Basalt roadbed material in alpine region, preparation method of basalt roadbed material and roadbed base construction method

Abstract

The invention relates to the technical field of road bases, in particular to a basalt roadbed material for alpine regions, a preparation method of the basalt roadbed material and a roadbed base construction method, and the basalt roadbed material comprises the following components in parts by weight: 100 parts of basalt macadam and 12-20 parts of high-strength low-temperature-resistant unsaturated polyester resin. Wherein the high-strength low-temperature-resistant unsaturated polyester resin is prepared from the following raw materials in parts by weight: 5 to 10 parts of phthalic anhydride, 20 to 32 parts of methylpropanediol, 24 to 28 parts of maleic anhydride, 25 to 30 parts of styrene, 25 to 30 parts of itaconic acid, 0.5 to 2.5 parts of peroxybenzoic acid, 0.02 to 0.06 part of methylhydroquinone, 1 to 2 parts of basalt fiber and 1 to 5 parts of hollow microspheres. The basalt roadbed material provided by the invention has relatively good cold resistance and stability in a low-temperature environment, is not easy to crack, and has a wide application prospect in the roadbed field.

Description

Technical Field

[0001] The invention relates to the technical field of road base, and in particular to a basalt roadbed material in a high-cold area, a preparation method thereof, and a roadbed base construction method. Background Art

[0002] With the rapid development of my country's transportation modernization, highway construction has achieved remarkable achievements. Roadbed materials are the main components of the road base, and they play an important role in load transfer and dispersion. Common roadbed materials include soil, sand and gravel. As one of the main materials for roadbed construction, gravel has the characteristics of hardness, wear resistance, and compression resistance. In roadbed engineering, there are many types of crushed stones, and the common ones are limestone crushed stone, granite crushed stone, etc. Different types of crushed stones have different applications in roadbed construction due to differences in composition, structure, physical and mechanical properties, etc. Commonly used crushed stones include limestone, amphibolite, porphyry, quartzite, granite, etc., but they have poor weathering and corrosion resistance.

[0003] Basalt is a stone with a dense texture and good compressive resistance. Its color is generally black or dark green, and its density is generally 2.9-3.3g / cm 3 , compressive strength 100-300MPa, with excellent durability and weathering resistance, can remain stable for a long time in harsh natural environment. Basalt has superior strength, low draft, and bearing capacity. In the long-term use process, it shows lower crushing value and higher corrosion resistance.

[0004] The construction method of traditional gravel roadbed base generally uses sulphoaluminate cement inorganic gelling material. Due to the influence of low temperature factors, cement inorganic gelling material is prone to cause severe shrinkage of concrete and cracks, and has poor stability. Therefore, it is of great significance to study a basalt roadbed material with good cold resistance, stability and low cracking in low temperature environment. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a basalt roadbed material for high-altitude cold areas, a preparation method thereof, and a roadbed base construction method. The basalt roadbed material provided by the present invention has good cold resistance and stability in a low temperature environment and is not prone to cracks, and has broad application prospects in the roadbed field.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a basalt roadbed material for alpine regions, the basalt roadbed material comprising the following components in parts by weight: 100 parts of basalt crushed stone, 12-20 parts of high-strength and low-temperature-resistant unsaturated polyester resin;

[0008] The high-strength and low-temperature-resistant unsaturated polyester resin is made of the following raw materials in parts by weight:

[0009]

[0010] The basalt roadbed material provided by the present invention has good cold resistance and stability in a low-temperature environment and is not prone to cracks, and has broad application prospects in the roadbed field.

[0011] Furthermore, the raw materials for preparing the high-strength and low-temperature-resistant unsaturated polyester resin also include polypropylene fibers, and the mass ratio of the polypropylene fibers to the basalt fibers is (4-5):1.

[0012] Furthermore, the basalt gravel includes the following components of different particle sizes, measured by weight: 22-28 parts of gravel not less than 19 mm and not more than 31.5 mm, 25-31 parts of gravel less than 19 mm and not less than 9.5 mm, 12-18 parts of gravel less than 9.5 mm and not less than 4.75 mm, and 28-35 parts of gravel less than 4.75 mm, wherein the sum of the weight parts of each component is 100.

[0013] Furthermore, the preparation method of the high-strength and low-temperature-resistant unsaturated polyester resin comprises the following steps:

[0014] S1: In a reaction kettle equipped with a stirrer, a condensing device, and a temperature measuring device, under nitrogen protection, add the phthalic anhydride and methyl propylene glycol, raise the temperature to 60-80° C., perform a first stirring, then add maleic anhydride, and then raise the temperature to 130-150° C., perform a second stirring reaction, and obtain S1 reactant;

[0015] S2: adding the styrene and itaconic acid into a dilution kettle to prepare a dilution solution;

[0016] S3: adding the S1 reactant obtained in step S1 to the diluted solution obtained in step S2, heating the mixture to 130-140° C. to continue the reaction, and cooling the mixture to room temperature after the reaction is completed to obtain an unsaturated polyester resin composition;

[0017] S4: adding the basalt fiber, polypropylene fiber, and hollow microspheres to the unsaturated polyester resin composition, stirring evenly, and then adding the benzoic acid peroxide and methylhydroquinone, and performing a third stirring to obtain the high-strength and low-temperature-resistant unsaturated polyester resin.

[0018] Furthermore, in step S1, the first stirring time is 20 to 40 minutes, and the second stirring reaction time is 1 to 2 hours.

[0019] Furthermore, in step S3, the reaction time is 0.5-1h.

[0020] Furthermore, in step S4, the third stirring time is 10-20 minutes.

[0021] In a second aspect, the present invention provides a method for preparing the alpine basalt roadbed material as described in the first aspect, the preparation method comprising the following steps:

[0022] Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

[0023] In a third aspect, the present invention provides a construction method for a basalt roadbed base in a high-cold region, the construction method comprising the following steps:

[0024] A1. Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation;

[0025] A2: The alpine basalt roadbed material described in the first aspect or the alpine basalt roadbed material prepared by the preparation method described in the second aspect is transported to the construction site for layered filling. After each layer is filled, it is first reciprocated and leveled by a 18t-25t roller, and then compacted by a heavy hammer to finally obtain a basalt roadbed base.

[0026] Further, in step A2, the number of layers is 3 to 4, and the thickness of each layer is 0.2 to 0.4 m;

[0027] And / or, in step A2, the thickness of the basalt roadbed base layer is 0.6-1.6 m.

[0028] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0029] (1) The basalt roadbed material provided by the present invention has good cold resistance, stability and is not prone to cracks in low temperature environments, and has broad application prospects in the roadbed field.

[0030] (2) The roadbed material provided by the present invention can not only be quickly constructed in high-altitude and cold areas, but also has high strength, small deformation, high water stability, corrosion resistance, and low wetting coefficient.

[0031] (3) The present invention uses basalt crushed stone, which has excellent durability and weathering resistance and can remain stable for a long time in harsh natural environments. In addition, basalt has superior strength, low draft, and bearing capacity. During long-term use, it shows a lower crushing value and higher corrosion resistance.

[0032] (4) The high-strength and low-temperature-resistant unsaturated polyester resin used in the present invention exhibits stable performance during transportation and in low-temperature environments, is not easy to deteriorate, and can also adapt to low-temperature and high-cold environments during the mixing and molding and curing process with basalt crushed stone aggregates. The curing speed is relatively fast, and the required strength can be achieved after 2-4 hours of curing, completing the construction. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0034] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0035] In a first aspect, the present invention provides a basalt roadbed material for alpine regions, the basalt roadbed material comprising the following components in parts by weight: 100 parts of basalt crushed stone, 12-20 parts of high-strength and low-temperature-resistant unsaturated polyester resin (for example, 12 parts, 14 parts, 16 parts, 18 parts or 20 parts);

[0036] The high-strength and low-temperature-resistant unsaturated polyester resin is made of the following raw materials in parts by weight:

[0037]

[0038] The basalt roadbed material provided by the present invention has good cold resistance and stability in a low-temperature environment and is not prone to cracks, and has broad application prospects in the roadbed field.

[0039] In the above-mentioned basalt roadbed material for high-cold areas, as an optional implementation, the raw material for preparing the high-strength and low-temperature resistant unsaturated polyester resin also includes polypropylene fiber, and the mass ratio of the polypropylene fiber to the basalt fiber is (4-5):1.

[0040] In the above-mentioned alpine region basalt roadbed material, as an optional implementation mode, the basalt crushed stone includes the following components of different particle sizes, calculated by weight: 22-28 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 25-31 parts of crushed stone less than 19 mm and not less than 9.5 mm, 12-18 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 28-35 parts of crushed stone less than 4.75 mm, wherein the sum of the weight parts of each component is 100.

[0041] In the above-mentioned alpine region basalt roadbed material, as an optional implementation, the preparation method of the high-strength and low-temperature resistant unsaturated polyester resin comprises the following steps:

[0042] S1: In a reaction kettle equipped with a stirrer, a condensing device, and a temperature measuring device, under nitrogen protection, add the phthalic anhydride and methyl propylene glycol, raise the temperature to 60-80°C (for example, 60°C, 70°C, or 80°C), perform a first stirring, then add maleic anhydride, and then raise the temperature to 130-150°C (for example, 130°C, 140°C, or 150°C), perform a second stirring reaction, and obtain S1 reactant;

[0043] S2: adding the styrene and itaconic acid into a dilution kettle to prepare a dilution solution;

[0044] S3: adding the S1 reactant obtained in step S1 to the diluted solution obtained in step S2, heating the mixture to 130-140° C. to continue the reaction, and cooling the mixture to room temperature after the reaction is completed to obtain an unsaturated polyester resin composition;

[0045] S4: adding the basalt fiber, polypropylene fiber, and hollow microspheres to the unsaturated polyester resin composition, stirring evenly, and then adding the benzoic acid peroxide and methylhydroquinone, and performing a third stirring to obtain the high-strength and low-temperature-resistant unsaturated polyester resin.

[0046] In the above-mentioned alpine basalt roadbed material, as an optional implementation, in step S1, the first stirring time is 20 to 40 minutes (for example, it can be 20 minutes, 30 minutes, 40 minutes), and the second stirring reaction time is 1-2 hours.

[0047] In the above-mentioned alpine region basalt roadbed material, as an optional implementation manner, in step S3, the reaction time is 0.5-1h.

[0048] In the above-mentioned alpine region basalt roadbed material, as an optional implementation manner, in step S4, the third stirring time is 10-20 minutes.

[0049] In a second aspect, the present invention provides a method for preparing the alpine basalt roadbed material as described in the first aspect, the preparation method comprising the following steps:

[0050] Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

[0051] In a third aspect, the present invention provides a construction method for a basalt roadbed base in a high-cold region, the construction method comprising the following steps:

[0052] A1. Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation;

[0053] A2: The alpine basalt roadbed material described in the first aspect or the alpine basalt roadbed material prepared by the preparation method described in the second aspect is transported to the construction site for layered filling. After each layer is filled, it is first reciprocated and leveled by a 18t-25t roller, and then compacted by a heavy hammer to finally obtain a basalt roadbed base.

[0054] In the above-mentioned construction method of basalt roadbed base in alpine areas, as an optional implementation mode, in step A2, the number of layers is 3 to 4 layers, and the thickness of each layer (single layer) is 0.2 to 0.4 m.

[0055] In the above-mentioned construction method of basalt roadbed base in alpine areas, as an optional implementation mode, in step A2, the thickness of the basalt roadbed base is 0.6 to 1.6 m.

[0056] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0057] Examples 1-3

[0058] The present embodiment provides a basalt roadbed material for alpine regions, the basalt roadbed material comprising the following components in parts by weight: 100 parts of basalt crushed stone and 12-20 parts of high-strength and low-temperature-resistant unsaturated polyester resin, wherein the high-strength and low-temperature-resistant unsaturated polyester resin is made of the following raw materials in the following parts by weight ratio:

[0059] Phthalic anhydride 5-10 parts,

[0060]

[0061] The basalt crushed stone includes the following components of different particle sizes by weight: 22 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 30 parts of crushed stone less than 19 mm and not less than 9.5 mm, 15 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 33 parts of crushed stone less than 4.75 mm;

[0062] The preparation method of the high-strength and low-temperature-resistant unsaturated polyester resin comprises the following steps:

[0063] S1: In a reaction kettle equipped with a stirrer, a condensing device, and a temperature measuring device, under nitrogen protection, phthalic anhydride and methyl propylene glycol were added, the temperature was raised to 60°C, and stirred for 40 minutes, and then maleic anhydride was added, and the temperature was raised to 130°C, and stirred for reaction for 2 hours to obtain S1 reactant;

[0064] S2: Add styrene and itaconic acid into the dilution kettle to prepare a dilution solution;

[0065] S3: adding the S1 reactant obtained in step S1 to the diluted solution obtained in step S2, heating to 130° C. and continuing the reaction for 1 hour, cooling to room temperature after the reaction is completed, and obtaining an unsaturated polyester resin composition;

[0066] S4: adding basalt fiber, polypropylene fiber and hollow microspheres to the unsaturated polyester resin composition, stirring evenly, and then adding benzoic acid peroxide and methylhydroquinone, stirring for 15 minutes to obtain the high-strength and low-temperature-resistant unsaturated polyester resin.

[0067] The method for preparing the basalt roadbed material in the alpine region comprises the following steps:

[0068] Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

[0069] This embodiment also provides a construction method for a basalt roadbed base in a high-cold region, the construction method comprising the following steps:

[0070] A1 Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation;

[0071] A2. The alpine basalt roadbed material provided in this embodiment is transported to the construction site and filled in layers. The number of layers is 3, and the thickness of each layer (single layer) is 0.2m. After each layer is filled, it is first reciprocated and leveled by an 18t roller, and then compacted by a heavy hammer, and finally a basalt roadbed base with a thickness of 0.6m is obtained.

[0072] The specific values ​​of each component and its corresponding weight fraction in Examples 1-3 are shown in Table 1.

[0073] Table 1

[0074]

[0075] Example 4

[0076] This embodiment provides a basalt roadbed material for high-altitude cold areas. The basalt roadbed material is basically the same as that in Example 3, except that, by weight, the basalt crushed stone includes the following components of different particle sizes: 28 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 25 parts of crushed stone less than 19 mm and not less than 9.5 mm, 18 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 29 parts of crushed stone less than 4.75 mm.

[0077] The preparation method of the alpine basalt roadbed material is the same as that in Example 3, and specifically comprises the following steps:

[0078] Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

[0079] This embodiment also provides a construction method for a basalt roadbed base in a high-cold region, the construction method comprising the following steps:

[0080] A1 Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation;

[0081] A2: The alpine basalt roadbed material provided in this embodiment is transported to the construction site and filled in layers. The number of layers is 4, and the thickness of each layer (single layer) is 0.3m. After each layer is filled, it is first reciprocated and leveled by a 25t roller, and then compacted by a heavy hammer, and finally a basalt roadbed base with a thickness of 1.2m is obtained.

[0082] Example 5

[0083] This embodiment provides a basalt roadbed material for alpine areas. The basalt roadbed material is basically the same as that of Embodiment 3, except that the raw material of the high-strength and low-temperature-resistant unsaturated polyester resin does not include polypropylene fiber. The basalt roadbed material includes the following components in parts by weight: 100 parts of basalt crushed stone and 20 parts of high-strength and low-temperature-resistant unsaturated polyester resin, wherein the high-strength and low-temperature-resistant unsaturated polyester resin is made of the following raw materials in the following parts by weight:

[0084]

[0085]

[0086] The basalt crushed stone includes the following components of different particle sizes by weight: 22 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 30 parts of crushed stone less than 19 mm and not less than 9.5 mm, 15 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 33 parts of crushed stone less than 4.75 mm;

[0087] The preparation method of the high-strength and low-temperature-resistant unsaturated polyester resin comprises the following steps:

[0088] S1: In a reaction kettle equipped with a stirrer, a condensing device, and a temperature measuring device, under nitrogen protection, phthalic anhydride and methyl propylene glycol were added, the temperature was raised to 60°C, and stirred for 40 minutes, and then maleic anhydride was added, and the temperature was raised to 130°C, and stirred for reaction for 2 hours to obtain S1 reactant;

[0089] S2: Add styrene and itaconic acid into the dilution kettle to prepare a dilution solution;

[0090] S3: adding the S1 reactant obtained in step S1 to the diluted solution obtained in step S2, heating to 130° C. and continuing the reaction for 1 hour, cooling to room temperature after the reaction is completed, and obtaining an unsaturated polyester resin composition;

[0091] S4: adding basalt fiber, polypropylene fiber and hollow microspheres to the unsaturated polyester resin composition, stirring evenly, and then adding benzoic acid peroxide and methylhydroquinone, stirring for 15 minutes to obtain the high-strength and low-temperature-resistant unsaturated polyester resin.

[0092] The method for preparing the basalt roadbed material in the alpine region comprises the following steps:

[0093] Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

[0094] This embodiment also provides a construction method for a basalt roadbed base in a high-cold region, the construction method comprising the following steps:

[0095] A1 Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation;

[0096] A2: The alpine basalt roadbed material provided in this embodiment is transported to the construction site and filled in layers. The number of layers is 3, and the thickness of each layer (single layer) is 0.2m. After each layer is filled, it is first reciprocated and leveled by an 18t roller, and then compacted by a heavy hammer, and finally a basalt roadbed base with a thickness of 0.6m is obtained.

[0097] Comparative Example 1

[0098] The alpine region basalt roadbed material provided in this comparative example is basically the same as that in Example 3, except that the high-strength and low-temperature-resistant unsaturated polyester resin is replaced by epoxy resin.

[0099] The alpine region basalt roadbed material was prepared by referring to the preparation method provided in Example 3.

[0100] Comparative Example 2

[0101] The alpine basalt roadbed material provided in this comparative example is basically the same as that in Example 3, except that the raw material of the high-strength and low-temperature-resistant unsaturated polyester resin includes 12 parts of basalt fiber, but does not include polypropylene fiber.

[0102] A high-strength and low-temperature-resistant unsaturated polyester resin was prepared by referring to the preparation method provided in Example 3.

[0103] The alpine region basalt roadbed material was prepared by referring to the preparation method provided in Example 3.

[0104] Comparative Example 3

[0105] The alpine basalt roadbed material provided in this comparative example is basically the same as that in Example 3, except that the raw materials of the high-strength and low-temperature-resistant unsaturated polyester resin include 6 parts of basalt fiber and 6 parts of polypropylene fiber.

[0106] The high-strength and low-temperature-resistant unsaturated polyester resin was prepared by referring to the preparation method provided in Example 3.

[0107] The alpine region basalt roadbed material was prepared by referring to the preparation method provided in Example 3.

[0108] Comparative Example 4

[0109] The alpine basalt roadbed material provided in this comparative example is basically the same as that in Example 3, except that, by weight, the basalt crushed stone includes the following components of different particle sizes: 35 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 30 parts of crushed stone less than 19 mm and not less than 9.5 mm, 15 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 20 parts of crushed stone less than 4.75 mm.

[0110] The alpine region basalt roadbed material was prepared by referring to the preparation method provided in Example 3.

[0111] Comparative Example 5

[0112] The alpine basalt roadbed material provided in this comparative example is basically the same as that in Example 3, except that, by weight, the basalt crushed stone includes the following components of different particle sizes: 15 parts of crushed stone not less than 19 mm and not more than 31.5 mm, 30 parts of crushed stone less than 19 mm and not less than 9.5 mm, 15 parts of crushed stone less than 9.5 mm and not less than 4.75 mm, and 40 parts of crushed stone less than 4.75 mm.

[0113] The alpine region basalt roadbed material was prepared by referring to the preparation method provided in Example 3.

[0114] Performance Testing

[0115] Cold resistance and stability performance test

[0116] Test samples: The basalt roadbed materials for high-cold areas provided in Examples 1-5 were selected as test samples 1-5, and the basalt roadbed materials for high-cold areas provided in Comparative Examples 1-5 were selected as control samples 1-5.

[0117] Test method: 50 pieces of test samples 1-5 and control samples 1-5 were selected, and divided into 10 groups according to the corresponding samples, numbered 1-10. Each group of samples was laid flat in a cold storage at -45℃ for 3 months, and then the appearance of each group was observed and whether it was cracked or broken was recorded. After taking out and restoring to (25±2)℃, the compressive strength was tested respectively, and the average value was recorded.

[0118] Test results: The appearance and compressive strength of test samples 1-5 are shown in Table 2; the appearance and compressive strength of control samples 1-5 are shown in Table 3. As shown in Tables 2 and 3, after being placed in an environment of -45°C for 3 months, test samples 1-5 still maintain a complete appearance and excellent mechanical strength.

[0119] Table 2

[0120]

[0121] Table 3

[0122]

[0123] From Table 2 and Table 3, we can at least see the following points:

[0124] (1) It can be seen from the test sample 3 and the control sample 1 that when the high-strength and low-temperature resistant unsaturated polyester resin is replaced by epoxy resin, the appearance is more damaged, there are cracks, and the mechanical strength is greatly reduced.

[0125] (2) It can be seen from the test sample 3 and the control sample 2-3 that when the fibers include basalt fibers and polypropylene fibers and the mass ratio of polypropylene fibers to basalt fibers is (4-5):1, the mechanical strength is optimal.

[0126] (3) It can be seen from the test sample 3 and the control samples 4-5 that when there are too many or too few gravels less than 4.75 mm, the appearance is severely damaged, there are many cracks, and the mechanical strength is greatly reduced.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A basalt roadbed material for alpine areas, characterized in that: The basalt roadbed material comprises the following components in parts by weight: 100 parts of basalt crushed stone and 12-20 parts of high-strength and low-temperature-resistant unsaturated polyester resin; The high-strength and low-temperature-resistant unsaturated polyester resin is made of the following raw materials in parts by weight:

2. The alpine basalt roadbed material according to claim 1, characterized in that: The raw materials for preparing the high-strength and low-temperature-resistant unsaturated polyester resin also include polypropylene fibers, and the mass ratio of the polypropylene fibers to the basalt fibers is (4-5):

1.

3. The alpine basalt roadbed material according to claim 1, characterized in that: In terms of weight, the basalt gravel includes the following components of different particle sizes: 22-28 parts of gravel not less than 19 mm and not more than 31.5 mm, 25-31 parts of gravel less than 19 mm and not less than 9.5 mm, 12-18 parts of gravel less than 9.5 mm and not less than 4.75 mm, and 28-35 parts of gravel less than 4.75 mm, wherein the sum of the weight parts of each component is 100.

4. The alpine basalt roadbed material according to claim 1, characterized in that: The preparation method of the high-strength and low-temperature-resistant unsaturated polyester resin comprises the following steps: S1: In a reaction kettle equipped with a stirrer, a condensing device, and a temperature measuring device, under nitrogen protection, add the phthalic anhydride and methyl propylene glycol, raise the temperature to 60-80° C., perform a first stirring, then add maleic anhydride, and then raise the temperature to 130-150° C., perform a second stirring reaction, and obtain S1 reactant; S2: adding the styrene and itaconic acid into a dilution kettle to prepare a dilution solution; S3: adding the S1 reactant obtained in step S1 to the diluted solution obtained in step S2, heating the mixture to 130-140° C. to continue the reaction, and cooling the mixture to room temperature after the reaction is completed to obtain an unsaturated polyester resin composition; S4: adding the basalt fiber, polypropylene fiber, and hollow microspheres to the unsaturated polyester resin composition, stirring evenly, and then adding the benzoic acid peroxide and methylhydroquinone, and performing a third stirring to obtain the high-strength and low-temperature-resistant unsaturated polyester resin.

5. The alpine basalt roadbed material according to claim 1, characterized in that: In step S1, the first stirring time is 20 to 40 minutes, and the second stirring reaction time is 1 to 2 hours.

6. The alpine basalt roadbed material according to claim 1, characterized in that: In step S3, the reaction time is 0.5-1 h.

7. The alpine basalt roadbed material according to claim 1, characterized in that: In step S4, the third stirring time is 10-20 minutes.

8. A method for preparing basalt roadbed materials in high-cold areas according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: Basalt crushed stones with different particle size ratios are placed in a mixer and stirred evenly, and then the high-strength and low-temperature-resistant unsaturated polyester resin is added, and after being dispersed and stirred evenly, the alpine region basalt roadbed material is obtained.

9. A construction method for basalt roadbed base in alpine areas, characterized in that: The construction method comprises the following steps: A1. Soil foundation surface treatment: remove the debris on the soil foundation surface and level it, then tamp the soil foundation; A2. The alpine basalt roadbed material according to any one of claims 1 to 7 or the alpine basalt roadbed material prepared by the preparation method according to claim 8 is transported to the construction site for layered filling. After each layer is filled, it is first reciprocated and leveled by a 18t-25t roller, and then compacted by a heavy hammer to finally obtain a basalt roadbed base.

10. The construction method of basalt roadbed base in alpine areas according to claim 9, characterized in that: In step A2, the number of layers is 3 to 4, and the thickness of each layer is 0.2 to 0.4 m; And / or, in step A2, the thickness of the basalt roadbed base layer is 0.6-1.6 m.

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