Micro-nano suspension liquid for reinforcing earthen ruins based on Ca / Mg / Si gel system and preparation method of micro-nano suspension liquid

Abstract

The invention discloses a Ca / Mg / Si gel system-based micro-nano suspension for reinforcing earthen ruins and a preparation method thereof, and belongs to the technical field of building materials. The micro-nano suspension comprises the following components: calcium hydroxide, magnesium hydroxide, a siliceous volcanic ash material, a dispersing agent, a water reducing agent and water. According to the invention, a Ca / Mg / Si gelling system is constructed to form a bimodal distribution particle characteristic mainly comprising micro-nano particles, so that the particle stability and the storage timeliness of the suspension are remarkably improved. The suspension liquid generates nanoscale spherical hydrated magnesium silicate (M-S-H) gel through a hydration reaction, a permeation migration mechanism of'small-particle-size raw materials-nano products-spherical migration units' is established, deep permeation and diffusion in the earthen ruins are achieved, the surface hardness of the earthen ruins can be effectively improved, and the surface hardness of the earthen ruins is improved. And the capability of resisting a complex erosion environment is obviously enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and more specifically, relates to a micro-nano suspension for reinforcing earthen ruins based on a Ca / Mg / Si cementitious system and a preparation method thereof. Background Art

[0002] Under the dual influence of natural weathering and human activities, the surface of earthen ruins generally has the problem of continuous degradation. Long-term exposure to environmental factors such as wind and rain erosion, freeze-thaw cycles, etc. will damage the bonding force between soil particles, increase the particle spacing, and then lead to weathering phenomena such as surface peeling and pulverization. Therefore, how to effectively improve the weather resistance of the surface of earthen ruins has become the core challenge in the field of cultural heritage protection.

[0003] Chemical reinforcement technology, which combines chemical solutions or cementitious materials with soil particles, is an effective means of protecting weathered surfaces. Although organic materials (such as fluoropolymers, acrylic resins, etc.) have received attention due to their strong permeability and fast curing, their poor compatibility with the soil body and weak anti-aging performance result in limited protection time. For example, the evaluation of restoration cases of masonry cultural relics 20 - 30 years ago shows that the compatibility of new and old materials directly affects the long-term effectiveness of protection. In contrast, inorganic materials (especially traditional lime-based materials) have recently become a research hotspot because their composition and mechanical properties are close to those of the original soil body. Its reinforcement mechanism mainly relies on the carbonation reaction of Ca(OH)2, but there are defects such as insufficient penetration depth, easy precipitation of white salt crystals, and low overall reinforcement strength.

[0004] To improve the performance of lime-based materials, recent research has focused on regulating their hardening mechanism through raw material modification, among which the introduction of reactive silicon (Si) is particularly prominent. This technology is based on the pozzolanic reaction principle, using silica fume or nano-silica to react with Ca(OH)2 to generate C-S-H gel, thereby improving the mechanical strength and durability of the material. Based on this, hydraulic lime shows potential in the crack repair of masonry cultural relics. However, calcium silicate (CS)-based cementitious suspensions still face significant problems: low solubility, poor stability of particle distribution, which easily lead to problems such as insufficient penetration efficiency and insufficient cementation of the weathered layer. Summary of the Invention

[0005] The purpose of the present invention is to provide a micro-nano suspension for reinforcing earthen ruins based on a Ca / Mg / Si cementitious system and a preparation method thereof, so as to solve the problems existing in the above-mentioned prior art and achieve the preparation of a high-performance Ca / Mg / Si cementitious system.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] One of the technical solutions of the present invention: Provide a micro-nano suspension for reinforcing earthen ruins based on a Ca / Mg / Si cementitious system. By mass, the raw materials include the following components:

[0008] 5 - 6 parts of calcium hydroxide, 2 - 3 parts of magnesium hydroxide, 2 - 3 parts of siliceous volcanic ash material, 1.3 - 2 parts of dispersant, and 1000 - 1200 parts of water.

[0009] Preferably, the D90 particle size of the calcium hydroxide ≤ 15 μm; the particle size of the magnesium hydroxide is D90 particle size ≤ 8 μm.

[0010] Preferably, the siliceous volcanic ash material includes nano-silica and silica fume.

[0011] Preferably, the siliceous volcanic ash material, by mass, includes the following components: 0.5 - 0.8 parts of nano-silica and 1.5 - 2.5 parts of silica fume.

[0012] The functions of calcium hydroxide, magnesium hydroxide, and siliceous volcanic ash material in the present invention are as follows:

[0013] The function of calcium hydroxide is: (1) It undergoes an ion exchange reaction with potassium and sodium cations in the soil, thereby promoting soil aggregation, improving density and strength. (2) Calcium hydroxide reacts with reactive silica (SiO2) and aluminum oxide (Al2O3) in the soil to form cementitious substances such as calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H). These cementitious products fill the soil pores and form a network structure, significantly enhancing the integrity and compressive strength of the soil. (3) Calcium hydroxide reacts with carbon dioxide (CO2) in the air to form calcium carbonate (CaCO3) crystals, and the calcium carbonate crystallization further fills the pores, enhancing soil density and durability. The function of magnesium hydroxide is: (1) It has a spherical particle morphology, a small particle size, and the hydrated product M-S-H gel is small-sized spherical particles, which is beneficial for penetration in the soil; (2) The strength of the M-S-H gel is higher than that of the C-S-H gel, which can improve the reinforcement effect. The selected siliceous volcanic ash material has the characteristics of small particle size and spherical particle structure, and after mixing calcium hydroxide, magnesium hydroxide, and siliceous volcanic ash material with specific particle sizes, a continuous particle gradation can be formed (calcium hydroxide and magnesium hydroxide belong to the micron level, the particle size of nano-silica belongs to the nano level, and the particle size range of silica fume is between nano and micron), which is the key to ensuring the particle stability of the suspension and deep penetration in the soil.

[0014] Under the ratio of the main raw materials of calcium hydroxide, magnesium hydroxide, and siliceous volcanic ash material in the present invention, stronger compatibility in mechanical properties between the cementitious material and the weathered layer of the earthen ruins (with a strength of 0.1 - 2 MPa) can be achieved. On this basis, if the dosage of magnesium hydroxide is too large, the corrosion resistance will be damaged.

[0015] Preferably, the D90 particle size of the nano-silica is ≤80 nm; the D90 particle size of the silica fume is ≤5 μm.

[0016] The particle size and particle morphology of calcium hydroxide, magnesium hydroxide, and siliceous volcanic ash materials are the key factors affecting the particle stability of the suspension. The material combination used in the present invention forms a continuous gradation on the nano- to micron scale, and the particles are all spherical particles, which can increase the electrostatic repulsion and steric hindrance effects between particles and improve the particle stability of the suspension.

[0017] Preferably, the dispersant, by mass, comprises the following components: 1 - 1.5 parts of melamine and 0.3 - 0.5 parts of cellulose ether. Melamine, as a surfactant, can improve the particle wettability and initial dispersibility, while cellulose ether provides long-term steric hindrance and thickening stability.

[0018] Preferably, the micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system further comprises 0.6 - 1 part of water reducer.

[0019] Technical solution two of the present invention: Provide a preparation method of the micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system as described above, comprising the following steps:

[0020] Mix each component according to the specified dosage to obtain the micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system.

[0021] Further, the order of mixing each component includes: First, mix the dispersant, water reducer, and water, and then add calcium hydroxide, magnesium hydroxide, and siliceous volcanic ash materials thereto.

[0022] Technical solution three of the present invention: Provide an application of the micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system as described above in the reinforcement of the weathered layer on the surface of earthen heritage sites.

[0023] Technical solution four of the present invention: Provide a reinforcement method for earthen heritage sites, comprising the following steps: Reinforce the earthen heritage sites using the micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system as described above.

[0024] The present invention utilizes the micro-nano spherical particle characteristics of Mg(OH)2 and its hydrated product M-S-H gel, effectively overcoming the performance defects of traditional Ca / Si inorganic cementitious materials. Compared with the Ca / Si system, the Ca / Mg / Si system exhibits more excellent particle stability and storage timeliness, and shows more excellent permeability and diffusivity in porous matrices. This performance improvement is mainly due to the morphology regulation mechanism of "small particle size raw materials - nano products - spherical migration units". More importantly, the Ca / Mg / Si cementitious system composed of calcium hydroxide, magnesium hydroxide and siliceous volcanic ash materials can generate nano-scale spherical magnesium silicate hydrate (M-S-H) gel through hydration reaction, which has higher density and elastic modulus, thus significantly improving the reinforcement effect on the surface of weathered soil sites, including surface hardness, water erosion resistance, salt freeze-thaw cycle resistance, dry-wet cycle resistance, etc.

[0025] Specifically, the formation process of the morphology regulation mechanism of "small particle size raw materials - nano products - spherical migration units" is as follows: The formation of this morphology regulation mechanism begins with the selection of small particle size raw materials with continuous gradation. Calcium hydroxide, magnesium hydroxide, silica fume and nano-silica all have high crystallinity, smooth spherical surface and narrow particle size distribution, laying the foundation for the morphology of subsequent products. Compared with Ca(OH)2, the smaller initial particle size and uniform morphology of Mg(OH)2 make it easier to form nano-scale products during the reaction process.

[0026] In the reaction stage, the M-S-H gel formed by the reaction of Mg(OH)2 and silicate inherits the spherical characteristics of the raw materials, and the particle size is further reduced to form nano-products. SEM analysis (as Figure 6 shown) shows that the surface of M-S-H gel is smooth and the size is uniform. This morphological advantage makes it show excellent dispersibility in the suspension. The small particle size intensifies the Brownian motion, offsetting the gravitational sedimentation, while the high sphericity reduces the contact area between particles and reduces the tendency of aggregation. In addition, the coordination bonding of Mg 2+ with the surface hydroxyl groups (-OH) of silicate enhances the negative charge on the particle surface and strengthens the electrostatic repulsion, further improving the suspension stability.

[0027] Finally, the stable nano-scale spherical particles form migration units, whose size highly matches the multi-scale pores (nano-millimeter scale) of the weathered layer of the soil site. According to the pore size matching theory, small-sized and highly dispersed spherical particles are more likely to penetrate into deep micro-pores to achieve efficient reinforcement. Therefore, the CMS system optimizes the permeability and reinforcement effect of the suspension through the morphology regulation of "small particle size raw materials → nano products → spherical migration units", overcoming the penetration limitation of traditional inorganic materials in the protection of soil sites.

[0028] The present invention discloses the following technical effects:

[0029] (1) Through scientific research and practical tests, the present invention combines and utilizes the kinetic stability of the suspension with the bimodal particle size distribution characteristics and the deep penetration of the micro-nano spherical migration units, and successfully prepares a Ca / Mg / Si cementitious system that can be used for the surface reinforcement of earthen sites, which is expected to significantly improve the surface hardness and anti-scouring performance of earthen sites and enhance their ability to resist the erosion of complex environments.

[0030] (2) The raw material system selected in the present invention has the bimodal particle size distribution characteristics mainly composed of micro-nano particles, which can significantly improve the particle stability and storage timeliness of the suspension; the Ca / Mg / Si cementitious system can generate nano-scale spherical magnesium silicate hydrate (M-S-H) gel through hydration reaction, and then establish a penetration and migration mechanism of "small particle size raw materials - nano products - spherical migration units", which can promote the deep penetration of effective cementitious components in earthen sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The preparation flow chart of the micro-nano suspension for earthen site reinforcement based on the Ca / Mg / Si cementitious system of the present invention;

[0032] Figure 2 The particle size distribution diagrams of calcium hydroxide (a) and magnesium hydroxide (b) used in the present invention;

[0033] Figure 3 The particle size distribution diagram of the micro-nano suspension prepared in Example 1;

[0034] Figure 4 The test diagrams of the infiltration and diffusion tests of the suspensions obtained in Example 4 and Comparative Example 1;

[0035] Figure 5 The apparent photos of the suspensions obtained in Example 4 and Comparative Example 1 after the environmental degradation test;

[0036] Figure 6 The SEM diagram of the suspension obtained in Example 4;

[0037] Figure 7 The particle size distribution diagrams of silica fume (a) and nano-silica (b) used in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0038] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics, and implementation schemes of the present invention.

[0039] It should be understood that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the present invention. In addition, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0040] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0041] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the present invention specification, which are obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention are obvious to those skilled in the art. The specification and examples of the present invention are merely exemplary.

[0042] Regarding "comprising", "including", "having", "containing", etc. used herein, they are all open-ended terms, meaning including but not limited to.

[0043] It should be noted that the aspects not described in detail in the present invention are all conventional operating means in the art and are not the focus of the present invention.

[0044] The preparation flow chart of the micro-nano suspension for reinforcing earthen sites based on the Ca / Mg / Si cementitious system described in the present invention is as Figure 1 shown.

[0045] Unless otherwise specified, all raw materials used in the examples and comparative examples of the present invention are commercially available products, and the sources of the commercially available products do not affect the technical effects of the present invention.

[0046] Unless otherwise specified, the "parts" used in the examples and comparative examples of the present invention are all "parts by mass".

[0047] Unless otherwise specified, the room temperature involved in the present invention is calculated as 25 ± 5 °C.

[0048] The raw materials and properties used in the examples and comparative examples of the present invention are as follows:

[0049] Calcium hydroxide with an average particle size of 13.92 μm, magnesium hydroxide with an average particle size of 2.02 μm, and the particle size distributions of calcium hydroxide and magnesium hydroxide are as Figure 2 shown.

[0050] Siliceous pozzolanic materials: nano-silica with an average particle size of 45 nm, silica fume with an average particle size of 0.92 μm, and the particle size distributions of nano-silica and silica fume are as Figure 7 shown.

[0051] Dispersants: YH-22 anionic melamine (melamine), hydroxypropyl methyl cellulose (cellulose ether) with a viscosity of 50000 mPa·s.

[0052] Water-reducing agent: polycarboxylate water-reducing agent Point-TS8.

[0053] Water: tap water.

[0054] In the performance test of the present invention, the soil matrix is silty clay with a plasticity index of 10-17. Cubic specimens with dimensions of 5 cm × 5 cm × 2 cm are prepared and subjected to weathering treatment to make their density 1.9 g / cm 3 .

[0055] Examples 1-4

[0056] In Examples 1-4, the raw materials and dosages for preparing the micro-nano suspension for reinforcing earthen ruins based on the Ca / Mg / Si cementitious system are shown in Table 1.

[0057] Table 1 Mix ratio of the micro-nano suspension for reinforcing earthen ruins based on the Ca / Mg / Si cementitious system (by mass parts)

[0058]

[0059] The specific preparation processes of Examples 1-4 are as follows: Dissolve melamine, cellulose ether, and water-reducing agent in water to obtain a solvent; uniformly mix calcium hydroxide, magnesium hydroxide, and siliceous pozzolanic materials, and then add them to the solvent and disperse evenly by ultrasonic treatment for 30 min to obtain a micro-nano suspension.

[0060] Comparative Example 1

[0061] The difference from Example 4 is that an equal amount of calcium hydroxide is used to replace the magnesium hydroxide raw material, and the others are the same as in Example 4.

[0062] Comparative Example 2

[0063] The difference from Example 4 is that "magnesium hydroxide" is replaced with an equal amount of "aluminum hydroxide", and the others are the same as in Example 4.

[0064] Comparative Example 3

[0065] The difference from Example 4 is that the dosage of magnesium hydroxide is adjusted to 5 parts, and the others are the same as in Example 4.

[0066] Comparative Example 4

[0067] The difference from Example 4 is that the particle size of the selected calcium hydroxide is D90 = 26.5 μm, the particle size of magnesium hydroxide is D90 = 16.3 μm, the particle size of silica fume is D90 = 11.5 μm, and the particle size of nano-silica is D90 = 200 nm, and the others are the same as in Example 4.

[0068] Comparative Example 5

[0069] The difference from Example 4 is that the pozzolanic material used is 0.65 parts of metakaolin and 2.2 parts of slag, and the others are the same as in Example 4.

[0070] Perform performance tests on the suspensions prepared in the above examples and comparative examples. The test methods are as follows:

[0071] 1. Test for bleeding water of suspension: Immediately pour 100 mL of the suspensions prepared in the above examples and comparative examples into a graduated cylinder, and then seal it with a plastic template. Place these graduated cylinders on a horizontal platform and observe the layering phenomenon every 30 minutes. The separation interface between the supernatant and the lower-layer suspension is recorded as V t (mL), and the bleeding water volume V b (mL) of the suspension is obtained through Equation (1).

[0072] V b = 100 - V t (1)

[0073] 2. Infiltration and diffusion test: Utilize the principle that phenolphthalein changes color in the presence of alkali. Sprinkle the soil matrix with phenolphthalein solution in advance. Then, drop 5 g of the suspensions prepared in the above examples and comparative examples on the side (except the top and bottom) of the soil matrix, and observe the color change of these samples. When the purple area no longer spreads, measure the area and depth of the purple area.

[0074] 3. Surface color difference test: Use a precision colorimeter to measure the color parameters of the original and reinforced soil matrix, and calculate the total color difference between them according to the color coordinate system of the CIE 1976 (L*a*b) color space.

[0075] Table 2 Evaluation method for surface color difference values

[0076] Item Evaluation method + - Total color difference - ΔE <![CDATA[[(ΔL) 2 +(Δa) 2 +(Δb) 2 1 / 2 > ​ / / Luminance color difference - ΔL <![CDATA[L 样品 -L 标准 > Towards white Towards black Red / green color difference - Δa <![CDATA[a 样品 -a 标准 > Towards red Towards green Yellow / blue color difference - Δb <![CDATA[b 样品 -b 标准 > Towards yellow Towards blue

[0077] 4. Surface hardness test: Use a Shore hardness tester to test the surface hardness of the reinforced soil matrix.

[0078] 5. Environmental degradation test: First, seal the four sides of the soil matrix with PTFE tape, leaving only the top and bottom surfaces as the exposed surfaces. The test adopts a cyclic loading mode, and each complete cycle includes the following steps: (1) Immerse the bottom of the soil matrix in 0.5 mol / L Na2SO4 solution for 12 h, and then dry it naturally at room temperature; (2) Freeze the soil matrix in a low-temperature environment of -20 °C for 4 h, then thaw it at room temperature, and finally dry it in a constant-temperature environment of 55 °C for 4 h. This cyclic process aims to simulate the combined action of various degradation factors such as salt erosion, freeze-thaw cycle, and wet-dry alternation in the actual environment. Calculate the mass loss rate of the soil matrix after 4 complete cycles.

[0079] In the tests of Items 3, 4, and 5, the reinforcement process of the soil matrix includes: the prepared test blocks are reinforced by the spraying method: the prepared suspension is evenly sprayed onto the surface of the test blocks until it can no longer penetrate completely. Seal the test blocks with a sealed bag for 24 h to allow the surface reinforcement liquid to penetrate completely, and then place them in a curing box at a temperature of 25 °C and a humidity of 95% for 28 d and test their performance.

[0080] The performance test results are shown in Table 3.

[0081] Table 3 Performance test results

[0082]

[0083] As can be seen from Table 3, the 12-h bleeding water volume of the micro-nano suspension for reinforcing earthen sites prepared in the embodiment of the present invention based on the Ca / Mg / Si cementitious system is lower, indicating that it has high particle stability and storage timeliness; when using the suspension to reinforce earthen sites, it can deeply penetrate and diffuse in the earthen sites, effectively improve the surface hardness of the earthen sites to ensure more sufficient cementation of the weathered layer, and will not affect the surface color of the earthen sites, and can significantly improve the anti-erosion performance of the earthen sites in complex environments. It is a protective material that can meet the mechanical properties and compatibility requirements in the surface reinforcement of earthen sites.

[0084] Due to the fragile structure of the actual soil matrix, it is difficult to directly cut it for permeability testing. In this study, a glass sand chip (specification: radius R = 30 mm, thickness h = 5 mm, pore size 30 - 50 μm) was used as a simulated matrix to replace the natural soil matrix for permeability experiments, and the results are as Figure 4 shown.

[0085] Figure 4 It is the test diagram of the infiltration and diffusion test of the suspensions obtained in Example 4 and Comparative Example 1. As Figure 4 can be seen, the penetration depth and diffusion area ratio of Example 4 are significantly higher than those of Comparative Example 1, indicating that the suspension obtained by the present invention has good permeability in the soil matrix.

[0086] Figure 5 Apparent photos of the suspensions obtained in Example 4 and Comparative Example 1 after the environmental degradation test. As can be seen from Figure 5 the figure, only cracks occurred at the corners in Example 4, while large-area overall peeling was presented in Comparative Example 1.

[0087] From the above results, it can be seen that when the suspension prepared by the present invention is used for the reinforcement of earthen sites, it can deeply penetrate and diffuse in the earthen sites, effectively improve the surface hardness and the performance of resisting environmental degradation of the earthen sites, and has little influence on the surface color of the earthen sites. However, for the suspension prepared in the comparative example, the penetration depth and the surface hardness of the earthen matrix after reinforcement are both small, and the damage is relatively serious after the degradation test.

[0088] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0089] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A micro-nano suspension for reinforcing earthen sites based on a Ca / Mg / Si cementitious system, characterized in that, By mass parts, the raw materials include the following components: 5 - 6 parts of calcium hydroxide, 2 - 3 parts of magnesium hydroxide, 2 - 3 parts of siliceous volcanic ash material, 1.3 - 2 parts of dispersant, and 1000 - 1200 parts of water.

2. The micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system according to claim 1, wherein, The D90 particle size of the calcium hydroxide is ≤15 μm; the particle size of the magnesium hydroxide is D90 particle size ≤8 μm.

3. The micro-nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system according to claim 1, characterized in that, The siliceous volcanic ash material includes nano - silica and silica fume.

4. The micro-nano suspension for reinforcing earthen sites based on the Ca / Mg / Si cementitious system according to claim 3, characterized in that, The siliceous volcanic ash material, by mass parts, includes the following components: 0.5 - 0.8 parts of nano - silica and 1.5 - 2.5 parts of silica fume.

5. The micro-nano suspension for reinforcing earthen sites based on the Ca / Mg / Si cementitious system according to claim 4, characterized in that, The D90 particle size of the nano - silica is ≤80 nm; the D90 particle size of the silica fume is ≤5 μm.

6. The micro-nano suspension for reinforcing earthen ruins based on the Ca / Mg / Si cementitious system according to claim 1, characterized in that, The dispersant, by mass parts, includes the following components: 1 - 1.5 parts of melamine and 0.3 - 0.5 parts of cellulose ether.

7. The micro-nano suspension for reinforcing earthen sites based on the Ca / Mg / Si cementitious system according to claim 1, characterized in that, The micro - nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system further includes 0.6 - 1 part of water - reducing agent.

8. A preparation method of the micro-nano suspension for reinforcing earthen sites based on the Ca / Mg / Si cementitious system according to any one of claims 1 to 7, characterized in that, It includes the following steps: Mix each component according to the specified dosage to obtain the micro - nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system.

9. Application of the micro - nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system according to claim 8 in reinforcing the weathered layer on the surface of earthen heritage sites.

10. A reinforcement method for earthen heritage sites, characterized in that, It includes the following steps: Reinforce the earthen heritage site with the micro - nano suspension for reinforcing earthen heritage sites based on the Ca / Mg / Si cementitious system according to claim 8.

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