Highway anti-aging concrete and preparation method thereof

Abstract

The application belongs to the technical field of concrete and provides a highway anti-aging concrete and a preparation method thereof.The highway anti-aging concrete comprises the following raw materials: asphalt, coarse aggregate, fine aggregate, modified polyethylene glycol, polypropylene fiber, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber and antioxidant.The application improves the mechanical properties of the concrete by adding the modified polyethylene glycol, and the modified nano titanium dioxide, the modified wollastonite, the ultraviolet absorber and the antioxidant are uniformly dispersed in the network structure, thereby improving the ultraviolet resistance and anti-aging properties of the concrete.The modified nano titanium dioxide has good fluidity and dispersibility.The modified wollastonite is uniformly dispersed in the concrete and forms a stable system with other components.The modified nano titanium dioxide and the modified wollastonite have a synergistic effect, thereby greatly improving the mechanical properties and anti-aging properties of the concrete.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete, and particularly relates to a highway anti-aging concrete and a preparation method thereof. BACKGROUND

[0002] Compared with other civil engineering materials, concrete has the advantages of low cost, high strength, strong decoration, and convenient construction, and is widely used in bridges, tunnels, house construction, port dams, and the like. In highway construction, asphalt concrete is often used.

[0003] With the continuous development of concrete composition materials, the performance requirements for concrete are not limited to compressive strength, and the anti-aging property of concrete is particularly important. The anti-aging property of the current concrete is poor under long-time use and ultraviolet irradiation, which affects the quality of the highway pavement. SUMMARY

[0004] The application provides a highway anti-aging concrete, and aims to solve the above problems.

[0005] The application is implemented as follows: a highway anti-aging concrete comprises the following raw materials in parts by weight: 10-20 parts of asphalt, 120-160 parts of coarse aggregate, 50-80 parts of fine aggregate, 4-8 parts of modified polyethylene glycol, 6-10 parts of polypropylene fiber, 10-16 parts of modified nano titanium dioxide, 8-12 parts of modified wollastonite, 2-4 parts of ultraviolet absorber, and 1-3 parts of antioxidant.

[0006] Preferably, the application comprises the following raw materials in parts by weight: 12-18 parts of asphalt, 130-150 parts of coarse aggregate, 60-70 parts of fine aggregate, 5-7 parts of modified polyethylene glycol, 7-9 parts of polypropylene fiber, 11-15 parts of modified nano titanium dioxide, 9-11 parts of modified wollastonite, 2.5-3.5 parts of ultraviolet absorber, and 1.5-2.5 parts of antioxidant.

[0007] Preferably, the application comprises the following raw materials in parts by weight: 15 parts of asphalt, 140 parts of coarse aggregate, 65 parts of fine aggregate, 6 parts of modified polyethylene glycol, 8 parts of polypropylene fiber, 13 parts of modified nano titanium dioxide, 10 parts of modified wollastonite, 3 parts of ultraviolet absorber, and 2 parts of antioxidant.

[0008] Preferably, the coarse aggregate is at least one of gravel and pebble, and the fine aggregate is one or a combination of sand, fly ash, and mineral powder.

[0009] Preferably, the preparation method of the modified polyethylene glycol is as follows: first, mix the epoxy resin and polyethylene glycol uniformly, then add maleic anhydride and mix uniformly, wherein the mass ratio of the epoxy resin, polyethylene glycol and maleic anhydride is 1:2-4:3-4, under the protection of nitrogen, increase to 120-130℃ at 5℃ / min, react for 3-5h, increase to 150-160℃ at 2℃ / min, react for 2-3h, increase to 170-180℃ at 1℃ / min, react for 1-2h, then separate and purify to obtain the modified polyethylene glycol. The reactivity of the modified polyethylene glycol is enhanced, and after mixing with other components, a network structure is formed, so that the concrete has a stable internal structure, the mechanical properties of the concrete are improved, and the modified nano-titanium dioxide, modified wollastonite, ultraviolet absorber and antioxidant are uniformly dispersed in the network structure, improving the ultraviolet resistance and anti-aging properties of the concrete.

[0010] Preferably, the preparation method of the modified nano-titanium dioxide is as follows: mix 80-90 parts by weight of nano-titanium dioxide, 4-6 parts by weight of talcum powder and 1-3 parts by weight of modified clay uniformly, then add 40-60 parts by weight of glycine and 2-6 parts by weight of sodium hexametaphosphate, heat to 50-60℃, stir for 1-2h, dry and grind to obtain the modified nano-titanium dioxide. By adding talcum powder and modified clay ultraviolet shielding materials to cooperate with nano-titanium dioxide, the ultraviolet shielding effect of nano-titanium dioxide is enhanced, and the mechanical properties of the concrete are also enhanced. Grafting glycine small molecules to the surface of nano-titanium dioxide causes steric hindrance between nano-titanium dioxide particles, overcomes the secondary agglomeration phenomenon between nano-titanium dioxide particles, makes nano-titanium dioxide exhibit good fluidity and dispersibility, and can fully and uniformly perform ultraviolet shielding.

[0011] Preferably, the preparation method of the modified clay is as follows: place the clay in a muffle furnace and program the temperature to increase to 800-900℃, keep the temperature constant for 30-60min, then freeze at -20~-30℃ for 30-50min, and grind to a particle size of 300-400 mesh; add water 10-14 times the mass of the clay and sodium lignosulfonate 0.1-0.3 times the mass of the clay to the ground clay, stir to form a suspension slurry, take the upper suspension liquid to a centrifuge at 1500-2500r / min for 10min, vacuum filter, and spray dry to obtain the modified clay. After calcination, freezing and grinding of the clay, the clay is broken into a finer structure and fully dispersed and combined with other components, so that the performance of the modified nano-titanium dioxide is further improved.

[0012] Preferably, the preparation method of the modified wollastonite is as follows: 10-20 parts by weight of wollastonite is crushed to a particle size of ≤1 mm, immersed in a 30-40 parts by weight inorganic dilute acid solution with a concentration of 10-14 mol / L, and subjected to water bath heat treatment for 1-2 h with a temperature setting of 70-80℃, then 6-10 parts by weight of magnesium chloride solution with a concentration of 25-35% is added to the acidified suspension and stirred thoroughly, and then subjected to ultrasonic hydrothermal treatment for 1-2 h, followed by centrifugal treatment, and after centrifugation, the upper suspension is filtered, dried, and then sent to a rotary drying furnace for calcination for 1-2 h at a calcination temperature of 300-400℃ to obtain the modified wollastonite, the inorganic dilute acid solution is used to dissolve part of the impurities in the channels of the wollastonite particles, the channels are unblocked, and the wollastonite presents a porous feature, which is beneficial to improve the adsorption and adsorb more ultraviolet absorbers, antioxidants and other components, has a slow-release function, and prolongs the durability and anti-aging performance of the concrete, and then the magnesium chloride solution is used to strip and disperse the wollastonite into thinner crystal chips, and the modified wollastonite is uniformly dispersed in the concrete to form a stable system with other components, which can improve the mechanical properties of the concrete and improve the ultraviolet shielding effect.

[0013] Preferably, the ultraviolet absorber is a hydroxybenzophenone substance, and the antioxidant is a hindered phenol substance.

[0014] The application also provides a preparation method of the above highway anti-aging concrete, which comprises the following steps:

[0015] The raw materials are weighed according to the proportion;

[0016] The fine aggregate, coarse aggregate and polypropylene fiber are mixed and stirred uniformly to obtain a mixture A;

[0017] The asphalt is heated to 150-170℃ and continuously stirred, and the mixture A is added into the asphalt and mixed uniformly to obtain a mixture B;

[0018] The mixture B is cooled to 90-100℃, and then the modified polyethylene glycol, modified nano-titanium dioxide, modified wollastonite, ultraviolet absorber and antioxidant are added in sequence and mixed uniformly to obtain the required concrete.

[0019] Compared with the prior art, the embodiments of the application have the following beneficial effects:

[0020] The expressway anti-aging concrete provided by the application has greater specific surface area by adding polypropylene fibers, increases the bonding force between the polypropylene fibers and the concrete matrix, improves the mechanical properties of the concrete, forms a network structure after mixing with other components by adding modified polyethylene glycol, so that the concrete has a stable internal structure, the mechanical properties of the concrete are improved, and the modified nano-titanium dioxide, modified wollastonite, ultraviolet absorbers and antioxidants are uniformly dispersed in the network structure, the anti-ultraviolet and anti-aging properties of the concrete are improved, the ultraviolet shielding effect of the nano-titanium dioxide is enhanced by adding modified nano-titanium dioxide, talcum powder and modified clay in cooperation with the nano-titanium dioxide, the glycine small molecules are grafted to the surface of the nano-titanium dioxide, so that the steric hindrance between the nano-titanium dioxide particles is generated, the secondary agglomeration phenomenon between the nano-titanium dioxide particles is overcome, the nano-titanium dioxide exhibits good fluidity and dispersibility, and can fully and uniformly shield ultraviolet rays; the modified wollastonite is added to adsorb more ultraviolet absorbers, antioxidants and other components, has a slow-release function, prolongs the durability and anti-aging properties of the concrete, the modified wollastonite is uniformly dispersed in the concrete and forms a stable system with other components, improves the mechanical properties of the concrete and the ultraviolet shielding effect, and the modified nano-titanium dioxide and the modified wollastonite have a synergistic effect, greatly improving the mechanical properties and anti-aging properties of the concrete. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The flowchart of the expressway anti-aging concrete provided by the application. DETAILED DESCRIPTION

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description and the drawings are to be regarded as illustrative in nature and are not intended to be limiting of the application; the terminology used in the description and the claims of the present application, and the above accompanying drawings, includes the words "comprising," "having," "containing," and "including," and the like, which are intended to be broad and encompass the items listed thereafter, and any equivalents thereof, as well as additional items. The terminology used herein for the purpose of describing particular embodiments is intended to be in no way limiting of the application.

[0023] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a whole class of comparable embodiments which are claimed as falling within the scope of the present application.

[0024] Embodiment 1

[0025] The embodiment of the present application provides a highway anti-aging concrete, and the concrete comprises the following components in parts by weight: Figure 1 As shown in the formula, the following raw materials are weighed according to the weight parts: asphalt 10 parts, coarse aggregate 120 parts, fine aggregate 50 parts, modified polyethylene glycol 4 parts, polypropylene fiber 6 parts, modified nano-titanium dioxide 10 parts, modified wollastonite 8 parts, ultraviolet absorber 2 parts, and antioxidant 1 part. The fine aggregate, the coarse aggregate and the polypropylene fiber are uniformly mixed and stirred to obtain a mixture A. The asphalt is heated to 150 DEG C, and the mixture A is continuously stirred and mixed into the asphalt to obtain a mixture B. The mixture B is cooled to 90 DEG C, and then the modified polyethylene glycol, the modified nano-titanium dioxide, the modified wollastonite, the ultraviolet absorber and the antioxidant are sequentially added and uniformly mixed to obtain the required concrete.

[0026] Preferably, the coarse aggregate is gravel, and the fine aggregate is mineral powder.

[0027] Specifically, the preparation method of the modified polyethylene glycol is as follows: the epoxy resin and the polyethylene glycol are uniformly mixed, and then the maleic anhydride is added and uniformly mixed, wherein the mass ratio of the epoxy resin, the polyethylene glycol and the maleic anhydride is 1:2:3. Under the protection of nitrogen, the temperature is raised to 120 DEG C at a rate of 5 DEG C / min for 3 h, raised to 150 DEG C at a rate of 2 DEG C / min for 2 h, and raised to 170 DEG C at a rate of 1 DEG C / min for 1 h. Then the modified polyethylene glycol is obtained by separation and purification.

[0028] Preferably, the preparation method of the modified nano-titanium dioxide is as follows: the nano-titanium dioxide 80 parts by weight, talcum powder 4 parts by weight and modified clay 1 part by weight are uniformly mixed, then glycine 40 parts by weight and sodium hexametaphosphate 2 parts by weight are added, heated to 50 DEG C, stirred for 1 h, dried and ground to obtain the modified nano-titanium dioxide.

[0029] Preferably, the preparation method of the modified clay is as follows: the clay is placed in a muffle furnace and programmed to heat to 800 DEG C, and then heated at constant temperature for 30 min. Then the clay is frozen at-20 DEG C for 30 min, and ground to a particle size of 300 mesh. Water with a mass of 10 times the mass of the clay and sodium lignosulfonate with a mass of 0.1.3 times the mass of the clay are added to the ground clay to form a suspension slurry, and the upper suspension liquid is centrifuged in a centrifuge at 1500 r / min for 10 min, vacuum filtered, and spray dried to obtain the modified clay.

[0030] In this embodiment, the modified wollastonite is prepared as follows: 10 parts by weight of wollastonite are crushed to a particle size of ≤1mm, immersed in 30 parts by weight of an inorganic dilute acid solution with a concentration of 10mol / L and heat-treated in a water bath for 1 hour at a temperature of 70℃. Then, 6 parts by weight of a magnesium chloride solution with a concentration of 25% is added to the acidified suspension and stirred thoroughly. After treatment with ultrasonic hydrothermal method for 1 hour, the suspension is centrifuged. After centrifugation, the upper suspension is filtered, dried, and then transported to a rotary drying oven for calcination for 1 hour at a calcination temperature of 300℃ to obtain the modified wollastonite.

[0031] In specific implementation, the ultraviolet absorber is a hydroxybenzophenone-based substance, and the antioxidant is a hindered phenolic substance.

[0032] Example 2

[0033] This invention provides an anti-aging concrete for highways, such as... Figure 1 As shown, the following raw materials are weighed according to the following proportions by weight: 12 parts asphalt, 130 parts coarse aggregate, 60 parts fine aggregate, 5 parts modified polyethylene glycol, 7 parts polypropylene fiber, 11 parts modified nano titanium dioxide, 9 parts modified wollastonite, 2.5 parts ultraviolet absorber, and 1.5 parts antioxidant. The fine aggregate, coarse aggregate, and polypropylene fiber are mixed and stirred evenly to obtain mixture A. The asphalt is heated to 150°C and stirred continuously. Mixture A is then added to the asphalt and mixed evenly to obtain mixture B. Mixture B is cooled to 90°C, and then modified polyethylene glycol, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber, and antioxidant are added in sequence and mixed evenly to obtain the required concrete.

[0034] The coarse aggregate is gravel, and the fine aggregate is sand.

[0035] Specifically, the modified polyethylene glycol is prepared as follows: First, epoxy resin and polyethylene glycol are mixed evenly, then maleic anhydride is added and mixed evenly, wherein the mass ratio of epoxy resin, polyethylene glycol and maleic anhydride is 1:2:3. Under nitrogen protection, the temperature is increased to 120℃ at 5℃ / min and reacted for 3 hours, then increased to 150℃ at 2℃ / min and reacted for 2 hours, then increased to 170℃ at 1℃ / min and reacted for 1 hour. Then, the modified polyethylene glycol is obtained by separation and purification.

[0036] Preferably, the modified nano-titanium dioxide is prepared as follows: 80 parts by weight of nano-titanium dioxide, 4 parts by weight of talc powder, and 1 part by weight of modified clay are mixed evenly, then 40 parts by weight of glycine and 2 parts by weight of sodium hexametaphosphate are added, heated to 50°C, stirred and reacted for 1 hour, dried and ground to obtain modified nano-titanium dioxide.

[0037] The modified clay is prepared as follows: clay is placed in a muffle furnace and heated to 800°C, calcined at a constant temperature for 30 minutes, then frozen at -20°C for 30 minutes, and ground to a particle size of 300 mesh; water with a mass of 10 times the clay mass and sodium lignosulfonate with a mass of 0.1.3 times the clay mass are added to the ground clay and stirred to form a suspension slurry; the upper suspension is centrifuged at 1500 r / min for 10 minutes, vacuum filtered, and spray dried to obtain the modified clay.

[0038] In this embodiment, the modified wollastonite is prepared as follows: 10 parts by weight of wollastonite are crushed to a particle size of ≤1mm, immersed in 30 parts by weight of an inorganic dilute acid solution with a concentration of 10mol / L and heat-treated in a water bath for 1 hour at a temperature of 70℃. Then, 6 parts by weight of a magnesium chloride solution with a concentration of 25% is added to the acidified suspension and stirred thoroughly. After treatment with ultrasonic hydrothermal method for 1 hour, the suspension is centrifuged. After centrifugation, the upper suspension is filtered, dried, and then transported to a rotary drying oven for calcination for 1 hour at a calcination temperature of 300℃ to obtain the modified wollastonite.

[0039] In specific implementation, the ultraviolet absorber is a hydroxybenzophenone-based substance, and the antioxidant is a hindered phenolic substance.

[0040] Example 3

[0041] This invention provides an anti-aging concrete for highways, such as... Figure 1 As shown, the following raw materials are weighed according to the following proportions by weight: 15 parts asphalt, 140 parts coarse aggregate, 65 parts fine aggregate, 6 parts modified polyethylene glycol, 8 parts polypropylene fiber, 13 parts modified nano titanium dioxide, 10 parts modified wollastonite, 3 parts ultraviolet absorber, and 2 parts antioxidant. The fine aggregate, coarse aggregate, and polypropylene fiber are mixed and stirred evenly to obtain mixture A. The asphalt is heated to 160°C and stirred continuously. Mixture A is then added to the asphalt and mixed evenly to obtain mixture B. Mixture B is cooled to 95°C, and then modified polyethylene glycol, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber, and antioxidant are added in sequence and mixed evenly to obtain the required concrete.

[0042] The coarse aggregate is gravel, and the fine aggregate is a mixture of sand, fly ash, and mineral powder in equal proportions.

[0043] Specifically, the preparation method of the modified polyethylene glycol is as follows: first, the epoxy resin and the polyethylene glycol are uniformly mixed, then the maleic anhydride is added and uniformly mixed, wherein the mass ratio of the epoxy resin, the polyethylene glycol and the maleic anhydride is 1:3:3.5, under the protection of nitrogen, it is reacted at 5℃ / min to 125℃ for 4h, 2℃ / min to 155℃ for 2.5h, and 1℃ / min to 175℃ for 1.5h, and then the modified polyethylene glycol is obtained by separation and purification.

[0044] Preferably, the preparation method of the modified nano-titanium dioxide is as follows: 85 parts by weight of nano-titanium dioxide, 5 parts by weight of talcum powder and 2 parts by weight of modified clay are uniformly mixed, then 50 parts by weight of glycine and 4 parts by weight of sodium hexametaphosphate are added, heated to 55℃, stirred for 1.5h, dried and ground to obtain the modified nano-titanium dioxide.

[0045] Preferably, the preparation method of the modified nano-titanium dioxide is as follows: 85 parts by weight of nano-titanium dioxide, 5 parts by weight of talcum powder and 2 parts by weight of modified clay are uniformly mixed, then 50 parts by weight of glycine and 4 parts by weight of sodium hexametaphosphate are added, heated to 55℃, stirred for 1.5h, dried and ground to obtain the modified nano-titanium dioxide.

[0046] In the embodiment, the preparation method of the modified wollastonite is as follows: 15 parts by weight of wollastonite is crushed to a particle size of ≤1mm, immersed in 35 parts by weight of inorganic dilute acid solution with a concentration of 12mol / L, and subjected to water bath heat treatment for 1.5h with a temperature setting of 75℃, then 8 parts by weight of magnesium chloride solution with a concentration of 30% is added to the acidified suspension and fully stirred, and subjected to ultrasonic hydrothermal treatment for 1.5h, then subjected to centrifugal treatment, and after centrifugation, the upper suspension is filtered, dried and conveyed to a rotary drying furnace for calcination for 1.5h at a calcination temperature of 350℃ to obtain the modified wollastonite.

[0047] In specific implementation, the ultraviolet absorber is a hydroxybenzophenone substance, and the antioxidant is a hindered phenol substance.

[0048] Example 4

[0049] The embodiment of the present application provides a highway anti-aging concrete, which comprises the modified nano-titanium dioxide and the modified polyethylene glycol. Figure 1As shown, the following raw materials are weighed according to the proportion: 18 parts of asphalt, 150 parts of coarse aggregate, 70 parts of fine aggregate, 7 parts of modified polyethylene glycol, 9 parts of polypropylene fiber, 15 parts of modified nano titanium dioxide, 11 parts of modified wollastonite, 3.5 parts of ultraviolet absorber, and 2.5 parts of antioxidant; the fine aggregate, coarse aggregate and polypropylene fiber are mixed and stirred uniformly to obtain a mixture A; the asphalt is heated to 170℃, and the mixture A is added into the asphalt and mixed uniformly to obtain a mixture B; the mixture B is cooled to 100℃, and then the modified polyethylene glycol, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber and antioxidant are added in sequence and mixed uniformly to obtain the required concrete.

[0050] The coarse aggregate is gravel, gravel and the like in a mixed ratio, and the fine aggregate is sand, fly ash and the like in a mixed ratio.

[0051] Specifically, the preparation method of the modified polyethylene glycol is as follows: first, the epoxy resin and polyethylene glycol are mixed uniformly, and then maleic anhydride is added and mixed uniformly, wherein the mass ratio of the epoxy resin, polyethylene glycol and maleic anhydride is 1:4:4; under nitrogen protection, it is reacted at 5℃ / min to 130℃ for 5h, 2℃ / min to 160℃ for 3h, and 1℃ / min to 180℃ for 2h, and then the modified polyethylene glycol is obtained by separation and purification.

[0052] Preferably, the preparation method of the modified nano titanium dioxide is as follows: 90 parts by weight of nano titanium dioxide, 6 parts by weight of talc powder and 3 parts by weight of modified clay are mixed uniformly, and then 60 parts by weight of glycine and 6 parts by weight of sodium hexametaphosphate are added, heated to 60℃, stirred for 2h, dried and ground to obtain the modified nano titanium dioxide.

[0053] The preparation method of the modified clay is as follows: the clay is placed in a muffle furnace and programmed to heat to 900℃, and then heated at constant temperature for 60min, and then frozen at-30℃ for 50min, and ground to a particle size of 400 mesh; water with a mass of 14 times the mass of the clay and sodium lignosulfonate with a mass of 0.03 times the mass of the clay are added to the ground clay to form a suspension slurry, and the upper suspension liquid is centrifuged in a centrifuge at 2500r / min for 10min, vacuum filtered, and spray dried to obtain the modified clay.

[0054] In this embodiment, the modified wollastonite is prepared as follows: 20 parts by weight of wollastonite are crushed to a particle size of ≤1mm, immersed in 40 parts by weight of an inorganic dilute acid solution with a concentration of 14mol / L and heat-treated in a water bath for 2 hours at a temperature of 80℃. Then, 10 parts by weight of a magnesium chloride solution with a concentration of 35% is added to the acidified suspension and stirred thoroughly. After treatment with ultrasonic hydrothermal method for 2 hours, the suspension is centrifuged. After centrifugation, the upper suspension is filtered, dried, and then transported to a rotary drying oven for calcination for 2 hours at a calcination temperature of 400℃ to obtain the modified wollastonite.

[0055] In specific implementation, the ultraviolet absorber is a hydroxybenzophenone-based substance, and the antioxidant is a hindered phenolic substance.

[0056] Example 5

[0057] This invention provides an anti-aging concrete for highways, such as... Figure 1 As shown, the following raw materials are weighed according to the following proportions by weight: 20 parts asphalt, 160 parts coarse aggregate, 80 parts fine aggregate, 8 parts modified polyethylene glycol, 10 parts polypropylene fiber, 16 parts modified nano titanium dioxide, 12 parts modified wollastonite, 4 parts ultraviolet absorber, and 3 parts antioxidant. The fine aggregate, coarse aggregate, and polypropylene fiber are mixed and stirred evenly to obtain mixture A. The asphalt is heated to 170°C and stirred continuously. Mixture A is then added to the asphalt and mixed evenly to obtain mixture B. Mixture B is cooled to 100°C, and then modified polyethylene glycol, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber, and antioxidant are added in sequence and mixed evenly to obtain the required concrete.

[0058] The coarse aggregate is at least one of crushed stone and gravel, and the fine aggregate is one or more combinations of sand, fly ash, and mineral powder.

[0059] Specifically, the modified polyethylene glycol is prepared as follows: First, epoxy resin and polyethylene glycol are mixed evenly, then maleic anhydride is added and mixed evenly, wherein the mass ratio of epoxy resin, polyethylene glycol and maleic anhydride is 1:4:4. Under nitrogen protection, the temperature is increased to 130℃ at 5℃ / min and reacted for 5h, increased to 160℃ at 2℃ / min and reacted for 3h, and increased to 180℃ at 1℃ / min and reacted for 2h. Then, the modified polyethylene glycol is obtained by separation and purification.

[0060] Preferably, the modified nano-titanium dioxide is prepared as follows: 90 parts by weight of nano-titanium dioxide, 6 parts by weight of talc powder, and 3 parts by weight of modified clay are mixed evenly, then 60 parts by weight of glycine and 6 parts by weight of sodium hexametaphosphate are added, the mixture is heated to 60°C, stirred and reacted for 2 hours, dried and ground to obtain modified nano-titanium dioxide.

[0061] The modified clay is prepared by the following method: the clay is placed in a muffle furnace and heated to 900 DEG C at a programmed rate, and then kept at this temperature for 60 min, and then frozen at -30 DEG C for 50 min, and then ground to a particle size of 400 mesh; water is added to the ground clay in an amount of 14 times the mass of the clay, and sodium lignosulfonate is added in an amount of 0.3 times the mass of the clay, and stirred to form a suspension slurry, and the upper suspension liquid is centrifuged in a centrifuge at 2500 r / min for 10 min, and then vacuum filtered, and then spray dried to obtain the modified clay.

[0062] In this embodiment, the modified wollastonite is prepared by the following method: 20 parts by weight of wollastonite is ground to a particle size of 1 mm or less, and then immersed in a 40 parts by weight of inorganic dilute acid solution with a concentration of 14 mol / L, and then subjected to water bath heat treatment at a temperature of 80 DEG C for 2 h, and then 10 parts by weight of magnesium chloride solution with a concentration of 35% is added to the acidified suspension and stirred, and then subjected to ultrasonic hydrothermal treatment for 2 h, and then centrifuged, and then the upper suspension liquid is filtered, dried, and then transferred to a rotary drying oven and calcined at a temperature of 400 DEG C for 2 h to obtain the modified wollastonite.

[0063] In specific implementation, the ultraviolet absorber is a hydroxybenzophenone substance, and the antioxidant is a hindered phenol substance.

[0064] Comparative Example 1: compared with Example 3, no modified nano-titanium dioxide is contained;

[0065] Comparative Example 2: compared with Example 3, no modified wollastonite is contained;

[0066] Comparative Example 3: compared with Example 3, no modified nano-titanium dioxide and no modified wollastonite are contained;

[0067] The concrete prepared in Examples 1-5 and Comparative Examples 1-2 is molded and cured to obtain concrete test blocks, and the performance of the obtained concrete test blocks is detected, and the test results are shown in Table 1.

[0068] Table 1

[0069]

[0070] In the ultraviolet aging condition in the ultraviolet aging tensile strength ratio, the ultraviolet aging box has an ultraviolet intensity of 250 W / m 2 , an aging temperature of 60 DEG C, and an aging time of 21 d.

[0071] From the above results, it can be seen that the concrete in the present application has high strength and crack resistance, and has good ultraviolet resistance and good aging resistance. By adding modified nano-titanium dioxide and modified wollastonite, the two have a synergistic effect, greatly improving the mechanical properties and aging resistance of the concrete.

[0072] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the protection scope of the application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still combine, add or delete or make other adjustments to the features of the embodiments of the present application according to the circumstances without conflict and without creative labor, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence. These technical solutions also belong to the scope of protection of the present application.

Claims

1. A type of anti-aging concrete for highways, characterized in that, It includes the following raw materials in parts by weight: 10-20 parts asphalt, 120-160 parts coarse aggregate, 50-80 parts fine aggregate, 4-8 parts modified polyethylene glycol, 6-10 parts polypropylene fiber, 10-16 parts modified nano titanium dioxide, 8-12 parts modified wollastonite, 2-4 parts ultraviolet absorber, and 1-3 parts antioxidant. The modified polyethylene glycol is prepared as follows: First, epoxy resin and polyethylene glycol are mixed evenly, then maleic anhydride is added and mixed evenly. The mass ratio of epoxy resin, polyethylene glycol and maleic anhydride is 1:2-4:3-4. Under nitrogen protection, the temperature is increased to 120-130℃ at 5℃ / min and reacted for 3-5 hours, increased to 150-160℃ at 2℃ / min and reacted for 2-3 hours, and increased to 170-180℃ at 1℃ / min and reacted for 1-2 hours. Then, the modified polyethylene glycol is obtained by separation and purification. The modified nano-titanium dioxide is prepared as follows: 80-90 parts by weight of nano-titanium dioxide, 4-6 parts by weight of talc powder, and 1-3 parts by weight of modified clay are mixed evenly. Then, 40-60 parts by weight of glycine and 2-6 parts by weight of sodium hexametaphosphate are added. The mixture is heated to 50-60℃, stirred for 1-2 hours, dried, and ground to obtain the modified nano-titanium dioxide. The modified clay is prepared as follows: Clay is placed in a muffle furnace and heated to 800-900℃ using a programmed temperature riser. Calcination at ℃ for 30-60 minutes, followed by freezing at -20 to -30℃ for 30-50 minutes, and grinding to a particle size of 300-400 mesh; adding 10-14 times the weight of water and 0.1-0.3 times the weight of sodium lignosulfonate to the ground clay and stirring to form a suspension slurry; centrifuging the upper suspension at 1500-2500 r / min for 10 minutes, vacuum filtering, and spray drying to obtain modified clay; The modified wollastonite is prepared as follows: 10-20 parts by weight of wollastonite are crushed to a particle size of ≤1mm, immersed in 30-40 parts by weight of an inorganic dilute acid solution with a concentration of 10-14mol / L and heat-treated in a water bath for 1-2 hours at a temperature of 70-80℃. Then, 6-10 parts by weight of a magnesium chloride solution with a concentration of 25-35% are added to the acidified suspension and stirred thoroughly. After treatment with ultrasonic hydrothermal method for 1-2 hours, the suspension is centrifuged. After centrifugation, the upper suspension is filtered, dried, and then transported to a rotary drying oven for calcination for 1-2 hours at a temperature of 300-400℃ to obtain the modified wollastonite.

2. The anti-aging concrete for highways as described in claim 1, characterized in that, The raw materials include the following by weight: 12-18 parts asphalt, 130-150 parts coarse aggregate, 60-70 parts fine aggregate, 5-7 parts modified polyethylene glycol, 7-9 parts polypropylene fiber, 11-15 parts modified nano titanium dioxide, 9-11 parts modified wollastonite, 2.5-3.5 parts ultraviolet absorber, and 1.5-2.5 parts antioxidant.

3. The anti-aging concrete for highways as described in claim 2, characterized in that, The raw materials include the following by weight: 15 parts asphalt, 140 parts coarse aggregate, 65 parts fine aggregate, 6 parts modified polyethylene glycol, 8 parts polypropylene fiber, 13 parts modified nano titanium dioxide, 10 parts modified wollastonite, 3 parts ultraviolet absorber, and 2 parts antioxidant.

4. The anti-aging concrete for highways as described in claim 1, characterized in that, The coarse aggregate is at least one of crushed stone and gravel, and the fine aggregate is one or more of sand, fly ash, and mineral powder.

5. The anti-aging concrete for highways as described in claim 1, characterized in that, The ultraviolet absorber is a hydroxybenzophenone derivative, and the antioxidant is a hindered phenolic derivative.

6. The method for preparing anti-aging concrete for highways as described in any one of claims 1-5, characterized in that, Includes the following steps: Weigh each ingredient according to the proportions; Fine aggregate, coarse aggregate, and polypropylene fiber are mixed and stirred evenly to obtain mixture A; Heat the asphalt to 150-170℃, stir continuously, and add mixture A to the asphalt and mix evenly to obtain mixture B; Cool mixture B to 90-100℃, then add modified polyethylene glycol, modified nano titanium dioxide, modified wollastonite, ultraviolet absorber, and antioxidant in sequence, and mix evenly to obtain the desired concrete.

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