CN113816688B - Anchor sealing mortar and preparation method thereof - Google Patents
Anchor sealing mortar and preparation method thereof Download PDFInfo
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- CN113816688B CN113816688B CN202111209591.XA CN202111209591A CN113816688B CN 113816688 B CN113816688 B CN 113816688B CN 202111209591 A CN202111209591 A CN 202111209591A CN 113816688 B CN113816688 B CN 113816688B
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Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- 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
Abstract
The invention discloses an anchor sealing mortar and a preparation method thereof, wherein the anchor sealing mortar comprises the following raw materials in parts by weight: 40.0-50.0 parts of cement, 30.0-40.0 parts of fine aggregate, 4.0-10.0 parts of carbon nano tube modified mineral admixture, 1.0-3.0 parts of water reducing agent, 0.5-1.0 part of viscosity modifier, 0-1.5 parts of retarder, 0-1.0 part of early strength coagulant, 1.0-2.0 parts of shrinkage reducing agent, 8.0-11.0 parts of single-component water-cured polyurethane waterproof coating and 5.0-12.0 parts of water; the sealing anchor mortar provided by the invention has good workability, high strength, good compactness, excellent waterproof and anti-permeability performance, good cohesiveness with anchor holes and proper toughness, can be tightly bonded when the anchor recess of the track plate is chemically deformed, can play a role in cathodic protection on reinforcing steel bars in the anchor recess by adding the carbon nano tube modified admixture, has more excellent corrosion resistance, and simultaneously has good extrudability and easy construction and face recovery.
Description
Technical Field
The invention belongs to the technical field of building engineering, relates to anchor sealing mortar and a preparation method thereof, and particularly relates to anchor sealing mortar for sealing prestressed reinforcement anchor caves in the manufacturing process of prestressed track slabs and prestressed sleepers and a preparation method thereof.
Background
In recent years, a novel ballastless track using concrete or asphalt mixed materials as main materials is vigorously developed for a high-speed railway to replace a traditional ballast track bed. The ballastless track slowly replaces a ballast track bed due to the advantages of strong integrity, good stability, long service life, low noise, small dust, environment beautification, good maintenance and the like, and is widely applied to high-speed railways.
In the construction process of a ballastless prestressed track or a prestressed sleeper, anchor sealing mortar is needed to seal the prestressed reinforcement anchor hole, the quality of the anchor sealing mortar directly influences the durability of the track plate and the sleeper, and if the anchor sealing mortar is cracked or falls off and is broken due to the fact that the anchor sealing mortar is not firmly combined with concrete around the anchor hole, prestressed reinforcements of the track plate are corroded, and the durability of the prestressed reinforcements is seriously influenced.
In the prior art, the mortar is prepared by adding or not adding mineral admixtures, and the mortar is prepared by adding conventional mineral admixtures such as fly ash and mineral powder, but the comprehensive performance of the prepared mortar is not ideal.
Disclosure of Invention
In order to solve the technical problems, the invention provides the anchor sealing mortar and the preparation method thereof, and the anchor sealing mortar has the advantages of good workability, high strength, good compactness, excellent impermeability, good cohesiveness with anchor holes, good extrudability and easiness in construction and surfacing.
The technical scheme adopted by the invention is as follows:
the anchor sealing mortar comprises the following raw materials in parts by weight: 40.0-50.0 parts of cement, 30.0-40.0 parts of fine aggregate, 4.0-10.0 parts of carbon nano tube modified mineral admixture, 1.0-3.0 parts of water reducing agent, 0.5-1.0 part of viscosity modifier, 0-1.5 parts of retarder, 0-1.0 part of early strength coagulant, 1.0-2.0 parts of shrinkage reducing agent, 8.0-11.0 parts of single-component water-cured polyurethane waterproof coating and 5.0-12.0 parts of water.
The preparation method of the carbon nano tube modified mineral admixture comprises the following steps:
(1) adding the carbon nano tube into a polyvinyl alcohol aqueous solution, and carrying out ultrasonic treatment for 2.0-2.5 h;
(2) adding the fly ash, the superfine mineral powder, the silica fume, the anhydrous sodium sulphate and the calcium acetate into the step (1), and continuing to perform ultrasonic treatment for 1.0 to 1.5 hours;
(3) and (3) spray drying the solution obtained in the step (2) to prepare powder.
The carbon nano tube modified mineral admixture is prepared from the following raw materials in parts by weight: 25-40 parts of fly ash, 3-5 parts of carbon nano tubes, 45-60 parts of superfine mineral powder, 5-10 parts of silica fume, 3-5 parts of anhydrous sodium sulphate, 3-5 parts of calcium acetate and 100 parts of polyvinyl alcohol aqueous solution; the solid content of the polyvinyl alcohol aqueous solution is 3-8%.
The grain diameters of the fly ash, the carbon nano tube, the superfine mineral powder, the silica fume and the anhydrous sodium sulphate are respectively 20-30 μm, 2-20nm, 5-10 μm, 0.1-0.3 μm and 50-100 μm.
The cement is any one or more of ordinary portland cement, sulphoaluminate cement and rapid hardening portland cement.
The fine aggregate is any one or more of river sand, machine-made sand and quartz sand.
The water reducing agent is any one or more of a naphthalene water reducing agent, a melamine water reducing agent, a sulfamate water reducing agent and a polycarboxylic acid water reducing agent.
The viscosity modifier is any one or more of cellulose ether, polyacrylamide and wood fiber.
The retarder is any one or more of sodium citrate, sodium tartrate and borax.
The early strength coagulant is any one or more of lithium sulfate and lithium carbonate.
The shrinkage reducing agent is any one or more of polyether series shrinkage reducing agent and polyester series shrinkage reducing agent.
The preparation method of the anchor sealing mortar comprises the following steps: the cement, the fine aggregate, the carbon nano tube modified mineral admixture, the water reducing agent, the viscosity modifier, the retarder, the early strength coagulant and the shrinkage reducing agent are mixed and stirred uniformly, and then the single-component water-cured polyurethane and the water are added and stirred and mixed uniformly, so that the anchor sealing construction can be carried out.
The anchor sealing mortar provided by the invention uses the carbon nano tube modified mineral admixture as a raw material, wherein the raw material of the modified mineral admixture comprises fly ash, carbon nano tubes, superfine mineral powder, silica fume, anhydrous sodium sulphate and calcium acetate, and the aim of making up for deficiencies by utilizing the physical effect of mutually and tightly filling various admixtures with different particle diameters is achieved, so that the super-overlapping effect with the activity obviously higher than that of each single admixture is generated; after the raw materials are modified by the carbon nano tubes, the performance of the mineral admixture is further improved based on the good mechanical property and chemical stability of the carbon nano tubes, and the carbon nano tubes can form a micro capacitor in concrete, capture moving charges, reduce the conductivity of the anchoring mortar, further protect reinforcing steel bars from corrosion, and play roles in toughening and reinforcing the carbon nano tubes and protecting reinforcing steel bars cathodes.
The comprehensive performance of the anchoring mortar is more excellent under the coordination of the carbon nano tube modified mineral admixture and various functional additives in the formula. The functional additive is added to perfectly combine the workability, the early and later strength, the impermeability, the durability and the cohesiveness of the mortar, for example: the addition of the water reducing agent can ensure that the anchor sealing mortar has excellent extrudability under the condition of low water-material ratio, and simultaneously, the strength performance of the mortar is improved; the viscosity modifier can make the mortar have a viscosity suitable for processing, and the retarder and the early strength coagulant can make the anchor sealing mortar have a suitable construction time, and the anchor sealing mortar cannot be prematurely set, hardened and lose fluidity or be too slow to have early strength lower than a required value due to too slow setting.
The single-component water-cured polyurethane waterproof coating is used in the raw materials of the anchor sealing mortar provided by the invention, the polyurethane material has excellent wear resistance, waterproofness, corrosion resistance and good toughness and adhesion, the single-component water-cured polyurethane waterproof coating can form a whole with cement mortar while undergoing a cross-linking curing reaction with water, and the mortar is tightly bonded with the base surface of an anchor hole and is not easy to fall off due to the excellent adhesion; compared with the anchor sealing mortar taking the dispersible polymer emulsion as the raw material, the bonding tightness of the mortar and the anchor cavity base surface is greatly improved, and the dispersible polymer emulsion only can exert the physical bonding property in a formula system, so the bonding property is relatively poor.
Through the synergistic effect of all materials in the formula of the anchor sealing mortar, the water reducing agent can improve the fluidity of the mortar, but the viscosity is easily too low, so that the phenomenon of sagging occurs after the anchor sealing mortar is sealed, the viscosity of the mortar can be increased while the fluidity is reduced as little as possible by the viscosity modifier, the sagging is avoided, the setting time of the mortar can be reduced by the retarder, the early strength is easily influenced, and therefore the early strength is improved while the construction time of the mortar is ensured. The anchoring mortar provided by the invention has good workability, high strength, good compactness, excellent waterproof and anti-permeability performance, good cohesiveness with an anchor hole and proper toughness, can be tightly bonded when an anchor recess of a track plate is chemically deformed, can play a role in cathodic protection on a steel bar in the anchor recess while improving the mechanical property of the mortar by adding the carbon nano tube modified admixture, has more excellent corrosion resistance, and is good in extrudability and easy to construct and take up faces.
Detailed Description
The present invention will be described in detail with reference to examples.
The one-component water-curable polyurethane waterproof coating used in each of the examples and comparative examples of the present invention was HC-21, manufactured by Guangdong Edison New Material science, Inc
The sealing mortar in each of the examples and comparative examples comprises the raw materials in parts by weight shown in table 1, and the raw materials and weight percentages of the carbon nanotube-modified mineral admixture in the raw materials are shown in table 2.
Table 1 raw materials and parts by weight of anchor sealing mortar in each of examples and comparative examples
In the table: the mineral admixture is composed of the following raw materials in parts by weight: 28 parts of fly ash, 4 parts of carbon nano tube, 55 parts of superfine mineral powder, 8 parts of silica fume, 5 parts of anhydrous sodium sulphate, 4 parts of calcium acetate and 100 parts of polyvinyl alcohol aqueous solution with solid content of 5%; the acrylic emulsion had a solids content of 60%.
Table 2 raw materials and their parts by weight of carbon nanotube modified mineral admixtures
| Example 1 | Example 2 | Example 3 | |
| Fly ash | 28 | 38 | 40 |
| Carbon nanotube | 4 | 5 | 5 |
| Superfine mineral powder | 55 | 42 | 58 |
| Silica fume | 8 | 6 | 5 |
| Anhydrous sodium sulphate | 5 | 4 | 3 |
| Acetic acid calcium salt | 4 | 3 | 5 |
| Polyvinyl alcohol aqueous solution with solid content of 5% | 100 | 100 | 100 |
The preparation method of the carbon nano tube modified mineral admixture in each embodiment comprises the following steps:
(1) adding the carbon nano tube with the formula amount into the polyvinyl alcohol aqueous solution with the formula amount, and carrying out ultrasonic treatment for 2.0 h;
(2) adding the fly ash, the superfine mineral powder, the silica fume, the anhydrous sodium sulphate and the calcium acetate with the formula ratio into the step (1), and continuing to perform ultrasonic treatment for 1.0 h;
(3) and (3) spray drying the solution obtained in the step (2) to prepare powder.
The preparation method of the anchor sealing mortar in each embodiment and each comparative example comprises the following steps: all the raw materials except the single-component water-cured polyurethane waterproof coating or the acrylic emulsion and the water in the formula amount are placed in a stirrer for stirring for 60s at 180r/min, the single-component water-cured polyurethane waterproof coating or the acrylic emulsion and the water in the formula amount are stirred uniformly, then the mixture is slowly added into the stirrer, and the stirring is carried out at 180r/min for 3-4min until the mixture is stirred uniformly.
The performances of the anchor sealing mortar prepared in each example and each comparative example are detected according to a detection method specified in Q/CR567-2017 CRTS type slab ballastless track pretensioned concrete track slab, the corrosion resistance of the anchor sealing mortar is determined by adopting an accelerated corrosion test (GM9540P), and the detection results are shown in Table 3:
TABLE 3 Properties of sealing mortar prepared in each example and comparative example
From the above data it can be seen that: examples 1-3 have better workability, compressive strength, cohesive strength and corrosion resistance than comparative examples 1-4. The components in the anchor sealing mortar provided by the invention have good construction performance and excellent mechanical property through synergistic effect, the anchor sealing mortar has good workability, high strength, good compactness, excellent water resistance and impermeability, good adhesion with an anchor hole and proper toughness, can be tightly adhered when an anchor recess of a track plate is chemically deformed, and can play a role in cathodic protection on reinforcing steel bars in the anchor recess by adding the carbon nano tube modified admixture, so that the corrosion resistance is more excellent, and meanwhile, the extrusion performance is good, and the construction and the surface folding are easy.
The above detailed description of an anchor sealing mortar and a method for preparing the same with reference to the embodiments is illustrative and not restrictive, and several embodiments can be enumerated within the scope of the limitations, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. The anchor sealing mortar is characterized by comprising the following raw materials in parts by weight: 40.0-50.0 parts of cement, 30.0-40.0 parts of fine aggregate, 4.0-10.0 parts of carbon nano tube modified mineral admixture, 1.0-3.0 parts of water reducing agent, 0.5-1.0 part of viscosity modifier, 0-1.5 parts of retarder, 0-1.0 part of early strength coagulant, 1.0-2.0 parts of shrinkage reducing agent, 8.0-11.0 parts of single-component water-cured polyurethane waterproof coating and 5.0-12.0 parts of water;
the preparation method of the carbon nano tube modified mineral admixture comprises the following steps:
(1) adding the carbon nano tube into a polyvinyl alcohol aqueous solution, and carrying out ultrasonic treatment for 2.0-2.5 h;
(2) adding the fly ash, the superfine mineral powder, the silica fume, the anhydrous sodium sulphate and the calcium acetate into the step (1), and continuing to perform ultrasonic treatment for 1.0 to 1.5 hours;
(3) and (3) spray-drying the solution obtained in the step (2) to prepare powder.
2. The anchor sealing mortar of claim 1, wherein the weight ratio of the raw materials in the preparation process of the carbon nanotube modified mineral admixture is as follows: 25-40 parts of fly ash, 3-5 parts of carbon nano tubes, 45-60 parts of superfine mineral powder, 5-10 parts of silica fume, 3-5 parts of anhydrous sodium sulphate, 3-5 parts of calcium acetate and 100 parts of polyvinyl alcohol aqueous solution; the solid content of the polyvinyl alcohol aqueous solution is 3-8%.
3. The sealing mortar of claim 1, wherein the cement is any one or more of ordinary portland cement, sulphoaluminate cement, and rapid hardening portland cement.
4. The anchor sealing mortar of claim 1, wherein the fine aggregate is any one or more of river sand, machine-made sand and quartz sand.
5. The anchor sealing mortar of claim 1, wherein the water reducing agent is any one or more of a naphthalene-based water reducing agent, a melamine-based water reducing agent, an aminosulfonate-based water reducing agent, and a polycarboxylic acid-based water reducing agent.
6. The sealing mortar of claim 1, wherein the viscosity modifier is any one or more of cellulose ether, polyacrylamide, and wood fiber.
7. The anchor sealing mortar of claim 1, wherein the retarder is any one or more of sodium citrate, sodium tartrate and borax.
8. The sealing anchor mortar of claim 1, wherein the early strength coagulant is any one or more of lithium sulfate and lithium carbonate; the shrinkage reducing agent is any one or more of polyether series shrinkage reducing agent and polyester series shrinkage reducing agent.
9. The method for preparing the anchoring mortar of any one of claims 1 to 8, wherein the cement, the fine aggregate, the carbon nanotube modified mineral admixture, the water reducing agent, the viscosity modifier, the retarder, the early strength coagulant and the shrinkage reducing agent are mixed and stirred uniformly, and then the one-component water-curable polyurethane waterproof coating is added, and water is stirred and mixed uniformly.
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