CN110498649B - Low-shrinkage cement-based repair material and preparation method thereof - Google Patents

Low-shrinkage cement-based repair material and preparation method thereof Download PDF

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CN110498649B
CN110498649B CN201910825968.0A CN201910825968A CN110498649B CN 110498649 B CN110498649 B CN 110498649B CN 201910825968 A CN201910825968 A CN 201910825968A CN 110498649 B CN110498649 B CN 110498649B
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cement
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fly ash
stirring
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CN110498649A (en
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潘金龙
姜波
钱臻旭
童浩
陈思鹏
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Nanjing Bikasi Construction Technology Co ltd
Southeast University
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Nanjing Bikasi Construction Technology Co ltd
Southeast University
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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
    • C04B28/04—Portland cements
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
    • 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

Abstract

The invention discloses a low-shrinkage cement-based repair material and a preparation method thereof. The cement-based repair material comprises the following substances in parts by weight: 32-42 parts of cement, 27-47 parts of fly ash, 10-14 parts of silica fume, 10-18 parts of an expanding agent, 28-32 parts of fine aggregate, 18-24 parts of water, 0.40-0.85 part of a polycarboxylic acid water reducing agent and 1.5-2 parts of polyvinyl alcohol fiber. The preparation method comprises the following steps: a. according to the weight ratio, the cement, the fly ash, the silica fume, the expanding agent and the fine aggregate are dry-stirred for 2-6min at the rotating speed of 120-140 r/min; b. slowly adding 80-85 wt% of polycarboxylic acid water reducing agent and water, and stirring at the rotating speed of 120-140r/min for 4-8min to form uniform slurry; c. adding pre-dispersed polyvinyl alcohol fiber, and stirring at the rotation speed of 280 plus 300r/min for 3-5 min; d. adding the rest 15-20 wt% of polycarboxylic acid water reducer and water, and wet-stirring at the rotation speed of 280-300r/min for 3-7 min. The compressive strength of the cement-based repair material meets the requirement of C40 design strength, and has high ductility, low shrinkage and high chloride ion resistance.

Description

Low-shrinkage cement-based repair material and preparation method thereof
Technical Field
The invention relates to the field of fiber reinforced materials, in particular to a low-shrinkage cement-based repair material and a preparation method thereof.
Background
The cement-based material is one of the most widely applied building materials in the field of civil engineering, but the development of the traditional cement-based material is limited to a certain extent due to the inherent defects of low tensile strength, poor toughness, easy cracking, difficulty in controlling the width of cracks after cracking, easy invasion of chloride ions and the like. In view of the shortcomings of the conventional materials, a new cement-based material, engineering fiber reinforced cement-based composite (ECC), is being gradually applied. The material is a fiber reinforced cement-based composite material with a strain hardening and multi-crack cracking mechanism, the ultimate tensile strain of the material can reach more than 3%, and the material has excellent shock resistance, permeation resistance, frost resistance, corrosion resistance, wet and heat aging resistance, self-healing performance and the like. However, compared with cement-based materials such as concrete and the like, ECC has the problem of excessive drying shrinkage, and although ECC effectively limits the crack width, excessive drying shrinkage can cause the reduction of the cooperative working performance of ECC and other materials, and the popularization and application of ECC materials are affected. Moreover, chloride ions penetrate into the cement-based material to cause corrosion of steel bars and cracking of the cement base, thereby affecting the mechanical property and durability of the structure.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide a low-shrinkage cement-based repair material with good ductility and good chlorine ion resistance and a preparation method of the low-shrinkage cement-based repair material with low cost and simple operation.
The technical scheme is as follows: the invention relates to a low-shrinkage cement-based repair material which comprises the following substances in parts by weight: 32-42 parts of cement, 27-47 parts of fly ash, 10-14 parts of silica fume, 10-18 parts of an expanding agent, 28-32 parts of fine aggregate, 18-24 parts of water, 0.40-0.85 part of a polycarboxylic acid water reducing agent and 1.5-2 parts of polyvinyl alcohol fiber.
Preferably, 32-35 parts of cement, 40-47 parts of fly ash and 12-14 parts of silica fume, and has good ductility, good chlorine ion resistance and low shrinkage.
Wherein the cement is P.II.42.5 portland cement. The fly ash is class I fly ash. The loss on ignition of the silica fume is less than 6 percent, wherein the content of the silica is more than 85 percent, and the specific surface area is more than 15000m 2 In terms of/kg. The expanding agent is a low-alkali concrete expanding agent with 7d limited expansion rate of more than or equal to 0.03 percent and alkali content of less than or equal to 0.5 percent in water. The fine aggregate is 80-100 mesh quartz sand. Polyvinyl alcohol fibers have a density of 1.3g/cm 3 The ultimate tensile strength is greater than or equal to 1200MPa, the ultimate elongation is greater than or equal to 8 percent, and the elastic modulus is 36-40 GPa.
The preparation method of the low-shrinkage cement-based repair material comprises the following steps:
a. according to the weight ratio, dry stirring cement, fly ash, silica fume, expanding agent and fine aggregate for 2-6min at the rotating speed of 120-140 r/min;
b. slowly adding 80-85 wt% of polycarboxylic acid water reducing agent and water, and stirring at the rotating speed of 120-140r/min for 4-8min to form uniform slurry;
c. dispersing the stranded and clustered polyvinyl alcohol fibers into single fibers, adding the pre-dispersed polyvinyl alcohol fibers, and stirring at the rotating speed of 280-300r/min for 3-5 min;
d. adding the rest 15-20 wt% of polycarboxylic acid water reducer and water, wet-stirring at the rotation speed of 280 plus materials and 300r/min for 3-7min, and uniformly stirring to obtain the low-shrinkage cement-based repair material.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the compressive strength of the cement-based repair material meets the requirement of C40 design strength, and has high ductility, low shrinkage and high chloride ion resistance;
2. silicon ash is used for replacing part of fly ash, the particle grading is optimized, the working performance of slurry is improved, and the uniform dispersion of fibers is facilitated;
3. the swelling agent is used for replacing part of the cementing material, so that the drying shrinkage is reduced;
4. domestic polyvinyl alcohol fiber is used for replacing imported polyvinyl alcohol fiber, so that the material cost is reduced;
5. the cement-based repairing material and the repaired material have good interface bonding capacity, and the repairing quality is improved while the repairing process is simplified.
Drawings
FIG. 1 is a stress-strain graph for uniaxial tensile testing of the present invention;
FIG. 2 is a graph of shrinkage on drying values over age according to the present invention.
Detailed Description
The cement used in the following examples is P.II.42.5 portland cement, the fly ash is class I fly ash, the loss on ignition of silica fume is less than 6%, the silica content is greater than 85%, the specific surface area is greater than 15000m 2 The swelling agent is water with 7d limited swelling rate not less than 0.03% and alkaliThe low-alkali concrete expanding agent with the content of not more than 0.5 percent, the fine aggregate is 80-100 meshes of quartz sand, and the polyvinyl alcohol fiber has the density of 1.3g/cm 3 And polyvinyl alcohol chopped fibers having a length of 12mm, a diameter of 38 [ mu ] m, an ultimate tensile strength of not less than 1200MPa, an ultimate elongation of not less than 8% and an elastic modulus of 38.0 GPa.
The curing schedule for the samples prepared in the following examples was:
and (3) carrying out die curing on the test piece for the uniaxial tensile test in a standard curing room (the temperature is 20 +/-2 ℃, and the relative humidity is more than or equal to 90%) for 1d, then demoulding, and putting the test piece into the standard curing room for curing for 28d for testing.
The test piece for the drying shrinkage performance test is subjected to mold maintenance for 1d in a standard maintenance room (the temperature is 20 +/-2 ℃ and the relative humidity is more than or equal to 90 percent), then is demoulded, is put into water (the temperature is 20 +/-2 ℃) to be maintained for 7d, and is transferred into a maintenance box (the temperature is 20 +/-2 ℃ and the relative humidity is 60 +/-5 percent) to be maintained for 90 d.
And (3) carrying out mold maintenance on a test piece for a chlorine ion permeation resistance test (a rapid chloride ion migration coefficient method) for 1d in a standard maintenance room (the temperature is 20 +/-2 ℃ and the relative humidity is more than or equal to 90%), demoulding, putting the test piece into water (the temperature is 20 +/-2 ℃) to maintain for 21d, cutting and forming, and putting the test piece into water to maintain for 28d for testing.
And (3) carrying out mold maintenance on the test piece for the cubic compressive strength test in a standard curing room (the temperature is 20 +/-2 ℃, and the relative humidity is more than or equal to 90%) for 1d, then demolding, and placing the test piece into the standard curing room for curing to 28d for testing.
Example 1
The low-shrinkage cement-based repair material comprises the following components in parts by weight: 32 parts of cement, 40 parts of fly ash, 14 parts of silica fume, 10 parts of an expanding agent, 30 parts of fine aggregate and 20 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.7 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 1.5 percent.
The preparation method comprises the following steps:
(1) dry-stirring cement, fly ash, silica fume, an expanding agent and fine aggregates for 2min at the rotating speed of 140r/min, slowly adding 85 percent of water dissolved with all polycarboxylic acid water reducers, and wet-stirring for 4min at the rotating speed of 140 r/min;
(2) after uniform slurry is formed, pre-dispersed polyvinyl alcohol fiber is added, and wet stirring is carried out for 3min at the rotating speed of 280 r/min;
(3) after the fibers are uniformly dispersed, adding the rest 15 percent of water dissolved with all the polycarboxylic acid water reducing agents, and wet-stirring at the rotating speed of 280r/min for 3 min;
(4) and stirring uniformly to obtain the high-ductility low-shrinkage high-chlorine ion-resistant cement-based repair material.
Example 2
The preparation method of this example is the same as that of example 1, except for the difference in components: 39 parts of cement, 27 parts of fly ash, 13 parts of silica fume, 14 parts of an expanding agent, 28 parts of fine aggregate and 24 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent.
Example 3
The preparation method of this example is the same as that of example 1, except for the difference in components: 42 parts of cement, 34 parts of fly ash, 10 parts of silica fume, 16 parts of an expanding agent, 32 parts of fine aggregate and 18 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent.
Example 4
The preparation method of this example is the same as that of example 1, except for the difference in components: 35 parts of cement, 47 parts of fly ash, 12 parts of silica fume, 18 parts of expanding agent, 30 parts of fine aggregate and 22 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.5 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 1.7 percent.
Example 5
The preparation method of the low-shrinkage cement-based repair material comprises the following steps of:
(1) dry-stirring 32 parts of cement, 27 parts of fly ash, 10 parts of silica fume, 10 parts of expanding agent and 28 parts of fine aggregate for 2min at the rotating speed of 120 r/min;
(2) dissolving 0.40 part of polycarboxylic acid water reducer in 18 parts of water, slowly adding 80 wt% of water reducer and water into the product obtained in the step (1), and stirring at the rotating speed of 120r/min for 4min to form uniform slurry;
(3) dispersing the stranded and agglomerated polyvinyl alcohol fibers into single fibers, adding the pre-dispersed polyvinyl alcohol fibers into the product obtained in the step (2), and stirring at the rotating speed of 280r/min for 3 min;
(4) and continuously adding the residual 20 wt% of water reducer and water, wet-stirring for 3min at the rotating speed of 280r/min, and uniformly stirring to obtain the low-shrinkage cement-based repair material.
Example 6
The preparation method of the low-shrinkage cement-based repair material comprises the following steps of:
(1) dry-stirring 42 parts of cement, 47 parts of fly ash, 14 parts of silica fume, 18 parts of expanding agent and 32 parts of fine aggregate at the rotating speed of 140r/min for 6 min;
(2) dissolving 0.85 part of polycarboxylic acid water reducer in 24 parts of water, slowly adding 85 wt% of water reducer and water into the product obtained in the step (1), and stirring at the rotating speed of 140r/min for 8min to form uniform slurry;
(3) dispersing the stranded and clustered polyvinyl alcohol fibers into single fibers, adding the pre-dispersed polyvinyl alcohol fibers into the product obtained in the step (2), and stirring at the rotating speed of 300r/min for 5 min;
(4) and continuously adding the rest 15 wt% of water reducing agent and water, wet-stirring at the rotating speed of 300r/min for 7min, and uniformly stirring to obtain the low-shrinkage cement-based repair material.
Example 7
The preparation method of the low-shrinkage cement-based repair material comprises the following steps of:
(1) dry-stirring 37 parts of cement, 37 parts of fly ash, 12 parts of silica fume, 14 parts of expanding agent and 30 parts of fine aggregate for 4min at the rotating speed of 130 r/min;
(2) dissolving 0.65 part of polycarboxylic acid water reducer in 21 parts of water, slowly adding 83 wt% of water reducer and water into the product obtained in the step (1), and stirring at the rotating speed of 130r/min for 6min to form uniform slurry;
(3) dispersing the stranded and clustered polyvinyl alcohol fibers into single fibers, adding the pre-dispersed polyvinyl alcohol fibers into the product obtained in the step (2), and stirring at the rotating speed of 290r/min for 4 min;
(4) and continuously adding the residual 17 wt% of water reducing agent and water, wet-stirring for 5min at the rotating speed of 290r/min, and uniformly stirring to obtain the low-shrinkage cement-based repair material.
Comparative example 1
The cement-based repair material comprises: 39 parts of cement, 27 parts of fly ash, 13 parts of silica fume, 0 part of expanding agent and 28 parts of fine aggregate and 24 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent. The preparation method and curing method are the same as those of example 1.
Comparative example 2
The cement-based repair material comprises: 39 parts of cement, 27 parts of fly ash, 0 part of silica fume, 14 parts of expanding agent and 28 parts of fine aggregate and 24 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent. The preparation method and curing method are the same as those of example 1.
A uniaxial tensile test is carried out on the dumbbell-shaped test pieces formed according to the mixing proportion, the preparation method and the curing system of the examples 1 to 4 and the comparative examples 1 to 2 by referring to JC/T2461-2018 'mechanical property test method of the high-ductility fiber reinforced cement-based composite material', and the ductility and the tensile strength of the dumbbell-shaped test pieces in the 28d age period are measured. Stress-strain curves of uniaxial tensile tests of examples 1 to 4 and comparative examples 1 to 2 are shown in FIG. 1, and specific values of uniaxial tensile ductility and strength are shown in Table 1.
A test piece of 40mm multiplied by 160mm formed according to the mixing proportion, the preparation method and the curing system of the embodiments 1 to 4 and the comparative examples 1 to 2 is subjected to a drying shrinkage performance test by referring to GB/T29417 and 2012, a test method for drying shrinkage cracking performance of cement mortar and concrete, and a drying shrinkage value within 90d age is measured. The change curves of the shrinkage on drying values with age of examples 1 to 4 and comparative examples 1 to 2 are shown in FIG. 2, and the specific shrinkage on drying values are shown in Table 1.
A test piece of phi 100mm multiplied by 50mm formed according to the mixing proportion, the preparation method and the curing system of the examples 1 to 4 and the comparative examples 1 to 2 is subjected to a chlorine ion permeation resistance test (rapid chloride ion migration coefficient method) by referring to GB/T50082-2009 Standard test method for testing the long-term performance and the durability of ordinary concrete, and the unsteady-state chloride ion migration coefficient of the 28d age is measured. The specific unsteady state chloride ion mobility coefficients of examples 1-4 and comparative examples 1-2 are shown in Table 1.
A cube compression strength test is carried out on a 100mm cube test piece formed according to the mixing proportion, the preparation method and the curing system of the examples 1 to 4 and the comparative examples 1 to 2 by referring to GB/T50081-2002 Standard of the test method for mechanical properties of ordinary concrete, and the cube compression strength of the concrete in the age of 28d is measured. Specific cube compressive strength values of examples 1-4 and comparative examples 1-2 are shown in Table 1.
Table 1 comparison of performance parameters of cement-based repair materials:
Figure BDA0002187901700000061
as can be seen from table 1: the uniaxial tensile ductility is not lower than 4% or the uniaxial tensile strength is not lower than 6MPa, and the phenomena of multi-crack cracking and strain hardening are obvious, namely the prepared cement-based repair material is a high-ductility cement-based repair material. The drying shrinkage values of the embodiments 1-4 tend to be stable in the testing age of 20d, and the drying shrinkage values are not more than 400 mu epsilon in the testing age of 90d, which is lower than the 1200-plus 1800 mu epsilon of the traditional engineering fiber reinforced cement-based material and lower than the 500-plus 900 mu epsilon of the common concrete, namely the prepared cement-based repair material is also a high-ductility low-shrinkage cement-based repair material. The unsteady state chloride ion migration coefficients of the embodiments 1-4 are not more than 1.5, namely, the prepared cement-based repair material is also a high-ductility low-shrinkage high-chloride ion-resistant cement-based repair material.

Claims (2)

1. The low-shrinkage cement-based repair material is characterized by comprising the following substances in parts by weight: 35 parts of cement, 47 parts of fly ash, 12 parts of silica fume, 18 parts of an expanding agent, 30 parts of fine aggregate and 22 parts of water; the mixing amount of the polycarboxylic acid water reducing agent is 0.5 percent of the total mass of the cement, the fly ash, the silica fume and the expanding agent, the total volume of the cement, the fly ash, the silica fume, the expanding agent, the fine aggregate, the water and the polycarboxylic acid water reducing agent after being uniformly mixed is taken as a base number, and the volume mixing amount of the polyvinyl alcohol fiber is 1.7 percent;
the expanding agent is a low-alkali type concrete expanding agent with 7d limited expansion rate more than or equal to 0.03% and alkali content less than or equal to 0.5% in water; the fine aggregate is 80-100 meshes of quartz sand; the density of the polyvinyl alcohol fiber is 1.3g/cm 3 The ultimate tensile strength is more than or equal to 1200MPa, the ultimate elongation is more than or equal to 8 percent, and the elastic modulus is 36-40 GPa;
the cement is P, II, 42.5 portland cement; the fly ash is I-grade fly ash; the loss on ignition of the silica fume is less than 6 percent, wherein the content of the silica is more than 85 percent, and the specific surface area is more than 15000m 2 /kg；
The uniaxial tensile ductility of the low-shrinkage cement-based repair material is 5.13%, the uniaxial tensile strength is 6.44 MPa, the dry shrinkage value is 230 mu epsilon, the unsteady state chloride ion migration coefficient is 1.26, and the actually measured compressive strength is 54.2 MPa.
2. The method for preparing a low shrinkage cement-based repair material according to claim 1, comprising the steps of:
(1) dry-stirring cement, fly ash, silica fume, an expanding agent and fine aggregates for 2min at the rotating speed of 140r/min, slowly adding 85 percent of water dissolved with all polycarboxylic acid water reducers, and wet-stirring for 4min at the rotating speed of 140 r/min;
(2) after uniform slurry is formed, pre-dispersed polyvinyl alcohol fiber is added, and wet stirring is carried out for 3min at the rotating speed of 280 r/min;
(3) after the fibers are uniformly dispersed, adding the rest 15 percent of water dissolved with all the polycarboxylic acid water reducing agents, and wet-stirring at the rotating speed of 280r/min for 3 min;
(4) and stirring uniformly to obtain the high-ductility low-shrinkage high-chlorine ion-resistant cement-based repair material.
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