Lightweight high-strength repair mortar as well as raw materials and application thereof

Abstract

The invention provides raw materials of light high-strength repairing mortar and application of the raw materials in building construction surface repairing, and the raw materials of the light high-strength repairing mortar comprise the following components in percentage by mass: 40-65% of a hydraulic cementing material, 5-10% of a water reducing agent, 1-5% of a water reducing agent, 1-5% of a water reducing agent and 1-5% of a water reducing agent, 20%-40% of lightweight aggregate; 0%-20% of a fine filler; 0.1%-1.5% of a thixotropic agent; and 0.1%-5.5% of an auxiliary agent.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of repair mortar, in particular to a lightweight high-strength repair mortar, raw materials and applications thereof, and more particularly to a lightweight high-strength repair mortar, raw materials and applications thereof in repairing construction surfaces. BACKGROUND

[0002] Repair mortar is widely used in surface repair, gap filling and structure reinforcement of concrete or cement components. Due to differences in environmental conditions and construction methods, the performance requirements of repair mortar vary significantly in different construction parts of buildings, such as floors, walls and roofs. In particular, in the scenario of inverted face construction, such as roof and vault parts, traditional repair mortar faces technical difficulties such as material falling, difficulty in thick coating construction, insufficient strength, laborious construction operation, etc., resulting in low construction efficiency, high cost and poor durability, which is difficult to meet the diversified engineering needs. SUMMARY

[0003] Therefore, in order to at least partially solve one of the above-mentioned technical problems, the present disclosure provides a lightweight high-strength repair mortar, raw materials and applications thereof.

[0004] According to an embodiment of one aspect of the present disclosure, a raw material of a lightweight high-strength repair mortar is provided, the raw material is calculated by mass percentage, and the total is 100%, comprising:

[0005] hydraulic cementitious material 40%~65%;

[0006] lightweight aggregate 20%~40%;

[0007] fine filler 0%~20%;

[0008] thixotropic agent 0.1%~1.5%

[0009] auxiliary agent 1.1%~10.5%.

[0010] According to an embodiment of another aspect of the present disclosure, a lightweight high-strength repair mortar is provided, comprising:

[0011] water and the raw material of the above lightweight high-strength repair mortar, wherein the mass percentage of water is 10%~30% of the total mass of the lightweight high-strength repair mortar.

[0012] According to an embodiment of still another aspect of the present disclosure, an application of the above lightweight high-strength repair mortar in repairing construction surfaces is provided.

[0013] According to the embodiment of the present disclosure, a raw material of light-weight high-strength repair mortar is provided, light-weight aggregate is selected to reduce the density of the matrix, and hydraulic cementitious material is matched to build a rapid setting system, and fine filler is used to fill the pores in the raw material at the same time, so as to reduce the self-weight while enhancing the internal density. The raw materials form a synergistic effect through accurate proportioning, so that the repair mortar has the characteristics of light weight, high strength and rapid setting, and is especially suitable for repair work on the upward parts of buildings. DETAILED DESCRIPTION

[0014] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments.

[0015] The endpoints of the ranges and any values disclosed in the present disclosure are not limited to the precise values recited. The ranges or values should be interpreted as being approximate, and include values near the recited values. For numeric values, the endpoints of each range, the endpoints of each range and individual point values, and individual point values can be combined with each other to form one or more new numeric ranges, which should be considered as being specifically disclosed in the present disclosure.

[0016] The terms used herein are only used to describe specific embodiments, and are not intended to limit the present disclosure. The terms "include", "contain" and the like used herein indicate the existence of the described features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0017] In building maintenance and repair engineering, when different construction surfaces of buildings are repaired and coated, the performance requirements of repair mortar are significantly different due to the differences in the characteristics of the construction site. Especially in the upward construction scene of the roof, the traditional repair mortar is affected by gravity, and the single construction thickness is insufficient, which requires multiple operations, resulting in low efficiency, high labor and time cost. The conventional light-weight repair material is difficult to withstand external impact and environmental load due to poor strength, and is prone to damage and fall off. At the same time, the construction personnel need to overcome the material self-weight and gravity to exert force upward, resulting in laborious construction operation, high labor intensity and difficulty in ensuring construction quality.

[0018] To this end, the present disclosure proposes a lightweight high-strength repair mortar, which can solve the above-mentioned overhead construction problem through the proportioning and functional synergy of the repair mortar raw materials. The high-strength lightweight aggregate with a porous structure is used to reduce the density while ensuring the mechanical properties; the rapid cementitious material is used to accelerate the hardening and molding, shorten the setting time, and reduce the influence of gravity on the mortar; the micro-filling effect of the fine filler is used to improve the compactness and adhesion of the mortar; the rheological properties are synergistically regulated by the thixotropic agent and functional additives, further improving the construction anti-vertical hanging property and operation smoothness. The repair mortar can realize the performance of lightweight, high strength, fast setting, and easy construction at the same time, and when used for overhead construction, it can not only greatly improve the single coating thickness, but also reduce the operation difficulty. In addition, the raw materials of the repair mortar are all powdery materials, do not contain organic solvents and resin substances, are green and environmentally friendly, can be batched and coated after being mixed with water into a slurry, are easy to operate, and provide an efficient and reliable solution for building repair projects.

[0019] According to an embodiment of one aspect of the present disclosure, a raw material of a lightweight high-strength repair mortar is provided, the total amount of which is 100% in mass percentage, comprising:

[0020] hydraulic cementitious material 40%-65%;

[0021] lightweight aggregate 20%-40%;

[0022] fine filler 0%-20%;

[0023] thixotropic agent 0.1%-1.5%

[0024] additive 1.1%-10.5%.

[0025] According to an embodiment of the present disclosure, the mass percentage of the hydraulic cementitious material may, for example, be 40%, 45%, 50%, 55%, 60%, 65%, etc. A proportion lower than 40% will result in insufficient strength, and a proportion higher than 65% will result in decreased fluidity and increased setting time during construction. The mass percentage of the lightweight aggregate may, for example, be 20%, 25%, 30%, 35%, 40%, etc. A proportion that is too low will have poor weight reduction effect, and a proportion that is too high will result in decreased mechanical properties. The mass percentage of the fine filler may, for example, be 0%, 1%, 5%, 10%, 15%, 20%, etc. Too little fine filler will not be able to fully fill the pores between the raw materials, and too much fine filler will affect the strength of the repair mortar. The mass percentage of the thixotropic agent may, for example, be 0.1%, 0.5%, 1%, 1.3%, 1.5%, etc. A proportion lower than 0.1% will result in insufficient anti-vertical hanging property, and a proportion higher than 1.5% will result in too much construction resistance. The mass percentage of the additive may, for example, be 1.1%, 1.5%, 2%, 5%, 7%, 10%, 10.5%, etc. A proportion that is too low will not be able to function, and a proportion that is too high will increase the cost and may have adverse effects, such as decreased strength.

[0026] According to the embodiments of the present disclosure, by the selection and proportioning of raw materials, lightweight high-strength repair mortar raw materials capable of rapid setting are obtained. Specifically, first, lightweight aggregates with high strength and low density characteristics are selected, and the porous or hollow structure of the lightweight aggregates can effectively reduce the density of the repair mortar and reduce the mass of the repair mortar; at the same time, a hydraulic cementing material is matched to build a rapid setting system, and the hydraulic cementing material can rapidly hydrate and harden after being contacted with water. On this basis, fine fillers with small particle size and large specific surface area are introduced, which can fully fill the hollow structure of the lightweight aggregates and the pores between other raw material components, eliminate internal defects, make the structure of the repair mortar more compact, and improve the bonding performance of the repair mortar. In addition, the thixotropic agent and other functional additives synergistically act to further regulate the rheological properties and bonding strength of the repair mortar, so that the repair mortar is more smooth and not prone to flowing or falling. The raw materials are precisely proportioned and closely synergized to realize the lightweight, high-strength and rapid setting characteristics of the repair mortar.

[0027] According to the embodiments of the present disclosure, the hydraulic cementing material is selected from one or more of Portland cement and sulphoaluminate cement, which generates hydrated calcium silicate, hydrated calcium sulphate and other cementitious substances by hydrating with water. These cementitious substances can firmly bond the components such as lightweight aggregates and fine fillers into a whole, not only promoting the rapid setting and hardening of the repair mortar, but also providing the repair mortar with basic mechanical properties such as compressive strength and flexural strength, ensuring that the repair mortar has good structural stability and bearing capacity.

[0028] The lightweight aggregate includes any one or more of hollow ceramic particles, lightweight sand and hollow glass beads. The lightweight aggregate itself has a certain strength and a porous structure. By utilizing this characteristic, on the one hand, the density of the repair mortar matrix can be effectively reduced to achieve the lightweight effect; on the other hand, the porous structure can absorb part of the water during construction, significantly reducing the bleeding and segregation problems of the repair mortar, optimizing the construction performance, making the repair mortar easier to apply and paste, and thus improving the construction efficiency and quality.

[0029] The fine filler includes any one or more of quartz powder, heavy calcium and talc powder. The particle size of the fine filler is 280-1250 mesh, for example, it can be 280 mesh, 300 mesh, 500 mesh, 1000 mesh, 1250 mesh, etc., which can be adjusted according to actual needs. Due to its small particle size, the fine filler can fill the pores between the hydration products of the hydraulic cementing material and the lightweight aggregate, as well as the pores in the lightweight aggregate itself, making the structure of the repair mortar more compact and further improving the bonding property of the mortar. In addition, different fine fillers have different physical and chemical properties, which can be targeted to optimize the performance of the mortar. For example, talc powder has a lubricating effect, which can improve the construction and workability of the repair mortar, making it smoother; quartz powder has high hardness, which can improve the wear resistance of the repair mortar, etc.

[0030] The thixotropic agent includes any one or more of attapulgite, kaolin, bentonite and modified products thereof. The thixotropic agent has a layered or fibrous structure, and can form a colloidal network after the repair mortar swells after absorbing water, thereby inhibiting the sedimentation of other component solid particles through physical entanglement and adsorption, and avoiding the stratification of the mortar during storage and construction. At the same time, the network structure can improve the consistency of the mortar, so that the mortar has good anti-flowing and anti-sliding performance during construction, and significantly improves the construction forming quality and structural stability.

[0031] According to an embodiment of the present disclosure, the auxiliary agent includes: redispersible glue powder, alkali-activated cementitious material, water-retaining thickening material, and the performance of the repair mortar is further optimized through the synergistic effect of each auxiliary component. In actual application, other modified auxiliary agents can be added to the repair mortar raw materials according to application requirements.

[0032] According to an embodiment of the present disclosure, the mass percentage of the redispersible glue powder is 1% to 5%, for example, it can be 1%, 2%, 3%, 4%, 5%, etc., and specifically includes any one or more of VAE glue powder and acrylic glue powder. After the repair mortar is mixed with water, the glue powder particles are dispersed into an emulsion, and a continuous polymer film is formed after drying and curing, which can not only significantly improve the bonding strength between the mortar and the base material, but also improve the flexibility of the mortar due to its elasticity and ductility, so that it can adapt to slight deformation of the base layer, effectively reducing the cracking problem caused by shrinkage, temperature change and other factors. In addition, the glue powder material has excellent water resistance, which can improve the bonding strength and durability of the mortar in a humid environment and avoid performance degradation due to water erosion.

[0033] The mass percentage of the alkali-activated cementitious material is 0 to 5%, for example, it can be 0%, 1%, 2%, 3%, 4%, 5%, etc., and preferably a polymer material, specifically including any one or more of silica fume, fly ash and mineral powder. In the alkaline environment generated by the hydration of the hydraulic cementitious material, the alkali-activated cementitious material can react with substances such as calcium hydroxide to generate secondary hydration products to fill pores and enhance interfacial bonding, thereby further improving the strength and density of the repair mortar. At the same time, the above-mentioned geopolymer material can be extracted from industrial waste residues, which can reduce production costs and realize the resource utilization of solid waste.

[0034] The mass percentage of the water-retention thickening material is 0.1% to 0.5%, for example, can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc., preferably a cellulose ether material, specifically including any one or more of hydroxyethyl cellulose ether, hydroxypropyl cellulose ether, and hydroxypropyl methyl cellulose ether. The hydroxyl groups in the cellulose ether molecules can form hydrogen bonds with water molecules, thereby locking the water in the mortar, avoiding the water being absorbed by the substrate too quickly or evaporated, ensuring that the hydraulic cementitious material has sufficient water for hydration reaction, thereby ensuring the strength and adhesion performance of the repair mortar. In addition, the cellulose ether can also increase the viscosity of the repair mortar, making it more smooth during troweling and masonry, and can also prolong the setting time of the mortar to a certain extent, providing more operation time for large-area construction or complex processes.

[0035] According to an embodiment of another aspect of the present disclosure, a lightweight high-strength repair mortar is provided, including: water and raw materials of the above lightweight high-strength repair mortar, wherein the mass percentage of water is 10% to 30% of the total mass of the lightweight high-strength repair mortar.

[0036] According to an embodiment of the present disclosure, the mass percentage of water can be 10%, 15%, 20%, 25%, 30%, etc. of the total mass of the repair mortar. In actual application, the amount of water added needs to be adjusted according to the construction consistency requirement and the water absorption of the raw materials. Too much water will dilute the concentration of the raw materials, resulting in a decrease in the strength of the repair mortar. In addition, due to the strong water absorption of the porous structure of the lightweight aggregate, additional water is needed to meet the pore filling and construction fluidity requirements, so the amount of water added increases accordingly with the increase in the amount of lightweight aggregate added.

[0037] According to an embodiment of the present disclosure, the lightweight high-strength repair mortar of the present disclosure does not need to add other solvents or complex additives, but can be directly batched and coated by adding water in proportion. The operation process is simple and easy to master. At the same time, the amount of water can be dynamically adjusted according to the construction consistency requirement and the water absorption of the raw materials, so that the repair mortar can exhibit good plasticity under different working conditions, taking into account the construction efficiency and the compactness of the repair layer, providing a solution with reliability, convenience and flexibility for building overhead repair.

[0038] According to an embodiment of the present disclosure, the density of the repair mortar is 1400 kg / m 3 ~1800 kg / m 3 , which is lower than the density of the traditional repair mortar 2100 kg / m 3The density is reduced by more than 30%, so that the quality is lighter at the same thickness, and the gravity of the repair mortar after the upward construction is prevented from falling. Compared with the traditional lightweight repair mortar added with perlite, expanded microbeads and the like, the lightweight high-strength repair mortar is not easy to break under external force, and the compressive strength reaches 20 MPa-60 MPa, and the bending strength can reach 5 MPa-10 MPa. In addition, according to the test method in JC / T1381-2016 'Repair Mortar', the bonding strength of the repair mortar can reach 1 MPa-5 MPa. The double balance of high strength and low density is achieved, and the performance advantages of light weight, high strength and easy construction are achieved.

[0039] According to an embodiment of the present disclosure, the application provides the use of the above-mentioned lightweight high-strength repair mortar in the repair of a building construction surface.

[0040] According to an embodiment of the present disclosure, the lightweight high-strength repair mortar of the present disclosure has the comprehensive performance advantages of lightweight, high strength, rapid setting and easy construction, and can be widely used in the repair operation of complex construction surfaces such as roofs, ceilings, facades and top surfaces of buildings.

[0041] According to an embodiment of the present disclosure, the building construction surface includes a ground surface, a vertical surface and an upward surface. The lightweight high-strength repair mortar of the present disclosure is suitable for various application scenarios of different construction surfaces. When the ground surface is constructed, the high strength is met while avoiding the structural burden caused by the thickness of the traditional repair mortar; when the vertical surface is constructed, the lightweight repair mortar can prevent the downward falling from affecting the forming quality, and the strong interfacial adhesion ensures the firm combination with the wall surface base material; especially in the upward construction, the three synergies of reducing the self-weight by lightweight aggregate, realizing rapid hardening by rapid setting cementitious material, and constructing the anti-vertical hanging network by thixotropic agent solve the problems of multiple construction, insufficient strength and laborious operation of traditional materials, and at the same time, the flexibility and water resistance of the material itself can adapt to the environmental changes of different construction surfaces, and the long-term durability is ensured.

[0042] According to an embodiment of the present disclosure, when the upward construction is repaired, the one-time coating thickness of the lightweight high-strength repair mortar is 10 mm-20 mm. It is labor-saving and smooth, can realize one-time thick coating construction, greatly improves the construction efficiency, and saves at least 50% of working hours.

[0043] In order to make the purpose, technical scheme and advantages of the present disclosure more clear and clear, the present disclosure will be further described in detail below in combination with specific embodiments. If the specific technology or condition is not indicated in the embodiments, it is a conventional method, which can be carried out according to the technology or condition described in the literature in the art or according to the product instruction. It should be noted that the method provided by the present disclosure is a conventional method unless otherwise specified, and the reactants and reagents can be obtained from the public commercial channel unless otherwise specified.

[0044] Embodiment 1

[0045] The embodiment provides a light-weight high-strength repair mortar for ceiling construction, and the raw materials of the repair mortar are calculated according to mass percentage, and the total is 100%, and the repair mortar comprises the following components:

[0046] Ordinary Portland cement 40%;

[0047] Hollow ceramic particles 35%;

[0048] Quartz powder 20%;

[0049] VAE glue powder 3%;

[0050] Silica fume 1.2%;

[0051] Attapulgite 0.5%;

[0052] Hydroxypropyl methyl cellulose ether 0.3%.

[0053] After the above raw materials are uniformly mixed and stirred according to the proportion of each raw material, 22% of water of the total mass of the repair mortar is added, and the slurry repair mortar 1 is prepared.

[0054] The density of the repair mortar 1 is 1520 kg / m 3 , the one-time ceiling scraping thickness is 15 mm, there is no flow and no falling. According to the test method in JC / T1381-2016 'Repair Mortar', the compressive strength of the repair mortar 1 is 35 MPa, and the bonding strength is 1.5 MPa.

[0055] Embodiment 2

[0056] The embodiment provides a light-weight high-strength repair mortar for ceiling construction, and the raw materials of the repair mortar are calculated according to mass percentage, and the total is 100%, and the repair mortar comprises the following components:

[0057] Ordinary Portland cement 25%;

[0058] Sulphoaluminate cement 15%;

[0059] Lightweight sand 20%;

[0060] Hollow vitrified microsphere 20%;

[0061] Heavy calcium 16%;

[0062] Acrylic glue powder 2%;

[0063] Modified bentonite 1.5%;

[0064] Hydroxyethyl cellulose ether 0.5%.

[0065] After the above raw materials are uniformly mixed and stirred according to the proportion of each raw material, 25% of water of the total mass of the repair mortar is added, and the slurry repair mortar 2 is prepared.

[0066] The density of the repair mortar 2 is 1440 kg / m 3 The one-time back-scratching thickness is 20 mm, without dripping and falling. According to the test method in JC / T1381-2016 “Repair Mortar”, the compressive strength of the repair mortar 2 is 28 MPa, and the bonding strength is 1.3 MPa.

[0067] Example 3

[0068] The embodiment provides a light-weight high-strength repair mortar for back-scratching construction. The raw materials of the repair mortar are calculated by mass percentage, and the total is 100%, including:

[0069] Ordinary Portland cement 40%;

[0070] Sulphoaluminate cement 25%;

[0071] Lightweight sand 20%;

[0072] Talc powder 10%;

[0073] VAE glue powder 1%;

[0074] Mineral powder 3%;

[0075] Kaolin 0.8%;

[0076] Hydroxypropyl methylcellulose ether 0.2%.

[0077] After the above raw materials are mixed and stirred uniformly according to the proportion of each raw material, 20% of the total mass of the repair mortar is added to water to prepare a slurry-like repair mortar 3.

[0078] The density of the repair mortar 3 is 1650 kg / m 3 The one-time back-scratching thickness is 10 mm, without dripping and falling. According to the test method in JC / T1381-2016 “Repair Mortar”, the compressive strength of the repair mortar 3 is 52 MPa, and the bonding strength is 1.9 MPa.

[0079] Comparative Example 1

[0080] The comparative example provides a repair mortar. The raw materials of the repair mortar are calculated by mass percentage, and the total is 100%, including:

[0081] Ordinary Portland cement 30%;

[0082] Sulphoaluminate cement 15%;

[0083] 40~70 mesh river sand 20%;

[0084] 70~140 mesh river sand 30%;

[0085] VAE powder 3%;

[0086] Bentonite 1.8%;

[0087] Hydroxypropyl methyl cellulose ether 0.2%.

[0088] The above raw materials are mixed and stirred uniformly according to the proportion of each raw material, and then 15% of water of the total mass of the repair mortar is added to prepare slurry repair mortar 4.

[0089] The density of the repair mortar 4 is 2160kg / m 3 The repair mortar of Comparative Example 1 does not use lightweight aggregate, and its density is significantly higher than that of the repair mortars using lightweight aggregate in Examples 1-3, and the one-time overhead coating thickness is only 3mm, without flowing and falling. According to the test method in JC / T1381-2016 "Repair Mortar", the compressive strength of the repair mortar 4 is 57MPa, and the bonding strength is 1.4MPa.

[0090] Comparative Example 2

[0091] This comparative example provides a repair mortar, the raw materials of the repair mortar are calculated by mass percentage, totaling 100%, including:

[0092] Ordinary Portland cement 45%;

[0093] Hollow ceramic particles 40%;

[0094] Heavy calcium 10%;

[0095] Acrylic powder 1%;

[0096] Fly ash 3.7%;

[0097] Hydroxypropyl methyl cellulose ether 0.3%.

[0098] The above raw materials are mixed and stirred uniformly according to the proportion of each raw material, and then 25% of water of the total mass of the repair mortar is added to prepare slurry repair mortar 5.

[0099] The density of the repair mortar 5 is 1470kg / m 3 The one-time overhead coating thickness is 5mm, which is significantly lower than that of the repair mortars using thixotropic agents in Examples 1-3, and there is no flowing and falling. According to the test method in JC / T1381-2016 "Repair Mortar", the compressive strength of the repair mortar 5 is 7.8MPa, and the bonding strength is 0.3MPa, both of which are at a lower level.

[0100] Comparative Example 3

[0101] This comparative example provides a repair mortar, the raw materials of the repair mortar are calculated by mass percentage, totaling 100%, including:

[0102] Desulfurized gypsum 40%;

[0103] Hollow ceramic particles 35%;

[0104] Heavy calcium 20%;

[0105] VAE glue powder 3%;

[0106] Silica fume 1.2%;

[0107] Bentonite 0.5%;

[0108] Hydroxypropyl methyl cellulose ether 0.3%.

[0109] After the above raw materials are mixed and stirred uniformly according to the proportion of each raw material, 30% of water of the total mass of the repair mortar is added to prepare the slurry repair mortar 6.

[0110] The density of the repair mortar 6 is 1490 kg / m 3 , the thickness of one-time upward scraping is 15 mm, there is no flow and no falling. According to the test method in JC / T1381-2016 “Repair Mortar”, the compressive strength of the repair mortar 6 is 12 MPa, the bonding strength is 0.5 MPa, the repair mortar using desulfurized gypsum instead of hydraulic cementitious material lacks sustained stability in the hydration and hardening process, and the compressive strength and bonding strength are low.

[0111] The present disclosure utilizes lightweight aggregates with high strength, fast-setting cementitious hydraulic materials, and thixotropic agents and other raw materials to prepare lightweight high-strength repair mortar through synergistic effect, which has multiple performance advantages: the density of the lightweight high-strength repair mortar is reduced by more than 30% compared with ordinary repair mortar, the mass is significantly reduced under the same thickness, and the problem of material falling caused by gravity during upward construction can be solved; compared with traditional lightweight mortar added with perlite and expanded microbeads, the lightweight high-strength repair mortar has a compressive strength of 20 MPa~60 MPa and a flexural strength of 5 MPa~10 MPa, and outstanding anti-impact performance, and is not easy to break and damage; the repair mortar of the present disclosure is smoother and more fluent during construction, and is labor-saving to operate, especially for upward construction scenes, the single upward scraping thickness can reach 10 mm~20 mm or even thicker, and compared with traditional processes, the construction efficiency and forming quality are greatly improved.

[0112] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure, and it should be understood that the above-described specific embodiments are only specific embodiments of the present disclosure and are not used to limit the present disclosure, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A raw material for a lightweight, high-strength repair mortar, characterized in that, The raw materials, calculated by weight percentage and totaling 100%, comprise: Hydraulic cementitious materials: 40%~65%; Lightweight aggregates: 20%–40%; Fine filler 0%~20%; Thixotropic agent 0.1%~1.5% Additives: 1.1%~10.5%.

2. The raw material according to claim 1, characterized in that, The lightweight aggregate includes any one or more of hollow ceramic particles, lightweight sand, and hollow vitrified microspheres; The hydraulic cementitious material includes any one or more of silicate cement and sulfoaluminate cement; The fine filler includes any one or more of quartz powder, heavy calcium carbonate, and talc powder, and the particle size of the fine filler is 280~1250 mesh. The thixotropic agent includes any one or more of attapulgite, kaolin, bentonite, and their modifiers.

3. The raw material according to claim 1, characterized in that, The additives include: redispersible polymer powder, alkali-activated gelling material, and water-retaining thickening material.

4. The raw material according to claim 3, characterized in that, The redispersible polymer powder has a mass percentage of 1% to 5%; The mass percentage of the alkali-activated cementitious material is 0-5%; The water-retaining and thickening material has a mass percentage of 0.1% to 0.5%.

5. The raw material according to claim 3, characterized in that, The redispersible adhesive powder includes any one or more of VAE adhesive powder and acrylic adhesive powder; The alkali-activated cementitious material includes any one or more of silica fume, fly ash, and mineral powder. The water-retaining and thickening material includes any one or more of hydroxyethyl cellulose ether, hydroxypropyl cellulose ether, and hydroxypropyl methyl cellulose ether.

6. A lightweight, high-strength repair mortar, characterized in that, The lightweight, high-strength repair mortar includes: Water and the raw materials of the lightweight, high-strength repair mortar according to any one of claims 1 to 5. The water accounts for 10-30% of the total mass of the lightweight high-strength repair mortar.

7. The lightweight, high-strength repair mortar according to claim 6, characterized in that, The density of the repair mortar is 1400 kg / m³. 3 ~1800 kg / m 3 , The compressive strength is 20 MPa to 60 MPa.

8. The application of a lightweight, high-strength repair mortar as described in any one of claims 6 to 7 in the repair of building construction surfaces.

9. The application according to claim 8, characterized in that, The construction surface of the building includes the ground surface, vertical surface, and overhead surface.

10. The application according to claim 9, characterized in that, When performing repair work on the roof, the thickness of each application of the lightweight high-strength repair mortar is 10mm to 20mm.