A tough concrete based on solid waste materials and its preparation method and application

Abstract

The present invention proposes a tough concrete based on solid waste materials and a preparation method and application thereof, belonging to the technical field of material preparation. The tough concrete based on solid waste materials of the present invention comprises the following components by mass: 388-451 parts of rubber-modified asphalt, 1625-1842 parts of aggregate, 36-72 parts of rubber and 13-39 parts of polyester fiber. The aggregate is sequentially mixed with rubber, polyester fiber and asphalt to obtain a mixture, and the mixture is solidified and formed to obtain the tough concrete based on solid waste materials. The concrete prepared by the present invention can inhibit the development of cracks under the combined action of uneven settlement of new and old bridges and vehicle loads, and has low performance loss after long-term service, good anti-aging ability, and excellent anti-cracking performance. Therefore, the tough concrete obtained by the present invention can be widely used in the joints of the upper bridge deck pavement layer of bridge widening.

Description

Technical Field

[0001] The present invention belongs to the technical field of material preparation, and in particular relates to a tough concrete based on solid waste materials and a preparation method and application thereof. Background Art

[0002] With the rapid economic growth, many existing bridges are unable to cope with the new traffic flow load. Bridge widening technology solves this problem well, enabling existing bridges to improve their transportation capacity and bearing performance in a shorter period of time with less manpower and material resources, thereby meeting new technical standards. Filling the widening longitudinal joints with highly elastic concrete is an important technology in the current application of bridge widening. However, the concrete in the widening longitudinal joints is prone to longitudinal cracks under the combined effects of uneven settlement of new and old bridges and vehicle loads; and if the bond between it and the pavement layer of the new and old bridges is unstable, it will also easily cause cracking and water seepage. In addition, under the action of long-term loads and the environment, concrete is also prone to durability damage. These will lead to the destruction of the concrete structure, thereby greatly reducing the service performance of the concrete at the widening of the bridge deck. Therefore, how to provide an excellent, highly elastic and highly tough asphalt concrete is of great significance.

[0003] With the rapid development of the global rubber industry, especially the automobile industry, a large amount of waste rubber, including waste tires, has accumulated. Whether it is directly landfilled or incinerated, it will cause serious pollution to the environment. Waste rubber is a precious resource. If it is reasonably and efficiently recycled on an environmentally friendly basis, it will bring significant social, economic and environmental benefits to countries around the world.

[0004] To this end, the present invention proposes a tough concrete based on solid waste materials and a preparation method and application thereof. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a tough concrete based on solid waste materials and its preparation method and application. By increasing the oil-stone ratio and compounding rubber particles and polyester fibers, tough concrete for bridge widening is developed.

[0006] To achieve the above objectives, the present invention provides a tough concrete based on solid waste materials, which includes the following components by mass: 388 to 451 parts of rubber-modified asphalt, 1625 to 1842 parts of aggregate, 36 to 72 parts of rubber and 13 to 39 parts of polyester fiber.

[0007] Furthermore, the aggregate is basalt, and the particle size of the basalt is 5 to 10 mm.

[0008] Furthermore, the particle size of the rubber is 1 to 3 mm, and the particle size of the polyester fiber is 5 to 7 mm.

[0009] Furthermore, the rubber modified asphalt has a softening point of 90°C to 100°C, an elastic recovery rate of 60% to 90%, an elongation of 10 to 20 cm at 5°C, and a viscosity of 2 to 5 Pa·s at 190°C.

[0010] Crushing waste rubber tires into rubber particles and applying them to asphalt modification to obtain rubber-modified asphalt can greatly improve the elasticity, antifreeze and crack resistance of asphalt. In the process of interaction between rubber and asphalt, rubber absorbs the most volatile aromatic oil in asphalt. In addition, rubber swells after being added to asphalt, which enhances the cohesion inside the asphalt and makes the asphalt more viscous. The rubber-modified asphalt thus formed has stronger rigidity and deformation resistance than the base asphalt. The modified rubber-modified asphalt has a positive effect on the crack resistance of concrete and the expansion of the stable crack growth performance zone, and can effectively improve the high temperature stability and fatigue resistance of asphalt concrete.

[0011] Furthermore, the following components are included by mass: 451 parts of rubber modified asphalt, 1714 parts of aggregate, 36 parts of rubber and 26 parts of polyester fiber.

[0012] The most common form of damage of the widened longitudinal joints of bridges is cracking due to the influence of many factors. Rubber particles are added to concrete containing asphalt. The excellent high elasticity and flexibility of the rubber particles themselves can partially absorb the concentrated stress caused by cracks in the base layer, thereby inhibiting the development of cracks. At the same time, it can improve the toughness and deformation recovery ability of concrete. The addition of rubber particles also reduces the temperature sensitivity of asphalt mixtures. The temperature range of the maximum temperature shrinkage strain rate gradually develops towards low temperature, the fracture temperature is reduced, the fracture stress is increased, and the elasticity of asphalt is improved in a larger temperature range, so that it has greater elasticity at high temperatures and reduces the accumulation of residual deformation. Both high and low temperature performances are better than those of ordinary asphalt mixtures.

[0013] However, the bridge widening longitudinal seam itself also needs a certain strength, so the present invention continues to mix polyester fibers into asphalt concrete. The polyester fibers are dispersed into the asphalt and contact with the asphalt to form a huge infiltration interface and adsorb the asphalt to form a new interface layer with a certain thickness. The asphalt adsorbs the fiber surface, physically infiltrates the fiber surface, and has chemical bonds, so that the asphalt is arranged in a single molecule on the polyester fiber surface to form a binding force, thereby improving the performance of the concrete. At the same time, the fiber mesh as the second continuous phase can still maintain the integrity of the system when the concrete is destroyed, and to a certain extent prevent the expansion of the matrix damage. With the mixture of the two, the asphalt concrete has a certain strength while maintaining high elastic toughness, meeting the structural requirements.

[0014] Basalt has good wear resistance, high hardness, low water draft, poor electrical conductivity, strong compressive resistance, low crushing value, strong corrosion resistance, large anti-slip coefficient, and strong adhesion with asphalt. Therefore, it is considered to be the best material for highway pavements, etc. The present invention uses basalt aggregates of a single particle size. The single particle size aggregates are embedded in each other to form a skeleton, which is conducive to high-content asphalt filling and can meet the strength and deformation adaptability of concrete.

[0015] The present invention also proposes a method for preparing the tough concrete based on solid waste materials, comprising the following steps:

[0016] The components are weighed according to their mass fractions, and the aggregate is sequentially mixed with rubber, polyester fiber and rubber-modified asphalt to obtain a mixture, and the mixture is solidified and formed to obtain the tough concrete based on solid waste materials.

[0017] Furthermore, the asphalt is added in two times, and the mass ratio of the asphalt added in the first time to the asphalt added in the second time is 2:3.

[0018] Furthermore, the curing temperature is 170-190° C., the pressure is 20-30 MPa, and the time is 2-4 min.

[0019] The present invention also proposes the use of the tough concrete based on solid waste materials in bridge widening.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The concrete prepared by increasing the oil-stone ratio and compounding rubber particles and polyester fibers in the present invention can inhibit the development of cracks under the combined action of uneven settlement of new and old bridges and vehicle loads, and has low performance loss after long-term service, good anti-aging ability and excellent crack resistance. Therefore, the tough concrete obtained by the present invention can be widely used in the connection of the upper bridge deck pavement layer of the bridge widening splicing. DETAILED DESCRIPTION

[0022] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0023] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0024] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0025] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0026] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0027] An embodiment of the present invention provides a tough concrete based on solid waste materials, which includes the following components by mass: 388 to 451 parts of rubber-modified asphalt, 1625 to 1842 parts of aggregate, 36 to 72 parts of rubber and 13 to 39 parts of polyester fiber.

[0028] In some preferred embodiments of the present invention, the tough concrete based on solid waste materials includes the following components by mass: 388-451 parts of rubber-modified asphalt, 1669-1776 parts of aggregate, 36-54 parts of rubber and 13-26 parts of polyester fiber.

[0029] More preferably, the tough concrete based on solid waste materials comprises the following components by mass: 388-451 parts of rubber modified asphalt, 1700-1730 parts of aggregate, 36-40 parts of rubber and 20-26 parts of polyester fiber.

[0030] Most preferably, the toughened concrete based on solid waste materials includes the following components by mass: 451 parts of rubber-modified asphalt, 1714 parts of aggregate, 36 parts of rubber and 26 parts of polyester fiber.

[0031] In some preferred embodiments of the present invention, the aggregate is basalt, and the particle size of the basalt is 5 to 10 mm, more preferably 6 to 9 mm, more preferably 7 to 8 mm, and more preferably 8 mm.

[0032] In some preferred embodiments of the present invention, the particle size of the rubber is 1-3 mm, more preferably 1.5-2.5 mm, more preferably 1.7-2 mm, and more preferably 2 mm; the particle size of the polyester fiber is 5-7 mm, more preferably 5.5-6.5 mm, more preferably 6-6.2 mm, and more preferably 6 mm.

[0033] In some preferred embodiments of the present invention, the rubber modified asphalt is purchased from Jiangsu Baoli Asphalt Co., Ltd., and its technical indicators are as follows after testing: softening point is 93.8°C, elastic recovery rate is 75%, elongation at 5°C is 14.5cm, viscosity at 190°C is 4.5Pa·s, and needle penetration at 25°C is 25mm.

[0034] The embodiment of the present invention further proposes a method for preparing the tough concrete based on solid waste materials, comprising the following steps:

[0035] The components are weighed according to their mass fractions, and the aggregate is sequentially mixed with rubber, polyester fiber and rubber-modified asphalt to obtain a mixture, and the mixture is solidified and formed to obtain the tough concrete based on solid waste materials.

[0036] In some preferred embodiments of the present invention, the aggregate is preferably dried before mixing, and then heated after drying to constant weight, and then mixed with the rubber.

[0037] Preferably, the drying temperature is preferably 100-110°C, more preferably 102-108°C, more preferably 105-106°C; the heating temperature is preferably 175-185°C, more preferably 177-183°C, more preferably 180-181°C, more preferably 180°C.

[0038] In some preferred embodiments of the present invention, the rubber modified asphalt is preferably heated before use to a specified asphalt mixture mixing temperature, but the heating temperature is preferably ≤175°C, further preferably ≤173°C, and more preferably ≤172°C.

[0039] In some preferred embodiments of the present invention, the asphalt is added in two times, and the mass ratio of the asphalt added in the first time to the asphalt added in the second time is 2:3.

[0040] In some preferred embodiments of the present invention, the curing temperature is 170-190°C, more preferably 175-185°C, and more preferably 180°C; the pressure is 20-30MPa, more preferably 23-27MPa, and more preferably 25MPa; the time is 2-4min, more preferably 2.5-3.5min, and more preferably 3min.

[0041] More specifically, the method for preparing tough concrete based on solid waste materials comprises the following steps:

[0042] (1) mixing aggregate and rubber to obtain a mixture a;

[0043] (2) mixing the mixed material a with the polyester fiber to obtain a mixed material b;

[0044] (3) mixing mixture b with the first part of rubber-modified asphalt to obtain mixture c;

[0045] (4) mixing mixture c with the remaining rubber-modified asphalt to obtain mixture d;

[0046] (5) Molding the mixture d to obtain the tough concrete based on solid waste materials.

[0047] In an embodiment of the present invention, the stirring speed of the mixing in step (1) is preferably 70-80 r / min of rotation and 40-50 r / min of revolution, more preferably 73-77 r / min of rotation and 43-47 r / min of revolution, more preferably 75 r / min of rotation and 45 r / min of revolution; the time is preferably 40-50 s, more preferably 42-47 s, more preferably 45-46 s, and more preferably 45 s.

[0048] In an embodiment of the present invention, the stirring speed of the mixing in step (2) is preferably 70-80 r / min of rotation and 40-50 r / min of revolution, more preferably 73-77 r / min of rotation and 43-47 r / min of revolution, more preferably 75 r / min of rotation and 45 r / min of revolution; the time is 40-50 s, more preferably 42-47 s, more preferably 45-46 s, more preferably 45 s.

[0049] In an embodiment of the present invention, the stirring speed of the mixing in step (3) is preferably 70-80 r / min of rotation and 40-50 r / min of revolution, more preferably 73-77 r / min of rotation and 43-47 r / min of revolution, more preferably 75 r / min of rotation and 45 r / min of revolution; the time is 40-50 s, more preferably 42-47 s, more preferably 45-46 s, more preferably 45 s.

[0050] In an embodiment of the present invention, the stirring speed of the mixing in step (4) is preferably 70-80 r / min of rotation and 40-50 r / min of revolution, more preferably 73-77 r / min of rotation and 43-47 r / min of revolution, more preferably 75 r / min of rotation and 45 r / min of revolution; the time is 40-50 s, more preferably 42-47 s, more preferably 45-46 s, more preferably 45 s.

[0051] In the embodiment of the present invention, after the molding in step (5) is completed, the obtained sample is naturally cooled at room temperature to obtain the tough concrete based on solid waste materials.

[0052] Preferably, the natural cooling time is 22 to 26 hours, more preferably 23 to 25 hours, more preferably 24 to 24.5 hours, and more preferably 24 hours.

[0053] The room temperature in the embodiment of the present invention refers to 25±2°C.

[0054] The raw materials used in the embodiments of the present invention are all commercially available.

[0055] The technical solution of the present invention is further illustrated by the following embodiments.

[0056] Example 1

[0057] The following components were weighed in parts by mass: 451 parts of rubber-modified asphalt, 1714 parts of aggregate (basalt, particle size 8 mm), 36 parts of rubber (particle size 2 mm), and 26 parts of polyester fiber (particle size 6 mm).

[0058] Dry the basalt at 105°C to constant weight, and then heat it to 180°C for use; heat the asphalt to the specified asphalt mixture mixing temperature, but the heating temperature is ≤175°C and set aside.

[0059] The method for preparing tough concrete based on solid waste materials in an embodiment of the present invention comprises the following steps:

[0060] (1) basalt and rubber are mixed, and mixed and stirred for 45 seconds at a rotation of 75 r / min and a revolution of 45 r / min to obtain a mixture a;

[0061] (2) Mixing the mixed material a with the polyester fiber, and stirring the mixture for 45 seconds at a rotation speed of 75 r / min and a revolution speed of 45 r / min to obtain a mixed material b;

[0062] (3) Mixing the mixture b with the first part of the rubber modified asphalt (the mass ratio of the first part of the rubber modified asphalt to the remaining rubber modified asphalt is 2:3), and mixing and stirring for 45 seconds at a rotation of 75 r / min and a revolution of 45 r / min to obtain a mixture c;

[0063] (4) Mixing the mixture c with the remaining rubber-modified asphalt, mixing and stirring for 45 seconds at a rotation speed of 75 r / min and a revolution speed of 45 r / min, to obtain a mixture d;

[0064] (5) Mixture d was statically pressed at a temperature of 180°C and a pressure of 25 MPa for 3 min. After solidification, the obtained sample was naturally cooled at room temperature for 24 h to obtain a tough concrete based on solid waste materials.

[0065] Example 2

[0066] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 388 parts of rubber-modified asphalt, 1776 parts of aggregate (basalt, particle size 8 mm), 58 parts of rubber (particle size 2 mm) and 13 parts of polyester fiber (particle size 6 mm).

[0067] Example 3

[0068] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 451 parts of rubber-modified asphalt, 1669 parts of aggregate (basalt, particle size 8 mm), 54 parts of rubber (particle size 2 mm) and 26 parts of polyester fiber (particle size 6 mm).

[0069] Example 4

[0070] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 451 parts of rubber-modified asphalt, 1625 parts of aggregate (basalt, particle size 8 mm), 72 parts of rubber (particle size 2 mm) and 26 parts of polyester fiber (particle size 6 mm).

[0071] Example 5

[0072] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 451 parts of rubber-modified asphalt, 1669 parts of aggregate (basalt, particle size 8 mm), 54 parts of rubber (particle size 2 mm) and 39 parts of polyester fiber (particle size 6 mm).

[0073] Example 6

[0074] The same as Example 1, except that the following components are weighed by mass: 388 parts of rubber-modified asphalt, 1746 parts of aggregate (basalt, particle size 8 mm), 72 parts of rubber (particle size 2 mm) and 13 parts of polyester fiber (particle size 6 mm).

[0075] Example 7

[0076] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 451 parts of rubber-modified asphalt, 1714 parts of aggregate (basalt, particle size 8 mm), 36 parts of rubber (particle size 2 mm) and 39 parts of polyester fiber (particle size 6 mm).

[0077] Example 8

[0078] The same as Example 1, except that the following components are weighed in parts by mass: The following components are weighed in parts by mass: 388 parts of rubber-modified asphalt, 1842 parts of aggregate (basalt, particle size 8 mm), 36 parts of rubber (particle size 2 mm) and 13 parts of polyester fiber (particle size 6 mm).

[0079] Example 9

[0080] The same as Example 1, except that the following components are weighed by mass: 451 parts of rubber-modified asphalt, 1625 parts of aggregate (basalt, particle size 8 mm), 72 parts of rubber (particle size 2 mm) and 39 parts of polyester fiber (particle size 6 mm).

[0081] Performance Testing

[0082] The tough concrete prepared in Examples 1 to 9 is marked as Wn (n is 1 to 7, for example, the tough concrete prepared in Example 1 is marked as W1, the same below), the tough concrete after short-term aging treatment is marked as Dn, and the tough concrete after long-term aging treatment is marked as Cn.

[0083] Under ventilation conditions, the tough concrete Wn prepared in Examples 1 to 9 were evenly spread in an enamel tray, and then heated at a temperature of 135° C. for 4 h. During the heating process, the mixture was turned over once every 1 h. After the heating was completed, static pressing was performed at a temperature of 180° C. and a pressure of 25 MPa for 3 min to obtain the tough concrete Dn after short-term aging treatment. The single-sided toothless saw was used to cut the semicircular specimens for test use.

[0084] Under ventilation conditions, the tough concrete Dn after short-term aging treatment was heated at 85°C for 5 days. During the whole heating process, the specimens were not touched or moved. After the heating, the obtained samples were naturally cooled to room temperature to obtain the tough concrete Cn after long-term aging treatment.

[0085] Fracture performance test

[0086] Spot preparation: Use sandpaper to grind the surfaces of the specimens (tough concrete Wn, tough concrete Dn after short-term aging treatment, and tough concrete Cn after long-term aging treatment), and then use matte white paint to make a white bottom surface on the semicircular surface of the specimen. Matt black paint is randomly sprayed into spots to form a contrast with the white bottom surface of the specimen, thereby forming scattered spots on the surface of the specimen.

[0087] Slit treatment: prefabricated slits are symmetrically opened at the bottom end of the observation surface of the specimen obtained by the spot treatment.

[0088] Fracture test: first place the support in the center of the universal testing machine test bench, and place the slit-treated specimen on the support, then place the loading pad on the top of the specimen, and place the load sensor on the loading pad, then paste the knife-edge thin steel plates on both sides of the prefabricated seam at the bottom of the specimen, and clamp the clip-on extensometer between the two knife-edge thin steel plates, then compress the displacement meter and press it against the knife-edge thin steel plate and fix it through the bracket, then use the universal testing machine to perform displacement loading on the test specimen, and turn on the DIC system for observation and collection, stop loading after the specimen is destroyed, read and store each test data, observe the specimen and take photos for preservation, finally organize the instruments and clean the equipment to prepare for the next test.

[0089] Before using the DIC system to observe the specimen, first aim the camera lens in the system at the specimen observation area, then adjust the aperture, focal length and polarization of the camera lens, and then adjust the direction and polarization of the light to achieve the best observation effect. After collecting images of the specimen surface deformation process, calibrate the system, and reproject the image coordinates to the world coordinates through the calibration parameters to achieve the measurement of the specimen deformation.

[0090] The calculation formula of fracture energy is shown in formula (1)-formula (3):

[0091]

[0092] A lig =(ra)×t (2);

[0093] W f =∫Pdu (3);

[0094] In formula (1), G f is the fracture energy, J / m 2 ; W f is the work of fracture, J; A lig is the area of ​​the ductile zone, m 2 ;

[0095] In formula (2), A lig is the area of ​​the ductile zone, m 2 ; r is the specimen radius, m; a is the cut length, m; t is the specimen thickness, m;

[0096] In formula (3), W f is the work of fracture, J; P is the applied load, N; u is the displacement, m.

[0097] The calculation formula of fracture toughness is shown in formula (4)-formula (5):

[0098]

[0099]

[0100] In formula (4), K IC is the fracture toughness, MPa*m 1 / 2 ;P max is the maximum failure load, MN; r is the specimen radius, m; t is the specimen thickness, m; a is the cut length, m; Y is the stress intensity factor, dimensionless;

[0101] In formula (5), Y is the stress intensity factor, dimensionless; a is the length of the cut, m; r is the radius of the specimen, m.

[0102] The fracture performance analysis results of the specimens of tough concrete W1~W7, tough concrete D1~D7 after short-term aging treatment, and tough concrete C1~C7 after long-term aging treatment are shown in Table 1.

[0103] Table 1 Fracture performance analysis results of each specimen

[0104]

[0105]

[0106] It can be seen from Table 1 that with the increase in the mass fraction of rubber particles, the corresponding fracture load of the specimen increases first and then decreases. Although the fracture load of the specimen of Example 1 is not the largest, its fracture energy and fracture toughness are both the largest. This is because the rubber particles have excellent high elasticity and flexibility in a large temperature range, and can partially absorb the concentrated stress caused by the cracks in the base layer, thereby inhibiting the development of the cracks. After short-term aging and long-term aging, the fracture load, fracture energy and fracture toughness of the specimen of Example 1 decrease the least, indicating that under the ratio of Example 1, the fracture performance of the material reaches the best.

[0107] The present invention develops tough concrete for bridge widening by compounding rubber particles and polyester fibers under a large asphalt-stone ratio, simulates the aging degree of the specimen in daily use by performing different degrees of aging treatment, and then performs fracture tests and experimental observations on the specimens through a universal testing machine and a DIC system, thereby studying the fracture properties of tough concrete under different aging degrees through macroscopic mechanical property tests. The concrete component ratio with the best performance obtained by analysis is 451 parts of rubber-modified asphalt, 1714 parts of basalt, 36 parts of rubber and 26 parts of polyester fiber, i.e., Example 1.

[0108] Comparative Example 1

[0109] The same as Example 1, except that the following components are weighed by mass: 451 parts of rubber-modified asphalt, 1714 parts of aggregate (basalt, particle size 8 mm), and 36 parts of rubber (particle size 2 mm).

[0110] Comparative Example 2

[0111] The same as Example 1, except that the following components are weighed by mass: 451 parts of rubber-modified asphalt, 36 parts of rubber (particle size is 2 mm) and 26 parts of polyester fiber (particle size is 6 mm).

[0112] This comparative example lacks aggregate, and what is prepared is only asphalt mortar, not concrete, and relevant fracture tests cannot be carried out.

[0113] Comparative Example 3

[0114] The same as Example 1, except that the following components are weighed by mass: 451 parts of rubber-modified asphalt, 1714 parts of aggregate (basalt, particle size 8 mm) and 26 parts of polyester fiber (particle size 6 mm).

[0115] Comparative Example 4

[0116] The preparation of rubber-modified asphalt was omitted, and the rubber-modified asphalt was directly replaced with an equal mass of unmodified asphalt. The following components were weighed by mass: 451 parts of asphalt, 1714 parts of aggregate (basalt, particle size 8 mm), 36 parts of rubber (particle size 2 mm) and 26 parts of polyester fiber (particle size 6 mm). The other preparation methods were the same as in Example 1.

[0117] Performance Testing

[0118] The concrete prepared in Comparative Examples 1, 2 to 4 is marked as W'n (n is 1 to 7, for example, the tough concrete prepared in Comparative Example 1 is marked as W'1, the same below), the tough concrete after short-term aging treatment is marked as D'n, and the tough concrete after long-term aging treatment is marked as C'n.

[0119] The test method is the same as in the embodiment, and the test results are shown in Table 2.

[0120] Table 2 Fracture performance analysis results of each specimen of the comparative example

[0121]

[0122]

[0123] As shown in Table 2, when one of the components is reduced, the fracture energy and fracture toughness of the specimen are reduced compared with Example 1. Although the fracture failure load of Comparative Example 3 is larger than that of Example 1, without the addition of rubber particles, the elastic toughness of the material is low, and its fracture energy and fracture toughness are also low, and the material is more likely to fracture and fail; Comparative Example 1 does not incorporate polyester fibers, but instead adds rubber particles to it, and its strength decreases, and it may not meet the requirements of structural use; and the viscosity of asphalt also has a great influence on the fracture performance of the material. Comparative Example 4 selects base asphalt, and its performance is much lower than that of asphalt concrete prepared using rubber modified asphalt. It further illustrates that the interaction between the various material components of the present invention not only ensures the deformation adaptability of the material, but also ensures a certain strength of the material.

[0124] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A tough concrete based on solid waste materials, characterized in that: The following components are included by weight: 388-451 parts of rubber modified asphalt, 1625-1842 parts of aggregate, 36-72 parts of rubber and 13-39 parts of polyester fiber; The aggregate is basalt, and the particle size of the basalt is 5 to 10 mm; The particle size of the rubber is 1 to 3 mm; The particle size of the polyester fiber is 5 to 7 mm; The rubber modified asphalt has a softening point of 90°C to 100°C, an elastic recovery rate of 60% to 90%, an elongation of 10 to 20 cm at 5°C, and a viscosity of 2 to 5 Pa·s at 190°C; The method for preparing tough concrete based on solid waste materials comprises the following steps: Weighing the components according to mass fractions, mixing the aggregate with rubber, polyester fiber and rubber-modified asphalt in sequence to obtain a mixture, and curing the mixture to obtain the tough concrete based on solid waste materials; The asphalt is added twice, and the mass ratio of the first added asphalt to the second added asphalt is 2:3; The curing process is performed at a temperature of 170 to 190° C., a pressure of 20 to 30 MPa, and a time of 2 to 4 minutes.

2. The tough concrete based on solid waste materials according to claim 1, characterized in that: The composition includes the following components by weight: 451 parts of rubber modified asphalt, 1714 parts of aggregate, 36 parts of rubber and 26 parts of polyester fiber.

3. Use of the tough concrete based on solid waste materials as described in any one of claims 1 to 2 in bridge widening.

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