Impermeable anticorrosive mortar

Abstract

The invention belongs to the technical field of building materials, and particularly relates to anti-seepage and anti-corrosion mortar for deep sea. Aiming at the problems of accelerated crack propagation and short service life in a deep sea high-pressure and low-temperature environment caused by dependence on a physical dense barrier and lack of a dynamic repair mechanism in the prior art, the invention provides the double-layer structure mortar comprising a substrate layer and a surface layer. The base layer is made of cement, aggregate and functional additives, and the compactness and strength are remarkably improved through synergistic filling of nano materials; a Gallinstan microcapsule, a nano reinforcing material and a polymer emulsion are introduced into the surface layer on the basis of a substrate layer material, and dynamic self-repairing is realized by utilizing the characteristics that the microcapsule is broken and released at a crack and is oxidized to form a film. According to the design, a high-density barrier, chemical passivation and active repair are integrated, the impermeability and durability are remarkably improved, and the technical bottleneck of long-acting protection of deep-sea engineering is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a deep-sea anti-permeation and corrosion-resistant mortar. BACKGROUND

[0002] The current deep-sea corrosion-resistant mortar base layer design takes high compactness as the core target, and a typical ratio is, for example, high sulfate-resistant cement (100 parts), quartz sand (140-160 parts), silica fume (6-10 parts), etc., and the compressive strength is increased to 60-70 MPa and the chloride ion diffusion coefficient is controlled in 1.0-1.5*10 -12 m 2 / s through nano-pore filling. However, the technology has the following fundamental defects: Static protection limitation - the base layer completely relies on a physical compact barrier and has no active repair mechanism, and once cracks (such as crack width >0.1mm after 300 freeze-thaw cycles) are generated, the chloride ion permeation rate increases sharply by 200%, and the strength loss rate is as high as 10-15%; Repair technology blank - the existing technology only delays surface erosion through a surface layer of epoxy resin, has no repair means for internal cracks of the base layer, and has no precedent for realizing crack self-healing by using liquid metal microcapsules; Material system deficiency - traditional microcapsule technology is focused on polymer core materials (such as epoxy resin), and the modulus of the repair product (≤1GPa) is much lower than that of the cement matrix (≥3.5GPa), resulting in secondary cracking due to interface stress concentration.

[0003] Although the high-compactness base layer can delay corrosion in the short term, due to the lack of dynamic repair capability, the crack propagation rate is accelerated by 3 times under the coupling effect of deep-sea high pressure (>30MPa) and low temperature (2-4℃), resulting in a maintenance period of less than 5 years, which cannot meet the stringent requirement of 30-year service life for ultra-high pressure deep-sea engineering (such as 50MPa). SUMMARY

[0004] The core of the application is to solve the problem of insufficient long-term durability of deep-sea mortar products in the prior art.

[0005] The embodiment of the application provides a deep-sea anti-permeation and corrosion-resistant special mortar, which comprises a base layer and a surface layer, and wherein: The base layer comprises the following components in parts by mass: high sulfate-resistant cement 100 parts, quartz sand 140-160 parts, barite powder 45-55 parts, silica fume 6-10 parts, fly ash 15-25 parts, composite organic corrosion inhibitor 2-4 parts, nano-zinc oxide 0.5-1.5 parts, polycarboxylate superplasticizer 1.2-2.0 parts, and deionized water 35-45 parts; The surface layer comprises the following components by mass fraction: 100 parts of base layer dry material, 4-8 parts of Galinstan microcapsules, 1.5-3.0 parts of nano-silicon dioxide, 2-4 parts of epoxy resin emulsion, 0.2-0.5 parts of thixotropic agent.

[0006] Further, the Galinstan microcapsules are prepared by the following method: Galinstan alloy is mixed with liquid paraffin at a mass ratio of 1:3, sheared and emulsified at 2000-4000 r / min for 10 minutes to form 50-200 μm emulsion droplets; Urea-formaldehyde resin prepolymer with a molar ratio of urea to formaldehyde of 1:1.5 is added to the emulsion, and the coating is completed under the conditions of 70°C and pH=1.5-2.5 for 2-4 hours; After centrifugal washing and vacuum drying at 40°C, 50-300 μm particle size microcapsules are screened.

[0007] Further, the surface layer further comprises microbial induced particles 10-25 parts, and the MICPs comprise: Mg2Si-MCM-41 composite particles; sulfur-oxidizing bacteria loaded in sodium alginate microspheres; silane coupling agent KH-550 interface treatment agent.

[0008] Further, the surface layer is a double-layer structure: Intermediate transition layer: thickness 3-5 mm, containing 4 parts of Galinstan microcapsules with a particle size of 200-300 μm; Outer functional layer: thickness 2-3 mm, containing 8 parts of Galinstan microcapsules with a particle size of 50-100 μm, 20 parts of microbial induced particles, and 2.25 parts of nano-silicon dioxide.

[0009] Further, after the base layer is plastered or high-pressure spray formed, it is wet cured at 20-25°C and a humidity of ≥90% for 24-72 hours. The surface layer is sprayed using airless spraying equipment at a pressure of 15-20 MPa.

[0010] Further, when the surface layer is a double-layer structure, the intermediate transition layer is first sprayed at a pressure of 15 MPa, and after curing for 48 hours, the outer functional layer is sprayed at a pressure of 20 MPa.

[0011] The beneficial effects of the present application are embodied in the construction of a "high-density barrier-chemical passivation-dynamic repair" triple synergistic protection system, which fundamentally solves the problem of accelerated crack propagation and insufficient service life of traditional mortar due to the failure of static protection mechanism in deep-sea high-pressure low-temperature environment. Through the synergistic filling effect of the base layer nanomaterials (silica fume, nano zinc oxide), the porosity is significantly reduced to 10-12% (traditional technology is 18-20%), the compressive strength is increased to 75MPa, the chloride ion diffusion coefficient is reduced, and a dense physical barrier is formed. The Galinstan microcapsule introduced in the surface layer is broken at the crack, and the released liquid metal is oxidized to form a GaO(OH) / In2O3 composite film, which has a modulus (3.5GPa) that perfectly matches the cement matrix, avoiding the secondary cracking caused by interfacial stress concentration, and at the same time blocking the ion migration path, reducing the chloride ion permeability by 85%. Further integration of microbially induced particles (MICPs) uses the erosion factors (such as SO4 2-

[0012] Through the double-layer surface layer structure, hierarchical response and failure protection are realized: the intermediate transition layer (3-5mm) contains large-diameter microcapsules (200-300μm) as a macroscopic crack (>0.2mm) repair reserve, reducing the risk of interfacial peeling; the outer functional layer (2-3mm) contains small-diameter microcapsules (50-100μm) to quickly respond to microcracks (>0.05mm), and MICPs and nanosilica to compress the surface porosity to below 10%. The unique layered strategy (MICPs are only distributed in the outer layer) avoids the interlayer strength degradation caused by the expansion stress of ettringite, and the conductive network (resistance <10Ω·cm) formed by the oxidation of Galinstan can also realize real-time corrosion monitoring. In a simulated 1000-meter deep-sea environment (30MPa, 5℃), this system significantly reduces the chloride ion diffusion coefficient, with a strength loss rate of only 6.3% after 300 freeze-thaw cycles, and a 30MPa high-pressure penetration depth of 3.5mm, extending the maintenance period from less than 5 years to more than 30 years. The flexible ratio gives significant engineering adaptability - the lower limit ratio (microcapsule 4 parts) reduces the cost by 15% while still meeting basic protection, the upper limit ratio (microcapsule 8 parts) improves performance by 200% in extreme environments, and the intermediate value ratio achieves the optimal cost performance, providing a breakthrough protection solution for deep-sea engineering that combines breakthrough protection performance and construction feasibility. DETAILED DESCRIPTION

[0013] ​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0014] Example 1: Constructing a triple anti-corrosion system of "high density, multiple barriers, and self-healing". The substrate layer is designed to synergistically fill micropores with nanomaterials (silica fume and nano-ZnO), compressing the pore size from 0.1 μm to 0.05 μm. Combined with a strict water-cement ratio control of 0.3-0.4, this significantly improves density and compressive strength (60-75 MPa). The surface layer constructs a multi-level barrier system: the nanoscale barrier is achieved by blocking capillary pores with nano-SiO2, while the microscale barrier is formed by a metal passivation layer through Galinstan microcapsules. Both work together to block the migration of corrosive media. When cracks occur, the Galinstan microcapsules rupture, releasing liquid metal, which oxidizes to form a GaO(OH) / In2O3 composite film, achieving self-healing of the cracks. This design integrates a high-density substrate, multi-scale barriers, and dynamic self-healing, forming a long-term, closed-loop protection system for deep-sea applications. 1. Base layer mortar mix ratio

[0015] 2. Surface mortar mix ratio

[0016] 3. Galinstan microcapsule formulation

[0017] Preparation process steps Step 1: Preparation of base layer mortar First, dry mixing is performed: high sulfate-resistant cement, quartz sand, barite powder, silica fume, and fly ash are added to a dry powder mixer according to the specified ratio and dry-mixed at a constant speed for 3-5 minutes to ensure uniform dispersion of each component. Next, a solution phase is prepared by mixing composite organic preservative, nano-zinc oxide, polycarboxylate superplasticizer, and deionized water in the specified ratio. This solution is then treated with an ultrasonic disperser for 10-20 minutes to form a slurry with uniformly suspended nanoparticles. Finally, the dry mix and solution are added together to a forced mixer and stirred for 5-8 minutes. The mortar fluidity is then tested using a slump tester, controlling the slump value to be within the range of 160-180 mm to meet the requirements for spraying or plastering.

[0018] Step 2: Surface Mortar Construction First, the dry base material, Galinstan microcapsules (particle size 50-300 μm), and nano-silica are premixed in a planetary mixer according to the specified ratio. Then, epoxy resin emulsion (2-4 parts by weight) and thixotropic agent (bentonite, 0.2-0.5 parts by weight) are added and stirred continuously at 50-80 rpm for 2-4 minutes to form a uniform and stable slurry. During layered construction, after the base layer is formed by plastering or high-pressure spraying, it is wet-cured for 24-72 hours at 20-25℃ and relative humidity ≥90% to develop early strength. After curing, the surface mortar is sprayed onto the base surface with an airless spraying device at a pressure of 15-20MPa, controlling the thickness of each spray to 3-15mm. The thickness uniformity is monitored in real time using a laser thickness gauge to ensure a tight bond between the surface layer and the base layer.

[0019] Galinstan microcapsule preparation In the emulsification stage, liquid Galinstan alloy and liquid paraffin were mixed at a mass ratio of 1:3 and placed in a high-speed shear emulsifier at a rotation speed of 2000-4000 r / min for 10 minutes to form a uniform emulsion with a particle size distribution in the range of 50-200 μm. Subsequently, an interfacial polymerization reaction was carried out: a prepolymer solution prepared by urea and formaldehyde at a molar ratio of 1:1.5 was slowly added to the above emulsion. The reaction system temperature was controlled at 70℃, and the reaction was continuously stirred for 2-4 hours under acidic conditions of pH=2.0±0.2, allowing the urea-formaldehyde resin to complete the condensation coating on the surface of the Galinstan droplets. After the reaction, post-treatment was performed. The product was centrifuged and washed three times sequentially with acetone, ethanol, and deionized water to remove unreacted monomers and impurities. The resulting microcapsules were then dried in a vacuum drying oven at 40℃ for 12 hours. Finally, particles with a target particle size of 50-300 μm were screened using a vibrating sieve for use in mortar admixture.

[0020] Base layer ratio gradient verification

[0021] The performance of the substrate is optimized with the increase of silica fume (pore filling) and water-reducing agent (density improvement), but the upper limit of slump may affect the stability of spraying.

[0022] The intermediate mix ratio (in bold) serves as the benchmark for subsequent surface layer experiments. Its balanced performance (value range, compressive strength 65-75 MPa, Cl) - Diffusion 0.8-1.2×10 -12 m 2 ( / s) is optimal.

[0023] Validation of surface layer ratio gradient (based on intermediate values ​​of the base layer)

[0024] Synergistic effect of Galinstan microcapsules and nano-SiO2: • The lower limit group of microcapsules was insufficient (4 parts), resulting in lower self-healing efficiency (85%), but the best construction fluidity; • Upper limit group microcapsules 8 parts + nano SiO2 3 parts Cl - The diffusion coefficient decreased to 2.5 × 10⁻⁶. -13 m 2 / s, with a self-healing efficiency of 98%, but an increase in the amount of thixotropic agent may affect the uniformity of the slurry.

[0025] The intermediate value group is the best overall: compressive strength 72-75 MPa, Cl - It balances barrier and self-healing efficiency, and its slump of 170-175mm is suitable for spraying processes.

[0026] Microscopic Mechanism and Performance Improvement Analysis The core of this system's performance enhancement lies in its triple synergistic mechanism: In terms of physical barriers, nano-SiO2 reduces porosity to 10-12% by filling the pores of cement stone (reducing pore size from 0.1μm to 0.05μm), significantly improving density; in chemical passivation, the Galinstan oxide film (GaO(OH) / In2O3 complex) blocks the migration path of chloride ions (permeability ↓85%), while the epoxy resin hydrophobic film (contact angle >110°) isolates water molecule erosion; dynamic repair relies on the immediate release of low-viscosity Galinstan (2.4mPa·s, flow >5mm in 1h) from microcapsules, whose oxidation reaction (4Ga + 3O2 → 2Ga2O3 → 2GaO(OH)) generates an 18% volume expansion that tightly fills the cracks, and the GaO(OH) gel modulus (3.5GPa) matches the cement matrix, avoiding stress concentration. Furthermore, secondary hydration of silica fume strengthens the interfacial transition zone (ITZ), while the conductive network formed by Galinstan and the oxide passivation film synergistically enhance the electrochemical impedance (10). 4 →10 5 Ω·cm 2 ).

[0027] This design achieves increased compressive strength (65→75MPa) and chloride ion barrier (diffusion coefficient 10) through a cascade of "nanofilling-oxidation blocking-flow repair". -12 →10 -13 m 2Breakthrough improvements in microcapsules (95% @ 0.3mm) and crack self-healing (95% @ 0.3mm). The flexibility in formulation provides significant engineering value: the lower limit formulation (4 parts microcapsules + 1.5 parts nano-SiO2) reduces material costs by 15% while meeting basic protection requirements; the upper limit formulation (8 parts microcapsules + 3 parts nano-SiO2) improves corrosion resistance by 200% in extreme environments; and the intermediate value formulation (6 parts microcapsules + 2.25 parts nano-SiO2) achieves optimal cost-effectiveness, providing a reliable solution for 30-year long-term protection in deep-sea engineering.

[0028] The topcoat can be designed with two layers: an intermediate layer that directly contacts the base layer, containing large-sized microcapsules in a small quantity, and an outer layer containing small-sized microcapsules in a large quantity. The outer layer contains microbial-inducing particles, while the intermediate layer forms a transition zone, improving overall durability.

[0029] Example 2 Because the deep-sea environment is variable, and the pressure, temperature, and microbial environment of the system are uncertain, if the hardened mortar surface is subjected to slow erosion such as water flow impact, surface high pressure, and seawater erosion after long-term use, microcapsule release may fail.

[0030] In addition, the microcapsule shell may fail under seawater erosion, causing the internal liquid metal to be released prematurely and unable to respond and release when cracks occur, resulting in failure of repair and enhancement.

[0031] Therefore, if the negative effects of the ocean can be utilized to force the capsule to rupture within its shelf life, a secondary reinforcement can be achieved.

[0032] By triggering microbial mineralization through the hydrolysis of magnesium silicide to produce hydrogen, a three-level synergistic repair mechanism of "chemical-biological-mechanical" is formed with pressure-responsive microcapsules to solve the problem of repair failure under long-term deep-sea erosion.

[0033] Microbial-induced particles (MICPs)

[0034] The core principle of incorporating sulfur-oxidizing bacteria (Thiobacillus thioparus) into deep-sea anti-corrosion mortar lies in utilizing its chemoautotrophic metabolic characteristics to react hydrogen (H2) generated from the hydrolysis of Mg2Si with sulfate (SO4) ions from seawater. 2- This transforms into a targeted biomineralization driving force, enabling precise repair and long-term protection of cracks.

[0035] The bacterial community colonized the inside of the crack, bringing S 2- In-situ oxidation to SO4 2-It reacts with aluminates in cement to form ettringite (3CaO·Al2O3·3CaSO4·32H2O), and its 120% volume expansion applies a directional pressure of ≥5MPa, closing the cracks while activating the adjacent Galinstan microcapsules.

[0036] SO4 in seawater 2- (Erosion factor) and H2O (permeation carrier) are transformed into ettringite ore-forming raw materials, realizing "treating damage with harm".

[0037] Adding 10-20 parts by weight of surface layer and 100 parts by weight of surface layer mortar to the surface layer can effectively induce cracks, forcing self-healing to be completed within a controllable time.

[0038] Preparation method of microbial inducible particles (MICPs): First, the surface of the Mg2Si-MCM-41 composite particles was modified: 0.1% of the composite particle mass of silane coupling agent (KH-550) was dissolved in 5wt% anhydrous ethanol solution, and sprayed evenly on the particle surface. The particles were then dried at 60℃ for 2 hours to enhance the interfacial bonding force. Subsequently, sulfur-oxidizing bacteria-loaded microspheres were prepared: Thiobacillus thioparus was cultured in a thiosulfate-containing medium (pH=7.0) at 30°C with shaking for 48 hours until OD reached [value missing]. 600 ≥1.0, after centrifugation and concentration of bacterial sludge, it is mixed with 4wt% sodium alginate solution at a mass ratio of 1:20, and 2wt% calcium chloride solution is added dropwise to form 1-2mm gel microspheres. After solidification for 30 minutes, it is rinsed with sterile seawater. Next, the microspheres were activated and composited: the sodium alginate microspheres were immersed in sterile artificial seawater with a salinity of 3.5% for 12 hours (the survival rate of the bacterial community is >90%), and then put into a low-speed mixer (50 rpm) at a mass ratio of sodium alginate microspheres: Mg2Si@MCM-41 = 100:30. Sterile seawater of 5% of the total weight of the microspheres was sprayed in and stirred for 10 minutes to make the composite particles evenly attached. Finally, low-temperature drying and sieving: air-dry at 30℃ until the moisture content is ≤5%, screen for 1-2mm target particles by vibrating sieve, and store in a sealed, light-proof container at 4℃.

[0039] The preparation process of Mg2Si-MCM-41 composite particles, wherein MCM-41 is a commercially available finished product.

[0040] First, the MCM-41 particles (pore size 2-3 nm) were hydrophobically modified by immersion in a 5 wt% octadecyltrimethoxysilane (OTS) toluene solution under reflux at 80°C for 6 hours to achieve a surface contact angle >120°. Then, they underwent further hydrophobic modification. -3Degassing was performed at 200°C under vacuum for 4 hours; subsequently, a magnesium-silicon precursor solution was prepared (Mg(THF)₂ and silane were dissolved in anhydrous THF at a molar ratio of Mg:Si = 2:1), the modified particles were immersed in the solution and vacuumed to 100°C. -3 Pa was maintained for 2 hours to achieve over 90% pore filling; then in-situ reduction was performed: the temperature was increased to 500℃ at 2℃ / min and held for 4 hours in a 20% H2 / Ar atmosphere (the precursor was reduced to Mg / Si nanoclusters), and then increased to 650℃ and held for 2 hours to form 5-10nm Mg2Si grains; finally, the 10nm thick Mg3(PO4)2 passivation film was formed by impregnation with 0.5M ammonium dihydrogen phosphate solution, passed through a 200-mesh sieve and stored in vacuum at 60℃, and activated with argon gas at 300℃ for 1 hour before use.

[0041] Experimental Results Data Table

[0042] Experimental methods 1. Specimen preparation: Base layer: Fixed intermediate ratio (100 parts cement + 150 parts quartz sand + 50 parts barite powder + 8 parts silica fume + 20 parts fly ash + 40 parts water), molded into 40×40×160mm prisms, standard curing for 28 days.

[0043] Topcoat: Spray a topcoat mortar (100 parts dry base material + 3 parts epoxy resin + 0.35 parts thixotropic agent + 6 parts Galinstan microcapsules + 2.25 parts nano SiO2) onto the base layer surface, with variable addition of MICPs (10 / 15 / 20 / 25 parts), controlling the thickness to 2mm.

[0044] 2. Simulate deep-sea environment: Solution: 3.5% NaCl + 0.3% Na2SO4 (simulating the ionic composition of seawater); Conditions: Temperature 5℃ (±1℃), pressure 10MPa (simulating 1000m water depth), flow velocity 0.2m / s (simulating ocean current), cycle 90 days.

[0045] 3. Performance testing methods: Chloride ion permeation: 90-day charge throughput tested according to ASTM C1202, converted to diffusion coefficient (×10). -12 m 2 / s); Etnacite formation amount: Take the surface powder sample and calculate the ettringite phase content (wt%) by XRD quantitative analysis (Rietveld refinement). Compressive strength loss rate: Compare the strength before and after immersion (GB / T 17671) and calculate the loss rate (%).

[0046] The surface layer employs a dual-layer design consisting of an intermediate transition layer and an outer functional layer, with a total thickness controlled between 5 and 8 mm. The intermediate transition layer, 3 to 5 mm thick, is in direct contact with the substrate layer and incorporates large-particle Galinstan microcapsules (particle size range 200 to 300 micrometers, 4 parts). These microcapsules possess a thick shell structure of 5 to 8 micrometers, effectively resisting construction damage and serving as a repair reservoir for macroscopic cracks (width greater than 0.2 mm). Simultaneously, this layer creates a porosity gradient, transitioning from 18% in the substrate layer to 15%, significantly suppressing the risk of interfacial delamination. The outer functional layer, 2 to 3 mm thick, is exposed to the corrosive environment and incorporates small-particle microcapsules (particle size range 50 to 100 micrometers, 8 parts) and microbial-induced particles (MICPs, 20 parts). Small-diameter microcapsules can quickly respond to microcracks with a width greater than 0.05 mm, while MICPs drive the formation of ettringite to achieve long-term repair. Combined with nano silica (added in 2.25 parts), the surface porosity is compressed to below 10%.

[0047] The repair process achieves a tiered response: firstly, the outer layer of small-diameter microcapsules immediately seals microcracks; subsequently, MICPs generate ettringite, whose expansion pressure reaches over 5 MPa, effectively closing the cracks; when the crack penetrates to the intermediate layer, large-diameter microcapsules are activated for deep repair. The failure prevention design incorporates two key strategies: first, MICPs are distributed only in the outer layer to avoid interlayer delamination caused by ettringite expansion stress (experimental data shows that adding MICPs to the transition layer leads to a 40% decrease in interfacial strength); second, the exposed Galinstan after outer layer degradation oxidizes to form a GaO(OH) / In2O3 conductive film (resistance less than 10 ohm·cm), enabling real-time monitoring and early warning of corrosion current.

[0048] In comparative tests simulating a 1000-meter deep-sea environment (pressure 30 MPa, temperature 5 degrees Celsius), the double-layer structure achieved a comprehensive performance leap compared to the single-layer structure: the chloride ion diffusion coefficient decreased to 0.29 ± 0.04 × 10⁻⁶. -12 The permeability was reduced by 52% to square meters per second; after 300 freeze-thaw cycles, the strength loss rate was only 6.3%, a decrease of 51 percentage points; and the penetration depth was reduced to 3.5 mm under 30 MPa high pressure, a decrease of 57%. These improvements are mainly due to the synergistic effect of the outer dense barrier effect and the cascade repair mechanism.

[0049] The construction process is carried out in three stages: after 24 hours of curing of the base layer, an intermediate transition layer is sprayed at a pressure of 15 MPa, with a thickness controlled at 3 to 5 mm; followed by 48 hours of wet curing; and finally, an outer functional layer is sprayed at a pressure of 20 MPa, with a thickness controlled at 2 to 3 mm. Microcapsules are used according to particle size classification: large-diameter capsules (200 to 300 micrometers) are obtained through airflow sorting technology, while small-diameter capsules (50 to 100 micrometers) are prepared using centrifugal sorting. Interlayer reinforcement is achieved by spraying 0.1% by mass of silane coupling agent during the initial setting stage of the intermediate layer, ensuring an interlayer bond strength of not less than 4.5 MPa.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. 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 deep-sea anti-seepage and anti-corrosion mortar, characterized in that, Includes a base layer and a surface layer, wherein: The base layer comprises the following components in parts by weight: 100 parts high sulfate-resistant cement, 140-160 parts quartz sand, 45-55 parts barite powder, 6-10 parts silica fume, 15-25 parts fly ash, 2-4 parts composite organic corrosion inhibitor, 0.5-1.5 parts nano zinc oxide, 1.2-2.0 parts polycarboxylate superplasticizer, and 35-45 parts deionized water; The surface layer comprises the following components in parts by weight: The substrate consists of 100 parts dry base material, 4-8 parts Galinstan microcapsules, 1.5-3.0 parts nano silica, 2-4 parts epoxy resin emulsion, and 0.2-0.5 parts thixotropic agent.

2. The anti-corrosion mortar according to claim 1, characterized in that, The Galinstan microcapsules were prepared by the following method: Galinstan alloy and liquid paraffin were mixed at a mass ratio of 1:3 and sheared and emulsified at 2000-4000 r / min for 10 minutes to form emulsion droplets of 50-200 μm. Add urea-formaldehyde resin prepolymer with a urea:formaldehyde molar ratio of 1:1.5 to the emulsion and react for 2-4 hours at 70℃ and pH 1.5-2.5 to complete the coating. Microcapsules with a particle size of 50-300 μm were screened after centrifugation, washing, and vacuum drying at 40℃.

3. The deep-sea anti-seepage and anti-corrosion special mortar according to claim 1, characterized in that, The surface layer also contains 10-25 parts of microbial inducing particles, wherein the MICPs include: Mg2Si-MCM-41 composite particles; sulfur-oxidizing bacteria loaded in sodium alginate microspheres; and silane coupling agent KH-550 interface treatment agent.

4. The deep-sea anti-seepage and anti-corrosion special mortar according to claim 3, characterized in that, The surface layer has a double-layer structure: Intermediate transition layer: 3-5 mm thick, containing 4 parts of Galinstan microcapsules with a particle size of 200-300 μm; Outer functional layer: 2-3 mm thick, containing 8 parts of Galinstan microcapsules with a particle size of 50-100 μm, 20 parts of microbial inducing particles, and 2.25 parts of nano-silica.

5. The construction process of the deep-sea anti-seepage and anti-corrosion special mortar as described in any one of claims 1-4, characterized in that, After plastering or high-pressure spraying of the base layer, it should be wet-cured for 24-72 hours at 20-25℃ and humidity ≥90%. The topcoat is sprayed using airless spraying equipment at a pressure of 15-20 MPa.

6. The construction process of the deep-sea anti-seepage and anti-corrosion special mortar according to claim 5, characterized in that, When the surface layer has a double-layer structure, the intermediate transition layer is first sprayed at a pressure of 15MPa and cured for 48 hours; then the outer functional layer is sprayed at a pressure of 20MPa.

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