CN110563432A - Grouting material based on magnesium phosphate cement - Google Patents
Grouting material based on magnesium phosphate cement Download PDFInfo
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- CN110563432A CN110563432A CN201910999003.3A CN201910999003A CN110563432A CN 110563432 A CN110563432 A CN 110563432A CN 201910999003 A CN201910999003 A CN 201910999003A CN 110563432 A CN110563432 A CN 110563432A
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- magnesium phosphate
- phosphate cement
- grouting material
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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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a grouting material based on magnesium phosphate cement, which comprises the following components in parts by weight: 100-200 parts of magnesium phosphate cement, 8-20 parts of an additive, 10-40 parts of an admixture, 0-200 parts of sandstone, 0-3 parts of an interface tackifier, 0-15 parts of an anti-freezing material and 20-40 parts of water. The grouting material has the advantages of high early strength, proper setting time, good water resistance and volume stability, small thermal expansion coefficient and the like, can be put into use in the same day of construction, can be constructed at negative temperature, and has good flowing property, high compactness and no cracking.
Description
Technical Field
The invention belongs to the technical field of building material engineering, and particularly relates to a grouting material based on a magnesium phosphate material.
Background
At present, the method aims to realize the modernization of the building industry, carry out the green development concept and improve the quality of the building engineering. The assembly type building has the advantages of being capable of being produced in batches, high in building speed, simple and easy to construct, capable of reducing labor force, small in environmental pollution and the like, and is becoming popular. The fabricated building refers to a building constructed by connecting various prefabricated elements through various reliable connection methods. At present, the connection between prefabricated parts mainly refers to joint connection, and one important connection mode in the joint connection is wet connection, which is usually made of grouting materials. Furthermore, grouting is also required for prestressed member anchoring in prestressed post-tensioned members.
At present, the grouting material used for the assembly type building grouting connection or the grouting material used for the prestressed anchorage in the market is generally cement-based grouting material, and has the defects of large volume shrinkage, easy generation of microcracks, untight connection between members, slow strength development, poor durability and low chemical and physical erosion resistance. In addition, the common cement-based grouting material made of common Portland cement has the phenomena of low strength, serious bleeding and the like due to large water-cement ratio, and even residual cracks are formed after grouting to form a leakage channel, so that the actual requirements of engineering cannot be met. Therefore, how to improve the performance of grouting materials in buildings to achieve better effects in terms of strength, grouting ability and durability has been an important subject of modern grouting material research.
The magnesium phosphate cement is a novel early-strength rapid-hardening inorganic cementing material, has the advantages of high early strength, short setting time, good volume stability and the like, and is a green environment-friendly material with a great research prospect. However, the existing magnesium phosphate cement has the defects of inconvenient construction, poor fluidity, insufficient water resistance and the like caused by over short setting time.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide the grouting material based on the magnesium phosphate cement, which has proper setting time, good fluidity and good water resistance.
The technical scheme is as follows: the grouting material based on the magnesium phosphate cement comprises the following components in parts by weight: 100-200 parts of magnesium phosphate cement, 8-20 parts of an additive, 10-40 parts of an admixture, 0-200 parts of sandstone, 0-3 parts of an interface tackifier, 0-15 parts of an anti-freezing material and 20-40 parts of water.
Further, the additive comprises the following components in parts by weight: 5-8 parts of retarder, 1-4 parts of water reducing agent, 1-4 parts of water-retaining agent, 0-2 parts of antifreezing agent and 1-2 parts of defoaming agent.
Further, the retarder is industrial grade borax or boric acid.
Further, the water reducing agent is a lignin water reducing agent or a polycarboxylic acid water reducing agent.
Furthermore, the water-retaining agent is hydroxypropyl methyl cellulose ether, so that the viscosity of liquid in a system can be increased, the moving speed of internal ions can be reduced, and the reaction rate can be reduced.
Further, the antifreezing agent is a mixed solution of calcium chloride and sodium chloride.
Furthermore, the defoaming agent is an organic silicon powder defoaming agent, is low in dosage and cost, is immiscible with water and most organic matters, and can defoam most of bubble media.
Further, the admixture is prepared from fly ash and metakaolin according to a weight ratio of 2-4: 1, in a mixture of the components.
Further, the interface tackifier is redispersible latex powder.
Further, the anti-freezing material is a mixture of silica fume and limestone powder in a weight ratio of 1-1.2: 1.
Preferably, the grade of the fly ash is not lower than two grades, the fineness is 200-1600 meshes, and the fineness of the metakaolin is 800-1400 meshes.
Preferably, the specific surface area of the silica fume is 15000-16000m2And Kg, the fineness of the limestone powder is 200-400 meshes, and the maximum particle size is less than 25 mu m.
Preferably, the sandstone is subjected to the procedures of screening, shaping, dust removal and the like in the processing process, so that the gradation of the sandstone meets the quality standard, the particle size is less than 2.36mm, the doping amount of sand accounts for 3 percent of the total mass, and the fineness modulus is less than 2.0.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: firstly, the grouting material prepared by selecting specific components and specific proportions ensures that the construction time is reduced, and meanwhile, the setting time of the grouting material is not too short to cause construction inconvenience; the early strength is developed quickly and has high strength, the self-compaction is good, and the construction requirement can be met without strong vibration; secondly, the grouting material has good volume stability, small shrinkage, low thermal expansion coefficient and strong environmental adaptability, and can continue to hydrate at negative temperature; meanwhile, a layer of oxide film is formed on the surface of the grouting material, and the oxide film is firmly bonded with the reinforcing steel bars and the prestressed tendons, so that the magnesium phosphate cement is normally hardened at the negative temperature; in addition, the additive can improve the water resistance of the magnesium phosphate cement, can be constructed on wet roads and in adverse weather such as rainy days, obviously improves the fluidity of the product under the condition of not obviously increasing the water consumption, improves the compactness of the product, and reduces the loss of water in the magnesium phosphate cement in the reaction process.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 8 parts of an additive, 15 parts of an admixture, 1 part of redispersible latex powder, 10 parts of an anti-freezing material and 20 parts of water.
The additive comprises the following components in parts by weight: 5 parts of borax, 1 part of a lignin water reducing agent, 1 part of hydroxypropyl methyl cellulose ether and 1 part of an organic silicon powder defoaming agent.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the selected anti-freezing material is silica fume and limestone with the weight ratio of 1: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Example 2
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 13.5 parts of an additive, 10 parts of an admixture, 150 parts of sandstone, 3 parts of redispersible latex powder and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of boric acid, 2 parts of a polycarboxylic water reducer, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of a mixed solution of calcium chloride and sodium chloride and 1.5 parts of an organic silicon powder defoaming agent, and the materials are added into a stirrer according to the proportion and mixed with water to obtain the phosphate material grouting material.
The selected admixture is fly ash and metakaolin according to the weight ratio of 3: 1, in a mixture of the components.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Example 3
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 180 parts of magnesium phosphate cement, 16.5 parts of an additive, 25 parts of an admixture, 1.3 parts of redispersible latex powder and 36 parts of water.
The additive comprises the following components in parts by weight: 8 parts of borax, 2.5 parts of a lignin water reducing agent, 2.5 parts of hydroxypropyl methyl cellulose ether, 2 parts of a mixed solution of calcium chloride and sodium chloride and 1.5 parts of an organic silicon powder defoaming agent.
The selected admixture is fly ash and metakaolin according to the weight ratio of 4: 1, in a mixture of the components.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Example 4
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 200 parts of magnesium phosphate cement, 20 parts of an additive, 40 parts of an admixture, 200 parts of sand, 15 parts of an anti-freezing material and 40 parts of water.
The additive comprises the following components in parts by weight: 8 parts of boric acid, 4 parts of a polycarboxylic acid water reducing agent, 4 parts of hydroxypropyl methyl cellulose ether, 2 parts of a mixed solution of calcium chloride and sodium chloride and 2 parts of an organic silicon powder defoaming agent.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material silicon ash to the limestone is 1.1: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Example 5
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sand and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of a lignin water reducing agent, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of an organic silicon powder defoaming agent and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 4: 1, in a mixture of the components.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Example 6
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of a lignin water reducing agent, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of an organic silicon powder defoaming agent and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Comparative example 1
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 2 parts of a lignin water reducing agent, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of a silicone powder defoaming agent and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Comparative example 2
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of silicone powder defoaming agent and 2 parts of mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Comparative example 3
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of a lignin water reducing agent, 1 part of an organic silicon powder defoaming agent and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Comparative example 4
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 30 parts of an admixture, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of a lignin water reducing agent, 2 parts of hydroxypropyl methyl cellulose ether and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
Comparative example 5
A grouting material based on magnesium phosphate cement comprises the following components in parts by weight: 150 parts of magnesium phosphate cement, 14 parts of an additive, 100 parts of sandstone, 1.3 parts of redispersible latex powder, 15 parts of an anti-freezing material and 30 parts of water.
The additive comprises the following components in parts by weight: 7 parts of borax, 2 parts of a lignin water reducing agent, 2 parts of hydroxypropyl methyl cellulose ether, 1 part of an organic silicon powder defoaming agent and 2 parts of a mixed solution of calcium chloride and sodium chloride.
The selected admixture is fly ash and metakaolin according to the weight ratio of 2:1, the weight ratio of the selected antifreeze material, namely the silica fume and the limestone, is 1.2: 1.
Adding the materials into a stirrer, adding water and stirring to obtain the grouting material.
The magnesium phosphate cement grouting materials prepared in the examples 1 to 6 and the comparative examples 1 to 5 were tested for properties such as setting time, fluidity, compressive strength, flexural strength, etc., and the results are detailed in the following table 1.
TABLE 1 basic Properties of magnesium phosphate Cement grouting materials
As can be seen from examples 1-6, the grouting material of the present invention has a high fluidity, which makes it easy to fill the grouting space with the grouting slurry, even when the grouting hole is narrow and bent, such as some post-tensioned tendon hole sealing anchors, the grouting hole can be easily filled with the grouting slurry at this fluidity, and the shrinkage is minimal, so that the grouting slurry can well fill the whole grouting space after setting and hardening. Three hours after pouring, no matter resistance to compression or bending, its intensity all has higher value, can accomplish like this basically, can just come into use within a few hours after the construction, and this is crucial to improving fabricated building construction speed. Secondly, the grouting material ensures that the construction time is reduced, and the construction inconvenience caused by too short condensation time is avoided. In addition, the grouting material has good bonding performance with the reinforcing steel bars. Meanwhile, the grouting material has good durability, so that the subsequent use and maintenance cost is greatly reduced.
Comparing comparative examples 1 and 3 with examples 1 to 6, it can be seen that compared with grouting materials not doped with retarder and water-retaining agent, the retarder and water-retaining agent of the present invention properly prolong the setting time of magnesium phosphate cement, facilitating grouting construction of the slurry, and simultaneously, as the hydration reaction is slowed down, the hydration heat release becomes more uniform, the temperature rise is not too fast, and the excessive expansion, strength decrease and durability decrease of the slurry are avoided.
Comparing the comparative example 2 with the examples 1-6, it can be seen that the addition of the water reducing agent greatly improves the fluidity of the grouting material, improves the application range of grouting material, especially can adapt to some long and narrow holes which are difficult to be grouted, and simultaneously improves the fluidity, so that the grouting material can be more easily grouted, and the grouting speed of the grouting material is improved.
Comparing comparative example 4 with examples 1-6, it can be seen that the addition of the defoaming agent greatly improves the compactness of the slurry, which can be reflected by the good compression strength and breaking strength.
Comparing comparative example 5 with examples 1-6, it can be seen that the addition of the admixture greatly improves the water resistance and strength of the grouting slurry of the present invention, so that the service life of the building is ensured, and the maintenance cost is reduced.
Claims (10)
1. The grouting material based on the magnesium phosphate cement is characterized by comprising the following components in parts by weight: 100-200 parts of magnesium phosphate cement, 8-20 parts of an additive, 10-40 parts of an admixture, 0-200 parts of sandstone, 0-3 parts of an interface tackifier, 0-15 parts of an anti-freezing material and 20-40 parts of water.
2. The magnesium phosphate cement-based grouting material of claim 1, wherein the additive comprises the following components in parts by weight: 5-8 parts of retarder, 1-4 parts of water reducing agent, 1-4 parts of water-retaining agent, 0-2 parts of antifreezing agent and 1-2 parts of defoaming agent.
3. The magnesium phosphate cement-based grouting material of claim 2, characterized in that: the retarder is industrial grade borax or boric acid.
4. The magnesium phosphate cement-based grouting material of claim 2, characterized in that: the water reducing agent is a lignin water reducing agent or a polycarboxylic acid water reducing agent.
5. The magnesium phosphate cement-based grouting material of claim 2, characterized in that: the water-retaining agent is hydroxypropyl methyl cellulose ether.
6. The magnesium phosphate cement-based grouting material of claim 2, characterized in that: the antifreezing agent is a mixed solution of calcium chloride and sodium chloride.
7. The magnesium phosphate cement-based grouting material of claim 2, characterized in that: the defoaming agent is an organic silicon powder defoaming agent.
8. The magnesium phosphate cement-based grouting material of claim 1, characterized in that: the admixture is prepared from fly ash and metakaolin according to the weight ratio of 2-4: 1, in a mixture of the components.
9. The magnesium phosphate cement-based grouting material of claim 1, characterized in that: the interface tackifier is redispersible latex powder.
10. The magnesium phosphate cement-based grouting material of claim 1, characterized in that: the anti-freezing material is a mixture of silica fume and limestone powder in a weight ratio of 1-1.2: 1.
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| CN201910999003.3A CN110563432A (en) | 2019-10-21 | 2019-10-21 | Grouting material based on magnesium phosphate cement |
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| CN201910999003.3A CN110563432A (en) | 2019-10-21 | 2019-10-21 | Grouting material based on magnesium phosphate cement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521125A (en) * | 2020-12-16 | 2021-03-19 | 江苏诺邦建材有限公司 | Rapid hardening grouting material for repairing deep cracks in low negative temperature environment |
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2019
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Application publication date: 20191213 |