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CN-122010510-A - Intelligent self-sensing self-repairing sleeve grouting material and preparation method and application method thereof

CN122010510ACN 122010510 ACN122010510 ACN 122010510ACN-122010510-A

Abstract

The invention belongs to the technical field of grouting materials, and particularly relates to an intelligent self-sensing self-repairing sleeve grouting material, and a preparation method and an application method thereof. The grouting material comprises, by weight, 100 parts of P.O52.5 silicate cement, 8-12 parts of sulphoaluminate cement, 15-25 parts of ultrafine slag powder, 8-12 parts of nano silica fume, 0.8-1.5 parts of carboxyl functional multi-wall carbon nanotubes, 0.3-0.6 part of graphene oxide hydrosol, 0.05-0.1 part of polyacrylamide dispersing agent, 8-12 parts of epoxy resin microcapsules, 3-5 parts of cyanoacrylate microcapsules, 0.01-0.05 parts of microbial spores, 0.5-1.0 part of microbial nutrient solution, 150-180 parts of 20-40 mesh quartz sand, 120-150 parts of 40-80 mesh quartz sand, 50-80 parts of 80-120 mesh quartz sand, and an additive system comprising 3.5-4.5 parts of polycarboxylate water reducer, 10-15 parts of UEA swelling agent, 1.2-2.0 parts of lithium carbonate early-strength retarder, 0.5-1.2 parts of sodium gluconate photocatalyst, 0.01-0.05-0.5 parts of nano TiO 2 , and 0.0-4.0.0.0 part of defoaming agent. The invention provides an intelligent self-sensing self-repairing sleeve grouting material, and a preparation method and an application method thereof.

Inventors

  • LI WEI
  • XIAO ZHENYANG
  • CUI GANG
  • YANG YUAN
  • CHEN XIAORUN
  • GAO CHANGLING
  • HE QINGQUAN
  • LI YUBING
  • WANG XUDONG
  • LIU TAO

Assignees

  • 中国五冶集团有限公司

Dates

Publication Date
20260512
Application Date
20260108

Claims (10)

  1. 1. An intelligent self-sensing self-repairing sleeve grouting material is characterized by comprising the following components in parts by weight: The basic cementing material system comprises 100 parts of P.O52.5 silicate cement, 8-12 parts of sulphoaluminate cement, 15-25 parts of superfine slag powder and 8-12 parts of nano silica fume; The intelligent perception component system comprises 0.8-1.5 parts of carboxyl functional multiwall carbon nanotubes, 0.3-0.6 parts of graphene oxide hydrosol and 0.05-0.1 parts of polyacrylamide dispersing agent; The self-repairing component system comprises 8-12 parts of epoxy resin microcapsule, 3-5 parts of cyanoacrylate microcapsule, 0.01-0.05 part of microbial spore and 0.5-1.0 part of microbial nutrient solution; The aggregate system comprises 150-180 parts of 20-40 mesh quartz sand, 120-150 parts of 40-80 mesh quartz sand and 50-80 parts of 80-120 mesh quartz sand; The additive system comprises 3.5 to 4.5 percent of polycarboxylate water reducer, 10 to 15 percent of UEA expanding agent, 1.2 to 2.0 percent of lithium carbonate early strength agent, 0.5 to 1.2 percent of sodium gluconate retarder, 0.3 to 0.6 percent of nano TiO 2 photocatalyst and 0.2 to 0.4 percent of organosilicon defoamer.
  2. 2. The intelligent self-sensing self-repairing sleeve grouting material according to claim 1, wherein the strength grade of the P.O52.5 Portland cement is 52.5, the specific surface area is 350-380m 2 /kg, the strength grade of the sulphoaluminate cement is 42.5, the content of C 3 A is more than or equal to 40%, the specific surface area of superfine slag powder is more than or equal to 500m 2 /kg, the activity index is more than or equal to 95%, the content of SiO 2 in nano silica fume is more than or equal to 96%, and the specific surface area is more than or equal to 20000m 2 /kg.
  3. 3. The intelligent self-sensing self-repairing sleeve grouting material is characterized by comprising 8-15nm of outer diameter, 5-20 mu m of length and 2-5% of carboxyl content of carboxyl functional multiwall carbon nanotubes, 0.8-1.2nm of thickness of a slice layer in graphene oxide hydrosol, 5mg/mL of concentration, 300-500 ten thousand of molecular weight of a polyacrylamide dispersing agent and 25-30% of hydrolysis degree.
  4. 4. The grouting material for the intelligent self-sensing self-repairing sleeve according to claim 1, wherein the particle size of the epoxy resin microcapsule is 80-150 mu m, the shell material is polyurea, the wall thickness is 2-5 mu m, the core material is epoxy resin E-51, the particle size of the cyanoacrylate microcapsule is 50-100 mu m, the shell material is gelatin-Arabic gum, the core material is alpha-ethyl cyanoacrylate, the microbial spore is bacillus, the survival rate is more than or equal to 85%, the size is 1-2 mu m, and the microbial nutrient solution is calcium lactate and yeast extract and is in a dry powder shape.
  5. 5. The intelligent self-sensing self-repairing sleeve grouting material is characterized in that the solid content of a polycarboxylate water reducer is 40%, the water reducing rate is more than or equal to 35%, the gas content is less than 3%, the 7d limiting expansion rate of a UEA expanding agent is more than or equal to 0.025%, the main component is calcium sulfoaluminate, the purity of Li 2 CO 3 in a lithium carbonate early strength agent is more than or equal to 99%, the particle size is less than 10 mu m, the purity of a sodium gluconate retarder is more than or equal to 98%, the retarding time is prolonged by 2-3 hours, the nano TiO 2 photocatalyst is anatase, the particle size is 20-30nm, the specific surface area is more than or equal to 150m 2 /kg, the organic silicon defoaming agent is polyether modified organic silicon, and the defoaming speed is less than 10s.
  6. 6. The grouting material for an intelligent self-sensing self-repairing sleeve of claim 1, further comprising an intelligent sensing system component, wherein the intelligent sensing system component comprises a flexible electrode sheet, an NFC passive chip and a strain sensitive RFID (radio frequency identification) tag, the flexible electrode sheet is embedded into the inner wall of the sleeve and is in close contact with the grouting material, the NFC chip acquires energy from an electromagnetic field emitted by a reader, and the RFID tag stores information comprising material batch, production date and formula number and can sense strain change.
  7. 7. The preparation method of the intelligent self-sensing self-repairing sleeve grouting material is used for preparing the intelligent self-sensing self-repairing sleeve grouting material according to claim 6, and is characterized by comprising the following steps: s1, nano material dispersion: Pre-dispersing, namely weighing 0.8-1.5 parts of carboxyl functional multiwall carbon nano tube, 0.3-0.6 part of graphene oxide hydrosol with the concentration of 5mg/mL, adding the carbon nano tube into a graphene oxide solution, primarily mechanically stirring for 10 minutes, adding 0.05-0.1 part of polyacrylamide dispersing agent, and continuously stirring for 5 minutes; Ultrasonic dispersion, namely transferring the mixed solution into ultrasonic dispersing equipment, wherein the ultrasonic power is 500-800W, the frequency is 20-25kHz, the dispersing time is 30 minutes, and the temperature is controlled at 25-35 ℃ in the ultrasonic process; high-shear stirring, namely, transferring the ultrasonic wave to a high-shear stirrer, wherein the shearing speed is 3000-5000rpm, and the stirring time is 2 hours, so as to obtain uniform and stable nano material dispersion liquid; The quality inspection comprises taking a small amount of dispersion liquid drop on filter paper, observing whether there is agglomerate, measuring Zeta potential, and observing dispersion uniformity with microscope; s2, preparing microcapsules: Preparing epoxy resin microcapsule, cyanoacrylate microcapsule, microbial spore; s3, preparing a dry blend: Mixing cementing material, namely weighing 100 parts of P.O52.5 cement, 8-12 parts of sulphoaluminate cement, 15-25 parts of superfine slag powder and 8-12 parts of nano silica fume according to the proportion, putting into a planetary mixer, and dry-mixing for 10 minutes at low speed, thereby ensuring uniform and consistent color; Adding aggregate, namely weighing quartz sand with three particle sizes according to the proportion, adding the quartz sand into a stirrer in batches, namely coarse sand, medium sand and fine sand, stirring for 3 minutes after each batch is added, and stirring for 15 minutes; adding 8-12 parts of epoxy resin microcapsule and 3-5 parts of cyanoacrylate microcapsule into the microcapsule, premixing the microcapsule with a small amount of fine sand, adding the microcapsule into a main mixer, and mixing the microcapsule and the cyanoacrylate microcapsule at a low speed for 5 minutes; adding microbial spore, wherein the spore powder is 0.01-0.05 part and the nutrient solution is 0.5-1.0 part, synchronously adding with the microcapsule, and uniformly mixing; The additive is added by weighing the polycarboxylate water reducer, the UEA expanding agent, the lithium carbonate, the sodium gluconate, the nano TiO 2 and the defoamer according to the proportion, mixing the liquid additive with the nano material dispersion liquid, mixing the powder additive with the main material, and continuously stirring for 10 minutes to ensure uniformity; the quality inspection and packaging steps comprise sampling, testing fluidity, air content and condensation time, packaging after being qualified, pasting RFID labels and inputting production information.
  8. 8. The method for preparing the intelligent self-sensing self-repairing sleeve grouting material according to claim 7, wherein the step S2 specifically comprises the following steps: S21, preparing an epoxy resin microcapsule: the emulsion is prepared by adding 40g of epoxy resin E-51 and 0.5g of isocyanate curing agent into 100mL of distilled water, 5g of polyvinyl alcohol and 0.5g of sodium dodecyl sulfate dropwise into the water phase, stirring at high speed to form O/W emulsion, wherein the particle size of oil drops is controlled to be 80-150 mu m; Wall material forming, namely slowly adding 8g of diethylenetriamine into the emulsion, wherein the reaction temperature is 50-60 ℃ and the reaction time is 2-3 hours, and the stirring speed is reduced to 500-800rpm to maintain the emulsion stable; The post-treatment comprises cooling to room temperature, filtering to collect microcapsule, repeatedly washing with deionized water and ethanol to remove surface residue, vacuum drying at 40-50deg.C for 12 hr, and microscopic examination to obtain powder with particle diameter of 80-150 μm and wall thickness of 2-5 μm with good sphericity; S22, preparation of cyanoacrylate microcapsules: Complex coacervation, namely dissolving 10g of gelatin in 150mL of water, stirring and dissolving at 50 ℃, adding 10g of Arabic gum, adjusting pH to 4.0-4.5, dripping 30g of ethyl alpha-cyanoacrylate, and stirring at high speed to form emulsion; wall material solidification, namely adding 3g glutaraldehyde dropwise to solidify gelatin-Arabic gum coacervate, wherein the reaction temperature is 40-45 ℃ and the reaction time is 3-4 hours, adjusting the pH value to 7.0-8.0, and stopping the reaction; Post-treatment, washing and drying the epoxy resin microcapsule, and microscopic examination, wherein the particle size is 50-100 mu m; S23, preparing microbial spores: culturing bacillus, inoculating bacillus in nutrient agar culture medium at 30deg.C for 72 hr to promote spore formation; spore collection, namely flushing the surface of a culture medium with sterile water, collecting spore suspension, centrifuging at 5000rpm for 10 minutes to remove nutrient cells and impurities, and repeatedly washing for 2-3 times; Spray drying, namely mixing the spore suspension with the nutrient solution, wherein the spray drying condition is that the air inlet temperature is 150-180 ℃ and the air outlet temperature is 80-90 ℃, and the spore-containing dry powder is obtained, and the spore survival rate is more than or equal to 85%.
  9. 9. The method for preparing the intelligent self-sensing self-repairing sleeve grouting material according to claim 7, further comprising the following steps: s4, integrating an intelligent sensing system: s41, embedding a flexible electrode sheet, namely reserving electrode grooves at symmetrical positions of the inner wall of a sleeve, cutting the flexible electrode sheet into proper sizes, adhering and fixing the flexible electrode sheet in the electrode grooves by using conductive adhesive, leading out a lead through a reserved hole of the sleeve wall, connecting the lead with an external measuring circuit, and coating thin epoxy resin on the surface of the electrode for protection so as to avoid damage during grouting; s42, NFC chip installation, wherein the NFC chip is fixed on the outer wall of the sleeve, and the position is selected at a position convenient to read; S43, binding an RFID label, namely sticking the strain sensitive RFID label on the surface of a sleeve or a concrete member, writing information such as a material batch number, a production date and validity period, a formula number, quality inspection data and manufacturer information into the label through an RFID writer, and establishing corresponding records in a cloud platform database S44, system testing, namely testing the resistance of the electrode plate before grouting, testing the function of the chip by using an NFC reader, reading tag information by using an RFID reader, and confirming that the data are accurate.
  10. 10. An application method of the intelligent self-sensing self-repairing sleeve grouting material, which is characterized by comprising the following steps of: The method comprises the following steps of Y1, preparing construction, namely checking whether a sleeve is clean or not, cleaning the end of a steel bar, removing greasy dirt and rust, preparing grouting equipment, namely a stirrer, a grouting pump or a grouting funnel, preparing monitoring equipment, namely a resistance measuring instrument, an NFC reader and a mobile terminal; Y2, material mixing, namely, dry mixing, namely, pouring water into a stirring barrel, adding the dry mixing, stirring at a low speed for 1 minute, stirring at a high speed for 5-8 minutes, observing fluidity in the stirring process, finely adjusting the water consumption if necessary, standing for 1-2 minutes after stirring is completed, and defoaming; The method comprises the steps of Y3, initial resistance measurement, connection of a resistance measuring instrument to an electrode lead, measurement and recording of initial resistance R0, uploading of data to a cloud platform and binding with the sleeve; Y4, grouting operation, namely adopting a bottom injection mode, pumping grouting, namely controlling the pressure to be 0.2-0.4MPa and the flow speed to be 50-100mL/s, and gravity grouting, namely naturally flowing the grouting funnel with the height of 1.5-2.0m from a grouting opening; In the grouting process, monitoring resistance change in real time, observing whether slurry overflows from the exhaust hole or not, and displaying grouting progress by the mobile terminal; The grouting process monitoring principle comprises that when grouting is not performed, an electrode almost has no conductive path and extremely high resistance, grouting is started, slurry contacts with a lower electrode, the resistance starts to decrease, grouting is performed, the slurry is gradually filled with a sleeve, the conductive path is increased, the resistance continuously decreases, grouting is completed, the slurry reaches an upper electrode, the resistance decreases to a stable minimum value, and a criterion is that when R decreases to 0.1R0 or reaches a preset threshold value and remains stable for more than 30 seconds, the grouting is judged to be full; Y6, confirming grouting completion, namely overflowing slurry from the exhaust hole, enabling the resistance to reach a stable minimum value, prompting completion of grouting by a system, and blocking a grouting opening and the exhaust hole; And Y7, curing and monitoring: standard curing conditions are that the temperature is 20+/-2 ℃ and the relative humidity is more than or equal to 95%; continuously monitoring, namely, the resistance changes along with hydration reaction, the NFC chip records a temperature and humidity curve, and the RFID tag senses whether abnormal strain exists or not; The data is automatically uploaded to a cloud platform to form a complete maintenance record; And Y8, monitoring the service period: after the structure is put into use, the resistance change, the temperature change and the strain accumulation are monitored periodically or in real time; When the following anomalies are detected, the system automatically gives an early warning of resistance mutation, strain exceeding a design value and temperature anomalies; and checking and disposing by maintainers according to the early warning information.

Description

Intelligent self-sensing self-repairing sleeve grouting material and preparation method and application method thereof Technical Field The invention belongs to the technical field of grouting materials, and particularly relates to an intelligent self-sensing self-repairing sleeve grouting material, and a preparation method and an application method thereof. Background The assembled building is widely popularized as an important development direction of building industrialization. The grouting connection technology of the steel bar sleeve is one of the most critical connection modes in the assembled concrete structure, and the connection quality directly influences the structural safety. The sleeve grouting material needs to have high fluidity, early strength, micro expansion, high strength and the like so as to ensure reliable connection between the steel bars and the sleeve. In recent years, with the expansion of the scale of assembly type buildings, the performance requirements of sleeve grouting materials are continuously improved, and particularly, higher requirements are put forward in the aspects of quality monitoring, durability guarantee, intelligent construction and the like. However, the traditional grouting material mainly focuses on mechanical properties and workability, and has obvious defects in aspects of intelligent perception, self-repairing, digital management and the like. 1. The problem that grouting quality cannot be monitored in real time: The traditional grouting material can not know the grouting fullness and compactness in the sleeve and whether the gap defect exists or not in real time in the grouting process and after solidification, so that the hidden danger of engineering quality is difficult to discover in time. Construction acceptance mainly depends on experience judgment and spot check, full detection cannot be achieved, and a quality control blind area exists. 2. Problem of unable continuous monitoring of service state: The grouting material bears various load actions in the whole life cycle of the building, but lacks effective means for monitoring the internal stress strain state of the grouting material, and potential structural safety risks cannot be pre-warned. Particularly, under extreme working conditions such as earthquake, wind load and the like, the stress state of the connecting node cannot be mastered in real time. 3. Problem of insufficient self-healing ability of microcracks: The grouting material is easy to generate micro cracks under the actions of shrinkage, temperature stress and load, and the problems of durability reduction, steel bar corrosion, strength loss and the like can be caused by the cracks. Once the traditional material is cracked, the traditional material can only be repaired or replaced passively, and lacks an active self-repairing function, so that the maintenance cost is high and the service life is influenced. 4. Problem of missing quality traceability system: during the whole process from material production, transportation and storage to site construction and maintenance, a complete data recording and tracing mechanism is lacked. Once quality problems occur, the problem links are difficult to quickly locate, responsibility is not clearly divided, and problem solving efficiency is affected. 5. The problem of low construction visualization degree: the grouting process belongs to a hidden project, a constructor cannot intuitively judge the flowing state and filling condition of grouting materials, and the grouting is not full and has the defects of bubbles and the like easily caused by empirical operation. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide an intelligent self-sensing self-repairing sleeve grouting material, and a preparation method and an application method thereof. The technical scheme adopted by the invention is as follows: an intelligent self-sensing self-repairing sleeve grouting material comprises the following components in parts by weight: The basic cementing material system comprises 100 parts of P.O52.5 silicate cement, 8-12 parts of sulphoaluminate cement, 15-25 parts of superfine slag powder and 8-12 parts of nano silica fume; The intelligent perception component system comprises 0.8-1.5 parts of carboxyl functional multiwall carbon nanotubes, 0.3-0.6 parts of graphene oxide hydrosol and 0.05-0.1 parts of polyacrylamide dispersing agent; The self-repairing component system comprises 8-12 parts of epoxy resin microcapsule, 3-5 parts of cyanoacrylate microcapsule, 0.01-0.05 part of microbial spore and 0.5-1.0 part of microbial nutrient solution; The aggregate system comprises 150-180 parts of 20-40 mesh quartz sand, 120-150 parts of 40-80 mesh quartz sand and 50-80 parts of 80-120 mesh quartz sand; The additive system comprises 3.5 to 4.5 percent of polycarboxylate water reducer, 10 to 15 percent of UEA expanding agent, 1.2 to 2.0 percent of lithium carbonate early