Soil stabilizer for road and preparation method thereof

Abstract

The invention relates to the technical field of road engineering materials, in particular to a soil stabilizer for a road and a preparation method of the soil stabilizer. The soil stabilizer for the road is prepared from the following raw materials in parts by weight: 10 to 85 parts of glucan, 2 to 25 parts of halogenated epoxy compound, 5 to 50 parts of sulfamic acid, 2 to 20 parts of glycidyl ether and 20 to 150 parts of solid waste filler. Glucan is modified through a halogenated epoxy compound, an epoxy group is introduced into the glucan, and a chemical relation is established through sulfamic acid and glycidyl ether to obtain an organic framework polymer, so that the organic framework polymer can play a supporting role in soil, can also improve moisture diffusion and absorption efficiency and improve the aggregation degree of soil particles, and can be used for improving the soil moisture diffusion and absorption efficiency. The bearing capacity and stability of the soil are optimized, and the freezing resistance of the soil is improved. The soil stabilizer for the road provided by the invention can effectively solve the technical problems of poor soil bearing capacity and poor freezing resistance of the road at present.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering materials, in particular to a road soil stabilizer and a preparation method thereof. Background Art

[0002] Soil stabilizer is an engineering material that can change the physical and chemical properties of soil and give it engineering properties. With the rapid development of road engineering construction in my country, soil stabilizers are used in road engineering construction, which can not only fully guarantee the sufficient bearing capacity and stability of the soil, but also save unnecessary waste of resources, which is in line with the green and sustainable development path of the ecological environment.

[0003] At present, in road applications, lime, fly ash, cement, etc. are often used as stabilizers to solidify the soil, which can not only alleviate the pressure of the gradual scarcity of materials such as stone and gravel aggregates, but also further reduce the waste generated by road projects. However, this type of solidified soil has the problems of low strength and poor freeze-thaw resistance. Lime reinforced roadbed products have high early strength but slow subsequent strength development. Cement reinforcement will shrink greatly, leading to cracking of the road surface. Fly ash is easy to produce dust and pollute the atmosphere without treatment. These stabilized soils cannot meet the high bearing capacity, water stability and frost resistance required for advanced road soils. In addition, the cement industry belongs to a high carbon emission industry, and the carbon emissions during cement production are high, which is not conducive to environmental protection. Therefore, there is an urgent need for a road soil stabilizer that can not only effectively solidify the soil, but also reduce the use of high carbon emission raw materials, thereby meeting human needs in soil road functionalization. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a road soil stabilizer and a preparation method thereof. The soil stabilizer is added to the soil and interspersed between the gaps between soil particles to form a strong skeleton, which can comprehensively improve the bearing capacity and stability of road soil, and can effectively solve the current technical problems of poor bearing capacity and poor frost resistance of road soil.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The invention provides a road soil stabilizer. The raw materials include 10 to 85 parts of dextran, 2 to 25 parts of halogenated epoxy compounds, 5 to 50 parts of aminosulfonic acid, 2 to 20 parts of glycidyl ether and 20 to 150 parts of solid waste fillers by weight.

[0007] Furthermore, the raw materials of the road soil stabilizer include, by weight, 14 to 82 parts of dextran, 2 to 23 parts of halogenated epoxy compounds, 8 to 47 parts of aminosulfonic acid, 3 to 19 parts of glycidyl ether, and 26 to 135 parts of solid waste fillers.

[0008] Furthermore, the halogenated epoxy compound is one or more of epichlorohydrin, epichlorohydrin, epibromohydrin and epibromobutylene.

[0009] Preferably, the halogenated epoxy compound is epichlorohydrin.

[0010] Furthermore, the mass ratio of dextran to the halogenated epoxy compound is 1:(0.05-0.5).

[0011] Exemplarily, the mass ratio of dextran to the halogenated epoxy compound is 1:0.06, 1:0.1, 1:0.2, 1:0.3 or 1:0.5.

[0012] Preferably, the mass ratio of dextran to halogenated epoxy compound is 1:(0.1-0.3).

[0013] Furthermore, the aminosulfonic acid is at least one of 2,2'-benzidine disulfonic acid, 4,4'-diaminostilbene-2,2'-disulfonic acid, m-phenylenediamine-4,6-disulfonic acid, 2,5-diaminophenyl-1,3-disulfonic acid, and 2,5-diaminobenzene-1,4-disulfonic acid.

[0014] Preferably, the aminosulfonic acid is 2,2'-benzidine disulfonic acid.

[0015] Furthermore, the glycidyl ether is at least one of phenyl glycidyl ether, o-cresyl glycidyl ether, p-sec-butylphenol glycidyl ether, glycidyl methyl ether, ethyl glycidyl ether, butyl glycidyl ether, and isopropyl glycidyl ether.

[0016] Preferably, the glycidyl ether is at least one of phenyl glycidyl ether, o-cresyl glycidyl ether, and p-sec-butylphenol glycidyl ether.

[0017] Furthermore, the solid waste filler is at least one of blast furnace slag, fly ash, gypsum, steel slag and fly ash.

[0018] Preferably, the solid waste filler is at least one of blast furnace slag and gypsum.

[0019] Furthermore, the solid waste filler is a mixture of blast furnace slag and gypsum.

[0020] Furthermore, the mass ratio of blast furnace slag to gypsum is 1:(0.1-1.0).

[0021] Exemplarily, the mass ratio of blast furnace slag to gypsum is 1:0.1, 1:0.3, 1:0.5, 1:0.6 or 1:0.8.

[0022] Preferably, the mass ratio of blast furnace slag to gypsum is 1:(0.3-0.6).

[0023] Gypsum has a certain water absorption capacity and becomes sticky after absorbing water. It forms a good grading relationship with blast furnace slag to fill the soil pores. Blast furnace slag can also compensate for the unstable effect of soil caused by the volume expansion of gypsum after absorbing water.

[0024] Furthermore, the average particle size of the blast furnace slag is 15 to 45 μm.

[0025] Illustratively, the average particle size of the blast furnace slag is 15 μm, 20 μm, 30 μm, 35 μm or 45 μm.

[0026] Preferably, the average particle size of the blast furnace slag is 20 to 35 μm.

[0027] Furthermore, the average particle size of the gypsum is 5 to 35 μm.

[0028] Exemplarily, the average particle size of the gypsum is 5 μm, 10 μm, 25 μm or 35 μm.

[0029] Preferably, the average particle size of the gypsum is 10 to 25 μm.

[0030] The road soil stabilizer provided in the above technical solution is a polysaccharide modified by a halogenated epoxy compound, whereby epoxy groups are introduced into the polysaccharide so as to generate an organic skeleton polymer through the reaction of aminosulfonic acid and glycidyl ether. The organic skeleton polymer plays a structural supporting role in the soil, effectively dispersing and absorbing external stress, thereby improving the bearing capacity of the soil.

[0031] Among them, the surface of glucan contains abundant hydroxyl groups, which has good hydrophilic and water absorption effects. It can destroy and absorb the water film coated on the surface of soil particles and improve the cohesion between soil particles; the other end is connected to glycidyl ether through aminosulfonic acid to increase the hydrophobicity, which is beneficial to improve the overall hydrophobicity and impermeability of the soil. The glucan modified by the halogenated epoxy compound is connected together by aminosulfonic acid and glycidyl ether reaction, realizing a stabilizer structure with one end hydrophilic and one end hydrophobic, which can effectively improve the hydrophobicity of soil particles, further improve the cohesion between soil particles, and benefit the internal structure of the soil, thereby ensuring the bearing capacity of the soil. By adding solid waste fillers, it can be used to fill the pores inside the soil, optimize the pore structure, and thus improve the soil bearing capacity. In addition, glucan can produce a certain viscosity after absorbing water. Therefore, the above-mentioned soil stabilizer is beneficial to increase the interfacial bonding force between soil particles, further improving the bearing capacity and frost resistance of the soil.

[0032] The sulfonic acid group introduced in the above scheme has a large steric hindrance and electrostatic repulsion. On the one hand, it can effectively reduce the disordered stacking of the organic skeleton polymer side chains, making it more dispersed in the soil, thereby better absorbing and dispersing external stress and improving the soil bearing capacity; on the other hand, with the increase of human industrial activities, the heavy metal content in the soil is also showing an increasing trend. It can complex with the heavy metal ions in the soil, coordinate the complexation of heavy metal ions with the surface hydroxyl groups of glucan, optimize the internal structure of the soil and the soil density, and improve the frost resistance in later road applications.

[0033] The present invention also provides a method for preparing the road soil stabilizer described in any of the above technical solutions, characterized in that it comprises the following steps:

[0034] (1) adding dextran to a sodium hydroxide solution, stirring until completely dissolved, then adding a halogenated epoxy compound, stirring fully at 40 to 60° C. for 2 to 5 hours, precipitating with ethanol, centrifuging, washing, and drying to obtain a modified dextran;

[0035] (2) dissolving the modified dextran in dimethyl sulfoxide, then adding aminosulfonic acid and glycidyl ether dissolved in dimethyl sulfoxide, stirring at 50 to 70° C. for 2 to 5 hours, discharging, washing with warm water, and drying to obtain an organic skeleton polymer;

[0036] (3) The organic skeleton polymer and the solid waste filler are mixed evenly to obtain the road soil stabilizer.

[0037] The present invention has the following beneficial effects:

[0038] (1) Aiming at the functional requirements of soil in road application scenarios, the present invention prepares a road soil stabilizer using dextran, halogenated epoxy compounds, aminosulfonic acid, glycidyl ether, and solid waste filler, which effectively regulates the internal structure of the soil and can effectively improve the soil bearing capacity and antifreeze performance.

[0039] (2) The road soil stabilizer provided by the present invention utilizes halogenated epoxy compounds to modify glucan to obtain modified glucan with richer active sites, and uses aminosulfonic acid, modified glucan and glycidyl ether to prepare an organic skeleton polymer. The polymer can effectively regulate the internal structure of the soil, play a dual role of soil moisture regulation and skeleton support, improve soil particle aggregation and soil stress dispersion, and enhance soil bearing capacity and frost resistance.

[0040] (3) The soil stabilizer of the present invention effectively fills the internal pores of the soil, optimizes the internal structure of the soil, and improves the bearing capacity of the soil by introducing solid waste fillers with a reasonable ratio.

[0041] (4) The soil stabilizer of the present invention can form an insoluble complex by introducing sulfonic acid groups to cooperate with the chelation effect of hydroxyl groups in glucan on metal ions, which helps to optimize the internal structure and soil density of the soil, thereby optimizing the bearing capacity and frost resistance of the soil.

[0042] (5) The preparation method of the soil stabilizer provided by the present invention is simple and convenient to operate, has a short preparation cycle, saves process costs, and is suitable for mass production and popularization. DETAILED DESCRIPTION

[0043] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, it does not mean that the features of this invention are limited to the implementation.

[0044] Example

[0045] A road soil stabilizer comprises, by weight, 10 to 85 parts of dextran, 2 to 25 parts of halogenated epoxy compounds, 5 to 50 parts of aminosulfonic acid, 2 to 20 parts of glycidyl ether, and 20 to 150 parts of solid waste fillers.

[0046] In some embodiments, the raw materials of the road soil stabilizer include, by weight, 14 to 82 parts of dextran, 2 to 23 parts of halogenated epoxy compounds, 8 to 47 parts of aminosulfonic acid, 3 to 19 parts of glycidyl ether, and 26 to 135 parts of solid waste filler.

[0047] In some embodiments, the halogenated epoxy compound is one or more of epichlorohydrin, epichlorohydrin, epibromohydrin, and epibromobutylene.

[0048] In some embodiments, the halogenated epoxy compound is epichlorohydrin.

[0049] In some embodiments, the mass ratio of dextran to the halogenated epoxy compound is 1:(0.05-0.5).

[0050] Exemplarily, the mass ratio of dextran to the halogenated epoxy compound is 1:0.06, 1:0.1, 1:0.2, 1:0.3 or 1:0.5.

[0051] In some embodiments, the mass ratio of dextran to the halogenated epoxy compound is 1:(0.1-0.3).

[0052] In some embodiments, the aminosulfonic acid is at least one of 2,2′-benzidine disulfonic acid, 4,4′-diaminostilbene-2,2′-disulfonic acid, m-phenylenediamine-4,6-disulfonic acid, 2,5-diaminophenyl-1,3-disulfonic acid, and 2,5-diaminobenzene-1,4-disulfonic acid.

[0053] In some embodiments, the aminosulfonic acid is 2,2'-benzidine disulfonic acid.

[0054] In some embodiments, the glycidyl ether is at least one of phenyl glycidyl ether, o-cresyl glycidyl ether, p-sec-butylphenol glycidyl ether, glycidyl methyl ether, ethyl glycidyl ether, butyl glycidyl ether, and isopropyl glycidyl ether.

[0055] In some embodiments, the glycidyl ether is at least one of phenyl glycidyl ether, o-cresyl glycidyl ether, and p-sec-butylphenol glycidyl ether.

[0056] In some embodiments, the solid waste filler is at least one of blast furnace slag, fly ash, gypsum, steel slag, and fly ash.

[0057] In some embodiments, the solid waste filler is at least one of blast furnace slag and gypsum.

[0058] In some embodiments, the solid waste filler is a mixture of blast furnace slag and gypsum.

[0059] In some embodiments, the mass ratio of blast furnace slag to gypsum is 1:(0.1-1.0).

[0060] In some embodiments, the mass ratio of blast furnace slag to gypsum is 1:0.1, 1:0.3, 1:0.5, 1:0.6 or 1:0.8.

[0061] In some embodiments, the mass ratio of blast furnace slag to gypsum is 1:(0.3-0.6).

[0062] Gypsum has a certain water absorption capacity and becomes sticky after absorbing water. It forms a good grading relationship with blast furnace slag to fill the soil pores. Blast furnace slag can also compensate for the unstable effect of soil caused by the volume expansion of gypsum after absorbing water.

[0063] In some embodiments, the average particle size of the blast furnace slag is 15-45 μm.

[0064] Illustratively, the average particle size of the blast furnace slag is 15 μm, 20 μm, 30 μm, 35 μm or 45 μm.

[0065] In some embodiments, the average particle size of the blast furnace slag is 20-35 μm.

[0066] In some embodiments, the average particle size of the gypsum is 5 to 35 μm.

[0067] Exemplarily, the average particle size of the gypsum is 5 μm, 10 μm, 25 μm or 35 μm.

[0068] In some embodiments, the average particle size of the gypsum is 10-25 μm.

[0069] The present invention mainly utilizes halogenated epoxy compounds to modify dextran, and introduces epoxy groups into dextran, so as to establish chemical connections with glycidyl ether through aminosulfonic acid, and obtain organic skeleton polymers. The modified dextran makes up for the poor hydrophilicity and water absorption of glycidyl ether, so that it can play a supporting role in soil solidification, and can also regulate the moisture content in the soil, improve water diffusion and absorption efficiency, and increase the aggregation of soil particles, and optimize the bearing capacity of the soil through two approaches. In addition, dextran has abundant hydroxyl groups, which can play a good complexing effect on heavy metal ions in the soil, and the effect of sulfonic acid groups in the synergistic stabilizer on heavy metal ions, optimize the internal structure of the soil and the soil density, thereby improving the frost resistance of the soil.

[0070] In the present invention, by introducing sulfonic acid groups, the disordered stacking of the organic skeleton polymer side chains can be effectively reduced, making it more dispersed in the soil, thereby better absorbing and dispersing external stress and improving the soil bearing capacity. It can also form a stable complex with the metal ions in the inorganic filler, and cooperate with the complexing effect of the hydroxyl groups in the system on the heavy metal ions to jointly improve the frost resistance of the soil.

[0071] The preparation method of the soil stabilizer comprises the following steps:

[0072] (1) adding 10 to 85 parts of dextran to 500 to 3000 parts of a sodium hydroxide solution having a concentration of 0.2 to 1.0 mol / L, stirring until completely dissolved, then adding 2 to 25 parts of a halogenated epoxy compound, stirring at a temperature of 40 to 60° C. for 2 to 5 hours, precipitating with ethanol, centrifuging, washing, and drying to obtain a modified dextran;

[0073] (2) dissolving the modified dextran in 200-800 parts of dimethyl sulfoxide, and then adding 5-50 parts of aminosulfonic acid dissolved in 10-80 parts of dimethyl sulfoxide and 2-20 parts of glycidyl ether dissolved in 5-30 parts of dimethyl sulfoxide, respectively, stirring at 50-70° C. for 2-5 hours, discharging, washing with warm water, and drying to obtain an organic skeleton polymer;

[0074] (3) The organic skeleton polymer is mixed evenly with 20 to 150 parts of solid waste filler to obtain the road soil stabilizer.

[0075] The road soil stabilizer prepared according to the above scheme can give the soil higher bearing capacity and frost resistance.

[0076] To make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention are described in further detail below. In the following examples, unless otherwise specified, the raw materials used are all common commercial products, and the dextran (CAS: 9051-97-2) used was purchased from Wuhan Kamik Technology Co., Ltd.

[0077] Example 1

[0078] The present embodiment provides a road soil stabilizer, whose raw materials include, by weight, 40 parts of dextran, 9 parts of epichlorohydrin, 23 parts of 2,2'-benzidine disulfonic acid, 9.5 parts of phenyl glycidyl ether, 45 parts of blast furnace slag and 23 parts of gypsum.

[0079] Among them, the mass ratio of dextran to epichlorohydrin is 1:0.225, the mass ratio of blast furnace slag to gypsum is 1:0.51, the average particle size of blast furnace slag is 28 μm, and the average particle size of gypsum is 17 μm.

[0080] The preparation method of the road soil stabilizer provided in this embodiment comprises the following steps:

[0081] (1) adding 40 parts of dextran to 1500 parts of a 0.8 mol / L sodium hydroxide solution, stirring until completely dissolved, then adding 9 parts of epichlorohydrin, stirring at 50° C. for 3 h, precipitating with ethanol, centrifuging, washing, and drying to obtain modified dextran;

[0082] (2) dissolving the modified dextran in 500 parts of dimethyl sulfoxide, then dissolving 23 parts of 2,2'-benzidine disulfonic acid in 40 parts of dimethyl sulfoxide and adding the mixture, and dissolving 9.5 parts of phenyl glycidyl ether in 15 parts of dimethyl sulfoxide and adding the mixture, stirring the mixture at 60° C. for 3 h, discharging the mixture, washing the mixture with warm water, and drying the mixture to obtain an organic skeleton polymer;

[0083] (3) The organic skeleton polymer is uniformly mixed with 45 parts of blast furnace slag and 23 parts of gypsum to obtain a road soil stabilizer.

[0084] Example 2

[0085] The present embodiment provides a road soil stabilizer, whose raw materials include, by weight, 14.5 parts of dextran, 2 parts of epichlorohydrin, 8.3 parts of 2,2'-benzidine disulfonic acid, 3.4 parts of o-cresyl glycidyl ether, 20 parts of blast furnace slag and 6 parts of gypsum.

[0086] The mass ratio of dextran to epichlorohydrin is 1:0.138, the mass ratio of blast furnace slag to gypsum is 1:0.3, the average particle size of blast furnace slag is 25 μm, and the average particle size of gypsum is 22 μm.

[0087] The road soil stabilizer provided in this embodiment comprises the following steps:

[0088] (1) adding 14.5 parts of dextran to 800 parts of a 0.6 mol / L sodium hydroxide solution, stirring until completely dissolved, then adding 2 parts of epichlorohydrin, stirring at 45° C. for 4.5 hours, precipitating with ethanol, centrifuging, washing, and drying to obtain modified dextran;

[0089] (2) dissolving the modified dextran in 250 parts of dimethyl sulfoxide, then dissolving 8.3 parts of 2,2'-benzidine disulfonic acid in 15 parts of dimethyl sulfoxide and adding the mixture, and dissolving 3.4 parts of o-cresyl glycidyl ether in 8 parts of dimethyl sulfoxide and adding the mixture, stirring the mixture at 50° C. for 4 hours, discharging the mixture, washing the mixture with warm water, and drying the mixture to obtain an organic skeleton polymer;

[0090] (3) The organic skeleton polymer is uniformly mixed with 20 parts of blast furnace slag and 6 parts of gypsum to obtain a road soil stabilizer.

[0091] Example 3

[0092] The present embodiment provides a road soil stabilizer, whose raw materials include 82 parts of dextran, 23 parts of epichlorohydrin, 46.5 parts of 2,2'-benzidine disulfonic acid, 19.0 parts of phenyl glycidyl ether, 85 parts of blast furnace slag and 50 parts of gypsum, in parts by weight.

[0093] Among them, the mass ratio of dextran to epichlorohydrin is 1:0.28, the mass ratio of blast furnace slag to gypsum is 1:0.59, the average particle size of blast furnace slag is 30 μm, and the average particle size of gypsum is 15 μm.

[0094] The preparation method of the road soil stabilizer provided in this embodiment comprises the following steps:

[0095] (1) adding 82 parts of dextran to 3000 parts of a 0.9 mol / L sodium hydroxide solution, stirring until completely dissolved, then adding 23 parts of epichlorohydrin, stirring at 60° C. for 2 h, precipitating with ethanol, centrifuging, washing, and drying to obtain modified dextran;

[0096] (2) dissolving the modified dextran in 800 parts of dimethyl sulfoxide, then dissolving 46.5 parts of 2,2'-benzidine disulfonic acid in 80 parts of dimethyl sulfoxide and adding the mixture, and dissolving 19 parts of phenyl glycidyl ether in 30 parts of dimethyl sulfoxide and adding the mixture, stirring the mixture at 70° C. for 2 h, discharging the mixture, washing the mixture with warm water, and drying the mixture to obtain an organic skeleton polymer;

[0097] (3) The organic skeleton polymer is mixed evenly with 135 parts of solid waste filler to obtain a road soil stabilizer.

[0098] Example 4

[0099] This embodiment provides a road soil stabilizer, which is different from the embodiment 1 in that: by weight, the raw materials include 46 parts of dextran, 3 parts of epichlorohydrin, 23 parts of 2,2'-benzidine disulfonic acid, 9.5 parts of phenyl glycidyl ether, 45 parts of blast furnace slag and 23 parts of gypsum. The mass ratio of dextran to epichlorohydrin is 1:0.065.

[0100] Example 5

[0101] This embodiment provides a road soil stabilizer, which is different from the embodiment 1 in that: by weight, the raw materials include 33 parts of dextran, 16 parts of epichlorohydrin, 23 parts of 2,2'-benzidine disulfonic acid, 9.5 parts of phenyl glycidyl ether, 45 parts of blast furnace slag and 23 parts of gypsum. The mass ratio of dextran to epichlorohydrin is 1:0.48.

[0102] With reference to the data in Table 1, the difference between Example 1, Example 4 and Example 5 is that the mass ratio of dextran to epichlorohydrin is adjusted:

[0103] Example 4 Compared with Example 1, the bearing capacity and frost resistance of the soil are reduced. The reasons may be that: the amount of epichlorohydrin used is relatively small, the epoxy active sites provided for glucan are relatively few, that is, the modified glucan accounts for a low proportion, the linked aminosulfonic acid and glycidyl ether are reduced, affecting the hydrophobic effect, the cohesion between soil particles is reduced, and the constructed organic skeleton polymer is dispersed thinly in the entire soil system, which cannot provide a good internal support for the soil system, affecting the dispersion and absorption of external stress. In addition, the grafted sulfonic acid group with good complexing effect on metal ions is reduced, which is not conducive to the complexing of heavy metal ions, so the soil bearing capacity and frost resistance are reduced.

[0104] Compared with Example 1, the bearing capacity and frost resistance of the soil in Example 5 are reduced. The reason may be that: due to the reduction in the content of glucan, the hydrophilic end of the organic skeleton polymer may account for a small proportion, and the water film on the surface of the soil particles cannot be fully destroyed. The interface adhesion also decreases with the reduction of the glucan content, resulting in a decrease in the aggregation between the soil particles and a deterioration in the internal structure and density of the soil. At the same time, the reduction of glucan significantly reduces the hydroxyl content in the stabilizer, and the complexing effect on soil heavy metal ions is also reduced, and the soil density is reduced, which leads to a decline in the bearing capacity and frost resistance of the soil. However, since the hydrophilic and water absorption effects of glucan can be appropriately compensated by the gypsum in the system, the decline is not as obvious as in Example 4.

[0105] Example 6

[0106] This embodiment provides a road soil stabilizer, which is different from the embodiment 1 in that: by weight, the raw materials include 40 parts of dextran, 9 parts of epichlorohydrin, 23 parts of 2,2'-benzidine disulfonic acid, 9.5 parts of phenyl glycidyl ether, 58 parts of blast furnace slag and 10 parts of gypsum. The mass ratio of blast furnace slag to gypsum is 1:0.17.

[0107] Example 7

[0108] This embodiment provides a road soil stabilizer, which is different from the embodiment 1 in that: by weight, the raw materials include 40 parts of dextran, 9 parts of epichlorohydrin, 23 parts of 2,2'-benzidine disulfonic acid, 9.5 parts of phenyl glycidyl ether, 38 parts of blast furnace slag and 30 parts of gypsum. The mass ratio of blast furnace slag to gypsum is 1:0.79.

[0109] Combined with the data in Reference Table 1, the difference between Example 1, Example 6 and Example 7 is that the mass ratio of blast furnace slag to gypsum in the solid waste seasoning is adjusted:

[0110] Compared with Example 1, the bearing capacity and frost resistance of the soil in Example 6 are reduced. The reasons may be that: the gypsum content is low, which leads to poor water absorption of the soil stabilizer and reduced interfacial adhesion between soil particles. At the same time, less gypsum cannot form a good grading relationship with blast furnace slag to fill soil pores and optimize the internal structure and soil density of the soil, so the soil bearing capacity and frost resistance are reduced.

[0111] Compared with Example 1, the bearing capacity and frost resistance of the soil in Example 7 are reduced. The reason may be that: the gypsum content is relatively high. Although it brings better water absorption and interfacial adhesion to the soil system, it also produces the side effect of volume expansion, resulting in the deterioration of the internal structure of the soil. Therefore, the later bearing capacity and frost resistance of the soil are reduced.

[0112] Example 8

[0113] This embodiment provides a road soil stabilizer, which is different from Embodiment 1 in that 2,5-diaminophenyl-1,3-disulfonic acid is used instead of 2,2'-benzidine disulfonic acid.

[0114] Combined with the data in Reference Table 1, the reason why various properties of Example 8 are reduced compared with Example 1 may be that: compared with 2,2'-benzidine disulfonic acid, 2,5-diaminophenyl-1,3-disulfonic acid has a larger steric hindrance in its structure, and a lower bonding rate between primary amine and epoxy group, resulting in a loose structure of the organic skeleton polymer formed later and a reduction in the benzene ring structure. The structural support for the soil is not as good as in Example 1, and the external stress cannot be dispersed and absorbed in time, so the bearing capacity of the soil is reduced.

[0115] Example 9

[0116] This embodiment provides a road soil stabilizer, which is different from Embodiment 1 in that (R)-glycidyl methyl ether is used instead of phenyl glycidyl ether.

[0117] Compared with Example 1, the performance of Example 9 is reduced. The possible reason is that: the (R)-glycidyl methyl ether structure does not contain a benzene ring, the rigidity of the constructed organic skeleton polymer is reduced, and its internal support for the soil is reduced compared with Example 1, and the hydrophobicity is poor, which is not conducive to the aggregation of soil particles, so the soil bearing capacity and antifreeze performance are reduced.

[0118] Comparative Example 1

[0119] The soil stabilizer provided in this comparative example is different from the soil stabilizer in Example 1 in that no dextran is added, and the other raw materials and weight parts are the same. The preparation method of the soil stabilizer is as follows: (1) 9 parts of epichlorohydrin are dissolved in 500 parts of dimethyl sulfoxide, and then 23 parts of 2,2'-benzidine disulfonic acid are dissolved in 40 parts of dimethyl sulfoxide and added thereto, and 9.5 parts of phenyl glycidyl ether is dissolved in 15 parts of dimethyl sulfoxide and added thereto, and stirred at 60°C for 3 hours, discharged, washed with warm water, and dried to obtain an organic skeleton polymer; (2) the organic skeleton polymer is uniformly mixed with 45 parts of blast furnace slag and 23 parts of gypsum to obtain a road soil stabilizer.

[0120] Combined with the data in Reference Table 1, the reason why the various properties of the soil in Comparative Example 1 are significantly reduced compared with Example 1 may be that: due to the lack of the participation of glucan in the soil system, on the one hand, the hydrophilicity and water absorption of the soil stabilizer in Comparative Example 1 deteriorate, the interfacial adhesion is reduced, and the amphiphilic organic skeleton polymer cannot be formed, resulting in insufficient damage to the water film on the surface of the soil particles, reduced cohesion of the soil particles, deterioration of the internal structure, and reduced density, which affects the soil bearing capacity and frost resistance; on the other hand, the loss of a large number of hydroxyl active groups leads to the weakening of the ability of the stabilizer to complex the unstable heavy metal ions in the soil, the soil density is reduced, and the frost resistance of the soil is further deteriorated. At the same time, due to the lack of glucan, the organic skeleton polymer cannot be constructed in the system, the supporting force of the internal structure of the soil is significantly reduced, and the solidified soil is prone to cracking due to external stress concentration during use, and the soil bearing capacity is further reduced.

[0121] Comparative Example 2

[0122] The soil stabilizer provided in this comparative example is different from the soil stabilizer in Example 1 in that epichlorohydrin is not added, and the other raw materials and weight parts are the same. The preparation method of the soil stabilizer is as follows: (1) 40 parts of dextran are dissolved in 500 parts of dimethyl sulfoxide, and then 23 parts of 2,2'-benzidine disulfonic acid are dissolved in 40 parts of dimethyl sulfoxide and added thereto, and 9.5 parts of phenyl glycidyl ether is dissolved in 15 parts of dimethyl sulfoxide and added thereto, and stirred at 60°C for 3 hours, discharged, washed with warm water, and dried to obtain an organic skeleton polymer; (2) the organic skeleton polymer is uniformly mixed with 45 parts of blast furnace slag and 23 parts of gypsum to obtain a road soil stabilizer.

[0123] Combined with the data in Reference Table 1, the reason why the various properties of the soil in Comparative Example 2 are significantly reduced compared with Example 1 may be that: since epichlorohydrin is not added in Comparative Example 2, the stabilizer system of Comparative Example 2 cannot provide epoxy active sites for glucan that can react with aminosulfonic acid, and it is difficult to graft glycidyl ether to construct an organic skeleton polymer; although the hydroxyl groups on glucan can react with aminosulfonic acid, the reaction requirements of amino groups and hydroxyl groups are higher. Under this reaction condition, the two react insufficiently, which is not conducive to forming a stable structure with one end hydrophilic and the other end hydrophobic, and cannot improve the impermeability of soil particles, which is not conducive to improving the cohesion of soil particles, affecting the internal structure of the soil, and reducing the soil density, so the bearing capacity and frost resistance of the soil are reduced; in addition, when the grafting of glucan and glycidyl ether cannot be effectively achieved, the lack of organic skeleton polymer inside the soil will affect the good absorption and diffusion of external stress, so the soil bearing capacity is further reduced.

[0124] Comparative Example 3

[0125] The soil stabilizer provided in this comparative example is different from the soil stabilizer in Example 1 in that p-aminobenzenesulfonic acid is used instead of 2,2'-benzidine disulfonic acid, and the remaining raw materials and weight proportions are the same. The preparation method of the soil stabilizer is the same as that of Example 1.

[0126] Combined with the data in Reference Table 1, the reason why the various properties of the soil in Comparative Example 3 are significantly reduced compared with Example 1 may be that: Comparative Example 3 uses p-aminobenzenesulfonic acid instead of 2,2'-benzidine disulfonic acid. There is only one primary amine group in the structure of p-aminobenzenesulfonic acid. On the one hand, it can only be grafted on the modified dextran or glycidyl ether unilaterally, and it is impossible to construct an organic skeleton polymer with one end hydrophilic and the other end hydrophobic, and it cannot effectively destroy the water film on the surface of soil particles and improve the impermeability of soil particles. It is difficult to increase the aggregation of soil particles, the internal structure of the soil deteriorates, and the density decreases, which is not conducive to the improvement of soil bearing capacity and frost resistance. On the other hand, the lack of organic skeleton polymers causes the soil to lose its strong support structure, resulting in a further decrease in soil bearing capacity.

[0127] Comparative Example 4

[0128] The soil stabilizer provided in the comparative example is different from the soil stabilizer in Example 1 in that triethylenetetramine is used instead of 2,2'-benzidine disulfonic acid, and the other raw materials and weight proportions are the same. The preparation method of the soil stabilizer is the same as that of Example 1.

[0129] Combined with the data in Reference Table 1, the reason why the various properties of the soil in Comparative Example 4 are significantly reduced compared with Example 1 may be that: Triethylenetetramine is used to replace 2,2'-benzidine disulfonic acid in Comparative Example 4. There is no sulfonic acid group in the structure of triethylenetetramine, and the overall steric hindrance is small, resulting in disordered stacking of the side chains in the organic skeleton polymer. At the same time, it cannot form a stable complex with metal ions, and the internal structure and density of the soil are deteriorated, so the soil bearing capacity and frost resistance are reduced.

[0130] Performance Test:

[0131] Take an air-dried soil sample from a certain area in Suzhou City, add the road soil stabilizer prepared in each embodiment and comparative example at 4% of the weight of the soil, mix evenly, add water to make the soil moisture content of 15%, and after sufficient stirring, make a cylindrical sample of Φ150mm×H150mm, demold, and perform standard maintenance. According to JTG3441-2024 "Test Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering", the unconfined compressive strength of the sample aged 7 days and the sample aged 28 days and the frost resistance of the sample aged 28 days are tested respectively.

[0132] The test results are as follows:

[0133] Table 1 Test results of various embodiments and comparative examples

[0134]

[0135] The soil stabilizer provided by the present invention is not limited to being used in road construction, but can also be used to achieve similar effects in various soil treatment and stabilization situations, such as in the construction of closed parking lots, driveways, airports, airstrips, auxiliary roads, playgrounds, tennis courts, dams, embankments, etc.

[0136] Although the preferred embodiments of the present invention have been disclosed as above, they are not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the contents of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A road soil stabilizer, characterized in that: Calculated by weight, the raw materials include 10 to 85 parts of dextran, 2 to 25 parts of halogenated epoxy compounds, 5 to 50 parts of aminosulfonic acid, 2 to 20 parts of glycidyl ether, and 20 to 150 parts of solid waste filler.

2. The road soil stabilizer according to claim 1, characterized in that: Calculated by weight, the raw materials include 14 to 82 parts of dextran, 2 to 23 parts of halogenated epoxy compounds, 8 to 47 parts of aminosulfonic acid, 3 to 19 parts of glycidyl ether, and 26 to 135 parts of solid waste filler.

3. The road soil stabilizer according to claim 1, characterized in that: The halogenated epoxy compound is one or more of epichlorohydrin, epichlorohydrin, epibromohydrin and epibromobutylene.

4. The road soil stabilizer according to claim 1, characterized in that: The mass ratio of the dextran to the halogenated epoxy compound is 1:(0.05-0.5); preferably, the mass ratio of the dextran to the halogenated epoxy compound is 1:(0.1-0.3).

5. The road soil stabilizer according to claim 1, characterized in that: The aminosulfonic acid is at least one of 2,2'-benzidine disulfonic acid, 4,4'-diaminostilbene-2,2'-disulfonic acid, m-phenylenediamine-4,6-disulfonic acid, 2,5-diaminophenyl-1,3-disulfonic acid, and 2,5-diaminobenzene-1,4-disulfonic acid.

6. The road soil stabilizer according to claim 1, characterized in that: The glycidyl ether is at least one of phenyl glycidyl ether, o-cresyl glycidyl ether, p-sec-butylphenol glycidyl ether, glycidyl methyl ether, ethyl glycidyl ether, butyl glycidyl ether, and isopropyl glycidyl ether.

7. The road soil stabilizer according to claim 1, characterized in that: The solid waste filler is at least one of blast furnace slag, fly ash, gypsum, steel slag and fly ash.

8. The road soil stabilizer according to claim 1, characterized in that: The solid waste filler is a mixture of blast furnace slag and gypsum, and the mass ratio of blast furnace slag to gypsum is 1: (0.1-1.0); preferably, the mass ratio of blast furnace slag to gypsum is 1: (0.3-0.6).

9. The road soil stabilizer according to claim 7 or 8, characterized in that: The average particle size of the blast furnace slag is 15 to 45 μm, and the average particle size of the gypsum is 5 to 35 μm.

10. A method for preparing a road soil stabilizer as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: (1) adding dextran to a sodium hydroxide solution, stirring until completely dissolved, then adding a halogenated epoxy compound, stirring fully at 40 to 60° C. for 2 to 5 hours, precipitating with ethanol, centrifuging, washing, and drying to obtain a modified dextran; (2) dissolving the modified dextran in dimethyl sulfoxide, then adding aminosulfonic acid and glycidyl ether dissolved in dimethyl sulfoxide, stirring at 50 to 70° C. for 2 to 5 hours, discharging, washing with warm water, and drying to obtain an organic skeleton polymer; (3) The organic skeleton polymer and the solid waste filler are mixed evenly to obtain the road soil stabilizer.

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