Roadbed material and high fill roadbed using the same

Abstract

The present application relates to the technical field of road construction, specifically disclosing a roadbed material and a high-fill roadbed using the same. The roadbed material comprises a mixture of the following raw materials in parts by weight: 500-600 parts of backfill crushed stone with a particle size of 10-20 mm; 250-300 parts of backfill crushed stone with a particle size of 1-5 mm; 100-200 parts of backfill crushed stone with a particle size of 30-60 mm; 300-400 parts of modified inorganic filler with a particle size of 6-10 mm; and a binder comprising 300-450 parts of cement; 100-150 parts of diphenol propane glycidyl ether; 80-100 parts of ethylenediamine; and 200-300 parts of water. The roadbed material of the present application can be used in high-fill roadbed construction and has the advantages of being less susceptible to uneven settlement of the roadbed due to factors such as rainfall and vehicle load, thereby extending the service life of the roadbed.

Description

Technical Field

[0001] The present application relates to the technical field of road construction, and more particularly, to a roadbed material and a high fill roadbed using the same. Background Art

[0002] Since the 20th century, due to the increasing demand for land resources, insufficient land supply and prominent land use conflicts have become key factors restricting economic development. The number of projects in the world that use the method of opening mountains and filling valleys to provide construction land is increasing. In areas that are mostly mountainous and hilly, there is little flat terrain. In order to meet construction needs, it is generally necessary to open mountains and fill valleys, and to fill high and dig deep. In these projects, a large amount of crushed stone soil is also produced and used.

[0003] Southwest my country is a region of mountainous and hilly terrain, making high-fill roadbed essential. Due to factors such as gravity and large-size crushing, high-fill roadbeds often experience excessive settlement, exceeding the road surface's tolerances and rendering the road unusable.

[0004] Since the crushed stone mixture used in the high fill roadbed is obtained by mountain blasting, the particle distribution of the crushed stone mixture varies greatly and the filling density is poor. Under the coupling of rainfall, vehicle load and earthquake, the crushed stone mixture with a larger particle distribution is easily broken, causing uneven settlement of the high fill roadbed, making it impossible to guarantee the quality of the roadbed construction, thereby affecting the highway operation effect. Summary of the Invention

[0005] In order to reduce the uneven settlement of high-fill roadbed and improve the construction effect of the roadbed, the present application provides a roadbed material and a high-fill roadbed using the material.

[0006] In the first aspect, the present application provides a roadbed material, which adopts the following technical solution:

[0007] A roadbed material is obtained by mixing the following raw materials in parts by weight:

[0008] 500-600 parts of backfill crushed stone with a particle size of 10-20 mm;

[0009] 250-300 parts of backfill crushed stone with a particle size of 1-5 mm;

[0010] 100-200 parts of backfill crushed stone with a particle size of 30-60 mm;

[0011] 300-400 parts of modified inorganic filler with a particle size of 6-10 mm;

[0012] Binder: 300-450 parts of cement;

[0013] 100-150 parts of diphenol propane glycidyl ether;

[0014] 80-100 parts of ethylenediamine;

[0015] 200-300 parts of water.

[0016] By adopting the above technical solution, modified inorganic fillers are added and compounded with backfill crushed stones of two other different particle gradations, which overcomes the problem of large particle size changes of the blasting crushed stones themselves generated in the process of valley filling in mountainous areas to a certain extent, and cement, diphenol propane glycidyl ether and ethylenediamine are added as binding materials. Ethylene diamine is used as a curing agent for diphenol propane glycidyl ether, so that during the curing process of diphenol propane glycidyl ether, the consolidation of backfill crushed stones with smaller particle gradations can be enhanced. Ethylene diamine and diphenol propane glycidyl ether play a leading role in improving the early bonding strength between the inorganic filler and the crushed stones, and cement plays a leading role in enhancing the later bonding strength between the inorganic filler and the crushed stones through hydration reaction, so that the crushed stones with large particle gradation differences can form a roadbed that is not prone to uneven settlement after backfilling.

[0017] Preferably, the modified inorganic filler is composed of medical stone, hydrochloric acid solution and talc in a weight ratio of 1: (2-3): (1.5-2.5).

[0018] By adopting the above technical solution, an inorganic filler mainly composed of medical stone is added, which can be compounded with backfill crushed stone of different particle size grades to improve the filling density. The hydrochloric acid solution modifies the adsorption structure of the medical stone, enhances the adsorption capacity of the medical stone on talc powder, and thus makes the surface of the medical stone have good fluidity, which is beneficial to improving the filling effect of the inorganic filler.

[0019] Preferably, the preparation method of the modified inorganic filler comprises the following steps:

[0020] The medical stone is soaked in a 0.8-1.3 mol / L hydrochloric acid solution, with the weight ratio of the medical stone to the hydrochloric acid solution being 1:(2-3), and the mixture is soaked for 1-2 hours. After being taken out, talcum powder is wrapped on the surface of the medical stone, with the weight ratio of the medical stone to the talcum powder being 1:(1.5-2.5), thereby finally obtaining a modified inorganic filler.

[0021] By adopting the above technical solution, the medical stone has good adsorption properties and can absorb a large amount of hydrochloric acid solution, and the hydrochloric acid solution promotes the adsorption of the medical stone, which is beneficial to the subsequent adsorption effect of the medical stone on talcum powder;

[0022] In addition, in the later stage of roadbed material solidification, the slow seepage of hydrochloric acid solution is beneficial to reducing the occurrence of alkali-aggregate reaction; and talcum powder is wrapped on the surface of medical stone. On the one hand, talcum powder can reduce the outflow of hydrochloric acid adsorbed in medical stone. On the other hand, talcum powder promotes the fluidity of modified inorganic filler, promotes the density of modified inorganic filler and other backfill gravel filling, improves the uniformity of roadbed filling body, and reduces the problem of uneven settlement of roadbed in the later stage.

[0023] Preferably, 30-60 parts of a promoter are also added, and the promoter is glycerol.

[0024] By adopting the above technical solution, propylene glycol is added as a promoter. On the one hand, the addition of propylene glycol can promote the accelerated reaction of diphenol propane glycidyl ether and ethylenediamine, which is beneficial for the roadbed structure to have a certain bonding strength in the early stage. On the other hand, the good lubricity of propylene glycol itself is utilized to facilitate better integration of backfill crushed stones of different particle sizes and modified inorganic fillers, which is beneficial to improve the filling density and reduce the uneven settlement of the roadbed during the process of being put into use.

[0025] Preferably, 50-80 parts of hexamethylphosphoric triamide are also added.

[0026] By adopting the above technical solution, hexamethylphosphoric triamide is added to modify diphenol propane glycidyl ether. On the one hand, it is beneficial to form a roadbed structure with a stable structure and hydrophobic surface after the diphenol propane glycidyl ether is cured. On the other hand, the addition of hexamethylphosphoric triamide can reduce the elastic modulus of the cured binder material, reduce the cured volume shrinkage of the binder material, reduce the shrinkage stress, and further reduce the problem of uneven settlement caused by particle breakage of the backfill material due to rainfall and vehicle load.

[0027] Preferably, the hexamethylphosphoric triamide is added by first mechanically mixing the hexamethylphosphoric triamide and diphenol propane glycidyl ether and then adding the mixture.

[0028] By adopting the above technical solution, diphenol propane glycidyl ether is used as the epoxy resin, and hexamethylphosphoric triamide is added and first mixed with diphenol propane glycidyl ether to achieve the effect of toughening the epoxy resin. Moreover, the special structure of hexamethylphosphoric triamide, after being compounded with the epoxy resin, introduces polar groups into the molecular chain of the epoxy resin and increases the molecular weight of the epoxy resin, thereby further enhancing the bonding strength.

[0029] Preferably, 30-50 parts of triolein are also added, and the triolein is added together with hexamethylphosphoric triamide.

[0030] By adopting the above technical solution, the addition of triolein can, on the one hand, synergize with hexamethylphosphoric triamide to improve the hydrophobicity of the roadbed surface; on the other hand, triolein can undergo an ester exchange reaction with propylene glycol, and the hydrochloric acid solution adsorbed in the medical stone slowly seeps out to provide an acidic environment for the ester exchange reaction, further reducing the volume shrinkage of the binder material during the later curing process, and ensuring that the roadbed structure is not prone to uneven settlement.

[0031] In a second aspect, the present application provides a high fill roadbed using roadbed materials, which adopts the following technical solution:

[0032] A high fill roadbed using roadbed materials is prepared using any one of the roadbed materials described above.

[0033] By adopting the above technical solution, the roadbed made of the above roadbed materials through layered filling, compaction and other construction processes has good strength, can greatly reduce the uneven settlement of the roadbed, and is not prone to uneven settlement of the roadbed due to rainfall and vehicle load, thereby extending the service life of the roadbed.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. Since this application uses backfill crushed stone materials with different particle gradations and modified inorganic fillers for compounding, ethylenediamine and diphenol propane glycidyl ether play a leading role in improving the initial bonding strength between the inorganic filler and the crushed stone materials, and cement plays a leading role in enhancing the later bonding strength between the inorganic filler and the crushed stone materials through hydration reaction, thereby enabling the crushed stone materials with large differences in particle gradations to form a roadbed that is less prone to uneven settlement after backfilling.

[0036] 2. The modified inorganic filler preferably adopts medical stone, hydrochloric acid solution and talcum powder to make in the application; adding the inorganic filler with medical stone as the main body; can be composite with the backfill crushed stone material of different particle size grades; play the effect of improving filling density; hydrochloric acid solution modifies the adsorption structure of medical stone; strengthens medical stone to the adsorption capacity of talcum powder; and then makes the surface of medical stone have good fluidity, is conducive to improving the filling effect of inorganic filler.

[0037] 3. The high fill roadbed of roadbed materials used in this application has good strength through layered filling, compaction and other construction processes, which can greatly reduce the uneven settlement of the roadbed. It is not easy to cause uneven settlement of the roadbed due to rainfall and vehicle load, thereby extending the service life of the roadbed. DETAILED DESCRIPTION

[0038] Source of raw materials

[0039] All raw materials in this application are commercially available. The following sources of raw materials are disclosed only for clarity of disclosure and should not limit the scope of protection.

[0040] The cement is 42.5R Portland cement;

[0041] Medical stone density 2.3g / cm 3 ;

[0042] Diphenol propane glycidyl ether CAS number: 25085-99-8;

[0043] Ethylenediamine CAS number: 107-15-3;

[0044] Talc CAS number: 14807-96-6; density: 2.7-2.8g / cm 3 ; Fineness: 30-60 mesh;

[0045] Glycerol CAS number: 56-81-5;

[0046] Hexamethylphosphoric triamide CAS number: 680-31-9;

[0047] Triolein CAS number: 122-32-7.

[0048] Preparation Example

[0049] Preparation Examples 1A-1C

[0050] A modified inorganic filler, the preparation method of which comprises the following steps:

[0051] The medical stone is soaked in a 1 mol / L hydrochloric acid solution, with the weight ratio of the medical stone to the hydrochloric acid solution being 1:(2-3), and the mixture is soaked for 1-2 hours. After being taken out, talcum powder is wrapped around the outside of the medical stone, with the weight ratio of the medical stone to the talcum powder being 1:(1.5-2.5), thereby finally obtaining a modified inorganic filler.

[0052] The amounts of raw materials used for the modified inorganic fillers of Preparation Examples 1A-1C are shown in Table 1.

[0053] Table 1 Amount of raw materials used for the modified inorganic fillers in Preparation Examples 1A-1C

[0054] Preparation Example 1A Preparation Example 1B Preparation Example 1C Medical stone / kg 10 10 10 Hydrochloric acid solution / kg 25 20 30 Talc powder / kg 20 15 25 The dosage ratio of medical stone, hydrochloric acid solution and talcum powder 1:2.5:2 1:2:1.5 1:3:2.5

[0055] Preparation Example 2

[0056] A modified inorganic filler is different from Preparation Example 1A in that medical stone is replaced by an equal amount of granite.

[0057] Preparation Example 3

[0058] A modified inorganic filler is different from that in Preparation Example 1A in that talc is replaced by an equal amount of calcium carbonate.

[0059] Comparative Preparation Example 1

[0060] A modified inorganic filler, which is different from Preparation Example 1A in that the amount of medical stone used is 0 kg.

[0061] Comparative Preparation Example 2

[0062] A modified inorganic filler, which is different from Preparation Example 1A in that the amount of hydrochloric acid solution used is 0 kg.

[0063] Comparative Preparation Example 3

[0064] A modified inorganic filler, which is different from Preparation Example 1A in that the amount of talc powder used is 0 kg. Example

[0065] Examples 1A-1C

[0066] A roadbed material is obtained by mixing the following raw materials by weight:

[0067] 500-600kg of backfill crushed stone with a particle size of 10-20mm;

[0068] 250-300kg of backfill crushed stone with a particle size of 1-5mm;

[0069] 100-200kg of backfill crushed stone with a particle size of 30-60mm;

[0070] 300-400kg of modified inorganic filler with a particle size of 6-10mm;

[0071] Cement 300-450kg;

[0072] Diphenol propane glycidyl ether 100-150kg;

[0073] Ethylenediamine 80-100kg;

[0074] 200-300kg of water.

[0075] The modified inorganic filler is prepared according to Preparation Example 1A.

[0076] The raw material consumption of roadbed materials is shown in Table 2.

[0077] Table 2 Raw material consumption of roadbed materials (unit: kg)

[0078] Example 1A Example 1B Example 1C Backfill crushed stone with a particle size of 10-20 mm 550 500 600 Backfill crushed stone with a particle size of 1-5 mm 280 250 300 Backfill crushed stone with a particle size of 30-60 mm 150 100 200 Modified inorganic filler with particle size of 6-10mm 350 300 400 cement 350 300 450 Diphenolpropane glycidyl ether 120 100 150 Ethylenediamine 90 80 100 water 250 200 300

[0079] Example 2-3

[0080] A roadbed material, which is different from Example 1A in that the modified inorganic filler is prepared in sequence according to Preparation Examples 2-3.

[0081] Examples 4A-4C

[0082] A roadbed material, which differs from Example 1A in that 30-60 kg of an accelerator is further added, wherein the accelerator is glycerol;

[0083] The amount of accelerator added to the roadbed material of Example 4A was 30 kg;

[0084] The amount of accelerator added to the roadbed material of Example 4B was 45 kg;

[0085] The amount of accelerator added to the roadbed material of Example 4C is 60 kg.

[0086] Example 5

[0087] A road base material, which is different from Example 4B in that glycerol is replaced by an equal amount of ethylene glycol.

[0088] Examples 6A-6C

[0089] A roadbed material, which differs from Example 4B in that 50-80 kg of hexamethylphosphoric triamide is further added. The hexamethylphosphoric triamide is added by first mechanically mixing hexamethylphosphoric triamide with diphenol propane glycidyl ether for 1 hour and then mixing with other raw materials.

[0090] The amount of hexamethylphosphoric triamide added to the roadbed material of Example 6A was 50 kg;

[0091] The amount of hexamethylphosphoric triamide added to the roadbed material of Example 6B was 60 kg;

[0092] The amount of hexamethylphosphoric triamide added to the roadbed material of Example 6C is 80 kg.

[0093] Examples 7A-7C

[0094] A roadbed material, which is different from Example 6B in that 30-50 kg of triolein is further added. The triolein is added by mixing with hexamethylphosphoric triamide.

[0095] The amount of triolein added to the roadbed material of Example 7A was 30 kg;

[0096] The amount of triolein added to the roadbed material in Example 7B was 40 kg;

[0097] The amount of triolein added to the roadbed material of Example 7C was 50 kg.

[0098] Example 8

[0099] A road base material is different from Example 7B in that an equal amount of glycidyl methacrylate is used to replace triolein.

[0100] Comparative Examples 1-3

[0101] A roadbed material, which is different from Example 1A in that the modified inorganic filler is prepared by Comparative Preparation Examples 1-3.

[0102] Comparative Example 4

[0103] A roadbed material, which is different from Example 1A in that the amount of modified inorganic filler used is 0 kg.

[0104] Comparative Example 5

[0105] A roadbed material, which is different from Example 1A in that the particle size of the modified inorganic filler is 1-5 mm.

[0106] Comparative Example 6

[0107] A roadbed material, which is different from Example 1A in that the particle size of the modified inorganic filler is 15-20 mm. DETAILED DESCRIPTION

[0109] The tests include:

[0110] 1. Strength performance test

[0111] The above-mentioned roadbed materials were constructed according to the construction method specified in the "DB22T5015-2019" recycled aggregate road base engineering technical standard to obtain roadbed test blocks. The thickness of the test blocks was 50 cm. The compressive strength and flexural strength tests were carried out according to the method specified in GB / T50081-2002 "Test Methods for Mechanical Properties of Ordinary Concrete". The compressive strength and flexural strength tests showed that the stronger the roadbed test blocks, the better their strength performance.

[0112] 2. Water permeability test

[0113] The permeability coefficient test is carried out according to the method specified in CJJ135-2009 "Technical Code for Permeable Concrete Pavement". The lower the permeability coefficient, the more stable the roadbed is and the less likely it is to be damaged by precipitation.

[0114] Strength tests and water permeability tests were performed on Examples 1-8 and Comparative Examples 1-6. The test results are shown in Table 3.

[0115] Table 3 Test results of Examples 1-8 and Comparative Examples 1-6

[0116] 28d compressive strength (Mpa) 28d flexural strength (Mpa) Water permeability coefficient (mL / min) Example 1A 81.3 12.4 3.5 Example 1B 81.5 12.6 3.4 Example 1C 81.2 12.4 3.6 Example 2 75.2 10.6 4.5 Example 3 73.6 10.1 4.2 Example 4A 82.5 13.5 2.8 Example 4B 82.8 13.8 2.4 Example 4C 82.4 13.2 2.7 Example 5 81.4 12.2 3.1 Example 6A 84.4 14.6 2.1 Example 6B 84.6 14.8 2 Example 6C 84.2 14.5 2.2 Example 7A 85.5 15.4 1.6 Example 7B 85.8 15.5 1.5 Example 7C 85.7 15.3 1.7 Example 8 83.5 14.9 1.9 Comparative Example 1 68.6 8.8 6.3 Comparative Example 2 69.1 9.4 5.3 Comparative Example 3 68.5 8.9 6.7 Comparative Example 4 60.3 7.3 5.6 Comparative Example 5 72.3 8.1 6.2 Comparative Example 6 69.1 7.5 5.8

[0117] Combining Examples 1A-1C and Comparative Examples 4-6 with Table 3, it can be seen that the addition of modified inorganic fillers and compounding with the other two backfill crushed stones with different particle sizes can, to a certain extent, overcome the problem of large particle size variations of the blasted crushed stones themselves generated during valley filling in mountainous areas. In addition, the addition of cement, diphenol propane glycidyl ether, and ethylenediamine as binder materials, and ethylenediamine as a curing agent for diphenol propane glycidyl ether, can enhance the consolidation of the backfill crushed stones with smaller particle sizes during the curing process of the diphenol propane glycidyl ether.

[0118] In combination with Example 1A and Examples 2-3, Comparative Examples 1-3 and Table 3, it can be seen that Example 1A is better than Examples 2-3 and Comparative Examples 1-3, indicating that the addition of medical stone in the present application has good adsorption, can adsorb a large amount of hydrochloric acid solution, and the hydrochloric acid solution promotes the adsorption of medical stone, which is beneficial to the subsequent adsorption effect of medical stone on talcum powder; in addition, in the later stage of roadbed material curing, the slow seepage of hydrochloric acid solution is beneficial to reducing the occurrence of alkali-aggregate reaction; and talcum powder is wrapped on the surface of medical stone. On the one hand, talcum powder can reduce the outflow of hydrochloric acid adsorbed in the medical stone. On the other hand, talcum powder promotes the fluidity of the modified inorganic filler, promotes the compaction of the modified inorganic filler and other backfill gravel, improves the uniformity of the roadbed fill, and reduces the problem of uneven settlement of the roadbed in the later stage.

[0119] Combining Examples 4A-4C, Example 5 and Example 1A and Table 3, it can be seen that Examples 4A-4C are better than Examples 5 and Example 1A, indicating that the present application adds glycerol as a promoter. The addition of glycerol can, on the one hand, promote the accelerated reaction of diphenol propane glycidyl ether and ethylenediamine, which is beneficial for the roadbed structure to have a certain bonding strength in the early stage. On the other hand, the good lubricity of glycerol itself is beneficial for backfill gravel of different particle size grades and modified inorganic fillers to be better embedded, which is beneficial to improve the filling density and reduce the uneven settlement of the roadbed during the process of being put into use.

[0120] Combining Examples 6A-6C and Example 4B and Table 3, it can be seen that Examples 6A-6C are better than Example 4B, indicating that the addition of hexamethylphosphoric triamide in the present application has a modifying effect on diphenol propane glycidyl ether. On the one hand, it is beneficial to form a roadbed structure with a stable structure and a hydrophobic surface after the diphenol propane glycidyl ether is cured. On the other hand, the addition of hexamethylphosphoric triamide can reduce the elastic modulus of the cured binder material, reduce the solidification volume shrinkage of the binder material, reduce the shrinkage stress, and further reduce the problem of uneven settlement caused by particle breakage of the backfill material due to rainfall and vehicle load.

[0121] Combining Examples 7A-7C, Example 8 and Example 6B and Table 3, it can be seen that Examples 7A-7C are better than Examples 8 and Example 6B, indicating that the addition of triolein in this application can synergize with hexamethylphosphoric triamide to improve the hydrophobicity of the roadbed surface, and triolein can also undergo an ester exchange reaction with glycerol. The hydrochloric acid solution adsorbed in the medical stone slowly seeps out and provides an acidic environment for the ester exchange reaction, further reducing the volume shrinkage of the binder during the later curing process, and ensuring that the roadbed structure is not prone to uneven settlement.

[0122] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A roadbed material, characterized in that: The raw materials comprising the following parts by weight are mixed to obtain: 500-600 parts of backfill crushed stone with a particle size of 10-20 mm; 250-300 parts of backfill crushed stone with a particle size of 1-5 mm; 100-200 parts of backfill crushed stone with a particle size of 30-60 mm; 300-400 parts of modified inorganic filler with a particle size of 6-10 mm; 300-450 parts of cement; 100-150 parts of diphenol propane glycidyl ether; 80-100 parts of ethylenediamine; 200-300 parts water; 30-60 parts of glycerol; 50-80 parts of hexamethylphosphoric triamide; 30-50 parts of triolein; The method of adding hexamethylphosphoric triamide is to first mechanically mix hexamethylphosphoric triamide and diphenol propane glycidyl ether and then add the mixture; the method of adding triolein is to add the mixture together with hexamethylphosphoric triamide; The preparation method of the modified inorganic filler comprises the following steps: The medical stone is soaked in a 0.8-1.3 mol / L hydrochloric acid solution, with the weight ratio of the medical stone to the hydrochloric acid solution being 1:(2-3), and the mixture is soaked for 1-2 hours. After being taken out, talcum powder is wrapped on the surface of the medical stone, with the weight ratio of the medical stone to the talcum powder being 1:(1.5-2.5), thereby finally obtaining a modified inorganic filler.

2. A high fill roadbed using roadbed materials, characterized by: The roadbed material according to claim 1 is prepared.