A method for preparing recycled basalt asphalt mixture

Abstract

The present invention provides a method for preparing a regenerated basalt asphalt mixture, and belongs to the technical field of road engineering materials. The regenerated basalt asphalt mixture includes basalt coarse aggregate, basalt fine aggregate, limestone fine aggregate, regenerated basalt coarse aggregate, limestone mineral powder, high-viscoelastic SBS modified asphalt and lignin fiber. The present invention also provides a method for preparing a regenerated basalt asphalt mixture and a method for preparing a high-viscoelastic modifier. The regenerated basalt asphalt mixture prepared by the present invention can greatly improve the road performance of asphalt concrete, improve the viscoelastic properties of the regenerated basalt asphalt mixture, fully improve the utilization rate of basalt ore resources, make the regenerated basalt asphalt mixture more widely used, and increase the market space.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a method for preparing a recycled basalt asphalt mixture. Background Art

[0002] Asphalt concrete paved roads, commonly known as asphalt roads and asphalt roads, are a widely used road surface. For example, most urban traffic road surfaces, inter-city traffic trunk roads (including highways and expressways) are paved with asphalt concrete.

[0003] For example, Chinese patent CN202122957579.9 discloses an anti-crack mat for asphalt concrete paved roads, wherein the anti-crack mat is laid between the base layer of the road surface and the asphalt concrete wear layer; the anti-crack mat has an asphalt-based polymer layer 1, a basalt fiber base layer, an asphalt-based polymer layer 2, an aramid fiber base layer and an asphalt-based polymer layer 3 composited together from top to bottom; the asphalt-based polymer layer 1 of the anti-crack mat is used to connect with the asphalt concrete wear layer; the asphalt-based polymer layer 3 of the anti-crack mat is used to connect with the base layer. The utility model can effectively block and reduce the thermal shrinkage stress acting on the road surface, thereby effectively inhibiting the tendency of cracks to reflect through the asphalt concrete wear layer, so that the asphalt concrete wear layer is free from, or at least less affected by, multi-directional displacement and shear stress, preventing and delaying the occurrence of cracks on the road surface, and achieving an anti-crack effect.

[0004] For example, Chinese patent CN111499268A discloses an asphalt mixture with improved microwave absorption efficiency, which is composed of the following raw materials in weight percentage: 8% to 15% asphalt filler mixed with magnetite powder, 4% to 6% asphalt binder, 40% to 60% basalt coarse aggregate, and 20% to 40% basalt fine aggregate; wherein the asphalt filler mixed with magnetite powder is a mixture of magnetite powder and ordinary limestone powder, and the weight of the magnetite powder accounts for 31% to 100% of the total weight of the asphalt filler mixed with magnetite powder. The present invention also provides a method for preparing an asphalt mixture with improved microwave absorption efficiency. The present invention improves the microwave absorption efficiency of the asphalt mixture, ensures the excellent road performance of the asphalt mixture, has the characteristics of high microwave heating efficiency, low economic cost, good construction performance and road performance, and can be used for road maintenance and deicing, rapid repair of potholes, asphalt mixture regeneration and other aspects.

[0005] However, the current traffic characteristics of traditional asphalt pavements are: high traffic density, heavy axle loads, short load gaps, high speeds and channelization. Under the influence of high temperatures, heavy traffic and channelized traffic, the probability of rutting on the road surface is high, and road cracks often occur. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a method for preparing a recycled basalt asphalt mixture, which mainly improves the dynamic stability, water immersion residual stability and splitting tensile strength of the asphalt mixture.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] The first aspect of the present invention provides a recycled basalt asphalt mixture comprising the following components in parts by weight:

[0009] Basalt coarse aggregate 315-335 parts

[0010] Basalt fine aggregate 205-225 parts

[0011] Limestone fine aggregate 105-120 parts

[0012] Recycled basalt coarse aggregate 180-200 parts

[0013] Limestone powder 85-100 parts

[0014] High-viscosity SBS modified asphalt 50-60 parts

[0015] 1-5 parts of lignin fiber.

[0016] As a further preferred embodiment of the present invention, the particle size of the basalt coarse aggregate is 2.36-13.2 mm, the particle size of the basalt fine aggregate and the limestone fine aggregate is 0.075-2.36 mm, and the particle size of the limestone ore powder is less than 0.075 mm.

[0017] As a further preferred embodiment of the present invention, the particle sizes of the basalt coarse aggregate are 2.36 mm, 4.75 mm, 9.5 mm and 13.2 mm, the weight of the basalt coarse aggregate with a particle size of 2.36 mm accounts for 14% to 20% of the total weight of the basalt aggregate, the weight of the basalt coarse aggregate with a particle size of 4.75 mm accounts for 19% to 32% of the total weight of the basalt aggregate, the weight of the basalt coarse aggregate with a particle size of 9.5 mm accounts for 16% to 24% of the total weight of the basalt aggregate, and the weight of the basalt coarse aggregate with a particle size of 13.2 mm accounts for 0% to 10% of the total weight of the basalt aggregate.

[0018] As a further preferred embodiment of the present invention, the particle size of the basalt fine aggregate is 0.075mm, 0.15mm, 0.3mm, 0.6mm and 1.18mm, the weight of the basalt fine aggregate with a particle size of 0.075mm accounts for 1% to 7% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.15mm accounts for 2% to 5% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.3mm accounts for 3% to 9% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.6mm accounts for 5% to 11% of the total weight of the basalt aggregate, and the weight of the basalt fine aggregate with a particle size of 1.18mm accounts for 9% to 13% of the total weight of the basalt aggregate.

[0019] A second aspect of the present invention provides a method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0020] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10-15mm size part and heated by the regeneration drying drum;

[0021] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0022] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0023] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 170-180℃.

[0024] As a further preferred embodiment of the present invention, the heating temperature in step 1 is 150-165°C, and the heating temperature of the basalt aggregate in step 2 is 180-190°C.

[0025] As a further preferred embodiment of the present invention, in step 3, the dry mixing speed is 50-80 rpm, and the dry mixing time is 10-30 min.

[0026] As a further preferred embodiment of the present invention, in step 4, the high-viscoelastic SBS modified asphalt is added and mixed in a molten state, and the preparation method is as follows:

[0027] Firstly, the finished SBS modified asphalt is heated to 170-190°C, and then the high-viscoelastic modifier is added into an oil bath pot and stirred for 40-100 minutes to produce the high-viscoelastic SBS modified asphalt.

[0028] As a further preferred embodiment of the present invention, the dosage of the high viscoelastic modifier is 5-10%.

[0029] The third aspect of the present invention provides a method for preparing a high viscoelastic modifier:

[0030] S1: Add 0.05-0.6 parts of bismaleimidodiphenylmethane and 3-8 parts of amine-terminated nitrile liquid rubber to 200-300 parts of toluene, introduce nitrogen, add 5-9 parts of organic base, the reaction temperature is 60-75°C, stir and react for 0.5-2h, then add 10-18 parts of cerium methacrylate, stir and react for 1-3h;

[0031] S2: Add 2-5 parts of benzoyl peroxide, 40-60 parts of C9 petroleum resin, and 0.03-0.2 parts of allyl zinc bromide, and continue to stir and react for 2-5 hours; evaporate the toluene under reduced pressure to obtain a high viscoelastic modifier.

[0032] As further preferred embodiment of the present invention, the organic base is selected from: triethylamine, diethylmethylamine, diisopropylethylamine, ethylenediamine, diethylenetriamine, triethylenetetramine.

[0033] As a further preferred embodiment of the present invention, the amine-terminated nitrile liquid rubber is a commercially available product with a number average molecular weight of 3000-4000 and an amino content of 14-20%, such as Hycar-ATBN amine-terminated nitrile liquid rubber.

[0034] Reaction mechanism:

[0035] (1) Bismaleimidodiphenylmethane undergoes an amino addition reaction with amine-terminated nitrile liquid rubber, and then continues to undergo an addition reaction with cerium methacrylate.

[0036] (2) The product in step (1) undergoes a graft polymerization reaction with C9 petroleum resin and allyl zinc bromide to obtain a high viscoelastic modifier.

[0037] Technical effects:

[0038] Compared with the prior art, the method for preparing a regenerated basalt asphalt mixture of the present invention has the following significant effects:

[0039] 1) The regenerated basalt asphalt mixture prepared by the present invention can greatly improve the road performance of asphalt concrete, such as the dynamic stability, water immersion residual stability and splitting tensile strength of the asphalt mixture, significantly improve the life of the asphalt pavement, and greatly reduce the maintenance cost of the asphalt pavement.

[0040] 2) The preparation method provided by the present invention has simple reaction steps and is easy to operate, thus providing feasibility and convenience for industrial production.

[0041] 3) The preparation method of the present invention greatly improves the utilization rate of basalt ore resources, fully utilizes different types of basalt aggregates and recycled basalt, and has significant economic cost advantages.

[0042] 4) The preparation method of a high viscoelastic modifier provided by the present invention can effectively improve the viscoelastic properties of the recycled basalt asphalt mixture, thereby making the recycled basalt asphalt mixture more widely used and increasing the market space. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Asphalt mixture test report;

[0044] Figure 2 Asphalt mixture after melting. DETAILED DESCRIPTION

[0045] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0046] Example 1

[0047] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0048] Basalt coarse aggregate 315kg

[0049] Basalt fine aggregate 225kg

[0050] Limestone fine aggregate 105kg

[0051] Recycled basalt coarse aggregate 200kg

[0052] Limestone powder 85kg

[0053] High Viscoelastic SBS Modified Asphalt 50kg

[0054] 1kg of lignin fiber.

[0055] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0056] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0057] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0058] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0059] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 170°C.

[0060] In this example, the heating temperature in step 1 is 150°C, and the heating temperature of the basalt aggregate in step 2 is 180°C.

[0061] In this example, the dry mixing speed in step 3 is 50 rpm and the dry mixing time is 30 min.

[0062] In this example, the high-viscoelastic SBS modified asphalt in step 4 is added and mixed in a molten state, and the preparation method is as follows:

[0063] First, the finished SBS modified asphalt is heated to 170°C, and a high-viscoelastic modifier is added into an oil bath pot and stirred for 75 minutes to produce a high-viscoelastic SBS modified asphalt.

[0064] In this example, the dosage of the high-viscoelastic modifier is 5%.

[0065] The preparation method of the high viscoelastic modifier in this example is:

[0066] S1: Add 0.1 kg of bismaleimidodiphenylmethane and 3 kg of amino-terminated nitrile liquid rubber to 200 kg of toluene, introduce nitrogen, add 5 kg of organic base, the reaction temperature is 60°C, stir and react for 0.5 h, then add 10 kg of cerium methacrylate, stir and react for 1 h;

[0067] S2: Add 2kg of benzoyl peroxide, 40kg of C9 petroleum resin, and 0.03kg of allyl zinc bromide, and continue stirring and reacting for 2h; evaporate the toluene under reduced pressure to obtain a high viscoelastic modifier.

[0068] The organic base is selected from triethylamine.

[0069] The amine-terminated nitrile liquid rubber is a commercially available product selected from Hycar-ATBN amine-terminated nitrile liquid rubber.

[0070] Example 2

[0071] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0072] Basalt coarse aggregate 325kg

[0073] Basalt fine aggregate 215kg

[0074] Limestone fine aggregate 115kg

[0075] Recycled basalt coarse aggregate 190kg

[0076] Limestone powder 92kg

[0077] High Viscoelastic SBS Modified Asphalt 55kg

[0078] 3kg of lignin fiber.

[0079] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0080] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0081] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0082] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0083] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 175°C.

[0084] In this example, the heating temperature in step 1 is 160°C, and the heating temperature of the basalt aggregate in step 2 is 185°C.

[0085] In this example, the dry mixing speed in step 3 is 65 pm and the dry mixing time is 20 min.

[0086] In this example, the high-viscoelastic SBS modified asphalt in step 4 is added and mixed in a molten state, and the preparation method is as follows:

[0087] First, the finished SBS modified asphalt is heated to 180°C, and a high-viscoelastic modifier is added into an oil bath pot and stirred for 65 minutes to produce a high-viscoelastic SBS modified asphalt.

[0088] In this example, the dosage of the high-viscoelastic modifier is 7.5%.

[0089] The preparation method of the high viscoelastic modifier in this example is:

[0090] S1: Add 0.3 kg of bismaleimidodiphenylmethane and 5 kg of amino-terminated nitrile liquid rubber to 250 kg of toluene, introduce nitrogen, add 7 kg of organic base, the reaction temperature is 68°C, stir and react for 1.2 hours, then add 14 kg of cerium methacrylate, stir and react for 2 hours;

[0091] S2: Add 4 kg of benzoyl peroxide, 50 kg of C9 petroleum resin, and 0.11 kg of allyl zinc bromide, and continue to stir and react for 3.5 hours; evaporate the toluene under reduced pressure to obtain a high viscoelastic modifier.

[0092] The organic base is selected from ethylenediamine.

[0093] The amine-terminated nitrile liquid rubber is a commercially available product selected from Hycar-ATBN amine-terminated nitrile liquid rubber.

[0094] Example 3

[0095] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0096] Basalt coarse aggregate 335kg

[0097] Basalt fine aggregate 205kg

[0098] Limestone fine aggregate 120kg

[0099] Recycled basalt coarse aggregate 180kg

[0100] Limestone powder 100kg

[0101] High Viscoelastic SBS Modified Asphalt 60kg

[0102] 5kg of lignin fiber.

[0103] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0104] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0105] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0106] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0107] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 180°C.

[0108] In this example, the heating temperature in step 1 is 165°C, and the heating temperature of the basalt aggregate in step 2 is 190°C.

[0109] In this example, the dry mixing speed in step 3 is 80 rpm and the dry mixing time is 10 min.

[0110] In this example, the high-viscoelastic SBS modified asphalt in step 4 is added and mixed in a molten state, and the preparation method is as follows:

[0111] First, the finished SBS modified asphalt is heated to 190°C, and a high-viscoelastic modifier is added into an oil bath pot and stirred for 45 minutes to produce a high-viscoelastic SBS modified asphalt.

[0112] In this example, the dosage of the high viscoelastic modifier is 10%.

[0113] The preparation method of the high viscoelastic modifier in this example is:

[0114] S1: Add 0.6 kg of bismaleimidodiphenylmethane and 8 kg of amino-terminated nitrile liquid rubber to 300 kg of toluene, introduce nitrogen, add 9 kg of organic base, the reaction temperature is 75°C, stir and react for 2 hours, then add 18 kg of cerium methacrylate, stir and react for 3 hours;

[0115] S2: Add 5kg of benzoyl peroxide, 60kg of C9 petroleum resin, and 0.2kg of allyl zinc bromide, and continue stirring and reacting for 5h; evaporate the toluene under reduced pressure to obtain a high viscoelastic modifier.

[0116] The organic base is selected from diethylmethylamine.

[0117] The amine-terminated nitrile liquid rubber is a commercially available product selected from Hycar-ATBN amine-terminated nitrile liquid rubber.

[0118] Comparative Example 1

[0119] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0120] Basalt coarse aggregate 315kg

[0121] Basalt fine aggregate 225kg

[0122] Limestone fine aggregate 105kg

[0123] Recycled basalt coarse aggregate 200kg

[0124] Limestone powder 85kg

[0125] SBS modified asphalt 50kg

[0126] 1kg of lignin fiber.

[0127] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0128] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0129] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0130] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0131] Step 4: Add SBS modified asphalt and mix and stir. The discharge temperature is 170°C.

[0132] In this example, the heating temperature in step 1 is 150°C, and the heating temperature of the basalt aggregate in step 2 is 180°C.

[0133] In this example, the dry mixing speed in step 3 is 50 rpm and the dry mixing time is 30 min.

[0134] In this example, in step 4, the SBS modified asphalt is added and mixed in a molten state at 170°C.

[0135] Comparative Example 2

[0136] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0137] Basalt coarse aggregate 315kg

[0138] Basalt fine aggregate 225kg

[0139] Limestone fine aggregate 105kg

[0140] Recycled basalt coarse aggregate 200kg

[0141] Limestone powder 85kg

[0142] High Viscoelastic SBS Modified Asphalt 50kg

[0143] 1kg of lignin fiber.

[0144] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0145] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0146] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0147] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0148] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 170°C.

[0149] In this example, the heating temperature in step 1 is 150°C, and the heating temperature of the basalt aggregate in step 2 is 180°C.

[0150] In this example, the dry mixing speed in step 3 is 50 rpm and the dry mixing time is 30 min.

[0151] In this example, the high-viscoelastic SBS modified asphalt in step 4 is added and mixed in a molten state, and the preparation method is as follows:

[0152] First, the finished SBS modified asphalt is heated to 170°C, and a high-viscoelastic modifier is added into an oil bath pot and stirred for 75 minutes to produce a high-viscoelastic SBS modified asphalt.

[0153] In this example, the dosage of the high-viscoelastic modifier is 5%.

[0154] The preparation method of the high viscoelastic modifier in this example is:

[0155] S1: Add 3 kg of amino-terminated nitrile liquid rubber to 200 kg of toluene, introduce nitrogen, add 5 kg of organic base, set the reaction temperature to 60°C, stir and react for 0.5 h, then add 10 kg of cerium methacrylate, stir and react for 1 h;

[0156] S2: Add 2kg of benzoyl peroxide, 40kg of C9 petroleum resin, and 0.03kg of allyl zinc bromide, and continue stirring and reacting for 2h; evaporate the toluene under reduced pressure to obtain a high viscoelastic modifier.

[0157] The organic base is selected from triethylamine.

[0158] The amine-terminated nitrile liquid rubber is a commercially available product selected from Hycar-ATBN amine-terminated nitrile liquid rubber.

[0159] Comparative Example 3

[0160] A recycled basalt asphalt mixture comprises the following components in parts by weight:

[0161] Basalt coarse aggregate 315kg

[0162] Basalt fine aggregate 225kg

[0163] Limestone fine aggregate 105kg

[0164] Recycled basalt coarse aggregate 200kg

[0165] Limestone powder 85kg

[0166] High Viscoelastic SBS Modified Asphalt 50kg

[0167] 1kg of lignin fiber.

[0168] A method for preparing a recycled basalt asphalt mixture, characterized in that it comprises the following steps:

[0169] Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10 to 15 mm size portion and heated by a regenerated drying drum;

[0170] Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials;

[0171] Step 3: Add limestone powder and lignin fiber for dry mixing;

[0172] Step 4: Add high-viscosity SBS modified asphalt and mix and stir. The discharge temperature is 170°C.

[0173] In this example, the heating temperature in step 1 is 150°C, and the heating temperature of the basalt aggregate in step 2 is 180°C.

[0174] In this example, the dry mixing speed in step 3 is 50 rpm and the dry mixing time is 30 min.

[0175] In this example, the high-viscoelastic SBS modified asphalt in step 4 is added and mixed in a molten state, and the preparation method is as follows:

[0176] First, the finished SBS modified asphalt is heated to 170°C, and a high-viscoelastic modifier is added into an oil bath pot and stirred for 75 minutes to produce a high-viscoelastic SBS modified asphalt.

[0177] In this example, the dosage of the high-viscoelastic modifier is 5%.

[0178] The preparation method of the high viscoelastic modifier in this example is:

[0179] S1: Add 0.1 kg of bismaleimidodiphenylmethane and 3 kg of amino-terminated nitrile liquid rubber to 200 kg of toluene, introduce nitrogen, add 5 kg of organic base, the reaction temperature is 60°C, stir and react for 0.5 h, then add 10 kg of cerium methacrylate, stir and react for 1 h;

[0180] S2: Add 2kg of benzoyl peroxide and 40kg of C9 petroleum resin, continue stirring and reacting for 2h; evaporate toluene under reduced pressure to obtain a high viscoelastic modifier.

[0181] The organic base is selected from triethylamine.

[0182] The amine-terminated nitrile liquid rubber is a commercially available product selected from Hycar-ATBN amine-terminated nitrile liquid rubber.

[0183] The test methods for the residual stability of water immersion, freeze-thaw splitting strength ratio and dynamic stability of the recycled basalt asphalt mixture prepared in the above examples and comparative examples are as follows:

[0184] Asphalt mixture specimens for measuring the water stability of the mixture are made according to the test method T 0702-2011 in the "Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011). After the specimens are formed, the specimens are demoulded, kept warm and tested for stability. The above series of operations are carried out according to the test method T 0709-2011 in the "Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011). Asphalt mixture specimens for the high temperature stability of asphalt mixtures are made according to the test method T 0703-2011. After the specimens are formed, the dynamic stability is tested according to the test method T 0719-2011.

[0185] (1) Water immersion residual stability

[0186] According to the measured stability values ​​of the test pieces, the average value is obtained and the residual stability after immersion in water is calculated:

[0187]

[0188] Where: MS 0 —Residual stability of specimen after immersion in water (%);

[0189] MS 1 —Stability of the specimen after immersion in water for 48 hours (kN);

[0190] MS—specimen stability (kN).

[0191] (2) Freeze-thaw splitting strength

[0192]

[0193] Where: TSR—freeze-thaw splitting test strength ratio (%);

[0194] —Average splitting tensile strength of the second group of valid specimens after freeze-thaw cycles (MPa);

[0195] —Average splitting tensile strength of the first group of valid specimens without freeze-thaw cycles (MPa).

[0196] (3) Dynamic stability test

[0197]

[0198] Where: DS is the dynamic stability of the sample specimen;

[0199] d 1 is the deformation corresponding to the sample specimen t1;

[0200] d 2 is the deformation corresponding to the sample specimen t1;

[0201] C 1 The correction factor for the testing machine type is 1.0 for the crank-connecting rod driven specimen variable speed travel mode;

[0202] C 2 is the sample specimen coefficient, and the sample specimen with a width of 300 mm prepared in the laboratory is 1.0;

[0203] N is the reciprocating rolling speed of the test wheel, usually 42 times / min.

[0204] The test results are as follows:

[0205]

[0206] The present invention is intended to cover all alternatives, modifications and equivalent technical solutions, which are included within the scope of the present invention as defined in the claims. It should be recognized by those skilled in the art that many methods and materials similar or equivalent to those described herein can be used to practice the present invention. The present invention is in no way limited to the methods and materials described herein. In the event that one or more of the combined documents, patents and similar materials differ from or contradict the present application (including but not limited to defined terms, term applications, described technologies, etc.), the present application shall prevail.

[0207] It will be further appreciated that certain features of the invention, which for clarity are described in the context of multiple separate embodiments, may also be provided in combination in a single embodiment, and conversely, various features of the invention, which for brevity are described in the context of a single embodiment, may also be provided separately or in any suitable subcombination.

[0208] Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. All patents and publications to which the present invention relates are incorporated herein by reference in their entirety.

[0209] The term “comprise” or “include” is an open expression, that is, including the contents specified in the present invention but not excluding other contents.

Claims

1. A method for preparing a recycled basalt asphalt mixture, comprising the following components in parts by weight: Basalt coarse aggregate 315-335 parts Basalt fine aggregate 205-225 parts Limestone fine aggregate 105-120 parts Recycled basalt coarse aggregate 180-200 parts Limestone powder 85-100 parts High-viscosity SBS modified asphalt 50-60 parts 1-5 parts of lignin fiber; The following steps are involved: Step 1: The regenerated basalt crushed coarse aggregate is screened to take the 10-15mm size part and heated by the regeneration drying drum; Step 2: After heating to a certain temperature, basalt aggregate and limestone fine aggregate are mixed with recycled materials; Step 3: Add limestone powder and lignin fiber for dry mixing; Step 4: Add high-viscosity elastic SBS modified asphalt and mix and stir, the discharge temperature is 170-180° C. In step 4, the high-viscosity elastic SBS modified asphalt is added and mixed in a molten state. The preparation method of the high-viscosity elastic SBS modified asphalt is as follows: First, heat the finished SBS modified asphalt to 170-190℃, add the high-viscoelastic modifier into the oil bath, and stir for 40-100 minutes to make the high-viscoelastic SBS modified asphalt; The preparation method of the high viscoelastic modifier: S1: Add 0.05-0.6 parts of bismaleimidodiphenylmethane and 3-8 parts of amine-terminated nitrile liquid rubber to 200-300 parts of toluene, introduce nitrogen, add 5-9 parts of organic base, the reaction temperature is 60-75°C, stir and react for 0.5-2h, then add 10-18 parts of cerium methacrylate, stir and react for 1-3h; S2: Add 2-5 parts of benzoyl peroxide, 40-60 parts of C9 petroleum resin, and 0.03-0.2 parts of allyl zinc bromide, and continue to stir and react for 2-5 hours; evaporate toluene under reduced pressure to obtain a high viscoelastic modifier; The particle size of the basalt coarse aggregate is 2.36-13.2 mm.

2. The method for preparing a recycled basalt asphalt mixture according to claim 1, characterized in that: The particle sizes of the basalt fine aggregate and the limestone fine aggregate are 0.075-2.36 mm, and the particle size of the limestone ore powder is less than 0.075 mm.

3. The method for preparing a recycled basalt asphalt mixture according to claim 1, characterized in that: The particle sizes of the basalt coarse aggregate are 2.36 mm, 4.75 mm, 9.5 mm and 13.2 mm. The weight of the basalt coarse aggregate with a particle size of 2.36 mm accounts for 14% to 20% of the total weight of the basalt aggregate, the weight of the basalt coarse aggregate with a particle size of 4.75 mm accounts for 19% to 32% of the total weight of the basalt aggregate, the weight of the basalt coarse aggregate with a particle size of 9.5 mm accounts for 16% to 24% of the total weight of the basalt aggregate, and the weight of the basalt coarse aggregate with a particle size of 13.2 mm accounts for 0% to 10% of the total weight of the basalt aggregate.

4. The method for preparing a recycled basalt asphalt mixture according to claim 1, characterized in that: The particle sizes of the basalt fine aggregate are 0.075mm, 0.15mm, 0.3mm, 0.6mm and 1.18mm. The weight of the basalt fine aggregate with a particle size of 0.075mm accounts for 1% to 7% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.15mm accounts for 2% to 5% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.3mm accounts for 3% to 9% of the total weight of the basalt aggregate, the weight of the basalt fine aggregate with a particle size of 0.6mm accounts for 5% to 11% of the total weight of the basalt aggregate, and the weight of the basalt fine aggregate with a particle size of 1.18mm accounts for 9% to 13% of the total weight of the basalt aggregate.

5. The method for preparing a recycled basalt asphalt mixture according to claim 1, characterized in that: The heating temperature in step 1 is 150-165°C, and the heating temperature of the basalt aggregate in step 2 is 180-190°C.

6. The method for preparing a recycled basalt asphalt mixture according to claim 1, characterized in that: In step 3, the dry mixing speed is 50-80 rpm, and the dry mixing time is 10-30 min.

7. The method for preparing a recycled basalt asphalt mixture according to claim 1, It is characterized in that The dosage of the high-viscoelastic modifier is 5-10%.

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