Rapid reinforcing material and reinforcing method for bottom plate mudstone

Abstract

The invention belongs to the technical field of bottom plate mudstone treatment, and particularly relates to a rapid reinforcing material and method for bottom plate mudstone. The rapid reinforcing material for the bottom plate mudstone comprises the following components in parts by mass: a material A: 40-60 parts of sulphoaluminate cement, 15-40 parts of Portland cement and 1-2 parts of a naphthalene water reducer, and further comprises an initiator, a cross-linking agent and a redox agent; and a material B: 80-100 parts of gypsum, 10-30 parts of acrylamide and 2-4 parts of an aluminate coupling agent. According to the rapid reinforcing material for the bottom plate mudstone, the on-site argillization bottom plate can be hardened on site, a bottom plate hardening layer meeting the bearing condition is formed, the labor cost and the time cost caused by cleaning of bottom plate argillization substances are reduced, the passing smoothness is guaranteed, the project progress is accelerated, and the project benefits and the economic benefits are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of floor mudstone treatment, and particularly relates to a rapid reinforcement material for floor mudstone and a reinforcement method. Background Art

[0002] The geological structures of coal mines in central and western China are relatively complex. The bedrock of the driving roadway floor is mainly argillaceous weakly cemented mudstone. Such surrounding rocks have poor cementing ability, low strength, and are prone to argillization when encountering water. During the coal mining process, stress concentration causes the cracks in the mudstone to expand and connect, making it easier for groundwater to penetrate into the rock interior, accelerating the argillization process of the floor rock. At the same time, the driving activity destroys the original groundwater seepage path in the rock mass, and a large amount of groundwater converges to the roadway floor, coming into contact with the floor rock for a long time, prompting components such as clay minerals in the floor rock to argillize when encountering water. A large amount of water is also required during the driving process to ensure the normal operation of the driving bit. The completed driving sections are exposed. Due to the combined effects of factors such as ventilation and drainage, the humidity and temperature conditions of the floor mudstone change. Due to poor drainage, the floor is immersed in groundwater for a long time, exacerbating the argillization of the floor. Due to the existence of the above factors, serious argillization of the driving roadway floor occurs, and the argillization depth ranges from 20 cm to 100 cm, seriously affecting the normal production and safety of coal mines.

[0003] The measures currently taken by major coal mines to deal with argillized floors mainly include: using a loader to transport the argillized floor materials out of the roadway; laying a scraper conveyor in the roadway to scrape the argillized materials onto the conveyor and transport them out of the roadway; using a high-pressure water gun to wash the argillized floor, dispersing the argillized materials into slurry, and then discharging the slurry through a water channel or drainage equipment; manually using tools such as shovels for excavation and cleaning. There are generally problems such as large cost investment, low efficiency, and affecting the production progress.

[0004] Therefore, an improved technical solution is needed to address the deficiencies of the above existing technologies. Summary of the Invention

[0005] The purpose of the present invention is to provide a rapid reinforcement material for floor mudstone and a reinforcement method, which can help solve or improve at least one of the problems of large disposal cost investment, low efficiency, and affecting production progress of the current floor mudstone.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: 1. A rapid reinforcement material for floor mudstone, in parts by mass, includes: Material A: 40 - 60 parts of sulfoaluminate cement, 15 - 40 parts of Portland cement, and 1 - 2 parts of naphthalene-based water reducer, and also includes an initiator, a crosslinking agent, and an oxidation-reduction agent; Material B: 80 - 100 parts of gypsum, 10 - 30 parts of acrylamide, and 2 - 4 parts of aluminate coupling agent.

[0007] Preferably, the mass ratio of Material A to Material B is 1:1.

[0008] Preferably, the initiator is ammonium persulfate, and the mass of the initiator is 0.5%-2% of that of acrylamide; the crosslinking agent is N,N-methylenebisacrylamide, and the mass of the crosslinking agent is 0.5%-2% of that of acrylamide; the redox agent is sodium bisulfite, and the mass of the redox agent is 0.5% of that of acrylamide.

[0009] Preferably, the particle size of the rapid reinforcement material for floor mudstone is <20 μm.

[0010] Preferably, the components of the rapid reinforcement material for floor mudstone further include water, and the dosage of water is 50%-70% of the sum of the masses of material A and material B.

[0011] The present invention also provides a method for rapidly reinforcing floor mudstone, which adopts the following technical solution: a method for rapidly reinforcing floor mudstone, using the rapid reinforcement material for floor mudstone as described above for reinforcement.

[0012] Preferably, it includes the following steps: (1) adding water to the floor mudstone and mixing evenly to obtain a floor mudstone slurry; (2) adding material B to the floor mudstone slurry and mixing evenly to obtain a first slurry; (3) adding material A to the first slurry and mixing evenly to obtain a second slurry; (4) leveling the second slurry and allowing it to stand and harden, thereby realizing the reinforcement of the floor mudstone.

[0013] Preferably, the mass ratio of the rapid reinforcement material for floor mudstone to the floor mudstone is 1:2 - 1:3.

[0014] Preferably, in step (4), the hardening time is 10 - 20 min.

[0015] Beneficial effects:

[0016] (1) In view of the problems of large cost investment, low efficiency, and impact on production progress in the process of treating floor slime layers in major coal mines at present, the present invention provides a rapid reinforcement material for floor mudstone. This rapid reinforcement material for floor mudstone can harden the on-site slime floor in place to form a floor hardening layer that meets the load-bearing conditions, reduce the labor cost and time cost caused by cleaning the floor slime, ensure the smoothness of passage, speed up the project progress, and improve the project benefit and economic benefit.

[0017] (2) The rapid reinforcement material for floor mudstone of the present invention uses acrylamide to toughen and modify the reinforcement material. After acrylamide polymerization, an interpenetrating network structure is formed with the hydration products of the cement-based material, effectively improving the disadvantages of poor flexural performance and low toughness of the cement-based material, and increasing the early strength, toughness, and durability of the hardened floor.

[0018] (3) The surface of the floor mudstone and the hydration products of acrylamide polymerization and cement-based materials are surface-modified with aluminate coupling agent, so that their surfaces are modified from hydrophilic to hydrophobic, which can prevent water penetration and help improve the durability and water erosion resistance of the hardened floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0020] Figure 1 It is a simulation diagram of the hydration products of the rapid reinforcement material for floor mudstone provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the interaction between aluminate coupling agent and floor mudstone and the hydration products of the reinforcement material provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0023] The present invention will be described in detail below with reference to the embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0024] In view of at least one of the problems of high cost input, low efficiency, and affecting the production progress existing in the current disposal process of the roadway floor mud layer, the present invention provides a rapid reinforcement material for floor mudstone.

[0025] The rapid strengthening material for floor mudstone in the embodiments of the present invention, by mass parts, includes: Material A: 40-60 parts (such as 40 parts, 45 parts, 50 parts, 55 parts or 60 parts) of sulfoaluminate cement, 15-40 parts (such as 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts) of portland cement and 1-2 parts (such as 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts) of naphthalene series water reducing agent, and also includes initiator, crosslinking agent and redox agent; Material B: 80-100 parts (such as 80 parts, 85 parts, 90 parts, 95 parts or 100 parts) of gypsum, 10-30 parts (such as 10 parts, 15 parts, 20 parts, 25 parts or 30 parts) of acrylamide and 2-4 parts (such as 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts) of aluminate coupling agent. Among them, both Material A and Material B are solids (powdered materials), and Material A and Material B are stored separately before being used for strengthening the floor mudstone. Among them, if the proportion of sulfoaluminate cement in Material A is too high, it will cause serious reverse shrinkage of the strength of the strengthening material in the later stage; if the proportion of portland cement is too high, it will prolong the setting time of the strengthening material and reduce the early strength at the same time; if the proportion of gypsum in Material B is too high, it will cause the strengthening material to set too quickly, and at the same time the early heat release is too large, which is easy to cause cracking of the strengthened floor; if the proportion of gypsum is too low, it will cause the setting time of the strengthening material to be too slow and cannot meet the strengthening requirements; if the proportion of acrylamide is too high, it will cause the mechanical properties of the strengthening material to decrease; if the proportion of acrylamide is too low, the toughening effect on the strengthening material is not obvious; if the dosage of aluminate coupling agent is too large, it will delay and hinder the hydration process of the strengthening material, and if the dosage is too small, the modification effect on the floor mudstone and the hydration products of the material is not ideal.

[0026] In the rapid strengthening material for floor mudstone of the present invention, acrylamide is selected to in-situ polymerize and toughen the gelling system, which helps to improve the overall toughness of the hardened floor. In the presence of initiator and crosslinking agent, acrylamide is induced to undergo free radical polymerization through the heat released by cement hydration to form polyacrylamide. At this time, the products in the stone body are cement hydration products and polyacrylamide; since the polymerization reaction is also an exothermic process, it causes the temperature of the reaction system to rise, promoting cement hydration, thereby forming an interpenetrating network structure intertwined by ettringite (AFt) and polyacrylamide (PAM) (as Figure 1 shown). The aluminate coupling agent in the present invention can play a role in improving the durability and water erosion resistance of the strengthened floor mudstone; the aluminate coupling agent can adjust the size of the surface contact angle between the floor mudstone and water to improve the water erosion resistance of the floor mudstone (the mechanism of action is shown in Figure 2);The aluminate coupling agent is a powdery material, which is more suitable for use in the construction process; when the aluminate coupling agent is used alone, since the environmental temperature cannot reach the appropriate working temperature of the coupling agent (60-80°C), the surface modification effect on the floor mudstone cannot achieve the expected goal; in the rapid strengthening material for floor mudstone of the present invention, the selected sulfoaluminate cement, portland cement and gypsum will release a large amount of heat during the hydration process, which can provide an appropriate working temperature for the aluminate coupling agent and at the same time promote the polymerization reaction of acrylamide.

[0027] In a preferred embodiment of the rapid strengthening material for floor mudstone of the present invention, the mass ratio of material A to material B is 1:1.

[0028] In a preferred embodiment of the rapid strengthening material for floor mudstone of the present invention, the initiator is ammonium persulfate, and the mass of the initiator is 0.5%-2% of acrylamide (for example, 0.5%, 1%, 1.5% or 2%); the crosslinking agent is N,N'-methylenebisacrylamide (MBA), and the mass of the crosslinking agent is 0.5%-2% of acrylamide (for example, 0.5%, 1%, 1.5% or 2%); the redox agent is sodium bisulfite, and the mass of the redox agent is 0.5% of acrylamide. Among them, the dosages of the initiator, crosslinking agent and redox agent can also play a role in adjusting the hardening time of the floor mudstone to a certain extent.

[0029] Preferably, the aluminate coupling agent is aluminate coupling agent DL-411.

[0030] In a preferred embodiment of the rapid strengthening material for floor mudstone of the present invention, the particle size of the rapid strengthening material for floor mudstone is <20μm, and the setting time (initial setting time) for mixing and strengthening with the floor mudstone is 20-40 min. Among them, if the particle size of the floor mudstone strengthening material is too large, due to the decrease in the degree of hydration between materials, the strength of the floor hardening layer will decrease.

[0031] In a preferred embodiment of the rapid strengthening material for floor mudstone of the present invention, the components of the strengthening material further include water, and the dosage of water is 50%-70% (for example, 50%, 55%, 60%, 65% or 70%) of the sum of the masses of material A and material B.

[0032] The present invention also proposes a method for rapidly strengthening floor mudstone. The method for rapidly strengthening floor mudstone in the embodiment of the present invention: strengthening is carried out by using the rapid strengthening material for floor mudstone as described above.

[0033] In a preferred embodiment of the method for rapid reinforcement of floor mudstone of the present invention, the following steps are included: (1) adding water to the floor mudstone and mixing it evenly to obtain floor mudstone slurry; (2) adding material B to the floor mudstone slurry and mixing it evenly to obtain a first slurry; (3) adding material A to the first slurry and mixing it evenly to obtain a second slurry; (4) leveling the second slurry and letting it stand to harden, thereby achieving the reinforcement of the floor mudstone. Among them, by first mixing the floor mudstone slurry with material B, the aluminate coupling agent in material B can modify the floor mudstone, and the surface of the floor mud can be changed from hydrophilic to hydrophobic, which helps to make the mudstone reinforced by the method of the present invention have a better effect of preventing water penetration.

[0034] In a preferred embodiment of the method for rapid reinforcement of floor mudstone of the present invention, the mass ratio of the rapid reinforcement material for floor mudstone to the floor mudstone is 1:2-1:3 (for example, 1:2, 1:2.2, 1:2.4, 1:2.6, 1:2.8 or 1:3). If the amount of reinforcement material is too large, the surface of the floor hardened layer will not contain floor mudstone, which is different from the main component of the hardened layer and cause cracking of the surface layer; if the amount of reinforcement material is too small, the floor mudstone cannot be fully hardened, resulting in unsatisfactory reinforcement effect.

[0035] Preferably, the amount of reinforcement material corresponding to the area per square meter with a mud depth of 20 cm is 100 kg.

[0036] In a preferred embodiment of the method for rapid reinforcement of floor mudstone of the present invention, a pneumatic agitator is used for mixing in step (2) and / or (3).

[0037] Preferably, in step (2), the mixing time of the bottom plate mudstone slurry and material B is ≥10 min. If the mixing time is too short, material B and the bottom plate mudstone slurry will be unevenly mixed, affecting the reinforcement effect. Water can be added as appropriate during the mixing process depending on the actual situation to ensure uniform mixing of the materials. In step (3), the mixing time of the first slurry and material A is at least 10 min. If the mixing time is too short, the composition of the bottom plate hardened layer will be uneven, causing cracking. The mixing time can be appropriately extended. If the mixing time is too short, water can be added as appropriate during the mixing process depending on the actual situation to ensure uniform mixing of the materials.

[0038] In a preferred embodiment of the method for rapid reinforcement of bottom mudstone of the present invention, in step (4), the hardening time is 10-20 min (for example, 10 min, 12 min, 14 min, 16 min, 18 min or 20 min).

[0039] The bottom plate mudstone rapid reinforcement material and method of the present invention are described in detail below through specific embodiments.

[0040] The main raw materials used in the following examples: The grade of sulfoaluminate cement is 72.5; the portland cement is ordinary portland cement with a grade of P.O 42.5; the gypsum is hemihydrate gypsum; the initiator is ammonium persulfate; the crosslinking agent is N,N-methylenebisacrylamide; the redox agent is sodium bisulfite; the aluminate coupling agent is aluminate coupling agent DL-411.

[0041] Example 1

[0042] The rapid reinforcement material for floor mudstone in this example, by mass fraction, the raw material composition includes:

[0043] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, 1.5 parts of naphthalene-based water reducer;

[0044] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0045] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B (that is, when using the reinforcement material in this example to reinforce the floor mudstone, the mass of water is 60% of the sum of the masses of Material A and Material B).

[0046] The rapid reinforcement method for floor mudstone in this example includes the following steps:

[0047] (1) According to the degree of slime of the floor, add an appropriate amount of water to dilute the floor slime layer to a suitable degree to obtain a floor mudstone magma;

[0048] (2) Spread an appropriate amount of Material B on the floor mudstone magma in the hardened area, start the pneumatic stirrer to stir Material B and the floor mudstone magma, set the stirrer speed to 300 r / min, and the duration is 10 min. During the stirring process, add water as appropriate according to the actual situation to ensure that the materials are evenly stirred to obtain the first slurry;

[0049] (3) After evenly spreading an appropriate amount of Material A in the first slurry, start the pneumatic stirrer to fully stir Material A and the first slurry, control the stirring time to 10 min, set the stirrer speed to 300 r / min, and add water as appropriate according to the actual situation during the stirring process to ensure that the materials are evenly stirred;

[0050] (4) After confirming that the floor hardening material and the slime floor have been evenly stirred and the mixing degree meets the requirements, use a suitable tool to level the surface of the hardened floor to make its surface flat and smooth. After 10 - 20 min, the local area is hardened.

[0051] The floor hardening process adopts the method of hardening in a unit area. After the hardening of one unit area is completed, the hardening work of the next unit area is immediately carried out in this area; the dosage of the floor mudstone rapid reinforcement material in the present embodiment corresponding to a unit square area with a mudification depth of 20 cm is 100 kg.

[0052] Example 2

[0053] The raw material composition of the floor mudstone rapid reinforcement material in the present embodiment, by mass fraction, includes:

[0054] Material A: 50 parts of sulfoaluminate cement, 40 parts of Portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, and 1.5 parts of naphthalene-based water reducer;

[0055] Material B: 100 parts of gypsum, 15 parts of acrylamide, and 2 parts of aluminate coupling agent;

[0056] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0057] The floor mudstone rapid reinforcement method in the present embodiment is the same as that in Example 1.

[0058] Example 3

[0059] The raw material composition of the floor mudstone rapid reinforcement material in the present embodiment, by mass fraction, includes:

[0060] Material A: 40 parts of sulfoaluminate cement, 40 parts of Portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, and 1.5 parts of naphthalene-based water reducer;

[0061] Material B: 100 parts of gypsum, 15 parts of acrylamide, and 2 parts of aluminate coupling agent;

[0062] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0063] The floor mudstone rapid reinforcement method in the present embodiment is the same as that in Example 1.

[0064] Example 4

[0065] The raw material composition of the floor mudstone rapid reinforcement material in the present embodiment, by mass fraction, includes:

[0066] Material A: 60 parts of sulfoaluminate cement, 25 parts of Portland cement, 1.0% of the mass of initiator based on the mass of acrylamide, 1.0% of the mass of crosslinking agent based on the mass of acrylamide, 0.5% of the mass of redox initiator based on the mass of acrylamide, 1.5 parts of naphthalene series water reducer;

[0067] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0068] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0069] The method for rapid reinforcement of floor mudstone in this example is the same as that in Example 1.

[0070] Example 5

[0071] The raw material composition of the rapid reinforcement material for floor mudstone in this example, by mass fraction, includes:

[0072] Material A: 60 parts of sulfoaluminate cement, 15 parts of Portland cement, 1.0% of the mass of initiator based on the mass of acrylamide, 1.0% of the mass of crosslinking agent based on the mass of acrylamide, 0.5% of the mass of redox initiator based on the mass of acrylamide, 1.5 parts of naphthalene series water reducer;

[0073] Material B: 100 parts of gypsum, 20 parts of acrylamide, 3 parts of aluminate coupling agent;

[0074] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0075] The method for rapid reinforcement of floor mudstone in this example is the same as that in Example 1.

[0076] Example 6

[0077] The raw material composition of the rapid reinforcement material for floor mudstone in this example, by mass fraction, includes:

[0078] Material A: 60 parts of sulfoaluminate cement, 40 parts of Portland cement, 0.5% of the mass of initiator based on the mass of acrylamide, 1.0% of the mass of crosslinking agent based on the mass of acrylamide, 0.5% of the mass of redox initiator based on the mass of acrylamide, 1.5 of naphthalene series water reducer;

[0079] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0080] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0081] The method for rapid reinforcement of floor mudstone in this example is the same as that in Example 1.

[0082] Example 7

[0083] The rapid reinforcement material for floor mudstone in this example, by mass fraction, the raw material composition includes:

[0084] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 2.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, 1.5 parts of naphthalene-based water reducer;

[0085] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0086] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0087] The rapid reinforcement method for floor mudstone in this example is the same as that in Example 1.

[0088] Example 8

[0089] The rapid reinforcement material for floor mudstone in this example, by mass fraction, the raw material composition includes:

[0090] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 0.5% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, 1.5 parts of naphthalene-based water reducer;

[0091] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0092] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0093] The rapid reinforcement method for floor mudstone in this example is the same as that in Example 1.

[0094] Example 9

[0095] The rapid reinforcement material for floor mudstone in this example, by mass fraction, the raw material composition includes:

[0096] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 2.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, 1.5 parts of naphthalene-based water reducer;

[0097] Material B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of aluminate coupling agent;

[0098] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0099] The method for rapid reinforcement of floor mudstone in this embodiment is the same as that in Embodiment 1.

[0100] Embodiment 10

[0101] The rapid reinforcement material for floor mudstone in this embodiment, in terms of mass parts, the raw material composition includes:

[0102] Material A: 60 parts of sulfoaluminate cement, 40 parts of Portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, and 1.5 parts of naphthalene-based water reducer;

[0103] Material B: 100 parts of gypsum, 10 parts of acrylamide, and 2 parts of aluminate coupling agent;

[0104] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0105] The method for rapid reinforcement of floor mudstone in this embodiment is the same as that in Embodiment 1.

[0106] Embodiment 11

[0107] The rapid reinforcement material for floor mudstone in this embodiment, in terms of mass parts, the raw material composition includes:

[0108] Material A: 60 parts of sulfoaluminate cement, 40 parts of Portland cement, the mass of the initiator is 1.0% of the mass of acrylamide, the mass of the crosslinking agent is 1.0% of the mass of acrylamide, the mass of the redox agent is 0.5% of the mass of acrylamide, and 1.5 parts of naphthalene-based water reducer;

[0109] Material B: 100 parts of gypsum, 30 parts of acrylamide, and 2 parts of aluminate coupling agent;

[0110] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0111] The method for rapid reinforcement of floor mudstone in this embodiment is the same as that in Embodiment 1.

[0112] Embodiment 12

[0113] The rapid reinforcement material for floor mudstone in this embodiment, in terms of mass parts, the raw material composition includes:

[0114] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, 1.0% of the mass of initiator based on the mass of acrylamide, 1.0% of the mass of crosslinking agent based on the mass of acrylamide, 0.5% of the mass of redox initiator based on the mass of acrylamide, 1.5 parts of naphthalene series water reducer;

[0115] Material B: 100 parts of gypsum, 15 parts of acrylamide, 3 parts of aluminate coupling agent;

[0116] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0117] The method for rapid reinforcement of floor mudstone in this example is the same as that in Example 1.

[0118] Comparative Example 1

[0119] The difference between this comparative example and Example 1 is that acrylamide polymerization toughening is not involved.

[0120] The reinforcing material for floor mudstone in this comparative example, by mass fraction, the raw material composition includes:

[0121] Material A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, 1.5 parts of naphthalene series water reducer;

[0122] Material B: 100 parts of gypsum, 2 parts of aluminate coupling agent;

[0123] The mass ratio of Material A to Material B is 1:1, and the mass of water accounts for 60% of the total mass of Material A and Material B.

[0124] The method for reinforcing floor mudstone in this comparative example is the same as that in Example 1.

[0125] Comparative Example 2

[0126] The difference between this comparative example and Example 1 is that acrylamide polymerization toughening is not involved, and PP fibers are used for toughening.

[0127] The reinforcing material for floor mudstone in this comparative example, by mass fraction, the raw material composition includes: 60 parts of sulfoaluminate cement, 40 parts of portland cement, 100 parts of gypsum, 1.5 parts of naphthalene series water reducer, 2 parts of PP fibers (length 3 mm), 40 parts of water (tap water) and 2 parts of aluminate coupling agent.

[0128] The method for reinforcing floor mudstone in this comparative example is the same as that in Example 1.

[0129] Comparative Example 3

[0130] The difference between this comparative example and Example 1 is that the sulfoaluminate cement is replaced with aluminate cement.

[0131] The reinforcing material for floor mudstone in this comparative example, by mass fraction, the raw material composition includes:

[0132] Component A: 60 parts of aluminate cement (CA-70), 40 parts of portland cement, the mass of the initiator is 1.0% of that of acrylamide, the mass of the crosslinking agent is 1.0% of that of acrylamide, the mass of the redox agent is 0.5% of that of acrylamide, and 1.5 parts of naphthalene series water reducer;

[0133] Component B: 100 parts of gypsum, 15 parts of acrylamide, and 2 parts of aluminate coupling agent;

[0134] The mass ratio of Component A to Component B is 1:1, and the mass of water accounts for 60% of the total mass of Component A and Component B.

[0135] The method for reinforcing floor mudstone in this comparative example is the same as that in Example 1.

[0136] Comparative Example 4

[0137] The difference between this comparative example and Example 1 lies in that no surface modification treatment with aluminate coupling agent is involved.

[0138] The reinforcing material for floor mudstone in this comparative example, in terms of mass parts, the raw material composition includes:

[0139] Component A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 1.0% of that of acrylamide, the mass of the crosslinking agent is 1.0% of that of acrylamide, the mass of the redox agent is 0.5% of that of acrylamide, and 1.5 parts of naphthalene series water reducer;

[0140] Component B: 100 parts of gypsum, 15 parts of acrylamide;

[0141] The mass ratio of Component A to Component B is 1:1, and the mass of water accounts for 60% of the total mass of Component A and Component B.

[0142] The method for reinforcing floor mudstone in this comparative example is the same as that in Example 1.

[0143] Comparative Example 5

[0144] The difference between this comparative example and Example 1 lies in that silane coupling agent KH570 is used to replace the aluminate coupling agent.

[0145] The reinforcing material for floor mudstone in this comparative example, in terms of mass parts, the raw material composition includes:

[0146] Component A: 60 parts of sulfoaluminate cement, 40 parts of portland cement, the mass of the initiator is 1.0% of that of acrylamide, the mass of the crosslinking agent is 1.0% of that of acrylamide, the mass of the redox agent is 0.5% of that of acrylamide, and 1.5 parts of naphthalene series water reducer;

[0147] Component B: 100 parts of gypsum, 15 parts of acrylamide, 2 parts of silane coupling agent KH570;

[0148] The mass ratio of Component A to Component B is 1:1, and the mass of water accounts for 60% of the total mass of Components A and B.

[0149] The method for reinforcing the floor mudstone in this comparative example is the same as that in Example 1.

[0150] Comparative Example 6

[0151] The difference between this comparative example and Example 1 is only that: the dosage of aluminate coupling agent is 0.5 part; the rest are the same as those in Example 1.

[0152] Comparative Example 7

[0153] The difference between this comparative example and Example 1 is only that: the dosage of aluminate coupling agent is 5 parts; the rest are the same as those in Example 1.

[0154] Comparative Example 8

[0155] The difference between this comparative example and Example 1 is only that: the dosage of acrylamide is 5 parts; the rest are the same as those in Example 1.

[0156] Comparative Example 9

[0157] The difference between this comparative example and Example 1 is only that: the dosage of acrylamide is 40 parts; the rest are the same as those in Example 1.

[0158] Comparative Example 10

[0159] The difference between this comparative example and Example 1 is only that: when reinforcing the floor mudstone, in step (2), Component A and Component B are simultaneously spread in the floor mudstone magma in the hardening area, and the pneumatic stirrer is started to stir for 20 min (that is, the difference between this comparative example and Example 1 is only that Component A and Component B are added simultaneously); the rest are the same as those in Example 1.

[0160] Application Example

[0161] The floor mudstone reinforcement materials obtained from the examples and comparative examples were measured. Referring to the standard of GB / T50204-2015 "Code for Acceptance of Construction Quality of Concrete Structures", test blocks with dimensions of 40mm×40mm×160mm were made by uniformly mixing the hardened materials with argillized mudstone, cured in a standard curing laboratory, and their flexural strengths at 1h, 4h, 3d, and 28d were tested; referring to the standard of GB / T 1346-2011 "Test Methods for Water Requirement of Normal Consistency, Setting Time and Soundness of Cement", the setting time (initial setting time) of the slurry was measured; referring to the standard of GB / T 50476-2019 "Code for Durability Design of Concrete Structures", Φ50mm×100mm cylindrical test blocks were made from the hardened material paste, cured in a standard curing laboratory for 28d, and the maximum load and deformation at the failure of the test blocks were tested through axial compression. The larger the maximum deformation, the higher the toughness; the mudstone reinforcement test blocks were cured under standard conditions for 1d and divided into two batches. One batch was cured under standard conditions for 28d, and the other batch was cured completely immersed in water for 28d. The mechanical properties of the test blocks under the two curing environments were tested and compared and analyzed, and the strength loss of the test blocks in the immersion environment compared with that under standard curing was calculated; a drop of liquid was dropped on the solid surface, and the angle between the tangent of the contact point of the liquid drop and the solid surface and the solid surface was measured through image analysis to characterize the contact angle. The larger the contact angle, the stronger the water erosion resistance ability.

[0162] The results are shown in Table 1 below.

[0163] Table 1 Performance data of the floor mudstone reinforcement materials obtained from the examples and comparative examples

[0164]

[0165]

[0166] As can be seen from Table 1, adding acrylamide can significantly improve the flexural strength of the floor hardened material; the selection of sulfoaluminate cement in the composite cement can improve the early strength and setting time of the hardened material; the application of redox agents can significantly shorten the setting time of the material; the application of aluminate coupling agent increases the contact angle between the hardened floor and water, which can effectively enhance the water erosion resistance ability of the hardened material. The aluminate coupling agent has a high reaction activity in an alkaline environment (such as cement paste) and can quickly react with the hydroxyl groups on the surface of argillized mudstone and cement, and is more suitable for application in the floor mudstone reinforcement materials than other types of modifiers; in the present invention, by first adding material B containing aluminate coupling agent to the floor mudstone and uniformly mixing material B with the floor mudstone in advance, compared with the case of adding material A and material B simultaneously, it not only helps to improve the hydrophobicity of the floor mudstone, and then helps to better improve the water erosion resistance ability of the hardened material after reinforcement, but also minimizes the negative impact of the aluminate coupling agent on cement hydration to the greatest extent.

[0167] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rapid reinforcement material for floor mudstone, characterized in that, By mass parts, it includes: Material A: 40 - 60 parts of sulfoaluminate cement, 15 - 40 parts of portland cement, and 1 - 2 parts of naphthalene series water reducer, and also includes initiator, crosslinking agent, and redox agent; Material B: 80 - 100 parts of gypsum, 10 - 30 parts of acrylamide, and 2 - 4 parts of aluminate coupling agent.

2. The rapid reinforcement material for floor mudstone according to claim 1, characterized in that, The mass ratio of Material A to Material B is 1:

1.

3. The rapid reinforcement material for floor mudstone according to claim 1, characterized in that The initiator is ammonium persulfate, and the mass of the initiator is 0.5% - 2% of acrylamide; The crosslinking agent is N,N - methylenebisacrylamide, and the mass of the crosslinking agent is 0.5% - 2% of acrylamide; The redox agent is sodium bisulfite, and the mass of the redox agent is 0.5% of acrylamide.

4. The rapid reinforcement material for floor mudstone according to claim 1 or 2, characterized in that, The particle size of the rapid reinforcement material for floor mudstone < 20μm.

5. The rapid reinforcement material for floor mudstone according to claim 1, characterized in that, The components of the rapid reinforcement material for floor mudstone also include water, and the dosage of water is 50% - 70% of the sum of the masses of Material A and Material B.

6. A rapid reinforcement method for floor mudstone, characterized in that, Use the rapid reinforcement material for floor mudstone as described in any one of claims 1 - 5 for reinforcement.

7. The rapid reinforcement method for floor mudstone according to claim 6, characterized in that, It includes the following steps: (1) Add water to the floor mudstone and mix evenly to obtain a floor mudstone slurry; (2) Add Material B to the floor mudstone slurry and mix evenly to obtain a first slurry; (3) Add Material A to the first slurry and mix evenly to obtain a second slurry; (4) Level the second slurry and let it stand for hardening to achieve the reinforcement of the floor mudstone.

8. The rapid reinforcement method for floor mudstone according to claim 7, characterized in that The mass ratio of the rapid reinforcement material for floor mudstone to the floor mudstone is 1:2 - 1:

3.

9. The rapid reinforcement method for floor mudstone according to claim 7, characterized in that, In step (4), the hardening time is 10 - 20 min.

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