Full-recycled asphalt mixture based on building solid waste and preparation method thereof

Abstract

The invention relates to the technical field of road engineering, in particular to a fully-recycled asphalt mixture based on building solid waste and a preparation method thereof, and the fully-recycled asphalt mixture comprises the following components in parts by mass: 200-300 parts of building solid waste recycled aggregate, 10-25 parts of mineral powder grade recycled micro powder and 30-80 parts of waterproof coating based recycled asphalt. The fully-recycled asphalt mixture prepared from the building solid wastes improves the utilization rate of the building solid wastes, promotes industrialization of recycled aggregates and recycled asphalt mixtures, is high in strength and high in crack resistance, can maintain relatively good stability and rutting resistance, is easy to obtain materials, is low in cost, and is suitable for large-scale production. According to the recycled asphalt mixture, the construction production cost is greatly reduced, the construction period is shortened, traffic can be rapidly recovered, various performance indexes of the recycled asphalt mixture meet requirements, meanwhile, high-proportion application of the building solid waste meets the national dual-carbon emission reduction policy, economic and environmental benefits are remarkable, and the recycled asphalt mixture has wide application and popularization prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of road engineering, and specifically relates to a fully recycled asphalt mixture based on construction solid waste and a preparation method thereof. Background Art

[0002] With the rapid development of the scale of transportation infrastructure construction and the rapid increase in traffic volume in my country, roads, as important infrastructure in transportation, play a vital role in the development of modern society. Lime, fly ash, and cement stabilized materials account for the vast majority of pavement materials. However, with the soaring price of natural sand and gravel, the resources of traditional natural pavement materials are limited and gradually scarce, which to a certain extent restricts the development of road engineering. In order to improve the application of construction solid waste in road engineering, the use of urban construction waste to produce recycled aggregates has attracted more and more attention. Using recycled aggregates instead of natural aggregates to produce asphalt mixtures can reduce resource consumption, reduce construction costs, and eliminate environmental pollution.

[0003] At present, recycled asphalt mixture technology has received widespread attention. Domestic and foreign research on recycled asphalt mixture technology is to improve asphalt, that is, to add other ingredients to the base asphalt to improve the asphalt, and many modified asphalts have been obtained. These technologies have improved the rutting resistance, cracking resistance, and low temperature resistance of asphalt pavements. Although most of the problems of asphalt pavement diseases have been solved, there are very few studies on the use of construction solid waste in asphalt pavements and asphalt mixtures, and there is no full recycled asphalt mixture technology. It is also necessary to add base asphalt. The production of traditional asphalt has high requirements on equipment, low production efficiency, and unstable product quality. The production process is seriously polluting the environment, and the traditional preparation of asphalt mixtures requires more natural resources and consumes a large amount of material ratios. This is also the reason why it has not been widely promoted and applied.

[0004] In recent years, many scholars have made great progress in promoting the reuse of construction solid waste materials in road construction. The innovation of construction materials and the recycling of solid waste are constantly reflected in the field of pavement materials. The improvement of the resource utilization rate of recycled aggregates will gradually solve the impact of construction waste on the ecological environment, and the occupied land will be restored; and the use of recycled aggregates replaces a large amount of natural aggregates, alleviates the over-exploitation of natural resources, and further protects the ecological environment. The common way to deal with construction solid waste is to store or prepare construction recycled aggregates. The storage of construction solid waste will not only occupy land, but also bring serious water and soil pollution, causing alkalinity of soil and groundwater, and then lead to the destruction of the ecological environment; and construction solid waste, waterproof coatings, recycled micro powders and solid waste regeneration agents, which are potentially active solid waste materials, will produce a solid waste composite synergistic effect after multi-compounding, and can enhance the mechanical properties and durability of recycled asphalt mixtures through chemical reactions. Therefore, using solid waste in multiple composite forms for road base, subbase, roadbed and road surface asphalt layer can not only reduce the demand and dependence on natural aggregates and reduce environmental pollution, but also save project costs and produce more significant economic and social benefits.

[0005] Existing technologies have not yet solved the problem of large-scale utilization of construction solid waste, and existing research has not reached the requirements of full recycling. In today's era of resource shortage, there is an urgent need to seek a fully recycled asphalt mixture based on construction solid waste. Summary of the invention

[0006] Based on the problems existing in the prior art, the present invention proposes a fully recycled asphalt mixture based on construction solid waste and a preparation method thereof, which can realize a preparation method in which recycled aggregate and base asphalt made from construction solid waste replace traditional asphalt mixtures, thereby achieving the purpose of resource utilization of solid waste, and effectively replacing the materials used in traditional asphalt preparation. It has the characteristics of resource recycling, reduction of environmental pollution, large-scale consumption of construction solid waste, and the prepared asphalt mixture meets the requirements, and is adapted to the current trend of technological development.

[0007] The technical solution adopted by the present invention is:

[0008] A fully recycled asphalt mixture based on construction solid waste, comprising the following components in parts by weight:

[0009] 200-300 parts of recycled aggregate from construction solid waste;

[0010] 10-25 parts of mineral powder grade recycled micro powder;

[0011] 30-80 parts of recycled asphalt based on waterproof coating.

[0012] Furthermore, the construction solid waste recycled aggregate is obtained by crushing and screening concrete blocks and discarded bricks from abandoned buildings into recycled coarse aggregate and recycled fine aggregate, and then shaping, cleaning and dust removal to obtain a recycled coarse and fine aggregate mixture.

[0013] Furthermore, the particle shapes of the recycled coarse and fine aggregate mixture are classified into spherical and round spherical shapes, the sphericity parameter is 0.8189-0.8536, the convexity parameter is 0.9341-0.9418, the roughness is 1.068-1.134, and the methylene blue value of the dust after dust removal is not more than 23.5 g / kg.

[0014] Furthermore, after the recycled aggregate of construction solid waste is screened through a 4.75mm sieve, it is measured that the mass fraction of coarse aggregate with a particle size of more than 4.75mm accounts for not less than 80%, among which the particle size classification of recycled coarse aggregate is: 10-20mm, accounting for 60-80%, 5-10mm, accounting for 20-40%, and the particle size classification of recycled fine aggregate is 0.15-4.75mm, accounting for no more than 20%.

[0015] Furthermore, the water absorption rate of the recycled coarse and fine aggregate mixture is 3.6% to 4.7%, wherein the crushing index of the recycled coarse aggregate is not greater than 25%.

[0016] Furthermore, the CaCO3 content in the mineral powder grade regenerated micro powder is required to be not less than 92%, the amount passing through the 150 mesh sieve is not less than 90%, the moisture content is not more than 1.5%, and the apparent density is required to be not less than 2.5g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 431.4~519.5m 2 ·kg, and the average particle size is 8.7~18.3μm.

[0017] Furthermore, the waterproof coating-based regenerated asphalt comprises an asphalt-based waterproof coating and a solid waste regeneration agent, which are respectively recovered from waste waterproofing coiled materials and solid waste components, and the mass fractions are as follows:

[0018] 4-10 parts of asphalt-based waterproof coating;

[0019] 3-5 parts of solid waste regeneration agent.

[0020] Furthermore, the asphalt-based waterproof coating is two or three of solvent-based asphalt waterproof coating, water-emulsion asphalt waterproof coating and water-based asphalt-based waterproof coating.

[0021] Furthermore, the solid waste regeneration agent is obtained by compounding recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows:

[0022] Recycle 3-5 parts of waste cooking oil;

[0023] 2-4 parts of waste engine oil;

[0024] 2-4 parts of waste gear oil.

[0025] In addition, the present invention also provides a method for preparing a fully recycled asphalt mixture based on construction solid waste, comprising the following steps:

[0026] S1. Preparing a mixture of recycled coarse and fine aggregates: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregates are obtained by screening, and 0.15-4.75 mm recycled fine aggregates are obtained by wind classification, and the recycled coarse aggregates and recycled fine aggregates after crushing and screening are shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregates;

[0027] S2. Preparation of mineral powder-grade recycled micropowder: waste concrete blocks and waste bricks are subjected to ball milling and refining treatment, the ball milling time is 0.5-2h, and the amount of recycled micropowder passing through a 150-mesh sieve is not less than 90%, and the amount passing through an 80-mesh sieve is not more than 15%, thereby obtaining recycled micropowders of different finenesses;

[0028] S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot in proportion and stirred at a rate of 50-100r / min for 10-15 minutes to obtain a solid waste regeneration agent;

[0029] S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot and stirred evenly at a rate of 40-60r / min for 15-20 minutes to obtain a waterproof coating-based regenerated asphalt;

[0030] S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred at a rate of 50-65r / min for 10-20 minutes to obtain a waterproof coating-based regenerated asphalt mortar;

[0031] S6. Preparation of fully recycled asphalt mixture based on construction solid waste: put the prepared waterproof coating-based recycled asphalt mortar and recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 50-60r / min for 20-30 minutes to obtain a fully recycled asphalt mixture.

[0032] The beneficial effects of the present invention include:

[0033] (1) The fully recycled asphalt mixture based on construction solid waste and its preparation method of the present invention realize the recycling of resources by recycling construction waste and using fully recycled aggregates to replace traditional natural aggregates, thereby reducing the landfill and accumulation of construction waste. In addition, no new harmful substances will be generated during the processing and use of fully recycled materials, which is environmentally friendly.

[0034] (2) Fully recycled asphalt mortar has good gelling and adhesion properties, which can effectively improve the strength of recycled asphalt mixture, have stronger durability and stability, and can better resist the occurrence of defects such as deformation and cracks. In addition, the fully recycled asphalt mixture has a wide range of applications and can meet the needs of different road grades and usage conditions;

[0035] (3) The processing process of fully recycled asphalt mixture is relatively simple. It can be produced by traditional mixing equipment, and can also be constructed by on-site cold or hot recycling processes. In addition, the laying speed of recycled asphalt mixture is fast, which can shorten the construction period and improve the construction progress. It has strong feasibility and is conducive to the rapid restoration of traffic. Therefore, the recycled asphalt mixture from construction solid waste has broad application prospects and important promotion value in the field of road engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart for preparing a fully recycled asphalt mixture based on construction solid waste according to the present invention;

[0037] Figure 2 The mineral powder-grade regenerated micro powder prepared in Example 3 of the present invention;

[0038] Figure 3 The recycled coarse aggregate is obtained in Example 3 of the present invention;

[0039] Figure 4 The recycled fine aggregate is obtained in Example 3 of the present invention;

[0040] Figure 5 The waterproof coating-based recycled asphalt mortar prepared in Example 3 of the present invention;

[0041] Figure 6 This is the fully recycled asphalt mixture based on construction solid waste prepared in Example 3 of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail in the following examples. It should be noted that the following examples are intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0043] Example 1

[0044] A fully recycled asphalt mixture based on construction solid waste comprises the following components in parts by mass: 200 parts of recycled aggregate from construction solid waste, 10 parts of mineral powder-grade recycled micropowder, and 30 parts of waterproof coating-based recycled asphalt.

[0045] The recycled aggregate from construction solid waste is made from concrete blocks and discarded bricks removed from abandoned buildings. They are crushed and screened into recycled coarse aggregate and recycled fine aggregate, and then shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregate.

[0046] The particle shapes of the recycled coarse and fine aggregate mixture are classified into spherical and rounded shapes, with a sphericity parameter of 0.8189, a convexity parameter of 0.9341, a roughness of 1.068, and a methylene blue value of 21.7 g / kg after dust removal.

[0047] After the recycled aggregates from construction solid waste were screened through a 4.75mm sieve, it was measured that the mass proportion of recycled coarse aggregate with a particle size of more than 4.75mm was 80%, of which the particle size classification of recycled coarse aggregate was: 10-20mm, accounting for 60%, 5-10mm, accounting for 40%, and the particle size classification of recycled fine aggregate was 0.15-4.75mm, accounting for 20%.

[0048] The water absorption rate of the recycled coarse and fine aggregate mixture is 3.6%, of which the crushing index of the recycled coarse aggregate is 25%.

[0049] The CaCO3 content in the mineral powder grade recycled micro powder is 92%, the amount passing through the 150 mesh sieve is 100%, the moisture content is 1.5%, and the apparent density is 2.5g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 519.5m 2 ·kg, and the average particle size is 8.7μm.

[0050] The waterproof coating-based recycled asphalt is composed of asphalt-based waterproof coating and solid waste regeneration agent, which are respectively recovered from waste waterproofing membranes and solid waste components, and the mass fractions are as follows:

[0051] 4 parts of asphalt-based waterproof coating;

[0052] 3 parts of solid waste regeneration agent.

[0053] Asphalt-based waterproof coating is obtained by compounding solvent-based asphalt waterproof coating and water-emulsified asphalt waterproof coating in a ratio of 1:1 by mass.

[0054] The solid waste regeneration agent is compounded from recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows:

[0055] Recycle 3 portions of waste cooking oil;

[0056] 2 parts of waste engine oil;

[0057] 2 parts of waste gear oil.

[0058] The preparation method of the above-mentioned fully recycled asphalt mixture based on construction solid waste comprises the following steps:

[0059] S1. Preparing a mixture of recycled coarse and fine aggregates: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregates are obtained by screening, and 0.15-4.75 mm recycled fine aggregates are obtained by wind classification, and the recycled coarse aggregates and recycled fine aggregates after crushing and screening are shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregates;

[0060] S2. Preparation of mineral powder-grade recycled powder: waste concrete blocks and discarded bricks were subjected to ball milling and refining treatment, the ball milling time was 2h, and the amount of recycled powder passing through a 150-mesh sieve was 100%, and the amount passing through an 80-mesh sieve was 10%, thereby obtaining recycled powders of different finenesses;

[0061] S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot at a ratio of 1.5:1:1 and stirred evenly at a rate of 50r / min for 10 minutes to obtain a solid waste regeneration agent;

[0062] S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot at a ratio of 4:3 and stirred evenly at a rate of 40r / min for 15 minutes to obtain a waterproof coating-based regenerated asphalt;

[0063] S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred evenly at a rate of 50r / min for 10 minutes to obtain a waterproof coating-based regenerated asphalt mortar;

[0064] S6. Prepare a fully recycled asphalt mixture based on construction solid waste: put the prepared waterproof coating-based recycled asphalt mortar and the recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 50r / min for 20 minutes to obtain the fully recycled asphalt mixture described in Example 1.

[0065] Example 2

[0066] A fully recycled asphalt mixture based on construction solid waste comprises the following components in parts by mass: 250 parts of recycled aggregate from construction solid waste, 15 parts of mineral powder-grade recycled micro powder, and 50 parts of waterproof coating-based recycled asphalt.

[0067] The recycled aggregate from construction solid waste is made from concrete blocks and discarded bricks removed from abandoned buildings. They are crushed and screened into recycled coarse aggregate and recycled fine aggregate, and then shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregate.

[0068] The particle shapes of the recycled coarse and fine aggregate mixture are classified into spherical and rounded shapes, with a sphericity parameter of 0.8329, a convexity parameter of 0.9415, a roughness of 1.095, and a methylene blue value of 21.7 g / kg after dust removal.

[0069] After the recycled aggregates from construction solid waste were screened through a 4.75mm sieve, it was measured that the mass proportion of recycled coarse aggregate with a particle size of more than 4.75mm was 90%, of which the particle size classification of recycled coarse aggregate was: 10-20mm, accounting for 70%, 5-10mm, accounting for 30%, and the particle size classification of recycled fine aggregate was 0.15-4.75mm, accounting for 10%.

[0070] The water absorption rate of the recycled coarse and fine aggregate mixture is 4.1%, of which the crushing index of the recycled coarse aggregate is 20%.

[0071] The CaCO3 content in the mineral powder grade recycled micro powder is 95%, the amount passing through the 150 mesh sieve is 90%, the moisture content is 1.25%, and the apparent density is 2.7g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 457.3m 2 ·kg, and the average particle size is 14.5μm.

[0072] The waterproof coating-based recycled asphalt is composed of asphalt-based waterproof coating and solid waste regeneration agent, which are respectively recovered from waste waterproofing membranes and solid waste components, and the mass fractions are as follows:

[0073] 6 parts of asphalt-based waterproof coating;

[0074] 4 parts of solid waste regeneration agent.

[0075] Asphalt-based waterproof coating is obtained by compounding solvent-based asphalt waterproof coating, water-emulsified asphalt waterproof coating and water-based asphalt-based waterproof coating in a ratio of 1:1:1 by mass.

[0076] Solid waste regeneration agent is compounded from recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows:

[0077] Recycle 4 portions of waste cooking oil;

[0078] 3 parts of waste engine oil;

[0079] 3 parts of waste gear oil.

[0080] The preparation method of the above-mentioned fully recycled asphalt mixture based on construction solid waste comprises the following steps:

[0081] S1. Preparing a recycled coarse and fine aggregate mixture: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregate is obtained by screening, and 0.15-4.75 mm recycled fine aggregate is obtained by wind classification, and the recycled coarse aggregate and recycled fine aggregate after crushing and screening are shaped, cleaned and dusted to obtain a recycled coarse and fine aggregate mixture;

[0082] S2. Preparation of mineral powder-grade recycled powder: waste concrete blocks and discarded bricks were subjected to ball milling and refining treatment, the ball milling time was 1h, and the amount of recycled powder passing through a 150-mesh sieve was 90%, and the amount passing through an 80-mesh sieve was 13%, thereby obtaining recycled powders of different finenesses;

[0083] S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot at a ratio of 4:3:3 and stirred evenly at a rate of 70r / min for 12 minutes to obtain a solid waste regeneration agent;

[0084] S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot at a ratio of 1.5:1 and stirred evenly at a rate of 50r / min for 17 minutes to obtain a waterproof coating-based regenerated asphalt;

[0085] S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred evenly at a rate of 55r / min for 15 minutes to obtain a waterproof coating-based regenerated asphalt mortar;

[0086] S6. Preparation of a fully recycled asphalt mixture based on construction solid waste: Place the prepared waterproof coating-based recycled asphalt mortar and the recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 55 / min for 25 minutes to obtain the fully recycled asphalt mixture described in Example 2.

[0087] Example 3

[0088] A fully recycled asphalt mixture based on construction solid waste includes the following components in parts by mass: 270 parts of recycled aggregate from construction solid waste, 18 parts of mineral powder-grade recycled micropowder, and 60 parts of waterproof coating-based recycled asphalt.

[0089] The recycled aggregate from construction solid waste is made from concrete blocks and discarded bricks removed from abandoned buildings. They are crushed and screened into recycled coarse aggregate and recycled fine aggregate, and then shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregate.

[0090] The particle shapes of the recycled coarse and fine aggregate mixture are classified into spherical and rounded shapes, with a sphericity parameter of 0.8329, a convexity parameter of 0.9415, a roughness of 1.095, and a methylene blue value of 21.7 g / kg after dust removal.

[0091] After the recycled aggregates from construction solid waste were screened through a 4.75mm sieve, it was measured that the mass fraction of recycled coarse aggregate with a particle size of more than 4.75mm was 85%, of which the particle size classification of recycled coarse aggregate was: 10-20mm, accounting for 75%, 5-10mm, accounting for 25%, and the particle size classification of recycled fine aggregate was 0.15-4.75mm, accounting for 15%.

[0092] The water absorption rate of the recycled coarse and fine aggregate mixture is 3.9%, of which the crushing index of the recycled coarse aggregate is 18%.

[0093] The CaCO3 content in the mineral powder grade recycled micro powder is 94%, the amount passing through the 150 mesh sieve is 98%, the moisture content is 1%, and the apparent density is 2.85g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 499.4m 2 ·kg, and the average particle size is 9.7μm.

[0094] The waterproof coating-based recycled asphalt is composed of asphalt-based waterproof coating and solid waste regeneration agent, which are respectively recovered from waste waterproofing membranes and solid waste components, and the mass fractions are as follows:

[0095] 7 parts of asphalt-based waterproof coating;

[0096] 4 parts of solid waste regeneration agent;

[0097] Asphalt-based waterproof coating is obtained by compounding solvent-based asphalt waterproof coating and water-based asphalt-based waterproof coating in a 1:1 ratio by mass.

[0098] The solid waste regeneration agent is compounded from recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows:

[0099] Recycle 4 portions of waste cooking oil;

[0100] 2 parts of waste engine oil;

[0101] 3 parts of waste gear oil.

[0102] The preparation method of the above-mentioned fully recycled asphalt mixture based on construction solid waste comprises the following steps:

[0103] S1. Preparing a recycled coarse and fine aggregate mixture: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregate is obtained by screening, and 0.15-4.75 mm recycled fine aggregate is obtained by wind classification, and the recycled coarse aggregate and recycled fine aggregate after crushing and screening are shaped, cleaned and dusted to obtain a recycled coarse and fine aggregate mixture;

[0104] S2. Preparation of mineral powder-grade recycled powder: waste concrete blocks and discarded bricks were subjected to ball milling and refining treatment, the ball milling time was 1.5h, and the amount of recycled powder passing through a 150-mesh sieve was 98%, and the amount passing through an 80-mesh sieve was 12.5%, thereby obtaining recycled powders of different finenesses;

[0105] S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot at a ratio of 2:1:1.5 and stirred evenly at a rate of 80r / min for 13 minutes to obtain a solid waste regeneration agent;

[0106] S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot at a ratio of 1.75:1 and stirred evenly at a rate of 50r / min for 18 minutes to obtain a waterproof coating-based regenerated asphalt;

[0107] S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred uniformly at a rate of 65r / min for 20 minutes to obtain a waterproof coating-based regenerated asphalt mortar;

[0108] S6. Preparation of fully recycled asphalt mixture based on construction solid waste: Put the prepared waterproof coating-based recycled asphalt mortar and recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 55r / min for 30 minutes to obtain the fully recycled asphalt mixture described in Example 3.

[0109] Example 4

[0110] A fully recycled asphalt mixture based on construction solid waste comprises the following components in parts by mass: 300 parts of recycled aggregate from construction solid waste, 25 parts of mineral powder-grade recycled micropowder, and 80 parts of waterproof coating-based recycled asphalt.

[0111] The recycled aggregate from construction solid waste is made from concrete blocks and discarded bricks removed from abandoned buildings. They are crushed and screened into recycled coarse aggregate and recycled fine aggregate, and then shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregate.

[0112] The particle shapes of the recycled coarse and fine aggregate mixture are classified into spherical and rounded shapes, with a sphericity parameter of 0.8536, a convexity parameter of 0.9418, a roughness of 1.134, and a methylene blue value of dust after dust removal of 21.7 g / kg.

[0113] After the recycled aggregates from construction solid waste were screened through a 4.75mm sieve, it was measured that the mass proportion of recycled coarse aggregate with a particle size of more than 4.75mm was 95%, of which the particle size classification of recycled coarse aggregate was: 10-20mm, accounting for 80%, 5-10mm, accounting for 20%, and the particle size classification of recycled fine aggregate was 0.15-4.75mm, accounting for 5%.

[0114] The water absorption rate of the recycled coarse and fine aggregate mixture is 4.7%, of which the crushing index of the recycled coarse aggregate is 15%.

[0115] The CaCO3 content in the mineral powder grade recycled micro powder is 94%, the amount passing through the 150 mesh sieve is 93%, the moisture content is 1.15%, and the apparent density is 2.75g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 431.4m 2 ·kg, and the average particle size is 18.3μm.

[0116] The waterproof coating-based recycled asphalt is composed of asphalt-based waterproof coating and solid waste regeneration agent, which are respectively recovered from waste waterproofing membranes and solid waste components, and the mass fractions are as follows:

[0117] 10 parts of asphalt-based waterproof coating;

[0118] 5 parts of solid waste regeneration agent;

[0119] Asphalt-based waterproof coating is obtained by compounding solvent-based asphalt waterproof coating, water-emulsified asphalt waterproof coating and water-based asphalt-based waterproof coating in a ratio of 1:1:1 by mass.

[0120] The solid waste regeneration agent is compounded from recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows:

[0121] Recycle 5 portions of waste cooking oil;

[0122] 4 parts of waste engine oil;

[0123] 4 parts of waste gear oil;

[0124] The preparation method of the above-mentioned fully recycled asphalt mixture based on construction solid waste comprises the following steps:

[0125] S1. Preparing a mixture of recycled coarse and fine aggregates: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregates are obtained by screening, and 0.15-4.75 mm recycled fine aggregates are obtained by wind classification, and the recycled coarse aggregates and recycled fine aggregates after crushing and screening are shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregates;

[0126] S2. Preparation of mineral powder-grade recycled powder: waste concrete blocks and discarded bricks were subjected to ball milling and refining treatment, the ball milling time was 0.5h, and the amount of recycled powder passing through a 150-mesh sieve was 93%, and the amount passing through an 80-mesh sieve was 15%, thereby obtaining recycled powders of different finenesses;

[0127] S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot at a ratio of 1.25:1:1 and stirred evenly at a rate of 100r / min for 15 minutes to obtain a solid waste regeneration agent;

[0128] S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot at a ratio of 2:1 and stirred evenly at a rate of 60r / min for 20 minutes to obtain a waterproof coating-based regenerated asphalt;

[0129] S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred uniformly at a rate of 65r / min for 20 minutes to obtain a waterproof coating-based regenerated asphalt mortar;

[0130] S6. Prepare a fully recycled asphalt mixture based on construction solid waste: put the prepared waterproof coating-based recycled asphalt mortar and the recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 60r / min for 30 minutes to obtain the fully recycled asphalt mixture described in Example 4.

[0131] In order to detect its strength index, the following indexes were tested on the fully recycled asphalt mixture based on construction solid waste prepared in each embodiment, as shown in the following table:

[0132] Marshall stability test:

[0133] According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), standard rutting specimens were made, and their Marshall stability and flow value indicators were tested in accordance with the regulations. The test results are shown in Table 1.

[0134] Table 1 Marshall test of asphalt mixture

[0135]

[0136]

[0137] Water stability test:

[0138] According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), standard rutting specimens were made, and the immersion Marshall test and freeze-thaw splitting test were carried out in accordance with the regulations. The test results are shown in Table 2.

[0139] Table 2 Asphalt mixture water stability test

[0140]

[0141] Low temperature crack resistance:

[0142] According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), standard rutting specimens were made and their beam bending test indicators were tested in accordance with the regulations. The test results are shown in Table 3.

[0143] Table 3 Asphalt mixture beam test

[0144]

[0145] High temperature stability:

[0146] According to the current "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), standard rutting specimens were made and their rutting dynamic stability indicators were tested in accordance with the regulations. The test results are shown in Table 4.

[0147] Table 4 Asphalt mixture rutting test

[0148]

[0149]

[0150] The research results show that the fully recycled asphalt mixture based on construction solid waste prepared in Examples 1-4 has excellent test results for various indicators, with little difference in performance from traditional asphalt mixtures, and some indicators even exceed the performance of traditional asphalt mixtures. Its high-temperature stability, low-temperature crack resistance, water stability and other indicators all meet the requirements of relevant technical specifications, indicating that it has good driving safety and driving comfort, and meets the functional requirements for use as a road pavement. It provides a new idea for the resource utilization of construction solid waste in road engineering under similar conditions in my country, and has broad prospects for promotion and application.

[0151] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fully recycled asphalt mixture based on construction solid waste, characterized in that: The composition includes the following components in parts by weight: 200-300 parts of recycled aggregate from construction solid waste; 10-25 parts of mineral powder grade recycled micro powder; 30-80 parts of recycled asphalt based on waterproof coating.

2. The fully recycled asphalt mixture based on construction solid waste according to claim 1, characterized in that: The construction solid waste recycled aggregate is obtained by crushing and screening concrete blocks and discarded bricks from abandoned buildings into recycled coarse aggregate and recycled fine aggregate, and then shaping, cleaning and dust removal to obtain a recycled coarse and fine aggregate mixture; wherein the particle shape of the recycled coarse and fine aggregate mixture is classified into spherical and round spherical, the sphericity parameter is 0.8189-0.8536, the convexity parameter is 0.9341-0.9418, the roughness is 1.068-1.134, and the methylene blue value of the dust after dust removal is not more than 23.5g / kg.

3. The fully recycled asphalt mixture based on construction solid waste according to claim 1, characterized in that: After the construction solid waste recycled aggregate is sieved with a 4.75mm sieve, it is measured that the mass fraction of recycled coarse aggregate with a particle size of more than 4.75mm accounts for not less than 80%, among which the particle size classification of recycled coarse aggregate is: 10-20mm, accounting for 60-80%, 5-10mm, accounting for 20-40%, and the particle size classification of recycled fine aggregate is 0.15-4.75mm, accounting for no more than 20%.

4. The fully recycled asphalt mixture based on construction solid waste according to claim 2, characterized in that: The water absorption rate of the recycled coarse and fine aggregate mixture is 3.6% to 4.7%, wherein the crushing index of the recycled coarse aggregate is not more than 25%.

5. The fully recycled asphalt mixture based on construction solid waste according to claim 1, characterized in that: The CaCO3 content in the mineral powder grade regenerated micro powder is required to be no less than 92%, the amount passing through the 150 mesh sieve is no less than 90%, the moisture content is no more than 1.5%, and the apparent density is required to be no less than 2.5g / cm 3 , and the specific surface area of ​​the regenerated micro powder is 431.4~519.5m 2 ·kg, and the average particle size is 8.7~18.3μm.

6. The fully recycled asphalt mixture based on construction solid waste according to claim 1, characterized in that: The waterproof coating-based regenerated asphalt comprises an asphalt-based waterproof coating and a solid waste regeneration agent, which are respectively recovered from waste waterproofing coiled materials and solid waste components, and the mass fractions are as follows: 4-10 parts of asphalt-based waterproof coating; 3-5 parts of solid waste regeneration agent.

7. The fully recycled asphalt mixture based on construction solid waste according to claim 6, characterized in that: The asphalt-based waterproof coating is two or three of solvent-based asphalt waterproof coating, water-emulsion asphalt waterproof coating and water-based asphalt-based waterproof coating.

8. The fully recycled asphalt mixture based on construction solid waste according to claim 6, characterized in that: The solid waste regeneration agent is obtained by compounding recycled waste oil, waste engine oil and waste gear oil, and the mass fractions are as follows: Recycle 3-5 parts of waste cooking oil; 2-4 parts of waste engine oil; 2-4 parts of waste gear oil.

9. A method for preparing a fully recycled asphalt mixture based on construction solid waste according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Preparing a mixture of recycled coarse and fine aggregates: firstly, the discarded concrete blocks and abandoned bricks are preliminarily crushed, and then screened according to a particle size of 10 mm, followed by secondary crushing, and classified according to a particle size of 5 mm, and 5-20 mm recycled coarse aggregates are obtained by screening, and 0.15-4.75 mm recycled fine aggregates are obtained by wind classification, and the recycled coarse aggregates and recycled fine aggregates after crushing and screening are shaped, cleaned and dusted to obtain a mixture of recycled coarse and fine aggregates; S2. Preparation of mineral powder-grade recycled micropowder: waste concrete blocks and waste bricks are subjected to ball milling treatment, the ball milling time is 0.5-2h, and the amount of recycled micropowder passing through a 150-mesh sieve is not less than 90%, and the amount passing through an 80-mesh sieve is not more than 15%, thereby obtaining recycled micropowders of different finenesses; S3. Preparation of solid waste regeneration agent: The recycled waste oil, waste oil and waste gear oil were placed in a stirring pot in proportion and stirred at a rate of 50-100r / min for 10-15 minutes to obtain a solid waste regeneration agent; S4. Preparation of waterproof coating-based regenerated asphalt: The asphalt-based waterproof coating and the solid waste regeneration agent were put into a stirring pot and stirred evenly at a rate of 40-60r / min for 15-20 minutes to obtain a waterproof coating-based regenerated asphalt; S5. Preparation of waterproof coating-based regenerated asphalt mortar: The waterproof coating-based regenerated asphalt and mineral powder-grade regenerated powder were put into a stirring pot and stirred at a rate of 50-65r / min for 10-20 minutes to obtain a waterproof coating-based regenerated asphalt mortar; S6. Preparation of fully recycled asphalt mixture based on construction solid waste: put the prepared waterproof coating-based recycled asphalt mortar and recycled coarse and fine aggregate mixture into a stirring pot and stir evenly at a rate of 50-60r / min for 20-30 minutes to obtain a fully recycled asphalt mixture.

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