Basalt roadbed material, basalt roadbed and construction method thereof

Abstract

The invention provides a basalt roadbed material, a basalt roadbed and a construction method of the basalt roadbed, and belongs to the technical field of road bases. The basalt roadbed material is mainly prepared from basalt macadam, modified basalt fiber, epoxy resin, a curing agent and other raw materials with different particle size ratios according to a specific ratio. Through cooperation of the raw materials, the roadbed material is high in compressive strength, good in crack resistance, strong in water resistance and saline-alkaline resistance, and good in chemical corrosion resistance and freeze thawing resistance, so that the formed basalt roadbed has excellent bearing capacity, stability and durability. The invention further provides a construction method of the basalt roadbed, and the construction method can ensure that roadbed materials are mixed and reacted according to an expected direction, so that better performance is obtained, and the stability, high strength and durability of the roadbed are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of road base, and relates to a basalt roadbed material, a basalt roadbed and a construction method thereof. 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 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 gravel. Different types of gravel have different applications in roadbed construction due to differences in composition, structure, physical and mechanical properties, etc. Common ones include limestone gravel, granite gravel, etc. Although gravel can make the formed roadbed have a certain compressive resistance, with the increase of actual use demand, the compressive resistance of the roadbed needs to be further improved. At the same time, the above-mentioned gravel has poor weathering and corrosion resistance, resulting in insufficient bearing capacity and durability of the roadbed, and is prone to sinking, deformation, cracking and other hazards.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In view of the shortcomings and defects of the prior art, the present invention aims to provide a basalt roadbed material, a basalt roadbed and a construction method thereof.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] The first object of the present invention is to provide a basalt roadbed material, comprising the following raw materials in parts by weight:

[0007] 100 parts of basalt crushed stone with different particle sizes, 0.5-2 parts of modified basalt fiber, 8-15 parts of resin and 0.5-1 part of curing agent.

[0008] Furthermore, based on the above technical solution of the present invention, basalt gravel with different particle size ratios includes: 20-30 parts of 20-30mm basalt gravel, 20-30 parts of 10-20mm basalt gravel, 15-20 parts of 5-10mm basalt gravel and 20-30 parts of <5mm basalt gravel.

[0009] Furthermore, based on the above technical solution of the present invention, the modified basalt fiber is obtained by modifying chopped basalt fiber with a superhydrophobic modifier.

[0010] Further, on the basis of the above technical solution of the present invention, the super hydrophobic modifier includes one or at least two of aluminate coupling agent, silane coupling agent, titanate coupling agent, stearic acid or maleic anhydride;

[0011] And / or, the chopped basalt fibers have a diameter of 5-25 μm and a length of 3-25 mm;

[0012] And / or, the weight ratio of the chopped basalt fibers to the superhydrophobic modifier is 100:(0.1-3).

[0013] Further, on the basis of the above technical solution of the present invention, the preparation method of the modified basalt fiber comprises the following steps: mixing and modifying the short chopped basalt fiber with a super hydrophobic modifier to obtain the modified basalt fiber;

[0014] Preferably, the mixing and modification temperature is 20-30° C., and the mixing and modification time is 5-30 min.

[0015] Further, based on the above technical solution of the present invention, the resin includes at least one of epoxy resin, polyurethane resin or unsaturated polyester resin, preferably epoxy resin;

[0016] And / or, the curing agent includes at least one of polyamides, aliphatic amines, alicyclic amines, modified polyamines or polythiols.

[0017] The second object of the present invention is to provide a basalt roadbed, which is formed by filling the basalt roadbed material of the first object of the present invention.

[0018] The third object of the present invention is to provide a construction method of basalt roadbed, comprising the following steps:

[0019] S1. Mix basalt crushed stone, resin, curing agent and modified basalt fiber of different particle size ratios to form a basalt roadbed material;

[0020] S2. Fill the basalt roadbed materials in layers on the pre-treated soil surface to form a basalt roadbed.

[0021] Furthermore, based on the above technical solution of the present invention, in step S1, basalt crushed stones with different particle size ratios are mixed evenly, and then resin is added. After being dispersed and mixed evenly, curing agent and modified basalt fiber are added and further mixed evenly to form basalt roadbed material.

[0022] Further, on the basis of the above technical solution of the present invention, in step S2, the pretreatment step includes the steps of removing debris on the surface of the soil base to be treated, leveling the soil base and then compacting it;

[0023] And / or, in step S2, during the layered filling process, after each layer is filled, it is first reciprocated and leveled, then compacted by a heavy hammer, and then the next layer is filled; preferably, a 18t-25t roller is used for reciprocating rolling and leveling;

[0024] And / or, in step S2, the number of layers of layered filling is 3 to 5 layers, and the thickness of each single layer is 0.2 to 0.3 m;

[0025] And / or, in step S2, the thickness of the formed basalt roadbed is 0.6-1.5 m.

[0026] Compared with the prior art, the technical solution of the present invention has at least the following technical effects:

[0027] (1) The present invention provides a basalt roadbed material, which is mainly made of basalt crushed stone with different particle size ratios, modified basalt fiber, epoxy resin and curing agent through a specific ratio; through the coordination of the above raw materials, the roadbed material has high compressive strength, good crack resistance, strong water and salt resistance, good chemical corrosion resistance and freeze-thaw resistance, so that the formed basalt roadbed has excellent bearing capacity, stability and durability.

[0028] (2) The present invention provides a basalt roadbed, which is made of the basalt roadbed material provided by the present invention. In view of the advantages of the above basalt roadbed material, the formed basalt roadbed has excellent bearing capacity, stability and durability.

[0029] (3) The present invention provides a basalt roadbed construction method, which can ensure that the roadbed materials are mixed and reacted in a desired direction, thereby obtaining better performance and ensuring that the roadbed is stable, high-strength and durable. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] According to a first aspect of the present invention, a basalt roadbed material is provided, comprising the following raw materials in parts by weight:

[0033] 100 parts of basalt crushed stone with different particle sizes, 0.5-2 parts of modified basalt fiber, 8-15 parts of resin and 0.5-1 part of curing agent.

[0034] 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. Therefore, the basalt crushed stone made of it has excellent durability and weathering resistance, can remain stable for a long time in harsh natural environments, and also has superior strength, low draft, and bearing capacity. In the long-term use process, it shows a low crushing value and high corrosion resistance. At the same time, basalt crushed stone with different particle size ratios is used for grading, which can increase the density of the roadbed material, bear pressure, disperse the load, reduce deformation, and ensure good drainage performance, thereby improving the bearing capacity and stability of the roadbed.

[0035] In addition to using basalt crushed stone with different particle size ratios as aggregate, modified basalt fiber is also used in combination with it. Modified basalt fiber has good tensile strength and corrosion resistance, which can reduce the risk of cracking, improve the bearing capacity of the roadbed, and inhibit the settlement and deformation of the roadbed. At the same time, the amount of modified basalt fiber is also related to the strength, toughness and stress distribution of the roadbed material. If the amount of modified basalt fiber is too low (less than 0.5 parts), the performance improvement will be small. If the amount of modified basalt fiber is too high (more than 2 parts), it will cause a "pellet effect", forming a weak area, which reduces the material reinforcement effect, so there is a certain limit on its amount. The typical but non-restrictive amount of modified basalt fiber is 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts or 2 parts, etc.

[0036] The resin in the present invention can be selected from epoxy resin, polyurethane resin, unsaturated polyester resin, vinyl ester resin, etc. Such resins have the characteristics of good adhesion, high mechanical strength, strong corrosion resistance, and low curing shrinkage, and are used as a binder for roadbed materials in the present invention. Typical but non-limiting weight parts of the resin are 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts.

[0037] The curing agent is mainly used to react with the resin to form a cured product with a three-dimensional network structure. The typical but non-limiting weight portion of the curing agent is 0.5 part, 0.6 part, 0.8 part or 1 part, etc.

[0038] The present invention provides a basalt roadbed material, which is mainly made of raw materials such as basalt crushed stone with different particle size ratios, modified basalt fiber, resin and curing agent. Among them, the basalt crushed stone mainly bears the role of the main force structure, and has the characteristics of high strength and low crushing value; the resin firmly bonds the basalt crushed stone and the modified basalt fiber together to form a whole, and at the same time, the resin improves the corrosion resistance and deformation resistance of the roadbed material by wrapping the aggregate (crushed stone and fiber); the modified basalt fiber is evenly distributed in the roadbed material, and due to the reinforcement effect of the modified basalt fiber, a uniform random support system is formed in the roadbed body. When external force acts, on the one hand, it is transmitted through the overall roadbed material in the direction of force, and on the other hand, the fiber network allows more roadbed particles to participate in the force through spatial constraints. A single fiber bears part of the tensile stress of the shear deformation of the unit soil body, increasing the strength and toughness of the material. The present invention combines basalt crushed stone, modified basalt fiber and resin to make the roadbed material have high compressive strength, good crack resistance, strong water and salt resistance, chemical corrosion resistance and good freeze-thaw resistance, so that the formed basalt roadbed has excellent bearing capacity, stability and durability.

[0039] It should be noted that the basalt roadbed material can be directly laid on a flat and compacted soil base surface, or can be made into paving tiles in the form of prefabricated parts and laid on a flat and compacted soil base surface.

[0040] As an optional implementation of the technical solution of the present invention, basalt crushed stones with different particle size ratios include: 20-25 parts of 20-30mm basalt crushed stones, 20-30 parts of 10-20mm basalt crushed stones, 15-20 parts of 5-10mm basalt crushed stones and 20-30 parts of <5mm basalt crushed stones.

[0041] Specifically, the typical but non-limiting weight proportion of 20-30 mm basalt crushed stone is 20, 21, 22, 23, 24 or 25, etc.; the typical but non-limiting weight proportion of 10-20 mm basalt crushed stone is 20, 22, 24, 25, 26, 28 or 30, etc.; the typical but non-limiting weight proportion of 5-10 mm basalt crushed stone is 15, 16, 17, 18, 19 or 20, etc.; the typical but non-limiting weight proportion of <5 mm basalt crushed stone is 20, 22, 24, 25, 26, 28 or 30, etc. If the relative amount of basalt crushed stone with different particle size ratios exceeds the above-mentioned limited numerical range, it will have an adverse effect on the compressive properties of the roadbed material.

[0042] By further limiting the particle size and relative amount of basalt gravel, the particle size of basalt gravel can cover a range from large to small, ensuring continuous distribution of particle size and more reasonable grading. Small-size basalt gravel can fill the gaps between large-size basalt gravel, which is beneficial to further improve the density of roadbed materials and enhance the stability, bearing capacity and durability of the roadbed.

[0043] Since basalt fiber has a smooth surface, high inertness, and poor compatibility and adhesion with resin, it is modified. As an optional implementation of the technical solution of the present invention, the modified basalt fiber is obtained by modifying short chopped basalt fiber with a super hydrophobic modifier.

[0044] After being modified with a superhydrophobic modifier, the modified basalt fiber has better compatibility and adhesion with epoxy resin, which is beneficial to the dispersion of the modified basalt fiber and the performance of its performance.

[0045] As an optional implementation of the technical solution of the present invention, the super-hydrophobic modifier includes one of an aluminate coupling agent, a silane coupling agent, a titanate coupling agent, stearic acid or maleic anhydride, or a combination of at least two or more thereof.

[0046] Common brands of aluminate coupling agents include but are not limited to DL-411, DL-411AF, etc. Common brands of silane coupling agents include but are not limited to KH550, KH560, etc. Common brands of titanate coupling agents include but are not limited to LD-WT, TC-311, etc.

[0047] As an optional implementation of the technical solution of the present invention, the diameter of the chopped basalt fiber is 5-25μm (for example, 5μm, 10μm, 15μm, 20μm or 25μm, etc.), and the length is 3-25mm (for example, 3mm, 5mm, 10mm, 12mm, 15mm, 20mm or 25mm, etc.).

[0048] As an optional implementation scheme of the technical solution of the present invention, the weight ratio of chopped basalt fiber and superhydrophobic modifier is 100:(0.1-3), and a typical but non-limiting weight ratio is 100:0.1, 100:0.5, 100:0.8, 100:1, 100:1.5, 100:2, 100:2.5 or 100:3, etc.

[0049] By further limiting the relative amounts of chopped basalt fibers and superhydrophobic modifiers, the obtained modified basalt has better surface properties, improves the bonding condition of the interface between basalt fibers and the matrix, and enhances the bonding performance and toughness.

[0050] As an optional implementation of the technical solution of the present invention, the preparation method of modified basalt fiber includes the following steps: mixing and modifying short chopped basalt fiber with a superhydrophobic modifier, and stirring during the mixing and modification to obtain modified basalt fiber.

[0051] In order to make the superhydrophobic modifier fully modify the short basalt fibers, the superhydrophobic modifier can be first made into a superhydrophobic modifier solution, and then mixed with the short basalt fibers for modification.

[0052] As an optional embodiment of the technical solution of the present invention, the temperature of the mixed modification is 20-30°C, the time of the mixed modification is 5-30min, and the stirring speed is 1500-3000rpm. Typical but non-limiting modification temperatures are 20°C, 22°C, 25°C, 28°C or 30°C, etc., and typical but non-limiting modification times are 5min, 10min, 15min, 20min, 25min or 30min, etc. Typical but non-limiting stirring speeds are 1500rpm, 2000rpm, 2500rpm or 3000rpm, etc.

[0053] As an optional implementation of the technical solution of the present invention, the resin includes at least one of epoxy resin, polyurethane resin or unsaturated polyester resin, preferably epoxy resin.

[0054] As an optional implementation of the technical solution of the present invention, the curing agent includes epoxy curing agents such as polyamides, aliphatic amines, alicyclic amines, modified polyamines, polythiols, such as diethylenetriamine, 593 curing agent, T31 curing agent, 650 curing agent, etc.

[0055] According to a second aspect of the present invention, there is also provided a basalt roadbed, which is made of the basalt roadbed material provided by the first aspect of the present invention.

[0056] In view of the advantages of the above-mentioned basalt roadbed materials, the basalt roadbed produced not only has high strength, small deformation, high water stability, corrosion resistance, and low wetting coefficient, but also has broad application prospects in the roadbed field.

[0057] According to a third aspect of the present invention, there is also provided a method for constructing a basalt roadbed, comprising the following steps:

[0058] S1. Mix basalt crushed stone, resin, curing agent and modified basalt fiber of different particle size ratios to form a basalt roadbed material;

[0059] S2. Fill the basalt roadbed materials in layers on the pre-treated soil surface to form a basalt roadbed.

[0060] The present invention also provides a construction method for a basalt roadbed, which can ensure that the roadbed materials are mixed and reacted in a desired direction, thereby obtaining better performance and ensuring that the roadbed is stable, high-strength and durable.

[0061] As an optional implementation of the technical solution of the present invention, in step S1, basalt crushed stones with different particle size ratios are mixed evenly, and then resin is added. After being dispersed and mixed evenly, curing agent and modified basalt fiber are added and further mixed evenly to form basalt roadbed material.

[0062] The raw materials in the basalt roadbed material are mixed in a certain order to ensure that the materials are mixed evenly and the reaction is controllable.

[0063] As an optional implementation of the technical solution of the present invention, in step S2, the pretreatment step includes the steps of removing debris on the surface of the soil base to be treated, leveling the soil base and then compacting it.

[0064] By limiting the pretreatment steps, the bonding between the soil base and subsequent roadbed materials can be improved, while ensuring that the soil base is stable and has minimal settlement.

[0065] As an optional implementation of the technical solution of the present invention, in step S2, during the layered filling process, after each layer is filled, it is first reciprocated and leveled, then rammed, and then the next layer is filled. The above steps are conducive to improving the density, firmness and uniformity of the overall roadbed, improving the bearing capacity of the roadbed, reducing intra-layer damage and inter-layer separation, and preventing roadbed settlement and cracking.

[0066] As an optional implementation of the technical solution of the present invention, a 18t-25t roller is used for reciprocating rolling and leveling.

[0067] As an optional implementation of the technical solution of the present invention, in step S2, the number of layers of layered filling is 3 to 5, and the thickness of each single layer is 0.2 to 0.3 m. Typical but non-limiting numbers of layers are 3, 4 and 5, and the thickness of a typical but non-limiting single layer is 0.2 m, 0.25 m or 0.3 m, etc.

[0068] As an optional implementation of the technical solution of the present invention, in step S2, the thickness of the formed basalt roadbed is 0.6-1.5 m. Typical but non-limiting thicknesses of the basalt roadbed are 0.6 m, 0.75 m, 0.9 m, 1 m, 1.2 m, 1.25 m or 1.5 m, etc.

[0069] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0070] Example 1

[0071] This embodiment provides a basalt roadbed material, including the following raw materials in parts by weight:

[0072] 100 parts of basalt crushed stone with different particle size ratios, 2 parts of modified basalt fiber, 14 parts of epoxy resin and 1 part of curing agent.

[0073] Among them, basalt crushed stones with different particle size ratios include: 24 parts of 20-30mm basalt crushed stones, 28 parts of 10-20mm basalt crushed stones, 20 parts of 5-10mm basalt crushed stones and 28 parts of <5mm basalt crushed stones.

[0074] The preparation method of modified basalt fiber includes the following steps: mixing and modifying short chopped basalt fiber (average diameter of 17 μm and length of 18 mm) with a super hydrophobic modifier (silane coupling agent KH-560) in a weight ratio of 100:2.5, stirring during the mixing and modification, the mixing and modification temperature is 30°C, the mixing and modification time is 25 minutes, and the stirring speed is 1800 rpm to obtain modified basalt fiber.

[0075] The epoxy resin is bisphenol A epoxy resin E51.

[0076] The curing agent is diethylenetriamine.

[0077] The construction method of forming a basalt roadbed using the basalt roadbed material of this embodiment comprises the following steps:

[0078] S1: Put basalt crushed stones with different particle sizes in a mixer and mix them evenly, then add epoxy resin, disperse and mix them evenly, then add curing agent and modified basalt fiber and mix them evenly to form basalt roadbed material for standby use;

[0079] S2: Soil foundation surface pretreatment: remove debris from the soil foundation surface and level it, then compact the soil foundation;

[0080] S3: The basalt roadbed material mixed evenly in step S1 is transported to the construction site, and then filled in layers on the pretreated soil surface. The number of layers is 3, and the thickness of each layer is 0.3m, 0.3m and 0.2m respectively. After each layer is filled, it is first reciprocated and leveled by an 18t roller, and then compacted by a heavy hammer, and finally the thickness is 0.8m.

[0081] Example 2

[0082] This embodiment provides a basalt roadbed material. The remaining steps are the same as those in Embodiment 1 except that the weight portion of the modified basalt fiber in Embodiment 1 is adjusted from 2 portions to 1 portion.

[0083] Example 3

[0084] This embodiment provides a basalt roadbed material. The remaining steps are the same as those in Embodiment 1 except that the weight portion of the modified basalt fiber in Embodiment 1 is adjusted from 2 parts to 0.5 parts.

[0085] Example 4

[0086] This embodiment provides a basalt roadbed material. Except that the specific type of the superhydrophobic modifier in the preparation process of the modified basalt fiber in Example 1 is adjusted to silane coupling agent KH-550, the remaining steps are the same as those in Example 1.

[0087] Example 5

[0088] This embodiment provides a basalt roadbed material. Except that in the preparation process of the modified basalt fiber in Example 1, the weight ratio of the chopped basalt fiber to the superhydrophobic modifier is adjusted to 100:0.5, the remaining steps are the same as those in Example 1.

[0089] Example 6

[0090] This embodiment provides a basalt roadbed material. Except that the basalt crushed stones with different particle size ratios in Embodiment 1 are adjusted to: 25 parts of 20-30 mm basalt crushed stones, 30 parts of 10-20 mm basalt crushed stones, 17 parts of 5-10 mm basalt crushed stones and 28 parts of <5 mm basalt crushed stones, the remaining steps are the same as Embodiment 1.

[0091] Comparative Example 1

[0092] This comparative example provides a basalt roadbed material. The remaining steps are the same as those in Example 1 except that the weight portion of the modified basalt fiber in Example 1 is adjusted from 2 parts to 0.3 parts.

[0093] Comparative Example 2

[0094] This comparative example provides a basalt roadbed material. Except that the weight portion of the modified basalt fiber in Example 1 is adjusted from 2 parts to 3 parts, the remaining steps are the same as those in Example 1.

[0095] Comparative Example 3

[0096] This comparative example provides a basalt roadbed material. Except that the modified basalt fiber is not added in Example 1, the remaining steps are the same as those in Example 1.

[0097] Comparative Example 4

[0098] This comparative example provides a basalt roadbed material. Except that the modified basalt fiber in Example 1 is directly replaced by chopped basalt fiber (ie, without modification treatment), the remaining steps are the same as those in Example 1.

[0099] Comparative Example 5

[0100] This comparative example provides a basalt roadbed material. Except that the basalt crushed stones with different particle size ratios in Example 1 are adjusted to basalt crushed stones with a single particle size (particle size of 5-10 mm, weight parts of 100 parts), the remaining steps are the same as Example 1.

[0101] Comparative Example 6

[0102] This comparative example provides a roadbed material, except that the basalt crushed stones with different particle size ratios in Example 1 are adjusted to granite crushed stones with corresponding particle size ratios, that is, the granite crushed stones with different particle size ratios include: 24 parts of 20-30mm granite crushed stones, 28 parts of 10-20mm granite crushed stones, 20 parts of 5-10mm granite crushed stones and 28 parts of <5mm granite crushed stones.

[0103] In order to compare the technical effects of the embodiments and comparative examples, the following experimental examples are specially set up.

[0104] Experimental Example 1

[0105] The compressive strength, tensile strength and load ratio (CBR) of the roadbed materials prepared in each embodiment and comparative example were tested. The compressive strength and tensile strength were tested according to GB / T 50081, and the load ratio (CBR) was tested according to JTG3430. The specific results are shown in Table 1.

[0106] Table 1

[0107]

[0108]

[0109] It can be seen from the data in Table 1 that the basalt roadbed material provided by the present invention has higher compressive strength, tensile strength and bearing ratio.

[0110] Specifically, Examples 1-3 and Comparative Examples 1-3 mainly examine the effect of the amount of modified basalt fiber on the performance of the roadbed. It can be seen from the data in the table that with the increase in the proportion of modified basalt fiber in the roadbed material, the compressive strength, tensile strength and bearing ratio of the roadbed all show an upward trend. The roadbed built with this material has a higher bearing capacity and better crack resistance, and excellent stability and durability. When the basalt fiber content is too large (Comparative Example 2), the fibers are prone to agglomeration and unevenness, and the weak interfaces between the fibers and the matrix increase, resulting in a decrease in the overall performance of the roadbed material, and the tensile strength decreases more significantly than the compressive strength.

[0111] Example 4 and Example 5 are comparative experiments of Example 1, respectively investigating the effects of the type and amount of superhydrophobic modifier on the roadbed material during the preparation of modified basalt fiber. From the data in the table, it can be seen that the basalt fibers treated with different superhydrophobic modifiers have different effects on improving the roadbed strength; within a certain range, increasing the amount of superhydrophobic modifier improves the strength and toughness of the overall material.

[0112] Example 6 and Comparative Example 5 are comparative experiments of Example 1, and mainly examine the influence of different crushed stone gradation ratios on the performance of roadbed materials. From the above examples and comparative example data, it can be seen that the roadbed material made of basalt crushed stone with a reasonable gradation ratio has better performance in all aspects than the roadbed material made of basalt crushed stone with a single particle size. This is mainly because the crushed stone with a reasonable gradation ratio has a dense structure, and the coordination mechanism formed by the interlocking and biting between the crushed stones improves the bearing capacity and stability of the material.

[0113] Compared with Example 1, the type of crushed stone was changed in Comparative Example 6. From the data in the table, it can be seen that the overall performance of basalt roadbed material is better than that of granite roadbed material, and it is an ideal material for roadbed.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A basalt roadbed material, characterized in that: The following raw materials are included in parts by weight: 100 parts of basalt crushed stone with different particle sizes, 0.5-2 parts of modified basalt fiber, 8-15 parts of resin and 0.5-1 part of curing agent.

2. The basalt roadbed material according to claim 1, characterized in that: Basalt crushed stones with different particle size ratios include: 20-30 parts of 20-30mm basalt crushed stones, 20-30 parts of 10-20mm basalt crushed stones, 15-20 parts of 5-10mm basalt crushed stones and 20-30 parts of <5mm basalt crushed stones.

3. The basalt roadbed material according to claim 1, characterized in that: The modified basalt fiber is obtained by modifying short-cut basalt fiber with a super-hydrophobic modifier.

4. The basalt roadbed material according to claim 3, characterized in that: The super hydrophobic modifier includes one or a combination of at least two of an aluminate coupling agent, a silane coupling agent, a titanate coupling agent, stearic acid or maleic anhydride; And / or, the chopped basalt fibers have a diameter of 5-25 μm and a length of 3-25 mm; And / or, the weight ratio of the chopped basalt fibers to the superhydrophobic modifier is 100:(0.1-3).

5. The basalt roadbed material according to claim 3, characterized in that: The preparation method of the modified basalt fiber comprises the following steps: mixing and modifying the short-cut basalt fiber and the super-hydrophobic modifier to obtain the modified basalt fiber; Preferably, the mixing and modification temperature is 20-30° C., and the mixing and modification time is 5-30 min.

6. The basalt roadbed material according to any one of claims 1 to 5, characterized in that: The resin comprises at least one of epoxy resin, polyurethane resin or unsaturated polyester resin, preferably epoxy resin; And / or, the curing agent includes at least one of polyamides, aliphatic amines, alicyclic amines, modified polyamines or polythiols.

7. A basalt roadbed, characterized in that: It is mainly formed by paving the basalt roadbed material described in any one of claims 1-6.

8. The construction method of basalt roadbed according to claim 7, characterized in that: The steps include: S1. Mix basalt crushed stone, resin, curing agent and modified basalt fiber of different particle size ratios to form a basalt roadbed material; S2. Fill the basalt roadbed materials in layers on the pre-treated soil surface to form a basalt roadbed.

9. The construction method of basalt roadbed according to claim 8, characterized in that: In step S1, basalt crushed stones with different particle size ratios are mixed evenly, and then resin is added. After being dispersed and mixed evenly, a curing agent and modified basalt fiber are added and further mixed evenly to form a basalt roadbed material.

10. The construction method of basalt roadbed according to claim 8 or 9, characterized in that: In step S2, the pretreatment step includes the steps of removing debris from the surface of the soil base to be treated, leveling the soil base and then compacting it; And / or, in step S2, during the layered filling process, after each layer is filled, it is first reciprocated and leveled, then compacted by a heavy hammer, and then the next layer is filled; preferably, a 18t-25t roller is used for reciprocating rolling and leveling; And / or, in step S2, the number of layers of layered filling is 3 to 5 layers, and the thickness of each single layer is 0.2 to 0.3 m; And / or, in step S2, the thickness of the formed basalt roadbed is 0.6-1.5 m.

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