CN108793905B - Repair mortar, preparation method thereof and application thereof in precast concrete member repair - Google Patents
Repair mortar, preparation method thereof and application thereof in precast concrete member repair Download PDFInfo
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- CN108793905B CN108793905B CN201810820311.0A CN201810820311A CN108793905B CN 108793905 B CN108793905 B CN 108793905B CN 201810820311 A CN201810820311 A CN 201810820311A CN 108793905 B CN108793905 B CN 108793905B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
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- 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
The invention provides repair mortar which comprises the following components in percentage by mass: 5-15% of Portland cement, 30-50% of sulphoaluminate cement, 10-30% of fast setting cement, 1-2% of redispersible latex powder, 5-10% of expanding agent, 10-30% of quartz sand, 0.1-0.5% of early strength agent, 0.5-1% of rheological agent, 0.2-0.5% of defoaming agent and 15-20% of water. The repair mortar provided by the invention is compounded by using various cements, the proportion of the cements is optimized by reasonably selecting the types of the cements, and proper auxiliary agents such as expansion agents and early strength agents of shrinkage compensation materials are added, so that the finally obtained repair mortar has the advantages of quick setting, high early strength, strong bonding force and no shrinkage. The results of the examples show that the setting time of the repair mortar is about ten minutes, the strength can reach more than 8MPa in half an hour, and the requirements of quick repair and durability of prefabricated parts are met.
Description
Technical Field
The invention relates to the technical field of concrete member repair mortar, in particular to repair mortar, a preparation method thereof and application thereof in precast concrete member repair.
Background
The precast concrete member, also called as a PC member, refers to a concrete product produced by standardized and mechanized processing in a factory, and is widely applied to the fields of construction, traffic, water conservancy and the like.
The appearance defects of the precast concrete member, such as unfilled corners, cracks, cellular pitted surfaces and the like, can inevitably occur in the manufacturing, hoisting, transporting, storing and other processes, the defects not only are the problems in appearance, but also can seriously affect the overall effect of the member, and the appearance quality of the precast concrete member is the visual embodiment of the quality of the precast concrete member, so that the guarantee and improvement of the appearance quality of the precast member have important significance for precast buildings.
At present, the method for solving the problem of appearance quality of concrete members mainly adopts a repairing material for repairing, and the repairing material is required to have the characteristics of quick condensation, high early strength, strong bonding force and the like due to the special property of the repair of prefabricated members. The cement-based repair mortar has high compressive strength (28d strength is about 40 MPa), small shrinkage and long setting time of more than 2 h; the cement plugging agent has short setting time (less than or equal to 10min), but has low strength (28d strength is about 35 MPa), and large shrinkage.
Disclosure of Invention
In view of the above, the present application provides a repair mortar and a preparation method thereof, wherein the repair mortar is applied to repair of precast concrete members, and has the characteristics of rapid setting, no micro-expansion and shrinkage, high bonding strength, no cracking and shedding, good durability, and the like.
The technical scheme is as follows:
the invention provides repair mortar which comprises the following components in percentage by mass: 5-15% of Portland cement, 30-50% of sulphoaluminate cement, 10-30% of fast setting cement, 1-2% of redispersible latex powder, 5-10% of expanding agent, 10-30% of quartz sand, 0.1-0.5% of early strength agent, 0.5-1% of rheological agent, 0.2-0.5% of defoaming agent and 15-20% of water.
The mass content of the portland cement is 5-15%, preferably 8-12%, and more preferably 10%.
The mass content of the sulphoaluminate cement is 30-50%, preferably 35-45%, and more preferably 40%.
The mass content of the quick-setting cement is 10-30%, preferably 15-25%, and more preferably 20%.
Preferably, the redispersible latex powder is an ethylene/vinyl acetate copolymer latex powder.
Preferably, the cement expanding agent is selected from one or more of anhydrite, calcium sulphoaluminate, calcium oxide and hemihydrate gypsum.
Preferably, the cement expansion agent is selected from plastic expansion agents.
Preferably, the particle size of the quartz sand is 50-100 meshes and SiO2The mass content is more than 92 percent; more preferably, the particle size of the quartz sand is 80-100 meshes and SiO2The content is more than 95 percent.
Preferably, the early strength agent is selected from one of lithium carbonate, calcium formate and lithium hydroxide.
Preferably, the rheological agent is an anionic surfactant.
Preferably, the rheological agent is selected from one of naphthalene series rheological agents, sodium lignosulfonate salts, aliphatic rheological agents, amino rheological agents and polycarboxylic acid rheological agents.
The invention also provides a preparation method of the repair mortar in the scheme, which comprises the following steps:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
The invention also provides application of the repair mortar in the scheme or the repair mortar prepared by the preparation method in the scheme in repair of precast concrete members.
Has the advantages that: the invention provides repair mortar which comprises the following components in percentage by mass: 5-15% of Portland cement, 30-50% of sulphoaluminate cement, 10-30% of fast setting cement, 1-2% of redispersible latex powder, 5-10% of expanding agent, 10-30% of quartz sand, 0.1-0.5% of early strength agent, 0.5-1% of rheological agent, 0.2-0.5% of defoaming agent and 15-20% of water. The repair mortar provided by the invention is compounded by using various cements, the proportion of the cements is optimized by reasonably selecting the types of the cements, a proper shrinkage compensation material expanding agent is added, and an early strength agent and other auxiliaries are added, so that the finally obtained repair mortar has the advantages of quick setting, high early strength, strong bonding force and no shrinkage, and is suitable for repairing concrete prefabricated parts. The embodiment result shows that the setting time of the repair mortar provided by the invention is about ten minutes, the strength can reach more than 8MPa in half an hour, the breaking strength and the bonding strength are high, the 28d shrinkage rate is only-0.05, and the requirements of quick repair and durability of a concrete prefabricated part are met.
Detailed Description
The invention provides repair mortar which comprises the following components in percentage by mass: 5-15% of Portland cement, 30-50% of sulphoaluminate cement, 10-30% of fast setting cement, 1-2% of redispersible latex powder, 5-10% of expanding agent, 10-30% of quartz sand, 0.1-0.5% of early strength agent, 0.5-1% of rheological agent, 0.2-0.5% of defoaming agent and 15-20% of water.
The repair mortar comprises three cement components of portland cement, sulphoaluminate cement and double-rapid cement, wherein the three cement components supplement each other in action, and the source of the three cement components is commercially available cement without other special requirements.
The repair mortar provided by the invention comprises 5-15% of Portland cement by mass, preferably 8-12% of Portland cement by mass, and more preferably 10% of Portland cement by mass.
The repair mortar provided by the invention comprises 30-50% of sulphoaluminate cement, preferably 35-45% of sulphoaluminate cement, and more preferably 40% of sulphoaluminate cement based on the mass content of Portland cement.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 10-30% of the double-rapid cement, preferably 15-25%, and more preferably 20%.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 1-2% of redispersible latex powder, and preferably 1.5%; the redispersible latex powder is preferably an ethylene/vinyl acetate copolymer latex powder, more preferably
5010N、
4023N、
FL1210、
One or more of TITAN8100 and AQUAPAS N-2028, most preferably TITAN8100 and AQUAPAS N-2028
5010N; in the invention, the dispersible latex powder can improve the flexibility of the mortar and improve the breaking strength and the construction property of the mortar.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 5-10% of a cement expanding agent, preferably 6-8%, and more preferably 7%; the type of the cement expanding agent is preferably one or more of anhydrous anhydrite, calcium sulphoaluminate, calcium oxide and hemihydrate gypsum, and more preferably the anhydrous anhydrite. In the invention, the cement expanding agent can play a role in compensating cement shrinkage, has low requirement on environment, strong adaptability and stable expansion effect.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 10-30% of quartz sand, preferably 15-25%, and more preferably 20%; in the invention, the particle size of the quartz sand is preferably 50-100 meshes, more preferably 80-100 meshes, and SiO in the quartz sand2Is preferably greater than 92%, more preferably greater than 95%. According to the invention, the quartz sand can enable the repaired prefabricated part to have smooth and fine effects.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 0.1-0.5% of an early strength agent, preferably 0.2-0.4%, and more preferably 0.3%; the type of the early strength agent is preferably one or more of lithium carbonate, calcium formate and lithium hydroxide, and more preferably lithium carbonate. In the invention, the early strength agent can improve the early strength and stability of the repaired prefabricated part.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 0.5-1% of a rheological agent, preferably 0.6-0.8%, and more preferably 0.7%; the rheological agent is preferably an anionic surfactant, the type of the surfactant is preferably one of a naphthalene rheological agent, a sodium lignosulfonate rheological agent, an aliphatic rheological agent, an amino rheological agent and a polycarboxylic acid rheological agent, and the surfactant is more preferably a naphthalene rheological agent.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 0.2-0.5% of defoaming agent, and more preferably 0.3-0.4%; the type of the antifoaming agent is preferably one or more of AGITAN P803, Asia-Himalayan RE2971 and Kainus 50PE, and more preferably AGITAN P803.
The invention has no special requirements on the sources of the redispersible latex powder, the expanding agent, the quartz sand, the early strength agent, the rheological agent and the defoaming agent, and can use the substances sold in the market.
Based on the mass content of the portland cement, the repair mortar provided by the invention comprises 15-20% of water, and preferably 16-18%. The water is not particularly required in the present invention, and mortar water well known to those skilled in the art, such as tap water, may be used.
The invention provides a preparation method of the repair mortar in the scheme, which comprises the following steps:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
The invention mixes the Portland cement, the sulphoaluminate cement and the quick cement to obtain the cement mixture. The invention preferably mixes under the condition of stirring, has no special requirement on the rotating speed of the stirring, and can mix the Portland cement, the sulphoaluminate cement and the quick setting cement uniformly.
After obtaining the cement mixture, the invention preferably mixes the cement mixture with the redispersible latex powder, the expanding agent, the quartz sand, the early strength agent, the rheological agent and the defoaming agent to obtain the cement-auxiliary agent mixture. According to the invention, the redispersible latex powder, the expanding agent, the early strength agent, the rheological agent and the defoaming agent are preferably added into the cement mixture to be stirred and mixed; the invention has no special requirement on the stirring rotating speed, and the materials can be uniformly mixed. According to the invention, the cement is mixed firstly, and then various additives are added into the cement mixture, so that the additives can be uniformly dispersed in the cement mixture.
After the cement-aid mixture is obtained, the cement-aid mixture is mixed with quartz sand to obtain a mixture. According to the invention, quartz sand is preferably added into the cement mixture to be stirred and mixed; the invention has no special requirement on the stirring rotating speed, and the materials can be uniformly mixed.
After the cement-based mortar mixture is obtained, the cement-based mortar mixture is mixed with water to obtain the repair mortar. According to the invention, water is preferably added into the mixture and stirred to obtain a uniform paste, namely the repair mortar of the invention. In a particular embodiment of the invention, the repair mortar is preferably ready to use and ready to use.
In the preparation process of the cement mortar, equipment and parameters are selected by adopting the conventional selection of the application.
The invention provides the application of the repair mortar in the scheme in the repair of the precast concrete member, and the invention has no special requirements on the specific application method and can use the application method of the repair mortar known by the technical personnel in the field.
In order to further illustrate the present invention, the following detailed description of the composite repair mortar provided by the present invention is provided with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The repair mortar provided by the embodiment 1 comprises the following components in percentage by weight:
portland cement 5%, sulphoaluminate cement 50%, fast cement 10%, re-dispersible emulsion powder: (
5010N) 1%, expanding agent (anhydrite) 8%, quartz sand 20%, early strength agent (lithium carbonate) 0.3%, rheological agent (naphthalene series rheological agent) 0.5%, defoaming agent (AGITAN P803) 0.4%, and water 18%.
The preparation process of the repair mortar is as follows:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
Example 2
The repair mortar provided by the embodiment 2 comprises the following components in percentage by weight:
10% of Portland cement, 40% of sulphoaluminate cement, 20% of quick cement and redispersible emulsion powder
5010N) 1%, expanding agent (anhydrite) 8%, quartz sand 20%, early strength agent (lithium carbonate) 0.3%, rheological agent (naphthalene series rheological agent) 0.5%, defoaming agent (AGITAN P803) 0.4%, and water 18%.
The preparation process of the repair mortar is as follows:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
Example 3
The repair mortar provided by the embodiment 3 comprises the following components in percentage by weight:
portland cement 15%, sulphoaluminate cement 30%, fast cement 30%, re-dispersible emulsion powder: (
5010N) 1%, expanding agent (anhydrite) 8%, quartz sand 20%, early strength agent (lithium carbonate) 0.3%, rheological agent (naphthalene series rheological agent) 0.5%, defoaming agent (AGITAN P803) 0.4%, and water 18%.
The preparation process of the repair mortar is as follows:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
Comparative example 1
The repair mortar provided in comparative example 1 comprises the following components in percentage by weight:
35 percent of sulphoaluminate cement, 15 percent of heavy calcium carbonate powder and redispersible emulsion powder (
5010N) 1.5%, expanding agent (anhydrite) 7%, quartz sand 40.5%, early strength agent (carbon)Lithium) 0.2%, retarder (citric acid, tartaric acid) 0.1%, rheological agent (naphthalene series rheological agent) 0.5%, defoaming agent (AGITAN P803) 0.2%, and water 16%.
The preparation process of the repair mortar is as follows:
(1) mixing cement, redispersible latex powder, an expanding agent, an early strength agent, a retarder, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(2) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(3) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
Comparative example 2
The repair mortar provided by the comparative example 2 comprises the following components in percentage by weight:
15% of Portland cement, 35% of sulphoaluminate cement, 15% of heavy calcium carbonate powder, 34.1% of quartz sand, 0.2% of early strength agent (lithium carbonate), 0.5% of rheological agent (naphthalene rheological agent), 0.2% of defoaming agent (AGITAN P803) and 18% of water.
The preparation process of the repair mortar is as follows:
(1) mixing portland cement and sulphoaluminate cement to obtain a cement mixture;
(2) mixing the cement mixture with an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
The performance of the repair mortars obtained in examples 1 to 3 and comparative examples 1 to 2 was measured, and the results are shown in table 1.
TABLE 1 comparison of the technical parameters of the mortars in the examples
As can be seen from comparison between 3 groups of examples and comparative examples in the table 1, compared with mortar with a single cement component, the repair mortar provided by the application has the advantages that the technical indexes such as setting time, strength and shrinkage rate are remarkably improved, the setting time is less than ten minutes, the compressive strength can reach more than 8MPa in half an hour, the flexural strength and the bonding strength are high, the 28d shrinkage rate is only-0.05, and the requirements of quick repair and durability of a concrete prefabricated part are met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The repair mortar is characterized by comprising the following components in percentage by mass: 5-15% of Portland cement, 30-50% of sulphoaluminate cement, 10-30% of quick cement, 1-2% of redispersible latex powder, 5-10% of expanding agent, 10-30% of quartz sand, 0.1-0.5% of early strength agent, 0.5-1% of rheological agent, 0.2-0.5% of defoaming agent and 15-20% of water;
the expanding agent comprises one or more of anhydrous anhydrite, calcium sulphoaluminate, calcium oxide and semi-hydrated gypsum.
2. The repair mortar of claim 1, wherein the redispersible latex powder is an ethylene/vinyl acetate copolymer latex powder.
3. The repair mortar of claim 1, wherein the expanding agent comprises a plastic expanding agent.
4. The repair mortar of claim 1, wherein the silica sand has a particle size of 50 to 100 mesh and SiO2The mass content is more than 92 percent.
5. The repair mortar of claim 1, wherein the early strength agent comprises one or more of lithium carbonate, calcium formate, and lithium hydroxide.
6. The repair mortar of claim 1, wherein the rheological agent is an anionic surfactant.
7. The repair mortar of claim 1 or 6, wherein the rheological agent comprises one or more of a naphthalene-based rheological agent, a sodium lignosulfonate-based rheological agent, an aliphatic rheological agent, an amino rheological agent and a polycarboxylic acid rheological agent.
8. The preparation method of the repair mortar according to any one of claims 1 to 7, comprising the steps of:
(1) mixing portland cement, sulphoaluminate cement and fast cement to obtain a cement mixture;
(2) mixing the cement mixture with redispersible latex powder, an expanding agent, an early strength agent, a rheological agent and a defoaming agent to obtain a cement-auxiliary agent mixture;
(3) mixing the cement-additive mixture with quartz sand to obtain a cement-based mortar mixture;
(4) and mixing the cement-based mortar mixture with water to obtain the repair mortar.
9. Use of the repair mortar according to any one of claims 1 to 7 or the repair mortar prepared by the preparation method according to claim 8 in repairing precast concrete members.
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| CN111875322A (en) * | 2020-08-07 | 2020-11-03 | 江苏智信达建筑科技有限公司 | Multi-component concrete composite repair mortar |
| CN112341133A (en) * | 2020-11-09 | 2021-02-09 | 苏州佳固士新材料科技有限公司 | Novel inorganic waterproof plugging material and application thereof |
| CN112479669A (en) * | 2020-12-22 | 2021-03-12 | 汝州市东江建筑工业科技有限公司 | Concrete damage repairing cement-based material for prefabricated part and application thereof |
| CN112851219A (en) * | 2021-02-05 | 2021-05-28 | 成都建工赛利混凝土有限公司 | Repair mortar for concrete member and preparation method thereof |
| CN112939542B (en) * | 2021-03-29 | 2022-07-26 | 贵州盘江煤电集团技术研究院有限公司 | High-strength, quick-setting and expansion type multipurpose grouting material and preparation and application methods thereof |
| CN117602911B (en) * | 2024-01-22 | 2024-05-17 | 江苏欧西建材科技发展有限公司 | Saline-alkali-resistant rapid repair mortar and preparation method thereof |
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| "硅酸盐-硫铝酸盐水泥复合水泥水化协同效应研究";万宇豪等;《科学技术与工程》;20170518;第17卷(第14期);第291页左栏第2-8行和右栏倒数2行、第294页"结论（1）" * |
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| CN108793905A (en) | 2018-11-13 |
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