Early-strength high-stability road grouting repair material and preparation thereof

Abstract

This invention discloses an early-strength, high-stability road grouting repair material and its preparation, belonging to the field of solid waste utilization and road grouting reinforcement technology. The raw materials of the early-strength, high-stability road grouting repair material of this invention include multi-source solid waste aggregates and a water-reducing agent; the multi-source solid waste aggregates, by mass percentage, include: 6.6 wt% fly ash, 5-15 wt% rapid-hardening sulfoaluminate cement, 64-74 wt% mineral powder, 13.4 wt% desulfurized gypsum, and 1% carbide slag. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically forming a slurry composite system with rapid-hardening sulfoaluminate cement and a water-reducing agent, and precisely controls the concentration of raw materials. During hydration, this system can generate supporting crystals, which not only provide high early-stage stone strength for the road grouting material, but also, due to its good stability, ensure high stone strength stability in the later stages.

Description

Technical Field

[0001] This invention relates to the fields of solid waste utilization and road grouting reinforcement technology, and in particular to a road grouting repair material with early strength and high stability and its preparation. Background Technology

[0002] Grouting is an engineering technique that uses grouting equipment to inject a solidifiable grout into unfavorable strata or pores through filling, penetration, compaction, or fracturing methods, thereby reinforcing the strata and achieving goals such as water stoppage and seepage prevention. Grouting materials, as the core component of this technology, directly determine the quality of grouting reinforcement and the ease of project implementation. Ideally, high-quality grouting materials should possess a series of excellent properties, including high fluidity to ensure smooth injection into the target area, rapid setting to shorten the construction cycle, high setting strength to provide reliable reinforcement effects, and strong durability to withstand long-term environmental impacts. They should also be characterized by simple preparation processes, readily available raw materials, non-toxicity, harmlessness, non-polluting nature, and non-corrosiveness.

[0003] In related research fields, existing studies have shown that multi-source solid waste-based grouting cementitious materials can be prepared by co-proportioning solid wastes such as fly ash, slag, blast furnace slag, steel slag, desulfurization gypsum, and cement clinker. These materials have advantages such as short setting time, high early strength, and stable later strength. They can not only meet the performance requirements of some engineering applications, but also effectively solve the problem of solid waste storage such as fly ash, reduce the material preparation cost, and show broad application prospects.

[0004] However, existing multi-source solid waste-based grouting cementitious materials still exhibit shortcomings when applied to road grouting projects. For example, firstly, the compressive strength of the aggregate is relatively low, making it difficult to meet the stringent strength requirements of roads in actual use; secondly, the variety of raw materials is complex, which significantly increases the difficulty of continuous industrial production and hinders large-scale promotion and application; and thirdly, the grout fluidity is low, failing to meet the required flow performance standards for grouting materials, thus affecting the grouting effect and project quality, requiring further improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a road grouting repair material with early strength and high stability, and its preparation method, to solve the aforementioned problems in the background art. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically combining rapid-hardening sulfoaluminate cement and a water-reducing agent to form a slurry composite system, and precisely controls the concentration of raw material content. During the hydration process, this system can generate supporting crystals, which not only provide the road grouting material with high early-stage stone strength, but also, due to its good stability, ensure high stone strength stability in the later stages, thereby maximizing the satisfaction of actual road usage standards.

[0006] To achieve the above objectives, the present invention provides the following technical solution: One of the technical solutions of this invention is to provide a road grouting repair material with early strength and high stability, wherein the raw materials include multi-source solid waste aggregates and water-reducing agents; The raw materials of the multi-source solid waste aggregate, by mass percentage, include: Fly ash 6.6 wt%, rapid hardening sulfoaluminate cement 5-15 wt%, mineral powder 64-74 wt%, desulfurized gypsum 13.4 wt%, and carbide slag 1%.

[0007] Preferably, the raw materials of the multi-source solid waste aggregate, by mass percentage, are: Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 5 wt%, mineral powder 74 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 10 wt%, mineral powder 69 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 15 wt%, mineral powder 64 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%.

[0008] Preferably, the chemical composition of the fly ash is as follows: The composition consists of 48.71 wt% SiO2, 36.35 wt% Al2O3, 4.39 wt% Fe2O3, 4.35 wt% CaO, 1.70 wt% K2O, 1.28 wt% TiO2, 0.74 wt% MgO, and the balance being impurities.

[0009] Preferably, the chemical composition of the mineral powder is as follows: CaO 44.62wt%, SiO2 22.75wt%, Al2O3 13.09wt%, MgO 7.21wt%, Fe2O3 4.68wt%, SO3 2.77wt%, TiO2 1.20wt%, K2O 0.38wt%, Na2O 0.57wt%, and the balance being impurities.

[0010] Preferably, the chemical composition of the desulfurized gypsum is as follows: SO3 51.82wt%, CaO 45.65wt%, SiO2 0.59wt%, Al2O3 0.46wt%, Fe2O3 0.17wt%, MgO 0.65wt%, Na2O 0.05wt%, and the balance being impurities.

[0011] Preferably, the chemical composition of the carbide slag is as follows: CaO 94.0wt%, SiO2 2.82wt%, Al2O3 1.04wt%, Fe2O3 1.00wt%, SO3 0.53wt%, Na2O 0.19wt%, and the balance being impurities.

[0012] Preferably, the water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent; the amount of water-reducing agent added is 0.1-0.2 wt% of the multi-source solid waste aggregate.

[0013] The second technical solution of the present invention provides a method for preparing the above-mentioned early-strength and high-stability road grouting repair material, comprising the following steps: The raw materials are mixed in a dry state to obtain a mixture; Water is added to the mixture to prepare a slurry.

[0014] Preferably, the water-cement ratio of the slurry is 0.4-0.44.

[0015] The third technical solution of the present invention provides an application of the above-mentioned early-strength and high-stability road grouting repair material in road engineering projects.

[0016] The beneficial technical effects of the present invention are as follows: This invention designs a high-strength, high-stability road grouting repair material. It constructs a quaternary solid waste system of fly ash, desulfurized gypsum, mineral powder, and carbide slag, which, in conjunction with rapid-hardening sulfoaluminate cement and a water-reducing agent, forms a slurry composite system with precisely controlled raw material concentrations. During hydration, this system generates supporting crystals. These crystals not only provide high early-stage stone strength for the road grouting material but also, due to their excellent stability, ensure high stone strength stability in later stages, thus maximizing the fulfillment of actual road usage standards.

[0017] Meanwhile, the interaction between the crystal particles and the water-reducing agent effectively improves the fluidity of the road grouting material and delays its setting time. This gives the grouting repair material both good fluidity and a moderate setting time, significantly improving its performance in practical engineering applications. Furthermore, by using solid wastes such as fly ash, mineral powder, desulfurized gypsum, and carbide slag, this grouting repair material not only effectively solves the problem of solid waste storage but also significantly reduces production costs, achieving the goals of simple, safe, environmentally friendly, and low-cost preparation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The image shows the XRD diffraction pattern of the hydration products of the early-strength and high-stability road grouting repair material of Experiment 10 of this invention.

[0020] Figure 2 This is a SEM image of the hydration products of the early-strength and high-stability road grouting repair material of Experiment 10 of the present invention. Detailed Implementation

[0021] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.

[0022] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0023] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. It should be noted that any aspects of this invention not described in detail are conventional practices in the art and are not the focus of this invention.

[0024] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.

[0025] In a first aspect, the present invention discloses a road grouting repair material with early strength and high stability, the raw materials of which include multi-source solid waste aggregates and water-reducing agents; The raw materials of the multi-source solid waste aggregate, by mass percentage, include: Fly ash 6.6 wt%, rapid hardening sulfoaluminate cement 5-15 wt%, mineral powder 64-74 wt%, desulfurized gypsum 13.4 wt%, and carbide slag 1%.

[0026] Furthermore, the amount of water-reducing agent added is 0.1-0.2 wt% of the multi-source solid waste aggregate, preferably 0.15 wt%, 0.2 wt%, or any value within the range mentioned above.

[0027] This invention constructs a quaternary solid waste system consisting of fly ash, desulfurized gypsum, mineral powder, and carbide slag, which, in conjunction with rapid-hardening sulfoaluminate cement and a water-reducing agent, forms a slurry composite system, with precise control over the concentration of raw materials. From a materials performance perspective, during the hydration process, this system generates supporting crystals. These crystals not only impart high early-stage strength to the road grouting material but also, due to their excellent stability, provide high stability in later-stage strength, thereby maximizing the fulfillment of actual road usage standards.

[0028] From a construction performance perspective, the crystal particles can also interact with the water-reducing agent. This interaction can effectively improve the fluidity of the road grouting material and delay its setting time, so that the grouting repair material has suitable fluidity and moderate setting time, thereby significantly improving its application performance in actual engineering.

[0029] From an environmental and economic perspective, this grouting repair material, by using a solid waste system composed of fly ash, mineral powder, desulfurized gypsum and carbide slag, not only effectively solves the problem of solid waste storage, but also significantly reduces production costs, fully achieving the goals of simple preparation process, safety and environmental protection, and low cost.

[0030] Furthermore, the raw materials of the multi-source solid waste aggregate, by mass percentage, are: Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 5 wt%, mineral powder 74 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 10 wt%, mineral powder 69 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 15 wt%, mineral powder 64 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%.

[0031] Of course, in addition to the examples mentioned above, the raw material content of the multi-source solid waste aggregate may also include any combination of the selected raw materials within the range of options, which will not be described one by one in this specification; at the same time, all contents mentioned in this specification are expressed as mass percentages.

[0032] It should be noted that in this invention, rapid-hardening sulfoaluminate cement is mainly used as a proppant for the early compressive strength of stones. This cement can be any commercially available rapid-hardening sulfoaluminate cement with any chemical composition; the embodiments of this invention do not have any special limitations in this regard. For example, in the embodiments of this invention, the rapid-hardening sulfoaluminate cement used was purchased from Shandong Zibo Yunhe Cement Co., Ltd., and its microstructure is characterized by loose small particles; its specific chemical composition is shown in Table 1.

[0033] Table 1: Chemical composition of rapid-hardening sulfoaluminate cement (mass fraction, %) In the example implementation, the fly ash is Bayer process fly ash from Guangxi (purchased from Guangxi Branch of Aluminum Corporation of China Limited), and its microstructure is characterized by loosely packed particles. The specific chemical composition is shown in Table 2.

[0034] Table 2: Chemical composition of fly ash (mass fraction, %) In the example implementation, the mineral powder was purchased from Guangxi Yuansheng Slag Comprehensive Utilization Co., Ltd., and its microstructure consists of uniformly distributed fine particles. The specific chemical composition is shown in Table 3.

[0035] Table 3: Chemical composition of mineral powder (mass fraction, %) In the example implementation, the desulfurized gypsum was purchased from Guangxi Zhechuang Chemical Co., Ltd., and its microstructure consists of layered, mutually aggregated small particles. The specific chemical composition is shown in Table 4.

[0036] Table 4: Chemical composition of desulfurized gypsum (mass fraction, %) Table 5: Chemical composition of carbide slag (mass fraction, %) This invention utilizes the synergistic effect of a solid waste system composed of fly ash, mineral powder, desulfurized gypsum, and carbide slag to generate a supporting crystalline framework composite during the hydration reaction. The formation of this crystalline framework composite imparts high early-stage aggregate strength to the road grouting material. Simultaneously, the good structural stability of the generated crystalline framework composite effectively solves the problem of aggregate volume expansion, thus ensuring high later-stage aggregate strength and stability of the road grouting material, maximizing its compliance with actual road strength standards. Furthermore, the particle characteristics of the selected fly ash, mineral powder, and desulfurized gypsum allow for good adsorption of water-reducing agents on the composite surface, increasing the fluidity of the prepared road grouting material while effectively delaying its setting time, thereby meeting the construction requirements of road repair materials.

[0037] Furthermore, the water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent, preferably a polycarboxylate water-reducing agent.

[0038] In this embodiment of the invention, the addition of polycarboxylate superplasticizer can improve the flowability of the raw material particles by changing the electrostatic force on the surface of the particles, without significantly affecting the original properties of the multi-source solid waste aggregate.

[0039] The early-strength and high-stability road grouting repair material prepared by this invention can achieve the following performance parameters: (1) The flow rate of the flow cone is 14.3-17.0 s; (2) Stone compressive strength ≥5.00Mpa after 1 day, stone compressive strength ≥20.00Mpa after 3 days, and stone compressive strength ≥30.00Mpa after 28 days.

[0040] Secondly, the present invention also discloses a method for preparing the above-mentioned multi-solid waste road grouting material, comprising the following steps: The raw materials are mixed in a dry state to obtain a mixture; Water is added to the mixture to prepare a slurry.

[0041] Furthermore, the water-cement ratio of the slurry is 0.4-0.44, preferably 0.4, 0.41, 0.42, 0.43, 0.44 or any value within the range mentioned above.

[0042] In this embodiment of the invention, by controlling the water-cement ratio, the road grouting material can be well compatible with the original road surface, which is conducive to better performing the filling and consolidation functions.

[0043] Thirdly, the present invention also discloses the application of the above-mentioned multi-solid waste road grouting material in road engineering projects.

[0044] Furthermore, the road-related works include, but are not limited to, grouting construction of the road base or subgrade.

[0045] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0046] All raw materials used in the following embodiments and comparative examples of the present invention are commercially available products.

[0047] Example 1 A road grouting repair material with early strength and high stability is prepared by using multi-source solid waste aggregates and water-reducing agents as raw materials; the amount of polycarboxylate water-reducing agent added is 0.15 wt% of the multi-source solid waste aggregates; The raw materials for multi-source solid waste aggregates, by mass fraction, are: 6.6 parts by weight of fly ash, 5 parts by weight of rapid-hardening sulfoaluminate cement, 74 parts by weight of mineral powder, 13.4 parts by weight of desulfurized gypsum, and 1 part by weight of carbide slag.

[0048] Early-strength and high-stability road grouting repair material is prepared according to the following steps: After mixing the above-mentioned fly ash, rapid-hardening sulfoaluminate cement, mineral powder, desulfurized gypsum, carbide slag and polycarboxylate superplasticizer in a dry state, add them together with water into a cement paste mixer at a water-cement ratio of 0.4. First, mix slowly for 120 seconds, stop for 15 seconds, and then mix rapidly for 120 seconds to obtain the final product.

[0049] Example 2 A road grouting repair material with early strength and high stability is prepared by using multi-source solid waste aggregates and water-reducing agents as raw materials; the amount of polycarboxylate water-reducing agent added is 0.15 wt% of the multi-source solid waste aggregates; The raw materials for multi-source solid waste aggregates, by mass fraction, are: 6.6 parts by weight of fly ash, 10 parts by weight of rapid-hardening sulfoaluminate cement, 69 parts by weight of mineral powder, 13.4 parts by weight of desulfurized gypsum, and 1 part by weight of carbide slag.

[0050] Early-strength and high-stability road grouting repair material is prepared according to the following steps: After mixing the above-mentioned fly ash, rapid-hardening sulfoaluminate cement, mineral powder, desulfurized gypsum, carbide slag and polycarboxylate superplasticizer in a dry state, add them together with water into a cement paste mixer at a water-cement ratio of 0.4. First, mix slowly for 120 seconds, stop for 15 seconds, and then mix rapidly for 120 seconds to obtain the final product.

[0051] Example 3 A road grouting repair material with early strength and high stability is prepared by using multi-source solid waste aggregates and water-reducing agents as raw materials; the amount of polycarboxylate water-reducing agent added is 0.15 wt% of the multi-source solid waste aggregates; The raw materials for multi-source solid waste aggregates, by mass fraction, are: 6.6 parts by weight of fly ash, 15 parts by weight of rapid-hardening sulfoaluminate cement, 64 parts by weight of mineral powder, 13.4 parts by weight of desulfurized gypsum, and 1 part by weight of carbide slag.

[0052] Early-strength and high-stability road grouting repair material is prepared according to the following steps: After mixing the above-mentioned fly ash, rapid-hardening sulfoaluminate cement, mineral powder, desulfurized gypsum, carbide slag and polycarboxylate superplasticizer in a dry state, add them together with water into a cement paste mixer at a water-cement ratio of 0.4. First, mix slowly for 120 seconds, stop for 15 seconds, and then mix rapidly for 120 seconds to obtain the final product.

[0053] Example 4 A road grouting repair material with early strength and high stability is prepared by using multi-source solid waste aggregates and water-reducing agents as raw materials; the amount of polycarboxylate water-reducing agent added is 0.20 wt% of the multi-source solid waste aggregates; The raw materials for multi-source solid waste aggregates, by mass fraction, are: 6.6 parts by weight of fly ash, 10 parts by weight of rapid-hardening sulfoaluminate cement, 69 parts by weight of mineral powder, 13.4 parts by weight of desulfurized gypsum, and 1 part by weight of carbide slag.

[0054] Early-strength and high-stability road grouting repair material is prepared according to the following steps: After mixing the above-mentioned fly ash, rapid-hardening sulfoaluminate cement, mineral powder, desulfurized gypsum, carbide slag and polycarboxylate superplasticizer in a dry state, add them together with water into a cement paste mixer at a water-cement ratio of 0.4. First, mix slowly for 120 seconds, stop for 15 seconds, and then mix rapidly for 120 seconds to obtain the final product.

[0055] Effect verification 1.1 To clarify the actual performance of the early-strength and high-stability road grouting repair material of the present invention, the early-strength and high-stability road grouting repair materials prepared in each embodiment were tested for stone compressive strength, setting time, flow cone fluidity, bleeding rate and expansion rate in accordance with GB / T17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The test results are shown in Table 6.

[0056] Table 6: Performance Test Results of Early-Strength and High-Stability Road Grouting Repair Materials 1.2 To explore the synergistic effect among the raw materials contained in the multi-source solid waste aggregate, the raw material composition and ratio of the multi-source solid waste aggregate were studied through single-factor experiments (the specific preparation steps are the same as in Example 1) using the stone compressive strength as the evaluation standard. The specific raw material ratio and test results are shown in Table 7.

[0057] Table 7: Raw material dismantling test of multi-source solid waste aggregates (mass percentage, wt%) According to the data in Table 7, in the fly ash-desulfurized gypsum-mineral powder ternary solid waste aggregate system, the compressive strength decreases with increasing proportions of fly ash and desulfurized gypsum. When the total proportion of fly ash and desulfurized gypsum is 10%, the 28-day compressive strength meets the requirements, and the early-stage (1-day and 3-day curing) compressive strength reaches its highest value. When calcium carbide slag is further added to this ternary solid waste aggregate system, the 1-day compressive strength significantly increases and reaches its maximum value during the same period. However, with the increase of calcium carbide slag addition, the early-stage compressive strength gradually decreases again. Therefore, the calcium carbide slag addition amount is determined to be 1%. After adding rapid-hardening sulfoaluminate cement, the compressive strength increases with increasing cement content; however, considering the cost-effectiveness of grouting materials, the appropriate addition amount of rapid-hardening sulfoaluminate cement is determined to be 10%. Based on the above reasons, the optimal quaternary solid waste aggregate formulation is the combination of fly ash, desulfurized gypsum, mineral powder, carbide slag, and rapid-hardening sulfoaluminate cement in a mass ratio of 6.6:13.4:69:1:10.

[0058] 1.2.1 To elucidate the mechanism by which the quaternary solid waste aggregate of this invention enhances compressive strength, phase distribution data of the hydration products (curing days 1, 3, and 28) of the early-strength, high-stability road grouting repair material from Experiment 10 are provided. The results are as follows: Figure 1 As shown.

[0059] Figure 1 The image shows the XRD diffraction pattern of the hydration products of the early-strength and high-stability road grouting repair material of Experiment 10 of this invention.

[0060] Depend on Figure 1 It can be seen that in the quaternary solid waste aggregate combination system of the present invention, as the curing age increases from 1 day to 28 days, the diffraction peak of desulfurized gypsum gradually disappears; this phenomenon indicates that the desulfurized gypsum gradually dissolves in the system and participates in the chemical reaction. Meanwhile, the diffraction peak intensity of ettringite remains at a high level from 1 day to 28 days, indicating that a large amount of ettringite is generated in the quaternary solid waste aggregate combination system. The diffraction peak of hematite does not show significant changes within the same curing age, meaning that hematite hardly participates in the chemical reaction within the system. Furthermore, the diffraction peak of calcite appears from 1 day to 28 days, indicating that a carbonation reaction occurs in the quaternary solid waste aggregate combination system, that is, carbon dioxide in the air reacts chemically with calcium hydroxide in the system to generate calcium carbonate. The above results demonstrate that the four solid waste raw materials in the quaternary solid waste aggregate combination system provided by the present invention can undergo chemical reactions after hydration to generate relatively stable compounds, which has a positive effect on improving the stability of the stone's compressive strength.

[0061] 1.2.2 This invention also provides microscopic morphology characterization images of the hydration products of the early-strength, high-stability road grouting repair material of Experiment 10, the results of which are as follows: Figure 2 As shown.

[0062] Figure 2 The images show SEM images of the hydration products of the early-strength and high-stability road grouting repair material of Experiment 10 of this invention. Among them, (a) represents curing for 1 day, (b) represents curing for 3 days, and (c) represents curing for 28 days.

[0063] according to Figure 2 It can be seen that after 1, 3, and 28 days of hydration of the quaternary solid waste aggregate, the hydration products are mainly long tubular AFt (ettringite) and honeycomb CSH (hydrated calcium silicate). A large amount of ettringite is generated as early as 1 day of hydration, hydrated calcium silicate appears at 3 days, and a large amount of ettringite is still found along with hydrated calcium silicate at 28 days of hydration. This indicates that the hydration products are mainly ettringite crystals during the period from 1 to 28 days, and the skeletal support of ettringite crystals plays an important role in early strength development.

[0064] 1.3 To investigate the effects of water-reducing agents on the rheological properties and performance of road grouting materials, the following single-factor experiments were conducted using fluidity and setting time as evaluation criteria and aggregate compressive strength as control criteria to optimize the dosage of water-reducing agents. Specific experimental results are shown in Table 8. In the experiments, the raw material formulation from Experiment 10 in Table 7 was selected for the multi-source solid waste aggregates, and polycarboxylate water-reducing agents were chosen.

[0065] Table 8: Experimental Study on Water-Reducing Agent Content (Percentage of Water-Reducing Agent in Multi-Source Solid Waste Aggregate, wt%) As shown in Table 8, when the water-reducing agent content is 0.1-0.2 wt%, all technical indicators meet the requirements for road grouting materials. When the water-reducing agent content is 0.25 wt%, although the taper flowability and compressive strength also meet the requirements, the final setting time is lower than the required requirements. This indicates that the addition of water-reducing agent can effectively improve the rheological properties of the prepared road grouting material, but it will have a negative impact on the setting time. Therefore, the preferred water-reducing agent content is 0.1-0.2 wt% of the total mass of multi-source solid waste aggregates.

[0066] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A road grouting repair material with early strength and high stability, characterized in that, The raw materials include multi-source solid waste aggregates and water-reducing agents; The raw materials of the multi-source solid waste aggregate, by mass percentage, include: Fly ash 6.6 wt%, rapid hardening sulfoaluminate cement 5-15 wt%, mineral powder 64-74 wt%, desulfurized gypsum 13.4 wt%, and carbide slag 1%.

2. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The raw materials of the multi-source solid waste aggregate, by mass percentage, are: Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 5 wt%, mineral powder 74 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 10 wt%, mineral powder 69 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%; or Fly ash 6.6 wt%, rapid-hardening sulfoaluminate cement 15 wt%, mineral powder 64 wt%, desulfurized gypsum 13.4 wt%, carbide slag 1%.

3. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The chemical composition of the fly ash is as follows: The composition consists of 48.71 wt% SiO2, 36.35 wt% Al2O3, 4.39 wt% Fe2O3, 4.35 wt% CaO, 1.70 wt% K2O, 1.28 wt% TiO2, 0.74 wt% MgO, and the balance being impurities.

4. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The chemical composition of the mineral powder is as follows: CaO 44.62wt%, SiO2 22.75wt%, Al2O3 13.09wt%, MgO 7.21wt%, Fe2O3 4.68wt%, SO3 2.77wt%, TiO2 1.20wt%, K2O 0.38wt%, Na2O 0.57wt%, and the balance being impurities.

5. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The chemical composition of the desulfurized gypsum is as follows: SO3 51.82wt%, CaO 45.65wt%, SiO2 0.59wt%, Al2O3 0.46wt%, Fe2O3 0.17wt%, MgO 0.65wt%, Na2O 0.05wt%, and the balance being impurities.

6. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The chemical composition of the carbide slag is as follows: CaO 94.0wt%, SiO2 2.82wt%, Al2O3 1.04wt%, Fe2O3 1.00wt%, SO3 0.53wt%, Na2O 0.19wt%, and the balance being impurities.

7. The early-strength, high-stability road grouting repair material according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent or a naphthalene-based water-reducing agent; the amount of water-reducing agent added is 0.1-0.2 wt% of the multi-source solid waste aggregate.

8. A method for preparing a road grouting repair material with early strength and high stability according to any one of claims 1-7, characterized in that, Includes the following steps: The raw materials are mixed in a dry state to obtain a mixture; Water is added to the mixture to prepare a slurry.

9. The preparation method according to claim 8, characterized in that, The water-cement ratio of the slurry is 0.4-0.

44.

10. The application of the early-strength and high-stability road grouting repair material according to any one of claims 1-7 in road engineering projects.

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