CN110642570A - Special mortar for pouring miniature pile and preparation method and application thereof - Google Patents
Special mortar for pouring miniature pile and preparation method and application thereof Download PDFInfo
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- CN110642570A CN110642570A CN201910911758.3A CN201910911758A CN110642570A CN 110642570 A CN110642570 A CN 110642570A CN 201910911758 A CN201910911758 A CN 201910911758A CN 110642570 A CN110642570 A CN 110642570A
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- 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
-
- 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 relates to special mortar for pouring a miniature pile, and a preparation method and application thereof. The special mortar is stable, free of layering and bleeding in the pouring process, low in viscosity after mixing, good in fluidity, easy to pump, low in gas content, guaranteed in strength, small in shrinkage after curing, suitable for pouring of micro-piles, free of grout supplementation during primary grouting and capable of guaranteeing the integrity of pile bodies. The mortar is not only suitable for pouring miniature piles, but also suitable for grouting construction of large-slenderness-ratio members such as anchor rods, soil nails and the like and structural reinforcement of damaged concrete members, so that the mortar has good practical application value.
Description
Technical Field
The invention belongs to the technical field of micro pile reinforcement of foundation foundations, and particularly relates to special mortar for micro pile pouring and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The micro pile is a cast-in-place pile with the diameter less than 300mm and the length-to-thickness ratio more than 30, which is constructed by adopting drilling, reinforcing bars and pressure grouting, and originates from Italy in the 50 th of the 20 th century, and is provided for solving the construction of the pile under the difficult condition. In the existing reinforcement of house foundations and bridge foundations, because of the height limitation and the operation surface limitation required by construction, small-sized machinery is used in construction, and the miniature piles are mostly miniature piles due to the characteristics of construction vibration, low noise, high bearing capacity, small settlement, convenience in construction, quickness in pile forming and the like.
The miniature pile body is characterized by small diameter, large slenderness ratio and strong reinforcement of the pile body material, and an inserted steel pipe is generally selected for improving the bearing capacity of the pile top part, so that the pile hole is narrow, and therefore, the filling material in the pile hole is generally building materials such as fine stone concrete, mortar, cement paste and the like. When the material is fine stone concrete, the construction can not be carried out according to a normal underwater concrete conduit method, coarse and fine aggregates are easy to be layered, and the strength of a pile body is reduced and uneven; when the materials are mortar and cement paste, a pile end grouting process is generally adopted, a large water cement ratio is needed for increasing the fluidity of the paste, the shrinkage rate of a pile body is large, a cavity at the top of the pile is formed seriously due to bleeding, the grouting can be completed for multiple times, a generated new interface and an old interface are pile breaking signals during the integrity detection of the pile body, and the engineering pile cannot be normally accepted.
The national standard specifications related to the design and construction of the micro-piles comprise ' construction foundation treatment technical specification ' JGJ79 ' and ' existing construction foundation reinforcement technical specification ' JGJ123 ', wherein 9.2.4.1 of the JGJ79 have better workability, plasticity, cohesiveness, fluidity and self-compactness ' on the requirements of a pouring material. However, the inventor finds that the specification requirements are wide, no specific technical standard or technical index exists, the water-cement ratio in specific construction is about 0.6 or even higher for increasing the fluidity, gravel bottom sinking is easily caused, and the difference between the upper part and the lower part of the pile body strength is serious.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the special mortar for pouring the miniature pile and the preparation method and the application thereof. Meanwhile, the raw materials used by the invention are all commercial products, are easy to obtain, and can be widely applied to foundation reinforcement of buildings, micro piles in foundation pit support, anchor rod grouting construction and the like, so that the invention has good practical application value.
The invention aims to provide special mortar for pouring a micro pile.
The second purpose of the invention is to provide a preparation method of the special mortar for pouring the micro-pile.
The invention also aims to provide application of the special mortar for pouring the micro-pile.
The invention is realized by the following technical scheme:
the invention provides a special mortar for pouring a micro pile, which comprises the following raw materials:
ordinary portland cement, quartz sand, mineral powder or fly ash and an additive.
The additive comprises a polycarboxylic acid water reducing agent, a plastic expanding agent, a defoaming agent, a tackifier and a mineral viscosity reducer, wherein the tackifier is one or a combination of more of cellulose ether, polysaccharide, polyacrylamide and sheet silicate, and the mineral viscosity reducer is first-grade fly ash or micro-bead ultrafine fly ash.
Further, the special mortar for pouring the miniature pile comprises the following raw materials in parts by weight: 400 parts of quartz sand 200, 80-120 parts of ordinary portland cement, 30-60 parts of mineral powder (s95), 20-50 parts of mineral viscosity reducer, 0.4-0.8 part of polycarboxylic acid water reducer, 1-5 parts of early strength agent, 0.4-1.0 part of tackifier, 0.1-0.5 part of plastic expanding agent and 0.4-0.8 part of defoaming agent.
The second aspect of the invention provides a preparation method of special mortar for pouring a micro pile, which comprises the following steps:
mixing the measured common Portland cement, quartz sand, mineral powder or fly ash admixture and an additive into uniform powder;
and gradually adding the uniform powder into the metered water, and mechanically stirring.
Further, the water-to-glue ratio is 0.25-0.45, and more preferably 0.29-0.41; further included is 0.3, 0.35 or 0.4.
The invention also provides the application of the special mortar for pouring the micro-pile in micro-pile body pouring, grouting construction of a member with a large slenderness ratio and/or structural reinforcement of a damaged concrete member.
The invention has the beneficial effects that:
(1) the special mortar is stable, free of layering and bleeding in the pouring process, low in viscosity after mixing, good in fluidity, easy to pump, low in gas content, guaranteed in strength, small in shrinkage after curing, suitable for pouring of micro-piles, free of grout supplementation during primary grouting and capable of guaranteeing the integrity of pile bodies.
(2) The preparation method is simple, has universality for components with low shrinkage and high strength requirements, is easy for large-scale production of powder, and has a simple field construction process, so that the preparation method has a good value in practical application.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It is to be understood that the scope of the invention is not to be limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
As introduced in the background art, the micro-pile grouting mortar has the requirements of high fluidity, linearity, low shrinkage and high strength, and is prepared from special mortar prepared from mixed powder of ordinary portland cement, quartz sand, mineral powder or fly ash additive and additive, so that the micro-pile grouting mortar is not only suitable for micro-pile grouting, but also suitable for grouting construction of large-slenderness-ratio components such as anchor rods, soil nails and the like and structural reinforcement of damaged concrete components.
In an exemplary embodiment of the present invention, a special mortar for pouring a micro pile is provided, which comprises the following raw materials: ordinary portland cement, quartz sand, mineral powder or fly ash and an additive.
The additive comprises a polycarboxylic acid water reducing agent, a plastic expanding agent, a defoaming agent, a tackifier and a mineral viscosity reducer, wherein the tackifier is one or a combination of more of cellulose ether, polysaccharide, polyacrylamide and sheet silicate. The mineral viscosity reducer is first-grade fly ash or micro-bead ultrafine fly ash.
In another embodiment of the present invention, the special mortar for pouring the micro pile comprises the following raw materials (by weight portion): 400 parts of quartz sand 200, 80-120 parts of ordinary portland cement, 30-60 parts of mineral powder (s95), 20-50 parts of mineral viscosity reducer, 0.4-0.8 part of polycarboxylic acid water reducer, 1-5 parts of early strength agent, 0.4-1.0 part of tackifier, 0.1-0.5 part of plastic expanding agent and 0.4-0.8 part of defoaming agent.
The research of the invention finds that: the high fluidity of the mortar is improved by adding a certain proportion of polycarboxylic acid water reducing agent, the stability of the mortar is improved by adding a certain proportion of tackifier, the low shrinkage requirement of the mortar is improved by adding a certain proportion of plastic expanding agent, the fluidity and the gel time before the mortar is cured meet the pouring requirement, the mortar after being cured has high 28d strength and low volume shrinkage, and the poured micro pile does not need secondary slurry supplement.
It should be noted that the performance of the special mortar for pouring the high-performance micro-pile finally prepared by the invention is greatly influenced by the proportioning and using amount of the raw materials, if the using amount of the carboxylic acid water reducing agent is too much, the mortar is suitable for layering, the using amount is too little, and the flowability is poor; if the dosage of the tackifier is too much, the viscosity of the mortar is high, and the fluidity is reduced. In the cement hydration process, the plastic expanding agent can be continuously decomposed to generate nitrogen under the catalysis of alkali metal to achieve the expansion effect, the expansion requirements in 3h and 24h stages are met, and the mixing amount is too large to influence the mortar strength.
In another embodiment of the present invention, a method for preparing special mortar for pouring a micro pile is provided, which includes:
mixing the measured common Portland cement, quartz sand, mineral powder or fly ash admixture and an additive into uniform powder;
and gradually adding the uniform powder into the metered water, and mechanically stirring.
In another embodiment of the present invention, the water-to-glue ratio is 0.25 to 0.45, and more preferably 0.29 to 0.41; further included is 0.3, 0.35 or 0.4.
In another embodiment of the invention, in the mechanical stirring, the linear speed of the impeller is 0.5-1m/s, the mortar powder is gradually added, the feeding time is preferably controlled to be 1.0-1.5min, the linear speed of the stirring impeller is adjusted to 10m/s after the feeding is finished, and the timing is started to stir for 5 min.
In another embodiment of the present invention, the special mortar for pouring the micro pile is used for pouring the micro pile body, grouting a member with a large slenderness ratio, and/or reinforcing a structure of a damaged concrete member.
The scheme of the application is described by specific examples below. The technical indexes of the micro-pile mortar meet the requirements of construction of 'construction foundation treatment technical Specification' JGJ79 and 'existing construction foundation reinforcement technical Specification' JGJ123 micro-piles:
(1) fluidity: mortar fluidity (flow cone), initial not more than 45s, 30min not more than 60s, (2) bleeding rate: 0, (3) coagulation time: 3-9h, (4) apparent density: not less than 1800kg/m3(5) vertical expansion ratio: the free expansion rate of 24h is 0-1%, (6) the curing strength: 28d is more than 30 MPa.
Measuring the initial 30min fluidity of the mortar by using a cement consistometer (flow cone); standing the mortar in a stirring barrel for 30min, observing the state of the mortar, and stirring for 2 min; the vertical expansion rate of the mortar is determined according to the technical Specification for concrete additive application GB 50119; the mortar setting time refers to JC/T727' determination method for standard consistency and setting time of cement paste. The molding and strength test of the mortar test piece refer to the standard "cement mortar strength test method (ISO method)" GB/T17671. The yield stress and plastic viscosity of the mortar rheological property are measured by an STSC-1 cement slurry consistometer.
Example 1
(1) Preparing raw materials
100g of ordinary portland cement, 35g of mineral powder (S95), 20g of first-grade fly ash mineral viscosity reducer, 0.8g of polycarboxylic acid water reducer, 2g of early strength agent, 0.6g of cellulose ether tackifier, 0.15g of plastic expanding agent, 0.5g of defoaming agent and 200g of quartz sand.
(2) And (3) uniformly mixing the components according to the formula to obtain powder, and gradually adding the uniform powder into metered water to be mechanically stirred. In the mechanical stirring, the linear velocity of the impeller is 1m/s, the feeding time is controlled within 1.5min, the linear velocity of the stirring impeller is adjusted to 10m/s after the feeding is finished, the timing is started, and the stirring is carried out for 5 min.
The water-to-glue ratio is 0.30 +/-0.01, the mortar has good fluidity and stable slurry, and has vertical expansion, the vertical expansion rate is more than 0.2 percent, and the 28d strength is more than 60 Mpa.
Example 2
(1) Preparing raw materials
100g of ordinary portland cement, 40g of mineral powder (S95), 25g of first-grade fly ash mineral viscosity reducer, 0.7g of polycarboxylic acid water reducer, 2g of early strength agent, 0.6g of cellulose ether tackifier, 0.2g of plastic expanding agent, 0.5g of defoaming agent and 250g of quartz sand (iron tailing sand).
(2) And (3) uniformly mixing the components according to the formula to obtain powder, and gradually adding the uniform powder into metered water to be mechanically stirred. In the mechanical stirring, the linear velocity of the impeller is 1m/s, the feeding time is controlled within 1.5min, the linear velocity of the stirring impeller is adjusted to 10m/s after the feeding is finished, the timing is started, and the stirring is carried out for 5 min.
The water-to-glue ratio is 0.36 +/-0.01, the mortar has good fluidity and stable slurry, and has vertical expansion, the vertical expansion rate is more than 0.2 percent, and the 28d strength is more than 50 Mpa.
Example 3
(1) Preparing raw materials
100g of ordinary portland cement, 45g of fly ash (grade 2), 25g of first-grade fly ash mineral viscosity reducer, 0.5g of polycarboxylic acid water reducer, 3.5g of early strength agent, 0.6g of cellulose ether tackifier, 0.2g of plastic expanding agent, 0.5g of defoaming agent and 350g of quartz sand (iron tailing sand).
(2) And (3) uniformly mixing the components according to the formula to obtain powder, and gradually adding the uniform powder into metered water to be mechanically stirred. In the mechanical stirring, the linear velocity of the impeller is 1m/s, the feeding time is controlled within 1.5min, the linear velocity of the stirring impeller is adjusted to 10m/s after the feeding is finished, the timing is started, and the stirring is carried out for 5 min.
The water-to-glue ratio is 0.4 +/-0.01, the mortar has good fluidity and stable slurry, and has vertical expansion, the vertical expansion rate is more than 0.2 percent, and the strength (28d) is more than 40 Mpa.
Experimental example 1
0.5g of plastic expanding agent in the raw materials prepared in the embodiment 1 is changed, the other components are the same, the water-cement ratio is the same, the 24-hour expansion rate of the mortar is 0.613%, and the 28d compressive strength is 36.2 MPa.
Experimental example 2
The preparation method changes the conditions that 0.17g of cellulose ether tackifier, the other components and the water-cement ratio in the preparation raw materials of the embodiment 2 are the same, the initial fluidity of mortar is 35s, the fluidity of mortar is 37s in 30min, and the mixture is 30 min: bleeding, layering and bottom scraping.
Experimental example 3
The preparation method changes the conditions that 0.8g of the polycarboxylic acid water reducing agent in the raw materials prepared in the embodiment 3 is changed, the other components are the same, the water-cement ratio is 0.49 +/-0.01, the initial fluidity of the mortar is 30s, the fluidity of the mortar is 34s in 30min, and the mixture is in a state of 30 min: bleeding and serious delamination.
Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The special mortar for pouring the miniature pile is characterized by comprising the following raw materials: ordinary portland cement, quartz sand, mineral powder or fly ash and an additive.
2. The special mortar for pouring the micropile according to claim 1, wherein the additive comprises a polycarboxylic acid water reducing agent, a plastic expanding agent, an antifoaming agent, a tackifier and a mineral viscosity reducer.
3. The special mortar for pouring the micropile according to claim 2, wherein the tackifier is one or more of cellulose ether, polysaccharide, polyacrylamide and sheet silicate; the mineral viscosity reducer is first-grade fly ash or micro-bead ultrafine fly ash.
4. A special mortar for pouring a micropile according to claim 1, wherein the raw materials comprise (in parts by weight): 400 parts of quartz sand 200, 80-120 parts of ordinary portland cement, 30-60 parts of mineral powder (s95), 20-50 parts of mineral viscosity reducer, 0.4-0.8 part of polycarboxylic acid water reducer, 1-5 parts of early strength agent, 0.4-1.0 part of tackifier, 0.1-0.5 part of plastic expanding agent and 0.4-0.8 part of defoaming agent.
5. A method for preparing special mortar for pouring a micropile according to any one of claims 1 to 4, comprising:
mixing the measured common Portland cement, quartz sand, mineral powder or fly ash admixture and an additive into uniform powder;
and gradually adding uniform powder into the metered water, and mechanically stirring.
6. The method of claim 5, wherein the water-to-glue ratio is 0.25 to 0.45.
7. The method of claim 6, wherein the water-to-glue ratio is 0.29 to 0.41; preferably 0.3, 0.35 or 0.4.
8. The process according to claim 5, wherein the linear speed of the impeller is 0.5 to 1m/s and the feeding time is preferably 1.0 to 1.5min in the mechanical agitation.
9. The method according to claim 8, wherein the linear velocity of the stirring impeller is adjusted to 10m/s after the completion of the addition, and the stirring is started for 5 min.
10. The use of the special mortar for pouring a micro-pile according to any one of claims 1 to 4 in micro-pile body pouring, grouting construction of a member with a large slenderness ratio and/or structural reinforcement of a damaged concrete member.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112299791A (en) * | 2020-11-16 | 2021-02-02 | 上海宝冶工程技术有限公司 | Non-ignition concrete floor material |
| CN115849841A (en) * | 2022-12-12 | 2023-03-28 | 中建八局第三建设有限公司 | Sleeve grouting material suitable for quick connection of intelligent assembling bridge fabrication machine |
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| CN115849841A (en) * | 2022-12-12 | 2023-03-28 | 中建八局第三建设有限公司 | Sleeve grouting material suitable for quick connection of intelligent assembling bridge fabrication machine |
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