A geopolymer-based rapid repair mortar, concrete and its preparation method

Abstract

This invention relates to the field of building materials technology, specifically to a geopolymer-based rapid repair mortar, concrete, and its preparation method. The geopolymer-based rapid repair mortar provided by this invention is prepared by mixing fly ash and slag powder with specific particle size ranges as powder materials, along with fine aggregates, activators, water-reducing agents, defoamers, adhesive powder, and a water-retaining agent compounded from different compounds. This geopolymer-based repair mortar not only possesses rapid setting and hardening, high early strength, and excellent durability, but also exhibits low shrinkage, high bond strength, high flexural strength, and high compressive strength. This improves upon the shortcomings of ordinary geopolymer-based repair mortars, such as easy shrinkage, cracking, and detachment, and can be used for the rapid repair of damage such as cracking, slab breakage, detachment, and sandblasting in buildings including highways, airport runways, and bridges.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a geopolymer-based rapid repair mortar, concrete, and its preparation method. Background Technology

[0002] Concrete is currently the most widely used building material, but during its use, it often suffers damage or cracking due to various reasons, affecting its performance. To ensure the continued usability of concrete and minimize its lifespan, repair materials are needed. To guarantee that the repaired concrete retains its performance and achieves satisfactory results, the repair materials must possess high mechanical strength, good durability, and strong adhesion to the main concrete material. Furthermore, in situations such as highways, airport runways, or parking lots where concrete repair is required, time constraints necessitate repair materials with rapid setting speed and high early strength.

[0003] Geopolymers are three-dimensional network inorganic gel structures composed of silicon-oxygen tetrahedra and aluminum-oxygen tetrahedra. They possess advantages such as rapid setting and hardening, high early strength, excellent durability, and resistance to acid and alkali corrosion, making them a viable rapid repair material for concrete. However, in addition to these advantages, geopolymers also have drawbacks such as high shrinkage, high brittleness, easy cracking, and low bond strength. When used as a rapid repair material for concrete, they are prone to detachment and surface cracking. Although methods to reduce geopolymer cracking exist, adding water-retaining agents is still insufficient to prevent mortar cracking in the strongly alkaline environment provided by activators. Therefore, existing geopolymers cannot simultaneously meet the requirements of rapid setting and hardening, high early strength, low shrinkage, low brittleness, and high bond strength. Summary of the Invention

[0004] In view of this, the present invention provides a geopolymer-based rapid repair mortar and concrete and a method for preparing the same. The geopolymer-based rapid repair mortar and concrete have the characteristics of rapid setting and hardening, high early strength and excellent durability, as well as low shrinkage, high bond strength, high flexural strength and high compressive strength. It solves the problems of easy shrinkage, cracking, detachment and brittleness of existing geopolymer rapid repair materials, and its preparation method is simple and easy to implement.

[0005] To solve the above technical problems, the present invention provides a geopolymer-based rapid repair mortar, the raw materials of which include:

[0006] The ingredients include 20wt%–30wt% powder, 50wt%–60wt% fine aggregate, 18wt%–22wt% activator, water-retaining agent, water-reducing agent, defoamer, and adhesive powder.

[0007] The powder material includes fly ash with a particle size of less than 45 μm and a specific surface area of ​​more than 600 m². 2 / kg of slag powder; the amount of water-retaining agent added is 2% to 4% of the mass of the powder; the water-retaining agent includes cellulose compounds, polyacrylamide compounds and calcium stearate, the cellulose compounds include at least one of hydroxypropyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, and the polyacrylamide compounds include at least one of anionic polyacrylamide and nonionic polyacrylamide.

[0008] The geopolymer-based rapid repair mortar provided by this invention uses fine aggregate and powder with a specific particle size range as the main raw materials, and is combined with activators, specific types of water-retaining agents, water-reducing agents, defoamers and adhesive powder. It has low shrinkage, high bonding strength, high flexural strength and high compressive strength.

[0009] First, fly ash with a particle size of less than 45 μm and a specific surface area greater than 600 m² 2 The higher activity of fly ash and slag powder (per kg) results in greater adaptability to activators, enabling rapid setting and hardening even with a wider range of formulations. Simultaneously, the higher activity of fly ash and slag powder increases the reaction rate and shortens the reaction time, also improving the early strength of the mortar. The particle size and specific surface area of ​​the aforementioned fly ash and slag powder can be obtained by ball milling.

[0010] Secondly, this invention obtains a water-retaining agent by compounding at least three different compounds. By utilizing the different mechanisms of action and the different timing of action of different materials in the geopolymer reaction process, the geopolymer can not only achieve water retention in the strongly alkaline environment with a large amount of exothermic reaction in the early stage of the reaction, but also enable the repair mortar to maintain effective water retention for a long time after setting. This reduces the rate of water loss during the geopolymer reaction stage and the setting stage of the repair mortar, and avoids the phenomenon of cracking or falling off of the repair mortar caused by the large shrinkage of the repair mortar due to the rapid evaporation of a large amount of water.

[0011] In conjunction with the first aspect, the amount of water-reducing agent added is 0.5% to 1% of the mass of the powder material.

[0012] In conjunction with the first aspect, the amount of defoamer added is 0.1% to 0.3% of the mass of the powder material.

[0013] In conjunction with the first aspect, the amount of adhesive powder added is 5% to 8% of the mass of the powder material.

[0014] The addition of the above-mentioned water-reducing agent, defoamer, and adhesive powder can make the overall performance of the obtained geopolymer-based rapid repair mortar even better.

[0015] In conjunction with the first aspect, in the powder material, the mass percentage of fly ash is 60% to 80%, and the mass percentage of slag powder is 20% to 40%. Both fly ash and slag powder belong to industrial solid waste. This invention uses fly ash and slag powder as raw materials for powder materials, realizing the resource utilization of industrial solid waste.

[0016] In conjunction with the first aspect, the water-retaining agent contains 20% to 30% by mass of the cellulose compound.

[0017] In conjunction with the first aspect, the mass percentage of the polyacrylamide compound in the water-retaining agent is 40% to 60%.

[0018] In conjunction with the first aspect, the calcium stearate accounts for 20% to 30% of the mass of the water-retaining agent.

[0019] The water-retaining agent formulated according to the above ratio has a better effect, which can make the resulting polymer-based rapid repair mortar have a lower shrinkage rate, thus making it less prone to cracking.

[0020] In conjunction with the first aspect, the viscosity of the cellulose compound is 40,000 to 100,000.

[0021] In conjunction with the first aspect, the number-average molecular weight of the polyacrylamide compounds is 4 million to 6 million.

[0022] Choosing cellulose compounds with appropriate viscosity and polyacrylamide compounds with appropriate molecular weight can ensure that the viscosity is moderate during the mortar preparation process, thus making it easier to mix evenly.

[0023] In conjunction with the first aspect, the fine aggregate includes at least one of quartz sand, dried river sand, or tailings sand.

[0024] In conjunction with the first aspect, the fine aggregate is continuously graded sand with a particle size of 0.075–4.75 mm. Using continuously graded sand within this range as fine aggregate enables the resulting polymer-based rapid repair mortar to exhibit higher compressive and flexural strength after solidification.

[0025] In conjunction with the first aspect, the activator comprises 65%–85% water glass and 15%–35% sodium hydroxide solution by mass; wherein the water glass has a modulus of 2.0–2.2 and a Baume degree of 40; and the sodium hydroxide solution has a concentration of 6–7 mol / L. An activator with this composition and proportion can give the geopolymer-based rapid repair mortar better crack resistance and higher strength properties.

[0026] In conjunction with the first aspect, the water-reducing agent is a naphthalene-based water-reducing agent or a powdered polycarboxylate water-reducing agent.

[0027] In conjunction with the first aspect, the defoamer is at least one of alumina or aluminum silicate.

[0028] In conjunction with the first aspect, the adhesive powder is VAE redispersible latex powder.

[0029] The water-reducing agent, defoamer, and adhesive powder selected in this invention can still play their roles well in this alkaline mortar system, so that the resulting geopolymer-based rapid repair mortar has high bonding strength and low shrinkage rate.

[0030] A second aspect of the present invention provides a method for preparing a geopolymer-based rapid repair mortar, comprising the following steps:

[0031] Mix the powder, water-retaining agent, water-reducing agent, defoamer and adhesive powder and stir evenly. Add the fine aggregate and stir evenly. Then add the activator and stir evenly. Let stand for 4-6 minutes to obtain the polymer-based concrete rapid repair mortar.

[0032] The method for preparing geopolymer-based rapid repair mortar provided by this invention involves first mixing and stirring powdered materials, water-retaining agents, water-reducing agents, defoamers, and adhesive powder evenly before adding fine aggregates. This avoids the problem of insufficient mixing of the relatively small amounts of water-retaining agents, water-reducing agents, defoamers, and adhesive powders due to the presence of a large amount of fine aggregates. After adding an activator and stirring evenly, the mixture is allowed to stand for a period of time, allowing air bubbles generated during stirring to escape and preventing them from affecting the mortar's performance. This preparation method is simple, requires readily available conventional equipment, and is easy to scale up for production.

[0033] A third aspect of the present invention provides a geopolymer-based rapid repair concrete, comprising the aforementioned geopolymer-based rapid repair mortar, graded sand and gravel aggregate with a particle size of 5-20 mm, and a concrete activator; wherein the mass ratio of the sand and gravel aggregate to the powder material in the geopolymer-based rapid repair mortar is 2-2.5:1, the mass of the concrete activator is 20%-35% of the mass of the activator in the geopolymer-based rapid repair mortar, and the concrete activator has the same formulation as the activator in the geopolymer-based rapid repair mortar.

[0034] When the depth of the damaged area requiring repair is significant, using only polymer-based rapid repair mortar is insufficient to meet the repair requirements. Therefore, it is necessary to use graded sand and gravel aggregates with a particle size of 5–20 mm as a reinforcing component to blend with the repair mortar to prepare repair concrete, thereby meeting the concrete repair requirements. Because sand and gravel aggregates are added to the polymer-based rapid repair concrete, the amount of activator used also increases accordingly.

[0035] A fourth aspect of the present invention provides a method for preparing the above-mentioned polymer-based rapid repair concrete, specifically comprising: adding the concrete activator to the above-mentioned polymer-based rapid repair mortar, stirring evenly, then adding the sand and gravel aggregate, stirring evenly, and letting it stand for 2-3 minutes to obtain the polymer-based rapid repair concrete. This preparation method only requires adding the concrete activator and sand and gravel aggregate to the polymer-based rapid repair mortar sequentially, stirring evenly, and letting it stand for a period of time to allow internal air bubbles to escape, thereby obtaining the polymer-based rapid repair concrete.

[0036] The beneficial effects of this invention are as follows: The geopolymer-based rapid repair mortar provided by this invention uses fly ash and slag powder with a specific particle size range as powder materials, which are mixed with fine aggregates, activators, water-reducing agents, defoamers, adhesive powder, and water-retaining agents compounded from different compounds to prepare the mortar. It not only has rapid setting and hardening, high early strength, and excellent durability, but also low shrinkage, high bond strength, high flexural strength, and high compressive strength. It avoids the disadvantages of ordinary geopolymer-based repair mortars, such as easy shrinkage, cracking, and detachment. It can be used for the rapid repair of cracks, broken slabs, detachment, and sandblasting in buildings including highways, airport runways, and bridges. Furthermore, the preparation method of this geopolymer-based rapid repair mortar is simple and easy to scale up. The geopolymer-based rapid repair concrete provided by this invention can be used to repair concrete with a damage depth greater than 2 cm, and has the advantages of rapid setting and hardening, high early strength, low shrinkage, high flexural strength, and high compressive strength. No cracks appear 28 days after setting. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] In the following examples, the fly ash used contained 30.33% alumina by mass, 44.63% silica by mass, and had a particle size of less than 45 μm.

[0039] The slag powder contains 12.93% alumina and 37.65% silica by mass, and has a specific surface area greater than 600 m². 2 / kg.

[0040] Example 1

[0041] This embodiment provides a geopolymer-based rapid repair mortar, the raw material formula of which is shown in the table below:

[0042]

[0043] The preparation method is as follows:

[0044] S1. Mix the water glass and sodium hydroxide solution according to the formula, stir at 400 rpm for 10 min, cool, and obtain the activator;

[0045] S2. Add the powder material, water-retaining agent, water-reducing agent, defoamer and adhesive powder of the formula into the mixer and mix for 5 minutes. Add the fine aggregate of the formula and continue to mix until uniform. Then add the activator of the formula and mix at 400 rpm for 5 minutes. After that, let it stand for 5 minutes to obtain the polymer-based concrete rapid repair mortar.

[0046] Example 2

[0047] This embodiment provides a geopolymer-based rapid repair mortar, the raw material formula of which is shown in the table below:

[0048]

[0049] The preparation method is as follows:

[0050] S1. Mix the water glass and sodium hydroxide solution according to the formula, stir at 450 rpm for 8 minutes, cool, and obtain the activator;

[0051] S2. Add the powder material, water-retaining agent, water-reducing agent, defoamer and adhesive powder of the formula into the mixer and mix for 6 minutes. Add the fine aggregate of the formula and continue to mix until uniform. Then add the activator of the formula and mix at 450 rpm for 4 minutes. After that, let it stand for 4 minutes to obtain the polymer-based concrete rapid repair mortar.

[0052] Example 3

[0053] This embodiment provides a geopolymer-based rapid repair mortar, the raw material formula of which is shown in the table below:

[0054]

[0055] The preparation method is as follows:

[0056] S1. Mix the water glass and sodium hydroxide solution in the prescribed amounts evenly, cool, and obtain the activator;

[0057] S2. Add the powder material, water-retaining agent, water-reducing agent, defoamer and adhesive powder of the formula into the mixer and mix for 6 minutes. Add the fine aggregate of the formula and continue to mix until uniform. Then add the activator of the formula and mix at 350 rpm for 6 minutes. After that, let it stand for 6 minutes to obtain the polymer-based concrete rapid repair mortar.

[0058] Example 4

[0059] This embodiment provides a geopolymer-based rapid repair concrete, the raw material formula of which is shown in the table below:

[0060]

[0061]

[0062] The preparation method is as follows:

[0063] Geopolymer-based rapid repair mortar was prepared according to the preparation method in Example 1. The same amount of activator as in Example 1 was added, and the mixture was stirred at 400 rpm for 5 minutes. Then, the same amount of sand and gravel aggregate was added, and the mixture was stirred at the same speed for another 5 minutes. After standing for 3 minutes, the geopolymer-based rapid repair concrete was obtained.

[0064] Example 5

[0065] This embodiment provides a geopolymer-based rapid repair concrete, the raw material formula of which is shown in the table below:

[0066] raw material Number of parts by weight Geopolymer-based rapid repair mortar with the same formulation as in Example 2 394 Sand and gravel aggregate (particle size 5-20mm) 160 Concrete activator (same as the activator used in Example 2) 17

[0067] The preparation method is as follows:

[0068] Geopolymer-based rapid repair mortar was prepared according to the preparation method in Example 1. The same amount of activator as in Example 1 was added, and the mixture was stirred at 450 rpm for 4 minutes. Then, the same amount of sand and gravel aggregate was added, and the mixture was stirred at the same speed for another 4 minutes. After standing for 2 minutes, the geopolymer-based rapid repair concrete was obtained.

[0069] Example 6

[0070] This embodiment provides a geopolymer-based rapid repair concrete, the raw material formula of which is shown in the table below:

[0071] raw material Number of parts by weight Geopolymer-based rapid repair mortar with the same formulation as in Example 3 412.4 Sand and gravel aggregate (particle size 5-20mm) 265 Concrete activator (same as the activator used in Example 3) 21

[0072] The preparation method is as follows:

[0073] Geopolymer-based rapid repair mortar was prepared according to the preparation method in Example 1. The same amount of activator as in Example 1 was added, and the mixture was stirred at 350 rpm for 6 minutes. Then, the same amount of sand and gravel aggregate was added, and the mixture was stirred at the same speed for another 6 minutes. After standing for 3 minutes, the geopolymer-based rapid repair concrete was obtained.

[0074] Comparative Example 1

[0075] This comparative example provides a geopolymer-based repair mortar, whose raw material formulation is similar to that of Example 1, except that the fly ash used has a particle size greater than 45 μm and the slag powder has a specific surface area of ​​less than 600 m². 2 / kg, prepared using the same method as in Example 1.

[0076] Comparative Example 2

[0077] This comparative example provides a geopolymer-based repair mortar, whose raw material formula is similar to that of Example 2, except that no water-retaining agent is added to the raw materials, and the preparation method is the same as that in Example 2.

[0078] Comparative Example 3

[0079] This comparative example provides a geopolymer-based repair mortar, whose raw material formula is similar to that of Example 2, except that the water-retaining agent used is the same mass of hydroxypropyl cellulose, and the preparation method is the same as that in Example 2.

[0080] Comparative Example 4

[0081] This comparative example provides a geopolymer-based repair mortar, whose raw material formula is similar to that of Example 2, except that the water-retaining agent used is the same mass of phosphate starch, and the preparation method is the same as that in Example 2.

[0082] Comparative Example 5

[0083] This comparative example provides a geopolymer-based repair mortar, whose raw material formula is similar to that of Example 2, except that the adhesive powder used is the same mass of polyvinyl alcohol adhesive powder, and the preparation method is the same as that in Example 2.

[0084] Comparative Example 6

[0085] This comparative example provides a geopolymer-based repair mortar, whose raw material formula is similar to that of Example 2, except that the defoamer used is an equal mass of organosilicon defoamer, and the preparation method is the same as that in Example 2.

[0086] Example of effect

[0087] The geopolymer-based rapid repair mortars obtained in Examples 1-3 and Comparative Examples 1-6 were used to repair road surfaces with a damage depth of 0.5-1.5 cm. The geopolymer-based rapid repair concrete obtained in Examples 4-6 was used to repair road surfaces with a damage depth of 2.5-3.5 cm. The specific repair methods are as follows:

[0088] Clean the surface of the area to be repaired, moisten it with water but make sure there are no water droplets left, apply the polymer-based rapid repair mortar or polymer-based rapid repair concrete to the area to be repaired and smooth it. After the repair material has initially set, cover it with a membrane for curing. No watering is required during the curing process. Curing can be completed after 4 hours.

[0089] After the repair was completed, the setting time and mechanical properties of the repair material were tested, and the cracking at the repair site was observed. The results are shown in Table 1.

[0090] Table 1 compares the overall performance of road surface repair using various examples and comparative examples.

[0091]

[0092]

[0093]

[0094] Comparing the results of Example 1 and Comparative Example 1, it can be seen that when the particle size of the fly ash and slag powder used exceeds the particle size range provided by the present invention, the initial setting time and final setting time of the obtained repair mortar are significantly prolonged. At the same time, the early mechanical strength (including compressive strength, flexural strength and tensile bond strength) and the later mechanical strength are significantly reduced, indicating that the particle size of the fly ash and slag powder used is crucial to the setting time and mechanical strength of the repair material.

[0095] Comparing the results of Example 2 and Comparative Example 2, it can be seen that although the early mechanical strength of the repair mortar without water-retaining agent is higher than that of the repair mortar with water-retaining agent, the later mechanical strength is significantly lower than that of the repair mortar with water-retaining agent. The shrinkage rate is nearly 10 times that of the repair mortar with water-retaining agent, and cracking is obvious and even peeling occurs. This indicates that the addition of water-retaining agent can effectively prevent the cracking and peeling of the repair material.

[0096] Comparing the results of Example 2 and Comparative Example 3, it can be seen that when only hydroxypropyl cellulose is used as a water-retaining agent, the mechanical properties of Comparative Example 3 and Example 2 are comparable in the early stage of the reaction. However, the compressive strength of Comparative Example 3 on the 28th day is significantly lower than that of Example 2 at the same time, and the shrinkage is severe, with obvious cracking and peeling. This indicates that the water-retaining effect of hydroxypropyl cellulose is poor in the later stage of the reaction, which easily causes the repair mortar to dry shrink and crack.

[0097] Comparing the results of Example 2 and Comparative Example 4, it can be seen that when the water-retaining agent is replaced with phosphate starch, the setting time of Comparative Example 4 is significantly shorter than that of Example 2, and it shrinks severely, cracking and falling off on the 28th day. This indicates that the water-retaining effect of phosphate starch is poor in both the early and late stages of the reaction.

[0098] Comparing the results of Example 2 and Comparative Example 5, it can be seen that when VAE redispersible latex powder is replaced with polyvinyl alcohol powder, although the tensile bond strength of Comparative Example 5 is slightly higher than that of Example 2 in the early stage of the reaction, its tensile bond strength on day 28 is much lower than that of Example 2. Moreover, its compressive strength and flexural strength are both lower than the corresponding data of Example 2. This indicates that polyvinyl alcohol powder has a small effect on improving the mechanical properties of mortar in the later stage of the reaction, and the effect is poor.

[0099] Comparing the results of Example 2 and Comparative Example 6, it can be seen that when the inorganic defoamer is replaced with the organosilicon defoamer, the mechanical strength of Comparative Example 6 is lower than that of Example 2, both in the early and later stages. This indicates that the inorganic defoamer alumina is more beneficial in improving the mechanical strength of the mortar.

[0100] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A geopolymer-based rapid repair mortar, characterized in that, Raw materials include: Powder material 20wt%~30wt%, fine aggregate 50wt%~60wt%, activator 18wt%~22wt%, water-retaining agent, water-reducing agent, defoamer and adhesive powder; The powder material includes fly ash with a particle size of less than 45 μm and a specific surface area of ​​more than 600 m². 2 / kg of slag powder; the amount of water-retaining agent added is 2%~4% of the mass of the powder material; the water-retaining agent includes cellulose compounds, polyacrylamide compounds and calcium stearate, the cellulose compounds include at least one of hydroxypropyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, the polyacrylamide compounds include at least one of anionic polyacrylamide and nonionic polyacrylamide, the defoamer is at least one of alumina or aluminum silicate, and the adhesive powder is VAE redispersible latex powder.

2. The geopolymer-based rapid repair mortar as described in claim 1, characterized in that, The amount of water-reducing agent added is 0.5% to 1% of the mass of the powder material; and / or The amount of defoamer added is 0.1% to 0.3% of the mass of the powder; and / or The amount of adhesive powder added is 5% to 8% of the mass of the powder material.

3. The geopolymer-based rapid repair mortar as described in claim 1, characterized in that, The fly ash in the powder material accounts for 60% to 80% by mass, and the slag powder accounts for 20% to 40% by mass.

4. The geopolymer-based rapid repair mortar as described in claim 1, characterized in that, In the water-retaining agent, the cellulose compound accounts for 20% to 30% by mass; and / or In the water-retaining agent, the polyacrylamide compound accounts for 40% to 60% by mass; and / or In the water-retaining agent, the calcium stearate accounts for 20% to 30% by mass; and / or The viscosity of the cellulose compound is 40,000 to 100,000; and / or The number-average molecular weight of the polyacrylamide compounds is 4 to 6 million.

5. The geopolymer-based rapid repair mortar as described in claim 1 or 2, characterized in that, The fine aggregate includes at least one of quartz sand, dried river sand, or tailings sand; and / or The fine aggregate is continuously graded sand with a particle size of 0.075~4.75mm.

6. The geopolymer-based rapid repair mortar as described in claim 1 or 2, characterized in that, The activator comprises 65% to 85% water glass and 15% to 35% sodium hydroxide solution by mass. The water glass has a modulus of 2.0 to 2.2 and a Baumé degree of 40; the sodium hydroxide solution has a concentration of 6 to 7 mol / L.

7. The geopolymer-based rapid repair mortar as described in claim 1 or 2, characterized in that, The water-reducing agent is a naphthalene-based water-reducing agent or a powdered polycarboxylate water-reducing agent.

8. A method for preparing the geopolymer-based rapid repair mortar according to any one of claims 1 to 7, characterized in that, Prepare according to the following steps: Mix the powder, water-retaining agent, water-reducing agent, defoamer and adhesive powder evenly, add the fine aggregate and mix evenly, then add the activator and mix evenly. Let stand for 4-6 minutes to obtain the polymer-based concrete rapid repair mortar.

9. A geopolymer-based rapid repair concrete, characterized in that, Includes the geopolymer-based rapid repair mortar as described in any one of claims 1 to 7, graded sand and gravel aggregate with a particle size of 5 to 20 mm, and concrete activator; The mass ratio of the sand and gravel aggregate to the powder material in the polymer-based rapid repair mortar is 2~2.5:1, the mass of the concrete activator is 20%~35% of the mass of the activator in the polymer-based rapid repair mortar, and the concrete activator has the same formula as the activator in the polymer-based rapid repair mortar.

10. A method for preparing geopolymer-based rapid repair concrete as described in claim 9, characterized in that, Add the concrete activator to the geopolymer-based rapid repair mortar according to any one of claims 1 to 7, stir evenly, then add the sand and gravel aggregate, stir evenly, and let stand for 2 to 3 minutes to obtain the geopolymer-based rapid repair concrete.

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