Micro-expansion grouting material for reinforcing bridge, tunnel and roadbed and processing technology

Abstract

The invention is suitable for the technical field of bridge and tunnel lining grouting and roadbed reinforcement, and provides a micro-expansion grouting material for bridge, tunnel and roadbed reinforcement and a processing technology. The micro-expansion grouting material is prepared from the following components in parts by mass: 50 to 100 parts of P.O42.5 cement, 400 to 450 parts of sulphoaluminate cement, 380 to 500 parts of quartz sand composition, 30 to 50 parts of emery, 50 to 100 parts of fly ash, 30 to 60 parts of silica fume, 0.1 to 0.3 part of expanding agent and 1 to 3 parts of chemical additive, preferably, the quartz sand composition comprises the following components in parts by mass: 30 to 50 parts of quartz sand of 20 to 40 meshes, 300 to 350 parts of quartz sand of 40 to 80 meshes and 50 to 100 parts of quartz sand of 80 to 120 meshes. The prepared product has the advantages of high fluidity, high bonding strength, good bonding property, slight expansion, impermeability, durability and low later-stage reinforcement frequency, the reinforcement effect is greatly improved, and the later-stage reinforcement cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge, tunnel lining grouting and roadbed reinforcement, and in particular to a micro-expansion grouting material for bridge, tunnel and roadbed reinforcement and a processing technology. Background Art

[0002] Roadbed reinforcement is a technical means to improve and stabilize the bearing capacity and stability of roadbeds in the construction of infrastructure such as roads, railways, and bridges. Its purpose is to improve or enhance the physical and mechanical properties of the roadbed soil layer to ensure that the road does not suffer from uneven settlement, cracking or other deformation problems during use, thereby ensuring traffic safety and long-term performance of the road.

[0003] Grouting reinforcement is one of the most common bridge and tunnel lining grouting and roadbed reinforcement technologies. Grouting materials (such as cement slurry, polymer slurry, etc.) are injected into the roadbed to fill cracks and pores, thereby improving the density and strength of the soil.

[0004] Micro-expansion grouting material is a type of grouting material. It is a slurry with micro-expansion properties (usually cement-based or chemical-based slurry) that is injected into the soil layer or structure through a grouting pipe. The slurry will expand micro-expand inside the soil or in the cracks, filling the voids and cracks, increasing the density of the soil, and at the same time improving the strength and stability of the soil through the expansion effect.

[0005] Most of the existing micro-expansion grouting materials have low fluidity, low bonding strength, poor impermeability and poor durability, and thus require regular reinforcement with high frequency and high cost. Summary of the invention

[0006] The purpose of the present invention is to provide a micro-expansion grouting material and a processing technology for reinforcing bridges, tunnels and roadbeds to solve the problems in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a micro-expansion grouting material for strengthening bridges, tunnels and roadbeds, wherein the components and mass fractions of the micro-expansion grouting material are as follows:

[0008] 50-100 parts of P.O42.5 cement, 400-450 parts of sulphoaluminate cement, 380-500 parts of quartz sand composition, 30-50 parts of corundum, 50-100 parts of fly ash, 30-60 parts of silica fume, 0.1-0.3 parts of expansion agent and 1-3 parts of chemical admixture.

[0009] Preferably, the quartz sand composition is quartz sand of different gradations, and the gradations of the quartz sand composition include 80-120 mesh, 40-80 mesh, and 20-40 mesh.

[0010] Preferably, the mass proportions of quartz sands of different grades in the quartz sand composition are 30-50 parts of 20-40 mesh quartz sand, 300-350 parts of 40-80 mesh quartz sand, and 50-100 parts of 80-120 mesh quartz sand.

[0011] Preferably, the gradation of the diamond sand is 80-120 meshes.

[0012] Preferably, the chemical admixtures include water reducing agent powder, sodium gluconate, lithium sulfate, cellulose, polyvinyl alcohol, defoaming agent powder, and tartaric acid.

[0013] Preferably, the mass ratio of each component in the chemical admixture is as follows:

[0014] Water reducing agent powder: sodium gluconate: lithium sulfate: cellulose: polyvinyl alcohol: defoaming agent powder: tartaric acid = (1-2): (1-3): (2-3): (0.6-1.2): (0.5-1): (1.5-2.5): (1-3): (0.9-1.6).

[0015] Preferably, the specification of the sulphoaluminate cement is R.SAC42.5.

[0016] The second aspect of the present invention provides a processing technology of the micro-expansion grouting material according to the first aspect of the present invention, comprising the following steps:

[0017] P.O42.5 cement and sulphoaluminate cement are automatically metered into the mixing silo from the cement silo according to the proportion, stirred for 3 to 5 minutes, and then the quartz sand composition and corundum are automatically metered in turn and stirred evenly, and finally fly ash, silica fume, expansion agent and chemical admixture are added, stirred evenly, and the materials are discharged for packaging.

[0018] The present invention has at least the following beneficial effects:

[0019] The present invention provides a micro-expansion grouting material and processing technology for reinforcing bridges, tunnels and roadbeds. The prepared product has high fluidity, high bonding strength, good bonding, micro-expansion, impermeability and durability, and the frequency of later reinforcement is low, which greatly improves the reinforcement effect and reduces the cost of later reinforcement. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] This embodiment provides a micro-expansion grouting material for strengthening bridges, tunnels, and roadbeds, and its components and mass fractions are as follows:

[0023] 50 parts of P.O42.5 cement, 400 parts of sulphoaluminate cement, 380 parts of quartz sand composition, 30 parts of corundum, 50 parts of fly ash, 30 parts of silica fume, 0.1 parts of expansion agent and 1 part of chemical admixture.

[0024] The quartz sand composition is quartz sand of different gradations, and the gradations of the quartz sand composition include 80-120 mesh, 40-80 mesh, and 20-40 mesh, and the mass fractions thereof are as follows:

[0025] The mass proportions are 30 parts of 20-40 mesh quartz sand, 300 parts of 40-80 mesh quartz sand, and 50 parts of 80-120 mesh quartz sand.

[0026] Among them, the grading of diamond sand is 80-120 mesh; the specification of sulphoaluminate cement is R.SAC42.5.

[0027] Among them, chemical admixtures include water reducing agent powder, sodium gluconate, lithium sulfate, cellulose, polyvinyl alcohol, defoaming agent powder, and tartaric acid; the mass ratio of each component is as follows:

[0028] Water reducing agent powder: sodium gluconate: lithium sulfate: cellulose: polyvinyl alcohol: defoaming agent powder: tartaric acid = 1:1:2:0.6:0.5:1.5:1:0.9.

[0029] Among them, the expansion agent is a sulphoaluminate expansion agent; the water reducing agent powder is a lignin sulfonate water reducing agent; and the defoaming agent powder is a silicon-based defoaming agent.

[0030] Example 2

[0031] This embodiment provides a micro-expansion grouting material for strengthening bridges, tunnels, and roadbeds, and its components and mass fractions are as follows:

[0032] 60 parts of P.O42.5 cement, 410 parts of sulphoaluminate cement, 440 parts of quartz sand composition, 40 parts of corundum, 70 parts of fly ash, 50 parts of silica fume, 0.2 parts of expansion agent and 2 parts of chemical admixture.

[0033] The quartz sand composition is quartz sand of different gradations, and the gradations of the quartz sand composition include 80-120 mesh, 40-80 mesh, and 20-40 mesh, and the mass fractions thereof are as follows:

[0034] The mass proportions are 40 parts of 20-40 mesh quartz sand, 320 parts of 40-80 mesh quartz sand, and 80 parts of 80-120 mesh quartz sand.

[0035] Among them, the grading of diamond sand is 80-120 mesh; the specification of sulphoaluminate cement is R.SAC42.5.

[0036] Among them, chemical admixtures include water reducing agent powder, sodium gluconate, lithium sulfate, cellulose, polyvinyl alcohol, defoaming agent powder, and tartaric acid; the mass ratio of each component is as follows:

[0037] Water reducing agent powder: sodium gluconate: lithium sulfate: cellulose: polyvinyl alcohol: defoaming agent powder: tartaric acid = 1.5:2:2.5:1:0.8:2:2:1.

[0038] Among them, the expansion agent is an aminosulfonate expansion agent; the water reducing agent powder is a polycarboxylate water reducing agent; and the defoaming agent powder is a polyether defoaming agent.

[0039] Example 3

[0040] This embodiment provides a micro-expansion grouting material for strengthening bridges, tunnels, and roadbeds, and its components and mass fractions are as follows:

[0041] 100 parts of P.O42.5 cement, 450 parts of sulphoaluminate cement, 500 parts of quartz sand composition, 50 parts of corundum, 100 parts of fly ash, 60 parts of silica fume, 0.3 parts of expansion agent and 3 parts of chemical admixture.

[0042] The quartz sand composition is quartz sand of different gradations, and the gradations of the quartz sand composition include 80-120 mesh, 40-80 mesh, and 20-40 mesh, and the mass fractions thereof are as follows:

[0043] The mass proportions are 50 parts of 20-40 mesh quartz sand, 350 parts of 40-80 mesh quartz sand, and 100 parts of 80-120 mesh quartz sand.

[0044] Among them, the grading of diamond sand is 80-120 mesh; the specification of sulphoaluminate cement is R.SAC42.5.

[0045] Among them, chemical admixtures include water reducing agent powder, sodium gluconate, lithium sulfate, cellulose, polyvinyl alcohol, defoaming agent powder, and tartaric acid; the mass ratios of each component are as follows:

[0046] Water reducing agent powder: sodium gluconate: lithium sulfate: cellulose: polyvinyl alcohol: defoaming agent powder: tartaric acid = 2:3:3:1.2:1:2.5:3:1.6.

[0047] Among them, the expansion agent is expanded gypsum; the water reducing agent powder is lignin sulfonate water reducing agent; and the defoaming agent powder is polyether defoaming agent.

[0048] The processing technology of the micro-expansion grouting material provided in the above embodiments 1-3 comprises the following steps:

[0049] P.O42.5 cement and sulphoaluminate cement are automatically metered into the mixing silo from the cement silo according to the proportion, stirred for 3 to 5 minutes, and then the quartz sand composition and corundum are automatically metered in turn and stirred evenly, and finally fly ash, silica fume, expansion agent and chemical admixture are added, stirred evenly, and the materials are discharged for packaging.

[0050] A series of relevant performance tests were carried out on the products prepared in the above Examples 1-3, and the results are shown in the following table:

[0051]

[0052] The product prepared by the present invention has high fluidity, high bonding strength, good bonding, micro-expansion, impermeability and durability, and low frequency of later reinforcement. It can be widely used in tunnel vault mold grouting, tunnel vault hollow grouting backfilling, gap grouting after subway segment installation, foundation and base reinforcement grouting, and various crack and hole grouting.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro-expansion grouting material for strengthening bridges, tunnels and roadbeds, characterized in that: The components and mass fractions of the micro-expansion grouting material are as follows: 50-100 parts of P.O42.5 cement, 400-450 parts of sulphoaluminate cement, 380-500 parts of quartz sand composition, 30-50 parts of corundum, 50-100 parts of fly ash, 30-60 parts of silica fume, 0.1-0.3 parts of expansion agent and 1-3 parts of chemical admixture.

2. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 1, characterized in that: The quartz sand composition is quartz sand of different gradations, and the gradations of the quartz sand composition include 80-120 meshes, 40-80 meshes, and 20-40 meshes.

3. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 2 is characterized in that: The mass proportions of the quartz sands of different grades in the quartz sand composition are 30-50 parts of 20-40 mesh quartz sand, 300-350 parts of 40-80 mesh quartz sand, and 50-100 parts of 80-120 mesh quartz sand.

4. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 1, characterized in that: The gradation of the diamond sand is 80-120 meshes.

5. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 1, characterized in that: The chemical admixtures include water reducing agent powder, sodium gluconate, lithium sulfate, cellulose, polyvinyl alcohol, defoaming agent powder and tartaric acid.

6. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 5, characterized in that: The mass ratio of each component in the chemical admixture is as follows: Water reducing agent powder: sodium gluconate: lithium sulfate: cellulose: polyvinyl alcohol: defoaming agent powder: tartaric acid = (1-2): (1-3): (2-3): (0.6-1.2): (0.5-1): (1.5-2.5): (1-3): (0.9-1.6).

7. The micro-expansion grouting material for strengthening bridges, tunnels and roadbeds according to claim 1, characterized in that: The specification of the sulphoaluminate cement is R.SAC42.

5.

8. A processing technology for the micro-expansion grouting material according to any one of claims 1 to 7, characterized in that: The following steps are involved: P.O42.5 cement and sulphoaluminate cement are automatically metered into the mixing silo from the cement silo according to the proportion, stirred for 3 to 5 minutes, and then the quartz sand composition and corundum are automatically metered in turn and stirred evenly, and finally fly ash, silica fume, expansion agent and chemical admixture are added, stirred evenly, and the materials are discharged for packaging.

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