Anti-cracking building solid waste road flexible base mixture and preparation method thereof

Abstract

The present application relates to a kind of anti-cracking building solid waste road flexible base mixture and its preparation method, base mixture includes building solid waste mixed aggregate, pitch, mineral powder;Building solid waste mixed aggregate is composed of broken concrete aggregate, broken brick, broken ceramic, broken glass, the mass ratio of broken concrete aggregate, broken ceramic, broken glass in the coarse aggregate of building solid waste mixed aggregate is (68-74):(23-29):(0.1-0.6);Pitch is heavy intersection 70 # matrix asphalt or 90 # matrix asphalt any one or combination thereof;Mineral powder is limestone mineral powder with 90%-100% purity, particle diameter is 0.8um-12um.The present application can reduce the crack of road base caused by temperature shrinkage and dry shrinkage on one hand, effectively prevent the phenomenon that base layer cracking leads to surface layer reflection crack;On the other hand, building solid waste is applied to road base, not only reduces material cost, saves natural mineral resources, but also can protect ecology, solve environmental pollution and other problems, with obvious environmental benefits, economic benefits and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road engineering, in particular to an anti-cracking building solid waste road flexible base mixture and a preparation method thereof. BACKGROUND

[0002] According to incomplete statistics, the amount of various types of concrete in China in 2020 has exceeded 2.377 billion tons, and the per capita consumption of such a huge amount of concrete is about 1.7 tons. However, the production of 1 ton of cement consumes 1.1 tons of quicklime, 0.25 tons of clay, 115 kilograms of coal, 108 degrees of electricity and a certain amount of other auxiliary raw materials, and also discharges a large amount of COx and NOx, polluting the environment. At the same time, among the 2.377 billion tons of concrete, the total CO2 emissions are estimated to be 966 to 1025 million tons (estimated low and high values), and the CO2 emissions from cement production are about 123 million tons, accounting for about 12% of the total emissions. Similarly, as one of the most active industries in the process of national urbanization, the booming development of the transportation industry has made the highway construction need a large amount of sand and stone materials.

[0003] In view of the above problems, domestic and foreign scholars have also carried out relevant research. In order to deal with the problem of large accumulation of solid waste, the common solution is landfill, aggregate preparation into masonry products, or application of solid waste in road base and other measures. However, the landfill measure not only occupies a large amount of land resources, but also the seepage liquid generated by rainwater runoff will pollute the groundwater resources for a long time. In addition, the aggregate prepared from solid waste into masonry products, to some extent, alleviates the problem of accumulation of solid waste, but such products often can only be applied to specific scenarios due to performance defects, and are difficult to be widely applied. The application of solid waste in road base has gradually become a current research hotspot.

[0004] Chinese patent CN112500032 A "Road base mixture prepared from industrial solid waste and its dosage calculation and preparation method" uses cement, fly ash, slag, coal gangue, activator and other materials to prepare road base filling materials. The main components of coal gangue, fly ash and slag in the material are SiO2 and Al2O3 and a small amount of alkaline oxides, which can react with Ca(OH)2 produced by cement hydration to generate C-A-H and C-S-H gel materials with stable chemical properties, so that the mixture has high strength. Chinese patent CN112174602 A "Mixture of concrete road base" is prepared from thiourea waste slag, thermal power slag, cement, fly ash, monocyamine slag and building broken material, which utilizes thiourea production waste slag, is beneficial to soil filling and compaction, can improve the strength of the base, reduce the influence of compression and shrinkage deformation, and improve the water stability and durability of the base. However, the above material system and preparation process are complex, and the amount of materials used is difficult to accurately control. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an anti-cracking building solid waste road flexible base mixture and a preparation method thereof to solve the problems of the prior art.

[0006] The technical scheme for solving the above technical problem is as follows: an anti-cracking building solid waste road flexible base mixture, which is ATB-25 graded asphalt concrete, wherein the oil-stone ratio is 3.7-4.3.

[0007] The anti-cracking building solid waste road flexible base mixture comprises building solid waste mixed aggregate, asphalt, and mineral powder.

[0008] The building solid waste mixed aggregate is composed of broken concrete aggregate, broken bricks and tiles, broken ceramics, and broken glass.

[0009] The asphalt is any one or a combination of heavy 70# base asphalt or 90# base asphalt.

[0010] The mineral powder is limestone mineral powder with a purity of 90%-100% and a particle median diameter of 0.8-12 um.

[0011] The anti-cracking building solid waste road flexible base mixture of the present application uses broken concrete aggregate, broken bricks and tiles, broken ceramics, and broken glass as aggregate, and simultaneously performs strict screening treatment, and prepares the building solid waste road flexible base mixture according to the preparation process of ATB-25 asphalt concrete.

[0012] On the basis of the above technical scheme, the present application can be further improved as follows:

[0013] Further, the oil-stone ratio of the anti-cracking building solid waste road flexible base mixture is 3.9-4.1.

[0014] Further, the maximum nominal particle size of the coarse aggregate of the building solid waste mixed aggregate is not less than 4.75 mm and not more than 31.5 mm, and the maximum nominal particle size of the broken bricks and tiles in the fine aggregate of the building solid waste mixed aggregate is not more than 4.75 mm.

[0015] Further: the mass ratio of the broken concrete aggregate, the broken ceramic, and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6);

[0016] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 31.5mm, and the mass percentage of the particle with a particle size greater than 19mm is not greater than 10%;

[0017] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 19mm, and the mass percentage of the particle with a particle size greater than 13.2mm is not greater than 30%;

[0018] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 13.2mm, and the mass percentage of the particle with a particle size greater than 4.75mm is not greater than 25%;

[0019] The mass percentage of the particle with a maximum nominal particle size of not greater than 4.75mm in the fine aggregate in the building solid waste mixed aggregate is not greater than 35%, the sand equivalent is greater than 60%, and the compactness is less than 12%.

[0020] Further: the mass ratio of the broken concrete aggregate, the broken ceramic, and the broken glass in the building solid waste mixed aggregate is (70-72):(25-27):(0.1-0.6);

[0021] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 31.5mm, and the mass percentage of the particle with a particle size greater than 19mm is not greater than 15%;

[0022] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 19mm, and the mass percentage of the particle with a particle size greater than 13.2mm is not greater than 25%;

[0023] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not greater than 13.2mm, and the mass percentage of the particle with a particle size greater than 4.75mm is not greater than 30%;

[0024] The mass percentage of the particle with a maximum nominal particle size of not greater than 4.75mm in the fine aggregate in the building solid waste mixed aggregate is not greater than 30%, the sand equivalent is greater than 60%, and the compactness is less than 12%.

[0025] Further: the mass ratio of the broken concrete aggregate, the broken ceramic, and the broken glass in the building solid waste mixed aggregate is (72-74):(27-29):(0.1-0.6);

[0026] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5mm, and the mass percentage of particles with a particle size greater than 19mm is not more than 20%;

[0027] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 19mm, and the mass percentage of particles with a particle size greater than 13.2mm is not more than 20%;

[0028] The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 13.2mm, and the mass percentage of particles with a particle size greater than 4.75mm is not more than 35%;

[0029] The mass percentage of particles with a maximum nominal particle size of not more than 4.75mm in the fine aggregate in the building solid waste mixed aggregate is not more than 25%, the sand equivalent is greater than 60%, and the compactness is less than 12%.

[0030] Further: the sand equivalent of the broken bricks and tiles is greater than 60%, and the compactness is less than 12%.

[0031] Further: the asphalt is heavy exchange 70# base asphalt, and the softening point thereof is not less than 46 DEG C, and the dynamic viscosity thereof at 60 DEG C is not less than 180Pa s.

[0032] The application also provides a preparation method of the anti-cracking building solid waste road flexible base mixed material.

[0033] The asphalt is heated to 140-160 DEG C and then added to the building solid waste mixed aggregate at 170-180 DEG C to be stirred uniformly, then the mineral powder is added to be stirred uniformly again, and then the anti-cracking building solid waste road flexible base mixed material is obtained;

[0034] The anti-cracking building solid waste road flexible base mixed material is ATB-25 graded asphalt concrete, and the oil stone ratio is 3.7-4.3.

[0035] The building solid waste mixed aggregate is composed of broken concrete aggregate, broken bricks and tiles, broken ceramics and broken glass after physical grinding strengthening and grading screening, and the mass ratio of the broken concrete aggregate, the broken ceramics and the broken glass in the coarse aggregate of the building solid waste mixed aggregate is (68-74):(23-29):(0.1-0.6).

[0036] The asphalt is heavy exchange 70# base asphalt or 90# base asphalt, or any combination thereof.

[0037] The mineral powder is limestone mineral powder with a purity of 90%-100% and a particle size of 0.8um-12um.

[0038] The adding and mixing method of the mineral powder is an external dry mixing method.

[0039] In the present application, the construction solid waste mixed aggregate generally comprises different types and sizes of gravel, bricks, concrete and other materials; through a physical grinding process, these solid waste materials can be refined and milled, so that the particles are more uniform and the surface is more rough. Such treatment helps to increase the inter-particle friction and nesting effect between the aggregates, thereby improving the cohesion and compressive strength of the aggregate.

[0040] The construction solid waste mixed aggregate can be classified according to certain size range through grading screening. Such treatment can exclude too fine or too coarse particles, improve the uniformity and filling density of the aggregate. Better particle distribution is conducive to forming a tighter aggregate skeleton, improving the mechanical properties of the aggregate.

[0041] After physical grinding and strengthening and grading screening, the contact area between the particles of the construction solid waste mixed aggregate is increased, and the interaction between the particles is enhanced, thereby improving the cohesion and compressive strength of the aggregate. At the same time, better particle distribution and surface roughness reduce the pore space between the aggregates, reducing the water absorption of the aggregate. Such characteristics make the construction solid waste mixed aggregate have good mechanical properties and water resistance in road building materials, which can effectively cope with the mechanical and environmental effects such as compression, fatigue and freeze-thaw in road use.

[0042] The preparation method of the anti-cracking construction solid waste road flexible base mixture of the present application can effectively improve the strength of the construction solid waste mixed aggregate and reduce its water absorption. When asphalt concrete is used as the base layer, the internal compressive stress and the bending tensile stress at the bottom of the layer are significantly affected, and the strength stability is good. At the same time, through the size screen of the material, the problem of fine control of the dosage of the material system mainly affected by chemical composition is solved, not only reducing the material cost, saving natural mineral resources, but also protecting the ecology and solving the problem of environmental pollution, having obvious environmental, economic and social benefits.

[0043] The present application also provides an application of the anti-cracking construction solid waste road flexible base mixture in pavement base paving.

[0044] The application of the anti-cracking construction solid waste road flexible base mixture in pavement base paving serves as a base layer, which needs to act as the main bearing layer and force transmission layer in the pavement structure. The base layer is located below the surface layer and does not directly contact with the vehicle load. When the load is transmitted to the base layer through the surface layer, the stress is much more dispersed than the surface layer, and the stress distribution is also simpler than the surface layer. The base layer is located inside the road structure and does not directly contact with the outside, so the external environment of the base layer is much more stable than the surface layer asphalt concrete, and the influence of temperature and humidity changes on the base layer is much smaller than the surface layer asphalt concrete. DETAILED DESCRIPTION

[0045] The principles and features of the present application are described below, and the examples are only used to explain the present application, and are not used to limit the scope of the present application.

[0046] Example 1

[0047] A crack-resistant building solid waste road flexible base mixture, the crack-resistant building solid waste road flexible base mixture is ATB-25 graded asphalt concrete, the crack-resistant building solid waste road flexible base mixture comprises building solid waste mixed aggregate, asphalt, and mineral powder.

[0048] 1. Building solid waste mixed aggregate

[0049] The mass ratio of broken concrete aggregate, broken ceramic, and broken glass in the coarse aggregate of the building solid waste mixed aggregate is 68:23:0.1.

[0050] The coarse aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 31.5mm-26.5mm, 5.3%; 26.5mm-19mm, 12.4%; 19mm-16mm, 11.8%; 16mm-13.2mm, 12.7%; 13.2mm-9.5mm, 18.1%; 9.5mm-4.75mm, 6.7%.

[0051] The fine aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 4.75mm-2.36mm, 4.8%; 2.36mm-1.18mm, 2.1%; 1.18mm-0.6mm, 4.6%; 0.6mm-0.3mm, 4.9%; 0.3mm-0.15mm, 4.1%; 0.15mm-0.075mm, 8.8%; and below 0.075mm, 3.8%.

[0052] 2. Oil-stone ratio of asphalt mixture

[0053] The ATB-25 graded asphalt concrete is prepared according to the design of “Highway Engineering Asphalt and Asphalt Mixture Test Regulations” JTG E20-2011, the asphalt is heavy exchange 70# base asphalt, the softening point is not less than 46℃, the dynamic viscosity at 60℃ is not less than 180Pa·s, and the oil-stone ratio is 3.8.

[0054] 3. Mineral powder

[0055] The mineral powder of the present embodiment is selected from limestone ground material, and the purity is 96.5%, and the particle size is 1.5μm.

[0056] 4. Preparation of base mixture

[0057] In the preparation of the building solid waste road flexible base mixture, the asphalt is heated to 150℃, then added to the building solid waste mixed aggregate at 175℃, mixed together for 90s, then the mineral powder is added and mixed for another 90s, and then the molding process is performed to obtain the building solid waste road flexible base concrete.

[0058] Example Two

[0059] A crack-resistant building solid waste road flexible base mixture, which is ATB-25 graded asphalt concrete, comprises building solid waste mixed aggregate, asphalt, and mineral powder.

[0060] 1. Building solid waste mixed aggregate

[0061] The mass ratio of the broken concrete aggregate, broken ceramic, and broken glass in the coarse aggregate of the building solid waste mixed aggregate is 71:26:0.3.

[0062] The coarse aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 31.5mm-26.5mm, 5.1%; 26.5mm-19mm, 12.6%; 19mm-16mm, 11.5%; 16mm-13.2mm, 12.4%; 13.2mm-9.5mm, 17.7%; 9.5mm-4.75mm, 5.7%.

[0063] The fine aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 4.75mm-2.36mm, 5.2%; 2.36mm-1.18mm, 1.7%; 1.18mm-0.6mm, 4.4%; 0.6mm-0.3mm, 4.6%; 0.3mm-0.15mm, 4.6%; 0.15mm-0.075mm, 9.3%; below 0.075mm, 5.3%.

[0064] 2. Oil-stone ratio of asphalt mixture

[0065] The ATB-25 graded asphalt concrete is prepared according to the design of “Highway Engineering Asphalt and Asphalt Mixture Test Regulations” JTG E20-2011, the asphalt is heavy exchange 70# base asphalt, the softening point is not less than 46℃, the dynamic viscosity at 60℃ is not less than 180Pa·s, and the oil-stone ratio is 4.0.

[0066] 3. Mineral powder

[0067] The mineral powder of this embodiment is selected from limestone ground material, and the purity is 96.5%, and the particle size is 1.5μm.

[0068] 4. Preparation of base mixture

[0069] In the preparation of the building solid waste road flexible base mixture, the asphalt is heated to 150℃, then added to the building solid waste mixed aggregate at 175℃, mixed together for 90s, then added with the mineral powder and mixed for another 90s, then subjected to the molding process, to obtain the building solid waste road flexible base concrete.

[0070] Example Three

[0071] 1. Building solid waste mixed aggregate

[0072] The mass ratio of the broken concrete aggregate, broken ceramic, and broken glass in the coarse aggregate of the building solid waste mixed aggregate is 74:23:0.5.

[0073] The coarse aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 31.5mm-26.5mm, 4.9%; 26.5mm-19mm, 13.7%; 19mm-16mm, 11.2%; 16mm-13.2mm, 12.1%; 13.2mm-9.5mm, 16.3%; 9.5mm-4.75mm, 5.8%.

[0074] The fine aggregate grading range of the building solid waste mixed aggregate is calculated by the percentage of each particle size stone passing through the standard size sieve hole: 4.75mm-2.36mm, 5.3%; 2.36mm-1.18mm, 2.7%; 1.18mm-0.6mm, 4.9%; 0.6mm-0.3mm, 5.2%; 0.3mm-0.15mm, 4.3%; 0.15mm-0.075mm, 9.3%; below 0.075mm, 4.4%.

[0075] 2. Oil-stone ratio of asphalt mixture

[0076] The ATB-25 graded asphalt concrete is prepared according to the design of the Highway Engineering Asphalt and Asphalt Mixture Test Regulations JTG E20-2011, the asphalt is heavy exchange 70# base asphalt, the softening point is not less than 46℃, the dynamic viscosity at 60℃ is not less than 180Pa·s, and the oil-stone ratio is 4.2.

[0077] 3. Mineral powder

[0078] The mineral powder of the present example is selected from limestone ground material, the purity is 96.5%, and the particle median diameter is 1.5μm.

[0079] 4. Preparation of base mixture

[0080] In the preparation of the building solid waste road flexible base mixture, the asphalt is heated to 150℃, then added to the building solid waste mixed aggregate at 175℃, mixed together for 90s, then the mineral powder is added and mixed for another 90s, and then the building solid waste road flexible base concrete is prepared through the molding process.

[0081] Comparative Examples 1-3

[0082] 1. Building solid waste mixed aggregate

[0083] Comparative Examples 1-3 respectively use the building solid waste mixed aggregate in Example 1, Example 2 and Example 3.

[0084] 2. Oil-stone ratio of asphalt mixture

[0085] The ATB-25 graded asphalt concrete is prepared according to the design in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure JTG E20-2011, the asphalt is heavy exchange 70# base asphalt, the softening point is not less than 46℃, the dynamic viscosity at 60℃ is not less than 180Pa·s, and the oil-stone ratio is 3.8.

[0086] 3. Mineral powder

[0087] The mineral powder in this comparative example is selected from limestone ground material, the purity is 96.5%, and the particle size is 1.5μm.

[0088] 4. Preparation of base mixture

[0089] In the preparation of the building solid waste road flexible base mixture, the asphalt is heated to 150℃, then added to the building solid waste mixed aggregate at a set temperature (155℃, 160℃ and 165℃ in Comparative Examples 1-3 respectively), mixed together for 90s, then the mineral powder is added and mixed for another 90s, and then the building solid waste road flexible base concrete is prepared through the molding process.

[0090] Comparative Example 4

[0091] 1. Building solid waste mixed aggregate

[0092] The building solid waste mixed aggregate in Comparative Example 4 is broken concrete, and the broken concrete aggregate is the same as that in Example 1.

[0093] 2. Oil-stone ratio of asphalt mixture

[0094] The ATB-25 graded asphalt concrete is prepared according to the design in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure JTG E20-2011, and the oil-stone ratio is 3.8.

[0095] 3. Mineral powder

[0096] The mineral powder of the comparative example is selected from limestone powder with a purity of 96.5% and a particle size of 1.5 μm.

[0097] 4. Preparation of the base mixture

[0098] In the preparation of the building solid waste road flexible base mixture, the asphalt is heated to 150 DEG C, then added to the building solid waste mixed aggregate at 175 DEG C, and mixed together for 90 s, then the mineral powder is added and mixed for another 90 s, and then the building solid waste road flexible base concrete is prepared through the molding process.

[0099] The prepared test piece is tested for dynamic stability, rut depth, indirect tensile strength, compressive strength, and four-point bending fatigue regression coefficient, and the test results are shown in Table 1 as follows:

[0100] Table 1

[0101]

[0102] As can be seen from the above test data, the building solid waste road flexible base mixture has excellent performance in terms of permanent deformation resistance (dynamic stability and rut depth), tensile strength, compressive strength, and fatigue performance, and has high application value.

[0103] Compared with the prior art, the building solid waste road flexible base mixture and the preparation method thereof have the following outstanding advantages:

[0104] (1) The building solid waste road flexible base mixture has good strength stability, which ensures that the building solid waste particles as the base aggregate not only prevent the base layer from cracking to cause the phenomenon of reflective cracks in the surface layer, but also meet the strength requirements;

[0105] (2) The application of building solid waste to the road base not only reduces the material cost and saves natural mineral resources, but also protects the ecology and solves the problem of environmental pollution, and has obvious environmental, economic and social benefits;

[0106] (3) The material system of the building solid waste road flexible base mixture includes building solid waste from house demolition, such as crushed concrete aggregate, crushed bricks, crushed ceramics, and crushed glass, and the material design is based on the grading control principle of asphalt concrete, which avoids the fine classification problem of building solid waste to some extent, and solves the problem of fine control of the dosage of the material system due to the main role of chemical composition through the size screening of the material system.

[0107] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A non-cracking construction solid waste road flexible base course mixture characterized by: The anti-cracking building solid waste road flexible base mixture is ATB-25 graded asphalt concrete, wherein the oil-stone ratio is 3.9-4.1; The anti-cracking building solid waste road flexible base mixture comprises building solid waste mixed aggregate, asphalt and mineral powder; The building solid waste mixed aggregate is composed of broken concrete aggregate, broken brick, broken ceramic and broken glass, and the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the coarse aggregate of the building solid waste mixed aggregate is (68-74):(23-29):(0.1-0.6); The asphalt is any one or a combination of heavy-interchange 70# base asphalt or 90# base asphalt; The mineral powder is limestone mineral powder with a purity of 90%-100% and a particle median diameter of 0.8-12 um; The maximum nominal size of the coarse aggregate of the building solid waste mixed aggregate is not less than 4.75 mm and not more than 31.5 mm, and the maximum nominal size of the broken brick in the fine aggregate of the building solid waste mixed aggregate is not more than 4.75 mm; The preparation method of the building solid waste road flexible base mixture is as follows: The asphalt is heated to 140-160 DEG C and then added to the building solid waste mixed aggregate at 170-180 DEG C for uniform stirring, and then the mineral powder is added for secondary uniform stirring, and the anti-cracking building solid waste road flexible base mixture is obtained.

2. The non-cracking construction solid waste road flexible base course mixture as claimed in claim 1 wherein: When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; 3. The non-cracking construction solid waste road flexible base course mixture as claimed in claim 1 wherein: When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; When the mass ratio of the broken concrete aggregate, the broken ceramic and the broken glass in the building solid waste mixed aggregate is (68-70):(23-25):(0.1-0.6), the maximum nominal size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5 mm, and the mass percentage of the aggregate with a particle size greater than 19 mm is not more than 10%; ​ ​ The mass percentage of the maximum nominal particle size of the fine aggregate in the building solid waste mixed aggregate is not more than 4.75mm, and the mass percentage of the maximum nominal particle size of the fine aggregate is not more than 30%, the sand equivalent is greater than 60%, and the firmness is less than 12%.

4. The non-cracking construction solid waste road flexible base course mixture as claimed in claim 1 wherein: When the mass ratio of the broken concrete aggregate, broken ceramic, and broken glass in the building solid waste mixed aggregate is (72-74):(27-29):(0.1-0.6): The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 31.5mm, and the mass percentage of the particle size greater than 19mm is not more than 20%; The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 19mm, and the mass percentage of the particle size greater than 13.2mm is not more than 20%; The maximum nominal particle size of the coarse aggregate in the building solid waste mixed aggregate is not more than 13.2mm, and the mass percentage of the particle size greater than 4.75mm is not more than 35%; The mass percentage of the maximum nominal particle size of the fine aggregate in the building solid waste mixed aggregate is not more than 4.75mm, and the mass percentage of the maximum nominal particle size of the fine aggregate is not more than 25%, the sand equivalent is greater than 60%, and the firmness is less than 12%.

5. The non-cracking construction solid waste road flexible base course mixture as claimed in claim 1 wherein: The sand equivalent of the broken brick and tile is greater than 60%, and the firmness is less than 12%.

6. The non-cracking construction solid waste road flexible base course mixture as claimed in claim 1 wherein: The asphalt is heavy exchange 70# base asphalt, and the softening point thereof is not less than 46℃, and the dynamic viscosity thereof at 60℃ is not less than 180Pa·s.

7. A process for the preparation of the anti-cracking construction solid waste road flexible base mixture as claimed in claim 1 wherein, The method comprises the following steps: The asphalt is heated to 140-160℃, and then added to the building solid waste mixed aggregate at 170-180℃ for stirring, and then the mineral powder is added for secondary stirring, and then discharged to obtain the anti-cracking building solid waste road flexible base mixed aggregate; The anti-cracking building solid waste road flexible base mixed aggregate is ATB-25 graded asphalt concrete, and the oil stone ratio is 3.9-4.1; The building solid waste mixed aggregate is composed of the broken concrete aggregate, broken brick and tile, broken ceramic, and broken glass after physical grinding strengthening and grading screening, and the mass ratio of the broken concrete aggregate, broken ceramic, and broken glass in the coarse aggregate of the building solid waste mixed aggregate is (68-74):(23-29):(0.1-0.6); The asphalt is heavy exchange 70# base asphalt or 90# base asphalt, or any combination thereof; The mineral powder is limestone mineral powder with a purity of 90%-100% and a particle median diameter of 0.8um-12um.

8. The anti-cracking building solid waste road flexible base mixed aggregate according to any one of claims 1-6 is applied in pavement base paving.

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