Super-tough cement seamless splicing structure and construction method thereof

Abstract

The present application relates to the technical field of bridge and tunnel seamless splicing, and particularly relates to a super-tough cement seamless splicing structure and a construction method. Technical points of the present application are as follows: the super-tough cement seamless splicing structure is arranged in a road surface cushion structure, and is a seamless splicing structure composed of a base layer, a road surface cushion, a super-tough cement structure, a paving surface layer and a filling sealing strip; rough glue surface splicing is adopted, concave-convex rough surfaces and an interface agent are used, a physical-chemical combination mode is adopted to strengthen the connection, and a wedge-shaped clamping groove limiting and fixing and staggered structure are arranged; the super-tough cement splicing material comprises dry mixture, nano active powder, composite fiber, additive and water; the high-strength interface agent comprises two components of epoxy resin and curing agent. The super-tough cement seamless splicing structure provided by the present application is suitable for bridge and tunnel engineering construction, can meet the demand of long-life seamless pavement, and provides reliable guarantee for driving safety and comfort performance.

Description

Technical Field

[0001] This invention relates to the field of seamless bridge and tunnel splicing technology, specifically to an ultra-tough cement seamless splicing structure and its construction method. Background Technology

[0002] With social progress and rapid transportation development, bridge and tunnel expansion joints have become one of the key technologies in steel bridge construction. Seamless splice joints, as a type of expansion joint, can maximize the deformation coordination with the road structure, while also having good adhesion to road materials, maintaining the smoothness of the road surface and the comfort of driving. Therefore, they are frequently used in road construction.

[0003] With the continuous development and expansion of my country's expressways, traffic volume is increasing daily, especially the proportion of truck traffic. The joint structures of bridges and tunnels are subject to complex stresses and have always been a weak link in the pavement structure. Conventional asphalt-based splicing materials have insufficient durability. Under the combined influence of factors such as changes in ambient temperature, repeated vehicle loads, and deformation of bridge and tunnel structural joints, splicing joints are increasingly showing problems of high stress, large deformation, and high-cycle fatigue damage, affecting the smoothness and comfort of driving on the road. Summary of the Invention

[0004] The purpose of this invention is to provide an ultra-tough cement seamless splicing structure and its construction method, which solves the problems of high stress, large deformation and high cycle fatigue damage in bridge and tunnel splicing joints, improves the overall durability of bridge and tunnel pavement structures, and enhances the smoothness and comfort of road driving.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] This invention provides a seamless splicing structure for ultra-tough cement, comprising, from bottom to top, a base layer, a road subbase, and a pavement surface layer; wherein, the road subbase includes spliced ​​ultra-tough cement structures, and the ultra-tough cement structures are connected to the road subbase and base layer by roughened adhesive surfaces; the width of the ultra-tough cement structure and the elongation of the ultra-tough cement structure material satisfy the following relationship:

[0007] ε=1.75f·L -1.64 ,

[0008] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0009] L represents the width of the ultra-tough cement structure, in mm;

[0010] f is an adjustment factor, in mm. -1 .

[0011] Furthermore, the value of f is 1.

[0012] This invention obtains the relationship between the elongation of the seamless splicing material of ultra-tough cement and the width of the ultra-tough cement structure through data fitting. The relationship shows that, while keeping the deformation of the ultra-tough cement structure constant, the smaller the width of the ultra-tough cement structure, the greater the elongation of the ultra-tough cement material should be. Otherwise, problems such as cracking at the splicing part and interface slippage will occur, leading to a decrease in the usability and durability of bridge and tunnel splice joints.

[0013] Furthermore, the width of the ultra-tough cement structure is 200–2000 mm; the elongation of the ultra-tough cement structure material is 0.5–2.5%.

[0014] Furthermore, calculated by weight, the ultra-tough cement structural material includes the following components: 65-70 parts dry mix, 10-18 parts nano-active powder, 14-22 parts composite fiber, 1-2 parts shrinkage-reducing admixture, and 3-5 parts water.

[0015] Furthermore, the amounts of composite fibers and shrinkage-reducing additives added satisfy the following relationship:

[0016] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0017] p and q are adjustment coefficients, with units of g. -1 ;

[0018] m1 is the amount of composite fiber added, in grams;

[0019] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0020] Furthermore, the values ​​of p and q are both 1.

[0021] This invention uses the above formula to adjust the ratio of composite fibers and shrinkage-reducing additives in the material composition formula according to the elongation of the ultra-tough cement structure material, thereby obtaining a material composition more suitable for the width of the ultra-tough cement structure, making the deformation of the ultra-tough cement structure more reasonable, and greatly improving the durability of bridge and tunnel joints and the comfort of road driving.

[0022] Furthermore, calculated by weight, the dry mix includes the following components: 55-70 parts cement, 20-30 parts quartz sand powder, 8-15 parts fly ash, and 4-10 parts steel slag powder.

[0023] Furthermore, the composite fiber includes any one or more of steel fibers, polyethylene fibers, or basalt fibers, or a mixture thereof.

[0024] Furthermore, the shrinkage-reducing admixture is a mixture of magnesium oxide expanding agent and polycarboxylate superplasticizer, wherein the mass ratio of magnesium oxide expanding agent to polycarboxylate superplasticizer is (2-5):1.

[0025] Furthermore, the nano-active powder is any one or a mixture of two of ultrafine calcium carbonate or silicon dioxide with a particle size of 20-800 nm.

[0026] Furthermore, the splicing interface between the ultra-tough cement structure and the road subbase is provided with a wedge-shaped groove for limiting and fixing the ultra-tough cement structure and the road subbase.

[0027] Furthermore, the cross-section of the wedge-shaped groove is an inverted trapezoid, with an upper opening width of 100-200mm, a lower opening width of 50-100mm, a depth of 50-80mm, a length of 300-900mm, a spacing of 300-600mm, a step height of 150-200mm, and a step surface width of 250-350mm.

[0028] Furthermore, the wedge-shaped slots are staggered, with a staggered platform width of 200–500 mm and an upper and lower step height of 100–200 mm.

[0029] In this invention, the above-mentioned structure increases the splicing connection surface, thereby increasing the bonding stress, while avoiding the occurrence of through-and-through splicing cracks and ensuring the stability of the overall structure.

[0030] Furthermore, a sealing strip is installed at the joint between the base layer and the road subbase.

[0031] Furthermore, the filling sealing strip is made of rubber, sponge or steel, with a diameter of 12 to 20 mm, and its shape is not limited to round, square or other irregular shapes.

[0032] Furthermore, the surface of the filling sealant is flush with the base layer.

[0033] Furthermore, in the ultra-tough cement structure, prestressed portal frame reinforcement is also provided along the length direction. The prestressed portal frame reinforcement includes an inverted Ω-bending stress reinforcement, at least one inverted U-embedded reinforcement, and at least one splice surface transverse anchor reinforcement.

[0034] The protruding part in the middle of the inverted U-shaped pre-embedded bar is connected to the concave part of the inverted Ω-shaped bent reinforcing bar. The end of the inverted Ω-shaped bent reinforcing bar overlaps with one end of the transverse anchor bar of the splice surface. The height of the end of the inverted Ω-shaped bent reinforcing bar is higher than the height of the transverse anchor bar of the splice surface.

[0035] In this invention, the ultra-tough cement structure can be cast on-site or prefabricated; the prefabricated module is 0.5 to 4m in length. According to the reserved wedge-shaped slot fixing position, high-strength interface agent and ultra-tough cement are injected sequentially along the inverted U-shaped reinforcement hole and the transverse anchoring reinforcement hole, saving on-site road construction time. At the same time, considering the convenience of later maintenance, modular replacement is quick and easy.

[0036] Furthermore, the diameter of the prestressed portal frame reinforcement is 12-20mm, the height of the bending reinforcement is 150-250mm, the distance from the bottom surface to the foundation layer is 50-150mm, and the prestressing tension is 2-12MPa.

[0037] Furthermore, the roughened rubber surface consists of a roughened uneven surface and a high-strength interface layer coated on the roughened uneven surface, which is formed by milling the original road surface.

[0038] Furthermore, the roughness of the roughened surface and the coating amount of the high-strength interface agent used in the high-strength interface layer satisfy the following relationship:

[0039] k·Ah a +c·Bw b =1;

[0040] Where A is the ratio of the interfacial interlocking force to the interfacial connection resultant force, and the unit is 1;

[0041] h is roughness, which reflects the height difference between the unevenness of the interface, and the unit is mm;

[0042] w represents the coating amount of the high-strength interface agent, measured in kg / m². 2 ;

[0043] B is the ratio of chemical bonding force to the resultant force of interfacial bonding, and the unit is 1;

[0044] a and b are exponential constants, with a unit of 1;

[0045] k is an adjustment factor, in mm. -1 ;

[0046] c is the adjustment factor, with a unit of 1 × 10⁻⁶. 6 mm 2 / kg.

[0047] Furthermore, the exposed aggregate of the roughened surface is 25-35% of the maximum aggregate size.

[0048] Furthermore, the roughness of the roughened surface is 5-10 mm, and the treated area is ≥90%.

[0049] In this invention, the interface roughness is controlled within the range of 5–10 mm, corresponding to a high-strength interface agent coating amount of 0.8–1.2 kg / m². 2Furthermore, it is required that the exposed aggregate ratio be 25-35% of the maximum particle size. The reason is that the coarse aggregate particle size in concrete is generally less than 20mm, and the roughness is 5-10mm, that is, the unevenness of the rough surface is within the range of 5-10mm. With 25-35% of the aggregate particle size exposed, the laitance and loose cement stone on the concrete surface can be removed, and the reliability of the interface connection can be strengthened. If the unevenness of the rough surface is <5mm, the laitance is not completely removed, and the interlocking force formed by the unevenness is insufficient. If the unevenness of the rough surface is >10mm, less than 50% of the aggregate is covered by cement, and the embedding force is not firm, which can easily cause the aggregate to loosen.

[0050] Furthermore, calculated by weight, the high-strength interface agent is a condensation product composed of the following components: 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester, and 16-28 parts of amide-amine curing agent; the coating amount of the high-strength interface agent is 0.8-1.2 kg / m². 2 .

[0051] Furthermore, the unsaturated polyester is made by polycondensation reaction of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinking agent. The acidity is 40-60 mg KOH / g, which can promote full reaction and avoid volatilization that affects quality.

[0052] Furthermore, the mass ratio of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinking agent is 2:3:4:1, and the temperature of the polycondensation reaction is controlled at 180-220℃.

[0053] Furthermore, the amide curing agent is obtained by polycondensation reaction of diglycidyl ester and diethylenetriamine, with an amine value of 220-380 mg KOH / g, ensuring excellent flexibility and impact resistance, while also having excellent adhesion properties.

[0054] This invention also provides a construction method for an ultra-tough cement seamless splicing structure, which utilizes a combination of textured surfaces and interface agents in a physical and chemical manner, and increases the connection surface by setting up the substrate and slots to strengthen the connection, thereby ensuring the overall performance of the ultra-tough cement seamless splicing structure.

[0055] The construction method provided by this invention includes the following steps:

[0056] S1. Remove the construction site of the ultra-tough cement structure, remove excess roadbed on the foundation layer, and set wedge-shaped grooves;

[0057] S2. At the construction location of the tough cement structure of the road subbase and foundation layer, roughened uneven surfaces are set;

[0058] S3. Install a filling and sealing strip at the expansion joint location;

[0059] S4. Install prestressed portal frame at the construction location of the ultra-tough cement structure;

[0060] S5. Apply a high-strength interface agent to the roughened surface of the uneven surface.

[0061] S6. Prepare the ultra-tough cement structure material, pour the ultra-tough cement structure material into the construction position of the ultra-tough cement structure, and vibrate and level it.

[0062] S7. After the ultra-tough cement structural material has initially set, smooth and finish the surface, and lay the paving surface layer after curing.

[0063] Furthermore, the above construction method is specifically as follows:

[0064] S1. Remove excess padding at the joint of the super-tough cement, and set staggered wedge-shaped grooves. The step height is 150-200mm, the step surface width is 250-350mm, the groove top width is 100-200mm, the bottom width is 50-100mm, the depth is 50-80mm, the length is 300-900mm, and the spacing is 300-600mm.

[0065] S2. A rough rubber surface is laid on the connection surface between the road subbase and the base layer and the ultra-tough cement structure. The roughness of the uneven surface is 5-10mm, the treatment area is ≥90%, the aggregate is exposed 25-35%, and the residual particles are cleaned.

[0066] S3. Install rubber, sponge or steel filling and sealing strips at the expansion joint location. The diameter is 12-20mm and the shape is not limited to round, square or other irregular shapes. The surface is flush with the structural base layer.

[0067] S4. Install the prestressed tendon frame, including the bending reinforcing bars and the gantry embedded bars. The diameter of the reinforcing bars is 12-32mm. The bending reinforcing bars are inverted Ω-shaped with a height of 150-250mm. The bottom surface is 50-150mm away from the foundation layer. Set the prestressing tension to 2-12MPa.

[0068] S5. A high-strength interface agent is prepared by weight-based methods using 55–65 parts of polyhydroxy epoxy resin, 10–15 parts of isocyanate polyurethane, 5–12 parts of unsaturated polyester, and 16–28 parts of amide-amine curing agent, with a coating weight controlled at 0.8–1.2 kg / m². 2 ;

[0069] S6. According to the weight parts, prepare super-tough cement with 65-70 parts of dry mix, 10-18 parts of nano-active powder, 14-22 parts of composite fiber, 1-2 parts of shrinkage reduction admixture and 3-5 parts of water, wherein the dry mix includes 55-70 parts of high-performance cement, 20-30 parts of quartz sand powder, 8-15 parts of fly ash and 4-10 parts of steel slag powder, and prepare super-tough cement structural materials;

[0070] S7. The ultra-tough cement is poured evenly and compacted. After initial setting, the surface is smoothed and polished, and water mist is sprayed for moisturizing and curing. The paving surface can be applied after 7 days.

[0071] Furthermore, the construction method provided by this invention involves prefabrication of ultra-tough cement structures followed by on-site assembly, specifically including:

[0072] S1. Select and assemble prefabricated ultra-tough cement structure modules according to actual site needs. The modules are 0.5-4m in length, with a stepped cross-section that is wider at the top and narrower at the bottom. The modules also protrude downwards on both sides to form wedge-shaped interlocking clips. The top and bottom widths are 1-3cm smaller than the width at the splicing point.

[0073] S2. Install prestressed tendon frame, including bending reinforcing bars and gantry embedded bars. The bar diameter is 12-32mm. The bending reinforcing bars are inverted Ω-shaped with a height of 150-250mm and a bottom distance of 50-150mm from the foundation layer. Set the prestressing tension to 2-12MPa. Produce ultra-tough cement structure in the factory and leave corresponding U-shaped bar holes and transverse anchoring bar holes.

[0074] S3. Wedge-shaped slots are reserved at the on-site splicing parts. Remove internal debris. The step height is 150-200mm, the step surface width is 250-350mm, the upper width of the slot is 100-200mm, the lower width is 50-100mm, the depth is 50-80mm, the length is 300-900mm, and the spacing is 300-600mm.

[0075] S4. After the precast ultra-tough cement structure components have reached 80% of their design strength, high-strength interface agent and ultra-tough cement are injected sequentially along the inverted U-shaped reinforcement holes and transverse anchoring reinforcement holes according to the reserved wedge-shaped slot fixing position. This saves on-site road construction time and also considers the convenience of later maintenance, allowing for modular replacement quickly and easily.

[0076] In summary, the present invention has the following beneficial effects:

[0077] (1) This invention discloses a construction method for a super-tough cement seamless splicing structure agent, which includes a base layer, a road sub-layer, super-tough cement, a pavement surface layer, and a filling and sealing strip. The splicing interface adopts a rough adhesive surface and is equipped with a wedge-shaped groove for limiting and fixing and a staggered joint structure. By combining the rough surface and the physical and chemical properties of the interface agent, the bonding force between the splicing structure and the original road surface is greatly improved, ensuring the overall performance of the super-tough cement seamless splicing structure while ensuring the comfort of driving on the road.

[0078] (2) The super-tough cement splicing material provided by the present invention includes dry mix, nano-active powder, composite fiber, admixture and water; the high-strength interface agent includes two components: epoxy resin and curing agent; it is suitable for bridge and tunnel construction, can meet the requirements of long-life seamless pavement, and provide reliable guarantee for driving safety and comfort performance. Attached Figure Description

[0079] Figure 1 This is a schematic diagram of the ultra-tough cement seamless splicing structure of the present invention;

[0080] Figure 2 This is a top view of the ultra-tough cement seamless splicing structure of the present invention;

[0081] Figure 3 This is a schematic diagram of the ultra-tough cement structure of the present invention;

[0082] Figure 4 This is a schematic diagram of the prefabrication of the ultra-tough cement structure of the present invention;

[0083] Figure 5 It is a fitting curve of the width of the ultra-tough cement structure of the present invention and the elongation of the ultra-tough cement structure material;

[0084] Figure 6 This is a fitting curve of the elongation of the ultra-tough cement structural material of this invention versus the amount of composite fiber and shrinkage-reducing admixture added.

[0085] Figure Labels

[0086] 1. Base layer, 2. Road subbase, 3. Ultra-tough cement structure, 4. Pavement surface layer, 5. Filler sealing strip, 6. Rough rubber surface, 7. Wedge groove, 81. Inverted Ω-shaped bent reinforcing bar, 82. Inverted U-shaped embedded bar, 83. Splice surface transverse anchor bar, 31. U-shaped bar position hole, 32. Transverse anchor bar position hole. Detailed Implementation

[0087] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific implementation method, features and effects of the ultra-tough cement seamless splicing structure and its construction method proposed according to the present invention are described in detail below.

[0088] Source of raw materials:

[0089] Cement: Conch High-Performance Portland Cement P·II 52.5;

[0090] Quartz sand powder: Quartz sand produced in Huanggang, Hubei Province;

[0091] Fly ash: Fly ash produced in Shijiazhuang, Hebei Province;

[0092] Steel slag powder: Steel slag from Zibo, Shandong;

[0093] Ultrafine calcium carbonate: 200-2500 mesh nano calcium carbonate;

[0094] Polyethylene fiber: Toray PVA from Japan;

[0095] Shrinkage reducing additive: Magnesium expanding agent KBS-M5;

[0096] Polyhydroxy epoxy resin: Huayi AFG-90 hydroxy resin, purity 99.9%;

[0097] Isocyanate polyurethane: BASF isocyanate M20S;

[0098] Maleic anhydride: maleic anhydride / CAS 108-31-6;

[0099] Phthalic anhydride: phthalic anhydride (PA)C8H4O3;

[0100] Styrene crosslinking agent: Luxi YS041 styrene;

[0101] Diglycidyl ester: TCI diglycidyl ester;

[0102] Diethylenetriamine: Merck D93856 reagent, 99% concentration;

[0103] Steel fiber: Copper-plated steel fiber, 2850MPa;

[0104] Polyethylene fiber: Toray PVA from Japan;

[0105] Basalt fiber: Jiangsu Sky BF;

[0106] Magnesium oxide expanding agent: Magnesium expanding agent KBS-M5;

[0107] Polycarboxylate superplasticizer: Jiangsu Subote high-efficiency superplasticizer;

[0108] Calcium carbonate: 200-2500 mesh nano calcium carbonate;

[0109] Silicon dioxide: 30±5nm silicon dioxide.

[0110] This specific embodiment provides an ultra-tough cement seamless splicing structure, such as Figure 1 As shown, from bottom to top, it includes a base layer 1, a road subbase 2, and a pavement surface layer 4; wherein, the road subbase 2 includes a spliced ​​ultra-tough cement structure 3, and the ultra-tough cement structure 3 is connected to the road subbase 2 and the base layer 1 by a rough adhesive surface 6; the width of the ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material satisfy the following relationship, and the fitting curve is shown in [reference needed]. Figure 5 :

[0111] ε=1.75f·L -1.64 ,

[0112] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0113] L represents the width of the ultra-tough cement structure 3, in mm;

[0114] f is an adjustment factor, in mm. -1 .

[0115] The value of f is 1.

[0116] In some preferred embodiments, the width of the ultra-tough cement structure 3 is 200-2000 mm, and the elongation of the ultra-tough cement structure material is 0.5-2.5%.

[0117] The ultra-tough cement structural material, calculated by weight, comprises the following components: 65-70 parts dry mix, 10-18 parts nano-active powder, 14-22 parts composite fiber, 1-2 parts shrinkage-reducing admixture, and 3-5 parts water.

[0118] In practical engineering, the material at seamless joints exhibits good resistance to deformation, i.e., elongation. In this specific embodiment, the seamless joint width of the ultra-tough cement concrete is 200–2000 mm. The smaller the joint width, the higher the elongation requirement for the material. The corresponding elongation range for ultra-tough cement is 0.5–2.5%. The elongation of ultra-tough cement material is mainly affected by the dosage of composite fibers and shrinkage-reducing admixtures. The addition amounts of composite fibers and shrinkage-reducing admixtures satisfy the following relationship, and the fitted curve is shown in [the figure]. Figure 6 :

[0119] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0120] p and q are adjustment coefficients, with units of g. -1 ;

[0121] m1 is the amount of composite fiber added, in grams;

[0122] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0123] In this case, the values ​​of p and q are both 1.

[0124] In some preferred embodiments, the composite fiber is made of, but is not limited to, any one or a mixture of steel fiber, polyethylene fiber or basalt fiber; the shrinkage reducing additive is a mixture of magnesium oxide expanding agent and polycarboxylate superplasticizer.

[0125] In some preferred embodiments, the dry mix comprises the following components by weight: 55-70 parts cement, 20-30 parts quartz sand powder, 8-15 parts fly ash, and 4-10 parts steel slag powder.

[0126] In some preferred embodiments, the nano-active powder is any one or a mixture of two of ultrafine calcium carbonate or silicon dioxide with a particle size of 20-800 nm.

[0127] In this specific implementation, such as Figure 1 and 2 As shown, the splicing interface between the ultra-tough cement structure 3 and the road subbase 2 is provided with a wedge-shaped groove 7, which is used to limit and fix the ultra-tough cement structure 3 and the road subbase 2.

[0128] In some preferred embodiments, the wedge-shaped slot 7 has an inverted trapezoidal cross-section with an upper opening width of 100-200mm, a lower opening width of 50-100mm, a depth of 50-80mm, a length of 300-900mm, a spacing of 300-600mm, a step height of 150-200mm, and a step surface width of 250-350mm. In some preferred embodiments, the wedge-shaped slots 7 are staggered, with a staggered platform width of 200-500mm and an upper and lower step height of 100-200mm.

[0129] like Figure 1 and 2 As shown, a filling sealing strip 5 is also provided at the joint between the base layer 1 and the road subbase 2.

[0130] In some preferred embodiments, the filling sealing strip 5 is preferably made of rubber, sponge or steel, with a diameter of 12 to 20 mm, and its shape is not limited to round, square or other irregular shapes; the surface of the filling sealing strip 5 is flush with the base layer 1.

[0131] like Figure 1 As shown, in the ultra-tough cement structure 3, prestressed portal reinforcement is also provided along the length direction. The prestressed portal reinforcement includes an inverted Ω-bending reinforcing bar 81, at least one inverted U-shaped embedded bar 82, and at least one splice surface transverse anchor bar 83. The middle protrusion of the inverted U-shaped embedded bar 82 is connected to the concave part of the inverted Ω-bending reinforcing bar 81. The two ends of the inverted Ω-bending reinforcing bar 81 are respectively connected to one end of the two splice surface transverse anchor bars 83. The height of the end of the inverted Ω-bending reinforcing bar 81 is higher than the height of the splice surface transverse anchor bar 83.

[0132] In some preferred embodiments, the diameter of the prestressed portal frame reinforcement is 12-20 mm, the height of the inverted Ω-bending reinforcing bar 81 is 150-250 mm, the distance between the bottom surface of the prestressed portal frame reinforcement and the foundation layer 1 is 50-150 mm, and the prestressing tension of the prestressed portal frame reinforcement is set to 2-12 MPa.

[0133] In this specific embodiment, the roughened adhesive surface 6 is composed of a roughened concave-convex surface and a high-strength interface layer coated on the roughened concave-convex surface. The roughened concave-convex surface is formed by milling the original road surface. The aggregate exposure rate of the roughened concave-convex surface is 25-35% of the maximum aggregate particle size, the roughness is 5-10 mm, and the treated area is ≥90%.

[0134] The roughness of the roughened surface and the amount of high-strength interface agent applied in the high-strength interface layer satisfy the following relationship:

[0135] k·Ah a +c·Bw b =1;

[0136] Where A is the ratio of the interfacial interlocking force to the interfacial connection resultant force, and the unit is 1;

[0137] h is roughness, which reflects the height difference between the unevenness of the interface, and the unit is mm;

[0138] w represents the coating amount of the high-strength interface agent, measured in kg / m². 2 ;

[0139] B is the ratio of chemical bonding force to the resultant force of interfacial bonding, and the unit is 1;

[0140] a and b are exponential constants, with a unit of 1;

[0141] k is an adjustment factor, in mm. -1 ;

[0142] c is the adjustment factor, with a unit of 1 × 10⁻⁶. 6 mm 2 / kg.

[0143] Therefore, the coating amount of the high-strength interface agent is 0.8–1.2 kg / m². 2 .

[0144] Based on parts by weight, the high-strength interface agent is a condensation product composed of the following components: 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester, and 16-28 parts of amide-amine curing agent.

[0145] In some preferred embodiments, the unsaturated polyester is prepared by polycondensation reaction of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinking agent, with an acidity of 40-60 mg KOH / g; the mass ratio of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinking agent is 2:3:4:1, and the polycondensation reaction temperature is controlled at 180-220°C; the amide curing agent is obtained by polycondensation reaction of diglycidyl ester and diethylenetriamine, with an amine value of 220-380 mg KOH / g.

[0146] This specific embodiment also provides a construction method for a seamless spliced ​​structure of ultra-tough cement, which specifically includes the following steps:

[0147] S1. Remove excess pavement sub-layer 2 from the foundation layer 1 at the construction location of the ultra-tough cement structure 3, and set wedge-shaped grooves 7.

[0148] S2. Roughened uneven surfaces are set at the construction locations of the ultra-tough cement structure 3 of the road subbase 2 and the base layer 1.

[0149] S3. Install the filling and sealing strip 5 at the expansion joint location;

[0150] S4. Install prestressed door frame at the construction location of ultra-tough cement structure 3;

[0151] S5. Apply a high-strength interface agent to the roughened surface of the uneven surface.

[0152] S6. Prepare the ultra-tough cement structure material, pour the ultra-tough cement structure material at the construction position of ultra-tough cement structure 3, and vibrate and level it.

[0153] S7. After the ultra-tough cement structural material has initially set, smooth and finish the surface, and lay the paving surface layer 4 after curing.

[0154] In some preferred embodiments, a construction method combining prefabrication of ultra-tough cement structures with on-site assembly can also be used, specifically including:

[0155] S1. Select and assemble modules according to actual site requirements. Precast ultra-tough cement structures consist of 3 modules, 0.5–4m in length, with a stepped cross-section that is wider at the top and narrower at the bottom. The modules protrude downwards on both sides to form wedge-shaped interlocks. The top and bottom widths are 1–3cm smaller than the width at the splicing point. Figure 3 As shown;

[0156] S2. Install the prestressed tendon frame, including inverted Ω-shaped bent reinforcing bars 81 and inverted U-shaped embedded bars 82. The diameter of the reinforcing bars is 12-32mm. The height of the inverted Ω-shaped bent reinforcing bars 81 is 150-250mm. The bottom surface is 50-150mm away from the foundation layer. The prestressing tension is 2-12MPa. The ultra-tough cement structure 3 is prefabricated in the factory, and U-shaped bar holes 31 and transverse anchoring bar holes 32 are correspondingly reserved.

[0157] S3. Wedge-shaped slots are reserved at the on-site splicing parts. Remove internal debris. The step height is 150-200mm, the step surface width is 250-350mm, the upper width of the slot is 100-200mm, the lower width is 50-100mm, the depth is 50-80mm, the length is 300-900mm, and the spacing is 300-600mm.

[0158] S4. After the precast ultra-tough cement structure components have reached 80% of their design strength, if Figure 4As shown, according to the fixed position of the reserved wedge-shaped groove 7, high-strength interface agent and ultra-tough cement are injected successively along the inverted U-shaped reinforcement hole 31 and the transverse anchoring reinforcement hole 32, saving on-site construction time for the road surface. At the same time, considering the convenience of later maintenance, modular replacement is quick and easy.

[0159] Example 1: A seamless spliced ​​structure of ultra-tough cement and its construction method

[0160] like Figure 1 As shown, from bottom to top, it includes a base layer 1, a road subbase 2, and a pavement surface layer 4; wherein, the road subbase 2 includes a spliced ​​ultra-tough cement structure 3, and the ultra-tough cement structure 3 is connected to the road subbase 2 and the base layer 1 by a rough adhesive surface 6; the splicing interface between the ultra-tough cement structure 3 and the road subbase 2 is provided with a wedge-shaped groove 7, which is used to limit and fix the ultra-tough cement structure 3 and the road subbase 2; a filling sealing strip 5 is also provided at the splicing joint between the base layer 1 and the road subbase 2.

[0161] Among them, the ultra-tough cement structure 3 has a width of 900mm, the wedge-shaped groove 7 has an inverted trapezoidal cross-section with an upper opening width of 120mm, a lower opening width of 60mm, a depth of 50mm, a length of 400mm, a spacing of 400mm, a step height of 150mm, and a step surface width of 270mm; the filling sealing strip 5 is a circle with a diameter of 12mm, the surface of which is flush with the base layer 1, and the material is rubber.

[0162] like Figure 1 As shown, in the ultra-tough cement structure 3, prestressed portal reinforcement is also provided along the length direction. The prestressed portal reinforcement includes an inverted Ω-bending reinforcing bar 81, two inverted U-shaped embedded bars 82, and two splice-face transverse anchor bars 83. The middle protrusion of the inverted U-shaped embedded bar 82 is connected to the concave part of the inverted Ω-bending reinforcing bar 81. The two ends of the inverted Ω-bending reinforcing bar 81 are respectively connected to one end of the two splice-face transverse anchor bars 83. The height of the end of the inverted Ω-bending reinforcing bar 81 is higher than the height of the splice-face transverse anchor bars 83.

[0163] The diameter of the prestressed portal frame reinforcement is 12mm, the height of the inverted Ω-bending reinforcing bar 81 is 150mm, the bottom surface of the prestressed portal frame reinforcement is 80mm from the foundation layer 1, and the prestressing tension of the prestressed portal frame reinforcement is set to 6MPa.

[0164] In this embodiment, the width of the ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material satisfy the following relationship: ε=1.75f·L -1.64 ,

[0165] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0166] L represents the width of the ultra-tough cement structure 3, in mm;

[0167] f is an adjustment factor, in mm. -1 The value is 1.

[0168] In this embodiment, the elongation of the ultra-tough cement structure material is 0.75.

[0169] According to the relation: The weight ratio of composite fiber to shrinkage-reducing additive is calculated to be 12.8.

[0170] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0171] p and q are adjustment coefficients, with units of g. -1 The value is 1;

[0172] m1 is the amount of composite fiber added, in grams;

[0173] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0174] Therefore, according to the weight parts, the specific components of the ultra-tough cement structural material used in this embodiment are as follows: 65 parts cement, 28 parts quartz sand powder, 10 parts fly ash, 6 parts steel slag powder, 13 parts ultrafine calcium carbonate with a particle size of 200nm, 16 parts polyethylene fiber, 1.25 parts shrinkage-reducing admixture, and 4 parts water. The shrinkage-reducing admixture is a mixture of magnesium oxide expanding agent and polycarboxylate superplasticizer, and the weight ratio of magnesium oxide expanding agent to polycarboxylate superplasticizer is 3.

[0175] In this embodiment, the roughened adhesive surface 6 further includes a roughened uneven surface and a high-strength interface layer coated on the roughened uneven surface. The roughness of the roughened uneven surface is 6 mm, and the aggregate exposure rate accounts for 30% of the maximum particle size. The roughness of the roughened uneven surface and the coating amount of the high-strength interface agent in the high-strength interface layer satisfy the following relationship:

[0176] k·Ah a +c·Bw b =1;

[0177] Where A is the ratio of the interfacial interlocking force to the interfacial connection resultant force, and the unit is 1;

[0178] h is roughness, which reflects the height difference between the unevenness of the interface, and the unit is mm;

[0179] w represents the coating amount of the high-strength interface agent, measured in kg / m². 2 ;

[0180] B is the ratio of chemical bonding force to the resultant force of interfacial bonding, and the unit is 1;

[0181] a and b are exponential constants, with a unit of 1;

[0182] k is an adjustment factor, in mm. -1 ;

[0183] c is the adjustment factor, with a unit of 1 × 10⁻⁶. 6 mm 2 / kg.

[0184] The coating weight of the high-strength interface agent is 0.95 kg / m². 2 .

[0185] The high-strength interface agent comprises the following components by weight: 58 parts of polyhydroxy epoxy resin, 12 parts of isocyanate polyurethane, 8 parts of unsaturated polyester, and 22 parts of amide-amine curing agent. The unsaturated polyester is produced by polycondensation of maleic anhydride, maleic acid, phthalic anhydride, and styrene crosslinking agent in a mass ratio of 2:3:4:1, with the polycondensation reaction temperature controlled at 195℃. The acidity of the unsaturated polyester is 46 mg KOH / g. The amide curing agent is obtained by polycondensation of diglycidyl ester and diethylenetriamine, with an amine value of 268 mg KOH / g.

[0186] This embodiment also provides a construction method for an ultra-tough cement seamless splicing structure, which specifically includes the following steps:

[0187] S1. Remove excess padding at the joint of the super-tough cement and set staggered wedge-shaped grooves 7;

[0188] S2. A rough rubber surface 6 is laid on the connection surface between the road subbase 2 and the base layer 1 and the ultra-tough cement structure 3. The roughness of the uneven surface is 5-10mm, the treatment area is ≥90%, the aggregate is exposed by 1 / 3 and the residual particles are cleaned.

[0189] S3. Install the filling and sealing strip 5 at the expansion joint, with its surface flush with the base layer 1;

[0190] S4. Install the prestressed tendon frame 8, including the inverted Ω-bending stress reinforcement 81, two inverted U-embedded reinforcements 82 and two splice-face transverse anchor bars 83;

[0191] S5. Prepare a high-strength interface agent according to the above scheme and apply it to the roughened uneven surface, controlling the coating amount to be 0.95 kg / m². 2 ;

[0192] S6. Prepare the super-tough cement structure material according to the above plan, pour it evenly, vibrate and level it, and after initial setting, smooth and finish the surface, and spray water mist to moisturize and cure it in time.

[0193] After S7 and 7d, the paving surface layer 4 can be applied.

[0194] Example 2: A super-tough cement seamless splicing structure and its construction method

[0195] A super-tough cement seamless splicing structure and its construction method

[0196] like Figure 1 As shown, from bottom to top, it includes a base layer 1, a road subbase 2, and a pavement surface layer 4; wherein, the road subbase 2 includes a spliced ​​ultra-tough cement structure 3, and the ultra-tough cement structure 3 is connected to the road subbase 2 and the base layer 1 by a rough adhesive surface 6; the splicing interface between the ultra-tough cement structure 3 and the road subbase 2 is provided with a wedge-shaped groove 7, which is used to limit and fix the ultra-tough cement structure 3 and the road subbase 2; a filling sealing strip 5 is also provided at the splicing joint between the base layer 1 and the road subbase 2.

[0197] Among them, the ultra-tough cement structure 3 has a width of 1600mm, the wedge-shaped groove 7 has an inverted trapezoidal cross-section with an upper opening width of 180mm, a lower opening width of 90mm, a depth of 75mm, a length of 800mm, a spacing of 450mm, a step height of 180mm, and a step surface of 320mm; the filling sealing strip 5 is a circle with a diameter of 18mm, the surface of which is flush with the base layer 1, and the material is rubber.

[0198] like Figure 1 As shown, in the ultra-tough cement structure 3, prestressed portal reinforcement is also provided along the length direction. The prestressed portal reinforcement includes an inverted Ω-bending reinforcing bar 81, two inverted U-shaped embedded bars 82, and two splice-face transverse anchor bars 83. The middle protrusion of the inverted U-shaped embedded bar 82 is connected to the concave part of the inverted Ω-bending reinforcing bar 81. The two ends of the inverted Ω-bending reinforcing bar 81 are respectively connected to one end of the two splice-face transverse anchor bars 83. The height of the end of the inverted Ω-bending reinforcing bar 81 is higher than the height of the splice-face transverse anchor bars 83.

[0199] The diameter of the prestressed portal frame reinforcement is 18mm, the height of the inverted Ω-bending reinforcing bar 81 is 220mm, the bottom surface of the prestressed portal frame reinforcement is 120mm from the foundation layer 1, and the prestressing tension of the prestressed portal frame reinforcement is 10MPa.

[0200] In this embodiment, the width of the ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material satisfy the following relationship: ε=1.75f·L -1.64 ,

[0201] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0202] L represents the width of the ultra-tough cement structure 3, in mm;

[0203] f is an adjustment factor, in mm. -1 The value is 1.

[0204] In this embodiment, the elongation of the ultra-tough cement structure material is 0.5.

[0205] According to the formula The calculated ratio of composite fiber to shrinkage-reducing additive is 10.9.

[0206] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0207] p and q are adjustment coefficients, with units of g. -1 ;

[0208] m1 is the amount of composite fiber added, in grams;

[0209] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0210] Therefore, according to the weight parts, the specific components of the ultra-tough cement structural material used in this embodiment are as follows: 65 parts cement, 25 parts quartz sand powder, 12 parts fly ash, 8 parts steel slag powder, 16 parts ultrafine calcium carbonate with a particle size of 200nm, 21.8 parts polyethylene fiber, 2 parts shrinkage-reducing admixture, and 4 parts water; wherein, the shrinkage-reducing admixture is a mixture of magnesium oxide expanding agent and polycarboxylate superplasticizer, and the weight ratio of magnesium oxide expanding agent to polycarboxylate superplasticizer is 2.5.

[0211] In this embodiment, the roughened adhesive surface 6 further includes a roughened uneven surface and a high-strength interface layer coated on the roughened uneven surface. The roughness of the roughened uneven surface is 6 mm, and the aggregate exposure rate accounts for 33% of the maximum particle size. The roughness of the roughened uneven surface and the coating amount of the high-strength interface agent in the high-strength interface layer satisfy the following relationship:

[0212] k·Ah a +c·Bw b =1;

[0213] Where A is the ratio of the interfacial interlocking force to the interfacial connection resultant force, and the unit is 1;

[0214] h is roughness, which reflects the height difference between the unevenness of the interface, and the unit is mm;

[0215] w represents the coating amount of the high-strength interface agent, measured in kg / m². 2 ;

[0216] B is the ratio of chemical bonding force to the resultant force of interfacial bonding, and the unit is 1;

[0217] a and b are exponential constants, with a unit of 1;

[0218] k is an adjustment factor, in mm. -1 ;

[0219] c is the adjustment factor, with a unit of 1 × 10⁻⁶. 6 mm 2 / kg.

[0220] The coating weight of the high-strength interface agent is 1.1 kg / m². 2 .

[0221] The high-strength interface agent comprises the following components by weight: 62 parts of polyhydroxy epoxy resin, 14 parts of isocyanate polyurethane, 8 parts of unsaturated polyester, and 25 parts of amide-amine curing agent. The unsaturated polyester is produced by polycondensation of maleic anhydride, maleic acid, phthalic anhydride, and styrene crosslinking agent in a mass ratio of 2:3:4:1, with the polycondensation reaction temperature controlled at 205℃. The acidity of the unsaturated polyester is 45 mg KOH / g. The amide curing agent is obtained by polycondensation of diglycidyl ester and diethylenetriamine, with an amine value of 380 mg KOH / g.

[0222] This embodiment also provides a construction method for an ultra-tough cement seamless splicing structure, specifically, the method involves prefabrication and on-site assembly of the ultra-tough cement seamless splicing structure, including:

[0223] S1. Based on actual site requirements, select and assemble modular combinations. Precast ultra-tough cement structure modules are 2m in length, with a stepped cross-section that is wider at the top and narrower at the bottom, and both sides protrude downwards to form wedge-shaped clips. Figure 3 As shown, the top and bottom widths are 2cm smaller than the width at the splicing point;

[0224] S2. Install prestressed tendon frame, including bending reinforcing bars and gantry embedded bars. The bar diameter is 18mm. The bending reinforcing bars are inverted Ω-shaped with a height of 200mm and a bottom distance of 100mm from the foundation layer. Set the prestressing tension to 10MPa. Produce ultra-tough cement structure through factory prefabrication and leave corresponding U-shaped bar holes and transverse anchoring bar holes.

[0225] S3. Wedge-shaped grooves are reserved at the on-site splicing points; internal debris is removed, such as... Figure 4 As shown, the step height is 180mm, the step surface width is 300mm, the upper opening width of the slot is 150mm, the lower opening width is 80mm, the depth is 60mm, the length is 800mm, and the spacing is 500mm.

[0226] S4. After the precast ultra-tough cement structure component has reached 80% of its design strength, according to the fixed position of the reserved wedge-shaped groove 7, high-strength interface agent and ultra-tough cement structure material are injected successively along the inverted U-shaped reinforcement hole 31 and the transverse anchoring reinforcement hole 32.

[0227] Comparative Example 1: A seamless splicing structure and its construction method

[0228] The ultra-tough cement seamless splicing structure in this comparative example is the same as that in Example 1, and the construction method of the seamless splicing structure is also the same as that in Example 1. The difference is:

[0229] In this comparative example, the relationship between the width of the non-ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material is: ε=1.75f·L -1.64 To calculate the elongation of ultra-tough cement structural materials, we directly use 0.3% as the elongation rate. Then, according to the following formula: The calculated ratio of composite fiber to shrinkage-reducing additive is 18.2.

[0230] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0231] p and q are adjustment coefficients, with units of g. -1 The value is 1.

[0232] m1 is the amount of composite fiber added, in grams;

[0233] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0234] Therefore, the specific components of the ultra-tough cement structural material used in this comparative example are as follows: 65 parts cement, 28 parts quartz sand powder, 10 parts fly ash, 10 parts steel slag powder, 13 parts ultrafine calcium carbonate with a particle size of 200nm, 31.85 parts polyethylene fiber, 1.75 parts shrinkage reducing admixture, and 4 parts water. The weight ratio of magnesium oxide expanding agent to polycarboxylate superplasticizer is 3.

[0235] The formulations of other components in this comparative example are the same as those in Example 1.

[0236] Comparative Example 2: A seamless splicing structure and its construction method

[0237] The ultra-tough cement seamless splicing structure in this comparative example is the same as that in Example 1, and the construction method of the seamless splicing structure is also the same as that in Example 1. The difference is:

[0238] In this comparative example, the relationship between the width of the non-ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material is: ε=1.75f·L -1.64 To calculate the elongation of ultra-tough cement structural materials, we directly use 3% as the elongation rate. Then, according to the formula: The calculated ratio of composite fiber to shrinkage-reducing additive is 4.8.

[0239] Where ε is the elongation of the ultra-tough cement structure material, and the unit is 1;

[0240] p and q are adjustment coefficients, with units of g. -1 ;

[0241] m1 is the amount of composite fiber added, in grams;

[0242] m2 is the amount of shrinkage-reducing admixture added, in grams.

[0243] Therefore, the specific components of the ultra-tough cement structural material used in this comparative example are as follows: 65 parts cement, 28 parts quartz sand powder, 10 parts fly ash, 10 parts steel slag powder, 13 parts ultrafine calcium carbonate with a particle size of 200nm, 16 parts polyethylene fiber, 4.8 parts shrinkage reducing admixture, and 3-5 parts water. The weight ratio of magnesium oxide expanding agent to polycarboxylate superplasticizer is 3.

[0244] The formulations of other components in this comparative example are the same as those in Example 1.

[0245] Comparative Example 3: A seamless splicing structure and its construction method

[0246] The seamless cement splicing structure in this comparative example is the same as that in Example 1, and the construction method for the seamless splicing structure is also the same as that in Example 1. The difference is that:

[0247] In this comparative example, the roughness of the roughened surface is selected as 20 mm, so the aggregate exposure rate accounts for 40% of the maximum particle size. Therefore, the relationship k·Ah is not used. a +c·Bw b =1 Adjust the coating amount of the high-strength interface agent.

[0248] The formulations of other components in this comparative example are the same as those in Example 1.

[0249] Comparative Example 4: A seamless splicing structure and its construction method

[0250] The seamless cement splicing structure in this comparative example is the same as that in Example 1, and the construction method for the seamless splicing structure is also the same as that in Example 1. The difference is that:

[0251] In this comparative example, the roughness of the roughened surface is selected as 3mm, so the aggregate exposure rate accounts for 15% of the maximum particle size. The relationship k·Ah is not used. a +c·Bw b =1 Adjust the coating amount of the high-strength interface agent.

[0252] The formulations of other components in this comparative example are the same as those in Example 1.

[0253] Performance testing

[0254] The durability and other properties of the seamless splicing structures in Examples 1-2 and Comparative Examples 1-4 were tested. The test method was as follows: by fixing both sides of the ultra-tough cement seamless splicing structure, with a loading rate of 0.05 mm / s and a displacement of 40 mm, the tensile strength and fatigue performance were tested for 5000 cycles. The test results are shown in the table below.

[0255] Table 1. Performance Test Results

[0256]

[0257] According to the comparison of the test results of Comparative Examples 1 and 2 with Example 1, it can be seen that when the relationship provided by the present invention is not used, and the elongation of the ultra-tough cement structure material is limited by the width of the ultra-tough cement structure, the resulting seamless splicing structure exhibits phenomena such as slippage and cracking.

[0258] According to the comparison of the test results of Comparative Example 3 and Example 1, it can be seen that without adjusting the coating amount of the high-strength interface agent using the relational formula provided by the present invention, increasing the roughness of the roughened surface and thus increasing the aggregate exposure rate will result in less than 50% of the aggregate being covered by cement, causing insufficient embedding force and resulting in loosening of the aggregate.

[0259] According to the comparison of the test results of Comparative Example 4 and Example 1, it can be seen that without using the relationship provided by the present invention to adjust the coating amount of the high-strength interface agent, the roughness of the roughened uneven surface is too small, resulting in incomplete removal of the laitance and insufficient biting force formed by the unevenness.

[0260] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been shown above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A super-tough cement seamless splicing structure, characterized in that, From bottom to top, it includes a base layer, a road subbase layer, and a pavement surface layer; wherein, the road subbase layer includes a spliced ​​ultra-tough cement structure, and the ultra-tough cement structure is connected to the road subbase layer and the base layer by a rough adhesive surface; the width of the ultra-tough cement structure and the elongation of the ultra-tough cement structure material satisfy the following relationship: ， in, Elongation of ultra-tough cement structural materials, in units of 1; L The width of the ultra-tough cement structure is in mm. f The adjustment factor is in mm. -1 ; According to the weight percentages, the ultra-tough cement structural material comprises the following components: 65-70 parts dry mix, 10-18 parts nano-active powder, 14-22 parts composite fiber, 1-2 parts shrinkage-reducing admixture, and 3-5 parts water; The amounts of the composite fiber and the shrinkage-reducing additive satisfy the following relationship: ; in, Elongation of ultra-tough cement structural materials, in units of 1; p and q It is an adjustment factor, and the unit is g. -1 ; m 1 This refers to the amount of composite fiber added, expressed in grams. m 2 It refers to the amount of additives used to reduce shrinkage, and the unit is g.

2. The ultra-tough cement seamless splicing structure according to claim 1, characterized in that, The splicing interface between the ultra-tough cement structure and the road subbase is provided with a wedge-shaped groove for limiting and fixing the ultra-tough cement structure and the road subbase.

3. The ultra-tough cement seamless splicing structure according to claim 1, characterized in that, A sealing strip is installed at the expansion joint between the base layer and the road subbase.

4. A seamless cement splicing structure according to any one of claims 1 to 3, characterized in that, In the ultra-tough cement structure, prestressed portal frame reinforcement is provided along the length direction of the ultra-tough cement structure; The prestressed gantry reinforcement includes an inverted Ω-shaped bent reinforcing bar, at least one inverted U-shaped embedded bar, and at least one transverse anchor bar at the splice surface; The middle protrusion of the inverted U-shaped pre-embedded bar is connected to the concave part of the inverted Ω-shaped bent reinforcing bar. The end of the inverted Ω-shaped bent reinforcing bar overlaps with one end of the transverse anchor bar of the splicing surface. The height of the end of the inverted Ω-shaped bent reinforcing bar is higher than the height of the transverse anchor bar of the splicing surface.

5. The ultra-tough cement seamless splicing structure according to claim 1, characterized in that, The roughened adhesive surface includes a roughened concave-convex surface and a high-strength interface layer coated on the roughened concave-convex surface, wherein the roughened concave-convex surface is formed by milling the original road surface.

6. The ultra-tough cement seamless splicing structure according to claim 5, characterized in that, The roughness of the roughened surface and the amount of high-strength interface agent applied in the high-strength interface layer satisfy the following relationship: ； in, A It is the ratio of the interfacial interlocking force to the total interfacial connection force, and the unit is 1; h It is surface roughness, which reflects the height difference between the unevenness of the interface, and the unit is mm; w This refers to the coating amount of the high-strength interface agent, measured in kg / m². 2 ; B It is the ratio of chemical bonding force to the resultant force of interfacial bonding, with the unit being 1; a and b It is an exponential constant, with a unit of 1; k The adjustment factor is in mm. -1 ; c This is an adjustment factor, the unit is 1×10. 6 mm 2 / kg.

7. The ultra-tough cement seamless splicing structure according to claim 6, characterized in that, The high-strength interface agent, calculated by weight, is a condensation product prepared from the following components: 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester, and 16-28 parts of amide-amine curing agent; the coating amount of the high-strength interface agent is 0.8-1.2 kg / m². 2 .

8. The construction method of the ultra-tough cement seamless splicing structure according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Remove the construction site of the ultra-tough cement structure and the excess road sub-layer on the foundation layer, and set wedge-shaped grooves; S2. Roughened uneven surfaces are set at the construction locations of the ultra-tough cement structure of the road subbase and foundation layer. S3. Install a filling and sealing strip at the expansion joint location; S4. Install prestressed portal frame at the construction location of the ultra-tough cement structure; S5. Apply a high-strength interface agent to the roughened surface of the uneven surface. S6. Prepare the ultra-tough cement structure material, pour the ultra-tough cement structure material into the construction position of the ultra-tough cement structure, and vibrate and level it. S7. After the ultra-tough cement structural material has initially set, smooth and finish the surface, and lay the paving surface layer after curing.

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