Grouting material for stabilizing bottom plate of bridge support

Abstract

The invention provides a grouting material for stabilizing a bottom plate of a bridge support, and relates to the field of engineering materials, the grouting material for stabilizing the bottom plate of the bridge support comprises the following components by weight: 75-90 parts of Portland cement; 13 to 17 parts of a mineral admixture; 120 to 135 parts of fine aggregate; 1.5 to 2.5 parts of a vegetable gum water-retaining agent; 1 to 2 parts of a thickening agent; 0.5 to 1.5 parts of an anti-freezing agent; 1.5 to 2.5 parts of a waterproof agent; 0.5 to 1.5 parts of a defoaming agent; 1-2 parts of a water reducing agent; the preparation method comprises the following steps: adding the sesbania gum, the sodium alginate and the tamarind gum into the grouting material, adsorbing moisture in the grouting material through colloid molecules in the sesbania gum and the tamarind gum, and reducing effective moisture participating in cement hydration reaction, while the sodium alginate reacts with calcium ions in the grouting material to form a gelatinous substance when being mixed with the grouting material, so that the calcium ions in the grouting material can be effectively reduced, and the calcium ions in the grouting material can be effectively reduced. The gelatinous substance can absorb part of water in the forming process, so that the part of water does not participate in cement hydration reaction in a short time, and the operable time of the grouting material is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of engineering materials, and particularly to a grouting material for stabilizing the bottom plate of a bridge bearing. Background Art

[0002] The bottom plate of a bridge bearing is an important part of the bridge bearing. It is located between the bridge and the cushion stone and is connected to the bottom of the beam or slab of the upper structure. Its main function is to bear and transfer the loads received by the upper structure of the bridge, ensuring the stability and safety of the bridge structure. There is a certain installation gap between the bottom plate of the bridge bearing and the pier or abutment. In order to strengthen the stability of the bottom plate of the bridge bearing, it is necessary to use a grouting material to fill these gaps, form a firm connection, enhance the integrity between the bearing and the lower structure, and the grouting material has a high strength after hardening, which can effectively transfer the loads of the upper structure of the bridge to the pier or abutment, ensuring the balanced stress distribution of each part of the bridge under the action of forces.

[0003] A grouting material is a special concrete material specifically used to fill, connect, and reinforce the internal voids, cracks, holes of various buildings and structures, or the foundation rock and soil mass. It has extremely high fluidity and can fill various complex spaces autonomously or with the help of pressure. After hardening, it has high strength and stability.

[0004] However, the existing grouting materials have a short operable time and require the grouting operation to be completed in a short time, greatly increasing the construction difficulty.

[0005] Therefore, it is necessary to provide a new grouting material for stabilizing the bottom plate of a bridge bearing to solve the above technical problems. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a grouting material for stabilizing the bottom plate of a bridge bearing.

[0007] The grouting material for stabilizing the bottom plate of a bridge bearing provided by the present invention is composed of the following components by weight: Portland cement: 75 - 90 parts; mineral admixture: 13 - 17 parts; fine aggregate: 120 - 135 parts; plant gum water retention agent: 1.5 - 2.5 parts; thickening agent: 1 - 2 parts; antifreeze: 0.5 - 1.5 parts; waterproof agent: 1.5 - 2.5 parts; defoaming agent: 0.5 - 1.5 parts; water reducing agent: 1 - 2 parts; expansive agent: 0.5 - 2 parts.

[0008] The plant gum water retention agent includes the following materials by weight: sesbania gum: 8 - 10 parts; sodium alginate: 5 - 7 parts; tamarind gum: 6 - 8 parts.

[0009] Preferably, the fine aggregate is a mixture composed of one or two of natural sand and manufactured sand.

[0010] Preferably, the mineral admixture is one or a mixture of two or more of fly ash, slag powder, silica fume, limestone powder, hemihydrate gypsum, and microsilica.

[0011] Preferably, the expansive agent is one or a mixture of two or more of ettringite-based expansive agents, magnesia expansive agents, and sulfoaluminate-based expansive agents.

[0012] Preferably, the thickening agent is one or a mixture of two or more of polyurea formaldehyde resin, cellulose ether, and sodium polyacrylate.

[0013] Preferably, the waterproof agent is a polyurethane waterproof agent.

[0014] Preferably, the water reducing agent is a polycarboxylate water reducing agent.

[0015] Preferably, it includes the following preparation steps:

[0016] S1: Prepare each material according to the formula, prepare a stirring device, and clean the inside of the stirring device to ensure it is clean and free of debris.

[0017] S2: Add portland cement, mineral admixture, and fine aggregate into the stirring device in sequence, and start the stirring device. Make the stirring device stir intermittently in a clockwise and counterclockwise manner for 10 - 15 minutes, with a stirring speed of 300 - 350 revolutions per minute, so that various solid materials inside the stirring device are evenly dispersed.

[0018] S3: After various solid materials inside the stirring device are evenly dispersed, gradually reduce the stirring speed to keep it at 100 - 120 revolutions per minute, and slowly and evenly add the water reducing agent, plant gum water retaining agent, expansive agent, thickening agent, antifreeze agent, waterproof agent, and defoaming agent into the stirring device in sequence. During the addition process, add a certain amount of water synchronously, and gradually increase the stirring speed to make the stirring speed reach 330 - 370 revolutions per minute. Keep stirring at this speed for 10 - 15 minutes to make the additives evenly distributed in the solid materials, forming a uniform grouting material slurry.

[0019] S4: Pour the grouting material slurry obtained in S3 into a static container and let it stand for 15 - 30 minutes to naturally discharge the internal bubbles.

[0020] S5: Pour the grouting material slurry after standing in S4 into a storage container.

[0021] Compared with the related technology, the grouting material provided by the present invention for stabilizing the bridge bearing bottom plate has the following beneficial effects:

[0022] 1. By adding sesbania gum, sodium alginate, and tamarind gum, the present invention can effectively increase the workable time of the grouting material. Through the colloidal molecules in sesbania gum and tamarind gum, the water in the grouting material is adsorbed, thereby reducing the effective water participating in the cement hydration reaction. When sodium alginate is mixed with the grouting material, it reacts with calcium ions in the grouting material to form a gel-like substance. During the formation of this gel-like substance, it absorbs some water, causing this part of the water to no longer participate in the cement hydration reaction in a short time, thus extending the workable time of the grouting material.

[0023] 2. The polymer chains in the sesbania gum and tamarind gum added in the present invention can fully stretch in water and fill into the microscopic pores inside the grouting material to form a dense filling layer, reducing the porosity, thereby reducing the penetration channels of water and other harmful substances. After sodium alginate encounters calcium ions in the grouting material, the formed gel-like substance has good sealing and toughness, which can further block and reduce pores, improving the anti-permeability of the grouting material.

[0024] 3. The sodium alginate added in the present invention has a strong water absorption capacity and can quickly absorb the surrounding water and expand. This water absorption and expansion process not only increases the volume of the grouting material but also makes the water molecules more evenly distributed in the network structure. At the same time, the high viscosity property of tamarind gum helps to maintain this wet state, enabling the water molecules to flow more easily in the network structure, improving the fluidity of the grouting material. Specific Embodiments

[0025] The present invention will be further described below in conjunction with the embodiments.

[0026] Example 1:

[0027] In the specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0028] Portland cement: 75 parts; Mineral admixture: 13 parts; Fine aggregate: 120 parts; Vegetable gum water retainer: 1.5 parts; Thickening agent: 1 part; Antifreeze: 0.5 part; Waterproof agent: 1.5 part; Defoaming agent: 0.5 part; Water reducing agent: 1 part; Expansive agent: 0.5 part;

[0029] The vegetable gum water retainer includes the following materials by weight: Sesbania gum: 8 parts; Sodium alginate: 5 parts; Tamarind gum: 6 parts;

[0030] The mineral admixture is a mixture composed of fly ash, limestone powder, hemihydrate gypsum, and microsilica;

[0031] The fine aggregate is a mixture composed of natural sand and manufactured sand;

[0032] The thickener is a mixture composed of polyurea formaldehyde resin, cellulose ether and sodium polyacrylate;

[0033] The antifreeze is sodium nitrate;

[0034] The waterproof agent is a polyurethane waterproof agent;

[0035] The defoamer is fatty acid amide;

[0036] The water reducing agent is a polycarboxylate water reducing agent;

[0037] The expansive agent is a mixture composed of ettringite expansive agent and magnesia expansive agent;

[0038] A preparation method of a grouting material for stabilizing the bottom plate of a bridge bearing. The preparation materials of the grouting material include the above-mentioned preparation materials by weight;

[0039] The specific preparation method includes the following steps:

[0040] S1: Prepare each material according to the formula, prepare a stirring device, and clean the inside of the stirring device to ensure that it is clean and free of debris;

[0041] S2: Add portland cement, mineral admixture and fine aggregate into the inside of the stirring device in sequence, and start the stirring device to make the stirring device stir intermittently in a clockwise and counterclockwise manner for 10 minutes, with a stirring speed of 300 revolutions per minute, so that various solid materials inside the stirring device are evenly dispersed;

[0042] S3: After various solid materials inside the stirring device are evenly dispersed, gradually reduce the stirring speed to keep the stirring speed at 100 revolutions per minute, and slowly and evenly add the water reducing agent, plant gum water retaining agent, expansive agent, thickener, antifreeze, waterproof agent and defoamer into the inside of the stirring device in sequence. During the adding process, add a certain amount of water synchronously, and gradually increase the stirring speed to make the stirring speed reach 330 revolutions per minute, and keep stirring at this speed for 10 minutes to make the additives evenly distributed in the solid materials to form a uniform grouting material slurry;

[0043] S4: Pour the grouting material slurry obtained in S3 into a static container and let it stand for 20 minutes to allow the internal bubbles to naturally escape;

[0044] S5: Pour the grouting material slurry after standing in S4 into a storage container.

[0045] The preparation process of the plant gum water retaining agent is as follows:

[0046] (1) Prepare guar gum, sodium alginate and tamarind gum according to the formula, and prepare a clean mixing device, a stirring rod and three clean storage containers;

[0047] (2) Put the sesbania gum, sodium alginate, and tamarind gum into three separate containers respectively;

[0048] (3) Slowly add an appropriate amount of hot water to the container with sesbania gum. The temperature of the hot water is 55°C. During the addition of hot water, use a stirrer to stir to evenly dissolve the sesbania gum. Wipe the stirrer clean and set it aside for later use;

[0049] (4) Add an appropriate amount of cold water to the container with sodium alginate. During the addition of cold water, use a stirrer to stir to evenly dissolve the sodium alginate. Wipe the stirrer clean and set it aside for later use;

[0050] (5) Add an appropriate amount of hot water to the container with tamarind gum. The temperature of the hot water is 50°C. During the addition of hot water, use a stirrer to stir to evenly dissolve the tamarind gum;

[0051] (6) Start the mixing equipment and keep the stirring speed inside the mixing equipment at 100 revolutions per minute. Slowly pour the dissolved sesbania gum, sodium alginate, and tamarind gum into the mixing equipment, and add an appropriate amount of water to the mixing equipment. After adding water, gradually increase the stirring speed to keep the stirring speed at 310 revolutions per minute and stir for 13 minutes to fully mix the sesbania gum, sodium alginate, and tamarind gum;

[0052] (7) After the sesbania gum, sodium alginate, and tamarind gum are fully mixed, gradually reduce the stirring speed until the stirring stops to obtain the plant gum water retention agent.

[0053] Example 2:

[0054] Follow the same preparation method as in Example 1. The difference from Example 1 is that in the specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0055] Portland cement: 85 parts; Mineral admixture: 15 parts; Fine aggregate: 125 parts; Plant gum water retention agent: 2 parts; Thickening agent: 1.5 parts; Antifreeze: 1 part; Waterproof agent: 2 parts; Defoaming agent: 1 part; Water reducing agent: 1.5 parts; Expansive agent: 1.5 parts;

[0056] The plant gum water retention agent includes the following materials by weight: Sesbania gum: 9 parts; Sodium alginate: 6 parts; Tamarind gum: 7 parts;

[0057] The mineral admixture is a mixture composed of fly ash, limestone powder, hemihydrate gypsum, and microsilica;

[0058] The fine aggregate is a mixture composed of natural sand and manufactured sand;

[0059] The thickening agent is a mixture composed of polyurea formaldehyde resin, cellulose ether, and sodium polyacrylate;

[0060] The antifreeze agent is sodium nitrate;

[0061] The waterproof agent is a polyurethane waterproof agent;

[0062] The defoaming agent is fatty acid amide;

[0063] The water reducing agent is a polycarboxylate water reducing agent;

[0064] The expansive agent is a mixture composed of ettringite-based expansive agent and magnesia expansive agent.

[0065] Example 3:

[0066] In the specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0067] Portland cement: 90 parts; Mineral admixture: 17 parts; Fine aggregate: 135 parts; Vegetable gum water retention agent: 2.5 parts; Thickening agent: 2 parts; Antifreeze agent: 1.5 parts; Waterproof agent: 2.5 parts; Defoaming agent: 1.5 parts; Water reducing agent: 2 parts; Expansive agent: 2 parts;

[0068] The vegetable gum water retention agent includes the following materials by weight: Sesbania gum: 10 parts; Sodium alginate: 7 parts; Tamarind gum: 8 parts;

[0069] The mineral admixture is a mixture composed of fly ash, limestone powder, hemihydrate gypsum and microsilica;

[0070] The fine aggregate is a mixture composed of natural sand and manufactured sand;

[0071] The thickening agent is a mixture composed of polyurea formaldehyde resin, cellulose ether and sodium polyacrylate;

[0072] The antifreeze agent is sodium nitrate;

[0073] The waterproof agent is a polyurethane waterproof agent;

[0074] The defoaming agent is fatty acid amide;

[0075] The water reducing agent is a polycarboxylate water reducing agent;

[0076] The expansive agent is a mixture composed of ettringite-based expansive agent and magnesia expansive agent;

[0077] A preparation method of a grouting material for stabilizing the bottom plate of a bridge bearing, the preparation materials of the grouting material include the above-mentioned preparation materials by weight;

[0078] The specific preparation method includes the following steps:

[0079] S1: Prepare each material according to the formula, prepare a stirring device, and clean the inside of the stirring device to ensure that it is clean and free of debris;

[0080] S2: Add portland cement, mineral admixture, and fine aggregate into the interior of the mixing equipment in sequence, and start the mixing equipment to mix for 15 minutes in a way of intermittent mixing clockwise and counterclockwise at a mixing speed of 350 revolutions per minute, so that various solid materials inside the mixing equipment are evenly dispersed;

[0081] S3: After various solid materials inside the mixing equipment are evenly dispersed, gradually reduce the mixing speed to keep it at 120 revolutions per minute, and slowly and evenly add water reducer, plant gum water retainer, expansive agent, thickening agent, antifreeze agent, waterproof agent, and defoaming agent into the interior of the mixing equipment in sequence. During the adding process, add a certain amount of water synchronously, and gradually increase the mixing speed to make the mixing speed reach 370 revolutions per minute, and keep mixing at this speed for 15 minutes to make the additives evenly distributed in the solid materials, forming a uniform grouting material slurry;

[0082] S4: Pour the grouting material slurry obtained in S3 into a static container and let it stand for 30 minutes to naturally discharge the air bubbles inside;

[0083] S5: Pour the grouting material slurry after standing in S4 into a storage container.

[0084] The preparation process of the plant gum water retainer is as follows:

[0085] (1) Prepare guar gum, sodium alginate, and tamarind gum according to the parts of the formula, and prepare a clean mixing equipment, a stirring rod, and three clean containers for holding;

[0086] (2) Put guar gum, sodium alginate, and tamarind gum into the three containers for holding respectively;

[0087] (3) Slowly add an appropriate amount of hot water with a temperature of 55° into the container holding guar gum, and use a stirring rod to stir during the adding process of hot water to make the guar gum dissolve evenly, and wipe the stirring rod clean for standby;

[0088] (4) Add an appropriate amount of cold water into the container holding sodium alginate, and use a stirring rod to stir during the adding process of cold water to make the sodium alginate dissolve evenly, and wipe the stirring rod clean for standby;

[0089] (5) Add an appropriate amount of hot water with a temperature of 50° into the container holding tamarind gum, and use a stirring rod to stir during the adding process of hot water to make the tamarind gum dissolve evenly;

[0090] (6) Start the mixing device, keep the stirring speed inside the mixing device at 100 revolutions per minute, slowly pour the dissolved sesbania gum, sodium alginate, and tamarind gum into the mixing device, and add an appropriate amount of water to the mixing device. After adding water, gradually increase the stirring speed to keep the stirring speed at 310 revolutions per minute, and stir for 13 minutes to fully mix the sesbania gum, sodium alginate, and tamarind gum;

[0091] (7) After the sesbania gum, sodium alginate, and tamarind gum are fully mixed, gradually reduce the stirring speed until the stirring stops to obtain the plant gum water retaining agent.

[0092] Comparative Example 1:

[0093] In the specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0094] Portland cement: 75 parts; Mineral admixture: 13 parts; Fine aggregate: 120 parts; Plant gum water retaining agent: 1.5 parts; Thickening agent: 1 part; Antifreeze: 0.5 part; Waterproof agent: 1.5 parts; Defoaming agent: 0.5 part; Water reducing agent: 1 part; Expansive agent: 0.5 part;

[0095] The plant gum water retaining agent includes the following materials by weight: Sodium alginate: 5 parts; Tamarind gum: 6 parts;

[0096] The mineral admixture is a mixture composed of fly ash, limestone powder, hemihydrate gypsum, and microsilica powder;

[0097] The fine aggregate is a mixture composed of natural sand and manufactured sand;

[0098] The thickening agent is a mixture composed of polyurea formaldehyde resin, cellulose ether, and sodium polyacrylate;

[0099] The antifreeze is sodium nitrate;

[0100] The waterproof agent is a polyurethane waterproof agent;

[0101] The defoaming agent is fatty acid amide;

[0102] The water reducing agent is a polycarboxylate water reducing agent;

[0103] The expansive agent is a mixture composed of ettringite-based expansive agent and magnesium oxide expansive agent;

[0104] A preparation method of a grouting material for stabilizing the bottom plate of a bridge bearing, the preparation materials of the grouting material include the above-mentioned preparation materials by weight;

[0105] The specific preparation method includes the following steps:

[0106] S1: Prepare each material according to the recipe amounts, prepare the mixing equipment, and clean the inside of the mixing equipment to ensure it is clean and free of debris;

[0107] S2: Add portland cement, mineral admixture, and fine aggregate into the mixing equipment in sequence, and start the mixing equipment. Let the mixing equipment mix intermittently in a clockwise and counterclockwise manner for 10 minutes at a mixing speed of 300 revolutions per minute to evenly disperse various solid materials inside the mixing equipment;

[0108] S3: After the various solid materials inside the mixing equipment are evenly dispersed, gradually reduce the mixing speed to keep it at 100 revolutions per minute. Slowly and evenly add water reducer, plant gum water retainer, expansive agent, thickening agent, antifreeze agent, waterproof agent, and defoaming agent into the mixing equipment in sequence. During the addition process, add a certain amount of water synchronously, and gradually increase the mixing speed to make it reach 330 revolutions per minute. Keep this speed and mix for 10 minutes to evenly distribute the additives in the solid materials and form a uniform grouting material slurry;

[0109] S4: Pour the grouting material slurry obtained in S3 into a static container and let it stand for 20 minutes to naturally discharge the air bubbles inside;

[0110] S5: Pour the grouting material slurry after standing in S4 into a storage container.

[0111] The preparation process of the plant gum water retainer is as follows:

[0112] (1) Prepare sodium alginate and tamarind gum according to the recipe amounts, and prepare a clean mixing equipment, stirring rod, and two clean containers for holding;

[0113] (2) Put sodium alginate and tamarind gum into the two containers for holding respectively;

[0114] (3) Add an appropriate amount of cold water into the container holding sodium alginate, and use the stirring rod to stir during the addition of cold water to evenly dissolve sodium alginate. Wipe the stirring rod clean and set it aside;

[0115] (4) Add an appropriate amount of hot water with a temperature of 50° into the container holding tamarind gum, and use the stirring rod to stir during the addition of hot water to evenly dissolve tamarind gum;

[0116] (5) Start the mixing equipment, keep the mixing speed inside the mixing equipment at 100 revolutions per minute, slowly pour the dissolved sodium alginate and tamarind gum into the mixing equipment, and add an appropriate amount of water into the mixing equipment. After adding water, gradually increase the mixing speed to keep it at 310 revolutions per minute and mix for 13 minutes to fully mix sodium alginate and tamarind gum;

[0117] (6) After the sodium alginate and tamarind gum are fully mixed, the stirring speed is gradually reduced until the stirring is stopped to obtain a plant gum water retaining agent.

[0118] Comparative Example 2:

[0119] In a specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0120] Portland cement: 85 parts; mineral admixture: 15 parts; fine aggregate: 125 parts; plant glue water retaining agent: 2 parts; thickener: 1.5 parts; antifreeze agent: 1 part; waterproofing agent: 2 parts; defoamer: 1 part; water reducing agent: 1.5 parts; expansion agent: 1.5 parts;

[0121] The plant gum water retaining agent comprises the following materials in parts by weight: 9 parts of sesbania gum; 7 parts of tamarind gum;

[0122] The mineral admixture is a mixture of fly ash, limestone powder, semi-hydrated gypsum and microsilica powder;

[0123] The fine aggregate is a mixture of natural sand and machine-made sand;

[0124] The thickener is a mixture of polyurea-formaldehyde resin, cellulose ether and sodium polyacrylate;

[0125] The antifreeze is sodium nitrate;

[0126] The waterproofing agent is a polyurethane waterproofing agent;

[0127] The defoamer is fatty acid amide;

[0128] The water reducing agent is a polycarboxylate water reducing agent;

[0129] The expansion agent is a mixture of an ettringite expansion agent and a magnesium oxide expansion agent;

[0130] A method for preparing a grouting material for stabilizing a bridge bearing bottom plate, wherein the preparation materials of the grouting material include the above-mentioned preparation materials in parts by weight;

[0131] The specific preparation method comprises the following steps:

[0132] S1: Prepare the ingredients according to the recipe, prepare the mixing equipment, and clean the inside of the mixing equipment to ensure that it is clean and free of debris;

[0133] S2: Add silicate cement, mineral admixture and fine aggregate into the mixing device in sequence, and start the mixing device to mix the mixture intermittently in a clockwise and counterclockwise direction for 10 minutes at a mixing speed of 300 rpm, so that the various solid materials in the mixing device are evenly dispersed;

[0134] S3: After the various solid materials inside the stirring device are evenly dispersed, the stirring speed is gradually reduced to keep the stirring speed at 100 rpm, and the water reducing agent, plant gum water retaining agent, expander, thickener, antifreeze agent, waterproofing agent and defoaming agent are slowly and evenly added into the stirring device in sequence, and a certain amount of water is added simultaneously during the adding process, and the stirring speed is gradually increased to reach 330 rpm, and the stirring speed is maintained for 10 minutes to evenly distribute the additives in the solid materials to form a uniform grouting slurry;

[0135] S4: pour the grouting slurry obtained in S3 into a standing container and let it stand for 20 minutes to allow the bubbles inside to be discharged naturally;

[0136] S5: Pour the grouting slurry after being allowed to stand in S4 into a storage container.

[0137] The preparation process of the plant glue water retaining agent is as follows:

[0138] (1) Prepare sesbania gum and tamarind gum according to the number of parts of the recipe, and prepare a clean mixing device, a stirring rod, and two clean containers;

[0139] (2) putting sesbania gum and tamarind gum into two containers respectively;

[0140] (3) slowly adding an appropriate amount of hot water to the container containing the sesbania gum, the temperature of the hot water being 55°, and stirring with a stirring rod during the addition of the hot water to uniformly dissolve the sesbania gum, and wiping the stirring rod clean for later use;

[0141] (4) adding an appropriate amount of hot water to the container containing tamarind gum, the temperature of the hot water being 50°, and stirring with a stirring rod during the addition of the hot water to uniformly dissolve the tamarind gum;

[0142] (5) starting a mixing device to maintain a stirring speed of 100 rpm, slowly pouring the dissolved sesbania gum and tamarind gum into the mixing device, and adding an appropriate amount of water into the mixing device. After adding the water, gradually increasing the stirring speed to maintain the stirring speed at 310 rpm, stirring for 13 minutes to fully mix the sesbania gum and tamarind gum;

[0143] (6) After the sesbania gum and the tamarind gum are fully mixed, the stirring speed is gradually reduced until the stirring is stopped to obtain a plant gum water retaining agent.

[0144] Comparative Example 3:

[0145] In a specific implementation process, a grouting material for stabilizing the bottom plate of a bridge bearing includes the following materials by weight:

[0146] Portland cement: 85 parts; Mineral admixture: 15 parts; Fine aggregate: 125 parts; Thickening agent: 1.5 parts; Antifreeze agent: 1 part; Waterproof agent: 2 parts; Defoaming agent: 1 part; Water reducing agent: 1.5 parts; Expansive agent: 1.5 parts;

[0147] The mineral admixture is a mixture composed of fly ash, limestone powder, hemihydrate gypsum and microsilica;

[0148] The fine aggregate is a mixture composed of natural sand and manufactured sand;

[0149] The thickening agent is a mixture composed of polyurea formaldehyde resin, cellulose ether and sodium polyacrylate;

[0150] The antifreeze agent is sodium nitrate;

[0151] The waterproof agent is polyurethane waterproof agent;

[0152] The defoaming agent is fatty acid amide;

[0153] The water reducing agent is polycarboxylate water reducing agent;

[0154] The expansive agent is a mixture composed of ettringite type expansive agent and magnesium oxide expansive agent;

[0155] A preparation method of a grouting material for stabilizing the bottom plate of a bridge bearing. The preparation materials of the grouting material include the above-mentioned preparation materials by weight;

[0156] The specific preparation method includes the following steps:

[0157] S1: Prepare each material according to the recipe, prepare a stirring device, and clean the inside of the stirring device to ensure that it is clean and free of debris;

[0158] S2: Add Portland cement, mineral admixture and fine aggregate into the stirring device in sequence, and start the stirring device to make the stirring device stir intermittently clockwise and counterclockwise for 10 minutes at a stirring speed of 300 revolutions per minute, so that various solid materials inside the stirring device are evenly dispersed;

[0159] S3: After various solid materials inside the stirring device are evenly dispersed, gradually reduce the stirring speed to keep the stirring speed at 100 revolutions per minute, and slowly and evenly add the water reducing agent, expansive agent, thickening agent, antifreeze agent, waterproof agent and defoaming agent into the stirring device in sequence. During the adding process, add a certain amount of water synchronously, and gradually increase the stirring speed to make the stirring speed reach 330 revolutions per minute, and keep stirring at this speed for 10 minutes to make the additives evenly distributed in the solid materials to form a uniform grouting material slurry;

[0160] S4: Pour the grouting material slurry obtained in S3 into a static container and let it stand for 20 minutes to allow the internal bubbles to naturally escape;

[0161] S5: Pour the grouting material slurry after standing in S4 into the storage container.

[0162] Experiment 1:

[0163] Now, test the grouting materials prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 for the stability of the bridge bearing bottom plate, and measure their fluidity, flexural strength, compressive strength, bleeding rate, and operable time. The specific test results are as follows:

[0164]

[0165]

[0166] Table 1

[0167] As can be seen from the above table, after adding sesbania gum, sodium alginate, and tamarind gum, the operable time of the grouting material can be effectively improved. Because sesbania gum and tamarind gum can compete with cement particles for water in the grouting material, and a part of the water is adsorbed by the colloidal molecules of sesbania gum and tamarind gum, reducing the effective water participating in the cement hydration reaction, thus slowing down the process of cement hydration reaction. When sodium alginate is mixed with the grouting material, it will react with calcium ions in the grouting material to form a gel-like substance. This gel-like substance will absorb some water during the formation process, making this part of the water no longer participate in the cement hydration reaction in a short time, thus extending the operable time of the grouting material;

[0168] The high molecular chains of sesbania gum and tamarind gum can fully stretch and fill into the microscopic pores inside the grouting material in water, forming a dense filling layer, reducing the porosity, thus reducing the penetration channels of water and other harmful substances. And after sodium alginate encounters calcium ions in the grouting material, the formed gel-like substance has good sealing and toughness, which can further block and reduce pores, improving the anti-permeability of the grouting material;

[0169] Sesbania gum, tamarind gum, and sodium alginate all contain a large number of hydrophilic groups in their molecules. When they are mixed with water, these hydrophilic groups will form hydrogen bonds with water molecules, causing the colloidal molecules to diffuse and connect with each other in water to form a three-dimensional network structure. This network structure helps to increase the consistency and viscosity of the grouting material, while allowing water molecules to flow freely in it, thus maintaining good fluidity. And the added sodium alginate has a strong water absorption capacity and can quickly absorb the surrounding water and expand. This water absorption and expansion process not only increases the volume of the grouting material, but also makes the water molecules more evenly distributed in the network structure. At the same time, the high viscosity property of tamarind gum helps to maintain this wet state, making the water molecules flow more easily in the network structure.

[0170] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms.

[0171] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A grouting material for stabilizing the bottom plate of a bridge bearing, characterized in that, It consists of the following components by weight parts: Portland cement: 75 - 90 parts; mineral admixture: 13 - 17 parts; fine aggregate: 120 - 135 parts; plant gum water retention agent: 1.5 - 2.5 parts; thickening agent: 1 - 2 parts; antifreeze: 0.5 - 1.5 parts; waterproof agent: 1.5 - 2.5 parts; defoaming agent: 0.5 - 1.5 parts; water reducing agent: 1 - 2 parts; expansive agent: 0.5 - 2 parts; The plant gum water retention agent includes the following materials by weight parts: sesbania gum: 8 - 10 parts; sodium alginate: 5 - 7 parts; tamarind gum: 6 - 8 parts.

2. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The fine aggregate is a mixture composed of one or both of natural sand and manufactured sand.

3. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The mineral admixture is a mixture of one or more of fly ash, slag powder, silica fume, limestone powder, hemihydrate gypsum, microsilica.

4. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The expansive agent is a mixture of one or more of ettringite - type expansive agent, magnesia expansive agent and sulfoaluminate - type expansive agent.

5. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The thickening agent is a mixture of one or more of polyurea - formaldehyde resin, cellulose ether and sodium polyacrylate.

6. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The waterproof agent is polyurethane waterproof agent.

7. The grouting material for stabilizing the bottom plate of a bridge bearing according to claim 1, characterized in that, The water reducing agent is polycarboxylate water reducing agent.

8. The grouting material for stabilizing the bottom plate of a bridge bearing according to any one of claims 1-7, characterized in that, It includes the following preparation steps: S1: Prepare each material according to the formula, prepare the mixing equipment, and clean the inside of the mixing equipment to ensure it is clean and free of debris; S2: Add Portland cement, mineral admixture and fine aggregate into the mixing equipment in sequence, and start the mixing equipment. Let the mixing equipment stir in a clockwise and counter - clockwise intermittent stirring manner for 10 - 15 minutes, with a stirring speed of 300 - 350 revolutions per minute, so that various solid materials inside the mixing equipment are evenly dispersed; S3: After various solid materials inside the mixing equipment are evenly dispersed, gradually reduce the stirring speed to keep it at 100 - 120 revolutions per minute, and slowly and evenly add the water reducing agent, plant gum water retention agent, expansive agent, thickening agent, antifreeze, waterproof agent and defoaming agent into the mixing equipment in sequence. During the adding process, add a certain amount of water synchronously, and gradually increase the stirring speed to make the stirring speed reach 330 - 370 revolutions per minute, and keep stirring at this speed for 10 - 15 minutes to make the additives evenly distributed in the solid materials, forming a uniform grouting slurry; S4: Pour the grouting slurry obtained in S3 into a static container and let it stand for 15 - 30 minutes to allow the internal bubbles to naturally escape; S5: Pour the grouting slurry after standing in S4 into a storage container.

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