CN113582652B - Conductive quick-hardening repairing material and preparation method thereof - Google Patents

Conductive quick-hardening repairing material and preparation method thereof Download PDF

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CN113582652B
CN113582652B CN202110931859.4A CN202110931859A CN113582652B CN 113582652 B CN113582652 B CN 113582652B CN 202110931859 A CN202110931859 A CN 202110931859A CN 113582652 B CN113582652 B CN 113582652B
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colloid
conductive
powder
water
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CN113582652A (en
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黄小霞
孟建军
李强
孙聪
明玮
黄绍龙
沈凡
罗宵
卢吉
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Wuhan Ecological Environment Design And Research Institute Co ltd
Wuhan Municipal Construction Group Co Ltd
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Wuhan Ecological Environment Design And Research Institute Co ltd
Wuhan Municipal Construction Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/141—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72—Repairing or restoring existing buildings or building materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/90—Electrical properties
    • C04B2111/94—Electrically conducting materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a conductive quick-hardening repairing material, which comprises the following components in parts by weight: 400-600 parts of a cementing material, 600-700 parts of quartz sand, 50-100 parts of silicon powder, 50-100 parts of fly ash, 60-100 parts of gypsum, 120-160 parts of water, 10-20 parts of a water reducing agent, 5-10 parts of an expanding agent, 8-15 parts of a composite early strength setting accelerator and 30-45 parts of a high-viscosity conductive phase. The conductive quick-hardening repairing material has good environmental stability, expansibility and conductivity, and can show higher mechanical property after being demoulded for 2-3 hours; maintenance personnel can judge the damage degree and the replacement time more intuitively through the strength of the electric signal, the working efficiency and the safety factor are obviously improved, the sustainable development requirements of bridge construction and maintenance can be met, and the method has important economic and environmental benefits.

Description

Conductive quick-hardening repairing material and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a conductive quick-hardening repairing material and a preparation method thereof.
Background
The bridge construction of China enters a rapid development stage in the twenty-first century. In recent years, with the rapid development of national economy, the demands of people on living trips are continuously increased. The construction of the bridge in the four-way and eight-reach way promotes the development of the city, further improves the traveling conditions of people and promotes the connection among all areas of the city. At present, the bridge construction technology of China leaps ahead of the world, cement concrete is used as an important bulk building material and plays an irreplaceable role in the basic construction of China, and the cement concrete is widely applied to bridge construction by virtue of excellent performances such as high rigidity, strong bearing capacity, low cost and the like. However, due to the influence of factors such as the cement hardening characteristic of concrete, the specificity of construction environment and the like, the key positions of the bridge part show insufficient strength and increased shrinkage, and finally problems such as peeling, pitted surface, cracking and the like are generated; in addition, along with the load rolling of a large amount of overloaded vehicles for a long time, the difference of the internal stress and the external stress of the bridge deck is large, the bridge deck is easily damaged too early, and the service life of the bridge is greatly shortened. Meanwhile, the worker is difficult to judge the damage degree of the defect position accurately through the damaged surface intuitively, so that the situations of untimely maintenance or frequent maintenance, renovation and the like are caused, and further immeasurable social and economic losses are caused. Therefore, the repair of the damaged part of the bridge becomes a big problem for the social relevant departments.
In view of the above problems, there is an urgent need to develop a repair material which is fast hardened, has high strength and can quickly realize traffic so as to overcome the problems of premature occurrence or cracking caused by excessive vehicle load in the current bridge construction process. Currently, bridge deck repair materials can be broadly classified into the following categories: inorganic repairing materials, organic repairing materials and polymer modified repairing materials. The various types of repair materials have achieved considerable research results, but have certain disadvantages. The inorganic repairing material mainly takes graphite, carbon fiber, steel slag and other materials as conductive phases, wherein when the graphite is taken as the conductive phase of the traditional conductive material, the graphite is usually added once, so that obvious conductivity can be shown under the condition of large doping amount due to uneven dispersion; the carbon fiber has high cost and is difficult to disperse so as to influence the conductivity of the conductive material; meanwhile, the ettringite generated by the cementing material can further influence the improvement of early strength and electrical conductivity; the steel slag has very fine fineness requirement, and needs to be ground by utilizing high energy consumption, so that the cost is higher; the organic repairing material also has the defects of unstable conductivity and difficult control; most of the polymer modified repairing materials have the defects of poor water solubility, poor environmental stability and difficult control of electric conduction. Therefore, the problems of poor material performance, short service life and the like of the current bridge key parts are further improved, and the method has profound significance for the sustainable development of new bridges in the future.
Disclosure of Invention
The invention mainly aims to provide a conductive quick-hardening repairing material aiming at the defects in the prior art, which has good environmental stability, expansibility, conductivity and the like, and can show higher mechanical property after being demoulded for 2-3 h; can meet the sustainable development requirement of bridge construction and maintenance, and has important economic and environmental benefits.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a conductive quick-hardening repairing material comprises the following components in parts by weight: 400-600 parts of a cementing material, 600-700 parts of quartz sand, 50-100 parts of silicon powder, 50-100 parts of fly ash, 60-100 parts of gypsum, 120-160 parts of water, 10-20 parts of a water reducing agent, 5-10 parts of an expanding agent, 8-15 parts of a composite early strength setting accelerator and 30-45 parts of a high-viscosity conductive phase.
In the above scheme, the expanding agent is composed of CaO and Al2O3、Al(OH)3And CaSO4The composite material is compounded according to the mass ratio of (1) - (2) to (1) - (1.5), and all the materials are industrial reagents.
In the scheme, the mass ratio of particles corresponding to 40-80 meshes, 80-120 meshes and 120-160 meshes in the quartz sand is 1 (1-1.5) to 1.5-2.0.
In the scheme, the fly ash is secondary fly ash, and the specific surface area is 4900-5300 cm2The ignition loss is 6.9-8.4%.
In the above-mentioned scheme, the first and second light sources,the silicon powder is grey, and the specific surface area is 16890-18000 cm2G, apparent density of 2.25-2.3 g/cm3。
In the scheme, the gypsum is dihydrate gypsum, is grey white and has the density of 2.3-2.4 g/cm3And the ignition loss is 16.25-18.05%.
In the scheme, the water reducing agent is a polycarboxylate water reducing agent which is light yellow, and the water reducing rate is 28-30%.
In the scheme, the main phase of the cementing material is C2S、C3A and C12A7The kaolin, limestone, bauxite and Fe powder are taken as main raw materials, and mixing, primary grinding, drying and primary calcining are sequentially carried out; and then quenching the obtained primary calcined product to room temperature at the speed of 20-30 ℃/min, secondarily grinding the product to 350 meshes, and finally adding graphite and carrying out secondary calcination at low temperature to obtain the graphite.
In the scheme, the mass ratio of the kaolinite, the limestone, the bauxite, the Fe powder and the graphite is (25-40): 20-60): 10-20): 1-3.
In the scheme, the primary powder is ground to be below 200 meshes.
In the scheme, the drying temperature is 100-120 ℃, and the drying time is 2-3 h.
In the scheme, the primary calcination process comprises the following steps: firstly, heating to 700-900 ℃ and preserving heat for 20-30 min, and then continuously heating to 1400-1500 ℃ and preserving heat for 30-35 min.
In the scheme, the secondary calcination process comprises the following steps: and heating the mixture from room temperature to 200-300 ℃, preserving the heat for 20-30 min, and then naturally cooling the mixture to the room temperature.
In the scheme, the main mineral composition of the bauxite comprises gibbsite and diaspore, and the bauxite needs to be crushed to be less than 2.36mm before being calcined.
In the scheme, the conductivity of the high-viscosity conductive phase is 90-110S/cm and 790-1030 mPa & S; it comprises colloid A and colloid B; wherein the colloid A is compounded by 3-6 parts of water, 5-10 parts of expanding agent, 3-6 parts of graphite, 0.1-0.3 part of water glass and 0.0001-0.0002 part of hydroxymethyl cellulose ether, and has the conductivity of 90-120S/cm and the viscosity of 800-1000 mPa & S; the colloid B is prepared by mixing and boiling 2-5 parts of boiling water, 0.5-1.5 parts of uranium oxide, 0.5-1.5 parts of thorium oxide, 1-3 parts of zirconium oxide, 0.2-0.6 part of carbon powder and 0.2-0.5 part of Fe powder for 1-2 hours at about 100 ℃, and has the conductivity of 80-100S/cm and the viscosity of 820-1050 mPa & S.
The high-viscosity conductive phase consists of a colloid A and a colloid B, and has good fluidity and dispersibility; wherein, the colloid A is doped with an expanding agent and graphite, and the expanding agent has the function of compensating shrinkage and can reduce the cracking of the repairing material; according to the invention, the swelling agent is further introduced into the colloid A, so that compared with a traditional mode, the swelling agent can be uniformly dispersed in a conductive phase to promote rapid forming to form a high-strength repairing material, and the uniformly dispersed swelling agent can compensate excessive early self-shrinkage of a cementing material in time along with the reaction, so that the strength formation and the volume stability are ensured; in addition, the influence of the ettringite formed by the expanding agent on the early strength can be further improved under the graphite adsorption effect.
In the scheme, the composite early strength setting accelerator comprises the following components in parts by weight: 5-10 parts of triethanolamine, 8-10 parts of formic acid, 8-10 parts of sodium fluoride, 12-20 parts of aluminum sulfate, 2-6 parts of slaked lime and 15-20 parts of water.
The preparation method of the conductive quick-hardening repairing material comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight portion thereof comprise: 400-600 parts of a cementing material, 600-700 parts of quartz sand, 50-100 parts of silicon powder, 50-100 parts of fly ash, 60-100 parts of gypsum, 120-160 parts of water, 10-20 parts of a water reducing agent, 5-10 parts of an expanding agent, 8-15 parts of a composite early strength setting accelerator and 30-45 parts of a high-viscosity conductive phase;
2) mixing and stirring the cementing material, gypsum and fly ash uniformly; then adding silicon powder and quartz sand, and uniformly mixing to obtain mixed powder;
3) sequentially adding the colloid A and the colloid B in the high-viscosity conductive phase into water, and uniformly mixing to obtain a dispersion liquid;
4) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
5) and pouring, molding and curing the obtained mixture to obtain the conductive fast-hardening repairing material.
In the above scheme, the maintenance step adopts standard maintenance.
The repairing material provided by the invention is applied to a bridge instead of the traditional inorganic repairing material, has the advantages of higher strength, longer service life and the like, and meanwhile, due to the excellent conductivity of the repairing material, the frequency of renovation and maintenance can be effectively reduced, maintenance personnel can judge the damage degree and the replacement time more intuitively according to the strength of an electric signal, and the working efficiency and the safety factor are obviously improved; the repairing material can be put into use when a bridge is newly built, can make up for the defects of over-low strength of key parts and the like, and effectively reduces the problems of cracking, pitted surface and the like caused by excessive load on the bridge; the repairing material meets the requirements of the strategy of sustainable development of bridge construction and maintenance, and has considerable economic and energy-saving significance.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention uses the self-burning cementing material as the raw material of the conductive early-strength quick-hardening repairing material, has low cost and convenient production, and the mineral component of the material comprises C2S、C3A and C12A7In which C is3The early hydration rate is high, and the high early strength is ensured within 2-3 hours, so that the use requirement is met; at the same time due to C2S and C12A7Relatively slow hydration, and can prevent and inhibit factor C3A, the crack of the early-strength and quick-hardening conductive concrete structure is caused by too fast hydration, so that the problem of cracking caused by too large difference of internal and external stress generated by shrinkage is solved; by adding a small amount of graphite for low-temperature secondary calcination, the graphite is promoted to be uniformly filled among particles of the cementing material while the conductivity of the graphite is ensured, so that the obtained cementing material has certain conductivity, the conductivity stability of the obtained repairing material is further ensured, and meanwhile, the introduced graphite can adsorb generated ettringite (the introduced graphite absorbs ettringite in the hydration processAttached around the repair material, gradually consumed along with the enhancement of the volcanic ash effect of the fly ash along with the progress of hydration, thereby avoiding the influence of the ettringite on the early strength and synchronously ensuring the mechanical property and the electric conductivity of the obtained repair material; the coal ash is further combined, so that the problem of hydration heat concentration in the mineral hydration process can be effectively relieved, and the coal ash is energy-saving and environment-friendly in utilization and has a positive significance in realizing sustainable development of waste recycling;
2) the quick-setting admixture can greatly shorten the setting time, has the capability of quickly repairing bridges, avoids the problem of long-time difficulty in general maintenance, and has more efficient economic benefit; the accelerator disclosed by the invention has no alkali, so that the problem of strength reduction of a later-stage repairing material is not caused, triethanolamine can accelerate hydration of a cementing material, accelerate formation of C-S-H gel with a high calcium-silicon ratio, accelerate formation of diaspore and quickly convert the diaspore into a cubic crystal form, and meanwhile, the formation of a soluble complex reduces the concentration of calcium ions, and promotes the formation of the early strength of the repairing material to a certain extent;
3) the high-viscosity conductive phase adopted by the invention consists of the colloid A and the colloid B, and firstly has high viscosity, so that the quartz sand and the slurry are firmly bonded together in the cementing and hardening process of the conductive quick-hardening repairing material, and the strength is further improved; secondly, when the colloid A meets water, the ettringite generated by the reaction of the expanding agent can be attached between graphite layers, so that the influence of the ettringite on the strength development of hardened slurry is reduced; in addition, the self-made high-viscosity conductive phase has the characteristics of no toxicity, low synthesis cost and good environmental stability, and compared with the traditional method of preparing a repairing material by simply doping a conductive material, the conductive fast-hardening repairing material prepared by utilizing the conductive phase provided by the invention has the advantages that the resistivity can be as low as 15S/cm, the expansion effect is good, the performances such as cracking resistance and the like are more stable and durable, and the self-made high-viscosity conductive phase is completely suitable for severe environments such as strong acid and strong alkali resistance and the like;
4) the preparation method of the conductive quick-hardening repairing material is simple, environment-friendly, capable of being used for large-scale industrial production and has remarkable popularization and application values.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the following examples, the expanding agents used consisted of CaO and Al2O3、Al(OH)3And CaSO4The composite material is compounded according to the mass ratio of 1:1.2:1.5:1, and all the components are industrial reagents;
the adopted quartz sand is formed by mixing three materials of 40-80 meshes, 80-120 meshes and 120-160 meshes in a mass ratio of 1:1: 1.5;
the adopted fly ash is secondary fly ash, and the specific surface area is 5300cm2(iv)/g, loss on ignition 8.4%;
the adopted silicon powder is grey, and the specific surface area is 18000cm2G, apparent density 2.3g/cm3；
The gypsum adopted is dihydrate gypsum which is grey white and has the density of 2.3g/cm3Loss on ignition of 18.05%;
the adopted water reducing agent is a polycarboxylic acid water reducing agent which is light yellow, and the water reducing rate is 30%;
the adopted limestone is off-white powder with the density of 2.89g/cm3。
The bauxite is light green block, the main mineral composition includes gibbsite and monohydrate bauxite, before calcining, it must be firstly broken into 2.36mm below, and its density is 2.35g/cm3。
The water glass is colorless and transparent thick slurry solution, is blue and is an industrial reagent.
The adopted hydroxymethyl cellulose ether is white powder (the 100-mesh passing rate is more than 98.5 percent), plays a role of a suspension and a tackifier and is an industrial reagent.
The adopted uranium oxide, thorium oxide and zirconia are insoluble in water, acid and alkali, the purity is 98%, and the industrial reagent is from Wuhan Yongsheng scientific and technological limited company.
The adopted carbon powder is TN170 type carbon powder provided by Zhuhaixin Ying science and technology Limited company, has conductivity, and needs to be ground into 350-mesh powder before use.
The adopted Fe powder is gray black spherical, the granularity of the Fe powder is 0.5-10 microns, the purity of the Fe powder is more than 98%, and the Fe powder is used by American water purification material Co.
The purity of the triethanolamine, the formic acid, the sodium fluoride and the aluminum sulfate is 98 percent, and the industrial reagent is adopted.
The used hydrated lime is powdered and an industrial reagent.
Example 1
A conductive quick-hardening repairing material comprises the following components in parts by weight: 400 parts of a cementing material, 600 parts of quartz sand, 50 parts of silicon powder, 50 parts of fly ash, 60 parts of gypsum, 140 parts of water, 10 parts of a water reducing agent, 5 parts of an expanding agent, 8 parts of a composite early strength setting accelerator and 35 parts of a high-viscosity conductive phase;
the preparation method of the cementing material comprises the following steps: fully and uniformly mixing 27 parts of kaolinite, 30 parts of limestone, 30 parts of bauxite and 10 parts of Fe powder, and grinding the mixture to be less than 200 meshes to obtain a raw material; placing the obtained raw material in an electric heating constant temperature blast drying oven at 120 ℃ for drying for 2 h; transferring the dried mixture to a high-temperature furnace, firstly heating to 900 ℃, preserving heat for 25min, and then continuously heating to 1400 ℃, preserving heat for 30 min; after calcining and sintering, cooling the primary calcined product to room temperature at the speed of 20 ℃/min, grinding the product to 350 meshes, then adding 3 parts of graphite, carrying out secondary calcining at the temperature of 200 ℃, and preserving heat for 20min to obtain the cementing material with the characteristics of early strength and rapid hardening;
the high-viscosity conductive phase consists of a colloid A and a colloid B, wherein the colloid A is obtained by uniformly stirring 3 parts of water, 5 parts of an expanding agent, 3 parts of graphite, 0.1 part of water glass and 0.0001 part of hydroxymethyl cellulose ether under the stirring condition of 200r/min, the conductivity is 97S/cm, and the viscosity is 950mPa & S; colloid B was obtained by adding 0.5 part of uranium oxide, 0.5 part of thorium oxide, 1 part of zirconium oxide, 0.2 part of carbon powder and 0.2 part of Fe powder to 2 parts of boiled distilled water, followed by further boiling at 100 ℃ for 1 hour, and had an electric conductivity of 89S/cm and a viscosity of 899 mPas;
the composite early strength accelerating agent is prepared by uniformly mixing 5 parts of triethanolamine, 8 parts of formic acid, 8 parts of sodium fluoride, 12 parts of aluminum sulfate and 2 parts of slaked lime, adding 15 parts of water, and continuously and uniformly stirring;
the preparation method of the conductive quick-hardening repair material comprises the following steps:
1) mixing and stirring the weighed cementing material with gypsum and fly ash uniformly; then adding silica powder quartz sand, and uniformly mixing to obtain mixed powder;
2) sequentially adding the colloid A and the colloid B in the high-viscosity conductive phase into water, and uniformly mixing to obtain a dispersion liquid;
3) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
4) pouring the obtained mixture into moulds of 40 × 40 × 40mm and 40 × 40 × 160mm respectively to prepare samples, vibrating during smashing, putting the samples into a standard curing box to be cured for 3 hours, then demoulding, and then putting the samples back into the standard curing box to be cured to the specified age.
Through detection, the conductive quick-hardening repairing material obtained in the embodiment has the compressive strength and the flexural strength of 65.5MPa and 11.7MP respectively after 3h, the compressive strength and the flexural strength of 88.3MPa and 12.5MP respectively after 28d, and the self-shrinkage rate is only 1.22 multiplied by 10 when 7d-4The resistivity is 12.8S/cm, and the resistivity is unchanged after the glass is soaked in strong acid and strong alkali for 7 days.
Example 2
A conductive quick-hardening repairing material comprises the following components in parts by weight: 500 parts of a cementing material, 650 parts of quartz sand, 80 parts of silicon powder, 80 parts of fly ash, 70 parts of gypsum, 160 parts of water, 12 parts of a water reducing agent, 8 parts of an expanding agent, 12 parts of a composite early strength setting accelerator and 40 parts of a high-viscosity conductive phase;
the preparation method of the cementing material comprises the following steps: fully and uniformly mixing 30 parts of kaolinite, 30 parts of limestone, 25 parts of bauxite and 12 parts of Fe powder, and grinding the mixture to be less than 200 meshes to obtain a raw material; placing the obtained raw material in an electric heating constant temperature blast drying oven at 120 ℃ for drying for 2 h; transferring the dried mixture to a high-temperature furnace, firstly heating to 800 ℃ and preserving heat for 30min, and then continuously heating to 1500 ℃ and preserving heat for 30 min; after the calcination and sintering, cooling the calcined product to room temperature at the speed of 20 ℃/min, quenching the calcined product, grinding the cooled calcined product to 350 meshes, then adding 3 parts of graphite, carrying out secondary calcination at the temperature of 200 ℃, and preserving the heat for 20min to obtain the cementing material with the characteristics of early strength and rapid hardening;
the high-viscosity conductive phase consists of a colloid A and a colloid B, wherein the colloid A is obtained by uniformly stirring 4 parts of water, 8 parts of an expanding agent, 4 parts of graphite, 0.2 part of water glass and 0.0001 part of hydroxymethyl cellulose ether under the stirring condition of 200r/min, the conductivity is 90S/cm, and the viscosity is 936mPa & S; colloid B, obtained by adding 0.8 part of uranium oxide, 0.8 part of thorium oxide, 1 part of zirconium oxide, 0.4 part of carbon powder and 0.2 part of Fe powder to 3 parts of boiled distilled water, followed by further boiling at 100 ℃ for 1.5 hours, had a conductivity of 85S/cm and a viscosity of 1008 mPas;
the composite early strength accelerator is prepared by uniformly mixing 8 parts of triethanolamine, 8 parts of formic acid, 8 parts of sodium fluoride, 15 parts of aluminum sulfate and 4 parts of slaked lime, adding 18 parts of water, and continuously stirring uniformly;
the preparation method of the conductive quick-hardening repair material comprises the following steps:
1) mixing and stirring the weighed self-made cementing material with gypsum and fly ash uniformly; then adding silicon powder and quartz sand, and uniformly mixing to obtain mixed powder;
2) adding the colloid A and the colloid B in the high-viscosity conductive phase into water in sequence, and uniformly mixing to obtain a dispersion liquid;
3) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
4) pouring the obtained mixture into molds of 40 multiplied by 40mm and 40 multiplied by 160mm respectively for sample preparation, vibrating during smashing, putting into a standard curing box for curing for 3 hours, then demoulding, and then putting back into the standard curing box for curing to the specified age.
Through detection, the conductive fast-hardening repair material obtained in the embodiment has the compression strength and the breaking strength of 63.1MPa and 11.5MP respectively after 3h, the compression strength and the breaking strength of 85.9MPa and 12.4MP respectively after 28d compression, and the self-shrinkage rate is only 1.29 multiplied by 10 when 7d-4The resistivity is 11.3S/cm and is unchanged after being soaked in strong acid and strong alkali for 7 days.
Example 3
A conductive quick-hardening repairing material comprises the following components in parts by weight: 600 parts of a cementing material, 700 parts of quartz sand, 80 parts of silicon powder, 80 parts of fly ash, 80 parts of gypsum, 160 parts of water, 18 parts of a water reducing agent, 10 parts of an expanding agent, 10 parts of a composite early strength setting accelerator and 45 parts of a high-viscosity conductive phase;
the preparation method of the cementing material comprises the following steps: uniformly mixing 38 parts of kaolinite, 30 parts of limestone, 20 parts of bauxite and 12 parts of Fe powder, and grinding to below 200 meshes to obtain a raw material; placing the obtained raw material in an electric heating constant temperature blast drying oven at 120 ℃ for drying for 3 h; transferring the dried mixture to a high-temperature furnace, firstly heating to 900 ℃ and preserving heat for 20min, and then continuously heating to 1500 ℃ and preserving heat for 30 min; after calcining and sintering, cooling the calcined product to room temperature at the speed of 20 ℃/min and grinding the calcined product to 350 meshes, then adding 3 parts of graphite, carrying out secondary calcination at the temperature of 200 ℃, and carrying out heat preservation for 20min to obtain the cementing material with the characteristics of early strength and rapid hardening;
the high-viscosity conductive phase consists of a colloid A and a colloid B, wherein the colloid A is obtained by uniformly stirring 6 parts of water, 10 parts of an expanding agent, 6 parts of graphite, 0.3 part of water glass and 0.0001 part of hydroxymethyl cellulose ether under the stirring condition of 200r/min, the conductivity of the colloid A is 110S/cm, and the viscosity of the colloid A is 950mPa & S; the colloid B was obtained by adding 1.5 parts of uranium oxide, 1.5 parts of thorium oxide, 1 part of zirconium oxide, 0.6 part of carbon powder and 0.2 part of Fe powder to 5 parts of boiled distilled water, followed by continuing to boil at 100 ℃ for 2 hours, and had an electric conductivity of 98S/cm and a viscosity of 1020 mPas;
the composite early strength accelerator is prepared by uniformly mixing 10 parts of triethanolamine, 8 parts of formic acid, 8 parts of sodium fluoride, 20 parts of aluminum sulfate and 6 parts of slaked lime, adding 20 parts of water, and continuously stirring uniformly;
the preparation method of the conductive quick-hardening repairing material comprises the following steps:
1) mixing the weighed cementing material with gypsum and fly ash, and stirring uniformly; then adding silicon powder and quartz sand, and uniformly mixing to obtain mixed powder;
2) adding the colloid A and the colloid B in the high-viscosity conductive phase into water in sequence, and uniformly mixing to obtain a dispersion liquid;
3) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
4) pouring the obtained mixture into moulds of 40 × 40 × 40mm and 40 × 40 × 160mm respectively to prepare samples, vibrating during smashing, putting the samples into a standard curing box to be cured for 3 hours, then demoulding, and then putting the samples back into the standard curing box to be cured to the specified age.
Through detection, the conductive quick-hardening repair material of the embodiment has the compressive strength and the flexural strength of 69.4MPa and 12.6MP respectively after 3h, the compressive strength and the flexural strength of 28d are 93.8MPa and 13.7MP respectively, and the self-shrinkage rate is only 1.31 multiplied by 10 when 7d-4The resistivity is 9.7S/cm, and the sample does not change after being soaked in strong acid and strong alkali for 7 days.
Comparative example 1
A conductive quick-hardening repairing material comprises the following components in parts by weight: 400 parts of a cementing material, 600 parts of quartz sand, 50 parts of silicon powder, 50 parts of fly ash, 60 parts of gypsum, 140 parts of water, 10 parts of a water reducing agent, 8 parts of a composite early strength setting accelerator and 35 parts of a high-viscosity conductive phase;
the preparation method of the cementing material comprises the following steps: fully and uniformly mixing 27 parts of kaolinite, 30 parts of limestone, 30 parts of bauxite and 10 parts of Fe powder, and grinding the mixture to be below 200 meshes to obtain a raw material; placing the obtained raw material in an electric heating constant temperature blast drying oven at 120 ℃ for drying for 2 h; transferring the dried mixture to a high-temperature furnace, firstly heating to 1100 ℃, preserving heat for 25min, and then continuously heating to 1400 ℃, preserving heat for 30 min; after the calcination, cooling the primary calcination product to room temperature at the speed of 20 ℃/min, grinding the primary calcination product to 350 meshes, then adding 3 parts of graphite, carrying out secondary calcination at the temperature of 200 ℃, and preserving heat for 20min to obtain the cementing material with the characteristics of early strength and quick hardening;
the high-viscosity conductive phase consists of a colloid A and a colloid B, wherein the colloid A is obtained by uniformly stirring 3 parts of water, 3 parts of graphite, 0.1 part of water glass and 0.0001 part of hydroxymethyl cellulose ether under the stirring condition of 100r/min, the conductivity is 62S/cm, and the viscosity is 923mPa & S; the colloid B was obtained by adding 0.5 part of uranium oxide, 0.5 part of thorium oxide, 1 part of zirconium oxide, 0.2 part of carbon powder and 0.2 part of Fe powder to 2 parts of boiled distilled water, followed by continuing to boil at 100 ℃ for 1 hour, and had an electric conductivity of 89S/cm and a viscosity of 890mPa · S;
the composite early strength accelerator is prepared by uniformly mixing 5 parts of triethanolamine, 8 parts of formic acid, 8 parts of sodium fluoride, 12 parts of aluminum sulfate and 2 parts of slaked lime, adding 15 parts of water, and continuously stirring uniformly;
the preparation method of the conductive quick-hardening repair material comprises the following steps:
1) mixing and stirring the weighed cementing material with gypsum and fly ash uniformly; then adding silica powder quartz sand, and uniformly mixing to obtain mixed powder;
2) adding the colloid A and the colloid B in the high-viscosity conductive phase into water in sequence, and uniformly mixing to obtain a dispersion liquid;
3) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
4) pouring the obtained mixture into moulds of 40 × 40 × 40mm and 40 × 40 × 160mm respectively to prepare samples, vibrating during smashing, putting the samples into a standard curing box to be cured for 3 hours, then demoulding, and then putting the samples back into the standard curing box to be cured to the specified age.
Through detection, the conductive quick-hardening repair material obtained by the comparative example has the compression strength and the rupture strength of 28.9MPa and 2.8MP respectively after 3 hours, has the compression strength and the rupture strength of 42.5MPa and 4.5MP respectively after 28d, and has obvious strength reduction; the self-shrinkage rate at 7d is as high as 9.56 multiplied by 10-4The resistivity is 38.2S/cm, no expanding agent is added in the comparative example, although no crack is found in the appearance of the repair material, the stress difference in the process of forming the strength due to rapid forming in the interior of the repair material is presumed to be far greater than that in the example 1, more defects exist in the interior of the repair material, the volume stability is poor, the graphite dispersion uniformity is insufficient, and the conductivity is obviously reduced.
Comparative example 2
A conductive quick-hardening repairing material comprises the following components in parts by weight: 400 parts of a cementing material, 600 parts of quartz sand, 50 parts of silicon powder, 50 parts of fly ash, 60 parts of gypsum, 140 parts of water, 10 parts of a water reducing agent, 5 parts of an expanding agent, 8 parts of a composite early strength setting accelerator, 10 parts of graphite and 35 parts of a high-viscosity conductive phase;
the preparation method of the cementing material comprises the following steps: fully and uniformly mixing 27 parts of kaolinite, 30 parts of limestone, 30 parts of bauxite and 10 parts of Fe powder, and grinding the mixture to be below 200 meshes to obtain a raw material; placing the obtained raw material in an electric heating constant temperature blast drying oven at 120 ℃ for drying for 2 h; transferring the dried mixture to a high-temperature furnace, firstly heating to 900 ℃, preserving heat for 25min, and then continuously heating to 1400 ℃, preserving heat for 30 min; after calcining and sintering, cooling the primary calcined product to room temperature at the speed of 20 ℃/min and grinding the product to 350 meshes to obtain the cementing material with the characteristics of early strength and rapid hardening;
the high-viscosity conductive phase consists of a colloid A and a colloid B, wherein the colloid A is obtained by uniformly stirring 3 parts of water, 5 parts of an expanding agent, 0.1 part of water glass and 0.0001 part of hydroxymethyl cellulose ether under the stirring condition of 200r/min, the conductivity is 97S/cm, and the viscosity is 950mPa & S; colloid B was obtained by adding 0.5 part of uranium oxide, 0.5 part of thorium oxide, 1 part of zirconium oxide, 0.2 part of carbon powder and 0.2 part of Fe powder to 2 parts of boiled distilled water, followed by further boiling at 100 ℃ for 1 hour, and had an electric conductivity of 89S/cm and a viscosity of 899 mPas;
the composite early strength accelerating agent is prepared by uniformly mixing 5 parts of triethanolamine, 8 parts of formic acid, 8 parts of sodium fluoride, 12 parts of aluminum sulfate and 2 parts of slaked lime, adding 15 parts of water, and continuously and uniformly stirring;
the preparation method of the conductive quick-hardening repair material comprises the following steps:
1) mixing and stirring the weighed cementing material with gypsum and fly ash uniformly; then adding silica powder quartz sand, and uniformly mixing to obtain mixed powder;
2) adding the colloid A and the colloid B in the high-viscosity conductive phase into water in sequence, and uniformly mixing to obtain a dispersion liquid;
3) adding the water reducing agent, the composite early-strength setting accelerator, the graphite, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
4) pouring the obtained mixture into molds of 40 multiplied by 40mm and 40 multiplied by 160mm respectively for sample preparation, vibrating during smashing, putting into a standard curing box for curing for 3 hours, then demoulding, and then putting back into the standard curing box for curing to the specified age.
Through detection, the conductive quick-hardening repairing material obtained in the embodiment has the compression strength and the breaking strength of 43.8MPa and 9.1MP respectively after 3 hours, the compression strength and the breaking strength of 68.2MPa and 9.6MP respectively after 28 days of compression, has no obvious change after being soaked in strong acid and strong base for 7 days, has the resistivity of 45.9S/cm, and has poor conductivity.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.

Claims (8)

1. The conductive quick-hardening repairing material is characterized by comprising the following components in parts by weight: 400-600 parts of a cementing material, 600-700 parts of quartz sand, 50-100 parts of silicon powder, 50-100 parts of fly ash, 60-100 parts of gypsum, 120-160 parts of water, 10-20 parts of a water reducing agent, 5-10 parts of an expanding agent, 8-15 parts of a composite early strength setting accelerator and 30-45 parts of a high-viscosity conductive phase;
the conductivity of the high-viscosity conductive phase is 90-110S/cm, and the viscosity is 790-1030 mPa.s; it comprises colloid A and colloid B; wherein the colloid A is formed by compounding 3-6 parts of water, 5-10 parts of an expanding agent, 3-6 parts of graphite, 0.1-0.3 part of water glass and 0.0001-0.0002 part of hydroxymethyl cellulose ether, the solid content of the colloid A is 65-72%, the conductivity of the colloid A is 90-120S/cm, and the viscosity of the colloid A is 800-1000 mPa.s; the colloid B is prepared by mixing 2-5 parts of boiling water, 0.5-1.5 parts of uranium oxide, 0.5-1.5 parts of thorium oxide, 1-3 parts of zirconium oxide, 0.2-0.6 part of carbon powder and 0.2-0.5 part of Fe powder, and boiling for 1-2 hours, wherein the solid content is 68-85%, the conductivity is 80-100S/cm, and the viscosity is 820-1050 mPa.s.
2. The electrically conductive quick-hardening repair material according to claim 1, wherein the swelling agent is selected from the group consisting of CaO and Al2O3、Al(OH)3And CaSO4The composite material is compounded according to the mass ratio of (1) - (2) to (1) - (1.5).
3. The conductive fast-hardening repairing material of claim 1, wherein the mass ratio of particles corresponding to 40-80 mesh, 80-120 mesh and 120-160 mesh in the quartz sand is 1 (1-1.5) to 1.5-2.0.
4. The electrically conductive rapid-hardening repairing material according to claim 1, wherein said gel material is mainly made of kaolinite, limestone, bauxite, Fe powder and graphite, and said kaolinite, limestone, bauxite and Fe powder are first mixed, ground, dried and calcined; quenching the primary calcined product, grinding the primary calcined product into powder of 350 meshes, and adding graphite to perform secondary calcination at low temperature to obtain the product.
5. The conductive fast-hardening repairing material as claimed in claim 4, wherein the mass ratio of kaolinite, limestone, bauxite, Fe powder and graphite is (25-40): (20-60): (10-20): (1-3).
6. The electrically conductive rapid-hardening repair material according to claim 4, wherein the primary calcination process is: firstly, heating to 700-900 ℃, preserving heat for 20-30 min, and then continuously heating to 1400-1500 ℃, preserving heat for 30-35 min; the secondary calcination process comprises the steps of heating from room temperature to 200-300 ℃, preserving heat for 20-30 min, and then naturally cooling to room temperature.
7. The conductive quick-hardening repairing material as claimed in claim 1, wherein the composite early strength setting accelerator comprises the following components in parts by weight: 5-10 parts of triethanolamine, 8-10 parts of formic acid, 8-10 parts of sodium fluoride, 12-20 parts of aluminum sulfate, 2-6 parts of slaked lime and 15-20 parts of water.
8. The method for preparing the conductive fast-hardening repairing material according to any one of claims 1 to 7, comprising the steps of:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 400-600 parts of a cementing material, 600-700 parts of quartz sand, 50-100 parts of silicon powder, 50-100 parts of fly ash, 60-100 parts of gypsum, 120-160 parts of water, 10-20 parts of a water reducing agent, 5-10 parts of an expanding agent, 8-15 parts of a composite early strength setting accelerator and 30-45 parts of a high-viscosity conductive phase;
2) mixing and stirring the cementing material, gypsum and fly ash uniformly; then adding silicon powder and quartz sand, and uniformly mixing to obtain mixed powder;
3) sequentially adding the colloid A and the colloid B in the high-viscosity conductive phase into water, and uniformly mixing to obtain a dispersion liquid;
4) adding the water reducing agent, the composite early strength setting accelerator, the mixed powder obtained in the step 2) and the dispersion liquid obtained in the step 3) into a stirrer for fully stirring to obtain a mixture;
5) and pouring, molding and maintaining the obtained mixture to obtain the conductive quick-hardening repairing material.
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