CN113185243B - Low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and using method thereof - Google Patents

Low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and using method thereof Download PDF

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CN113185243B
CN113185243B CN202110406337.2A CN202110406337A CN113185243B CN 113185243 B CN113185243 B CN 113185243B CN 202110406337 A CN202110406337 A CN 202110406337A CN 113185243 B CN113185243 B CN 113185243B
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water
performance concrete
aggregate
repair material
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CN113185243A (en
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邹定华
王东明
江梦飞
刘园彬
霍俊锋
黄江歌
徐恬昊
赵奇胜
李云龙
王凯
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Henan University of Technology
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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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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

Abstract

The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and a using method thereof. The material comprises the following components in parts by weight: 24-28 parts of Portland cement, 2-4 parts of sulphoaluminate cement, 4-5 parts of expanding agent, 5-7 parts of modified mineral admixture, 5-7 parts of common mineral admixture, 20-25 parts of common aggregate, 20-25 parts of porous aggregate, 6-8 parts of water, 1-1.5 parts of water reducing agent and 0-6 parts of steel fiber; the total weight of all the components is 100 parts, and the porous aggregate absorbs water firstly when in use, and the weight of the porous aggregate is calculated by the weight before water absorption. The modified mineral admixture can increase the distance between particles in the slurry, reduce the viscosity of the slurry and improve the working performance of the slurry; the moisture in the water-saturated porous aggregate flows to the pores under the action of the capillary pressure difference between the aggregate and the pores of the concrete, so that the reduction of the internal humidity of the concrete is inhibited, and the shrinkage of the concrete is greatly reduced.

Description

Low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and using method thereof
Technical Field
The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and a using method thereof.
Background
Ultra-high performance concrete is an excellent concrete material. Because the water-gel ratio is very low and a large amount of active auxiliary cementing materials are added, the strength development is fast, the 1d compressive strength can reach more than 60MPa, the later strength is continuously increased, and the phenomenon of retraction is avoided. And the ultrahigh-performance concrete has low porosity, high resistance to environmental erosion, and excellent wear resistance and anti-explosion performance. In addition, the steel fiber improves the ultimate deformation of the super-performance concrete to more than 7 times of that of the common concrete, so the steel fiber is very suitable for being used as a repairing material.
However, the ultra-high performance concrete as a repair material has two problems. One is its poor filling properties: the water-cement ratio of the ultra-high performance concrete is generally lower than 0.2, and the specific surface area of the blended active mineral admixture is large, so that the free moisture for lubricating particles in the ultra-high performance concrete is very little, and the dispersing capacity of the existing polycarboxylic acid water reducing agent is insufficient, so that the distance between the particles in slurry is short, the interaction is strong, the slurry viscosity of fresh concrete is large, the filling property is poor, and the construction performance is poor. Secondly, the shrinkage is large: the water-cement ratio of the ultra-high performance concrete is extremely low, the internal humidity of the ultra-high performance concrete is rapidly reduced after hydration, and great capillary shrinkage stress is generated in pores, so that the concrete is large in shrinkage and low in porosity, external moisture is difficult to permeate into the concrete to improve the internal humidity, and the shrinkage is reduced.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a low-viscosity low-shrinkage ultrahigh-performance concrete repairing material and a using method thereof, and aims to solve the problems that the existing ultrahigh-performance concrete is poor in filling performance and large in shrinkage rate and is not suitable for being used as a repairing material.
In order to realize the purpose, the invention provides the following technical scheme:
the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 24-28 parts of Portland cement, 2-4 parts of sulphoaluminate cement, 4-5 parts of expanding agent, 5-7 parts of modified mineral admixture, 5-7 parts of common mineral admixture, 20-25 parts of common aggregate, 20-25 parts of porous aggregate, 6-8 parts of water, 1-1.5 parts of water reducing agent and 0-6 parts of steel fiber; the total weight of all the components is 100 parts, wherein the porous aggregate absorbs water firstly when in use, and the weight of the porous aggregate is calculated by the weight before water absorption.
Preferably, the Portland cement is a mixture consisting of one or more than two of 62.5-grade ordinary Portland cement, 52.5-grade ordinary Portland cement and 42.5-grade ordinary Portland cement.
Preferably, the sulphoaluminate cement is a mixture consisting of one or more than two of 62.5-grade sulphoaluminate cement, 52.5-grade sulphoaluminate cement and 42.5-grade sulphoaluminate cement.
Preferably, the expanding agent is one or a mixture of more than two of calcium oxide, calcium sulphoaluminate and magnesium oxide.
Preferably, the common mineral admixture is a mixture of one or more of silica fume, rice hull ash, kaolin and waste glass powder.
Preferably, the common aggregate is one or a mixture of more than two of quartz sand, river sand and machine-made sand.
Preferably, the aggregate has a gradation of 0 to 2.36mm in continuous gradation.
Preferably, the porous aggregate is ceramsite with water absorption rate of more than 10% and apparent density of more than 1.8g/cm < 3 >.
Preferably, the grading of the porous aggregate is 0-2.36 mm continuous grading.
Preferably, the water reducing rate of the water reducing agent is more than 20%;
preferably, the water reducing agent is a polycarboxylic acid concrete water reducing agent.
Preferably, the steel fiber is copper-plated steel fiber, and the tensile strength of the copper-plated steel fiber is greater than 2000MPa.
Preferably, the preparation method of the modified mineral admixture comprises the following steps:
(1) Silane and water are mixed according to the mass ratio of (1-5): 100 stirring, mixing and heating;
(2) After the temperature is raised to 60-90 ℃, the temperature is preserved and the mass ratio of the fly ash to the water is (5-20): 100 adding the fly ash, and continuously stirring to obtain a mixed solution;
(3) And separating out solids from the mixed solution, and then heating and drying the solids to obtain the modified mineral admixture.
Preferably, the silane is one or a mixture of more than two of dodecyl trimethoxy silane, dodecyl ethoxy silane, hexadecyl trimethoxy silane, hexadecyl ethoxy silane, octadecyl trimethoxy silane and octadecyl ethoxy silane.
Preferably, the fly ash is commercial grade I or II fly ash.
Preferably, in the step (2), the stirring is continued for 0.5 to 2 hours.
Preferably, in the step (3), the heating temperature is 100-150 ℃, and the drying time is 4-8 hours.
The use method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: immersing the porous aggregate in water for 3-6 hours, taking out the porous aggregate and draining for 10-30 minutes to obtain the treated porous aggregate for later use;
step two: treating the area to be repaired;
step three: adding portland cement, sulphoaluminate cement, an expanding agent, a modified mineral admixture, a common aggregate and the treated porous aggregate into a stirrer, stirring for 1 minute, mixing a water reducing agent and water to prepare an aqueous solution, adding the aqueous solution into the stirrer, continuously stirring for 3-5 minutes, adding steel fibers, and stirring for 3-5 minutes to obtain the ultrahigh-performance concrete repair material;
step four: and paving the ultrahigh-performance concrete repairing material in the treated area to be repaired, and trowelling and compacting.
Has the advantages that:
the invention adopts the modified mineral admixture, which is beneficial to improving the working performance of the ultra-high performance concrete repair material. Specifically, silane is adopted to modify the fly ash. Silane is a chemical additive with stronger dispersing ability than a polycarboxylic acid water reducing agent, but the silane has more problems when being directly mixed into a concrete repair material. The steric hindrance of the silane carbon chains is a source of the dispersing ability, and thus the silane must be adsorbed onto the surface of the cement or mineral admixture in order to function. The hydroxyl groups generated by hydrolysis of the silane groups via methoxy or ethoxy groups react with the hydroxyl groups on the surface of the cement or mineral admixture to adsorb on the surface, but this process is dependent on the length of the silane molecular chain. The shorter the molecular chain, the faster the silane is adsorbed, but the faster the silane is delayed coagulation, the early strength of the ultrahigh-performance concrete is greatly reduced, and the requirement of the repair material cannot be met. Thus. The longer the molecular chain, the slower the hydrolysis speed, the less the influence on the hydration and early strength of the concrete, but the slow adsorption speed, and the inability to fully exert the dispersion effect during the stirring process, therefore, the effect of improving the working performance of the concrete is poor. As the adsorption of the silane is a chemical reaction, the surface modification is carried out on the fly ash by adopting the long-chain silane, the silane is adsorbed on the surface of the fly ash in advance, and the adsorption process is accelerated by heating to ensure that the fly ash reaches saturated adsorption in a short time, thereby preparing the modified mineral admixture. The silane is adsorbed on the surface of the fly ash because of the strong hydrophobic effect of the silane, and the adsorption of the silane on the surface of active mineral admixtures such as cement or silica fume, rice hull ash, kaolin and the like can influence the hydration of the cement and the pozzolanic reaction of the active mineral admixtures, so that the early strength of the concrete is greatly reduced. The silane adsorbed on the surface of the modified mineral admixture can play a dispersing role at the beginning of concrete stirring, and the distance between particles in slurry is increased, so that the viscosity of the slurry is reduced, and the working performance of the slurry is improved.
In addition, the invention replaces a part of common aggregate with porous aggregate, and the porous aggregate absorbs water before being mixed into concrete. The moisture in the water-saturated porous aggregate flows to the pores under the action of the capillary pressure difference between the aggregate and the pores of the concrete, so that the reduction of the internal humidity of the concrete is inhibited, and the shrinkage of the concrete is greatly reduced. Meanwhile, the expanding agent reacts with water to expand, so that the shrinkage of the concrete is further reduced. In addition, the water-cement ratio of the ultra-high performance concrete is low, and the hydration degree of the cement is very low. After entering the cement paste, the water of the porous aggregate can also react with unhydrated cement to generate expansion, thereby further inhibiting shrinkage and improving strength. Sulphoaluminate cement hydrates to swell and thus its substitution for a portion of portland cement also reduces shrinkage.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 24-28 parts of Portland cement, 2-4 parts of sulphoaluminate cement, 4-5 parts of expanding agent, 5-7 parts of modified mineral admixture, 5-7 parts of common mineral admixture, 20-25 parts of common aggregate, 20-25 parts of porous aggregate, 6-8 parts of water, 1-1.5 parts of water reducing agent and 0-6 parts of steel fiber; the total of all the components is 100 parts, wherein the porous aggregate absorbs water firstly when in use, and the weight of the porous aggregate is calculated by the weight before water absorption.
The components are as follows:
the Portland cement is a mixture (with any proportion) consisting of one or more than two of 62.5-grade, 52.5-grade and 42.5-grade ordinary Portland cement;
the sulphoaluminate cement is a mixture (with any proportion) consisting of one or more than two of 62.5-grade sulphoaluminate cement, 52.5-grade sulphoaluminate cement and 42.5-grade sulphoaluminate cement;
the expanding agent is a mixture (with any proportion) of one or more than two of calcium oxide, calcium sulphoaluminate and magnesium oxide;
the common mineral admixture is a mixture (with any proportion) composed of one or more than two of silica fume, rice hull ash, kaolin and waste glass powder;
the common aggregate is one or a mixture of more than two of quartz sand, river sand and machine-made sand; preferably, the aggregate is a mixture formed by one or more of quartz sand, river sand and machine-made sand with 0-2.36 mm continuous gradation in any proportion;
the porous aggregate has water absorption rate higher than 10% and apparent propertyThe density is more than 1.8g/cm 3 Ceramsite of (2); preferably, the grading of the porous aggregate is 0-2.36 mm continuous grading;
the water reducing rate of the water reducing agent is more than 20 percent; preferably, the water reducing agent is a polycarboxylic acid concrete water reducing agent;
the steel fiber is copper-plated steel fiber, and the tensile strength of the copper-plated steel fiber is greater than 2000MPa.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Silane and water are mixed according to the mass ratio of (1-5): 100 (for example, 1;
(2) Heating to 60-90 deg.c (60 deg.c, 65 deg.c, 70 deg.c, 75 deg.c, 80 deg.c, 85 deg.c and 90 deg.c), maintaining and mixing the mixture in the ratio of flyash to water in 5-20: 100 (for example, the ratio of 5;
(3) And separating out solids from the mixed solution, and then heating and drying the solids to obtain the modified mineral admixture.
In the preparation method of the modified mineral admixture, the silane is a mixture (with any proportion) of one or more than two of dodecyl trimethoxy silane, dodecyl ethoxy silane, hexadecyl trimethoxy silane, hexadecyl ethoxy silane, octadecyl trimethoxy silane and octadecyl ethoxy silane; the fly ash is commercially available class I or class II fly ash; in the step (2), the stirring is continued for 0.5 to 2 hours (e.g., 0.5 hour, 1 hour, 1.5 hours, 2 hours); in the step (3), the heating temperature is 100 to 150 ℃ (e.g., 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃), and the drying time is 4 to 8 hours (e.g., 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours).
The use method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: immersing the porous aggregate in water for 3-6 hours (e.g., 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours), taking out and draining for 10-30 minutes (e.g., 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes) for standby;
step two: the method for treating the area to be repaired specifically comprises the following steps: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and cleaning the repaired area by using a water gun or a fan;
step three: adding portland cement, sulphoaluminate cement, an expanding agent, a modified mineral admixture, a common aggregate and the treated porous aggregate into a stirrer, stirring for 1 minute, mixing a water reducing agent and water to prepare a water solution, adding the water solution into the stirrer, continuously stirring for 3-5 minutes (such as 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes and 5 minutes), adding steel fibers, and stirring for 3-5 minutes (such as 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes and 5 minutes) to obtain the ultrahigh-performance concrete repair material;
step four: and spreading the ultra-high performance concrete repairing material on the treated area to be repaired, leveling and compacting, wherein a flat vibrator can be used during compaction.
The invention is further described below with reference to specific examples.
Example 1
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material disclosed by the embodiment comprises the following components in parts by weight: 26 parts of Portland cement, 3 parts of sulphoaluminate cement, 5 parts of an expanding agent, 6 parts of a modified mineral admixture, 4 parts of a common mineral admixture, 23 parts of common aggregate, 22 parts of porous aggregate (by weight before water absorption), 7 parts of water, 1 part of a water reducing agent and 3 parts of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Mixing dodecyl trimethoxy silane and water according to the weight ratio of 2: adding 100 parts of the mixture into a container, stirring and heating;
(2) After the temperature is raised to 80 ℃, keeping the temperature, adding the fly ash according to the mass ratio of the fly ash to the water of 10;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash in a heater at the temperature of 105 ℃ for 6 hours to obtain the modified mineral admixture.
The other components are specifically as follows:
portland cement is 52.5 grade;
the sulphoaluminate cement is 52.5 grade;
the expanding agent is a mixture of calcium oxide and calcium sulphoaluminate expanding agents, and the mass ratio is 5:5;
the common mineral admixture is silica fume;
the common aggregate is river sand with 0-2.36 mm continuous gradation;
the porous aggregate is 0-2.36 mm continuous gradation ceramsite, the water absorption rate is 15 percent, and the apparent density is 1.92g/mL (namely g/cm) 3 )；
The water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 23 percent;
the steel fiber is copper-plated steel fiber, and the compressive strength is 2300MPa.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: soaking the porous aggregate in water for 5 hours, taking out the porous aggregate and draining for 30 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and cleaning the repaired area by using a water gun or a fan;
step three: adding 26 parts of portland cement, 3 parts of sulphoaluminate cement, 5 parts of an expanding agent, 6 parts of a modified mineral admixture, 4 parts of a common mineral admixture, 23 parts of a common aggregate and 22 parts of a porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1 part of a water reducing agent in 7 parts of water, adding the water reducing agent into the stirrer, continuously stirring for 4 minutes to obtain slurry, and sieving 3 parts of steel fibers into the slurry by using a sieve and stirring for 4 minutes to obtain the ultrahigh-performance concrete repair material;
step four: and paving the obtained ultra-high performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative examples 1 to 1
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the use amount and the method steps of other components are the same as those in the example 1, and are not repeated.
Comparative examples 1 to 2
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, and the selection, the use amount and the method steps of other components are the same as those in the example 1, and are not repeated herein.
Comparative examples 1 to 3
In the repair material provided by the comparative example, the porous aggregate is replaced by the common aggregate, and the selection, the use amount and the method steps of other components are the same as those in the example 1, and are not repeated.
Comparative examples 1 to 4
The patching material provided by the comparative example has the advantages that the porous aggregate is not soaked before use, the dosage of the porous aggregate and the selection, dosage and method steps of other components are the same as those in the example 1, and the details are not repeated.
Example 2
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 24 parts of portland cement, 4 parts of sulphoaluminate cement, 4 parts of an expanding agent, 5 parts of a modified mineral admixture, 5 parts of a common mineral admixture, 20 parts of common aggregate, 25 parts of porous aggregate (by weight before water absorption), 6.5 parts of water, 1.5 parts of a water reducing agent and 5 parts of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Adding dodecyl ethoxy silane and water according to the proportion of 5:100, adding the mixture into a container, stirring and heating;
(2) And (3) after the temperature is raised to 70 ℃, keeping the temperature and mixing the fly ash and the water according to the mass ratio of 20:100 adding the fly ash and continuing stirring for 0.5 hour;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash for 4 hours in a heater at the temperature of 120 ℃ to obtain the modified mineral admixture.
The other components are specifically as follows:
the silicate cement is 42.5 grade;
the sulphoaluminate cement is 42.5 grade;
the expanding agent is a mixture of calcium sulphoaluminate and magnesium oxide expanding agents, and the mass ratio of the calcium sulphoaluminate to the magnesium oxide expanding agents is 7:3;
the common mineral admixture is a mixture of silica fume, rice hull ash and kaolin, and the mass ratio is 5:3:2;
the common aggregate is a mixture of 0-2.36 mm continuous gradation quartz sand and river sand, and the mass ratio is 2:8;
the porous aggregate is 0-2.36 mm continuous gradation ceramsite, the water absorption rate is 12.2 percent, and the apparent density is 2.05g/mL;
the water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 25%;
the steel fiber is copper-plated steel fiber, and the compressive strength is 2400MPa.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: soaking the porous aggregate in water for 6 hours, taking out the porous aggregate and draining for 15 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and then cleaning the repaired area by using a water gun or a fan;
step three: adding 24 parts of portland cement, 4 parts of sulphoaluminate cement, 4 parts of an expanding agent, 5 parts of a modified mineral admixture, 5 parts of a common mineral admixture, 20 parts of common aggregate and 25 parts of porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1.5 parts of a water reducing agent in 6.5 parts of water, adding the mixture into the stirrer, continuously stirring for 3 minutes to obtain slurry, sieving 5 parts of steel fibers into the slurry by using a sieve, and stirring for 4 minutes to obtain the ultra-high performance concrete repair material;
step four: and paving the obtained ultrahigh-performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative example 2
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the use amount and the method steps of other components are the same as those in the example 2, and are not repeated.
Example 3
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 28 parts of Portland cement, 2 parts of sulphoaluminate cement, 3 parts of an expanding agent, 7 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 21 parts of a common aggregate, 24 parts of a porous aggregate (by weight before water absorption), 7.8 parts of water, 1.2 parts of a water reducing agent and 0 part of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Mixing hexadecyl trimethoxy silane and water according to the weight ratio of 1:100, adding the mixture into a container, stirring and heating;
(2) And (3) after the temperature is raised to 90 ℃, keeping the temperature, and mixing the fly ash and the water according to the mass ratio of 5: adding 100 parts of fly ash, and continuously stirring for 2 hours;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash in a heater for 8 hours at the temperature of 100 ℃ to obtain the modified mineral admixture.
The other components are specifically as follows:
portland cement is 62.5 grade;
the sulphoaluminate cement is 42.5 grade;
the expanding agent is a mixture of calcium oxide, calcium sulphoaluminate and magnesium oxide expanding agents, and the mass ratio of the expanding agent to the expanding agent is 3:5:2;
the common mineral admixture is a mixture of rice hull ash and waste glass powder, and the mass ratio of the rice hull ash to the waste glass powder is 6:4;
the common aggregate is a mixture of 0-2.36 mm continuous graded quartz sand and machine-made sand, and the mass ratio is 5:5;
the porous aggregate is 0-2.36 mm continuous graded ceramsite, the water absorption rate of the porous aggregate is 15.6%, and the apparent density of the porous aggregate is 1.85g/mL;
the water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 20 percent.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: soaking the porous aggregate in water for 3 hours, taking out the porous aggregate and draining for 20 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and cleaning the repaired area by using a water gun or a fan;
step three: adding 28 parts of portland cement, 2 parts of sulphoaluminate cement, 3 parts of an expanding agent, 7 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 21 parts of common aggregate and 24 parts of porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1.2 parts of a water reducing agent in 7.8 parts of water, adding into the stirrer, and continuously stirring for 4 minutes to obtain the ultrahigh-performance concrete repairing material;
step four: and paving the obtained ultrahigh-performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative example 3
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the dosage and the method steps of other components are the same as those in the example 3, and are not described herein again.
Example 4
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 25 parts of Portland cement, 4 parts of sulphoaluminate cement, 4 parts of an expanding agent, 5.5 parts of a modified mineral admixture, 6.5 parts of a common mineral admixture, 21 parts of common aggregate, 22 parts of porous aggregate (by weight before water absorption), 7.5 parts of water, 1.5 parts of a water reducing agent and 3 parts of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Mixing hexadecyl ethoxy silane and water according to the weight ratio of 3: adding 100 parts of the mixture into a container, stirring and heating;
(2) After the temperature is raised to 60 ℃, keeping the temperature and mixing the fly ash and the water according to the mass ratio of 14: stirring the 100 fly ash for 1.5 hours;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash for 5 hours in a heater at the temperature of 150 ℃ to obtain the modified mineral admixture.
The other components are specifically as follows:
the Portland cement is 52.5 grades;
the sulphoaluminate cement is 62.5 grade;
the expanding agent is calcium sulphoaluminate expanding agent;
the common mineral admixture is a mixture of silica fume and waste glass powder, and the mass ratio of the silica fume to the waste glass powder is 7:3;
the common aggregate is a mixture of river sand and machine-made sand with 0-2.36 mm continuous gradation, and the mass ratio is 5:5;
the porous aggregate is 0-2.36 mm continuous gradation ceramsite, the water absorption rate is 16.5%, and the apparent density is 1.97g/mL;
the water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 24 percent;
the steel fiber is copper-plated steel fiber, and the compressive strength is 2400MPa.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: soaking the porous aggregate in water for 5 hours, taking out the porous aggregate and draining for 10 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and then cleaning the repaired area by using a water gun or a fan;
step three: adding 25 parts of portland cement, 4 parts of sulphoaluminate cement, 4 parts of expanding agent, 5.5 parts of modified mineral admixture, 6.5 parts of common mineral admixture, 21 parts of common aggregate and 22 parts of porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1.5 parts of water reducing agent into 7.5 parts of water, adding into the stirrer, continuously stirring for 5 minutes to obtain slurry, sieving 3 parts of steel fiber into the slurry by a sieve, and stirring for 3 minutes to obtain the ultrahigh-performance concrete repair material.
Step four: and paving the obtained ultrahigh-performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative example 4
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the use amount and the method steps of other components are the same as those in the example 4, and are not repeated.
Example 5
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 27 parts of portland cement, 3 parts of sulphoaluminate cement, 5 parts of an expanding agent, 4 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 20 parts of a common aggregate, 25 parts of a porous aggregate (by weight before water absorption), 7.2 parts of water, 1.8 parts of a water reducing agent and 1 part of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Mixing octadecyl trimethoxyl silane and water according to the ratio of 4: adding 100 parts of the mixture into a container, stirring and heating;
(2) And (3) after the temperature is raised to 85 ℃, keeping the temperature and mixing the fly ash and the water according to the mass ratio of 18:100 adding the fly ash and continuing stirring for 1 hour;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash for 6.5 hours in a heater at the temperature of 130 ℃ to obtain the modified mineral admixture.
The other components are specifically as follows:
portland cement is 62.5 grade;
the sulphoaluminate cement is 52.5 grade;
the expanding agent is calcium oxide expanding agent;
the common mineral admixture is a mixture of silica fume and kaolin, and the mass ratio of the silica fume to the kaolin is 4:6;
the common aggregate is machine-made sand with 0-2.36 mm continuous gradation;
the porous aggregate is 0-2.36 mm continuous gradation ceramsite, the water absorption rate is 21 percent, and the apparent density is 2.07g/mL;
the water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 20 percent;
the steel fiber is copper-plated steel fiber, and the compressive strength is 2100MPa.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: soaking the porous aggregate in water for 4 hours, taking out the porous aggregate and draining for 18 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and cleaning the repaired area by using a water gun or a fan;
step three: adding 27 parts of portland cement, 3 parts of sulphoaluminate cement, 5 parts of an expanding agent, 4 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 20 parts of a common aggregate and 25 parts of a porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1.8 parts of a water reducing agent in 7.2 parts of water, adding the water reducing agent into the stirrer, continuously stirring for 4 minutes to obtain slurry, sieving 1 part of steel fibers into the slurry by a sieve, and stirring for 4 minutes to obtain the ultrahigh-performance concrete repair material.
Step four: and paving the obtained ultrahigh-performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative example 5
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the use amount and the method steps of other components are the same as those in the example 5, and are not repeated.
Example 6
The low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following components in parts by weight: 24 parts of portland cement, 2 parts of sulphoaluminate cement, 4 parts of an expanding agent, 7 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 21 parts of common aggregate, 22 parts of porous aggregate (by weight before water absorption), 6.8 parts of water, 1.2 parts of a water reducing agent and 6 parts of steel fiber; the total amount is 100 parts.
The preparation method of the modified mineral admixture comprises the following steps:
(1) Octadecyl ethoxy silane and water are mixed according to the proportion of 2.5:100, adding the mixture into a container, stirring and heating;
(2) And (3) after the temperature is raised to 75 ℃, keeping the temperature and mixing the fly ash and the water according to the mass ratio of 9: adding 100 parts of fly ash, and continuously stirring for 2 hours;
(3) Filtering the fly ash stirred in the step (2), and drying the fly ash for 7 hours in a heater at the temperature of 110 ℃ to obtain the modified mineral admixture.
The other components are specifically as follows:
the silicate cement is 42.5 grade;
the sulphoaluminate cement is 52.5 grade;
the expanding agent is calcium sulphoaluminate expanding agent;
the common mineral admixture is waste glass powder;
the common aggregate is 0-2.36 mm continuous gradation quartz sand;
the porous aggregate is 0-2.36 mm continuous gradation ceramsite, the water absorption rate is 14.4%, and the apparent density is 2.12g/mL;
the water reducing agent is a polycarboxylic acid concrete water reducing agent with the water reducing rate of 23 percent;
the steel fiber is copper-plated steel fiber, and the compressive strength is 2400MPa.
The application method of the low-viscosity low-shrinkage ultrahigh-performance concrete repair material comprises the following steps:
the method comprises the following steps: immersing the porous aggregate in water for 5 hours, taking out the porous aggregate and draining for 25 minutes for later use;
step two: increasing the roughness of the repaired area by using a water jet or a steel wire ball, and cleaning the repaired area by using a water gun or a fan;
step three: adding 24 parts of portland cement, 2 parts of sulphoaluminate cement, 4 parts of an expanding agent, 7 parts of a modified mineral admixture, 6 parts of a common mineral admixture, 21 parts of a common aggregate and 22 parts of a porous aggregate (based on the weight before water absorption) into a stirrer, stirring for 1 minute, dissolving 1.2 parts of a water reducing agent in 6.8 parts of water, adding the water reducing agent into the stirrer, continuously stirring for 5 minutes to obtain slurry, sieving 6 parts of steel fibers into the slurry by using a sieve, and stirring for 3 minutes to obtain the ultrahigh-performance concrete repair material.
Step four: and paving the obtained ultrahigh-performance concrete repairing material in a repairing area, and compacting by using a flat vibrator after trowelling.
Comparative example 6
In the repair material provided by the comparative example, the common fly ash is used for replacing the modified mineral admixture, the common aggregate is used for replacing the porous aggregate, and the selection, the dosage and the method steps of other components are the same as those in the example 6, and are not described herein again.
According to self-compacting concrete applicationStandard determination of technical regulations (JGJ/T283-2012), active powder concrete (GB/T31387-2015) and general concrete long-term performance and durability test method standards (GB/T50082-2009) for performance detection of the ultrahigh-performance concrete repair materials obtained in examples 1-6 and the repair materials in comparative examples 1-6, and relevant performance index detection results are shown in Table 1 (wherein T is T 50 Time to reach 50cm of spread).
TABLE 1 Properties of the materials of the examples and comparative examples
Figure BDA0003022504150000151
From the comparison, the concrete repair material of the invention has small expansibility (with proper viscosity), good filling performance and lower shrinkage rate, and is an ideal choice for concrete repair materials.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. The low-viscosity low-shrinkage ultrahigh-performance concrete repair material is characterized by comprising the following components in parts by weight: 24-28 parts of Portland cement, 2-4 parts of sulphoaluminate cement, 4-5 parts of expanding agent, 5-7 parts of modified mineral admixture, 5-7 parts of common mineral admixture, 20-25 parts of common aggregate, 20-25 parts of porous aggregate, 6-8 parts of water, 1-1.5 parts of water reducing agent and 0-6 parts of steel fiber; the total weight of all the components is 100 parts, wherein the porous aggregate absorbs water firstly when in use, and the weight of the porous aggregate is calculated by the weight before water absorption;
the preparation method of the modified mineral admixture comprises the following steps:
(1) Silane and water are mixed according to the mass ratio of (1-5): 100 stirring, mixing and heating;
(2) After the temperature is raised to 80-90 ℃, preserving the heat and mixing the fly ash and the water according to the mass ratio (5-20): 100 adding the fly ash into the mixture and continuously stirring the mixture for 0.5 to 2 hours to obtain mixed solution;
(3) Separating out solids from the mixed solution, and then heating and drying the solids, wherein the heating temperature is 100-150 ℃, and the drying time is 4-8 hours, so as to obtain the modified mineral admixture;
the silane is a mixture consisting of one or more of dodecyl trimethoxy silane, dodecyl ethoxy silane, hexadecyl trimethoxy silane, hexadecyl ethoxy silane, octadecyl trimethoxy silane and octadecyl ethoxy silane.
2. The low viscosity low shrinkage ultra high performance concrete repair material as claimed in claim 1, wherein the portland cement is a mixture of one or more of ordinary portland cement of 62.5 grade, 52.5 grade and 42.5 grade.
3. The low viscosity low shrinkage ultra high performance concrete repair material as claimed in claim 2, wherein said sulphoaluminate cement is a mixture of one or more of 62.5, 52.5 and 42.5 sulphoaluminate cement.
4. The low viscosity low shrinkage ultra-high performance concrete repair material as claimed in claim 1, wherein the swelling agent is one or a mixture of two or more of calcium oxide, calcium sulphoaluminate and magnesium oxide.
5. The low viscosity low shrinkage ultra high performance concrete repair material as claimed in claim 1, wherein the common mineral admixture is one or a mixture of two or more of silica fume, rice hull ash, kaolin and waste glass powder.
6. The low viscosity low shrinkage ultra-high performance concrete patching material of claim 1, wherein the common aggregate is one or a mixture of two or more of quartz sand, river sand and machine-made sand.
7. The low viscosity low shrinkage ultra high performance concrete repair material as claimed in claim 6, wherein the aggregate is graded in a continuous gradation of 0-2.36 mm.
8. The low viscosity low shrinkage ultra high performance concrete repair material of claim 1, wherein the porous aggregate has a water absorption of more than 10% and an apparent density of more than 1.8g/cm 3 The ceramsite of (2).
9. The low viscosity low shrinkage ultra high performance concrete repair material of claim 8, wherein the porous aggregate is graded in a 0-2.36 mm continuous grade.
10. The low viscosity low shrinkage ultra-high performance concrete patching material of claim 1, wherein the water reducing agent has a water reducing rate of greater than 20%.
11. The low viscosity low shrinkage ultra high performance concrete repair material of claim 1, wherein the water reducing agent is a polycarboxylic acid concrete water reducing agent.
12. The low viscosity low shrinkage ultra high performance concrete repair material according to claim 1, wherein the steel fibers are copper plated steel fibers having a tensile strength of more than 2000MPa.
13. The low viscosity low shrinkage ultra high performance concrete repair material as claimed in claim 1, wherein said fly ash is commercially available class i or class ii fly ash.
14. A method of using the low viscosity low shrinkage ultra high performance concrete repair material according to any one of claims 1 to 13, comprising the steps of:
the method comprises the following steps: immersing the porous aggregate into water for 3-6 hours, taking out the porous aggregate and draining for 10-30 minutes to obtain the treated porous aggregate for later use;
step two: treating the area to be repaired;
step three: adding portland cement, sulphoaluminate cement, an expanding agent, a modified mineral admixture, a common aggregate and the treated porous aggregate into a stirrer, stirring for 1 minute, mixing a water reducing agent and water to prepare an aqueous solution, adding the aqueous solution into the stirrer, continuously stirring for 3-5 minutes, adding steel fibers, and stirring for 3-5 minutes to obtain the ultrahigh-performance concrete repair material;
step four: and paving the ultrahigh-performance concrete repairing material in the treated area to be repaired, and trowelling and compacting.
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