Quick-setting early-strength self-stress functional grouting material and expansibility testing method

Abstract

The invention belongs to the technical field of grouting materials, and particularly relates to a quick-setting early-strength self-stress functional grouting material and an expansibility testing method. The existing cement-based anchoring agent or mine filling body top-contacting agent and fractured rock mass grouting reinforcing agent have the phenomena of poor coupling effect, volume shrinkage and the like. The grouting material is composed of a component A and a component B, the component A mainly comprises sulphoaluminate cement, a water reducing agent, a retarder, a sodium salt accelerator and fibers, and the component B mainly comprises anhydrite, quicklime, a water reducing agent, an early strength agent, aluminum powder, a retarder and fibers. When in use, the mass ratio of the main components of the component A to the component B is (0.85-1.15): 1, and the water-cement ratio is (0.6-1.2): 1. When the water cement ratio is low (0.6-0.8: 1), the material can be used as an anchoring agent of an anchor rod; when the water-cement ratio is high (0.8-1.2): 1, the grouting agent can be used as a mine filling body top-contacting agent and a fractured rock mass grouting reinforcing agent; the invention further provides a simple testing method for the volume expansion rate and the expansion stress. And the method has obvious engineering application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of grouting materials, and particularly relates to a quick-setting, early-strength, self-stressing functional grouting material and a method for testing its expansibility. Background Art

[0002] In the field of underground engineering, such as water conservancy and hydropower projects, traffic tunnels, etc., most of the existing bolt anchoring materials use ordinary cement mortar. This traditional material has many drawbacks. Its setting time is long, the strength increases slowly, the early strength is low, and it is difficult to play the timely support role of the bolt on the surrounding rock. In addition, there are also problems such as poor toughness, low tensile strength, and volume shrinkage, which make it impossible for the bolt to fit tightly with the surrounding rock, resulting in a poor coupling effect and a poor support effect on the surrounding rock. In the scenario of deep soft rock tunnels in engineering, the high-stress environment requires the support structure formed by the filling body to play a role quickly and inhibit the rapid deformation of the surrounding rock. However, due to the above-mentioned shortcomings, ordinary cement mortar cannot meet this requirement when used as a filling body. Similarly, in the roof caving of mine filling bodies, the performance shortcomings of ordinary cement mortar make it impossible to achieve reliable roof caving, thereby affecting the support effect of the filling body on the roof. Summary of the Invention

[0003] The purpose of the present invention is to provide a quick-setting, early-strength, self-stressing functional grouting material and a method for testing its expansibility, so as to solve the problems in the prior art such as long setting time, low early strength, large volume shrinkage, and unstable expansibility of the grouting material. At the same time, a simple test method is provided to accurately evaluate the expansibility of the material.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The quick-setting, early-strength, self-stressing functional grouting material of the present invention is composed of component A and component B. Component A includes main material A and water A, and the mass ratio of water A to main material A is water-cement ratio A; Component B includes main material B and water B, and the mass ratio of water B to main material B is water-cement ratio B; By changing the proportional relationship of water-cement ratio A and water-cement ratio B, the grouting material has different functions and can be used as an anchoring agent for bolts, or as a roof caving agent for mine filling bodies and a grouting reinforcement agent for fractured rock masses;

[0006] The main materials included in main material A are as follows: sulfoaluminate cement clinker, water reducer, retarder, fiber, sodium salt quick-setting agent;

[0007] The main materials included in main material B are as follows: anhydrite, quicklime, water reducer, early-strength agent, aluminum powder, retarder, fiber;

[0008] The mass ratio of main material A to main material B is (0.85 - 1.15):1;

[0009] The ratio of water-cement ratio A to water-cement ratio B is (0.6 to 1.2):1;

[0010] Preferably, when the ratio of water-cement ratio A to water-cement ratio B is in the low water-cement ratio range of (0.6 to 0.8):1, the grouting material is used as an anchor grouting agent for bolts; when used as an anchor grouting agent, the setting time is 5 minutes to 20 minutes, the 3-day compressive strength is ≥15 MPa, the volume expansion rate is 1% to 3%, and the expansion stress is ≥2 MPa;

[0011] Preferably, when the ratio of water-cement ratio A to water-cement ratio B is in the high water-cement ratio range of (0.8 to 1.2):1, the grouting material is used as a roof contact agent for mine backfill and a grouting reinforcement agent for fractured rock masses; when used as a roof contact agent for mine backfill and a grouting reinforcement agent for fractured rock masses, the setting time is 15 minutes to 30 minutes, the 3-day compressive strength is ≥8 MPa, the volume expansion rate is 3% to 5%, and the expansion stress is ≥0.5 MPa;

[0012] When the ratio of water-cement ratio A to water-cement ratio B is 0.8:1, the grouting material can be used as an anchor grouting agent for bolts, and also as a roof contact agent for mine backfill and a grouting reinforcement agent for fractured rock masses;

[0013] Setting refers to final setting, referring to the national standard for testing the setting time of cement GB 1346-2011; quick setting is reflected in the setting time, and early strength is reflected in the 3-day compressive strength.

[0014] Preferably, the mass parts of the main materials in main material A are as follows: 85 to 115 parts of sulfoaluminate cement clinker, 0.8 to 1.2 parts of water reducer, 0.1 to 0.2 parts of retarder, 0.2 to 0.3 parts of fiber, and 1.2 to 1.5 parts of sodium salt quick setting agent;

[0015] Preferably, the mass parts of the main materials in main material B are as follows: 75 to 85 parts of anhydrite, 15 to 25 parts of quicklime, 0.5 to 0.8 parts of water reducer, 1.5 to 2 parts of early strength agent, 0.05 to 0.10 parts of aluminum powder, 0.1 to 0.2 parts of retarder, and 0.2 to 0.3 parts of fiber.

[0016] Preferably, the mass ratio of main material A to main material B is 1:1.

[0017] Preferably, the fibers in main material A and main material B are both basalt fibers.

[0018] Preferably, the water reducers in main material A and main material B are both naphthalene-based water reducers or polycarboxylate water reducers.

[0019] Preferably, the retarders in main material A and main material B are both sodium gluconate.

[0020] Preferably, the early strength agent in main material B is sodium sulfate, potassium sulfate, etc.

[0021] Preferably, the particle size of the aluminum powder in the main material B does not exceed 100 microns.

[0022] The main material A and water A are mixed to obtain slurry A, the main material B and water B are mixed to obtain slurry B, and slurry A and slurry B are mixed to obtain the grouting material; both slurry A and slurry B can remain non-solidified for more than 6 hours in the single slurry state before mixing, and the obtained grouting material can achieve rapid solidification within 5 minutes to 30 minutes after mixing.

[0023] Preferably, the stirring time of slurry A is greater than 15 minutes, and the stirring time of slurry B is greater than 15 minutes. After slurry A and slurry B are fully stirred and mixed evenly, the two slurries are then mixed.

[0024] When the ratio of water-cement ratio A to water-cement ratio B is 0.8:1, it is just an approximate demarcation point and is not so clear in practice. When the ratio of water-cement ratio A to water-cement ratio B is in the low water-cement ratio range, the grouting material is more suitable for bolt anchoring agents. When used as an anchoring agent, there is no restriction on the bolt model, and it can be filled in the borehole and inside the bolt for bonding the bolt and the surrounding rock.

[0025] When the ratio of water-cement ratio A to water-cement ratio B is in the high water-cement ratio range, the grouting material is more suitable for the roof contact of mine filling bodies and the grouting reinforcement of fractured rock masses. The roof contact of mine filling bodies means that when filling the mined-out mine cave, due to the shrinkage of the filling material (i.e., the filling body) after solidification, there is often a void zone between the filling body and the roof rock layer, which will cause the filling body to not support the roof well. Therefore, a material with a certain volume expansion degree after solidification is needed for filling to ensure that the filling body can fully contact the roof after solidification. The grouting reinforcement of fractured rock masses means that after the tunnel is excavated, the surrounding rock will generate many fractures due to stress action. The existence of these fractures will deteriorate the quality of the surrounding rock and even cause disasters such as large deformations and collapses. Therefore, it is necessary to grout the fractured rock masses to fill and reinforce the rock masses, and use the appropriate volume expansion of the filling material after solidification to make the filling body contact the rock mass more tightly, which is more conducive to enhancing the strength of the rock mass.

[0026] When the ratio of water-cement ratio A to water-cement ratio B is in the low water-cement ratio range, the material has a short solidification time, a relatively low volume expansion rate, higher compressive strength and expansion stress, and is more suitable for bolt anchoring agents, so that the material can quickly bond the bolt and the surrounding rock and form a certain strength, facilitating the early application of the pre-tightening force of the bolt and playing the bolt anchoring role. When the ratio of water-cement ratio A to water-cement ratio B is in the high water-cement ratio range, the material has a slow solidification time, a larger volume expansion rate, and the compressive strength and expansion stress are smaller than those at a lower water-cement ratio, but it meets the design strength of most filling bodies, and due to the high water-cement ratio, the material cost is low during large-scale filling.

[0027] The volume expansion rate of the rapid-setting, early-strength and self-stressing functional grouting material is tested by the following method:

[0028] (a) Prepare the grouting material by mixing Slurry A and Slurry B, fill the test mold with the grouting material and scrape the surface flat;

[0029] (b) Place a transparent thin glass plate on the top of the test mold;

[0030] (c) Use a displacement sensor with data recording function to measure the vertical displacement of the glass plate, and calculate the volume expansion rate through the following formula: Volume expansion rate = Displacement / Mold height × 100%.

[0031] Preferably, the test mold is a cylindrical mold made of cast iron, with an inner diameter of 50 mm and a height of 100 mm.

[0032] The expansion stress of the rapid-setting, early-strength and self-stressing functional grouting material is tested by the following method:

[0033] (a) Prepare the grouting material by mixing Slurry A and Slurry B, fill the test mold with the grouting material and scrape the surface flat;

[0034] (b) Place a steel plate on the top of the test mold, and install a force sensor with data recording function on the top of the steel plate;

[0035] (c) Place the test mold, steel plate and force sensor as a whole in a steel frame, adjust the steel frame to make the force sensor in close contact with the steel plate

[0036] and apply an initial pre-tightening force;

[0037] (d) Record the value of the force sensor during the curing process, and calculate the expansion stress through the following formula: Expansion stress = Force sensor value / Mold cross-sectional area.

[0038] Preferably, the test mold is a cylindrical mold made of cast iron, with an inner diameter of 50 mm and a height of 100 mm; the thickness of the steel plate is 10 mm - 20 mm, and the initial pre-tightening force is 50 N - 100 N.

[0039] The beneficial effects of the present invention are as follows:

[0040] The rapid-setting, early-strength and self-stressing functional grouting material of the present invention has significant advantages. It has a unique dual-slurry system. Before mixing Slurry A and Slurry B, the single slurry can remain non-solidified for more than 6 hours, giving construction workers sufficient operation time and greatly facilitating the on-site construction process. After mixing Slurry A and Slurry B, the solidification reaction can be quickly initiated, and the solidification time is 5 - 30 minutes, greatly shortening the construction waiting period. Moreover, the material will expand in volume after mixing, generating self-stress.

[0041] Under low water-cement ratio conditions, as an anchor grouting agent, it can apply prestress to the anchor in a short time by virtue of its quick-setting, early-strength and high-toughness characteristics, enabling the anchor to play a crack-inhibiting role as soon as possible and enhancing the stability of the surrounding rock; its swelling property can also promote strong coupling between the anchor and the surrounding rock, effectively inhibiting the displacement of the rock layer towards the tunnel wall. When the water-cement ratio is high, on the one hand, this material can be used as a grouting reinforcement material for fractured rock masses. With the expansion extrusion effect, the rock mass structure becomes more compact, promoting the rock mass to recover its three-dimensional stress state and effectively inhibiting the opening and sliding of weak planes. On the other hand, as the roof contact material for mine backfill, it can ensure that the backfill is closely attached to the roof surrounding rock, achieving reliable roof contact and providing a solid guarantee for the long-term stable operation of mine engineering.

[0042] In addition, the present invention also provides a test method for the expansion performance of the grouting material, which can simply and conveniently measure the volume expansion rate and expansion stress of the material under the consideration of lateral restraint. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the device for measuring the volume expansion rate of the grouting material of the present invention, where: 1 - cast iron test mold, 2 - glass plate, 3 - displacement sensor;

[0044] Figure 2 is a schematic diagram of the device for measuring the expansion stress of the grouting material of the present invention, where: 1 - cast iron test mold, 4 - steel plate, 5 - force sensor, 6 - steel frame. DETAILED DESCRIPTION OF THE INVENTION

[0045] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings. It should be noted that the embodiments described in the present invention are only used for further explanation and illustration, rather than limiting its application scope. Based on the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0046] The particle size of the aluminum powder used in the embodiment does not exceed 100 microns.

[0047] Example 1

[0048] The mass ratio of main material A and main material B is 1:1, and the ratio of water-cement ratio A and water-cement ratio B is a low water-cement ratio of 0.6:1. The grouting material is used as an anchor grouting agent.

[0049] Prepare main material A according to the following materials and their mass parts: 100 parts of sulfoaluminate cement clinker, 1.2 parts of naphthalene-based water reducer, 0.2 parts of retarder sodium gluconate, 0.2 parts of basalt fiber, 1.2 parts of sodium salt quick-setting agent;

[0050] The main material B is prepared with the following materials and their parts by mass: 80 parts of anhydrite, 20 parts of quicklime, 0.8 part of naphthalene-based water reducer, 1.6 parts of early strength agent sodium sulfate, 0.06 part of aluminum powder, 0.2 part of retarder sodium gluconate, and 0.3 part of basalt fiber.

[0051] Add appropriate amounts of water to the main material A and the main material B according to the above ratios, and stir for 20 minutes respectively to obtain slurry A and slurry B. Then mix slurry A and slurry B and stir well to make a mixed slurry, which is the grouting material. Referring to GB 1346 - 2011 and GB / T 17671 - 2019, the setting time of this grouting material can be measured to be 15 minutes respectively, and the compressive strength after 3 days is 20 MPa.

[0052] Volume expansion rate test:

[0053] (a) Inject the prepared grouting material into the cast iron test mold 1, fill the inside of the test mold and scrape the surface flat. The test mold is a cylindrical mold made of cast iron, with an inner diameter of 50 mm and a height of 100 mm for the test mold;

[0054] (b) Place a transparent thin glass plate 2 on the top of the test mold to completely cover the top of the test mold. The glass plate is very thin and light in weight, and its influence on the test data can be ignored;

[0055] (c) Use a displacement sensor 3 with data recording function to measure the vertical displacement of the thin glass plate, and calculate the volume expansion rate through the following formula: Volume expansion rate = displacement / test mold height × 100%.

[0056] The schematic diagram of the volume expansion rate measuring device is as Figure 1 shown. After 3 days, the displacement of the thin glass plate is measured to be 1.2 mm, and the volume expansion rate = 1.2 / 100 × 100% = 1.2%.

[0057] Expansion stress test:

[0058] (a) Inject the prepared grouting material into the cast iron test mold 1, fill the inside of the test mold and scrape the surface flat. The test mold is a cylindrical mold made of cast iron, with an inner diameter of 50 mm and a height of 100 mm for the test mold;

[0059] (b) Place a steel plate 4 with a thickness of 20 mm on the top of the test mold to completely cover the top of the test mold, and install a force sensor 5 with data recording function on the top of the steel plate;

[0060] (c) Place the cast iron test mold 1, the steel plate 4 and the force sensor 5 as a whole in the steel frame 6, adjust the steel frame 6 to make the force sensor 5 in close contact with the steel plate 4 and apply an initial pre-tightening force of 60 N;

[0061] (d) During the curing process, the value of the force sensor 5 is recorded and the expansion stress is calculated by the following formula: Expansion stress = force sensor value / test mold cross-sectional area.

[0062] Schematic diagram of the expansion stress measurement device Figure 2 After 3 days, the force sensor reading was 4350N and the cross-sectional area of ​​the test mold was 19.63cm 2 , expansion stress = 4350N / (19.63×10 -4 m 2 )=2.22MPa.

[0063] Example 2

[0064] The mass ratio of main material A to main material B is 1:1, the ratio of water-cement ratio A to water-cement ratio B is a high water-cement ratio of 1.2:1, and the grouting material is used for top connection of mine filling body or grouting reinforcement of fractured rock mass.

[0065] The main material A is prepared according to the following materials and their mass parts: 100 parts of sulphoaluminate cement clinker, 0.8 parts of naphthalene-based water reducer, 0.1 parts of retarder sodium gluconate, 0.3 parts of basalt fiber, and 1.5 parts of sodium salt accelerator;

[0066] Main material B was prepared according to the following materials and their mass proportions: 80 parts of anhydrite, 20 parts of quicklime, 0.5 parts of naphthalene-based water reducer, 2 parts of early strength agent sodium sulfate, 0.10 parts of aluminum powder, 0.1 parts of retarder sodium gluconate, and 0.3 parts of basalt fiber.

[0067] According to the above ratio, add appropriate amount of water to main material A and main material B respectively, stir for 20 minutes, and prepare slurry A and slurry B respectively. Then mix slurry A and slurry B, and stir them fully to prepare mixed slurry, i.e. grouting material. With reference to GB 1346-2011 and GB / T 17671-2019, it can be measured that the setting time of the mixed slurry is 25 minutes, and the compressive strength is 10MPa after 3 days.

[0068] Volume expansion test:

[0069] The testing method is the same as that in Example 1. After 3 days, the displacement of the thin glass plate is measured to be 3.5 mm, and the volume expansion rate = 3.5 / 100×100% = 3.5%.

[0070] Expansion stress test:

[0071] The test method is the same as that in Example 1. After 3 days, the force sensor reading is 1050N and the cross-sectional area of ​​the test mold is 19.63cm 2 , expansion stress = 1050N / (19.63×10 -4 m 2 )=0.54MPa.

[0072] Comparative Example 1

[0073] Replace the anhydrite in the main material B of Example 1 with gypsum or replace quicklime with hydrated gypsum, and keep other conditions the same as those in Example 1. The compressive strength of the grouting material measured after 3 days is lower than 15 MPa.

[0074] Comparative Example 2

[0075] Replace the early strength agent in the main material B of Example 1 with magnesium sulfate or calcium sulfate, and keep other conditions the same as those in Example 1. The volume expansion rate of the grouting material measured after 3 days is lower than 0.5%.

[0076] Comparative Example 3

[0077] Replace the fibers in both main material A and main material B of Example 1 with polypropylene fibers, and keep other conditions the same as those in Example 1. The compressive strength of the grouting material measured after 3 days is lower than 15 MPa.

[0078] Adjust the mass parts of basalt fibers in both main material A and main material B of Example 1 to 0.5 part, and keep other conditions the same as those in Example 1. Then, obvious agglomeration of fibers occurs in slurry A and slurry B.

[0079] Comparative Example 4

[0080] Adjust the dosage of retarder in both main material A and main material B of Example 1 to 0.4 part, and keep other conditions the same as those in Example 1. Then, the setting time of the grouting material after mixing slurry A and slurry B is more than 30 minutes.

[0081] Comparative Example 5

[0082] When preparing slurry A and slurry B in Example 1, after adding water to the main materials, stir for only 1 minute and then mix slurry A and slurry B to make the grouting material, and keep other conditions the same as those in Example 1. The volume expansion rate of the grouting material after setting for 3 days is less than 0.5%.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacement on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present invention.

Claims

1. A rapid-setting, early-strength, self-stress functional grouting material, characterized in that: The invention comprises the following contents: the grouting material is composed of component A and component B, component A comprises main material A and water A, and the mass ratio of water A to main material A is water-cement ratio A; component B comprises main material B and water B, and the mass ratio of water B to main material B is water-cement ratio B; by changing the proportional relationship between water-cement ratio A and water-cement ratio B, the grouting material has different functions, such as being used as an anchoring agent for bolts, or as a top joint agent for mine filling bodies and a grouting reinforcement agent for fractured rock masses; The main materials A include the following: sulphoaluminate cement clinker, water reducing agent, retarder, fiber, sodium salt accelerator; The main materials of the main material B are as follows: anhydrite, quicklime, water reducing agent, early strength agent, aluminum powder, retarder, fiber; The mass ratio of the main material A to the main material B is (0.85-1.15):1; The ratio of water-cement ratio A to water-cement ratio B is (0.6~1.2):

1.

2. The rapid-setting, early-strength, self-stress functional grouting material according to claim 1, characterized in that: When the ratio of water-cement ratio A to water-cement ratio B is in the low water-cement ratio range of (0.6-0.8):1, the grouting material serves as an anchoring agent for the anchor rod; When the ratio of water-cement ratio A to water-cement ratio B is in the high water-cement ratio range of (0.8-1.2):1, the grouting material is used as a top joint agent for mine filling and a grouting reinforcement agent for fractured rock mass; When the ratio of water-cement ratio A to water-cement ratio B is 0.8:1, the grouting material can be used as an anchoring agent for anchor rods, as well as a top-jointing agent for mine filling bodies and a grouting reinforcement agent for fractured rock masses.

3. The rapid-setting, early-strength, self-stress functional grouting material according to claim 2, characterized in that: The setting time of the grouting material when used as an anchoring agent is 5 minutes to 20 minutes, the 3-day compressive strength is ≥15MPa, the volume expansion rate is 1% to 3%, and the expansion stress is ≥2MPa; The grouting material has a setting time of 15 to 30 minutes when used as a mine filling body joint agent and a fractured rock mass grouting reinforcement agent, a 3-day compressive strength of ≥8MPa, a volume expansion rate of 3% to 5%, and an expansion stress of ≥0.5MPa.

4. The rapid-setting, early-strength, self-stress functional grouting material according to claim 1, characterized in that: The mass parts of the main materials in the main material A are as follows: 85-115 parts of sulphoaluminate cement clinker, 0.8-1.2 parts of water reducing agent, 0.1-0.2 parts of retarder, 0.2-0.3 parts of fiber, and 1.2-1.5 parts of sodium salt accelerator; The mass parts of the main materials in the main material B are as follows: 75-85 parts of anhydrite, 15-25 parts of quicklime, 0.5-0.8 parts of water reducing agent, 1.5-2 parts of early strength agent, 0.05-0.10 parts of aluminum powder, 0.1-0.2 parts of retarder, and 0.2-0.3 parts of fiber.

5. The rapid-setting, early-strength, self-stress functional grouting material according to claim 1, characterized in that: The mass ratio of main material A to main material B is 1:1; The fibers described in the main material A and the main material B are both basalt fibers; The water reducers described in the main material A and the main material B are naphthalene-based water reducers or polycarboxylic acid water reducers; The retarder described in the main material A and the main material B is sodium gluconate; The early strength agent of the main material B is sodium sulfate or potassium sulfate; The particle size of the aluminum powder of the main material B is less than 100 microns.

6. The rapid-setting, early-strength, self-stress functional grouting material according to claim 1, characterized in that: The main material A and water A are mixed to obtain slurry A, the main material B and water B are mixed to obtain slurry B, and slurry A and slurry B are mixed to obtain the grouting material; Both slurry A and slurry B can remain unsolidified for more than 6 hours in the single slurry state before mixing, and the grouting material obtained after mixing can achieve rapid solidification within 5 minutes to 30 minutes.

7. The rapid-setting, early-strength, self-stress functional grouting material according to claim 6, characterized in that: The stirring time of the slurry A is greater than 15 minutes, and the stirring time of the slurry B is greater than 15 minutes. After the slurry A and the slurry B are fully stirred and uniformly mixed, the two slurries are mixed.

8. The rapid-setting, early-strength, self-stress functional grouting material according to claim 3, characterized in that: The volume expansion rate is tested by the following method: (a) Prepare grouting material by mixing component A and component B, fill the test mold with the grouting material and smooth the surface; (b) Place a glass plate on top of the test mold; (c) The vertical displacement of the glass plate is measured using a displacement sensor with a data recording function, and the volume expansion rate is calculated using the following formula: volume expansion rate = displacement / test mold height × 100%.

9. The rapid-setting, early-strength, self-stress functional grouting material according to claim 3, characterized in that: The expansion stress is tested by the following method: (a) Prepare grouting material by mixing component A and component B, fill the test mold with the grouting material and smooth the surface; (b) A steel plate is placed on the top of the test mold, and a force sensor with data recording function is installed on the top of the steel plate; (c) Place the test mold, steel plate and force sensor as a whole in a steel frame, adjust the steel frame so that the force sensor is in close contact with the steel plate and apply an initial preload; (d) During the curing process, the force sensor value is recorded and the expansion stress is calculated using the following formula: Expansion stress = force sensor value / cross-sectional area of ​​the test mold.

10. A rapid-setting, early-strength, self-stress functional grouting material according to claim 8 or 9, characterized in that: The test molds for testing the volume expansion rate and expansion stress are both cylindrical molds made of cast iron, with an inner diameter of 50 mm and a height of 100 mm.

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