High-performance grouting material based on machine-made sand and preparation method thereof

Abstract

The invention provides a high-performance grouting material based on machine-made sand and a preparation method thereof, and relates to the field of building materials, the high-performance grouting material based on machine-made sand and the preparation method thereof comprise the following components by weight: 30-45 parts of water; 60 to 85 parts of Portland cement; 10 to 20 parts of a mineral admixture; 15 to 20 parts of aggregate; 2-5 parts of a composite thickening agent; 0.5 to 1 part of an expanding agent; 1-2 parts of an early strength agent; 1 to 1.5 parts of a water reducing agent; 0.5 to 1 part of a defoaming agent; 0.1 to 0.3 part of a water retaining agent; 1-1.5 parts of a waterproof agent; 1 to 2 parts of a retarder; the preparation method comprises the following steps: adding xanthan gum, alginate and a vinyl acetate emulsion into 0.5-1 part of an anti-freezing agent, and connecting different molecular chains together through crosslinking points by virtue of crosslinking among xanthan gum, the vinyl acetate emulsion and alginate molecules, so as to form a more stable three-dimensional network structure, so that friction and resistance among particles in the material are increased, and the wear resistance of the material is improved; therefore, compressive strength of the grouting material is improved.

Description

Technical Field

[0001] The present invention relates to the field of building materials, and in particular to a high-performance grouting material based on manufactured sand and a preparation method thereof. Background Art

[0002] A grouting material is a special engineering material mainly used for filling, repairing or strengthening cavities or cracks in buildings. It has certain fluidity and plasticity and can be applied through construction methods such as injection, spraying or pouring. During the construction process, the grouting material can penetrate into fine cracks and holes and coagulate and harden under certain conditions, thereby achieving effects such as strengthening and leakage prevention.

[0003] In grouting materials, materials such as river sand or natural sand need to be added to increase the volume stability of the grouting material, reduce the possibility of shrinkage and cracking. At the same time, it can also improve the density and impermeability of the grouting material and increase the durability of the material. However, with the increasing depletion of natural river sand resources and the improvement of environmental protection requirements, more and more projects are now using manufactured sand to replace natural river sand.

[0004] At present, with the continuous improvement of the social and economic level, people's requirements for building structures are also getting higher and higher. Many existing buildings can no longer meet the requirements of modern life in terms of both appearance and usage functions, and urgent reinforcement and renovation are needed. Compared with traditional fine aggregate concrete, grouting materials have better fluidity, higher strength and easier construction control; compared with traditional epoxy mortar, they have good expansibility and simple and fast construction, etc. Therefore, they are widely used in secondary grouting of equipment foundations, grouting of steel structure column foundations, grouting of small gaps such as track foundations, embedding of construction joints in reverse construction of subways, tunnels and underground projects, anchoring of anchor bolts, and reinforcement and repair grouting of concrete beams, columns, slabs and walls. However, the existing grouting materials have relatively low compressive strength and are easily damaged under high-intensity pressure.

[0005] Therefore, it is necessary to provide a new high-performance grouting material based on manufactured sand and a preparation method thereof to solve the above technical problems. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a high-performance grouting material based on manufactured sand and a preparation method thereof.

[0007] The high-performance grouting material based on manufactured sand provided by the present invention is composed of the following components by weight: water: 30-45 parts; portland cement: 60-85 parts; mineral admixture: 10-20 parts; aggregate: 15-20 parts; composite thickener: 2-5 parts; expansive agent: 0.5-1 part; early strength agent: 1-2 parts; water reducing agent: 1-1.5 parts; defoaming agent: 0.5-1 part; water retention agent: 0.1-0.3 part; waterproof agent: 1-1.5 parts; setting retarder: 1-2 parts; antifreeze agent: 0.5-1 part.

[0008] Preferably, the composite thickener includes the following materials by weight: xanthan gum: 1-3 parts; alginate: 2-3 parts; vinyl acetate emulsion: 4-7 parts.

[0009] Preferably, the aggregate includes the following materials by weight: manufactured sand: 10-15 parts; slag: 5-7 parts; glass fiber: 1-2 parts.

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

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

[0012] Preferably, the water reducing agent is a naphthalene-based high-range water reducing agent.

[0013] Preferably, the defoaming agent is a polyether ester defoaming agent.

[0014] A preparation method of a high-performance grouting material based on manufactured sand provided by the second aspect of the present invention, the preparation raw materials of the high-performance grouting material by weight include the above-mentioned water and mixture;

[0015] The specific preparation method includes the following steps:

[0016] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing cylinder to ensure no residual impurities;

[0017] S2: Put the portland cement, mineral admixture, manufactured sand, slag, and glass fiber into the planetary mixer in sequence, add a certain amount of water to the planetary mixer, and use the intermittent stirring method of clockwise and counterclockwise to stir for 5-10 minutes, and the stirring speed is 150-200 revolutions per minute to ensure the preliminary wetting and dispersion of solid particles to form a primary slurry;

[0018] S3: After obtaining the primary slurry, slowly and evenly add early strength agent, water reducer, composite thickener, expansive agent, defoamer, water retention agent, waterproof agent, retarder, and antifreeze agent into the planetary mixer in sequence, and add a certain amount of water synchronously during the addition process. At the same time, keep the stirring speed at 100 - 150 revolutions per minute to enable the additives to be fully dissolved and mixed evenly with the slurry;

[0019] S4: After adding the antifreeze agent, keep the stirring speed at 150 - 200 revolutions per minute and continuously stir for 10 - 15 minutes to ensure full mixing between the additives and the slurry. After the slurry is stirred evenly, gradually increase the stirring speed to 200 - 230 revolutions per minute and stir for 6 - 10 minutes to strengthen the homogeneity of the slurry;

[0020] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain the high-performance grouting material;

[0021] S6: Pour the high-performance grouting material obtained in S5 into the storage container.

[0022] Compared with the related technologies, the high-performance grouting material based on manufactured sand and its preparation method provided by the present invention have the following beneficial effects:

[0023] 1. By adding xanthan gum, alginate, and vinyl acetate emulsion, the present invention can effectively improve the compressive strength of the grouting material. Through the mutual entanglement and interweaving of the long-chain molecules between xanthan gum and vinyl acetate emulsion, a complex network structure is formed, restricting the free movement of particles and molecules inside the material, increasing the viscosity of the grouting material. At the same time, intermolecular crosslinking can be formed between the polymer chains and the polysaccharide substances in alginate. These crosslinking points connect different molecular chains together, thus forming a more stable three-dimensional network structure, making it more viscous. When the viscosity increases, the friction and resistance between the internal particles of the material increase, which makes it more difficult for the material to be compressed or damaged when subjected to external pressure, thereby improving the compressive strength of the grouting material.

[0024] 2. The polymer in the vinyl acetate emulsion added in the present invention can wrap on the solid particles to form a lubricating coating, preventing adhesion between the particles and improving the fluidity of the grouting material. Moreover, the polymer in the vinyl acetate emulsion can also form a protective film to slow down the evaporation of water and maintain the wet state of the grouting material, thereby improving its fluidity.

[0025] 3. By adding alginate, the present invention can absorb the excess water in the grouting material and retain this water to prevent the water from migrating or evaporating too quickly inside the grouting material. At the same time, the wet network structure formed by alginate can effectively delay the release of water and maintain the relative stability of the internal water, which helps the grouting material to maintain a wet state for a long time during the construction process, thereby improving the construction performance and material quality. Detailed implementation manners

[0026] The present invention will be further described below in conjunction with the implementation manners.

[0027] Example 1:

[0028] In the specific implementation process, a high-performance grouting material based on manufactured sand includes the following raw materials by weight:

[0029] Water: 30 parts; Portland cement: 60 parts; Mineral admixture: 10 parts; Aggregate: 15 parts; Compound thickener: 2 parts; Expansive agent: 0.5 part; Early strength agent: 1 part; Water reducing agent: 1 part; Defoaming agent: 0.5 part; Water retention agent: 0.1 part; Waterproof agent: 1 part; Retarding agent: 1 part; Anti-freezing agent: 0.5 part;

[0030] The compound thickener includes the following materials by weight: Xanthan gum: 1 part; Alginate: 2 parts; Vinyl acetate emulsion: 4 parts;

[0031] The aggregate includes the following materials by weight: Manufactured sand: 10 parts; Slag: 5 parts; Glass fiber: 1 part;

[0032] The mineral admixture is a mixture composed of fly ash and silica fume;

[0033] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0034] The water reducing agent is a naphthalene-based high-efficiency water reducing agent;

[0035] The defoaming agent is a polyether ester defoaming agent;

[0036] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0037] The water retention agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0038] The waterproof agent is an organosilicon waterproof agent;

[0039] The retarding agent is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0040] The anti-freezing agent is a mixture composed of sodium chloride, calcium chloride and magnesium chloride;

[0041] The specific preparation method includes the following steps:

[0042] S1: Prepare each material according to the recipe amounts. Prepare a planetary mixer and clean the inner wall of the mixing drum to ensure no residual impurities.

[0043] S2: Sequentially put Portland cement, mineral admixture, manufactured sand, slag, and glass fiber into the planetary mixer, add 10 parts of water to the planetary mixer, and use an intermittent stirring method in clockwise and counterclockwise directions for 5 minutes at a stirring speed of 150 revolutions per minute to ensure that the solid particles are initially wetted and dispersed to form a primary slurry.

[0044] S3: After obtaining the primary slurry, slowly and evenly add early strength agent, naphthalene-based superplasticizer, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoamer, water retention agent, silicone waterproof agent, retarder, and antifreeze agent into the planetary mixer in sequence, and add 20 parts of water synchronously during the addition process, while keeping the stirring speed at 100 revolutions per minute to enable the additives to be fully dissolved and mixed evenly with the slurry.

[0045] S4: After adding the antifreeze agent, keep the stirring speed at 150 revolutions per minute and continuously stir for 10 minutes to ensure full mixing between the additives and the slurry. After the slurry is stirred evenly, gradually increase the stirring speed to 200 revolutions per minute and stir for 6 minutes to strengthen the homogeneity of the slurry.

[0046] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain a high-performance grouting material.

[0047] S6: Pour the high-performance grouting material obtained in S5 into a storage container.

[0048] The mixing process of the composite thickener is as follows:

[0049] (1) Prepare xanthan gum, alginate, and vinyl acetate emulsion according to the recipe amounts, and prepare a clean mixing container.

[0050] (2) Put xanthan gum and alginate into separate containers respectively, add an appropriate amount of water to the containers, and use an intermittent stirring method in clockwise and counterclockwise directions for 5 minutes at a stirring speed of 100 revolutions per minute to completely dissolve xanthan gum and alginate.

[0051] (3) After xanthan gum and alginate are completely dissolved, slowly pour the two into the mixing container and add vinyl acetate emulsion, and stir while adding vinyl acetate emulsion to ensure full mixing between vinyl acetate emulsion, xanthan gum, and alginate.

[0052] (4) After full mixing among vinyl acetate emulsion, xanthan gum, and alginate, gradually reduce the stirring speed until the stirring stops to obtain the composite thickener.

[0053] Example 2:

[0054] In the specific implementation process, a high-performance grouting material based on manufactured sand includes the following raw materials by weight:

[0055] Water: 38 parts; Portland cement: 74 parts; Mineral admixture: 15 parts; Aggregate: 17 parts; Composite thickener: 4 parts; Expansive agent: 0.75 part; Early strength agent: 1.5 parts; Water reducing agent: 1.25 parts; Defoaming agent: 0.75 part; Water retaining agent: 0.2 part; Waterproof agent: 1.3 parts; Retarding agent: 1.4 parts; Antifreeze agent 0.75 part;

[0056] The composite thickener includes the following materials by weight: Xanthan gum: 2 parts; Alginates: 2.5 parts; Vinyl acetate emulsion: 5 parts;

[0057] The aggregate includes the following materials by weight: Manufactured sand: 12.5 parts; Slag: 6 parts; Glass fiber: 1.5 parts;

[0058] The mineral admixture is a mixture composed of fly ash and silica fume;

[0059] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0060] The water reducing agent is a naphthalene-based high-performance water reducing agent;

[0061] The defoaming agent is a polyether ester defoaming agent;

[0062] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0063] The water retaining agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0064] The waterproof agent is an organosilicon waterproof agent;

[0065] The retarding agent is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0066] The antifreeze agent is a mixture composed of sodium chloride, calcium chloride and magnesium chloride.

[0067] The specific preparation method includes the following steps:

[0068] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing cylinder to ensure no residual impurities;

[0069] S2: Put Portland cement, mineral admixture, manufactured sand, slag and glass fiber into the planetary mixer in sequence, add 14 parts of water to the planetary mixer, and adopt the intermittent stirring method of clockwise and counterclockwise for 8 minutes, with the stirring speed of 175 revolutions per minute, to ensure the preliminary wetting and dispersion of solid particles and form a primary slurry;

[0070] S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, naphthalene-based superplasticizer, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoamer, water retention agent, silicone waterproof agent, retarder, and antifreeze agent into the planetary mixer in sequence. During the addition process, add 24 parts of water synchronously, and at the same time, keep the stirring speed at 125 revolutions per minute to enable the additives to be fully dissolved and mixed evenly with the slurry;

[0071] S4: After adding the antifreeze agent, keep the stirring speed at 175 revolutions per minute and continuously stir for 15 minutes to ensure full mixing between the additives and the slurry. After the slurry is stirred evenly, gradually increase the stirring speed to 220 revolutions per minute and stir for 8 minutes to strengthen the homogeneity of the slurry;

[0072] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain the high-performance grouting material;

[0073] S6: Pour the high-performance grouting material obtained in S5 into the storage container.

[0074] Among them, the mixing process of the composite thickener is as follows:

[0075] (1) Prepare xanthan gum, alginate, and vinyl acetate emulsion according to the formula dosages, and prepare a clean stirring container;

[0076] (2) Put xanthan gum and alginate into separate containers respectively, add appropriate amount of water into the containers, and use the intermittent stirring method of clockwise and counterclockwise to stir for 5 minutes with a stirring speed of 100 revolutions per minute to completely dissolve xanthan gum and alginate;

[0077] (3) After xanthan gum and alginate are completely dissolved, slowly pour the two into the stirring container, and add vinyl acetate emulsion. Stir while adding vinyl acetate emulsion to ensure full mixing between vinyl acetate emulsion, xanthan gum, and alginate;

[0078] (4) After full mixing among vinyl acetate emulsion, xanthan gum, and alginate, gradually reduce the stirring speed until the stirring stops to obtain the composite thickener.

[0079] Example 3:

[0080] In the specific implementation process, a high-performance grouting material based on manufactured sand includes the following raw materials by weight parts:

[0081] Water: 45 parts; Portland cement: 85 parts; Mineral admixture: 20 parts; Aggregate: 20 parts; Composite thickener: 5 parts; Expansive agent: 1 part; Early strength agent: 2 parts; Water reducing agent: 1.5 parts; Defoaming agent: 1 part; Water retaining agent: 0.3 part; Waterproofing agent: 1.5 parts; Retarding agent: 2 parts; Antifreezing agent: 1 part;

[0082] The composite thickener includes the following materials by weight: Xanthan gum: 3 parts; Alginate: 3 parts; Vinyl acetate emulsion: 7 parts;

[0083] The aggregate includes the following materials by weight: Manufactured sand: 15 parts; Slag: 7 parts; Glass fiber: 2 parts;

[0084] The mineral admixture is a mixture composed of fly ash and silica fume;

[0085] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0086] The water reducing agent is a naphthalene-based high-range water reducing agent;

[0087] The defoaming agent is a polyether ester defoaming agent;

[0088] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0089] The water retaining agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0090] The waterproofing agent is an organosilicon waterproofing agent;

[0091] The retarding agent is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0092] The antifreezing agent is a mixture composed of sodium chloride, calcium chloride and magnesium chloride.

[0093] The specific preparation method includes the following steps:

[0094] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing drum to ensure no residual impurities;

[0095] S2: Put Portland cement, mineral admixture, manufactured sand, slag and glass fiber into the planetary mixer in sequence, add 20 parts of water to the planetary mixer, and adopt the intermittent stirring method of clockwise and counterclockwise, stir for 10 minutes, and the stirring speed is 200 revolutions per minute to ensure that the solid particles are preliminarily wetted and dispersed to form a primary slurry;

[0096] S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, naphthalene-based superplasticizer, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoamer, water retention agent, silicone waterproofing agent, retarder, and antifreeze agent into the planetary mixer in sequence. During the addition process, add 25 parts of water simultaneously, and keep the stirring speed at 150 revolutions per minute to ensure that the additives can be fully dissolved and evenly mixed with the slurry;

[0097] S4: After adding the antifreeze agent, keep the stirring speed at 200 revolutions per minute and continuously stir for 15 minutes to ensure full mixing between the additives and the slurry. After the slurry is evenly stirred, gradually increase the stirring speed to 230 revolutions per minute and stir for 10 minutes to enhance the homogeneity of the slurry;

[0098] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain the high-performance grouting material;

[0099] S6: Pour the high-performance grouting material obtained in S5 into the storage container.

[0100] Among them, the mixing process of the composite thickener is as follows:

[0101] (1) Prepare xanthan gum, alginate, and vinyl acetate emulsion according to the formula dosages, and prepare a clean stirring container;

[0102] (2) Put xanthan gum and alginate into separate containers respectively, add an appropriate amount of water into the containers, and stir in a clockwise and counterclockwise intermittent stirring manner for 5 minutes at a stirring speed of 100 revolutions per minute to completely dissolve xanthan gum and alginate;

[0103] (3) After xanthan gum and alginate are completely dissolved, slowly pour the two into the stirring container, and add vinyl acetate emulsion. Stir while adding vinyl acetate emulsion to ensure full mixing between vinyl acetate emulsion, xanthan gum, and alginate;

[0104] (4) After full mixing among vinyl acetate emulsion, xanthan gum, and alginate, gradually reduce the stirring speed until the stirring stops to obtain the composite thickener.

[0105] Comparative Example 1:

[0106] A high-performance grouting material based on manufactured sand includes the following raw materials by weight:

[0107] Water: 30 parts; Portland cement: 60 parts; Mineral admixture: 10 parts; Aggregate: 15 parts; Composite thickener: 2 parts; Expansive agent: 0.5 part; Early strength agent: 1 part; Water reducer: 1 part; Defoamer: 0.5 part; Water retention agent: 0.1 part; Waterproofing agent: 1 part; Retarder: 1 part; Antifreeze agent: 0.5 part;

[0108] The composite thickener comprises the following materials in parts by weight: alginate: 2 parts; vinyl acetate emulsion: 4 parts;

[0109] The aggregate comprises the following materials in parts by weight: manufactured sand: 10 parts; slag: 5 parts; glass fiber: 1 part;

[0110] The mineral admixture is a mixture composed of fly ash and silica fume;

[0111] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0112] The water reducing agent is a naphthalene-based high-range water reducing agent;

[0113] The defoaming agent is a polyether ester defoaming agent;

[0114] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0115] The water retaining agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0116] The waterproof agent is an organosilicon waterproof agent;

[0117] The setting retarder is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0118] The antifreeze agent is a mixture composed of sodium chloride, calcium chloride and magnesium chloride.

[0119] The specific preparation method comprises the following steps:

[0120] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing drum to ensure no residual impurities;

[0121] S2: Sequentially put Portland cement, mineral admixture, manufactured sand, slag and glass fiber into the planetary mixer, add 20 parts of water to the planetary mixer, and adopt the intermittent stirring method of clockwise and counterclockwise for 10 minutes, with the stirring speed of 200 revolutions per minute, to ensure the preliminary wetting and dispersion of solid particles and form a primary slurry;

[0122] S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, naphthalene-based high-range water reducing agent, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoaming agent, water retaining agent, organosilicon waterproof agent, setting retarder and antifreeze agent into the planetary mixer in sequence, and add 25 parts of water synchronously during the adding process, while keeping the stirring speed at 150 revolutions per minute to enable the additives to be fully dissolved and mixed uniformly with the slurry;

[0123] S4: After adding the antifreeze agent, maintain the stirring speed at 200 revolutions per minute and continuously stir for 15 minutes to ensure sufficient mixing between the additive and the slurry. After the slurry is evenly stirred, gradually increase the stirring speed to 230 revolutions per minute and stir for 10 minutes to enhance the homogeneity of the slurry;

[0124] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain a high-performance grouting material;

[0125] S6: Pour the high-performance grouting material obtained in S5 into a storage container.

[0126] Among them, the mixing process of the composite thickener is as follows:

[0127] (1) Prepare alginate and vinyl acetate emulsion according to the recipe dosages and prepare a clean stirring container;

[0128] (2) Put the alginate into an independent container, add an appropriate amount of water to the container, and stir in a clockwise and counterclockwise intermittent manner for 5 minutes at a stirring speed of 100 revolutions per minute to completely dissolve the alginate;

[0129] (3) After the alginate is completely dissolved, slowly pour the dissolved alginate into the stirring container and add the vinyl acetate emulsion. Stir while adding the vinyl acetate emulsion to ensure sufficient mixing between the vinyl acetate emulsion and the alginate;

[0130] (4) After sufficient mixing between the vinyl acetate emulsion and the alginate, gradually reduce the stirring speed until the stirring stops to obtain the composite thickener.

[0131] Comparative Example 2:

[0132] A high-performance grouting material based on manufactured sand includes the following raw materials by weight:

[0133] Water: 38 parts; Portland cement: 74 parts; Mineral admixture: 15 parts; Aggregate: 17 parts; Composite thickener: 4 parts; Expansive agent: 0.75 parts; Early strength agent: 1.5 parts; Water reducing agent: 1.25 parts; Defoaming agent: 0.75 parts; Water retaining agent: 0.2 parts; Waterproof agent: 1.3 parts; Retarding agent: 1.4 parts; Antifreeze agent 0.75 parts;

[0134] The composite thickener includes the following materials by weight: Xanthan gum: 2 parts; Alginate: 2.5 parts; Vinyl acetate emulsion: 5 parts;

[0135] The aggregate includes the following materials by weight: Manufactured sand: 12.5 parts; Slag: 6 parts; Glass fiber: 1.5 parts;

[0136] The mineral admixture is a mixture composed of fly ash and silica fume;

[0137] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0138] The water reducer is a naphthalene-based superplasticizer;

[0139] The defoaming agent is a polyether ester defoaming agent;

[0140] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0141] The water retention agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0142] The waterproof agent is an organosilicon waterproof agent;

[0143] The retarding agent is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0144] The antifreeze agent is a mixture composed of sodium chloride, calcium chloride and magnesium chloride.

[0145] The specific preparation method includes the following steps:

[0146] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing barrel to ensure no residual impurities;

[0147] S2: Put Portland cement, mineral admixture, manufactured sand, slag and glass fiber into the planetary mixer in sequence, add 14 parts of water to the planetary mixer, and use the intermittent stirring method in clockwise and counterclockwise directions, stir for 8 minutes, and the stirring speed is 175 revolutions per minute to ensure that the solid particles are initially wetted and dispersed to form a primary slurry;

[0148] S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, naphthalene-based superplasticizer, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoaming agent, water retention agent, organosilicon waterproof agent, retarding agent and antifreeze agent into the planetary mixer in sequence, and add 24 parts of water synchronously during the addition process, and keep the stirring speed at 125 revolutions per minute to make the additives fully dissolve and mix evenly with the slurry;

[0149] S4: After adding the antifreeze agent, keep the stirring speed at 175 revolutions per minute and continue to stir for 15 minutes to ensure full mixing between the additives and the slurry. After the slurry is stirred evenly, gradually increase the stirring speed to 220 revolutions per minute and stir for 8 minutes to strengthen the homogeneity of the slurry;

[0150] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain a high-performance grouting material;

[0151] S6: Pour the high-performance grouting material obtained in S5 into a storage container.

[0152] Among them, the mixing process of the composite thickener is as follows:

[0153] (1) Prepare xanthan gum and vinyl acetate emulsion according to the recipe dosage, and prepare a clean stirring container;

[0154] (2) Put the xanthan gum into an independent container, add an appropriate amount of water to the container, and stir in a clockwise and counterclockwise intermittent stirring manner for 5 minutes at a stirring speed of 100 revolutions per minute until the xanthan gum is completely dissolved;

[0155] (3) After the xanthan gum is completely dissolved, slowly pour the two into the stirring container, and add the vinyl acetate emulsion. Stir while adding the vinyl acetate emulsion to ensure full mixing between the vinyl acetate emulsion and the xanthan gum;

[0156] (4) After the vinyl acetate emulsion and the xanthan gum are fully mixed, gradually reduce the stirring speed until the stirring stops to obtain the composite thickener.

[0157] Comparative Example 3:

[0158] In the specific implementation process, a high-performance grouting material based on manufactured sand includes the following raw materials by weight:

[0159] Water: 45 parts; Portland cement: 85 parts; Mineral admixture: 20 parts; Aggregate: 20 parts; Composite thickener: 5 parts; Expansive agent: 1 part; Early strength agent: 2 parts; Water reducing agent: 1.5 parts; Defoaming agent: 1 part; Water retaining agent: 0.3 part; Waterproof agent: 1.5 parts; Retarding agent: 2 parts; Antifreeze agent: 1 part;

[0160] The composite thickener includes the following materials by weight: xanthan gum: 3 parts; alginate: 3 parts; vinyl acetate emulsion: 7 parts;

[0161] The aggregate includes the following materials by weight: manufactured sand: 15 parts; slag: 7 parts; glass fiber: 2 parts;

[0162] The composite thickener is vinyl acetate emulsion;

[0163] The mineral admixture is a mixture composed of fly ash and silica fume;

[0164] The expansive agent is a calcium sulfoaluminate-based expansive agent;

[0165] The water reducing agent is a naphthalene-based high-efficiency water reducing agent;

[0166] The defoaming agent is a polyether ester defoaming agent;

[0167] The early strength agent is a mixture composed of triethanolamine and calcium formate;

[0168] The water retaining agent is a mixture composed of hydroxyethyl methyl cellulose ether and hydroxyethyl cellulose;

[0169] The waterproofing agent is an organosilicon waterproofing agent;

[0170] The retarder is a mixture composed of sodium pyrophosphate, methylene phosphonic acid and polyphosphate;

[0171] The antifreeze is a mixture composed of sodium chloride, calcium chloride and magnesium chloride.

[0172] The specific preparation method includes the following steps:

[0173] S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing drum to ensure that there are no residual impurities;

[0174] S2: Put Portland cement, mineral admixture, manufactured sand, slag and glass fiber into the planetary mixer in sequence, add 20 parts of water to the planetary mixer, and use the intermittent stirring method of clockwise and counterclockwise to stir for 10 minutes, and the stirring speed is 200 revolutions per minute to ensure that the solid particles are initially wetted and dispersed to form a primary slurry;

[0175] S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, naphthalene-based superplasticizer, composite thickener, calcium sulfoaluminate-based expansive agent, polyether ester defoamer, water retention agent, organosilicon waterproofing agent, retarder and antifreeze into the planetary mixer in sequence, and add 25 parts of water synchronously during the addition process, and keep the stirring speed at 150 revolutions per minute to make the additives fully dissolve and mix evenly with the slurry;

[0176] S4: After adding the antifreeze, keep the stirring speed at 200 revolutions per minute and continue to stir for 15 minutes to ensure that the additives and the slurry are fully mixed. After the slurry is stirred evenly, gradually increase the stirring speed to 230 revolutions per minute and stir for 10 minutes to strengthen the homogeneity of the slurry;

[0177] S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain a high-performance grouting material;

[0178] S6: Pour the high-performance grouting material obtained in S5 into a storage container.

[0179] Experiment 1:

[0180] Now, test the high-performance grouting materials prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2 and Comparative Example 3, and measure their fluidity, compressive strength, bleeding rate and durability. The specific test results are as follows:

[0181]

[0182] Table 1

[0183] As can be seen from the above table, when xanthan gum, alginate, and vinyl acetate emulsion are added, the compressive strength of the grouting material can be effectively improved. Since xanthan gum and vinyl acetate emulsion are both polymer compounds, their long-chain molecules can entangle and interweave with each other in the solution to form a complex network structure. This network structure restricts the free movement of particles and molecules inside the material, thereby increasing the viscosity of the grouting material. At the same time, intermolecular cross-links can form between the polymer chains and the polysaccharide substances in alginate, and these cross-linking points connect different molecular chains together, thus forming a more stable three-dimensional network structure, increasing the cohesion of the material and making it more viscous. When the viscosity increases, the friction and resistance between the particles inside the material increase, which makes it more difficult for the material to be compressed or damaged when subjected to external pressure, thereby improving the compressive strength of the grouting material;

[0184] Moreover, the polymer in the added vinyl acetate emulsion can coat the solid particles to form a lubricating coating, further preventing the adhesion between the particles and improving the fluidity of the grouting material. Xanthan gum and alginate can adsorb on the surface of the solid particles in the grouting material to form a protective film, preventing the agglomeration between the particles, thereby improving the dispersibility of the particles. At the same time, the polymer in the vinyl acetate emulsion can also form a protective film to slow down the evaporation of water and maintain the wet state of the grouting material, thereby improving its fluidity;

[0185] Because alginate is composed of multiple tiny, porous particles or fibers, these micropores can absorb the excess water in the grouting material and retain this water through its internal microporous structure, preventing the rapid migration or evaporation of water inside the grouting material. At the same time, the wet network structure formed by alginate can effectively delay the release of water and maintain the relative stability of the internal water, helping the grouting material to maintain a wet state for a longer time during the construction process, thereby improving the construction performance and material quality. And by adding alginate, the dosage of the water retention agent can also be reduced.

[0186] The above shows and describes the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0187] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style 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 high-performance grouting material based on manufactured sand, characterized in that, The high-performance grouting material is composed of the following components by weight: water: 30 - 45 parts; portland cement: 60 - 85 parts; mineral admixture: 10 - 20 parts; aggregate: 15 - 20 parts; composite thickener: 2 - 5 parts; expansive agent: 0.5 - 1 part; early strength agent: 1 - 2 parts; water reducer: 1 - 1.5 parts; defoamer: 0.5 - 1 part; water retention agent: 0.1 - 0.3 part; waterproof agent: 1 - 1.5 parts; setting retarder: 1 - 2 parts; antifreeze: 0.5 - 1 part.

2. The high-performance grouting material based on manufactured sand according to claim 1, wherein The composite thickener includes the following materials by weight: xanthan gum: 1 - 3 parts; alginate: 2 - 3 parts; vinyl acetate emulsion: 4 - 7 parts.

3. The high-performance grouting material based on manufactured sand according to claim 1, characterized in that, The aggregate includes the following materials by weight: manufactured sand: 10 - 15 parts; slag: 5 - 7 parts; glass fiber: 1 - 2 parts.

4. The high-performance grouting material based on manufactured sand according to claim 1, characterized in that, The mineral admixture is one or a mixture of two or more of fly ash, silica fume, slag powder, and microsilica.

5. The high-performance grouting material based on manufactured sand according to claim 1, characterized in that, The expansive agent is one or a mixture of two of calcium sulfoaluminate-based expansive agent or magnesium oxide expansive agent.

6. The high-performance grouting material based on manufactured sand according to claim 1, characterized in that, The water reducer is a naphthalene-based high-performance water reducer.

7. The high-performance grouting material based on manufactured sand according to claim 1, characterized in that, The defoamer is a polyether ester defoamer.

8. A preparation method of a high-performance grouting material based on manufactured sand according to any one of claims 1-7, characterized in that, The specific preparation method includes the following steps: S1: Prepare each material according to the formula, prepare a planetary mixer, and clean the inner wall of the mixing barrel to ensure no residual impurities. S2: Sequentially put portland cement, mineral admixture, manufactured sand, slag, and glass fiber into the planetary mixer, add a certain amount of water to the planetary mixer, and use the intermittent stirring method in clockwise and counterclockwise directions, stir for 5 - 10 minutes, and the stirring speed is 150 - 200 revolutions per minute to ensure the preliminary wetting and dispersion of solid particles and form a primary slurry. S3: After obtaining the primary slurry, slowly and evenly add the early strength agent, water reducer, composite thickener, expansive agent, defoamer, water retention agent, waterproof agent, setting retarder, and antifreeze into the planetary mixer in sequence, and add a certain amount of water synchronously during the addition process, while keeping the stirring speed at 100 - 150 revolutions per minute to make the additives fully dissolve and mix evenly with the slurry. S4: After adding the antifreeze, keep the stirring speed at 150 - 200 revolutions per minute and continuously stir for 10 - 15 minutes to ensure full mixing between the additives and the slurry. After the slurry is stirred evenly, gradually increase the stirring speed to 200 - 230 revolutions per minute and stir for 6 - 10 minutes to strengthen the homogeneity of the slurry. S5: After sufficient stirring, gradually reduce the stirring speed until the stirring stops to obtain the high-performance grouting material. S6: Pour the high-performance grouting material obtained in S5 into a storage container.

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