CN115057678A - Ordinary cement-based grouting material for stabilizing bottom plate of bridge support - Google Patents
Ordinary cement-based grouting material for stabilizing bottom plate of bridge support Download PDFInfo
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- CN115057678A CN115057678A CN202210695113.2A CN202210695113A CN115057678A CN 115057678 A CN115057678 A CN 115057678A CN 202210695113 A CN202210695113 A CN 202210695113A CN 115057678 A CN115057678 A CN 115057678A
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- parts
- grouting material
- agent
- based grouting
- bottom plate
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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
- 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
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a common cement-based grouting material for stabilizing a bridge support base plate, which comprises the following components in parts by weight: 55-70 parts of ordinary portland cement, 50-100 parts of machine-made sand, 35-55 parts of a composite mineral admixture, 3-6 parts of basalt fiber, 1-3 parts of a polycarboxylic acid high-efficiency water reducing agent, 3-5 parts of a water-retaining agent, 6-10 parts of a modified expanding agent, 1-2 parts of a retarder and 2-3 parts of a defoaming agent; the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is (5-7): 1; the modified expanding agent is a polyethylene glycol coated modified calcium oxide expanding agent. The grouting material prepared by the invention has the advantages of good stability, excellent fluidity and good mechanical property.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a common cement-based grouting material for stabilizing a bridge support base plate.
Background
The bridge support is an important structure for connecting the upper part and the lower part of a bridge, and the flatness and strength after the support is installed and anchored directly influence the service performance of the support, so that the driving safety and the comfort of the bridge are influenced. In the support anchoring construction, an anchor bolt hole is reserved when the supporting base stone concrete of a pier top cap is poured, before the concrete reaches the designed strength and a bridge is erected, the position, the depth and the geometric dimension of the anchor bolt hole are verified to meet the design and specification requirements, and then the support embedded bolt is placed into the reserved hole to be filled, tamped and anchored. The existing anchoring material mostly adopts finished cement-based grouting material. The formulation of cement-based grouting material is different because of its required workability, but its main components are roughly composed of the following parts: cement, aggregate, a high-efficiency water reducing agent, a mineral admixture, a water-retaining agent, a coagulation regulator, an early strength agent, an expanding agent, a defoaming agent and the like. The properties of the grouting material can be adjusted by changing the ratio between different components.
The existing cement-based grouting material mainly has the following problems: the early strength is slow in development, is easily influenced by the environment, is easy to generate drying shrinkage, cracks and is insufficient in strength.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the invention provides the common cement-based grouting material for stabilizing the bottom plate of the bridge bearing.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
55-70 parts of ordinary portland cement, 50-100 parts of machine-made sand, 35-55 parts of a composite mineral admixture, 3-6 parts of basalt fiber, 1-3 parts of a polycarboxylic acid high-efficiency water reducing agent, 3-5 parts of a water-retaining agent, 6-10 parts of a modified expanding agent, 1-2 parts of a retarder and 2-3 parts of a defoaming agent;
the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is (5-7): 1;
the modified expanding agent is a polyethylene glycol coated modified calcium oxide expanding agent.
Preferably, the machine-made sand has a fineness modulus of 2.45 and an apparent density of 2.35g/cm 3 。
Preferably, the basalt fiber has a diameter of 3 to 5 μm and a length of 5 to 7 mm.
Preferably, the water retaining agent is one or a mixture of more of methylcellulose, hydroxypropyl cellulose and hydroxyethyl cellulose.
Preferably, the retarder is one or a combination of tartaric acid, sodium tartrate, citric acid, sodium citrate and sodium gluconate.
Preferably, in the above technical solution, the preparation method of the modified expanding agent comprises: mixing polyethylene glycol and ethanol, heating and stirring until the solid is completely dissolved, then adding calcium oxide, stirring to obtain a mixed solution, and then performing spray drying treatment on the obtained mixed solution by using a spray dryer to obtain the modified expanding agent.
Preferably, in the above technical solution, the mass ratio of the polyethylene glycol to the calcium oxide is 5: (1-2).
Preferably, the stirring speed when the heating and stirring are carried out until the solid is completely dissolved is 1000-2000 r/min, and the stirring temperature is 55 ℃.
In the above aspect, the hot air inlet temperature during the spray drying is preferably 120 ℃.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention provides a common cement-based grouting material for stabilizing a bridge support base plate, which comprises common Portland cement, machine-made sand, a composite mineral admixture, basalt fiber, a polycarboxylic acid high-efficiency water reducing agent, a water retaining agent, a modified expanding agent, a retarder, a defoaming agent and water. The basalt fiber and the modified expanding agent are added, the expansion effect in the plasticizing and hardening stages of the grouting material mainly comes from ettringite formed by expansion components in the mixture, the cracking risk caused by drying shrinkage of the material can be effectively reduced, but the internal microstructure of the expanded material is loose, a plurality of cracks are formed on the interfaces of cement paste and the cement paste and aggregate, after the basalt fiber and the modified expanding agent are matched with each other, the expansion effect of the modified expanding agent is inhibited by the basalt fiber in the matrix, the stress vertical to the length of the basalt fiber is generated in the expansion process, and the stress around the fiber can effectively improve the combination of the fiber and the matrix interface, so that the mechanical strength of the material is improved.
The invention adopts calcium oxide as the expanding agent, the cost is low, but the early expansion rate is higher, the early strength of the grouting material can be influenced, in order to solve the technical problem, the invention adopts polyethylene glycol to coat the calcium oxide to prepare the modified expanding agent, when the modified expanding agent is mixed with water, the polyethylene glycol can be slowly dissolved to expose the calcium oxide, thereby the calcium oxide reacts with the water to form ettringite, the material can be effectively prevented from suddenly expanding when the hydration starts, thereby the mechanical property of the material is improved,
Detailed Description
The invention is further illustrated by the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
The polyethylene glycol used in the following examples is polyethylene glycol 4000, the ethanol used is a 75% ethanol solution, and the mass ratio of the polyethylene glycol 4000 to the ethanol solution is controlled to be 1: (30-50), the specific mass ratio of the polyethylene glycol 4000 to the ethanol solution is preferably 1:30, 1:40 or 1: 50.
Example 1
The common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
60 parts of ordinary portland cement, 80 parts of machine-made sand, 40 parts of composite mineral admixture, 5 parts of basalt fiber, 2 parts of polycarboxylic acid high-efficiency water reducing agent, 4 parts of water-retaining agent, 7 parts of modified expanding agent, 1 part of retarder and 2 parts of defoaming agent;
wherein the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is 5: 1; the water-retaining agent is methyl cellulose; the retarder is tartaric acid;
the preparation method of the modified expanding agent comprises the following steps: mixing polyethylene glycol and ethanol, heating to 55 ℃, stirring at the rotating speed of 1000 rpm until the solid is completely dissolved, then adding calcium oxide, and controlling the mass ratio of the polyethylene glycol to the calcium oxide to be 5: 1, stirring to obtain a mixed solution, and then carrying out spray drying treatment on the obtained mixed solution by adopting a spray dryer to obtain the modified expanding agent.
Example 2
The common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
62 parts of ordinary portland cement, 65 parts of machine-made sand, 41 parts of a composite mineral admixture, 5 parts of basalt fiber, 2 parts of a polycarboxylic acid high-efficiency water reducing agent, 3 parts of a water-retaining agent, 7 parts of a modified expanding agent, 2 parts of a retarder and 2 parts of a defoaming agent;
wherein the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is 7: 1; the water-retaining agent is hydroxypropyl cellulose; the retarder is sodium tartrate;
the preparation method of the modified expanding agent comprises the following steps: mixing polyethylene glycol and ethanol, heating to 55 ℃, stirring at a rotating speed of 2000 rpm until the solid is completely dissolved, then adding calcium oxide, and controlling the mass ratio of the polyethylene glycol to the calcium oxide to be 5: 2, stirring to obtain a mixed solution, and then performing spray drying treatment on the obtained mixed solution by adopting a spray dryer to obtain the modified expanding agent.
Example 3
The common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
65 parts of ordinary portland cement, 85 parts of machine-made sand, 40 parts of composite mineral admixture, 4 parts of basalt fiber, 1 part of polycarboxylic acid high-efficiency water reducing agent, 3 parts of water-retaining agent, 10 parts of modified expanding agent, 1 part of retarder and 3 parts of defoaming agent;
wherein the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is 6: 1; the water-retaining agent is hydroxyethyl cellulose; the retarder is citric acid;
the preparation method of the modified expanding agent comprises the following steps: mixing polyethylene glycol and ethanol, heating to 55 ℃, stirring at the rotating speed of 1500 rpm until the solid is completely dissolved, then adding calcium oxide, and controlling the mass ratio of the polyethylene glycol to the calcium oxide to be 5: 1, stirring to obtain a mixed solution, and then carrying out spray drying treatment on the obtained mixed solution by adopting a spray dryer to obtain the modified expanding agent.
Example 4
The common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
70 parts of ordinary portland cement, 100 parts of machine-made sand, 55 parts of a composite mineral admixture, 6 parts of basalt fiber, 3 parts of a polycarboxylic acid high-efficiency water reducing agent, 5 parts of a water-retaining agent, 10 parts of a modified expanding agent, 2 parts of a retarder and 3 parts of a defoaming agent;
wherein the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is 5: 1; the water-retaining agent is hydroxypropyl cellulose; the retarder is sodium citrate;
the preparation method of the modified expanding agent comprises the following steps: mixing polyethylene glycol and ethanol, heating to 55 ℃, stirring at the rotating speed of 1000 rpm until the solid is completely dissolved, then adding calcium oxide, and controlling the mass ratio of the polyethylene glycol to the calcium oxide to be 5: 1, stirring to obtain a mixed solution, and then carrying out spray drying treatment on the obtained mixed solution by adopting a spray dryer to obtain the modified expanding agent.
Example 5
The common cement-based grouting material for stabilizing the bridge support base plate comprises the following components in parts by weight:
55 parts of ordinary portland cement, 70 parts of machine-made sand, 35 parts of composite mineral admixture, 3 parts of basalt fiber, 1 part of polycarboxylic acid high-efficiency water reducing agent, 3 parts of water-retaining agent, 6 parts of modified expanding agent, 1 part of retarder and 2 parts of defoaming agent;
wherein the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is 5: 1; the water-retaining agent is hydroxyethyl cellulose; the retarder is sodium gluconate;
the preparation method of the modified expanding agent comprises the following steps: mixing polyethylene glycol and ethanol, heating to 55 ℃, stirring at a rotating speed of 2000 rpm until the solid is completely dissolved, then adding calcium oxide, and controlling the mass ratio of the polyethylene glycol to the calcium oxide to be 5: 1, stirring to obtain a mixed solution, and then carrying out spray drying treatment on the obtained mixed solution by adopting a spray dryer to obtain the modified expanding agent.
Comparative example 1
The swelling agent was not modified with polyethylene glycol coating, and the other conditions were the same as in example 5.
Comparative example 2
Basalt fiber was not added, and other conditions were the same as in example 5.
Mixing the ordinary cement-based grouting material prepared in the above examples and comparative examples with water, controlling the water-material ratio to be 0.12, and performing performance test, slurry fluidity and strength test on the prepared slurry: according to the technical Specification for application of Cement-based grouting materials (GB/50448-. The test results are shown in table 1.
TABLE 1
From the test results, the cement-based grouting material prepared by the invention has good fluidity and excellent mechanical property, which is mainly due to the synergistic effect of the polyethylene glycol coated calcium oxide expanding agent and the basalt fiber.
Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (9)
1. The common cement-based grouting material for stabilizing the bridge support base plate is characterized by comprising the following components in parts by weight:
55-70 parts of ordinary portland cement, 50-100 parts of machine-made sand, 35-55 parts of a composite mineral admixture, 3-6 parts of basalt fiber, 1-3 parts of a polycarboxylic acid high-efficiency water reducing agent, 3-5 parts of a water-retaining agent, 6-10 parts of a modified expanding agent, 1-2 parts of a retarder and 2-3 parts of a defoaming agent;
the composite mineral admixture is a mixture of phosphorus slag powder and wollastonite powder, and the mass ratio of the phosphorus slag powder to the wollastonite powder is (5-7): 1;
the modified expanding agent is a polyethylene glycol coated modified calcium oxide expanding agent.
2. The portland cement-based grouting material for bridge bearing bottom plate stabilization according to claim 1, wherein the fineness modulus of the machine-made sand is 2.45, and the apparent density thereof is 2.35g/cm 3 。
3. The portland cement-based grouting material for bridge bearing bottom plate stabilization according to claim 1, wherein the basalt fiber has a diameter of 3-5 μm and a length of 5-7 mm.
4. The portland cement-based grouting material for bridge bearing bottom plate stabilization according to claim 1, wherein the water retention agent is one or more of methyl cellulose, hydroxypropyl cellulose and hydroxyethyl cellulose.
5. The portland cement-based grouting material for bridge support bottom plate stabilization according to claim 1, wherein the retarder is one or a combination of tartaric acid, sodium tartrate, citric acid, sodium citrate, and sodium gluconate.
6. The ordinary cement-based grouting material for bridge bearing bottom plate stabilization according to claim 1, characterized in that the preparation method of the modified expanding agent is as follows: mixing polyethylene glycol and ethanol, heating and stirring until the solid is completely dissolved, then adding calcium oxide, stirring to obtain a mixed solution, and then performing spray drying treatment on the obtained mixed solution by using a spray dryer to obtain the modified expanding agent.
7. The ordinary cement-based grouting material for bridge bearing bottom plate stabilization according to claim 6, wherein the mass ratio of polyethylene glycol to calcium oxide is 5: (1-2).
8. The ordinary cement-based grouting material for bridge bearing bottom plate stabilization as claimed in claim 6, wherein the stirring speed when the heating and stirring are carried out until the solid is completely dissolved is 1000-2000 rpm, and the stirring temperature is 55 ℃.
9. The portland cement-based grouting material for bridge bearer floor stabilization according to claim 6, wherein the hot air inlet temperature during the spray drying process is 120 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210695113.2A CN115057678A (en) | 2022-06-20 | 2022-06-20 | Ordinary cement-based grouting material for stabilizing bottom plate of bridge support |
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| CN202210695113.2A CN115057678A (en) | 2022-06-20 | 2022-06-20 | Ordinary cement-based grouting material for stabilizing bottom plate of bridge support |
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Cited By (1)
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| CN115925374A (en) * | 2022-11-24 | 2023-04-07 | 临海市忠信新型建材有限公司 | Quick-hardening early-strength cement-based grouting material for stabilizing bridge support base plate and preparation method thereof |
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