A floor mudstone rapid reinforcing material and reinforcing method

Abstract

The present application belongs to floor mudstone processing technical field, and concretely relates to a kind of floor mudstone rapid reinforcement material and reinforcement method.The floor mudstone rapid reinforcement material of the present application includes, by mass fraction:A material:40-60 parts of sulphoaluminate cement, 15-40 parts of Portland cement and 1-2 parts of naphthalene series water reducing agent, also includes initiator, crosslinking agent and oxidation-reduction agent;B material:80-100 parts of gypsum, 10-30 parts of acrylamide and 2-4 parts of aluminate ester coupling agent.The floor mudstone rapid reinforcement material of the present application can harden in situ the site mudification floor, form the floor hardening layer that meets the load bearing condition, reduce the artificial cost and time cost caused by cleaning floor mudification, guarantee the smoothness of traffic, speed up engineering progress, improve engineering benefit and economic benefit.

Description

Technical Field

[0001] This invention belongs to the field of mudstone treatment technology for foundation slabs, specifically relating to a rapid reinforcement material and method for mudstone foundation slabs. Background Technology

[0002] The geological structure of coal mines in central and western my country is relatively complex. The bedrock of the tunnel floor is mainly composed of weakly cemented mudstone, which has poor cementation, low strength, and is prone to mudification when exposed to water. During coal mining, stress concentration causes the fissures in the mudstone to expand and connect, making it easier for groundwater to seep into the rock and accelerating the mudification process of the floor rock. At the same time, tunneling activities disrupt the original groundwater seepage paths in the rock mass, causing a large amount of groundwater to accumulate at the tunnel floor. This prolonged contact with the floor rock promotes the cementation of clay minerals and other components in the floor rock. The tunneling process also requires a large amount of water to ensure the normal operation of the drill bit. After the tunnel is completed and exposed, the humidity and temperature conditions of the floor mudstone change due to the combined effects of ventilation and drainage. Poor drainage leads to the floor being submerged in groundwater for extended periods, further exacerbating the mudification process. Due to the aforementioned factors, severe mudification occurred on the floor of the tunnel, with mudification depths ranging from 20cm to 100cm, seriously affecting the normal production and safety of the coal mine.

[0003] The main methods used by major coal mines to deal with muddy floor slabs include: using loaders to transport the muddy floor material out of the roadway; laying scraper conveyors in the roadway to scrape the muddy material onto the conveyors and transport it out of the roadway; using high-pressure water guns to wash the muddy floor slab, breaking the muddy material into mud slurry, and then draining the mud slurry through ditches or drainage equipment; and manual excavation and cleaning using shovels and other tools. These methods generally suffer from high costs, low efficiency, and disruption to production schedules.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a rapid reinforcement material and method for bottom mudstone, which can help solve or improve at least one of the problems of high cost, low efficiency and impact on production schedule in the current treatment of bottom mudstone.

[0006] To achieve the above objectives, the present invention provides the following technical solution: 1. A rapid reinforcement material for mudstone foundation, comprising, by mass parts: A: 40-60 parts of sulfoaluminate cement, 15-40 parts of silicate cement and 1-2 parts of naphthalene-based water-reducing agent, and further comprising an initiator, a crosslinking agent and a redox agent; 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 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.

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

[0010] Preferably, the composition of the rapid reinforcement material for the mudstone base also includes water, and the amount 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 rapid reinforcement of mudstone foundation, which adopts the following technical solution: a method for rapid reinforcement of mudstone foundation, which uses the rapid reinforcement material for mudstone foundation as described above for reinforcement.

[0012] Preferably, the method includes the following steps: (1) adding water to the bottom mudstone and mixing it evenly to obtain a bottom mudstone slurry; (2) adding material B to the bottom 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 allowing it to harden by static standing to achieve the reinforcement of the bottom mudstone.

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

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

[0015] Beneficial effects:

[0016] (1) In view of the problems of high cost, low efficiency and impact on production progress in the current process of treating muddy bottom layers in major coal mines, the present invention provides a rapid mudstone reinforcement material for bottom layers. This rapid mudstone reinforcement material can harden the muddy bottom layer on site to form a hardened bottom layer that meets the load-bearing conditions, reduce the labor and time costs caused by cleaning muddy bottom materials, ensure smooth passage, speed up the project progress, and improve the project efficiency and economic benefits.

[0017] (2) The rapid reinforcement material for mudstone base plate of the present invention uses acrylamide to toughen and modify the reinforcement material. After the acrylamide polymerizes, it forms an interpenetrating network structure with the hydration products of cement-based materials, which effectively improves the shortcomings of poor bending performance and low toughness of cement-based materials, and increases the early strength, toughness and durability of hardened base plate.

[0018] (3) Aluminate coupling agent is used to modify the surface of the mudstone of the base plate and the hydration products of acrylamide polymerization and cement-based materials, so that the surface is changed from hydrophilic to hydrophobic, which can prevent water penetration and help improve the durability and water erosion resistance of the hardened base plate. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0020] Figure 1 A simulation diagram of the hydration products of a rapid reinforcement material for mudstone foundation provided in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the interaction between the aluminate coupling agent and the hydration products of the base mudstone and the reinforcing material, according to one embodiment of the present invention. Detailed Implementation

[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, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] The present invention will now be described in detail with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0024] This invention addresses at least one of the problems existing in the current process of treating mudstone layers on the roadway floor, namely, high cost, low efficiency, and impact on production progress, by providing a rapid reinforcement material for mudstone layers on the floor.

[0025] The rapid reinforcement material for mudstone foundation of this invention comprises, by weight parts: A: 40-60 parts of sulfoaluminate cement (e.g., 40, 45, 50, 55, or 60 parts), 15-40 parts of silicate cement (e.g., 15, 20, 25, 30, 35, or 40 parts), and 1-2 parts of naphthalene-based water-reducing agent (e.g., 1, 1.2, 1.4, 1.6, 1.8, or 2 parts), and also includes an initiator, a crosslinking agent, and a redox agent; B: 80-100 parts of gypsum (e.g., 80, 85, 90, 95, or 100 parts), 10-30 parts of acrylamide (e.g., 10, 15, 20, 25, or 30 parts), and 2-4 parts of aluminate coupling agent (e.g., 2, 2.5, 3, 3.5, or 4 parts). Both components A and B are solid (powdered materials) and are stored separately before being used to reinforce the mudstone base. If the proportion of sulfoaluminate cement in component A is too high, it will lead to severe strength reduction in the later stages of the reinforcement material; if the proportion of silicate cement is too high, it will prolong the setting time and reduce early strength; if the proportion of gypsum in component B is too high, it will cause the reinforcement material to set too quickly and generate excessive early heat release, easily causing cracking of the reinforced base; if the proportion of gypsum is too low, the setting time will be too slow, failing to meet reinforcement requirements; if the proportion of acrylamide is too high, it will reduce the mechanical properties of the reinforcement material; if the proportion of acrylamide is too low, the toughening effect on the reinforcement material will be insignificant; if the amount of aluminate coupling agent is too large, it will delay or hinder the hydration process of the reinforcement material, while if the amount is too small, the modification effect on the mudstone base and the hydration products of the material will be unsatisfactory.

[0026] In the rapid reinforcement material for mudstone foundations of this invention, acrylamide is selected to perform in-situ polymerization and toughening of the cementitious system, which helps to improve the overall toughness of the hardened foundation. In the presence of an initiator and crosslinking agent, acrylamide undergoes free radical polymerization through the exothermic reaction of cement hydration, forming polyacrylamide. At this point, the products in the stone body are cement hydration products and polyacrylamide. Since the polymerization reaction is also an exothermic process, it leads to an increase in the temperature of the reaction system, promoting cement hydration and thus forming an interpenetrating network structure (e.g., ettringite (AFt) and polyacrylamide (PAM) interwoven together) Figure 1 (As shown). In this invention, the aluminate coupling agent can improve the durability and water erosion resistance of the reinforced mudstone substrate; the aluminate coupling agent can adjust the surface contact angle between the mudstone substrate and water to improve the water erosion resistance of the mudstone substrate (mechanism of action is described in...). Figure 2Aluminate coupling agents are powdered materials, making them more suitable for application in the construction process. When aluminate coupling agents are used alone, the surface modification effect on the mudstone of the foundation plate does not reach the expected target because the ambient temperature does not reach the suitable working temperature (60-80℃) of the coupling agent. In the rapid reinforcement material for mudstone of the foundation plate of this invention, the selected sulfoaluminate cement, silicate cement and gypsum release a large amount of heat during the hydration process, which can provide a suitable 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 reinforcement material for mudstone foundation of the present invention, the mass ratio of material A to material B is 1:1.

[0028] In a preferred embodiment of the rapid reinforcement material for mudstone foundation of the present invention, the initiator is ammonium persulfate, and the mass of the initiator is 0.5%-2% (e.g., 0.5%, 1%, 1.5%, or 2%) of acrylamide; the crosslinking agent is N,N-methylenebisacrylamide (MBA), and the mass of the crosslinking agent is 0.5%-2% (e.g., 0.5%, 1%, 1.5%, or 2%) of acrylamide; the redox agent is sodium bisulfite, and the mass of the redox agent is 0.5% of acrylamide. The dosage of the initiator, crosslinking agent, and redox agent can also play a role in regulating the hardening time of the mudstone foundation.

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

[0030] In a preferred embodiment of the rapid reinforcement material for foundation mudstone of the present invention, the particle size of the rapid reinforcement material for foundation mudstone is <20μm, and the setting time (initial setting time) for mixing and reinforcement with foundation mudstone is 20-40 minutes. However, if the particle size of the foundation mudstone reinforcement material is too large, the reduced hydration level between materials will lead to a decrease in the strength of the hardened layer of the foundation.

[0031] In a preferred embodiment of the rapid reinforcement material for mudstone foundation of the present invention, the reinforcement material further includes water, and the amount of water is 50%-70% (e.g., 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 rapid reinforcement of mudstone foundation. The method for rapid reinforcement of mudstone foundation in the embodiments of the present invention is to use the rapid reinforcement material for mudstone foundation as described above for reinforcement.

[0033] In a preferred embodiment of the rapid reinforcement method for mudstone foundation of the present invention, the following steps are included: (1) adding water to the mudstone foundation and mixing it evenly to obtain a mudstone foundation slurry; (2) adding material B to the mudstone foundation 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 allowing it to harden by static standing, thereby achieving the reinforcement of the mudstone foundation. Specifically, by first mixing the mudstone foundation slurry with material B, the aluminate coupling agent in material B can modify the mudstone foundation, changing the surface of the mudstone foundation from hydrophilic to hydrophobic, thus helping the mudstone reinforced by the method of the present invention to have a better effect in preventing water penetration.

[0034] In a preferred embodiment of the rapid reinforcement method for foundation mudstone of the present invention, the mass ratio of the rapid reinforcement material to the foundation mudstone is 1:2-1:3 (e.g., 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 hardened layer will not contain foundation mudstone, resulting in a significant difference in composition from the main body of the hardened layer and causing surface cracking. If the amount of reinforcement material is too small, the foundation mudstone cannot be sufficiently hardened, leading to an unsatisfactory reinforcement effect.

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

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

[0037] Preferably, in step (2), the mixing time of the base mudstone slurry and material B is ≥10 min. If the mixing time is too short, the material B will not mix evenly with the base mudstone slurry, which will affect the reinforcement effect. Water can be added as appropriate during the mixing process to ensure uniform mixing of 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 hardened layer of the base plate will not mix evenly, which will cause cracking. The mixing time can be extended appropriately. Water can be added as appropriate during the mixing process to ensure uniform mixing of materials.

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

[0039] The following detailed description of the rapid reinforcement material and method for mudstone foundation of the present invention is provided through specific embodiments.

[0040] The main raw materials used in the following examples are: sulfoaluminate cement grade 72.5; silicate cement ordinary silicate cement grade PO 42.5; gypsum hemihydrate; initiator ammonium persulfate; crosslinking agent N,N-methylenebisacrylamide; redox agent sodium bisulfite; and aluminate coupling agent DL-411.

[0041] Example 1

[0042] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0044] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B (that is, when using the reinforcement material of this embodiment to reinforce the mudstone of the base plate, the mass of water is 60% of the sum of the mass of materials A and B).

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

[0047] (1) Based on the degree of mudification of the base plate, add an appropriate amount of water to dilute the mudified layer of the base plate to a suitable degree to obtain the mudstone magma of the base plate;

[0048] (2) Spread an appropriate amount of material B on the bottom mudstone slurry in the hardened area, and use a pneumatic mixer to mix material B and bottom mudstone slurry. Set the mixer speed to 300 r / min and the duration to 10 min. During the mixing process, add water as needed to ensure that the material is mixed evenly and the first slurry is obtained.

[0049] (3) After evenly spreading an appropriate amount of material A in the first slurry, turn on the pneumatic mixer to mix material A with the first slurry. The mixing time is controlled at 10 minutes and the mixer speed is set to 300 r / min. During the mixing process, water can be added as needed to ensure that the material is mixed evenly.

[0050] (4) After confirming that the hardening material and the mud base plate have been mixed evenly and the degree of mixing meets the requirements, use appropriate tools to flatten the surface of the hardened base plate so that the surface is smooth and flat. The local hardening is completed after 10-20 minutes.

[0051] The hardening process of the base plate adopts the unit area hardening method. After the hardening of one unit area is completed, the hardening work of the next unit area is carried out in the same area. The amount of rapid mudstone reinforcement material for the base plate in this embodiment is 100kg for a unit square meter area with a mudification depth of 20cm.

[0052] Example 2

[0053] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0054] Material A: 50 parts sulfoaluminate cement, 40 parts silicate cement, initiator (1.0% of acrylamide mass), crosslinking agent (1.0% of acrylamide mass), redox agent (0.5% of acrylamide mass), and naphthalene-based water-reducing agent (1.5 parts).

[0055] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0057] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0058] Example 3

[0059] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0061] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0063] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0064] Example 4

[0065] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0066] Material A: 60 parts of sulfoaluminate cement, 25 parts of silicate cement, 1.0% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5 parts of naphthalene-based water-reducing agent;

[0067] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0069] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0070] Example 5

[0071] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0072] Material A: 60 parts of sulfoaluminate cement, 15 parts of silicate cement, 1.0% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5 parts of naphthalene-based water-reducing agent;

[0073] Material B: 100 parts gypsum, 20 parts acrylamide, and 3 parts 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 materials A and B.

[0075] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0076] Example 6

[0077] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0078] Material A: 60 parts of sulfoaluminate cement, 40 parts of silicate cement, 0.5% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5% of the mass of naphthalene-based water-reducing agent;

[0079] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0081] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0082] Example 7

[0083] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0084] Material A: 60 parts sulfoaluminate cement, 40 parts silicate cement, initiator (2.0% of acrylamide mass), crosslinking agent (1.0% of acrylamide mass), redox agent (0.5% of acrylamide mass), and naphthalene-based water-reducing agent (1.5%).

[0085] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0087] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0088] Example 8

[0089] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0091] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

[0093] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0094] Example 9

[0095] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0097] Material B: 100 parts gypsum, 15 parts acrylamide, and 2 parts 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 materials A and B.

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

[0100] Example 10

[0101] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0103] Material B: 100 parts gypsum, 10 parts acrylamide, 2 parts 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 materials A and B.

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

[0106] Example 11

[0107] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

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

[0109] Material B: 100 parts gypsum, 30 parts acrylamide, and 2 parts 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 materials A and B.

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

[0112] Example 12

[0113] The rapid reinforcement material for mudstone foundation in this embodiment comprises, by weight, the following raw materials:

[0114] Material A: 60 parts of sulfoaluminate cement, 40 parts of silicate cement, 1.0% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5 parts of naphthalene-based water-reducing agent;

[0115] Material B: 100 parts gypsum, 15 parts acrylamide, and 3 parts 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 materials A and B.

[0117] The rapid reinforcement method for the mudstone base in this embodiment is the same as that in Embodiment 1.

[0118] Comparative Example 1

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

[0120] The mudstone reinforcement material for the foundation plate in this comparative example, by mass parts, comprises the following raw materials:

[0121] Material A: 60 parts sulfoaluminate cement, 40 parts silicate cement, 1.5 parts naphthalene-based water-reducing agent;

[0122] Material B: 100 parts gypsum, 2 parts 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 materials A and B.

[0124] The method for reinforcing the mudstone base 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: no acrylamide polymerization toughening was involved, and PP fiber was used for toughening.

[0127] The mudstone reinforcement material for the foundation of this comparative example, by mass parts, consists of the following raw materials: 60 parts of sulfoaluminate cement, 40 parts of silicate cement, 100 parts of gypsum, 1.5 parts of naphthalene-based water-reducing agent, 2 parts of PP fiber (3mm in length), 40 parts of water (tap water), and 2 parts of aluminate coupling agent.

[0128] The method for reinforcing the mudstone base 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 sulfoaluminate cement is replaced with aluminate cement.

[0131] The mudstone reinforcement material for the foundation plate in this comparative example, by mass parts, comprises the following raw materials:

[0132] Material A: 60 parts aluminate cement (CA-70), 40 parts silicate cement, 1.0% of acrylamide by mass of initiator, 1.0% of acrylamide by mass of crosslinking agent, 0.5% of acrylamide by mass of redox agent, and 1.5 parts naphthalene-based water-reducing agent;

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

[0134] 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 materials A and B.

[0135] The method for reinforcing the mudstone base 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 is that no surface modification treatment of the aluminate coupling agent was involved.

[0138] The mudstone reinforcement material for the foundation plate in this comparative example, by mass parts, comprises the following raw materials:

[0139] Material A: 60 parts of sulfoaluminate cement, 40 parts of silicate cement, 1.0% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5 parts of naphthalene-based water-reducing agent;

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

[0141] 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 materials A and B.

[0142] The method for reinforcing the mudstone base 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 is that the silane coupling agent KH570 is used instead of the aluminate coupling agent.

[0145] The mudstone reinforcement material for the foundation plate in this comparative example, by mass parts, comprises the following raw materials:

[0146] Material A: 60 parts of sulfoaluminate cement, 40 parts of silicate cement, 1.0% of the mass of acrylamide as initiator, 1.0% of the mass of acrylamide as crosslinking agent, 0.5% of the mass of acrylamide as redox agent, and 1.5 parts of naphthalene-based water-reducing agent;

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

[0148] 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 materials A and B.

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

[0150] Comparative Example 6

[0151] The only difference between this comparative example and Example 1 is that the amount of aluminate coupling agent used is 0.5 parts; all other aspects are the same as in Example 1.

[0152] Comparative Example 7

[0153] The only difference between this comparative example and Example 1 is that the amount of aluminate coupling agent used is 5 parts; all other aspects are the same as in Example 1.

[0154] Comparative Example 8

[0155] The only difference between this comparative example and Example 1 is that the amount of acrylamide used is 5 parts; all other aspects are the same as in Example 1.

[0156] Comparative Example 9

[0157] The only difference between this comparative example and Example 1 is that the amount of acrylamide used is 40 parts; all other aspects are the same as in Example 1.

[0158] Comparative Example 10

[0159] The only difference between this comparative example and Example 1 is that when reinforcing the bottom mudstone, in step (2), material A and material B are simultaneously spread in the bottom mudstone slurry in the hardened area, and the pneumatic mixer is started to stir for 20 minutes (that is, the only difference between this comparative example and Example 1 is that material A and material B are added at the same time); the rest are consistent with Example 1.

[0160] Application examples

[0161] The mudstone reinforcement materials for the base plate obtained in the examples and comparative examples were tested. Referring to GB / T50204-2015 "Code for Acceptance of Construction Quality of Concrete Structures", the hardened material was uniformly mixed with the mudstone and prepared into 40mm×40mm×160mm test blocks. These blocks were cured in a standard curing laboratory, and their flexural strength at 1h, 4h, 3d, and 28d was tested. Referring to GB / T 1346-2011 "Test Methods for Standard Consistency Water Requirement, Setting Time and Soundness of Cement", the setting time (initial setting time) of the grout was determined. Referring to GB / T... The standard 50476-2019, "Code for Durability Design of Concrete Structures," specifies the following methods: Φ50mm×100mm cylindrical test blocks are prepared from hardened cement paste and cured in a standard curing laboratory for 28 days. Axial compressive strength tests are used to measure the maximum load and deformation at failure; a larger maximum deformation indicates higher toughness. Mudstone-reinforced test blocks are cured for 1 day and divided into two batches: one batch is cured for 28 days under standard conditions, and the other is cured by complete immersion in water for 28 days. The mechanical properties of the test blocks under both curing conditions are tested and compared, and the strength loss of the test blocks under immersion conditions compared to standard curing is calculated. A drop of liquid is placed on a solid surface, and the angle between the tangent at the contact point between the droplet and the solid surface is measured using image analysis to characterize the contact angle; a larger contact angle indicates stronger resistance to water erosion.

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

[0163] Table 1 Performance data of mudstone reinforcement materials for the base plate obtained from the examples and comparative examples.

[0164]

[0165]

[0166] As shown in Table 1, the addition of acrylamide can significantly improve the flexural strength of the hardened base plate material; the selection of sulfoaluminate cement in 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 agents increases the contact angle between the hardened base plate and water, which can effectively enhance the water erosion resistance of the hardened material. Aluminate coupling agents have high reactivity in alkaline environments (such as cement paste) and can react rapidly with the hydroxyl groups on the surface of mudstone and cement, making them more suitable for use in mudstone reinforcement materials than other types of modifiers. This invention first adds component B containing aluminate coupling agent to the mudstone base plate, allowing component B to be mixed evenly with the mudstone base plate beforehand. Compared with the simultaneous addition of component A and component B, this not only helps to improve the hydrophobicity of the mudstone base plate, thus helping to better improve the water erosion resistance of the hardened material after reinforcement, but also minimizes the negative impact of aluminate coupling agents on cement hydration.

[0167] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid reinforcement material for mudstone foundation, characterized in that, By weight, it includes: Material A: 40-60 parts of sulfoaluminate cement, 15-40 parts of silicate cement, and 1-2 parts of naphthalene-based water-reducing agent, and also includes initiator, crosslinking agent and redox agent; Material B: 80-100 parts gypsum, 10-30 parts acrylamide, and 2-4 parts aluminate coupling agent; The mass ratio of material A to material B is 1:1; The mass ratio of the rapid reinforcement material for the base mudstone to the base mudstone is 1:2-1:

3.

2. The rapid reinforcement material for mudstone foundation as described in 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 the acrylamide. The oxidizing agent is sodium bisulfite, and the mass of the oxidizing agent is 0.5% of the acrylamide.

3. The rapid reinforcement material for mudstone foundation as described in claim 1 or 2, characterized in that, The particle size of the rapid reinforcement material for the mudstone base plate is <20 μm.

4. The rapid reinforcement material for mudstone foundation as described in claim 1, characterized in that, The composition of the rapid reinforcement material for the mudstone base also includes water, and the amount of water is 50%-70% of the sum of the mass of material A and material B.

5. A method for rapid reinforcement of mudstone foundation, characterized in that, The foundation mudstone rapid reinforcement material as described in any one of claims 1-4 is used for reinforcement.

6. The rapid reinforcement method for mudstone foundation as described in claim 5, characterized in that, Includes the following steps: (1) Add water to the bottom mudstone and mix evenly to obtain bottom mudstone slurry; (2) Add material B to the bottom mudstone slurry and mix evenly to obtain the first slurry; (3) Add material A to the first slurry and mix evenly to obtain the second slurry; (4) The second slurry is leveled and allowed to harden statically to achieve reinforcement of the mudstone base.

7. The rapid reinforcement method for mudstone foundation as described in claim 6, characterized in that, In step (4), the hardening time is 10-20 min.

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