CN115093180A - Anti-freezing type non-shrinkage grouting material and preparation method thereof - Google Patents
Anti-freezing type non-shrinkage grouting material and preparation method thereof Download PDFInfo
- Publication number
- CN115093180A CN115093180A CN202210767898.XA CN202210767898A CN115093180A CN 115093180 A CN115093180 A CN 115093180A CN 202210767898 A CN202210767898 A CN 202210767898A CN 115093180 A CN115093180 A CN 115093180A
- Authority
- CN
- China
- Prior art keywords
- aggregate
- grouting material
- air
- water
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C04B28/04—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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/148—Aluminium-sulfate
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to the technical field of anti-freezing grouting materials, and discloses an anti-freezing non-shrinkage grouting material which comprises the following raw materials in parts by weight: 23% of gel material, 22% of aggregate, 10% of defoaming agent, 8% of fibroin spun fiber, 7% of silica fume, 10% of air entraining agent and 20% of polymer. The antifreezing non-shrinkage grouting material is prepared by mixing and adding a gel material, aggregate, a defoaming agent, fibroin spun fiber, silica fume and an air entraining agent, controlling the water-to-gel ratio to be 0.4-0.55 during proportioning, controlling the air content, improving the antifreezing effect of the grouting material through more air contents, simultaneously integrally improving the antifreezing effect of the grouting material through selection of the variety of the aggregate, control of the water-to-gel ratio, intake of the air content and control of the air bubble spacing, drying the aggregate in advance before preparation, controlling the water saturation of the aggregate and the coefficient of the air bubble spacing, and simultaneously adding the silica fume and the air entraining agent during stirring to improve the antifreezing effect of the grouting material.
Description
Technical Field
The invention relates to the technical field of anti-freezing grouting materials, in particular to an anti-freezing non-shrinkage grouting material and a preparation method thereof.
Background
As is well known, cement mortar is used as a composite material, an interface transition area between aggregate and a cement base is a weak link of the material, the interface transition area has high water-cement ratio, large porosity, more calcium hydroxide and ettringite, large crystal grains and large calcium hydroxide crystal oriented growth, the structure and the property of the interface transition area need to be improved to improve the performance of the cement base material, and the modification effect of a polymer on the cement mortar is also the interface transition area of the material, so that the material obtains the performance which is not possessed by other materials.
At present, the antifreezing grouting material can be frozen at low temperature, the cracking of the fluidity can be greatly reduced, the later-stage solidification is not compact, and the traditional grouting material cannot meet the requirements of a construction party on the antifreezing problem, so that the reworking and the repairing are common.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the anti-freezing type shrinkage-free grouting material and the preparation method thereof, which have the advantages of improving the anti-freezing effect and the like, and solve the problems that the grouting material of the existing anti-freezing type grouting material is likely to be frozen at low temperature, the fluidity is greatly reduced, the grouting material is cracked, the later solidification is not compact and the like, and the traditional grouting material cannot meet the requirements of a construction party on the anti-freezing problem, so that rework and repair become common problems.
(II) technical scheme
In order to achieve the aim of improving the anti-freezing effect, the invention provides the following technical scheme: an anti-freezing type non-shrinkage grouting material comprises the following raw materials in parts by weight: 23% of gel material, 22% of aggregate, 10% of defoaming agent, 8% of fibroin spun fiber, 7% of silica fume, 10% of air entraining agent and 20% of polymer.
Preferably, the aggregate comprises coarse aggregate and fine aggregate, the fine aggregate is natural river sand, the particle size of the fine aggregate is 2.7-3.1mm, and the coarse aggregate is granite and the particle size is not larger than 25 mm.
Preferably, the water-to-glue ratio is between 0.4 and 0.55.
Preferably, the gel material is portland cement, and the spacing coefficient of the bubbles is 500 μm.
The invention aims to solve another technical problem of providing a preparation method of the anti-freezing type non-shrinkage grouting material, which comprises the following steps:
1) selecting materials, wherein the variety of the gel material is selected from portland cement, and the larger the water-gel ratio is, the more the content of the freezable water in the grouting material is, and the higher the freezing speed of the grouting material is; the worse the bubble structure, the larger the average bubble pitch; the lower the strength of the grouting material is, the poorer the freeze-thaw resistance is, and the frost resistance of the grouting material is improved by controlling the water-gel ratio during proportioning;
2) controlling gas during proportioning, wherein the gas content during proportioning is as follows: in a certain range, the lower the temperature is, the more the air content is, the better the frost resistance of the grouting material is, the air content is in direct proportion to the doping amount of the air entraining agent, when the air content is more than 6%, the air content exceeds a certain range, the frost resistance of the grouting material is rather poor, and the air content is increased; the forced mixer is easier to bleed than the free-fall mixer, and the large mixer is easier to bleed than the small mixer;
3) during preparation, the cement strength is that when hydrostatic pressure and osmotic pressure exceed the tensile strength of the grouting material, the grouting material generates freeze-thaw damage, so that the strength of the grouting material for representing the capability of resisting the freeze-thaw damage also influences the frost resistance of the grouting material;
4) when the aggregate is proportioned, when the aggregate absorbs water and is saturated, static pressure is generated in the pores of the aggregate and the interface of the aggregate-cement paste after being frozen, and freezing damage is generated when the strength of the aggregate or the interface is exceeded;
5) therefore, when stirring and proportioning are carried out, the water absorption rate of the aggregate and the size of the aggregate are controlled, the aggregate is generally produced by a wet method, namely, a large amount of water is adopted to flush the aggregate in the production process of machine-made sand, a method combining mechanical dehydration and natural dehydration is adopted to reduce the water content to be within a specified range and to be stable, the water content of the aggregate is directly related to the weather condition, and the water content of the aggregate can be directly measured by a special instrument by utilizing a microwave humidity measurement technology;
6) average bubble spacing upon stirring: the larger the average bubble spacing is, the larger the hydrostatic pressure and osmotic pressure in capillary pores in the freeze-thawing process are, and the lower the frost resistance of the grouting material is; the high-frost-resistance grouting material can be obtained when the average bubble spacing coefficient is below 500 mu m;
7) during preparation, gel materials, aggregates, defoaming agents, fibroin spun fibers, silica fume and air entraining agents are crushed and mixed to prepare grouting materials, the aggregates are dried in advance before preparation, the frost resistance effect of the grouting materials is improved by controlling the water absorption saturation of the aggregates and the coefficient of air bubble spacing, and simultaneously the silica fume and the air entraining agents are added during stirring, the air entraining agents can improve the workability, water retention property and cohesiveness of concrete mixtures and improve the fluidity of concrete, a large amount of additives of uniformly distributed, closed and stable micro air bubbles are introduced during the mixing process of the concrete mixtures, so that the frost resistance working performance of the fresh concrete grouting materials is improved, the fibroin spun fiber structures are packaged with air by a plurality of small holes, air is static, thermal convection cannot be generated, heat loss is reduced, and simultaneously due to the particularity of polymers, it will coagulate into film at the temperature higher than its lowest film-forming temperature, the film formed can surround the calcium hydroxide that the cement hydrates and produces, link into a whole, can reduce the bad influence on durability of the material of calcium hydroxide effectively, on the other hand the ettringite in the polymer mortar is shorter and coarser than the ettringite in the ordinary mortar, further observe and find the addition of polymer has improved the pore structure of the mortar effectively, because of morphological effect and its own particularity of polymer, have played effects such as cementation, pack, etc., make the average pore diameter of the mortar diminish, the macropore becomes the micropore, the uniformity of pore distribution is reduced, the microporosity is improved, because the course of film-forming of polymer takes place in the course of cement hydration, the water is used for hydrating and is evaporated, the polymer forms a tough, dense network film-like network structure in the whole basal body, the polymer is distributed between cement mortar frameworks to fill gaps, so that a channel with the outside is cut off, the performance of the material is further improved, and most of the polymer can improve the flowing performance of the mortar due to the water building effect of the polymer.
(III) advantageous effects
Compared with the prior art, the invention provides an anti-freezing type shrinkage-free grouting material and a preparation method thereof, and the anti-freezing type shrinkage-free grouting material has the following beneficial effects:
the antifreezing non-shrinkage grouting material and the preparation method thereof are characterized in that gel materials, aggregates, defoaming agents, fibroin spun fibers, silica fume, air entraining agents and polymers are added for mixing configuration, the water-to-gel ratio is controlled to be between 0.4 and 0.55 during proportioning, the air content is controlled, the antifreezing effect of the grouting material is improved through more air contents, the antifreezing effect of the grouting material is integrally improved through selection of the varieties of the aggregates, control of the water-to-gel ratio, intake of the air content and control of the air bubble spacing, during preparation, the gel materials, the aggregates, the defoaming agents, the fibroin spun fibers, the silica fume and the air entraining agents are crushed and mixed to prepare the grouting material, the aggregates are dried in advance before preparation, the antifreezing effect of the grouting material is improved through control of the water saturation coefficient of the aggregates and the air bubble spacing coefficient, and the silica fume and the air entraining agents are added during stirring, the polymer can reduce the average pore diameter of the mortar, change large pores into small pores, reduce the uniformity of pore distribution, improve the microporosity, solve the problems that the grouting material of the prior antifreezing grouting material can be frozen at low temperature, greatly reduce the fluidity, crack, and be solidified in later period and not compact, and the traditional grouting material can not meet the requirements of construction parties in terms of antifreezing, so that the reworking and repairing become common problems.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: an anti-freezing type non-shrinkage grouting material comprises the following raw materials in parts by weight: the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent, wherein the aggregate comprises coarse aggregate and fine aggregate, the fine aggregate is natural river sand, the particle size of the fine aggregate is 2.70.4, the coarse aggregate is granite, the particle size is not more than 25mm, the water-glue ratio is 0.4, and the proportion of the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent is 23: 22: 10: 8: 7:10:20, the gel material is portland cement, and the spacing coefficient of the air bubbles is 500 mu m.
The preparation method of the anti-freezing type shrinkage-free grouting material comprises the following steps:
1) selecting materials, wherein the variety of the gel material is selected from portland cement, and the larger the water-gel ratio is, the more the content of the freezable water in the grouting material is, and the higher the freezing speed of the grouting material is; the worse the bubble structure, the larger the average bubble pitch; the lower the strength of the grouting material is, the poorer the freeze-thaw resistance is, and the frost resistance of the grouting material is improved by controlling the water-gel ratio during proportioning;
2) controlling gas during proportioning, wherein the gas content during proportioning is as follows: in a certain range, the lower the temperature is, the more the air content is, the better the frost resistance of the grouting material is, the air content is in direct proportion to the doping amount of the air entraining agent, when the air content is more than 6%, the air content exceeds a certain range, the frost resistance of the grouting material is poor, and the air content is increased; the forced mixer is easier to bleed than the free-fall mixer, and the big mixer is easier to bleed than the small mixer;
3) during preparation, the cement strength is that when hydrostatic pressure and osmotic pressure exceed the tensile strength of the grouting material, the grouting material generates freeze-thaw damage, so that the strength of the grouting material for representing the capability of resisting the freeze-thaw damage also influences the frost resistance of the grouting material;
4) when the aggregate is proportioned, when the aggregate absorbs water and is saturated, static pressure is generated in the pores of the aggregate and the interface of the aggregate-cement paste after being frozen, and freezing damage is generated when the strength of the aggregate or the interface is exceeded;
5) therefore, when stirring and proportioning are carried out, the water absorption rate and the size of the aggregate are controlled, the aggregate is generally produced by a wet method, namely, a large amount of water is adopted to flush the aggregate in the production process of machine-made sand, in order to reduce the water content to be within a specified range and be stable, a method combining mechanical dehydration and natural dehydration is adopted, the water content of the aggregate is directly related to weather conditions, and the water content of the aggregate can be directly measured by a special instrument by utilizing a microwave humidity measuring technology
6) Average bubble spacing upon stirring: the larger the average bubble spacing is, the larger the hydrostatic pressure and osmotic pressure in capillary pores in the freeze-thawing process are, and the lower the frost resistance of the grouting material is; the high-frost-resistance grouting material can be obtained when the average bubble spacing coefficient is below 500 mu m;
7) during preparation, gel materials, aggregates, defoaming agents, fibroin spun fibers, silica fume, air entraining agents and polymers are crushed and mixed to prepare grouting materials, the aggregates are dried in advance before preparation, the silica fume and the air entraining agents are added during stirring to improve the frost resisting effect of the grouting materials through controlling the water absorption saturation of the aggregates and the coefficient of the air bubble spacing, the air entraining agents can improve the workability, water retention and cohesiveness of concrete mixtures and improve the fluidity of the concrete, a large amount of additives of uniformly distributed, closed and stable micro air bubbles are introduced during the mixing process of the concrete mixtures, so that the frost resisting working performance of the fresh concrete grouting materials is improved, the fibroin spun fiber structures are packaged with air by a plurality of small holes, the air is static, the thermal convection cannot be generated, the heat loss is reduced, and simultaneously due to the particularity of the polymers, it will agglomerate and form membrane at the temperature higher than its lowest membrane-forming temperature, the membrane formed can surround the calcium hydroxide produced by cement hydration, connect into a whole, can reduce the bad influence of calcium hydroxide on the durability of the material effectively, on the other hand, the ettringite in the polymer mortar is shorter and coarser than the ettringite in the ordinary mortar, further observe and find that the addition of polymer has improved the pore structure of the mortar effectively, because of the morphological effect and its own particularity of the polymer, the functions of cementation, filling, etc. are played, the average pore diameter of the mortar is reduced, the macropore is reduced to be small pore, the uniformity of pore distribution is reduced, the microporosity is improved, because the process of polymer membrane-forming takes place in the course of cement hydration, the water is used for hydration and is evaporated, the polymer forms a tough and compact network film-like network structure in the whole basal body, the polymer is distributed among cement mortar frameworks to fill gaps, so that a channel with the outside is cut off, the performance of the material is further improved, and most of the polymer can improve the flowing performance of the mortar due to the water building effect of the polymer.
The second embodiment: an anti-freezing type non-shrinkage grouting material comprises the following raw materials in parts by weight: the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent, wherein the aggregate comprises coarse aggregate and fine aggregate, the fine aggregate is natural river sand, the particle size of the fine aggregate is 2.9mm, the coarse aggregate is granite, the particle size is not larger than 20mm, the water-glue ratio is 0.5, and the proportion of the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent is 15: 20: 5:15: 15:15:15, the gel material is portland cement, and the spacing coefficient of the air bubbles is 500 mu m.
The preparation method of the anti-freezing type shrinkage-free grouting material comprises the following steps:
1) selecting materials, wherein the variety of the gel material is selected from portland cement, and the larger the water-gel ratio is, the more the content of the freezable water in the grouting material is, and the higher the freezing speed of the grouting material is; the worse the bubble structure, the larger the average bubble pitch; the lower the strength of the grouting material is, the poorer the freeze-thaw resistance is, and the frost resistance of the grouting material is improved by controlling the water-gel ratio during proportioning;
2) controlling gas during proportioning, wherein the gas content during proportioning is as follows: in a certain range, the lower the temperature is, the more the air content is, the better the frost resistance of the grouting material is, the air content is in direct proportion to the doping amount of the air entraining agent, when the air content is more than 6%, the air content exceeds a certain range, the frost resistance of the grouting material is poor, and the air content is increased; the forced mixer is easier to bleed than the free-fall mixer, and the large mixer is easier to bleed than the small mixer;
3) during preparation, the cement strength is that when hydrostatic pressure and osmotic pressure exceed the tensile strength of the grouting material, the grouting material generates freeze-thaw damage, so that the strength of the grouting material for representing the capability of resisting the freeze-thaw damage also influences the frost resistance of the grouting material;
4) when the aggregate is proportioned, when the aggregate absorbs water and is saturated, static pressure is generated in the pores of the aggregate and the interface of the aggregate-cement paste after being frozen, and freezing damage is generated when the strength of the aggregate or the interface is exceeded;
5) therefore, when stirring and proportioning are carried out, the water absorption rate of the aggregate and the size of the aggregate are controlled, the aggregate is generally produced by a wet method, namely, a large amount of water is adopted to flush the aggregate in the production process of machine-made sand, a method combining mechanical dehydration and natural dehydration is adopted to reduce the water content to be within a specified range and to be stable, the water content of the aggregate is directly related to the weather condition, and the water content of the aggregate can be directly measured by a special instrument by utilizing a microwave humidity measurement technology;
6) average bubble spacing upon stirring: the larger the average bubble spacing is, the larger the hydrostatic pressure and osmotic pressure in capillary pores in the freeze-thawing process are, and the lower the frost resistance of the grouting material is; the high frost-resistant grouting material can be obtained when the average bubble spacing coefficient is below 500 mu m;
7) during preparation, gel materials, aggregates, defoaming agents, fibroin spun fibers, silica fume, air entraining agents and polymers are crushed and mixed to prepare grouting materials, the aggregates are dried in advance before preparation, the silica fume and the air entraining agents are added during stirring to improve the frost resisting effect of the grouting materials through controlling the water absorption saturation of the aggregates and the coefficient of the air bubble spacing, the air entraining agents can improve the workability, water retention and cohesiveness of concrete mixtures and improve the fluidity of the concrete, a large amount of additives of uniformly distributed, closed and stable micro air bubbles are introduced during the mixing process of the concrete mixtures, so that the frost resisting working performance of the fresh concrete grouting materials is improved, the fibroin spun fiber structures are packaged with air by a plurality of small holes, the air is static, the thermal convection cannot be generated, the heat loss is reduced, and simultaneously due to the particularity of the polymers, it will agglomerate and form membrane at the temperature higher than its lowest membrane-forming temperature, the membrane formed can surround the calcium hydroxide produced by cement hydration, connect into a whole, can reduce the bad influence of calcium hydroxide on the durability of the material effectively, on the other hand, the ettringite in the polymer mortar is shorter and coarser than the ettringite in the ordinary mortar, further observe and find that the addition of polymer has improved the pore structure of the mortar effectively, because of the morphological effect and its own particularity of the polymer, the functions of cementation, filling, etc. are played, the average pore diameter of the mortar is reduced, the macropore is reduced to be small pore, the uniformity of pore distribution is reduced, the microporosity is improved, because the process of polymer membrane-forming takes place in the course of cement hydration, the water is used for hydration and is evaporated, the polymer forms a tough and compact network film-like network structure in the whole basal body, the polymer is distributed among cement mortar frameworks to fill gaps, so that a channel with the outside is cut off, the performance of the material is further improved, and most of the polymer can improve the flowing performance of the mortar due to the water building effect of the polymer.
Example three: an anti-freezing type non-shrinkage grouting material comprises the following raw materials in parts by weight: the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent, wherein the aggregate comprises coarse aggregate and fine aggregate, the fine aggregate is natural river sand, the particle size of the fine aggregate is 3.1, the coarse aggregate is granite, the particle size is not larger than 15mm, the water-glue ratio is 0.55, and the ratio of the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent is 10: 10: 20: 20: 20:10:10, the gel material is portland cement, and the spacing coefficient of the air bubbles is 500 mu m.
The preparation method of the anti-freezing type shrinkage-free grouting material comprises the following steps:
1) selecting materials, wherein the variety of the gel material is selected from portland cement, and the larger the water-gel ratio is, the more the content of the freezable water in the grouting material is, and the higher the freezing speed of the grouting material is; the worse the bubble structure, the larger the average bubble pitch; the lower the strength of the grouting material is, the poorer the freeze-thaw resistance is, and the frost resistance of the grouting material is improved by controlling the water-gel ratio during proportioning;
2) controlling gas during proportioning, wherein the gas content during proportioning is as follows: in a certain range, the lower the temperature is, the more the air content is, the better the frost resistance of the grouting material is, the air content is in direct proportion to the doping amount of the air entraining agent, when the air content is more than 6%, the air content exceeds a certain range, the frost resistance of the grouting material is poor, and the air content is increased; the forced mixer is easier to bleed than the free-fall mixer, and the big mixer is easier to bleed than the small mixer;
3) during preparation, the cement strength is that when hydrostatic pressure and osmotic pressure exceed the tensile strength of the grouting material, the grouting material generates freeze-thaw damage, so that the strength of the grouting material for representing the capability of resisting the freeze-thaw damage also influences the frost resistance of the grouting material;
4) when the aggregate is proportioned, when the aggregate absorbs water and is saturated, static pressure is generated in the pores of the aggregate and the interface of the aggregate-cement paste after being frozen, and freezing damage is generated when the strength of the aggregate or the interface is exceeded;
5) therefore, when stirring and proportioning are carried out, the water absorption rate of the aggregate and the size of the aggregate are controlled, the aggregate is generally produced by a wet method, namely, a large amount of water is adopted to flush the aggregate in the production process of machine-made sand, a method combining mechanical dehydration and natural dehydration is adopted to reduce the water content to be within a specified range and to be stable, the water content of the aggregate is directly related to the weather condition, and the water content of the aggregate can be directly measured by a special instrument by utilizing a microwave humidity measurement technology;
6) average bubble spacing upon stirring: the larger the average bubble spacing is, the larger the hydrostatic pressure and osmotic pressure in capillary pores in the freeze-thawing process are, and the lower the frost resistance of the grouting material is; the high frost-resistant grouting material can be obtained when the average bubble spacing coefficient is below 500 mu m;
7) during preparation, gel materials, aggregates, defoaming agents, fibroin spun fibers, silica fume, air entraining agents and polymers are crushed and mixed to prepare grouting materials, the aggregates are dried in advance before preparation, the silica fume and the air entraining agents are added during stirring to improve the frost resisting effect of the grouting materials through controlling the water absorption saturation of the aggregates and the coefficient of the air bubble spacing, the air entraining agents can improve the workability, water retention and cohesiveness of concrete mixtures and improve the fluidity of the concrete, a large amount of additives of uniformly distributed, closed and stable micro air bubbles are introduced during the mixing process of the concrete mixtures, so that the frost resisting working performance of the fresh concrete grouting materials is improved, the fibroin spun fiber structures are packaged with air by a plurality of small holes, the air is static, the thermal convection cannot be generated, the heat loss is reduced, and simultaneously due to the particularity of the polymers, it will agglomerate and form membrane at the temperature higher than its lowest membrane-forming temperature, the membrane formed can surround the calcium hydroxide produced by cement hydration, connect into a whole, can reduce the bad influence of calcium hydroxide on the durability of the material effectively, on the other hand, the ettringite in the polymer mortar is shorter and coarser than the ettringite in the ordinary mortar, further observe and find that the addition of polymer has improved the pore structure of the mortar effectively, because of the morphological effect and its own particularity of the polymer, the functions of cementation, filling, etc. are played, the average pore diameter of the mortar is reduced, the macropore is reduced to be small pore, the uniformity of pore distribution is reduced, the microporosity is improved, because the process of polymer membrane-forming takes place in the course of cement hydration, the water is used for hydration and is evaporated, the polymer forms a tough and compact network film-like network structure in the whole basal body, the polymer is distributed between cement mortar frameworks to fill gaps, so that a channel with the outside is cut off, the performance of the material is further improved, and most of the polymer can improve the flowing performance of the mortar due to the water building effect of the polymer.
And (4) judging the standard: and (4) proportioning according to specific data, and continuously controlling the average bubble spacing, the water absorption of the aggregate and the particle size of the aggregate, so that the antifreezing value of the grouting material achieves the optimal effect.
The beneficial effects of the invention are: the antifreezing non-shrinkage grouting material and the preparation method thereof are characterized in that the antifreezing effect of the grouting material is improved by adding gel material, aggregate, defoaming agent, fibroin spun fiber, silica fume and air entraining agent, mixing configuration is carried out, the water-gel ratio is controlled to be between 0.4 and 0.55 during proportioning, the air content is controlled, the antifreezing effect of the grouting material is improved by more air content, the antifreezing effect of the grouting material is integrally improved by selecting the variety of the aggregate, controlling the water-gel ratio, absorbing the air content and controlling the air bubble spacing, during preparation, the gel material, the aggregate, the defoaming agent, the fibroin spun fiber, the silica fume and the air entraining agent are crushed and mixed to prepare the grouting material, the aggregate is dried in advance before preparation, the antifreezing effect of the grouting material is improved by controlling the water saturation coefficient and the air bubble spacing coefficient of the aggregate and adding the silica fume and the air entraining agent during stirring, and the average pore diameter of mortar can be reduced by the polymer, macropore becomes the micropore, and the homogeneity of pore distribution has descended, and the microporosity improves, has solved present antifreeze type grout material and can produce to freeze at low temperature the grout material, and mobility greatly reduced fracture, later stage solidification are not closely knit scheduling problem, and traditional grout material can not satisfy the construction side demand on freezing problem for rework and repair become the problem of frequent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The anti-freezing type shrinkage-free grouting material is characterized by comprising the following raw materials in parts by weight: 23% of gel material, 22% of aggregate, 10% of defoaming agent, 8% of fibroin spun fiber, 7% of silica fume, 10% of air entraining agent and 20% of polymer.
2. The antifreeze non-shrinkage grouting material according to claim 1, wherein the aggregate comprises coarse aggregate and fine aggregate, the fine aggregate is natural river sand, the particle size of the fine aggregate is 2.7-3.1mm, and the coarse aggregate is granite and the particle size is not larger than 25 mm.
3. The antifreeze non-shrink grouting material of claim 1, wherein the water-to-glue ratio is between 0.4 and 0.55.
4. The antifreeze non-shrinkage grouting material of claim 1, wherein the gel material is portland cement, and the spacing coefficient of the air bubbles is 500 μm.
5. The preparation method of the anti-freezing type shrinkage-free grouting material is characterized by comprising the following steps of:
1) selecting materials, wherein the variety of the gel material is selected from portland cement, and the larger the water-to-gel ratio is, the more the content of the freezable water in the grouting material is, and the higher the freezing speed of the grouting material is; the worse the bubble structure, the larger the average bubble pitch; the lower the strength of the grouting material is, the poorer the freeze-thaw resistance is, and the frost resistance of the grouting material is improved by controlling the water-gel ratio during proportioning;
2) controlling gas during proportioning, wherein the gas content during proportioning is as follows: in a certain range, the lower the temperature is, the more the air content is, the better the frost resistance of the grouting material is, the air content is in direct proportion to the doping amount of the air entraining agent, when the air content is more than 6%, the air content exceeds a certain range, the frost resistance of the grouting material is poor, and the air content is increased; the forced mixer is easier to bleed than the free-fall mixer, and the big mixer is easier to bleed than the small mixer;
3) during preparation, the cement strength is that when hydrostatic pressure and osmotic pressure exceed the tensile strength of the grouting material, the grouting material generates freeze-thaw damage, so that the strength of the grouting material for representing the capability of resisting the freeze-thaw damage also influences the frost resistance of the grouting material;
4) when the aggregate is proportioned, when the aggregate absorbs water to be saturated, and is frozen, static pressure is generated in the pores of the aggregate and the interface of the aggregate-cement paste, and when the strength of the aggregate or the interface is exceeded, freezing damage is generated;
5) therefore, when stirring and proportioning are carried out, the water absorption rate of the aggregate and the size of the aggregate are controlled, the aggregate is generally produced by a wet method, namely, a large amount of water is adopted to flush the aggregate in the production process of machine-made sand, a method combining mechanical dehydration and natural dehydration is adopted to reduce the water content to be within a specified range and to be stable, the water content of the aggregate is directly related to the weather condition, and the water content of the aggregate can be directly measured by a special instrument by utilizing a microwave humidity measurement technology;
6) average bubble spacing upon stirring: the larger the average bubble spacing is, the larger the hydrostatic pressure and osmotic pressure in capillary pores in the freeze-thawing process are, and the lower the frost resistance of the grouting material is; the high-frost-resistance grouting material can be obtained when the average bubble spacing coefficient is below 500 mu m;
7) during preparation, gel materials, polymers, aggregates, defoaming agents, fibroin spun fibers, silica fume and air entraining agents are crushed and mixed to prepare grouting materials, the aggregates are dried in advance before preparation, the silica fume and the air entraining agents are added during stirring to increase the frost resisting effect of the grouting materials through controlling the water absorption saturation of the aggregates and the coefficient of the air bubble spacing, the air entraining agents can improve the workability, water retention and cohesiveness of concrete mixtures and improve the fluidity of the concrete, a large amount of additives of uniformly distributed, closed and stable micro air bubbles are introduced during the mixing process of the concrete mixtures, so that the frost resisting working performance of the fresh concrete grouting materials is improved, the fibroin spun fiber structures are packaged with air by a plurality of small holes, the air is static, the thermal convection cannot be generated, the heat loss is reduced, and simultaneously due to the particularity of the polymers, it will agglomerate and form membrane at the temperature higher than its lowest membrane-forming temperature, the membrane formed can surround the calcium hydroxide produced by cement hydration, connect into a whole, can reduce the bad influence of calcium hydroxide on the durability of the material effectively, on the other hand, the ettringite in the polymer mortar is shorter and coarser than the ettringite in the ordinary mortar, further observe and find that the addition of polymer has improved the pore structure of the mortar effectively, because of the morphological effect and its own particularity of the polymer, the functions of cementation, filling, etc. are played, the average pore diameter of the mortar is reduced, the macropore is reduced to be small pore, the uniformity of pore distribution is reduced, the microporosity is improved, because the process of polymer membrane-forming takes place in the course of cement hydration, the water is used for hydration and is evaporated, the polymer forms a tough and compact network film-like network structure in the whole basal body, the polymer is distributed among cement mortar frameworks to fill gaps, so that a channel with the outside is cut off, the performance of the material is further improved, and most of the polymer can improve the flowing performance of the mortar due to the water building effect of the polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210767898.XA CN115093180A (en) | 2022-07-01 | 2022-07-01 | Anti-freezing type non-shrinkage grouting material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210767898.XA CN115093180A (en) | 2022-07-01 | 2022-07-01 | Anti-freezing type non-shrinkage grouting material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115093180A true CN115093180A (en) | 2022-09-23 |
Family
ID=83294771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210767898.XA Pending CN115093180A (en) | 2022-07-01 | 2022-07-01 | Anti-freezing type non-shrinkage grouting material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115093180A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833297A (en) * | 2014-01-07 | 2014-06-04 | 清华大学 | High performance cement soil and preparation method thereof |
| CN107365128A (en) * | 2017-07-24 | 2017-11-21 | 浙江大学宁波理工学院 | Useless silk reinforcing fiber cement plate and preparation method thereof |
| CN108164222A (en) * | 2018-02-01 | 2018-06-15 | 天津诚顺达建筑材料检测有限公司 | Cement-based grouting material and grout and mortar |
| CN110526666A (en) * | 2019-09-25 | 2019-12-03 | 湖州乌米科技有限公司 | A kind of high strength sound foam concrete |
| CN111848067A (en) * | 2020-07-30 | 2020-10-30 | 石家庄铁道大学 | Grouting material for large bridge support and preparation method thereof |
| CN114455900A (en) * | 2022-01-05 | 2022-05-10 | 长江生态环保集团有限公司 | Underwater anti-dispersion mortar for large-volume cavity grouting and preparation method thereof |
-
2022
- 2022-07-01 CN CN202210767898.XA patent/CN115093180A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833297A (en) * | 2014-01-07 | 2014-06-04 | 清华大学 | High performance cement soil and preparation method thereof |
| CN107365128A (en) * | 2017-07-24 | 2017-11-21 | 浙江大学宁波理工学院 | Useless silk reinforcing fiber cement plate and preparation method thereof |
| CN108164222A (en) * | 2018-02-01 | 2018-06-15 | 天津诚顺达建筑材料检测有限公司 | Cement-based grouting material and grout and mortar |
| CN110526666A (en) * | 2019-09-25 | 2019-12-03 | 湖州乌米科技有限公司 | A kind of high strength sound foam concrete |
| CN111848067A (en) * | 2020-07-30 | 2020-10-30 | 石家庄铁道大学 | Grouting material for large bridge support and preparation method thereof |
| CN114455900A (en) * | 2022-01-05 | 2022-05-10 | 长江生态环保集团有限公司 | Underwater anti-dispersion mortar for large-volume cavity grouting and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102010166B (en) | Method for preparing micro expanded inorganic heat insulation mortar | |
| CN109456008A (en) | A kind of freeze proof anti-crack concrete and preparation method thereof | |
| CN109354463B (en) | Anti-seepage and anti-freezing C30 concrete and preparation method thereof | |
| CN101928127A (en) | Super-light aggregate concrete for long-distance homogeneous pumping construction and preparation method thereof | |
| CN112679190B (en) | Reinforcing waterproof mortar for filling concrete bottom cavity | |
| CN110467407A (en) | A kind of C70 mass concrete and its preparation process | |
| CN108585927A (en) | A kind of nano-cellulose aerogel thermal insulation board and preparation method thereof | |
| CN107686315A (en) | Freeze proof mass concrete | |
| CN101058494B (en) | CA mortar dry powder for plate-type slag-free orbit | |
| CN109734401A (en) | A kind of air-entrained concrete building block and preparation method thereof prepared using iron tailings as raw material | |
| CN112408880A (en) | Basalt fiber water-permeable concrete and preparation method thereof | |
| CN107512891B (en) | Pavement base material | |
| CN110218030A (en) | A kind of frost-resistant concrete and preparation method thereof | |
| CN113526940A (en) | Anti-freezing inorganic quick-setting grouting material and preparation method thereof | |
| CN114394807A (en) | Porous plant-growing concrete capable of improving plant-growing performance | |
| CN112979241A (en) | Anti-freezing concrete and preparation method thereof | |
| CN115093180A (en) | Anti-freezing type non-shrinkage grouting material and preparation method thereof | |
| CN108623231A (en) | A kind of lightweight aggregate concrete and preparation method thereof | |
| CN109796148B (en) | A kind of anti-crack water-proof agent for concrete and preparation method thereof | |
| CN112456958A (en) | Low-alkalinity high-durability ecological plant-growing concrete material and preparation method thereof | |
| CN111138146A (en) | Preparation method of quick-setting cement-based repair mortar | |
| CN113429176B (en) | Cement-based waterproof material based on osmotic crystallization principle | |
| CN116553886B (en) | Crack-resistant waterproof concrete and preparation method thereof | |
| CN114014583B (en) | Multifunctional concrete waterproofing agent and preparation method thereof | |
| CN117362074B (en) | Permeable concrete for highway construction and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |