C35 basalt fiber concrete for abutment and preparation method thereof

Abstract

The present application relates to the field of civil engineering materials, and specifically discloses a C35 basalt fiber concrete for abutments and a preparation method thereof. The C35 basalt fiber concrete for abutments comprises the following raw materials: 350-370 parts of cement, 170-185 parts of water, 570-620 parts of sand, 1140-1250 parts of crushed stone, 55-70 parts of fly ash, 40-55 parts of silica fume, 2-3.8 parts of water reducer, 8-12 parts of basalt fiber composite, 6-8 parts of waterproofing agent, and 3-6 parts of seismic microparticles; the basalt fiber composite is prepared from basalt fiber, mullite fiber, and polycaprolactone melt; the preparation method comprises: mixing cement, sand, crushed stone, fly ash, silica fume, and part of water, adding basalt fiber composite, seismic microparticles, and waterproofing agent, mixing, adding water reducer and remaining water, mixing, pouring, and curing to obtain concrete; the concrete has the advantages of good seismic resistance and high mechanical strength.

Description

Technical Field

[0001] The present application relates to the field of civil engineering materials, and more specifically, to a C35 basalt fiber concrete for abutments and a preparation method thereof. Background Art

[0002] Abutments are structures located at both ends of a bridge that support the bridge's superstructure and connect to the embankment. The concrete materials commonly used in bridge construction need to have a certain bearing capacity. In recent years, adding different types of fiber materials to concrete has become one of the effective ways to improve the mechanical properties of concrete. Among them, basalt fiber has attracted widespread attention due to its excellent mechanical properties, corrosion resistance and environmental protection.

[0003] In the prior art, the Chinese invention patent document with publication number CN112159168A discloses a C35 basalt fiber concrete for abutments and a preparation method thereof, which comprises, by weight, 430-450 parts of cementitious material, 4 parts of basalt fiber, 1790-1800 parts of aggregate, 7-8 parts of water reducer, and 150-170 parts of water; wherein the cementitious material is composed of 280-300 parts of cement, 60-70 parts of fly ash, and 70-90 parts of slag powder.

[0004] Adding basalt fiber to existing concrete is prone to uneven fiber distribution problems, and basalt fiber in concrete relies solely on the viscosity of cement to adhere to the interior of the concrete, so basalt fiber in concrete is prone to low interfacial bonding strength problems. In the event of an earthquake, the basalt fiber on the abutment has limited affinity with the concrete cementitious material. Under the action of seismic waves, the cementitious material and gravel near the basalt fiber are prone to cracking during the vibration process, which can easily cause cracking in the concrete and affect the service life of the abutment.

[0005] Therefore, how to prepare a basalt fiber concrete with good seismic resistance and high mechanical strength for use in building abutments to extend the service life and durability of the abutments is a problem to be solved. Summary of the Invention

[0006] In order to prepare a basalt fiber concrete with good seismic resistance and high mechanical strength for use in building abutments to extend the service life and durability of the abutments, the present application provides a C35 basalt fiber concrete for abutments and a preparation method thereof.

[0007] In the first aspect, the present application provides a C35 basalt fiber concrete for a bridge abutment, adopting the following technical solution: a C35 basalt fiber concrete for a bridge abutment, the concrete comprising the following raw materials in parts by weight: 350-370 parts of cement, 170-185 parts of water, 570-620 parts of sand, 1140-1250 parts of gravel, 55-70 parts of fly ash, 40-55 parts of silica fume, 2-3.8 parts of water reducer, 8-12 parts of basalt fiber composite, 6-8 parts of waterproofing agent, and 3-6 parts of seismic resistant particles; the basalt fiber composite is made of basalt fiber, mullite fiber and polycaprolactone melt in a mass ratio of 1:0.2-0.4:0.2-0.3.

[0008] By adopting the above technical solution, basalt fiber and mullite fiber are bonded by polycaprolactone melt to form an interlaced network bonding structure of basalt fiber and mullite fiber. The polycaprolactone on the surface of the basalt fiber composite is insoluble in water and has a good dispersion effect. During the concrete mixing process, the problem of basalt fiber composite aggregation is not likely to occur, thereby ensuring that the basalt fiber is well distributed in the concrete. At the same time, the melting point of polycaprolactone is around 60°C. During the hydration process of large-volume concrete used in abutments, the hydration temperature can exceed 60°C, causing the polycaprolactone to gradually melt. The hot-melt polycaprolactone can not only improve the bonding effect between the cement binder and the basalt fiber composite, but also the bonding network with a large specific surface area formed by the basalt fiber and mullite fiber can contact the binder, further improving the bonding effect between the basalt fiber composite and the concrete binder, thereby improving the strength and seismic resistance of the concrete.

[0009] By utilizing the higher strength and better tensile effect of basalt fiber, combined with the better flexibility and elasticity of mullite fiber and the flexibility of polycaprolactone, it can resist the pulling and shearing effect of earthquake shear waves on concrete. At the same time, the flexibility and elasticity of mullite fiber combined with the network connection structure of basalt fiber composites, when the earthquake longitudinal wave reaches the surface of the abutment concrete, the earthquake longitudinal wave stretches the concrete, and the flexible network structure formed by polycaprolactone combined with the flexibility of mullite fiber can resist the tensile force and can deform appropriately with the tensile force. When the earthquake longitudinal wave generates compression force, the void compression effect of the network structure combined with the elasticity of mullite fiber can produce a compression effect with the earthquake longitudinal wave, so that the concrete can maintain good stability under the tensile and compressive forces of the earthquake longitudinal wave, so that the concrete is not prone to cracking after being affected by earthquake shear waves and earthquake longitudinal waves, thereby extending the service life of the abutment concrete.

[0010] Preferably, the basalt fiber is prepared by uniformly spraying a rubber solution on basalt fiber yarns after oxygen plasma etching, and then uniformly spraying a sucrose laurate solution on the basalt fiber yarns. The mass ratio of the basalt fiber yarns to the rubber solution and the sucrose laurate solution is 1:0.2-0.35:0.1-0.2.

[0011] By adopting the above technical solution, after the basalt fiber is etched by oxygen plasma, the surface roughness of the basalt increases, the surface porosity increases, and groups such as hydroxyl groups exist on the surface. Then, the rubber solution is bonded. The roughness of the basalt fiber surface can increase the contact area between the basalt fiber and the rubber solution. Combined with the hydroxyl groups on the surface of the basalt fiber and the viscosity of the rubber solution, the bonding effect between the basalt fiber and the rubber solution is further improved. The flexibility and elasticity of the rubber solution are utilized to improve the flexibility and elasticity of the basalt fiber, so that the basalt fiber has higher strength in concrete while having certain flexibility and elasticity. When subjected to seismic wave impact, the basalt fiber acts as the main supporting component to resist the shear and pulling effects of the seismic shear wave on the basalt, while the rubber enables the basalt fiber to resist the compression and stretching effects of the longitudinal wave, ensuring that the basalt fiber has higher stability when impacted by seismic waves.

[0012] The surface of the basalt fiber is loaded with rubber and then bonded with a sucrose laurate solution. The ester group in the sucrose laurate is used to ensure that the basalt fiber has a good dispersion effect during the concrete mixing process, ensuring the uniformity of the dispersion of the basalt fiber in the concrete. The hydroxyl groups in the sucrose laurate are convenient for connecting with the cementitious material formed by cement. Combined with the hydroxyl groups on the surface of the basalt fiber after oxygen etching treatment, the cross-linking and bonding between the basalt fiber and the cementitious material are further promoted, and the gradual connection effect of the mortar and aggregate can be improved. The stable cross-linking connection network in the concrete makes it less likely for the concrete to crack when impacted by seismic waves, thereby ensuring the strength and durability of the concrete.

[0013] Preferably, the rubber solution is prepared from nitrile rubber, dimethylformamide and polyetheretherketone in a mass ratio of 1:100-120:0.2-0.6.

[0014] By adopting the above technical solution, nitrile rubber and polyetheretherketone are dissolved in dimethylformamide, and the amide groups in dimethylformamide can easily connect with the hydroxyl groups on the surface of the basalt fiber, and can also connect with the hydroxyl groups in sucrose laurate, thereby improving the cross-linking stability of the basalt fiber and the rubber, and cooperating with the sucrose laurate on the surface of the basalt fiber to bond with the cementitious material, further improving the bonding stability of the basalt fiber, rubber and cementitious material, and improving the strength of concrete; at the same time, when subjected to earthquake shock waves, the basalt fiber resists shearing by shear waves, and the rubber resists stretching and contraction by longitudinal waves. During the switching process between shear waves and longitudinal waves of the earthquake, the structural stability of the concrete can still be maintained, thereby improving the seismic effect of the concrete and extending the service life of the concrete.

[0015] Preferably, the sucrose laurate solution is prepared from sucrose laurate, ethanol and cetearyl alcohol in a mass ratio of 1:90-110:0.2-0.5.

[0016] By adopting the above technical solution, sucrose laurate and cetearyl alcohol are both soluble in ethanol but insoluble in water. During the concrete hydration process, they are not easy to absorb mixing water, thereby ensuring the hydration effect of cement and the uniformity of dispersion of basalt fiber in concrete.

[0017] During the hydration process, the melting point of cetearyl alcohol is around 50°C, and the hydration temperature of large-volume concrete used in abutments can reach up to around 70°C. After the cetearyl alcohol is hot-melted, the hydroxyl groups in cetearyl alcohol, the hydroxyl groups in sucrose laurate, and the hydroxyl and amide groups on the surface of the basalt fiber are used to further improve the cross-linking and bonding effect between the basalt fiber and the cementitious material, thereby improving the bonding stability between the concrete cementitious material and the aggregate and the basalt fiber composite. When subjected to the impact of seismic waves, it can resist transverse and longitudinal waves, making it less likely for the concrete to crack, thereby extending the service life of the concrete.

[0018] Preferably, the mullite fiber is made by treating polycrystalline mullite fiber with ethyl glycolate and then uniformly spraying TPU liquid and urethane particles. The mass ratio of polycrystalline mullite fiber, TPU liquid and urethane particles is 1:0.2-0.3:0.1-0.2.

[0019] By adopting the above technical solution, the porous structure of the polycrystalline mullite fiber is penetrated by ethyl glycolate, so that the pores on the surface of the mullite fiber are loaded with ethyl glycolate, and then bonded with TPU liquid, and the amino groups in the TPU liquid are attracted to the hydroxyl groups in ethyl glycolate to connect with each other. Ethyl glycolate can also use its flexible chain segments to penetrate into the TPU molecular chain, further improving the flexibility of TPU; under the viscosity of the TPU liquid, the ethyl formate particles are adhered to the surface of the polycrystalline mullite fiber, and the amino and carboxyl groups in the ethyl formate are used to facilitate the bonding with the adhesive. The cross-linking density and bonding stability of the polycrystalline mullite fiber can improve the bonding stability between the polycrystalline mullite fiber and the cementitious material. When subjected to the impact of seismic waves, the polycrystalline mullite fiber can resist the impact of longitudinal waves by utilizing its better flexibility and elasticity. Combined with the better impact effect of TPU, it can further resist the impact of longitudinal waves. The higher cross-linking density and better bonding stability can improve the polycrystalline mullite fiber's ability to resist the shear force of seismic shear waves, ensure that the mullite fiber is not easily separated from the cementitious material, make the concrete less likely to crack during an earthquake, and extend the service life of the concrete.

[0020] Preferably, the TPU liquid is prepared from TPU, polyetheretherketone and dimethylformamide in a mass ratio of 1:0.2-0.5:90-120.

[0021] By adopting the above technical solution, TPU and polyetheretherketone are both dissolved in dimethylformamide, and the hydroxyl group of ethyl glycolate on the surface of polycrystalline mullite fiber is connected with the amide group to improve the bonding effect of TPU on the surface of polycrystalline mullite fiber. The flexibility and elasticity of TPU are combined with the flexibility and strength of polyetheretherketone to improve the effect of polycrystalline mullite fiber in resisting seismic shear waves and longitudinal waves, thereby improving the seismic resistance of concrete and extending the service life of concrete.

[0022] Preferably, the shock-resistant particles are made of silica microspheres, polycarbonate microspheres and acetyl glucosamine solution in a mass ratio of 1:0.5-1:0.4-0.6.

[0023] By adopting the above technical solution, the bonding effect of the acetyl glucosamine solution is utilized to make the acetyl glucosamine adhere to the surface of the silica microspheres and the polycarbonate microparticles, and the amino and carboxyl groups of the acetyl glucosamine are utilized to improve the cross-linking bonding effect between the seismic microparticles and the cementitious materials and the basalt fiber composites, thereby improving the structural density of the concrete and making the concrete have better seismic resistance.

[0024] Preferably, the polycaprolactone melt is prepared from a polycaprolactone melt and urea particles in a mass ratio of 1:0.1-0.2.

[0025] By adopting the above technical solution, urea particles are added to the polycaprolactone melt. During the concrete mixing process, the urea particles are not easy to absorb the mixing water, thereby ensuring the hydration effect of the concrete. During the hydration process, the hydration temperature of the large-volume concrete used in the abutment is high. After the polycaprolactone is hot-melted, the urea particles are gradually released. The urea particles absorb excess mixing water, and the amino groups in the urea can be interconnected with the cementitious material, basalt fiber, and mullite fiber to increase the internal structure density of the concrete, thereby improving the seismic resistance of the concrete. At the same time, polycaprolactone has a certain viscosity and waterproof effect, which can further improve the seismic resistance and waterproofness of the concrete.

[0026] Preferably, the waterproofing agent is composed of silane coupling agent KH-570 and silicone waterproofing agent in a mass ratio of 1:0.5-1.

[0027] By adopting the above technical solution, the waterproof effect of the concrete used for the abutment is improved and the service life of the concrete is extended.

[0028] In a second aspect, the present application provides a method for preparing C35 basalt fiber concrete for abutments, which adopts the following technical solution:

[0029] A method for preparing C35 basalt fiber concrete for abutments comprises the following steps:

[0030] S1. Weigh cement, sand, gravel, fly ash, silica fume, and 1 / 4-1 / 3 of the total amount of water and mix them evenly to obtain a primary mixture;

[0031] S2. Add basalt fiber composite, earthquake-resistant particles, and waterproofing agent to the primary mixture, mix and stir evenly to obtain a mixture;

[0032] S3. Add a water reducer and 2 / 3-3 / 4 of the total water to the mixture, mix and stir evenly to obtain a mixture;

[0033] S4. The mixed materials are poured and cured to obtain finished concrete.

[0034] By adopting the above technical solution, a large volume of concrete for the abutment is obtained, which has higher strength and better earthquake resistance. Even after being impacted by earthquake waves, it is not prone to cracking, thereby extending the service life of the abutment concrete.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. By utilizing the higher strength and better tensile effect of basalt fiber, combined with the better flexibility and elasticity of mullite fiber and the flexibility of polycaprolactone, it can resist the pulling and shearing effect of earthquake shear waves on concrete. At the same time, the flexibility and elasticity of mullite fiber combined with the network connection structure of basalt fiber composites enable concrete to maintain good stability under the tensile and compressive forces of earthquake longitudinal waves, so that concrete is not prone to cracking after being affected by earthquake shear waves and earthquake longitudinal waves, thereby extending the service life of bridge abutment concrete.

[0037] 2. The different lengths and sizes of basalt fibers ensure that the basalt fibers are evenly filled in the concrete. Combined with the size of the seismic-resistant particles and the size of the mullite fibers, the concrete has a higher filling density, which improves the density of the concrete while improving the seismic resistance of the concrete, thereby extending the service life of the concrete.

[0038] 3. The filling of urea particles and the viscosity of polycaprolactone melt facilitate the formation of a connection network of basalt fiber composites. During the mixing process, the urea particles serve as support. In the later stage of hydration, the urea particles gradually dissolve in water, providing expansion space for the hydration of large-volume concrete, and promoting the contact between concrete cementitious materials and basalt fiber composites, thereby increasing the contact area and thus improving the stability of the cross-linked structure and the seismic effect of concrete. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the embodiments.

[0040] Preparation example of basalt fiber

[0041] The following raw materials and equipment are all commercially available.

[0042] Preparation Example 1: Basalt fiber is prepared by the following method:

[0043] 1 kg of nitrile rubber and 0.5 kg of polyetheretherketone were added to 110 kg of dimethylformamide and stirred until completely dissolved to obtain a rubber solution;

[0044] Add 1 kg of sucrose laurate and 0.4 kg of cetearyl alcohol to 100 kg of ethanol and stir until completely dissolved to obtain a sucrose laurate solution;

[0045] 1 kg of basalt fiber was subjected to oxygen plasma etching for 20 minutes to obtain etched basalt fiber, which consisted of basalt fiber with an average length of 10 mm and basalt fiber with an average length of 20 mm at a mass ratio of 1:0.5; 0.3 kg of rubber solution was evenly sprayed on the surface of the etched basalt fiber, and the spraying rate of the rubber solution was 200 g / min. During the spraying process, the etched basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the etched basalt fiber was not adhered to each other and agglomerated, thereby obtaining loaded basalt fiber; 0.15 kg of sucrose laurate solution was evenly sprayed on the surface of the loaded basalt fiber, and the spraying rate of the sucrose laurate solution was 200 g / min. During the spraying process, the loaded basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the loaded basalt fiber was not adhered to each other and agglomerated, thereby obtaining basalt fiber.

[0046] Preparation Example 2: This preparation example differs from Preparation Example 1 in that:

[0047] 1 kg of nitrile rubber and 0.2 kg of polyetheretherketone were added to 100 kg of dimethylformamide and stirred until completely dissolved to obtain a rubber solution;

[0048] 1 kg of sucrose laurate and 0.2 kg of cetearyl alcohol were added to 90 kg of ethanol and stirred until completely dissolved to obtain a sucrose laurate solution;

[0049] 1 kg of basalt fiber yarn was subjected to oxygen plasma etching for 20 minutes to obtain etched basalt fiber, which was composed of basalt fiber yarns with an average length of 10 mm and basalt fiber yarns with an average length of 20 mm at a mass ratio of 1:0.5; 0.2 kg of rubber solution was evenly sprayed on the surface of the etched basalt fiber, and the spraying rate of the rubber solution was 200 g / min. During the spraying process, the etched basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the etched basalt fiber was not adhered to each other and agglomerated, thereby obtaining loaded basalt fiber; 0.1 kg of sucrose laurate solution was evenly sprayed on the surface of the loaded basalt fiber, and the spraying rate of the sucrose laurate solution was 200 g / min. During the spraying process, the loaded basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the loaded basalt fiber was not adhered to each other and agglomerated, thereby obtaining basalt fiber.

[0050] Preparation Example 3: This preparation example differs from Preparation Example 1 in that:

[0051] 1 kg of nitrile rubber and 0.6 kg of polyetheretherketone were added to 110 kg of dimethylformamide and stirred until completely dissolved to obtain a rubber solution;

[0052] Add 1 kg of sucrose laurate and 0.5 kg of cetearyl alcohol to 100 kg of ethanol and stir until completely dissolved to obtain a sucrose laurate solution;

[0053] 1 kg of basalt fiber was subjected to oxygen plasma etching for 20 minutes to obtain etched basalt fiber, which consisted of basalt fiber with an average length of 10 mm and basalt fiber with an average length of 20 mm at a mass ratio of 1:0.5; 0.35 kg of rubber solution was evenly sprayed on the surface of the etched basalt fiber, and the spraying rate of the rubber solution was 200 g / min. During the spraying process, the etched basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the etched basalt fiber was not adhered to each other and agglomerated, thereby obtaining loaded basalt fiber; 0.2 kg of sucrose laurate solution was evenly sprayed on the surface of the loaded basalt fiber, and the spraying rate of the sucrose laurate solution was 200 g / min. During the spraying process, the loaded basalt fiber was continuously stirred at a speed of 250 r / min. After drying and dispersion, the loaded basalt fiber was not adhered to each other and agglomerated, thereby obtaining basalt fiber.

[0054] Preparation example of mullite fiber

[0055] The following raw materials and equipment are all commercially available.

[0056] Preparation Example 4: Mullite fiber is prepared by the following method:

[0057] 1 kg of TPU and 0.4 kg of polyetheretherketone were added to 100 kg of dimethylformamide and stirred until completely dissolved to obtain a TPU liquid; 1 kg of polycrystalline mullite fiber was placed in 10 kg of ethyl glycolate, the polycrystalline mullite fiber consisting of fiber filaments with an average length of 3 mm and fiber filaments with an average length of 5 mm in a mass ratio of 1:0.5, ultrasonically dispersed at 20 kHz for 30 minutes, filtered to separate the polycrystalline mullite fiber, and then evenly sprayed with 0.25 kg of TPU liquid on the surface, and then added with 0.15 kg of ethyl formate particles at an average addition rate of 200 g / min. During the addition process, the polycrystalline mullite fiber was continuously stirred at a speed of 250 r / min, and dried and dispersed until the polycrystalline mullite fiber filaments did not stick to each other and agglomerated to obtain a finished mullite fiber.

[0058] Preparation Example 5: This preparation example differs from Preparation Example 4 in that:

[0059] 1 kg of TPU and 0.2 kg of polyetheretherketone were added to 90 kg of dimethylformamide and stirred until completely dissolved to obtain TPU liquid; 1 kg of polycrystalline mullite fiber was placed in 10 kg of ethyl glycolate, and the polycrystalline mullite fiber consisted of fiber with an average length of 3 mm and fiber with an average length of 5 mm in a mass ratio of 1:0.5. The fiber was ultrasonically dispersed at 20 kHz for 30 minutes, and the polycrystalline mullite fiber was filtered and separated. Then, 0.2 kg of TPU liquid was evenly sprayed on the surface, and 0.1 kg of ethyl formate particles were added. The average addition rate of the ethyl formate particles was 200 g / min. During the addition process, the polycrystalline mullite fiber was continuously stirred at a speed of 250 r / min, and was dried and dispersed until the polycrystalline mullite fiber did not stick to each other and agglomerated to obtain a finished mullite fiber.

[0060] Preparation Example 6: This preparation example differs from Preparation Example 4 in that:

[0061] 1 kg of TPU and 0.5 kg of polyetheretherketone were added to 120 kg of dimethylformamide and stirred until completely dissolved to obtain TPU liquid; 1 kg of polycrystalline mullite fiber was placed in 10 kg of ethyl glycolate, and the polycrystalline mullite fiber consisted of fiber with an average length of 3 mm and fiber with an average length of 5 mm in a mass ratio of 1:0.5. Ultrasonic dispersion was performed at 20 kHz for 30 minutes, and the polycrystalline mullite fiber was separated by filtration. Then, 0.3 kg of TPU liquid was evenly sprayed on the surface, and 0.2 kg of ethyl formate particles were added. The average addition rate of the ethyl formate particles was 200 g / min. During the addition process, the polycrystalline mullite fiber was continuously stirred at a speed of 250 r / min, and was dried and dispersed until the polycrystalline mullite fiber did not stick to each other and agglomerated to obtain a finished mullite fiber.

[0062] Preparation example of basalt fiber composite

[0063] The following raw materials and equipment are all commercially available.

[0064] Preparation Example 7: Basalt fiber composite material was prepared by the following method:

[0065] 1 kg of polycaprolactone was heated to 60 degrees Celsius to completely melt to obtain a polycaprolactone melt, and 0.1 kg of urea particles were added to the polycaprolactone melt. The average particle size of the urea particles was 60 μm, and the addition rate of the urea particles was 200 g / min. During the addition process, the polycaprolactone melt was continuously stirred at a speed of 250 r / min. After mixing and stirring, a polycaprolactone melt was obtained;

[0066] 0.25 kg of polycaprolactone melt was evenly sprayed on the surface of 1 kg of basalt fiber prepared in Preparation Example 1, and then 0.3 kg of mullite fiber prepared in Preparation Example 4 was added. The addition rate of the mullite fiber was 200 g / min. During the addition process, the basalt fiber was continuously stirred at a speed of 250 r / min. After mixing and stirring evenly, it was dried and broken up to obtain a basalt fiber composite. The average particle size of the basalt fiber composite was 20-30 mm.

[0067] Preparation Example 8: This preparation example differs from Preparation Example 7 in that:

[0068] 1 kg of polycaprolactone was heated until completely melted to obtain a polycaprolactone melt, and 0.1 kg of urea particles were added at a rate of 200 g / min. During the addition process, the polycaprolactone melt was continuously stirred at a rate of 250 r / min. After mixing and stirring, a polycaprolactone melt was obtained;

[0069] 0.2 kg of polycaprolactone melt was evenly sprayed on the surface of 1 kg of basalt fiber prepared in Preparation Example 2, and then 0.2 kg of mullite fiber prepared in Preparation Example 5 was added. The addition rate of the mullite fiber was 200 g / min. During the addition process, the basalt fiber was continuously stirred at a speed of 250 r / min. After mixing and stirring evenly, it was dried and broken up to obtain a basalt fiber composite. The average particle size of the basalt fiber composite was 20-30 mm.

[0070] Preparation Example 9: This preparation example differs from Preparation Example 7 in that:

[0071] 1 kg of polycaprolactone was heated until completely melted to obtain a polycaprolactone melt, and then 0.2 kg of urea particles were added at a rate of 200 g / min. During the addition process, the polycaprolactone melt was continuously stirred at a rate of 250 r / min. After mixing and stirring, a polycaprolactone melt was obtained;

[0072] 0.3 kg of polycaprolactone melt was evenly sprayed on the surface of 1 kg of basalt fiber prepared in Preparation Example 3, and then 0.4 kg of mullite fiber prepared in Preparation Example 6 was added. The addition rate of the mullite fiber was 200 g / min. During the addition process, the basalt fiber was continuously stirred at a speed of 250 r / min. After mixing and stirring evenly, it was dried and broken up to obtain a basalt fiber composite. The average particle size of the basalt fiber composite was 20-30 mm.

[0073] Preparation example of shock-resistant microparticles

[0074] The following raw materials and equipment are all commercially available.

[0075] Preparation Example 10: Shock-resistant particles were prepared by the following method:

[0076] 1 kg of silica microspheres and 1 kg of polycarbonate microspheres were weighed and mixed evenly to obtain mixed microspheres, wherein the average particle size of the silica microspheres was 20 μm and the average particle size of the polycarbonate microspheres was 80 μm. 0.5 kg of acetyl glucosamine solution was evenly sprayed on the surface, wherein the acetyl glucosamine solution was an acetyl glucosamine aqueous solution with a mass fraction of 2%. The microspheres were dried and dispersed until they did not stick to each other and agglomerated to obtain finished seismic-resistant particles.

[0077] Preparation Example 11: This preparation example differs from Preparation Example 10 in that:

[0078] 1 kg of silica microspheres and 0.5 kg of polycarbonate microspheres were weighed and mixed evenly to obtain mixed microspheres. 0.4 kg of acetyl glucosamine solution was evenly sprayed on the surface, where the acetyl glucosamine solution was an acetyl glucosamine aqueous solution with a mass fraction of 2%. The microspheres were dried and dispersed until they did not stick to each other and agglomerated to obtain finished anti-seismic particles.

[0079] Preparation Example 12: This preparation example differs from Preparation Example 10 in that:

[0080] 1 kg of silica microspheres and 1 kg of polycarbonate microspheres were weighed and mixed evenly to obtain mixed microspheres. 0.6 kg of acetyl glucosamine solution was evenly sprayed on the surface. The acetyl glucosamine solution was an acetyl glucosamine aqueous solution with a mass fraction of 2%. The microspheres were dried and dispersed until they did not stick to each other and agglomerated to obtain finished anti-seismic particles.

[0081] Example

[0082] The following raw materials are all commercially available.

[0083] Example 1: C35 basalt fiber concrete for abutments:

[0084] 360kg cement, 180kg water, 600kg sand, 1200kg crushed stone, 62kg fly ash, 48kg silica fume, 3kg water reducer, 10kg basalt fiber composite, 7kg waterproofing agent, 4.5kg seismic microparticles; the water reducer is a polycarboxylic acid high-efficiency water reducer; the basalt fiber composite is the basalt fiber composite prepared in Preparation Example 7; the seismic microparticles are the seismic microparticles prepared in Preparation Example 10; the waterproofing agent is composed of a silane coupling agent KH-570 and an organosilicon waterproofing agent in a mass ratio of 1:1; the cement is ordinary Portland cement with a PO42.5 content; the crushed stone has a particle size of 5-25mm with continuous grading and a mud content of <1%; the sand is medium sand in Zone II with an apparent density of 2660kg / m 3, fineness modulus is 2.5, mud content is less than 1.0%; fly ash is F Class II fly ash, fly ash fineness (45μm square hole sieve residue) is 8%, loss on ignition is less than 4.5%, water requirement ratio is less than 96%, moisture content is less than 0.2%; silica fume is SF93, silica content in silica fume is ≥86%, average particle size is 0.1-0.2μm, moisture content is less than 3%, loss on ignition is less than 5%, pozzolanic activity index is greater than 92%, specific surface area is ≥15000m 2 / kg;

[0085] The preparation method is as follows:

[0086] S1. Weigh cement, sand, gravel, fly ash, mineral powder, and 1 / 3 of the total amount of water and mix them evenly to obtain a primary mixture;

[0087] S2. Add basalt fiber composite, earthquake-resistant particles, and waterproofing agent to the primary mixture, mix and stir evenly to obtain a mixture;

[0088] S3. Add a water reducer and 2 / 3 of the total water to the mixture, mix and stir evenly to obtain a mixture;

[0089] S4. The mixed materials are poured and cured to obtain finished concrete.

[0090] Example 2: This example differs from Example 1 in that:

[0091] 350kg of cement, 170kg of water, 570kg of sand, 1140kg of crushed stone, 55kg of fly ash, 40kg of silica fume, 2kg of water reducer, 8kg of basalt fiber composite, 6kg of waterproofing agent, and 3kg of earthquake-resistant particles; the basalt fiber composite is the basalt fiber composite prepared in Preparation Example 8; the earthquake-resistant particles are the earthquake-resistant particles prepared in Preparation Example 11; the waterproofing agent is composed of a silane coupling agent KH-570 and an organosilicon waterproofing agent in a mass ratio of 1:0.5;

[0092] The preparation method is as follows:

[0093] S1. Weigh cement, sand, gravel, fly ash, mineral powder, and 1 / 4 of the total amount of water and mix them evenly to obtain a primary mixture;

[0094] S2. Add basalt fiber composite, earthquake-resistant particles, and waterproofing agent to the primary mixture, mix and stir evenly to obtain a mixture;

[0095] S3. Add a water reducer and 3 / 4 of the total water to the mixture, mix and stir evenly to obtain a mixture;

[0096] S4. The mixed materials are poured and cured to obtain finished concrete.

[0097] Example 3: This example differs from Example 1 in that:

[0098] 370kg of cement, 185kg of water, 620kg of sand, 1250kg of gravel, 70kg of fly ash, 55kg of silica fume, 3.8kg of water reducer, 12kg of basalt fiber composite, 8kg of waterproofing agent, and 6kg of seismic particles; the seismic particles are the seismic particles prepared in Preparation Example 12; the basalt fiber composite is the basalt fiber composite prepared in Preparation Example 9; the waterproofing agent is composed of a silane coupling agent KH-570 and a silicone waterproofing agent in a mass ratio of 1:1.

[0099] Example 4: This example differs from Example 1 in that:

[0100] The basalt fibers were not treated with oxygen plasma etching during their preparation.

[0101] Example 5: This example differs from Example 1 in that:

[0102] No rubber solution was added during the preparation of basalt fiber.

[0103] Example 6: This example differs from Example 1 in that:

[0104] No sucrose laurate solution was added during the preparation of basalt fibers.

[0105] Example 7: This example differs from Example 1 in that:

[0106] The mullite fibers were not treated with ethyl glycolate during preparation.

[0107] Example 8: This example differs from Example 1 in that:

[0108] No TPU liquid was added during the preparation of mullite fibers.

[0109] Example 9: This example differs from Example 1 in that:

[0110] No urethane particles were added during the preparation of the mullite fibers.

[0111] Example 10: This example differs from Example 1 in that:

[0112] No acetyl glucosamine solution was added during the preparation of the shock-resistant microparticles.

[0113] Example 11: This example differs from Example 1 in that:

[0114] No urea particles were added to the polycaprolactone melt.

[0115] Comparative Example

[0116] Comparative Example 1: The difference between this comparative example and Example 1 is that:

[0117] The basalt fiber composite was replaced by commercially available basalt fiber of equal quality in the raw materials.

[0118] Comparative Example 2: This comparative example differs from Example 1 in that:

[0119] No mullite fiber and polycaprolactone melt were added in the preparation process of the basalt fiber composite material.

[0120] Performance testing

[0121] 1. Strength detection

[0122] The methods of Examples 1-11 and Comparative Examples 1-2 were used to prepare concrete, and 1 m 3 For test blocks, refer to GB / T50081-2016 to test the strength after 28 days of curing and record the data.

[0123] 2. Earthquake resistance testing

[0124] The methods of Examples 1-11 and Comparative Examples 1-2 were used to prepare concrete, and 1 m 3 For the test block, calculate the total cracking area per unit area 48 hours after pouring; subject the test block to an earthquake simulation vibration table to simulate the transverse and longitudinal waves generated by the earthquake. After 30 minutes of treatment, continue to calculate the total cracking area per unit area and record the area difference = post-earthquake cracking area - pre-earthquake cracking area, and record the data.

[0125] Table 1 Performance test table

[0126] project Compressive strength / MPa <![CDATA[Area difference / mm 2 / m 2 > Example 1 37.8 45.6 Example 2 37.5 47.2 Example 3 38.0 44.8 Example 4 37.2 50.5 Example 5 36.3 65.4 Example 6 36.6 61.3 Example 7 37.3 48.7 Example 8 36.5 63.9 Example 9 37.0 55.2 Example 10 36.0 75.5 Example 11 36.7 58.4 Comparative Example 1 34.0 125.6 Comparative Example 2 35.2 92.3

[0127] From Examples 1-3 and Table 1, it can be seen that the concrete prepared in the present application has high strength, and after simulated earthquake treatment, the crack area increase is small, indicating that the concrete has good earthquake resistance.

[0128] Combining Example 1 and Examples 4-11 and Table 1, it can be seen that the basalt fiber of Example 4 was not subjected to oxygen plasma etching during the preparation process. Compared with Example 1, the compressive strength of the concrete of Example 4 is less than that of Example 1, and the difference in the area of ​​the cracks is greater than that of Example 1. This shows that after the basalt fiber is treated with oxygen plasma etching, the surface roughness of the fiber can be increased, thereby facilitating the adhesion of rubber and sucrose laurate, improving the cross-linking effect of the basalt fiber and the cementitious material, and thus improving the strength and seismic resistance of the concrete.

[0129] No rubber solution was added during the preparation of the basalt fiber in Example 5. Compared with Example 1, the compressive strength of the concrete in Example 5 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that the addition of rubber can improve the flexibility of the basalt fiber, thereby facilitating resistance to the transverse and longitudinal waves of earthquakes and making the abutment have better seismic resistance.

[0130] No sucrose laurate solution was added during the preparation of basalt fiber in Example 6. Compared with Example 1, the compressive strength of the concrete in Example 6 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that the addition of sucrose laurate solution can cross-link with the cementitious material, increase the density of the internal structure of the concrete, and thus improve the strength and seismic resistance of the concrete.

[0131] During the preparation of the mullite fiber in Example 7, ethyl glycolate was not treated. Compared with Example 1, the compressive strength of the concrete in Example 7 was lower than that in Example 1, and the difference in the area of ​​the cracks was greater than that in Example 1, indicating that ethyl glycolate can improve the flexibility of TPU, further improve the concrete's resistance to earthquakes and buffering effect, and promote the cross-linking of mullite fibers with cementitious materials and basalt fibers, thereby improving the density of the concrete and making the concrete have higher strength and better seismic resistance.

[0132] No TPU liquid was added during the preparation of mullite fiber in Example 8. Compared with Example 1, the compressive strength of the concrete in Example 8 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that the addition of TPU can improve the flexibility and buffering effect of mullite fiber, thereby improving the seismic resistance and strength of concrete.

[0133] No urethane particles were added during the preparation of mullite fibers in Example 9. Compared with Example 1, the compressive strength of the concrete in Example 9 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that ethyl aminocaproate particles can promote the cross-linking and bonding of mullite fibers and cementitious materials, thereby improving the seismic resistance and strength of concrete.

[0134] No acetyl glucosamine solution was added during the preparation of the seismic-resistant particles in Example 10. Compared with Example 1, the compressive strength of the concrete in Example 10 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that acetyl glucosamine can improve the cross-linking effect of the seismic-resistant particles with the cementitious material and the basalt fiber composite, and cooperate with the impact resistance, high toughness, and good filling effect of the seismic-resistant particles to further improve the structural density of the concrete, thereby improving the strength and seismic resistance of the concrete.

[0135] In Example 11, no urea particles were added to the polycaprolactone melt. Compared with Example 1, the compressive strength of the concrete in Example 1 was lower than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that the urea particles were not easy to absorb mixing water during the mixing stage, thus ensuring the hydration effect of the concrete. During the hydration process, the basalt fiber composite material could be bonded to the cementitious material, and space could be provided for the pressure of seismic waves. The basalt fiber composite material could resist the shear and tensile strength of seismic waves, thereby improving the seismic resistance of the concrete.

[0136] Combining Example 1 and Comparative Examples 1-2 and Table 1, it can be seen that the basalt fiber composite material in Comparative Example 1 is replaced by commercially available basalt fiber of equal quality. Compared with Example 1, the compressive strength of the concrete in Comparative Example 1 is lower than that in Example 1, and the difference in the area of ​​cracks is greater than that in Example 1, indicating that ordinary basalt fiber only has a filling effect and is filled in the concrete by relying on the viscosity of the cementitious material. During an earthquake, it is easy to cause cracks inside the concrete, affecting the strength of the concrete and thus affecting the service life of the abutment.

[0137] In the preparation process of the basalt fiber composite material in the raw materials of Comparative Example 2, no mullite fiber and polycaprolactone melt were added. Compared with Example 1, the compressive strength of the concrete in Comparative Example 2 was less than that in Example 1, and the difference in the area of ​​cracks was greater than that in Example 1, indicating that the combination of mullite fiber and polycaprolactone melt can resist the longitudinal waves of earthquakes, and cooperate with basalt fiber to resist the shear waves of earthquakes, thereby improving the seismic effect of concrete and extending the service life of abutment concrete.

[0138] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A C35 basalt fiber concrete for abutments, characterized in that: The concrete comprises the following raw materials in parts by weight: 350-370 parts of cement, 170-185 parts of water, 570-620 parts of sand, 1140-1250 parts of crushed stone, 55-70 parts of fly ash, 40-55 parts of silica fume, 2-3.8 parts of water reducer, 8-12 parts of basalt fiber composite, 6-8 parts of waterproofing agent, and 3-6 parts of earthquake-resistant particles; the basalt fiber composite is made of basalt fiber, mullite fiber and polycaprolactone melt in a mass ratio of 1:0.2-0.4:0.2-0.3; the basalt fiber is made of The basalt fiber is processed by oxygen plasma etching, then uniformly sprayed with a rubber solution, and then uniformly sprayed with a sucrose laurate solution, wherein the mass ratio of the basalt fiber to the rubber solution and the sucrose laurate solution is 1:0.2-0.35:0.1-0.

2. The mullite fiber is processed by polycrystalline mullite fiber with ethyl glycolate, then uniformly sprayed with a TPU liquid and urethane particles, and the mass ratio of the polycrystalline mullite fiber to the TPU liquid and the urethane particles is 1:0.2-0.3:0.1-0.

2.

2. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The rubber solution is prepared from nitrile rubber, dimethylformamide and polyetheretherketone in a mass ratio of 1:100-120:0.2-0.

6.

3. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The sucrose laurate solution is prepared from sucrose laurate, ethanol and cetearyl alcohol in a mass ratio of 1:90-110:0.2-0.

5.

4. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The TPU liquid is prepared from TPU, polyetheretherketone and dimethylformamide in a mass ratio of 1:0.2-0.5:90-120.

5. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The anti-vibration particles are prepared from silicon dioxide microspheres, polycarbonate microspheres and acetyl chitosan solution in a mass ratio of 1:0.5-1:0.4-0.

6.

6. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The polycaprolactone melt is prepared from a polycaprolactone melt and urea particles in a mass ratio of 1:0.1-0.

2.

7. The C35 basalt fiber concrete for abutments according to claim 1, characterized in that: The waterproofing agent consists of a silane coupling agent KH-570 and an organic silicon waterproofing agent in a mass ratio of 1:0.5-1.

8. The method for preparing C35 basalt fiber concrete for abutments according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Weigh cement, sand, gravel, fly ash, silica fume, and 1 / 4-1 / 3 of the total amount of water and mix them evenly to obtain a primary mixture; S2. Add basalt fiber composite, earthquake-resistant particles, and waterproofing agent to the primary mixture, mix and stir evenly to obtain a mixture; S3. Add a water reducer and 2 / 3-3 / 4 of the total water to the mixture, mix and stir evenly to obtain a mixture; S4. The mixed materials are poured and cured to obtain finished concrete.