Soil solidifying agent and its preparation method and application

Abstract

The present application belongs to the technical field of soil improvement, and relates to a soil solidifier, and a preparation method and application thereof. The present application prepares a soil solidifier by using an impact-resistant mixed additive composed of humic acid, an initiator, butyl acrylate, styrene, acrylic acid, an emulsifier and a surfactant, and a reinforcing agent composed of a mixture of industrial solid waste particles, a silicate, a water reducer, an anti-cracking agent, an anti-freeze-thaw compound mixed powder, lime and gypsum, and adds the soil solidifier to the road soil to improve the compressive strength and freeze-thaw fatigue resistance of the road soil, prevent seasonal freeze-thaw of the road soil, and thus improve the safety of seasonal freeze-thaw roads. The product components are stable, and the storage and transportation capacity of the solidifier in the present application are also improved, so that the soil solidifier has a better application prospect.

Description

Technical Field

[0001] The present application relates to the technical field of soil improvement, and in particular to a soil solidifying agent and a preparation method and application thereof. Background Art

[0002] Seasonal frozen soil generally refers to the soil (rock) on the surface that freezes in winter and completely melts in summer, including the seasonal frozen layer and the seasonal thawing layer (also called the active layer). The freeze-thaw cycle in the seasonal frozen soil area has a significant impact on the quality of road engineering. Its seasonal freezing and thawing process leads to a decrease in the strength of the roadbed during the spring thaw period. With global warming, part of the permafrost will turn into seasonal frozen soil, resulting in a continuous increase in the area of ​​seasonal frozen soil.

[0003] Mining roads located in seasonally frozen areas not only face seasonal freeze-thaw problems, but also face huge impacts from heavy-loaded vehicles. In the existing technology, many curing agents have poor impact resistance or freeze-thaw resistance, or cannot meet the requirements at the same time. When used on mining roads in high-cold areas, the spring thaw period may cause unexpected situations and affect safety. Summary of the invention

[0004] In view of this, the present application provides a soil solidifier and its preparation method and application to solve the problem that the soil solidifier in the prior art has poor impact resistance or freeze-thaw resistance, or cannot have both impact resistance and freeze-thaw resistance. Especially when used on roads in high-cold mining areas, the road soil will freeze and thaw seasonally, reducing the quality of road use. The passage of heavy-loaded vehicles during the spring thaw period may cause accidents, affecting safety during use.

[0005] In a first aspect, the present application provides a soil solidifier having excellent compressive strength and freeze-thaw fatigue resistance.

[0006] The soil solidifying agent is composed of an impact-resistant mixed additive and a reinforcing agent;

[0007] The impact-resistant mixed additive comprises the following components by weight: 200-220 parts of humic acid, 15-20 parts of initiator solution, 480-520 parts of butyl acrylate, 100-120 parts of styrene, 20-40 parts of acrylic acid, 8-15 parts of emulsifier and 3-5 parts of surfactant;

[0008] Preferably, the impact-resistant mixed additive further comprises deionized water, and the amount of the deionized water added is 150-170 parts;

[0009] The reinforcing agent comprises the following components by weight: 500-700 parts of industrial solid waste slag particle mixture, 20-50 parts of silicate, 10-15 parts of water reducing agent, 20-30 parts of anti-cracking agent, 20-25 parts of anti-freeze-thaw compound mixed powder, 15-20 parts of lime and 30-75 parts of gypsum.

[0010] In an optional embodiment, the enhancer satisfies any one or more of the following AD:

[0011] A: The anti-cracking agent is composed of 80-120 parts by weight of glass fiber powder, 100-120 parts by weight of calcium carbonate and 50 parts by weight of ethanol;

[0012] B: The anti-freeze-thaw composite mixed powder comprises the following raw materials: 15-25 parts by weight of ammonium chloride, 120-180 parts by weight of aqueous epoxy resin solution, 80-120 parts by weight of waste asphalt and 30-50 parts by weight of anionic emulsifier granular powder;

[0013] C: The industrial solid waste slag particle mixture is one or more of metallurgical waste slag, mining waste slag, fuel waste slag and chemical waste slag;

[0014] Preferably, the water content of the industrial solid waste slag particle mixture is less than 1wt%;

[0015] More preferably, the specific surface area of ​​the industrial solid waste slag particle mixture is 500-600m 2 / kg;

[0016] D: The water reducer is one or more of aminosulfonate-based high-efficiency water reducer, powdered polycarboxylate and naphthalenesulfonate water reducer.

[0017] In an optional embodiment, in the impact-resistant mixed additive,

[0018] The initiator solution is an APS aqueous solution, preferably with an APS content of 55-65wt.%;

[0019] And / or, the emulsifier is DNS-86.

[0020] In a second aspect, the present application provides a method for preparing the soil solidifying agent, the method comprising the following steps:

[0021] S1: mixing butyl acrylate, styrene and acrylic acid to form a mixture A;

[0022] S2: adding the mixture A obtained in step S1 dropwise to a mixture containing an emulsifier DNS-86 and a surfactant to form a pre-emulsion B;

[0023] S3: adding humic acid, deionized water and initiator solution to the pre-emulsion B obtained in step S2 to form an impact-resistant mixed additive;

[0024] S4: stirring and mixing all the raw materials of the impact-resistant mixed additive and the reinforcing agent obtained in step S3 to obtain the soil solidifying agent;

[0025] Preferably, the stirring and mixing speed is 295 r / min, and the stirring time is 80 min.

[0026] In an optional embodiment, in step S3, humic acid and deionized water are first added to the pre-emulsion B, stirred and heated to 60-78° C., and the initiator solution is added dropwise while stirred and heated to 83-87° C. After the addition is completed, stirring is continued to raise the temperature to 90-94° C. and the reaction is continued before filtering to form an impact-resistant mixed additive;

[0027] Preferably, the temperature is raised to 60-78°C at a rate of 1-3°C per minute by stirring; optionally, the temperature is raised to 60-78°C at a rate of 2°C per minute by stirring;

[0028] More preferably, the time for adding the initiator solution dropwise is 2-3 hours;

[0029] In an optional embodiment, the temperature is raised to 90-94° C. and the reaction is continued for 25-35 minutes; then the temperature is lowered to 70-74° C. and kept warm for 25-35 minutes, and finally cooled and filtered;

[0030] Preferably, the filtration is performed using a filter membrane with a pore size of 60-80 mesh;

[0031] More preferably, the cooling is to 20-30°C.

[0032] In an optional embodiment, the pH of the pre-emulsion B is 8-9;

[0033] Optionally, an alkaline regulator is used to adjust the pH of pre-emulsion B;

[0034] Optionally, the alkaline regulator is a saturated sodium hydroxide solution.

[0035] In an optional embodiment, the reinforcing agent includes a mixture of industrial solid waste slag particles, silicate, water reducing agent, anti-cracking agent, anti-freeze-thaw compound mixed powder, lime and gypsum;

[0036] The preparation method of the freeze-thaw-resistant composite mixed powder comprises: mixing ammonium chloride, water-based epoxy resin solution, waste asphalt and anionic emulsifier particle powder and reacting at 150-200° C. for 3-5 hours to obtain the obtained powder;

[0037] and / or, the industrial solid waste residue particle mixture is ground before being added;

[0038] Preferably, the grinding is performed to a specific surface area of ​​500-600 m 2 / kg, grinding time is 110-130min;

[0039] More preferably, the silicate, water reducing agent, anti-cracking agent, antifreeze-thaw compound mixed powder, lime and gypsum are also ground before use.

[0040] In a third aspect, the present application provides an application of the soil solidifier in road engineering.

[0041] In an optional embodiment, the road is a mining road in a high-altitude and cold region.

[0042] In a fourth aspect, the present application provides a pavement base material, wherein the pavement base material comprises the soil curing agent, and the addition amount of the soil curing agent is 4-6% of the weight of the pavement base material.

[0043] Beneficial effects of this application:

[0044] The present application prepares a soil solidifier by using an impact-resistant mixed additive composed of humic acid, an initiator, butyl acrylate, styrene, acrylic acid, an emulsifier and a surfactant and a reinforcing agent composed of a mixture of industrial solid waste particles, a silicate, a water reducer, an anti-cracking agent, an anti-freeze-thaw compound mixed powder, lime and gypsum, and adds it to the road soil to improve the compressive strength and freeze-thaw fatigue resistance of the road soil, prevent seasonal freeze-thaw of the road soil, and thus improve the safety of seasonal freeze-thaw roads. The product components are stable, and the storage and transportation capacity of the curing agent in the present application are also improved, so that the present soil solidifier has a better application prospect. DETAILED DESCRIPTION

[0045] The following examples are provided for a better understanding of the present application, but are not limited to the best implementation mode described, and do not limit the content and protection scope of the present application. Any product identical or similar to the present application obtained by anyone under the inspiration of the present application or by combining the features of the present application with other prior arts shall fall within the protection scope of the present application.

[0046] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0047] In the present application, the selection scope involving "and / or" includes any one of two or more related listed items, and also includes any and all combinations of the related listed items. For example, "A and / or B" includes three parallel options of A, B and A+B.

[0048] In the present application, "multiple" or "multiple" means, unless otherwise specified, that the number is greater than or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0049] In the present application, the terms “further”, “furthermore”, “particularly”, etc. are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present application.

[0050] In this application, "optionally", "optional" and "optional" refer to optional, that is, to any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0051] In this application, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0052] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0053] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0054] When using roads in high-cold mining areas, the road soil will freeze and thaw seasonally, reducing the quality of road use. Heavy-loaded vehicles passing through during the spring thaw period may cause accidents and affect the safety of use. In order to avoid seasonal freezing and thawing of road soil, the present application provides a soil solidifier.

[0055] In some specific embodiments, a soil stabilizer is composed of an impact-resistant mixing additive and a reinforcing agent;

[0056] The impact-resistant mixed additive comprises the following components by weight: 200-220 parts of humic acid, 15-20 parts of initiator solution, 480-520 parts of butyl acrylate, 100-120 parts of styrene, 20-40 parts of acrylic acid, 8-15 parts of emulsifier and 3-5 parts of surfactant;

[0057] The impact-resistant mixed additive is composed of humic acid, initiator, butyl acrylate, styrene, acrylic acid, emulsifier and surfactant; the humic acid in the present application is extracted from lignite according to conventional methods, illustratively, the lignite is ground into powder, then extracted with alkaline or acidic solution, and after repeated extraction, concentration and drying, humic acid is finally obtained. The surfactant is specifically a polymerizable surfactant with emulsification function, illustratively, the surfactant can be ANPEO10 or ANPEO10-P1, preferably ANPEO10.

[0058] Preferably, the impact-resistant mixed additive further comprises deionized water, and the amount of the deionized water added is 150-170 parts;

[0059] The reinforcing agent comprises the following components by weight: 500-700 parts of industrial solid waste slag particle mixture, 20-50 parts of silicate, 10-15 parts of water reducing agent, 20-30 parts of anti-cracking agent, 20-25 parts of anti-freeze-thaw compound mixed powder, 15-20 parts of lime and 30-75 parts of gypsum.

[0060] The reinforcing agent consists of a mixture of industrial solid waste slag particles, silicate, a water reducing agent, an anti-cracking agent, an anti-freezing and thawing compound mixed powder, lime and gypsum.

[0061] The present application prepares a soil solidifier by using an impact-resistant mixed additive composed of humic acid, an initiator, butyl acrylate, styrene, acrylic acid, an emulsifier and a surfactant and a reinforcing agent composed of a mixture of industrial solid waste particles, a silicate, a water reducer, an anti-cracking agent, an anti-freeze-thaw compound mixed powder, lime and gypsum, and adds it to the road soil to improve the compressive strength and freeze-thaw fatigue resistance of the road soil, prevent seasonal freeze-thaw of the road soil, and thus improve the safety of seasonal freeze-thaw roads. The product components are stable, and the storage and transportation capacity of the curing agent in the present application are also improved, so that the present soil solidifier has a better application prospect.

[0062] In the present application, the impact-resistant mixed additive selects acrylic acid and acrylic esters as monomers and carries out graft copolymerization reaction with the natural product humic acid to prepare a polymer graft copolymer emulsion with a cross-linked network structure. After the emulsion is mixed with raw materials such as industrial solid waste, the prepared soil solidifier has excellent dynamic stability and is evenly dispersed, so that the soil solidifier is relatively stable as a whole during subsequent use, and will not easily break or crack when heavy vehicles pass by on the road, thereby increasing the overall firmness and impact resistance of the soil solidifier.

[0063] The reinforcing agent is selected from a mixture of industrial solid waste particles, silicate, water reducer, anti-cracking agent, freeze-thaw resistance compound mixed powder, lime and gypsum. The freeze-thaw resistance and bonding properties of the freeze-thaw resistance compound mixed powder are used to make the network structure of the impact-resistant mixed additive more solid; and by using it together with the water reducer and anti-cracking agent, the industrial solid waste particle mixture and the impact-resistant mixed additive form a structure with a certain elasticity, and the particle size of lime, gypsum and the like different from that of the industrial solid waste particle mixture is used to form an elastic and stable soil solidifier structure.

[0064] In some embodiments, the enhancer satisfies any one or more of the following AD:

[0065] A: The anti-cracking agent is composed of 80-120 parts by weight of glass fiber powder, 100-120 parts by weight of calcium carbonate and 50 parts by weight of ethanol;

[0066] B: The anti-freeze-thaw composite mixed powder comprises the following raw materials: 15-25 parts by weight of ammonium chloride, 120-180 parts by weight of aqueous epoxy resin solution, 80-120 parts by weight of waste asphalt and 30-50 parts by weight of anionic emulsifier granular powder;

[0067] C: The industrial solid waste slag particle mixture is one or more of metallurgical waste slag, mining waste slag, fuel waste slag and chemical waste slag;

[0068] Preferably, the water content of the industrial solid waste slag particle mixture is less than 1wt%;

[0069] More preferably, the specific surface area of ​​the industrial solid waste slag particle mixture is 500-600m 2 / kg;

[0070] D: The water reducer is one or more of aminosulfonate-based high-efficiency water reducer, powdered polycarboxylate and naphthalenesulfonate water reducer.

[0071] The anti-freeze-thaw compound mixed powder of the present application selects ammonium chloride, water-based epoxy resin solution, waste asphalt and anionic emulsifier granular powder as raw materials, and adds water-based epoxy emulsified hot waste asphalt as the anti-freeze-thaw compound mixed powder on the basis of the impact-resistant mixed additive, so that the soil solidifier relies on the hot waste asphalt, the excellent low-temperature performance and the excellent bonding strength of the epoxy emulsion, so that the soil solidified material has better compressive strength and freeze-thaw fatigue resistance, so that freeze-thaw phenomenon will not easily occur, further increasing the stability of the curing agent during use.

[0072] The waterborne epoxy resin solution of the present application has a solid content of 48-52 wt.%, epoxy equivalent (solid content): 220-280; viscosity (25°C): 100-450 mPa·s; pH value: 2-7; specific gravity: 1.01-1.08. The waste asphalt is asphalt concrete waste; the anionic emulsifier granular powder may include sodium oleate, sodium rosinate, sodium laurate and / or sodium cyclopentaneate;

[0073] In some embodiments, the impact-resistant mixed additive includes:

[0074] The initiator solution may be an aqueous solution of ammonium persulfate, an aqueous solution of sodium persulfate or an aqueous solution of potassium persulfate, preferably an aqueous solution of ammonium persulfate (APS), wherein the content of APS in the aqueous solution of ammonium persulfate is 55-65wt.%;

[0075] And / or, the emulsifier is DNS-86 or ANPEO10-P1, preferably DNS-86.

[0076] Ammonium persulfate (APS for short, trade name ammonium persulfate) is a crystalline salt of peroxydisulfuric acid, a strong oxidant and initiator for polymerization reactions.

[0077] The surfactant and emulsifier DNS-86 in this application were purchased from Hanke Chemical Technology Co., Ltd.

[0078] Aminosulfonic acid-based high-efficiency water reducer (ASP for short) has a strong water-reducing and dispersing effect, which can ensure that concrete can still maintain good workability at a low water-cement ratio. Therefore, aminosulfonic acid-based high-efficiency water reducer has a higher water-reducing rate and a stronger dispersing effect than naphthalene-based and melamine-based water reducers. ASP can significantly reduce the slump loss of the pavement.

[0079] In some embodiments, a method for preparing the soil solidifying agent is provided, the method comprising the following steps:

[0080] S1: mixing butyl acrylate, styrene and acrylic acid to form a mixture A;

[0081] S2: adding the mixture A obtained in step S1 dropwise to a mixture containing an emulsifier DNS-86 and a surfactant to form a pre-emulsion B;

[0082] S3: adding humic acid, deionized water and initiator solution to the pre-emulsion B obtained in step S2,

[0083] Forming impact resistant mixed additives;

[0084] S4: stirring and mixing all the raw materials of the impact-resistant mixed additive and the reinforcing agent obtained in step S3 to obtain the soil solidifying agent;

[0085] Preferably, the stirring and mixing speed is 295 r / min, and the stirring time is 80 min.

[0086] If the mixing speed is too fast, the temperature will be too high, affecting the properties of the product. If the speed is too slow or the time is too short, the mixture cannot be mixed to a uniform state.

[0087] In some embodiments, in step S3, humic acid and deionized water are first added to the pre-emulsion B, and the temperature is raised to 60-78° C. by stirring, and the initiator solution is added dropwise while stirring and heating to 83-87° C. After the addition is completed, stirring and heating to 90-94° C. are continued, and the reaction is continued and then filtered to form an impact-resistant mixed additive;

[0088] Preferably, the temperature is raised to 60-78°C at a rate of 1-3°C per minute by stirring; optionally, the temperature is raised to 60-78°C at a rate of 1°C, 2°C or 3°C per minute by stirring;

[0089] More preferably, the time for adding the initiator solution dropwise is 2-3 hours;

[0090] In some embodiments, the temperature is raised to 90-94° C. and the reaction is continued for 25-35 minutes; then the temperature is lowered to 70-74° C. and kept warm for 25-35 minutes, and finally cooled and filtered;

[0091] Preferably, the filtration is performed using a filter membrane with a pore size of 0.125 mm;

[0092] More preferably, the cooling is to 20-30°C.

[0093] In some embodiments, the pH of the pre-emulsion B is 8-9;

[0094] Most anionic emulsifiers require to be used under alkaline conditions. pH is the most important factor affecting the emulsification effect. The appropriate pH value can improve the emulsification ability and reduce the dosage. The impact-resistant mixed additives should be filtered before use and then reacted with the enhancer to improve the initiation efficiency.

[0095] Optionally, an alkaline regulator is used to adjust the pH of pre-emulsion B;

[0096] Optionally, the alkaline regulator is a saturated sodium hydroxide solution.

[0097] In some embodiments, the reinforcing agent includes a mixture of industrial solid waste slag particles, silicate, water reducing agent, anti-cracking agent, anti-freeze-thaw compound mixed powder, lime and gypsum;

[0098] The preparation method of the freeze-thaw-resistant composite mixed powder comprises: mixing ammonium chloride, water-based epoxy resin solution, waste asphalt and anionic emulsifier particle powder and reacting at 150-200° C. for 3-5 hours to obtain the obtained powder;

[0099] and / or, the industrial solid waste residue particle mixture is ground before being added;

[0100] Preferably, the grinding is performed to a specific surface area of ​​500-600 m 2 / kg, grinding time is 110-130min;

[0101] More preferably, the silicate, water reducing agent, anti-cracking agent, antifreeze-thaw compound mixed powder, lime and gypsum are also ground before use to a specific surface area of ​​500-600m 2 / kg, particle size <50μm.

[0102] The particle size and dispersibility index of the raw materials of the present application are both relatively small, and large voids are not easily formed in the soil solidifier obtained after the reinforcing agent is mixed with the impact-resistant mixed additive, thereby improving the overall firmness and impact resistance of the soil solidifier.

[0103] In some embodiments, there is also provided an application of the soil solidifying agent in a road project, wherein the road is a mining road in a high-cold region.

[0104] In some embodiments, a pavement base material is further provided, the pavement base material includes the soil curing agent, and the addition amount of the soil curing agent is 4-6% of the weight of the pavement base material.

[0105] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0106] Example 1

[0107] This embodiment provides a soil solidifying agent, which is composed of an impact-resistant mixed additive and a reinforcing agent, including the following components:

[0108] The impact-resistant mixed additive is composed of 210 kg of peat humic acid, 18 kg of sodium persulfate aqueous solution (initiator), 500 kg of butyl acrylate, 110 kg of styrene, 30 kg of acrylic acid, 11 kg of DNS-86 (emulsifier), 160 kg of deionized water and 4 kg of ANPEO10-P1 (surfactant);

[0109] The reinforcing agent is composed of 600 kg of industrial solid waste slag particle mixture, 35 kg of silicate, 12.5 kg of water reducing agent, 25 kg of anti-cracking agent, 23 kg of anti-freeze-thaw compound mixed powder, 18 kg of lime and 55 kg of gypsum.

[0110] The anti-cracking agent powder preparation is composed of 100 kg of glass fiber powder, 110 kg of calcium carbonate and 50 kg of ethanol;

[0111] The freeze-thaw resistance compound mixed powder includes 20 kg of ammonium chloride powder preparation, 150 kg of room temperature water-based epoxy resin solution, 100 kg of hot waste asphalt and 40 kg of anionic emulsifier granular powder (sodium oleate).

[0112] The impact resistant admixture additive and the reinforcing agent are mixed to form a soil stabilizer.

[0113] Example 2

[0114] This embodiment provides a soil solidifying agent, which is composed of an impact-resistant mixed additive and a reinforcing agent, including the following components:

[0115] The impact-resistant mixed additive includes 200kg lignite humic acid and 150kg deionized water, 18kg initiator APS aqueous solution, 480kg butyl acrylate, 100kg styrene, 20kg acrylic acid; 8kg ANPEO10-P1 (emulsifier) ​​and 3kg ANPEO10 (surfactant);

[0116] The reinforcing agent includes: 500kg of industrial solid waste slag particle mixture, 20kg of silicate powder preparation, 10kg of water reducing agent, 20kg of anti-cracking agent powder preparation, 20kg of anti-freeze-thaw compound mixed powder, 15kg of lime fine powder and 30kg of block gypsum raw material;

[0117] The anti-cracking agent powder preparation is composed of 100 kg of glass fiber powder, 110 kg of calcium carbonate and 50 kg of ethanol;

[0118] The freeze-thaw resistance compound mixed powder includes 20 kg of ammonium chloride powder preparation, 150 kg of room temperature water-based epoxy resin solution, 100 kg of hot waste asphalt and 40 kg of anionic emulsifier granular powder (a mixture of sodium oleate, sodium rosin acid, sodium laurate and sodium cyclopentaneate).

[0119] Prepare the soil stabilizer as follows:

[0120] S1: First, prepare an impact-resistant mixed additive, weigh butyl acrylate, styrene and acrylic acid, and mix the weighed objects thoroughly to obtain a mixture A;

[0121] S2: Add mixture A dropwise to the second mixture containing emulsifier particle powder DNS-86 and ANPEO10, adjust the pH value to 8 using a pH adjuster, and then disperse it for 5 minutes using a handheld homogenizer to finally obtain a stable pre-emulsion B;

[0122] S3: Add humic acid and deionized water to the pre-emulsion B prepared in step S2, stir and heat, heat to 60°C at a rate of 2°C per minute, add 10 kg of initiator APS aqueous solution, continue stirring and heat to 78°C, then dropwise add the remaining initiator APS aqueous solution for 2 hours; continue stirring and heat to 85°C while dropping;

[0123] S4: After the dropwise addition is completed, the temperature is raised to 92° C. and the reaction is continued for 30 min, then the temperature is lowered to 72° C. and kept for 30 min, and the mixture is cooled to room temperature and filtered to obtain an impact-resistant mixed additive;

[0124] S5: Weigh the industrial solid waste slag particle mixture, silicate powder preparation, water reducer, anti-cracking agent powder preparation, antifreeze-thaw compound mixed powder, lime fine powder and block gypsum raw material;

[0125] S6: drying the industrial solid waste particles weighed in step S5 to make their moisture content less than 1%; grinding the silicate powder preparation, the water-reducing and drying compound preparation, the lime fine powder, the block gypsum raw material, the anti-cracking expansion powder compound preparation and the dried industrial solid waste particles, mixing them after the grinding, and then adding the other raw materials weighed in step S5 to the mixture, mixing them evenly to obtain the reinforcing agent;

[0126] S7: placing the impact-resistant mixed additive prepared in step S4 and the reinforcing agent prepared in step S6 in a mixer, and stirring and mixing them thoroughly to obtain a mixed soil solidifying agent;

[0127] S8: The soil solidifier prepared in step S7 is collected and preserved, so that the impact-resistant soil solidifier for roads in high-altitude mining areas can be prepared using industrial solid waste.

[0128] In step S2, the pH adjuster is a saturated sodium hydroxide solution at 20°C.

[0129] In step S5, the industrial solid waste slag particle mixture is a mixture of metallurgical waste slag and mining waste slag in equal proportions.

[0130] In step S5, the water reducing agent is an aminosulfonate-based high-efficiency water reducing agent.

[0131] In step S5, the preparation method of the freeze-thaw-resistant composite mixed powder is: weigh the stabilizer ammonium chloride powder preparation, the room temperature aqueous epoxy resin solution, the hot waste asphalt and the anionic emulsifier granular powder, place the weighed raw materials in a stirred reactor at 150-200°C for reaction for 3-5 hours to obtain the freeze-thaw-resistant composite mixed powder.

[0132] In step S6, the grinding time is 120 min, and the industrial waste slag is ground to a surface area of ​​550 m 2 / kg.

[0133] In step S7, during mixing and stirring, the stirring speed of the stirrer is controlled to be 295 r / min, and the stirring time is 80 min.

[0134] Example 3

[0135] This embodiment provides a soil solidifying agent, which is composed of an impact-resistant mixed additive and a reinforcing agent, including the following components:

[0136] The impact-resistant mixed additives include 220kg lignite humic acid and 150kg deionized water, 18kg potassium persulfate aqueous solution (initiator), 520kg butyl acrylate, 120kg styrene, 20kg acrylic acid; 15kg emulsifier DNS-86 and 5kg ANPEO10;

[0137] The reinforcing agent includes: 600kg of industrial solid waste slag particle mixture, 50kg of silicate powder preparation, 15kg of water reducing agent, 30kg of anti-cracking agent powder preparation, 25kg of anti-freeze-thaw compound mixed powder, 20kg of lime fine powder and 75kg of block gypsum raw material;

[0138] The anti-cracking agent powder preparation is composed of 100 kg of glass fiber powder, 110 kg of calcium carbonate and 50 kg of ethanol;

[0139] The freeze-thaw resistance compound mixed powder includes 20 kg of ammonium chloride powder preparation, 150 kg of room temperature water-based epoxy resin solution, 100 kg of hot waste asphalt and 40 kg of anionic emulsifier granular powder (a mixture of sodium oleate, sodium rosin acid, sodium laurate and sodium cyclopentaneate).

[0140] The method for preparing an impact-resistant soil solidifier for roads in high-cold mining areas using industrial solid waste comprises the following steps:

[0141] S1: First, prepare an impact-resistant mixed additive, weigh 40 kg of butyl acrylate, styrene and acrylic acid, and mix the weighed materials thoroughly to obtain a mixture A;

[0142] S2: Add dropwise to the emulsifier particle powder DNS-86 and ANPEO10, adjust the pH value to 9 with a pH adjuster, and then disperse for 5 minutes using a handheld homogenizer to finally obtain a stable pre-emulsion B;

[0143] S3: Add humic acid and 170 kg of deionized water to the pre-emulsion B prepared in step S2, stir and heat, add 20 kg of initiator APS aqueous solution, continue stirring and heat to 85° C., when the temperature is 78° C., dropwise add the remaining pre-emulsion and aqueous solution initiator component, the dropping time is 2-3 hours;

[0144] S4: After the dropwise addition is completed, the temperature is raised to 92° C. and the reaction is continued for 30 min, then the temperature is lowered to 72° C. and kept for 30 min, and the material is cooled, filtered and discharged to obtain an impact-resistant mixed additive;

[0145] S5: Weigh the industrial solid waste slag particle mixture, silicate powder preparation, water reducer, anti-cracking agent powder preparation, antifreeze-thaw compound mixed powder, lime fine powder and block gypsum raw material;

[0146] S6: drying the industrial solid waste slag particle mixture weighed in step S5 to make its moisture content less than 1%, and then grinding the silicate powder preparation, the water-reducing and drying compound mixed preparation, the lime fine powder, the block gypsum raw material, the anti-cracking expansion powder compound mixed preparation and the industrial waste slag, and after the grinding is completed, adding the remaining raw materials weighed in step S5 into it;

[0147] S7: placing the impact-resistant mixed additive prepared in step S4 and the raw material prepared in step S6 in a mixer, and stirring and mixing them thoroughly to obtain a mixed soil solidifying agent;

[0148] S8: The soil solidifier prepared in step S7 is collected and preserved, thereby completing the entire process of using industrial solid waste to prepare impact-resistant soil solidifier for roads in high-cold mining areas.

[0149] In step S2, the pH adjuster is a saturated sodium hydroxide solution at 20°C.

[0150] In step S3, during the stirring and heating process, the temperature is raised to 60°C at a rate of 2°C per minute.

[0151] In step S4, stirring is continued and the temperature is raised to 85°C. When the temperature is 78°C, the remaining pre-emulsion and aqueous solution initiator reagent components that have not been used up are simultaneously added dropwise for 2.5 hours. After the addition is completed, the temperature is raised to 92°C and the reaction is continued for 30 minutes. The room temperature is then lowered to 72°C and kept warm for 30 minutes. Finally, the mixture is cooled, filtered and discharged.

[0152] In step S5, the industrial solid waste slag particle mixture is a mixture of fuel waste slag and chemical waste slag in equal proportions.

[0153] In step S5, the water reducing agent is powdered polycarboxylate.

[0154] In step S5, the preparation method of the freeze-thaw-resistant composite mixed powder is: weigh the stabilizer ammonium chloride powder preparation, the room temperature aqueous epoxy resin solution, the hot waste asphalt and the anionic emulsifier granular powder, place the weighed raw materials in a stirred reactor at 150°C for 4 hours to react, and obtain the freeze-thaw-resistant composite mixed powder.

[0155] In step S6, the grinding time is 120 min, and the industrial waste slag is ground to a surface area of ​​550 m2 / kg.

[0156] In step S7, the speed of the stirrer during mixing and stirring is controlled at 295 r / min, and the stirring time is 80 min.

[0157] Example 4

[0158] This embodiment provides a soil solidifying agent, which is composed of an impact-resistant mixed additive and a reinforcing agent, including the following components:

[0159] The impact-resistant mixed additives include 210kg humic acid and 160kg deionized water, kg initiator APS aqueous solution, 500kg butyl acrylate, 100kg styrene, 30kg acrylic acid; 10kg emulsifier DNS-86 and 5kg ANPEO10;

[0160] The reinforcing agent includes: 650kg of industrial solid waste slag particle mixture, 40kg of silicate powder preparation, 14kg of water reducing agent, 20kg of anti-cracking agent powder preparation, 20kg of anti-freeze-thaw compound mixed powder, 15kg of lime fine powder and 70kg of block gypsum raw material;

[0161] The anti-cracking agent powder preparation is composed of kg of glass fiber powder, 110 kg of calcium carbonate and 50 kg of ethanol;

[0162] The freeze-thaw resistance compound mixed powder includes 20 kg of ammonium chloride powder preparation, 150 kg of room temperature water-based epoxy resin solution, 100 kg of hot waste asphalt and 40 kg of anionic emulsifier granular powder (a mixture of sodium oleate, sodium rosin acid, sodium laurate and sodium cyclopentaneate).

[0163] The method for preparing an impact-resistant soil solidifier for roads in high-cold mining areas using industrial solid waste comprises the following steps:

[0164] S1: First, prepare an impact-resistant mixed additive, weigh butyl acrylate, styrene and acrylic acid, and fully mix the weighed objects to obtain a mixture A;

[0165] S2: Add dropwise to a mixture containing emulsifier particle powder DNS-86 and ANPEO10, adjust the pH value to 9 using a pH adjuster, and disperse for 5 minutes using a handheld homogenizer to obtain a stable pre-emulsion B;

[0166] S3: Add humic acid and deionized water to the pre-emulsion B prepared in step S2, stir and heat, add the initiator APS aqueous solution, continue stirring and heat to 85°C; when the temperature is 78°C, simultaneously dropwise add the remaining pre-emulsion and aqueous solution initiator reagent components, and the dropping time is 2h;

[0167] S4: After the dropwise addition is completed, the temperature is raised to 92° C. and the reaction is continued for 30 min, then the temperature is lowered to 72° C. and kept for 30 min, and the material is cooled, filtered and discharged to obtain an impact-resistant mixed additive;

[0168] S5: Weigh the industrial solid waste slag particle mixture, silicate powder preparation, water reducer, anti-cracking agent powder preparation, antifreeze-thaw compound mixed powder, lime fine powder and block gypsum raw material;

[0169] S6: drying the industrial solid waste slag particle mixture weighed in step S5 to make its moisture content less than 1%, and then grinding the silicate powder preparation, the water-reducing and drying compound mixed preparation, the lime fine powder, the block gypsum raw material, the anti-cracking expansion powder compound mixed preparation and the industrial waste slag, and after the grinding is completed, adding the remaining raw materials weighed in step S5 into it;

[0170] S7: placing the impact-resistant mixed additive prepared in step S4 and the raw material prepared in step S6 in a mixer, and stirring and mixing them thoroughly to obtain a mixed soil solidifying agent;

[0171] S8: The soil solidifier prepared in step S7 is collected and preserved, thereby completing the entire process of using industrial solid waste to prepare impact-resistant soil solidifier for roads in high-cold mining areas.

[0172] In step S2, the pH adjuster is a saturated sodium hydroxide solution at 20°C.

[0173] In step S3, during the stirring and heating process, the temperature is raised to 60°C at a rate of 2°C / min.

[0174] In step S4, the temperature is raised to 85°C with continued stirring. When the temperature is 78°C, the remaining pre-emulsion and aqueous solution initiator component are added dropwise for 2 hours. After the addition is completed, the temperature is raised to 92°C and the reaction is continued for 30 minutes, then the temperature is lowered to 72°C and kept for 30 minutes, and the material is cooled, filtered and discharged.

[0175] In step S5, the industrial solid waste slag particle mixture is one or more of metallurgical waste slag, mining waste slag, fuel waste slag and chemical waste slag.

[0176] In step S5, the water reducing agent is one of aminosulfonate-based high-efficiency water reducing agent, powdered polycarboxylate and naphthalenesulfonate water reducing agent.

[0177] In step S5, the preparation method of the freeze-thaw-resistant composite mixed powder is as follows: weigh 20 kg of stabilizer ammonium chloride powder preparation, 150 kg of room temperature aqueous epoxy resin solution, 100 kg of hot waste asphalt and 40 kg of anionic emulsifier granular powder, place the weighed raw materials in a stirred reactor at 150-200°C for reaction for 3-5 hours, and obtain the freeze-thaw-resistant composite mixed powder.

[0178] In step S6, the grinding time is 120 min, and the industrial waste slag is ground to a surface area of ​​550 m 2 / kg.

[0179] In step S7, during mixing and stirring, the stirring speed of the stirrer is controlled to be 295 r / min, and the stirring time is 80 min.

[0180] Comparative Example 1

[0181] The soil solidifying agent was prepared according to the method of Example 4, except that the anti-freeze-thaw compound mixed powder was not added to the ingredients.

[0182] The impact-resistant mixed additive of this comparative example includes 210kg humic acid and 18160kg deionized water, kg initiator APS aqueous solution, 500kg butyl acrylate, 100kg styrene, 30kg acrylic acid; 10kg emulsifier granular powder DNS-86 and 5kg ANPEO10;

[0183] The reinforcing agent includes: 650 kg of industrial solid waste slag particle mixture, 40 kg of silicate powder preparation, 14 kg of water reducing agent, 20 kg of anti-cracking agent powder preparation, 15 kg of lime fine powder and 70 kg of block gypsum raw material.

[0184] Comparative Example 2

[0185] A soil stabilizer was prepared according to the method of Example 4, except that the anti-cracking agent powder preparation was not added to the composition.

[0186] The impact-resistant mixed additive of this comparative example includes 210kg humic acid and 18160kg deionized water, kg initiator APS aqueous solution, 500kg butyl acrylate, 100kg styrene, 30kg acrylic acid; 10kg emulsifier granular powder DNS-86 and 5kg ANPEO10;

[0187] The reinforcing agent includes: 650kg of industrial solid waste slag particle mixture, 40kg of silicate powder preparation, 14kg of water reducing agent, 20kg of anti-freeze-thaw compound mixed powder, 15kg of lime fine powder and 70kg of block gypsum raw material.

[0188] Comparative Example 3

[0189] This comparative example provides a common soil solidifying agent, which is prepared by dissolving water glass and lime in water to generate amorphous calcium silicate, and then adding sodium lignin sulfonate and mixing evenly. The mass ratio of water glass, lime and sodium lignin sulfonate is 0.6-1:1:1-6, wherein the modulus of water glass is 3.3-4.2.

[0190] The soil solidifiers prepared in Examples 1-4 and the soil solidifiers prepared in Comparative Examples 1-3 were respectively made into standard test pieces (according to JTG E51-2009 "Test Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering"), and then compared and analyzed. The results are shown in Tables 1, 2 and 3:

[0191] 1. Freeze-thaw resistance test results

[0192] Table 1 Freeze-thaw resistance test results

[0193]

[0194]

[0195] 2. Water stability test results

[0196] Table 2 Water stability test results

[0197] Serial number Water stability (KN) Water stability after 24h immersion (KN) Residual stability (%) Example 1 17.99 15.06 83.7 Example 2 17.67 14.99 84.8 Example 3 16.58 13.79 83.2 Example 4 17.61 14.98 85.1 Comparative Example 1 17.02 14.11 82.9 Comparative Example 2 16.81 13.81 82.2 Comparative Example 3 16.87 13.99 82.9

[0198] The results show that the water stability and freeze-thaw resistance of the test pieces after adding the soil solidifiers of Examples 1-4 of the present invention are better than those of the solidifiers of Comparative Examples 1-3, and the residual stability meets the requirements of the specification (greater than 80%).

[0199] 3. Low temperature performance test results

[0200] Table 3 Low temperature performance test results

[0201]

[0202] The results show that the soil solidifier specimens using Examples 1-4 of the present invention have certain improvements in flexural tensile strength, bending stiffness modulus, maximum deflection, and maximum bending-tensile strain, indicating that the soil solidifier component of the present invention can improve the performance of soil at low temperatures.

[0203] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims

1. A soil solidifying agent, characterized in that: The soil solidifying agent includes an impact-resistant mixing additive and a reinforcing agent; The impact-resistant mixed additive comprises the following components by weight: 200-220 parts of humic acid, 15-20 parts of initiator solution, 480-520 parts of butyl acrylate, 100-120 parts of styrene, 20-40 parts of acrylic acid, 8-15 parts of emulsifier, 3-5 parts of surfactant and 150-170 parts of deionized water; The reinforcing agent comprises the following components by weight: 500-700 parts of industrial solid waste slag particle mixture, 20-50 parts of silicate, 10-15 parts of water reducing agent, 20-30 parts of anti-cracking agent, 20-25 parts of anti-freeze-thaw compound mixed powder, 15-20 parts of lime and 30-75 parts of gypsum; The anti-cracking agent is composed of 80-120 parts by weight of glass fiber powder, 100-120 parts by weight of calcium carbonate and 50 parts by weight of ethanol; The freeze-thaw resistance composite mixed powder comprises the following raw materials: 15-25 parts by weight of ammonium chloride, 120-180 parts by weight of aqueous epoxy resin solution, 80-120 parts by weight of waste asphalt and 30-50 parts by weight of anionic emulsifier particle powder.

2. The soil solidifying agent according to claim 1, characterized in that: The industrial solid waste slag particle mixture is one or more of metallurgical waste slag, mining waste slag, fuel waste slag and chemical waste slag; And / or, the water reducer is one or more of aminosulfonate-based high-efficiency water reducer, powdered polycarboxylate and naphthalenesulfonate water reducer.

3. The soil solidifying agent according to claim 2, characterized in that The water content of the industrial solid waste slag particle mixture is less than 1wt%; The specific surface area of ​​the industrial solid waste slag particle mixture is 500-600m 2 / kg.

4. The soil solidifying agent according to any one of claims 1 to 3, characterized in that: In the impact-resistant mixed additive, the initiator solution is an APS aqueous solution, and the content of APS is 55-65wt.%; And / or, the emulsifier is DNS-86.

5. The method for preparing the soil solidifying agent according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: S1: mixing butyl acrylate, styrene and acrylic acid to form a mixture A; S2: adding the mixture A obtained in step S1 dropwise to a mixture containing an emulsifier and a surfactant to form a pre-emulsion B; S3: adding humic acid, deionized water and initiator solution to the pre-emulsion B obtained in step S2 to form an impact-resistant mixed additive; S4: Stir and mix all the raw materials of the impact-resistant mixed additive and the reinforcing agent obtained in step S3 to obtain the soil solidifying agent.

6. The preparation method according to claim 5, characterized in that: In step S3, humic acid and deionized water are first added to the pre-emulsion B, and the mixture is stirred and heated to 60-78° C., and the initiator solution is added dropwise while being stirred and heated to 83-87° C. After the addition is complete, the mixture is stirred and heated to 90-94° C., and the mixture is filtered after the reaction to form an impact-resistant mixed additive; Stir and heat to 60-78°C at a rate of 1-3°C per minute; The time for adding the initiator solution dropwise is 2-3 hours.

7. The preparation method according to claim 6, characterized in that: After heating to 90-94°C, continue the reaction for 25-35 minutes; then cool to 70-74°C and keep warm for 25-35 minutes, finally cool and filter.

8. The preparation method according to claim 7, characterized in that: The filtration is performed using a filter membrane with a pore size of 60-80 mesh; The cooling is to 20-30°C.

9. The preparation method according to claim 8, characterized in that: The pH of the pre-emulsion B is 8-9.

10. The preparation method according to any one of claims 5 to 9, characterized in that: The preparation method of the freeze-thaw-resistant composite mixed powder comprises: mixing ammonium chloride, water-based epoxy resin solution, waste asphalt and anionic emulsifier particle powder and reacting at 150-200° C. for 3-5 hours to obtain the obtained powder; And / or, the industrial solid waste slag particle mixture is ground to a specific surface area of ​​500-600m before adding 2 / kg.

11. Use of the soil solidifying agent prepared by the soil solidifying agent described in any one of claims 1 to 4 or the method described in any one of claims 5 to 10 in road engineering; The road described is a mining road in a high-altitude and cold area.

12. A road base material, characterized in that: The pavement base material comprises the soil curing agent described in any one of claims 1-4 or the soil curing agent prepared by the method described in any one of claims 5-10, and the addition amount of the soil curing agent is 4-6% of the weight of the pavement base material.

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