0058] S4. Rheology adjustment: add the remaining water and 1.3 parts of polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40% to the premix, stir for 4 min, and adjust the rheological properties of the concrete slurry to achieve a flow degree of 150-170 mm to meet the pumping or pouring requirements. The superplasticizer is polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40%, which can reduce the water-binder ratio and improve the fluidity and compactness;

[0059] S5. Forming: pour the adjusted concrete slurry into a pre-set mold, and use high-pressure forming or vibration forming process to remove internal air bubbles. If the pouring height exceeds 3 m, use layered pouring method, with each layer pouring thickness controlled within 0.3-0.8 m, and the interval between adjacent layers not exceeding 2 h to ensure compactness. The pressure during high-pressure forming is 10-30 MPa.

[0060] S6. Curing: move the formed concrete component into a curing room, and use high-temperature and high-pressure curing to accelerate the hydration reaction and improve the strength. The high-temperature and high-pressure curing conditions are 250-400℃ and 5-20 MPa environment curing.

[0061] S7. Demolding and processing: after curing is completed, remove the mold, and cut, polish and process the load-bearing body according to the design requirements of the truck scale. When there is a joint or repair requirement, use a composite mortar with a sulphoaluminate cement content of 12% for processing, wherein the setting time of the auxiliary repair material is ≤1.5h, and the 3d compressive strength is ≥20MPa, which is used for joint treatment and local repair.

[0062] S8. Quality detection: perform quality detection on the finished product, and obtain a truck scale based on UHPC high-performance lightweight concrete material after all indicators meet the standards.

[0063] Embodiment 3: A preparation method of a truck scale based on UHPC high-performance lightweight concrete material, comprising the following steps:

[0064] S1. Raw material pretreatment: put the high-molecular water-absorbing resin with a particle size of 10-20 mesh and an apparent density of 350-450 kg / m 3 into clean water to completely soak, then dry at 50℃ for 48h, and then soak in a sodium carbonate solution for 18h for standby, to ensure uniform pore formation, and obtain pretreated high-molecular water-absorbing resin; uniformly premix 7 parts of talc powder with a particle size of 425 mesh, water content ≤0.5% and loss on ignition ≤45% with 9 parts of fly ash floating beads with a particle size of 20-40 mesh and an apparent density of 500-520 kg / m 3 to improve mixing uniformity;

[0065] S2. Dry material mixing: weigh 21 parts of ordinary Portland cement with a strength of ≥52.5MPa, 9 parts of silica fume with a specific surface area of ≥15000m2 / kg and SiO2 content >92% of silica fume, 3.5 parts of hollow glass microspheres with an apparent density of 350-450 kg / m 3 and a particle size of 150-200 μm, 16 parts of pre-processed composite fillers, 36 parts of shale ceramsite with an apparent density of 1300-1400 kg / m 3 and 2.5 parts of steel fibers with a length of 10-20 mm and a diameter of 0.2-0.5 mm are added to the mixer, dry mixing for 5 min to ensure uniform mixing of the raw materials and avoid local clumping. Then 4 parts of high molecular water-absorbing resin are added and dry mixed together. The cement is ordinary portland cement with a strength ≥ 52.5 MPa, providing the basic strength of the material. The specific surface area of the silica fume is ≥ 15000 m 2 / kg, and the SiO2 content is >92%, which can optimize the particle size distribution and improve the density. The apparent density of the hollow glass microspheres is 350-450 kg / m 3 , and the particle size is 150-200 μm. The particle size of the fly ash floating beads is 20-40 mesh, and the apparent density is 500-520 kg / m 3 . The apparent density of the shale ceramsite is 1300-1400 kg / m 3 , which can synergistically reduce the density of the material. The particle size of the high molecular water-absorbing resin in the synergistic additive is 10-20 mesh, and the volume fraction is 30%-40%. After foaming, air drying, and soaking in sodium carbonate solution for pretreatment, it serves as a pore-forming agent to improve the energy consumption and brittleness of the material. The particle size of the talc is 425 mesh, and it can improve the flexibility and flowability of the material when combined with fly ash floating beads. The length of the steel fibers is 10-20 mm, and the diameter is 0.2-0.5 mm, which can enhance the toughness and crack resistance of the material.

[0066] S3. Pre-mixing: Add 80% of the total water to the mixer and continue stirring for 5-6-7-8 min to fully wet the dry materials and form a uniform pre-mix.

[0067] S4. Rheological adjustment: Add the remaining water and 1.6 parts of polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40% to the pre-mix and stir for 4 min to adjust the rheological properties of the concrete slurry, making the flowability reach 150-170 mm to meet the pumping or pouring requirements. The superplasticizer is polycarboxylate superplasticizer powder with a water-reducing rate of 35%-40%, which can reduce the water-binder ratio, improve the flowability, and increase the density.

[0068] S5. Forming: Pour the adjusted concrete slurry into the pre-set mold and use high-pressure forming or vibration forming process to remove internal air bubbles. If the pouring height exceeds 3 m, use a layered pouring method, with each layer's pouring thickness controlled at 0.3-0.8 m, and the interval between adjacent layers not exceeding 2 h to ensure the density. The pressure during high-pressure forming is 10-30 MPa.

[0069] S6. Curing: After the concrete component is formed, it is moved into a curing room for curing at room temperature to accelerate the hydration reaction and improve the strength, wherein the curing time of the curing at room temperature is not less than 7 days;

[0070] S7. Demolding and processing: After the curing is completed, the mold is removed, and the load-bearing main body is cut, polished and processed according to the design requirements of the truck scale; when there is a joint or repair requirement, a composite mortar with a sulphoaluminate cement content of 14% is used for processing, wherein the setting time of the composite mortar in the auxiliary repair material is ≤1.5h, and the 3d compressive strength is ≥20MPa, which is used for joint treatment and local repair;

[0071] S8. Quality detection: The finished product is subjected to quality detection, and the truck scale based on the UHPC high-performance lightweight concrete material is obtained after the indicators meet the standards.

[0072] Embodiment 4: A preparation method of a truck scale based on a UHPC high-performance lightweight concrete material, comprising the following steps:

[0073] S1. Raw material pretreatment: A high-molecular water-absorbing resin with a particle size of 10-20 mesh and an apparent density of 350-450kg / m 3 is completely soaked in water, then it is initially dried at 50℃ for 48h, and then it is soaked in a sodium carbonate solution for 18h for standby, so as to ensure the uniformity of pore formation, thereby obtaining the pretreated high-molecular water-absorbing resin; 8 parts of talc powder with a particle size of 425 mesh, a water content of ≤0.5% and a loss on ignition of ≤45% are uniformly premixed with 10 parts of fly ash floating beads with a particle size of 20-40 mesh and an apparent density of 500-520kg / m 3 to improve the mixing uniformity, thereby preparing a composite filler;

[0074] S2. Dry material mixing: 25 parts of ordinary Portland cement with a strength of ≥52.5MPa, 10 parts of silica fume with a specific surface area of ≥15000m 2 / kg and a SiO2 content of >92%, 4 parts of hollow glass microspheres with an apparent density of 350-450kg / m 3 and a particle size of 150-200μm, 18 parts of the pretreated composite filler, 40 parts of shale ceramsite with an apparent density of 1300-1400kg / m 3 and 3 parts of steel fiber with a length of 10-20mm and a diameter of 0.2-0.5mm are added into a stirrer, and dry mixing is performed for 5min to ensure that the raw materials are uniformly mixed and local caking is avoided; then 5 parts of high-molecular water-absorbing resin are added, and dry mixing is performed, wherein the cement is ordinary Portland cement with a strength of ≥52.5MPa, which provides the basis strength of the material; the specific surface area of the silica fume is ≥15000m 2 / kg, SiO2 content > 92%, can optimize particle size distribution, improve density; hollow glass microspheres have an apparent density of 350-450 kg / m 3 , particle size of 150-200 pm; fly ash floating beads have a particle size of 20-40 mesh and an apparent density of 500-520 kg / m 3 ; shale ceramsite has an apparent density of 1300-1400 kg / m 3 , which can synergistically reduce material density; the particle size of the synergistic additive high molecular water absorbing resin is 10-20 mesh, and the volume fraction is 30%-40%, which is pretreated by foaming, air drying and sodium carbonate solution soaking as a pore former to improve the material's buffering energy consumption capacity and brittleness; the particle size of talc is 425 mesh, which can be mixed with fly ash floating beads to improve the material's flexibility and fluidity; the length of steel fiber is 10-20 mm, and the diameter is 0.2-0.5 mm, which can enhance the material's toughness and crack resistance;

[0075] S3. Pre-mixing: add 85% of the total water to the mixer and continue stirring for 8 min to make the dry materials fully wet and form a uniform pre-mix;

[0076] S4. Rheological adjustment: add the remaining water and 2 parts of polycarboxylic acid type water reducing agent powder with a water reducing rate of 35%-40% to the pre-mix, stir for 5 min, adjust the rheological properties of the concrete slurry, and make the fluidity reach 150-170 mm to meet the pumping or pouring requirements. The water reducing agent is polycarboxylic acid type water reducing agent powder with a water reducing rate of 35%-40%, which can reduce the water-binder ratio, improve the fluidity and density;

[0077] S5. Forming: pour the adjusted concrete slurry into the pre-set mold, and use high-pressure forming or vibration forming process to remove internal bubbles. If the pouring height exceeds 3 m, use layered pouring method, with each layer pouring thickness controlled at 0.3-0.8 m, and adjacent layer pouring interval not exceeding 2 h to ensure the compactness. The pressure during high-pressure forming is 10-30 MPa;

[0078] S6. Curing: move the formed concrete components into the curing room and use steam curing to accelerate the hydration reaction and improve the strength. The steam curing conditions are 70°C for 5 days;

[0079] S7. Demolding and processing: after curing, remove the mold and cut, polish and process the load-bearing body according to the design requirements of the truck scale. If there is a joint or repair requirement, use a composite mortar with a sulfoaluminate cement content of 15% for treatment. The setting time of the auxiliary repair material composite mortar is ≤1.5 h, and the 3d compressive strength is ≥20 MPa, which is used for joint treatment and local repair;

[0080] S8. Quality detection: the quality of the finished product is detected, and the automobile scale based on the UHPC high-performance lightweight concrete material is obtained after the indicators meet the standards.

[0081] Comparative Example 1:

[0082] The comparative example is compared with Example 1, and no synergistic additive is added in the preparation process of the automobile scale based on the UHPC high-performance lightweight concrete material, i.e., no high molecular water-absorbing resin and talc powder is added, and the remaining steps and parameters are the same. The comparative example will not be repeated, and the final automobile scale based on the UHPC high-performance lightweight concrete material is obtained.

[0083] Comparative Example 2:

[0084] The comparative example is compared with Example 1, and no talc powder is added in the preparation process of the automobile scale based on the UHPC high-performance lightweight concrete material, and the remaining steps and parameters are the same. The comparative example will not be repeated, and the final automobile scale based on the UHPC high-performance lightweight concrete material is obtained.

[0085] Comparative Example 3:

[0086] The comparative example is compared with Example 1, and no high molecular water-absorbing resin is added in the preparation process of the automobile scale based on the UHPC high-performance lightweight concrete material, and the remaining steps and parameters are the same. The comparative example will not be repeated, and the final automobile scale based on the UHPC high-performance lightweight concrete material is obtained.

[0087] Comparative Example 4:

[0088] The comparative example is compared with Example 1, and the high molecular water-absorbing resin is not pretreated, i.e., it is directly dry-mixed without being subjected to swelling, air-drying and sodium carbonate soaking treatment. The remaining steps and parameters are the same. The comparative example will not be repeated, and the final automobile scale based on the UHPC high-performance lightweight concrete material is obtained.

[0089] Comparative Example 5:

[0090] The comparative example is compared with Example 1, and the talc powder and fly ash floating beads are not compounded, but are added separately in the preparation process. The remaining steps and parameters are the same. The comparative example will not be repeated, and the final automobile scale based on the UHPC high-performance lightweight concrete material is obtained.

[0091] Comparative Example 6:

[0092] The comparative example is compared with Example 1, and the ordinary Portland cement mortar is used instead of the 15% composite mortar of the sulphoaluminate cement. The remaining steps and parameters are the same. The comparative example will not be repeated, and the final 15% composite mortar of the sulphoaluminate cement is obtained.

[0093] Performance test:

[0094] The products prepared in Examples 1-4 and Comparative Examples 1-6 were subjected to the following performance tests:

[0095] 1. Dry density: concrete paste was prepared according to the formulation of the example / comparative example, poured into a 100 mm x 100 mm x 100 mm cubic mold, and after high pressure / vibration molding, it was cured according to the corresponding curing system (steam curing 70°C / 5 days, high temperature and high pressure curing 250-400°C / 5-20MPa, normal temperature curing ≥7 days) to 28d, after demolding, the surface defect test pieces were removed, and 3 groups of complete test pieces were selected for standby.

[0096] Test equipment: electronic balance (accuracy 0.1g), vernier caliper (accuracy 0.02mm), oven (temperature control range 50-200°C);

[0097] Test process: measure the length, width and height of each group of test pieces with a vernier caliper, measure each dimension 3 times, and calculate the average value to calculate the volume V of the test piece (unit: m 3 ); weigh the wet mass m1 of the test piece after curing (unit: kg) with an electronic balance; dry the test piece in a 105°C oven to a constant weight (the difference between the two mass measurements is ≤0.5%), and weigh the dry mass m2 (unit: kg) after cooling to room temperature; calculate the dry density according to the formula ρ=m2 / V, and take the average value of the 3 groups of test pieces as the test result.

[0098] 2. 28d compressive strength test: test piece preparation: same as the test piece preparation process of dry density test, select 3 groups of 100mm x 100mm x 100mm cubic test pieces, and cure for 28d for standby.

[0099] Test equipment: microcomputer control electro-hydraulic servo universal testing machine (range ≥3000kN, loading accuracy ±1%), test piece surface grinding machine;

[0100] Test process: use the grinding machine to grind the upper and lower pressure surfaces of the test piece to ensure that the surface flatness error is ≤0.05mm; place the test piece in the center of the test machine pressure plate, adjust the pressure plate to fully contact the test piece to avoid local stress; load at a uniform loading speed of 0.5MPa / s until the test piece fails (the load drops to 80% of the peak load), and record the peak load F (unit: N); calculate the compressive strength according to the formula f cu =F / A (A is the pressure area of the test piece, unit: m 2 ); take the average value of the 3 groups of test pieces as the test result, if the deviation of a single group of data from the average value is more than 15%, remove it and retest.

[0101] 3. 28d flexural strength test: specimen preparation: prepare the slurry according to the formula, pour into a 40mmx40mmx160mm prism mold, shape and cure to 28d, select 3 groups of specimens without cracks, no missing edges and corners for standby.

[0102] Test equipment: microcomputer control universal testing machine (with three-point bending test fixture, loading accuracy ±1%), vernier caliper;

[0103] Test process: measure the width b and height h of the cross section of the specimen with vernier caliper, measure 3 times and take the average value; place the specimen on the three-point bending fixture, set the span to 100mm, ensure that the load line coincides with the center line of the cross section of the specimen; load at a uniform speed of 0.05MPa / s until the specimen breaks, record the maximum load F (unit: N) at the time of fracture; calculate the flexural strength according to the formula f f =3FL / (2bh 2 ) (L is the span, unit: m), take the average value of 3 groups of specimens as the test result.

[0104] 4. Compression-bending ratio calculation: calculation process: extract the average value of 28d compressive strength f cu and the average value of 28d flexural strength f f of the same group of specimens; calculate according to the formula compression-bending ratio=f cu / f f , the result is rounded to two decimal places.

[0105] 5. Energy dissipation rate test: specimen preparation: same as the 100mmx100mmx100mm cube specimen for compressive strength test, cured to 28d.

[0106] Test equipment: microcomputer control electro-hydraulic servo universal testing machine (with displacement sensor, data acquisition frequency≥100Hz), stress-strain analysis software;

[0107] Test process: prepare the specimen according to the specimen processing and installation requirements of the compressive strength test; perform uniaxial compression test at a loading speed of 0.5MPa / s, synchronously collect load-displacement data until the specimen fails; convert the load-displacement curve into stress-strain curve (stress=load / pressure area, strain=displacement / specimen height) through analysis software; calculate the area enclosed by the stress-strain curve and the horizontal axis (i.e. absorbed energy W), calculate the energy dissipation rate according to the formula η=W / (f cu ×ε u ) (ε u is the strain corresponding to the peak stress), take the average value of 3 groups of specimens as the test result.

[0108] 6. Transverse deformation test: Test piece preparation: 40 mm x 40 mm x 160 mm prism test piece as in the flexural strength test, cured to 28 d.

[0109] Test equipment: universal testing machine (with transverse displacement sensor, accuracy ±0.001 mm), three-point bending fixture;

[0110] Test process: Fix the test piece according to the installation method of the flexural strength test, symmetrically install transverse displacement sensors on both sides of the cross section of the test piece, adjust the sensor to fit the surface of the test piece without pre-tightening; load at a speed of 0.05 MPa / s, record the transverse displacement data in real time; when the test piece reaches the peak value of the flexural strength, stop loading, read the maximum transverse displacement value at this time, and take the average value of 3 groups of test pieces as the test result.

[0111] 7. Flowability test: Test piece preparation: prepare the concrete paste according to the formula of the examples / counterexamples, and use it immediately after mixing is completed (the time from mixing completion to test start is ≤5 min).

[0112] Test equipment: cement mortar flowability tester (jump table, amplitude 10 mm, frequency 1 / s), truncated cone circular mold (upper diameter 36 mm, lower diameter 60 mm, height 60 mm), caliper (accuracy 0.1 mm), scraper;

[0113] Test process: Clean the jump table surface and adjust it to a horizontal state, place a clean glass plate in the center of the table; place the truncated cone circular mold in the center of the glass plate, pour the concrete paste into the mold, and use the scraper to flatten it along the mold opening after filling, remove the excess paste; slowly lift the truncated cone circular mold vertically upward (lifting time ≤5 s), ensuring that the paste is not disturbed; start the jump table and continuously jump for 25 times (completed within 25 s), then measure the diameters of the two perpendicular directions of the paste diffusion circle after stopping, and take the average value as the flowability test result (unit: mm).

[0114] 8. Frost resistance grade test: Test piece preparation: 100 mm x 100 mm x 100 mm cubic test piece as in the compressive strength test, cured to 28 d, then select 3 groups of test pieces and immerse them in water at 20℃ for 48 h for standby.

[0115] Test equipment: rapid freeze-thaw tester (temperature control range -20℃~5℃, temperature uniformity ±2℃), electronic balance, compressive strength tester;

[0116] Test process: Measure the initial mass m0and initial compressive strength f cu,0 of the test piece after immersion.

[0117] Put the test piece into the freeze-thaw testing machine, and perform freeze-thaw test according to the cycle of “-18℃ freezing for 4h→20℃ thawing for 4h”. After 50 cycles, remove the test piece, wipe off the surface water, and measure the mass loss rate (Δm=(m0−m n ) / m0×100%) and the compressive strength f cu,n ;

[0118] When the mass loss rate of the test piece exceeds 5% or the compressive strength loss rate (Δf=(f cu,0 −f cu,n ) / f cu,0 ×100%) exceeds 25% after a cycle, stop the test; and take the maximum cycle number when the strength loss rate is ≤25% as the frost resistance grade (for example, F180 if 180 cycles are qualified).

[0119] 9. Impermeability grade test: Test piece preparation: prepare the slurry according to the formula, pour it into a Φ175mm×Φ185mm×150mm circular table impermeability test mold, and after vibration molding, cure it for 28d, and select 3 groups of test pieces for standby.

[0120] Test equipment: concrete impermeability instrument (pressure range 0-4MPa, pressure accuracy ±0.01MPa), sealing material (paraffin+rosin=3:1), vernier caliper;

[0121] Test process: seal the side surface of the test piece with the sealing material, and place it in the impermeability test mold seat to ensure good sealing and no water leakage; start the impermeability instrument, first pass in 0.2MPa water pressure, maintain constant pressure for 2h, and observe whether there is water seepage on the end surface of the test piece; if there is no water seepage, increase the water pressure by 0.1MPa every 1h until water seepage appears on the end surface of the test piece (water seepage in 2 or more of the 3 groups of test pieces is considered as penetration); record the maximum water pressure P (unit: MPa) when the test piece is impermeable, and determine the impermeability grade according to the impermeability grade classification standard (for example, S10 if the maximum water pressure is 1.0MPa).

[0122] 10. Carbonation depth test: Test piece preparation: same as the 100mm×100mm×100mm cube test piece in the compressive strength test, and after curing for 28d, grind the surface of one side of the test piece for standby.

[0123] Test equipment: carbonation test box (CO2 concentration 20%±3%, temperature 20℃±2℃, humidity 70%±5%), cutting machine, phenolphthalein reagent (1% ethanol solution), vernier caliper (accuracy 0.02mm);

[0124] Test process: Put the test piece into the carbonization test box and continuously carbonize for 28 days (keep the environmental parameters in the box stable during the period); take out the test piece, cut it along the direction parallel to the ground surface using a cutting machine to obtain a fresh cross section; immediately spray phenolphthalein reagent on the cross section to evenly cover the entire cross section and stand for 30 s; observe the color change of the cross section, the uncarbonized part is red, the carbonized part does not change color, measure the distance from the carbonized edge to the surface of the test piece with a vernier caliper, evenly select 4 measurement points on the cross section, and take the average value as the carbonization depth (unit: mm).

[0125] 11. Patch mortar setting time test: Test piece preparation: prepare a sulphoaluminate cement composite mortar (sulphoaluminate cement content 10%-15%) according to the formulation of the example, and immediately use after uniform stirring.

[0126] Test equipment: Vicat apparatus (with initial setting needle and final setting needle), cement neat mortar mixer, curing box (temperature 20℃±2℃, humidity 90%±5%), electronic balance;

[0127] Test process: weigh 500g of mortar, pour it into the test mold, flatten it with a scraper, and put it into the curing box for curing; initial setting time test: start timing from the completion of stirring, and insert the initial setting needle (diameter 1.13mm) vertically into the surface of the mortar every 15 min, measure the penetration degree, and when the penetration degree is ≤3mm, record the time as the initial setting time; final setting time test: continue to cure after initial setting, and insert the final setting needle (diameter 1.13mm, needle end with annular accessory) vertically into the surface of the mortar every 30 min, when the penetration degree is ≤0.5mm, record the time as the final setting time; take the average value of the test results of 3 groups of test pieces, accurate to 0.1h.

[0128] 12. 3d compressive strength test of patch mortar: Test piece preparation: prepare the patch mortar according to the formulation, pour it into a 40mm×40mm×160mm prism mold, and after vibration molding, cure it in an environment of 20℃±2℃, humidity 90%±5% for 3d, and select 3 groups of test pieces for standby.

[0129] Test equipment: universal testing machine (loading accuracy ±1%), test piece grinding machine;

[0130] Test process: grind the upper and lower pressure surfaces of the test piece with the grinding machine to ensure that the surface flatness meets the requirements; place the test piece in the center of the pressure plate of the testing machine, and uniformly load at a loading speed of 0.5MPa / s until the test piece is damaged, and record the peak load; calculate the compressive strength according to the formula f cu =F / A, and take the average value of 3 groups of test pieces as the test result.

[0131] The results are shown in Tables 1-5 as follows:

[0132] Table 1 Performance test data of Example 1-Example 2

[0133]

[0134] Table 2 Performance test data of Example 3-Example 4

[0135]

[0136] Table 3 Performance test data of Comparative Example 1-Comparative Example 2

[0137]

[0138] Table 4 Performance test data of Comparative Example 3-Comparative Example 4

[0139]

[0140] Table 5 Performance test data of Comparative Example 5-Comparative Example 6

[0141]

[0142] Data analysis:

[0143] As can be seen from Tables 1-5, Examples 1-4 all contain a complete synergistic additive system, and Comparative Examples 1, 2, and 3 are controls:

[0144] The dry density (1650-1700 kg / m 3 ) of Examples 1-4 is reduced by 27.6%-30.0% compared to Comparative Example 1 (2350 kg / m 3 ), by 6.6%-9.3% compared to Comparative Example 2 (1820 kg / m 3 ), and by 12.8%-15.4% compared to Comparative Example 3 (1950 kg / m 3 ). This shows that the pore-forming of the high molecular water-absorbing resin and the lightweight synergism of talc greatly reduce the material density and achieve the design goal of reducing the weight of the truck scale by 30%-50%.

[0145] Buffering and strength balance: The energy dissipation rate (28.5%-31.5%) of Examples 1-4 is increased by 80.4%-99.4% compared to Comparative Example 1 (15.8%), by 27.8%-41.3% compared to Comparative Example 2 (22.3%), and by 72.7%-90.9% compared to Comparative Example 3 (16.5%); at the same time, the compressive strength (215-245 MPa) is only increased by 7.5%-22.5% compared to Comparative Example 3 (200 MPa) and by 19.4%-36.1% compared to Comparative Example 1 (180 MPa). This proves that the porous structure of the high molecular water-absorbing resin improves the buffering energy dissipation, the talc optimizes the particle size distribution to ensure the strength, and the two achieve a balance of "high strength + high buffering".

[0146] Flexibility optimization: The folding ratio (1.91-1.96) of Examples 1-4 is close to Comparative Example 3 (1.90) and far lower than Comparative Examples 1 (2.12) and 2 (2.17); the transverse deformation (5.2-5.8 mm) is increased by 36.8%-52.6% compared with Comparative Example 1 (3.8 mm), indicating that the flaky structure of talc dominates the flexibility improvement, the water-absorbing resin does not affect the flexibility, and the two functions are complementary.

[0147] In addition, the water-absorbing resin in Examples 1-4 is pretreated by "expanding + air drying + sodium carbonate soaking", and Comparative Example 4 (water-absorbing resin without pretreatment) is used as a control:

[0148] Uniformity of pore formation is improved: The energy dissipation rate (28.5%-31.5%) of Examples 1-4 is increased by 41.8%-56.7% compared with Comparative Example 4 (20.1%), and the transverse deformation (5.2-5.8 mm) is increased by 20.9%-34.9% compared with Comparative Example 4 (4.3 mm). Pretreatment makes the water-absorbing resin form pores more uniformly, avoids local pores from being too large to cause strength fluctuations, and ensures stable cushioning performance.

[0149] Durability is strengthened: The frost resistance grade (F180-F220) of Examples 1-4 is increased by 38.5%-69.2% compared with Comparative Example 4 (F130), and the carbonation depth (6.8-7.8 mm) is decreased by 29.1%-38.2% compared with Comparative Example 4 (11.0 mm). Uniform pore structure reduces stress concentration during freeze-thaw cycles, delays carbonation diffusion, and improves long-term service life.

[0150] The talc and fly ash floating beads in Examples 1-4 are mixed together, and Comparative Example 5 (only talc is mixed) is used as a control:

[0151] The fluidity (162-170 mm) of Examples 1-4 is increased by 5.9%-11.1% compared with Comparative Example 5 (153 mm). The "ball effect" of fly ash floating beads and the filling effect of talc are synergistic, reducing inter-particle friction, improving construction fluidity, and meeting the pumping and pouring requirements.

[0152] Strength and flexibility balance: The compressive strength (215-245 MPa) of Examples 1-4 is increased by 13.2%-28.9% compared with Comparative Example 5 (190 MPa), and the transverse deformation (5.2-5.8 mm) is increased by 15.6%-28.9% compared with Comparative Example 5 (4.5 mm). The mixed optimization of particle size distribution improves the density while retaining the flexibility, reducing the risk of construction cracks.

[0153] Examples 1-4 use a composite mortar with 15% of sulphoaluminate cement, and Comparative Example 6 (ordinary mortar) is used as a control:

[0154] Fast construction adaptation: The initial setting time of the repair mortar of examples 1-4 (1.0-1.3h) is shortened by 71.1%-77.8% compared with comparative example 6 (4.5h), which meets the rapid construction requirements of the installation and repair of truck scales, and shortens the construction period by more than 30%.

[0155] Early strength guarantee: The 3d compressive strength of the repair mortar of examples 1-4 (21.0-23.5MPa) is increased by 64.1%-83.6% compared with comparative example 6 (12.8MPa), which ensures the rapid loading of the repaired part and avoids structural hazards in later use.

[0156] In summary, examples 1-4 all achieve "dry density≤1700kg / m³+ compressive strength≥215MPa+ energy dissipation rate≥28.5%+ compression ratio≤1.96", which solves the pain points of traditional truck scales "heavy, brittle and weak buffering".

[0157] Durability meets standards: The frost resistance grade is≥F180, the impermeability grade is≥S10, and the carbonation depth is<8mm, which is increased by 30%-60% compared with the comparative example, the service life is extended to more than 30 years, and the maintenance cost is reduced.

[0158] Strong construction and adaptability: The fluidity of 162-170mm is suitable for pumping, the layered pouring process is suitable for complex structures, and the sulphoaluminate cement repair mortar meets the requirements of rapid construction, and is suitable for multiple scenes such as logistics, mines, bridge toll stations, etc.

[0159] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to suggest that the scope of the present application is limited to these examples; under the idea of the present application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for the sake of brevity.

[0160] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, omissions, and equivalents are intended to be encompassed by the present application.

Claims

1. A method for the preparation of a truck scale based on UHPC high performance lightweight concrete material, characterized by, The load-bearing body of the truck scale is made of UHPC high-performance lightweight concrete material, the concrete material includes the following mass parts of raw materials: cement 15-25 parts, silica fume 5-10 parts, hollow glass microbeads 2-4 parts, fly ash floating beads 5-10 parts, shale ceramsite 30-40 parts, steel fiber 1-3 parts, water reducing agent 1-2 parts, water 6-10 parts, and synergistic additive 7-13 parts; The synergistic additive includes high molecular water-absorbing resin and talcum powder, and the mass ratio of the high molecular water-absorbing resin and talcum powder is 2-5:5-8; The particle size of the talcum powder is 425 mesh, the water content is ≤0.5%, and the loss on ignition is ≤45%. The preparation method of the truck scale includes the following steps: Step S1. Raw material pretreatment: after the high molecular water-absorbing resin is completely soaked in clean water, it is initially dried at 50°C for 48h, then soaked in a sodium carbonate solution for 18h for standby, and the pretreated high molecular water-absorbing resin is obtained; the talcum powder and fly ash floating beads are uniformly pre-mixed to form a compound filler; Step S2. Dry material mixing: weigh the cement, silica fume, hollow glass microbeads, compound filler, shale ceramsite and steel fiber, add them into a mixer, dry mix for 3-5min to ensure uniform mixing of the raw materials, then add the pretreated high molecular water-absorbing resin and dry mix together; Step S3. Pre-mixing: add 70%-85% of the total water to the mixer and continue stirring for 5-8min to form a uniform pre-mix; Step S4. Rheological adjustment: add the remaining water and all water reducing agents to the pre-mix and stir for 3-5min to adjust the rheological properties of the concrete slurry so that the fluidity reaches 150-170mm to meet the pumping or pouring requirements; Step S5. Forming: pour the adjusted concrete slurry into a pre-set mold, use high-pressure forming or vibration forming process to remove internal bubbles, if the pouring height exceeds 3m, use layered pouring method, each layer pouring thickness is controlled within 0.3-0.8m, and the interval between adjacent layers is not more than 2h, and the pressure during high-pressure forming is 10-30MPa; Step S6. Curing: move the formed concrete component into a curing room and use any one of steam curing, high temperature and pressure curing, and normal temperature curing for curing, wherein the steam curing conditions are 70°C for 5 days, the high temperature and pressure curing conditions are 250-400°C, 5-20MPa environment curing, and the normal temperature curing time is not less than 7 days; Step S7. Demolding and processing: after curing is completed, remove the mold, and cut, polish and process the load-bearing body according to the design requirements of the truck scale; when there is a joint or repair requirement, use a composite mortar with 10%-15% of sulphoaluminate cement content for treatment; Step S8. Quality detection: perform quality detection on the finished product, and obtain the truck scale based on UHPC high-performance lightweight concrete material after all indicators meet the standards.

2. The method for preparing a truck scale based on UHPC high-performance lightweight concrete material according to claim 1, characterized in that, The cement is ordinary portland cement with a strength of ≥52.5MPa.

3. The method for preparing a truck scale based on UHPC high-performance lightweight concrete material according to claim 1, characterized in that, The specific surface area of the silica fume is ≥ 15000 m 2 / kg, SiO2 content > 92%.

4. The method for preparing a UHPC high-performance lightweight concrete material-based truck scale according to claim 1, characterized in that, The high molecular water-absorbing resin has a particle size of 10-20 mesh and an apparent density of 350-450 kg / m 3 .

5. The method for preparing a UHPC high performance lightweight concrete material based truck scale according to claim 1, characterized in that, The apparent density of the hollow glass microsphere is 350-450 kg / m 3 The particle size is 150-200 μm.

6. The method for preparing a UHPC high performance lightweight concrete material based truck scale according to claim 1, characterized in that, The fly ash floating bead has a particle size of 20-40 mesh and an apparent density of 500-520 kg / m 3 .

7. The method for preparing a UHPC high performance lightweight concrete material based truck scale according to claim 1, characterized in that, The apparent density of the shale ceramic is 1300-1400 kg / m3; the length of the steel fiber is 10-20 mm, and the diameter is 0.2-0.5 mm; the water reducing agent is polycarboxylic acid water reducing agent powder, and the water reducing rate is 35%-40%.

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