CN116675505A - Self-repairable modified hydraulic lime cementing material and application thereof - Google Patents
Self-repairable modified hydraulic lime cementing material and application thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 119
- 239000004572 hydraulic lime Substances 0.000 title claims abstract description 102
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000010425 asbestos Substances 0.000 claims abstract description 34
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 34
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 28
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 28
- 239000004571 lime Substances 0.000 claims abstract description 28
- 239000000378 calcium silicate Substances 0.000 claims abstract description 27
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 27
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011449 brick Substances 0.000 claims abstract description 22
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 21
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 16
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 101100026375 Arabidopsis thaliana NHL2 gene Proteins 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 101100399296 Mus musculus Lime1 gene Proteins 0.000 claims 3
- 239000011469 building brick Substances 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- 239000002086 nanomaterial Substances 0.000 description 7
- 229920005646 polycarboxylate Polymers 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011431 lime mortar Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
-
- 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
Landscapes
- 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
A modified hydraulic lime cementing material capable of self-repairing and application thereof relate to a modified hydraulic lime cementing material and application thereof, and aim to solve the technical problem that the adhesion between a repair material and a brick masonry of the existing ancient building brick masonry is poor. The self-repairing modified hydraulic lime cementing material consists of nano silicon dioxide, hydraulic lime, calcium silicate whisker, nano kaolin, nano silica sol and asbestos. The lime material for repairing the brick masonry of the ancient building is prepared from the self-repairable modified hydraulic lime cementing material, a water reducing agent, water and sand, and has early compressive strength of 7.8-8.9 MPa and early tensile strength of 3.3-3.7 MPa after 28 days of maintenance, and can be used in the field of repairing the brick masonry of the ancient building.
Description
Technical Field
The invention relates to a modified hydraulic lime cementing material and application thereof, belonging to the field of lime materials in building materials.
Background
The Chinese history is long, and various ancient sites are not counted. Although the number of bricks is numerous, the difficulty of repairing ancient buildings is high, the preservation state of China is not ideal, and the brick masonry is easily influenced by outdoor environment changes, such as damage caused by weather influences of illumination, outdoor temperature, fog, rain, snow and the like; when the old brick masonry is repaired, the old wall skin is shoveled and then is required to be wetted by water, and when the wall body is not soaked, the white mortar wall skin is smeared, so that the wall skin is easy to fall off; after plastering, the lime mortar is plastered, as the original wall body is dry, the moisture of the contact surface of the wall skin and the wall body is absorbed by the dry wall body, and the moisture of the contact surface of the wall skin and the air is large, so that the internal and external moisture contents are different, the effect of adhesion is not achieved, the wall skin is caused to fall off, the original appearance and the appearance of the ancient building masonry are damaged, and the secondary damage of the ancient building is caused.
Disclosure of Invention
The invention aims to solve the technical problem that the adhesion between a repair material and a brick masonry is poor in the existing ancient building brick masonry, and provides a self-repairable modified hydraulic lime cementing material, and preparation and application thereof. According to the invention, the nano material is used for modifying the hydraulic lime cementing material, the mechanical property of the lime cementing material is improved by using asbestos fibers, so that the repair of the cement material of the brick masonry of the ancient building by the homologous material is realized, and the stability of the reinforced cement material is ensured. Meanwhile, abundant calcium ions, nano silicon dioxide and water in the modified cementing material are fully utilized to generate the hydrated calcium silicate cementing material, so that the modified hydraulic lime cementing material can self-repair cracks and defects of the cementing material, the durability of the modified cementing material is improved, the original construction process and building appearance of the ancient building masonry are protected, the safety of the ancient building is ensured, and the service life of the ancient building is prolonged.
The self-repairing modified hydraulic lime cementing material consists of nano silicon dioxide 6 wt%, hydraulic lime 83-85 wt%, calcium silicate whisker 2 wt%, nano kaolin 3 wt%, nano silica sol 3 wt% and asbestos 1-3 wt%.
More preferably, the nano silicon dioxide is hydrophilic gas phase nano silicon dioxide, the average grain diameter is 20-37 nm, and the mass fraction is 97%.
More preferably, the hydraulic lime is NHL2 according to European standard 459-1.
More preferably, the calcium silicate whisker is H-0020, the fiber diameter is D50:16-32 mu m, and the length-diameter ratio is (10-15): 1 and an acid-base number of 9.9.
More preferably, the asbestos is A1 grade nonflammable glass fiber with diameter of 0.02-30 micrometers and density of 2.5g/nm 3 The elastic modulus was 164.0GPa and the Poisson's ratio was 0.3.
More preferably, the asbestos is coiled, cut into square with the size of 6cm x 6cm, put into a small high-speed pulverizer to be pulverized for 15-20 s, and then crushed into wadding.
More preferably, the nano silica sol is ND-0101 type alkaline silica sol with the content of 30 percent, the particle size of 15+/-5 nm and the specific gravity of 1.0-1.2g/cm 3 The pH is between 8 and 10.
More preferably, the nano kaolin is calcined at 500-900 ℃, the specific surface area is 53-100 square meters per gram, and the thickness of the wafer is 30-50nm.
The application of the self-repairable modified hydraulic lime cementing material is that the material is used for preparing lime materials for repairing ancient building brick masonry.
The method for preparing the lime material for repairing the brick masonry of the ancient building by using the self-repairable modified hydraulic lime cementing material comprises the following steps of:
1. weighing a self-repairable modified hydraulic lime cementing material, a water reducing agent, water and sand;
wherein the self-repairable modified hydraulic lime cementing material is prepared by weighing 6 percent of nano silicon dioxide, 83 to 85 percent of hydraulic lime, 2 percent of calcium silicate whisker, 3 percent of nano kaolin, 3 percent of nano silica sol and 1 to 3 percent of asbestos according to the weight percentage;
the mass of the water reducing agent is 0.1 to 0.3 percent of modified hydraulic lime cementing material capable of self-repairing;
the mass ratio of water to the self-repairable modified hydraulic lime cementing material is 1: (0.5 to 0.6);
the mass ratio of the self-repairable modified hydraulic lime cementing material to sand is 1: (2.5-3.5);
2. dry mixing the hydraulic lime, calcium silicate whisker and asbestos weighed in the first step to obtain a ready-mixed material;
3. ultrasonically dispersing water, a water reducing agent, nano silica sol, nano kaolin and nano silicon dioxide to obtain mixing water;
4. mixing and stirring the ready-mixed material and the mixing water uniformly to obtain hydraulic lime clean slurry;
5. adding sand into the hydraulic lime paste, mixing and stirring to obtain the lime material for repairing the brick masonry of the ancient building.
More preferably, the water reducing agent in the step one is a polycarboxylate water reducing agent for improving the working performance of hydraulic lime.
More preferably, the sand in the first step is standard sand, the mesh size is 0.25-0.5 mm, and the grain size distribution meets the specification in the specification ISO R679-68.
More preferably, in the second step, the stirring speed of the dry mixing is 130-150 r/min, and the stirring time is 3-5 min.
More preferably, in the third step, the ultrasonic power of the ultrasonic dispersion is 600w, and the dispersion time is 15-20 min.
More preferably, in the third step, the mixing method of the mixing water comprises the steps of firstly uniformly mixing water and a water reducing agent, then adding nano silica sol, nano kaolin and nano silicon dioxide, and placing the mixture in an ultrasonic cleaner for uniformly mixing by ultrasonic vibration to obtain the mixing water.
More preferably, in the fourth step, the stirring speed of the mixing and stirring is 130-150 r/min, and the stirring time is 3-5 min.
More preferably, in the fifth step, the mixing and stirring are slow stirring and fast stirring, the stirring speed of the slow stirring is 130-150 r/min, the stirring time is 3-5 min, the stirring speed of the fast stirring is 270-290 r/min, and the stirring time is 3-5 min.
The invention adopts hydraulic lime as cementing material, and nano silicon dioxide, silica sol, nano kaolin, calcium silicate whisker and asbestos are doped as auxiliary cementing material, thus preparing the novel hydraulic lime cementing material, which has the following beneficial effects:
the hydraulic lime is used as the cementing material for repairing the brick masonry structure, and mainly because the hydraulic lime has the advantages of high setting speed, good cohesiveness, strong adhesive force, high water resistance and high mechanical property, the early failure risk of the pointing mortar exposed in a severe humid environment can be reduced to the minimum, and the capability of absorbing salt and water can be maintained, so that the characteristics are helpful for protecting the masonry from being damaged. And has the characteristics of good freezing resistance, alkali resistance, good flexibility, strong self-repairing capability and the like. Lime is used as a raw matrix material of the ancient building, but is not adopted, and lime is easy to hydrolyze, so that lime cementing materials are loose, disintegrated and destroyed; cement is not used as a cementing material of a brick masonry structure, and is high in early strength, so that the temperature difference between the inside and the outside of the structure is easily caused to be large, and the cement is easy to cause large internal stress, so that cracking is caused, and secondary damage is caused. Hydraulic lime is therefore a good choice as a new material for the protection of cultural relics.
When the cementing material is prepared, nano silicon dioxide is doped to carry out modification research on hydraulic lime. The purpose is to fully utilize abundant calcium ions in hydraulic lime and quicklime cementing material, add nano silicon dioxide in the cementing material, chemically react with the calcium ions to generate water-insoluble hydrated calcium silicate, reconstruct the microstructure in the lime cementing material to form the lime cementing material with wind resistance and hydrolysis resistance, thereby further improving the performance of the hydraulic lime and further improving the SiO in the nano kaolin 2 And Al 2 O 3 The nano material can be added into the gel material, so that the gel material not only can fill pores, but also can play a role of a catalyst, and can obviously reduce strength loss after freeze thawing cycle, and the nano material can also enhance the freezing resistance of the gel material by promoting the generation of C-S-H gel in a transition zone.
When the cementing material is prepared, the calcium silicate whisker is doped, the fiber structure with high length-diameter ratio of the whisker and stable chemical property can be utilized, the mechanical properties such as bending strength, hardness and the like of the hydraulic lime cementing material can be improved, the durability and chemical corrosion resistance of the hydraulic lime cementing material can also be improved, the production cost of the calcium silicate is low, the process is simplified, the manufacturing cost of the cementing material can be effectively reduced, and the final market competitiveness is improved.
When the cementing material is prepared, asbestos is doped, so that the freezing and thawing performance of the cementing material can be effectively improved, the probability of cracking of the material after freezing and thawing is reduced, and the asbestos has excellent heat preservation characteristics and is an ideal building heat preservation material.
In the preparation process, neither calcium silicate whisker nor asbestos reacts with water, and the calcium silicate whisker and asbestos are mixed with hydraulic lime in a dry mode in advance, so that materials can be uniformly mixed together, local dispersion is avoided, and the later-stage performance of the materials is affected.
In the preparation process, the polycarboxylate water reducer is fully mixed with water, then the nano silica sol, the nano kaolin and the nano silicon dioxide are added and put into an ultrasonic cleaner for ultrasonic vibration, and the dispersion effect, the lubrication effect and the cavitation effect generated by the ultrasonic vibration in the liquid of the polycarboxylate water reducer are utilized to effectively control the agglomeration effect of the nano material due to the large specific surface area of the nano material, so that the modification efficiency of the auxiliary cementing material is improved. Meanwhile, the polycarboxylate water reducer is doped, so that the mixing water consumption can be reduced, the water-cement ratio can be effectively controlled, and the working performance of the hydraulic lime cementing material can be improved. And the nano silicon dioxide particles can be grafted to the polycarboxylate water reducer molecules, so that the overall polymerization effect of the mixing water is good, and the rheological property and the workability of the material can be effectively improved.
The nano material is used for modifying the hydraulic lime cementing material, so that the repair of the homologous material to the ancient building is realized, the stability of the reinforced cementing material is ensured, the early compressive strength of the modified hydraulic lime cementing material for the brick masonry of the ancient building after 28 days of curing reaches 7.8-8.9 MPa, the early tensile strength reaches 3.3-3.7 MPa, the original construction process and building appearance of the brick masonry of the ancient building can be protected, the safety of the ancient building is ensured, the service life of the ancient building is prolonged, and the modified hydraulic lime cementing material for the brick masonry of the ancient building can be applied to the brick masonry structure of the ancient building.
Drawings
FIG. 1 is an analysis chart of X-ray diffraction tests of samples of example 3, comparative example 1, and comparative example 2;
FIG. 2 is an SEM image of a sample of example 2 cured 28 d;
FIG. 3 is an SEM image of a sample of comparative example 2 cured 28 d;
FIG. 4 is a graph showing the variation of lime samples during the water resistance test and freeze-thaw cycle.
Detailed Description
The beneficial effects of the present invention are further illustrated by the following examples.
Example 1: the method for preparing the lime material for repairing the brick masonry of the ancient building by using the self-repairable modified hydraulic lime cementing material comprises the following steps of:
1. weighing a self-repairable modified hydraulic lime cementing material, a water reducing agent, tap water and standard sand;
wherein the self-repairable modified hydraulic lime cementing material is prepared by weighing 6% of nano silicon dioxide, 3% of nano silica sol, 3% of nano kaolin, 85% of hydraulic lime, 2% of calcium silicate whisker and 1% of asbestos according to the weight percentage;
the mass of the water reducing agent is 0.2% of that of the modified hydraulic lime cementing material;
the mass ratio of the tap water to the modified hydraulic lime cementing material is 1:0.55;
the mass ratio of the modified hydraulic lime cementing material to sand is 1:3, a step of;
the nano silicon dioxide is hydrophilic gas phase nano SiO 2 The diameter is between 20 and 37nm, and the specific surface area is between 180 and 200m 2 Between/g, the mass fraction is 99%;
the hydraulic lime is NHL2 hydraulic lime, the 28-day compressive strength of the NHL2 hydraulic lime is between 2 and 7MPa, the initial setting time is 250min, and the stability is 0.3mm;
the calcium silicate whisker is AH-0020 type calcium silicate whisker produced by Jiangxi whetstone mineral fiber technology Co, the whiteness is 90, the fiber diameter is D50:16-32 mu m, and the length-diameter ratio is 10:1-15:1, molecular weight 116, pH 9.9;
the asbestos is A1 grade nonflammable glass fiber; asbestos with a bulk density of 30kg/m 3 Cutting the rolled material into square with the length of 6cm and the diameter of 6.5-7 mu m, putting the square into a small high-speed pulverizer to pulverize for 20s, and crushing the square into a wadding shape with the length of 0.1-0.13 mm;
the nanometer silica sol is ND-0101 alkaline silica sol with content of 30%, particle diameter of 15+ -5 nm and specific gravity of 1.0-1.2g/cm 3 The pH is between 8 and 10;
the nano kaolin is prepared by calcining at 500-900 ℃, the specific surface area is 53-100 square meters per gram, and the thickness of a wafer is 30-50nm;
the water reducer is a polycarboxylate water reducer;
the standard sand has a screen aperture of 0.25-0.5 mm, the grain composition meets the specification in the specification ISO R679-68, the fineness modulus of the standard sand is middle-region middle-sand, and the grain composition is middle-region 3.0;
2. adding the hydraulic lime, the calcium silicate whisker and the asbestos weighed in the first step into a JJ-5 cement mortar stirrer, and mixing and stirring for 180 seconds at the speed of 140r/min to obtain a ready-mixed material;
3. stirring tap water and a water reducing agent weighed in the first step, uniformly mixing, adding nano silicon dioxide, nano silica sol and nano kaolin, and then carrying out ultrasonic vibration by using a GTSONIC-P type ultrasonic cleaner; the ultrasonic power of ultrasonic dispersion is 600w, and the dispersion time is 15min, so as to obtain mixing water;
4. and (3) adding the mixing water obtained in the step (III) into the ready-mixed material obtained in the step (II), wherein the mixing speed of mixing and stirring is 150r/min, and the stirring time is 3min, so as to obtain the hydraulic lime clean slurry.
5. Adding standard sand into hydraulic lime paste, firstly stirring slowly, wherein the stirring speed of the slow stirring is 130r/min, the stirring time is 5min, and then stirring rapidly, wherein the stirring speed of the rapid stirring is 290r/min, and the stirring time is 5min, so as to obtain the lime material for repairing the brick masonry of the ancient building.
Example 2: this example differs from example 1 in that the self-healing modified hydraulic lime gelling material is prepared by weighing, in weight percent, 6% nanosilica, 3% nanosilica sol, 3% nanokaolin, 84% hydraulic lime, 2% calcium silicate whiskers and 2% asbestos; otherwise, the same as in example 1 was used.
Example 3: this example differs from example 1 in that the self-repairable modified hydraulic lime cement is a self-repairable modified hydraulic lime cement comprising, by weight, 6% nanosilica, 3% nanosilica sol, 3% nanokaolin, 83% hydraulic lime, 2% calcium silicate whiskers, and 3% asbestos; otherwise, the same as in example 1 was used.
Comparative example 1: this comparative example differs from example 1 in that the hydraulic lime gelling material is prepared by weighing, in weight percent, 6% nanosilica, 3% nanosilica sol, 3% nanokaolin, 86% hydraulic lime, 2% calcium silicate whiskers; otherwise, the same as in example 1 was used. The hydraulic lime cement of this example does not incorporate asbestos.
Comparative example 2: this comparative example differs from example 1 in that the hydraulic lime gelling material is prepared by weighing, in weight percent, 6% nanosilica, 3% nanosilica sol, 3% nanokaolin, 86% hydraulic lime and 2% calcium silicate whiskers; otherwise, the same as in example 1 was used. Asbestos and calcium silicate whiskers were not added to the hydraulic lime cement of this example.
The lime material for repairing the ancient building brick masonry of example 3, the lime material of comparative example 1 and the lime material of comparative example 2 are subjected to X-ray diffraction test analysis, and XRD spectra of the obtained lime materials are shown in figure 1, and as can be seen from figure 1, calcium silicate whiskers and asbestos hardly participate in the reaction in the sample, but in the whole formula, C-S-H gel is increased along with the addition of nano materials, and the content of calcium hydroxide is reduced, which is why the whole mechanical strength is improved.
FIG. 2 is an SEM image of the lime material curing 28d of example 2 for repairing a historic building brickwork; fig. 3 is an SEM scanning electron microscope image of the lime material curing 28d of comparative example 2, and it is apparent from comparison of fig. 2 and 3 that, after addition of asbestos fibers, the asbestos fibers in the sample and the hydraulic lime slurry are cured by physical changes to form a fixed interface layer, and stress is transferred through the interface layer, and the asbestos fibers take the form of tree roots in the matrix and can cross microcracks in the hydraulic lime to play a bridging role, so that the improvement in flexural strength is large.
The lime materials for repairing the ancient brick masonry prepared in examples 1 to 3 and the lime materials prepared in comparative examples 1 to 2 were subjected to early compressive strength and early flexural strength tests, and the results are shown in Table 1. Wherein, the test standard of compressive strength and flexural strength is referred to the method for testing cement mortar strength (ISO method) (GB/T17671-1999).
TABLE 1 results of Performance test of lime materials obtained in examples 1 to 3 and comparative examples 1 to 2
By comparing the test results of the samples cured for 28d in examples 1-3 and comparative example 1 and comparative example 2, it can be seen that the mechanical properties are obviously improved after asbestos is added, and the mechanical properties of hydraulic lime can be well improved by adding the hydraulic lime-based material mainly because of the characteristics of good fiber dispersion and easy mixing. The mixing amount of the asbestos fiber is within the range of 1-3%, and the cohesive force and the internal friction angle of the cementing material test block are increased to different degrees. The cementing effect of calcium silicate hydrate can raise the adhesion and friction between asbestos fiber, whisker and hydraulic lime particle. In a certain range, the proper increase of the fiber blending amount, the stronger the interaction between the fiber and the hydraulic lime, the better the reinforcement effect can be exerted in the hydraulic lime cementing material. The asbestos fiber and whisker can be used in combination with hydraulic lime and nano silica to obviously improve the strength and strain characteristics of the hydraulic lime material during damage, improve the brittle failure mode of the hydraulic lime material and greatly improve the tensile strength. In the contact and infiltration process of hydraulic lime slurry and asbestos fibers and whiskers, the matrix and fiber composite body is solidified through physical or chemical change to form a fixed interface layer, the interface enables the fibers and the matrix to form a whole body, stress is transferred through the interface layer, a complete interface layer is formed in the composite body, and the frictional resistance among the fibers can obviously improve the strength value of the cementing material.
The lime materials prepared in examples 1 to 3 and the lime materials prepared in comparative examples 1 to 2 for repairing ancient building brickwork were subjected to durability tests including a water resistance test and a freeze thawing test. The water resistance test is that the composite modified hydraulic lime of curing 28d is a 40mm multiplied by 160mm sample, soaked in free water at room temperature, changed water every day during the experiment, and the water resistance of the hydraulic lime is shown in table 2.
Table 2 test results of mechanical properties of mortar samples before and after the Water resistance test
As shown in figure 4, the test results show that the durability of the modified hydraulic lime cementing material is obviously improved, the modified hydraulic lime cementing material can effectively resist water erosion, has high freezing resistance and has great significance for self-repairing of ancient buildings.
Claims (10)
1. The self-repairing modified hydraulic lime cementing material is characterized by comprising, by weight, 6% of nano silicon dioxide, 83% -85% of hydraulic lime, 2% of calcium silicate whiskers, 3% of nano kaolin, 3% of nano silica sol and 1% -3% of asbestos.
2. The self-repairing modified hydraulic lime gel material according to claim 1, wherein the nano silicon dioxide is hydrophilic gas phase nano silicon dioxide, the average particle size is 20-37 nm, and the mass fraction is 97%.
3. A modified hydraulic lime binding material capable of self-repairing according to claim 1 or 2, wherein the hydraulic lime is NHL2 according to european standard 459-1.
4. The self-repairing modified hydraulic lime gelling material according to claim 1 or 2, wherein the calcium silicate whisker is H-0020, the fiber diameter is d50:16-32 μm, and the aspect ratio is (10-15): 1 and an acid-base number of 9.9.
5. A self-repairing modified hydraulic lime cement according to claim 1 or 2, wherein the asbestos is A1-grade non-combustible glass fibre having a diameter of 0.02-30 microns and a density of 2.5g/nm 3 The elastic modulus was 164.0GPa and the Poisson's ratio was 0.3.
6. The self-repairing modified hydraulic lime-based cement according to claim 1 or 2, wherein the asbestos is rolled, cut into square 6cm x 6cm, and crushed for 15-20 s in a small high-speed crusher to form a wadding.
7. The self-repairing modified hydraulic lime gel material according to claim 1 or 2, wherein the nano silica sol is ND-0101 type alkaline silica sol with a content of 30%, a particle size of 15+ -5 nm and a specific gravity of 1.0-1.2g/cm 3 The pH is between 8 and 10.
8. The self-repairing modified hydraulic lime gel material according to claim 1 or 2, wherein the nano kaolin is calcined at 500-900 ℃, the specific surface area is 53-100 square meters/g, and the wafer thickness is 30-50nm.
9. The use of a self-repairing modified hydraulic lime binding material according to claim 1 for the preparation of lime material for repairing ancient brick masonry.
10. Use of a self-repairable modified hydraulic lime cement according to claim 9, characterized in that the method for preparing lime material for repairing ancient brick masonry using self-repairable modified hydraulic lime cement is carried out by the following steps:
1. weighing a self-repairable modified hydraulic lime cementing material, a water reducing agent, water and sand;
wherein the self-repairable modified hydraulic lime cementing material is prepared by weighing 6 percent of nano silicon dioxide, 83 to 85 percent of hydraulic lime, 2 percent of calcium silicate whisker, 3 percent of nano kaolin, 3 percent of nano silica sol and 1 to 3 percent of asbestos according to the weight percentage;
the mass of the water reducing agent is 0.1 to 0.3 percent of modified hydraulic lime cementing material capable of self-repairing;
the mass ratio of water to the self-repairable modified hydraulic lime cementing material is 1: (0.5 to 0.6);
the mass ratio of the self-repairable modified hydraulic lime cementing material to sand is 1: (2.5-3.5);
2. dry mixing the hydraulic lime, calcium silicate whisker and asbestos weighed in the first step to obtain a ready-mixed material;
3. ultrasonically dispersing water, a water reducing agent, nano silica sol, nano kaolin and nano silicon dioxide to obtain mixing water;
4. mixing and stirring the ready-mixed material and the mixing water uniformly to obtain hydraulic lime clean slurry;
5. adding sand into the hydraulic lime paste, mixing and stirring to obtain the lime material for repairing the brick masonry of the ancient building.
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