CN114477889B - Thin-wall concrete pipe pile - Google Patents
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- CN114477889B CN114477889B CN202111584968.XA CN202111584968A CN114477889B CN 114477889 B CN114477889 B CN 114477889B CN 202111584968 A CN202111584968 A CN 202111584968A CN 114477889 B CN114477889 B CN 114477889B
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
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- 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
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The application belongs to the technical field of concrete pipe piles, and particularly relates to a thin-wall concrete pipe pile which comprises the following components in parts by weight: 300-500 parts of cement, 100-150 parts of mineral admixture, 600-800 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 100-150 parts of reinforcing fiber, 10-20 parts of water reducing agent, 5-10 parts of hydroxypropyl methyl cellulose ether and 140-200 parts of water; before the reinforcing fiber is added, silane coupling agent is used for modification treatment. The application discloses thin-walled concrete tubular pile, replace part cement through adding mineral admixture, improve gel material's activity through mineral admixture, increase the volcanic ash reaction, generate calcium silicate hydrate, improve the bulk strength of concrete, in addition, add hydroxypropyl methyl cellulose ether, improve the effect of moisturizing when improving the adhesion between each component, reinforcing fiber adds the reinforcing fiber that silane coupling agent handled simultaneously, silane coupling agent can be connected reinforcing fiber and hydroxypropyl methyl cellulose ether, form three-dimensional network structure, improve the concrete strength, improve crack resistance.
Description
Technical Field
The application belongs to the technical field of concrete pipe piles, and particularly relates to a thin-wall concrete pipe pile.
Background
The tubular pile is used for transferring the load of an upper building to a soil layer with stronger deep bearing capacity or compacting a soft soil layer to improve the bearing capacity and compactness of foundation soil, and is mainly applied to the fields of railways, industrial and civil buildings, municipal administration, metallurgy, ports, roads and the like.
Chinese patent application document CN 103496891A discloses a batching for facilitating demoulding of a concrete pipe pile and a preparation method thereof, the batching for the concrete pipe pile comprises 18-23% of cement, 3-6% of admixture, 30-40% of sand, 20-30% of stone, 5-8% of water reducing agent, 2-4% of oiliness agent and 7-10% of water, the pipe pile obtained by the formula is convenient for demoulding, the defects of sand sticking, sand falling and the like in the traditional method are overcome, and the forming quality of the pipe pile is ensured. However, the concrete pipe pile prepared by the ingredients is easy to have the problem of low strength, so that powerful guarantee cannot be provided for superstructure.
For the above reasons, it is necessary to develop a new thin-wall concrete pipe pile with high strength and crack resistance to meet the increasingly stringent requirements of the construction industry.
Disclosure of Invention
In order to solve the problems, the application discloses a thin-wall concrete pipe pile, a part of cement is replaced by adding a mineral admixture, the activity of a gel material is improved by the mineral admixture, the volcanic ash reaction is increased, calcium silicate hydrate is generated, the overall strength of the concrete is improved, in addition, hydroxypropyl methyl cellulose ether is added, the cohesive force among all the components is improved, the water retention effect is improved, meanwhile, reinforcing fibers treated by a silane coupling agent are added into the reinforcing fibers, and the silane coupling agent can connect the reinforcing fibers and the hydroxypropyl methyl cellulose ether to form a three-dimensional network structure, so that the strength of the concrete is improved, and the crack resistance is improved.
The application provides a thin wall concrete pipe pile adopts following technical scheme:
a thin-wall concrete pipe pile comprises the following components in parts by weight:
300-500 parts of cement
100-150 parts of mineral admixture
600-800 parts of fine aggregate
1000-1200 parts of coarse aggregate
100-150 parts of reinforced fiber
10-20 parts of water reducing agent
5-10 parts of hydroxypropyl methyl cellulose ether
140-200 parts of water;
before the reinforcing fiber is added, silane coupling agent is used for modification treatment.
Optionally, the silane coupling agent is a corrosion-resistant silane coupling agent, and the structural formula of the corrosion-resistant silane coupling agent is as follows:
the corrosion-resistant silane coupling agent is introduced with the zinc chelate, so that zinc is introduced into concrete through the modified reinforced fibers, a good electrochemical corrosion prevention effect is achieved, the zinc introduced in the coupling agent mode can be well dispersed in the whole concrete system through the dispersion of the reinforced fibers, the phenomenon of particle aggregation caused by the direct addition of zinc powder is avoided, and a better corrosion prevention effect is achieved.
The preparation method of the corrosion-resistant silane coupling agent comprises the following steps:
(1) Adding 3-carbonyl-7 octenoic acid methyl ester, phenanthroline and sodium hydroxide in a molar ratio of 1:
(2) Dissolving the zinc chelate prepared in the step (1) in N, N-dimethylformamide, adding triethoxysilane which has a molar ratio of 1:1 to the zinc chelate and 30ppm of platinum catalyst, heating to 85 ℃ under stirring for reaction for 8 hours, performing pressure filtration to remove the catalyst, distilling and recovering the N, N-dimethylformamide, washing a product with ethanol, and drying to obtain the corrosion-resistant silane coupling agent, wherein the reaction equation is as follows:
optionally, the modification treatment method comprises: dissolving the corrosion-resistant silane coupling agent in an aqueous solution of N, N-dimethylformamide, performing ultrasonic treatment for 2-5min, adding the reinforced fiber, continuing ultrasonic treatment for 10-30min, filtering, washing and drying to obtain the modified reinforced fiber.
Optionally, the reinforcing fibers are steel fibers.
Optionally, the mineral admixture is a mixture of silica fume and slag powder.
The content of active silicon dioxide in the silica fume reaches 85-95%, the silica fume can quickly interact with calcium hydroxide in concrete to generate hydrated calcium silicate and generate strength, and meanwhile, the silica fume has certain water absorption, so that the cohesiveness of the concrete is improved, the concrete is not easy to bleed or separate, and the working performance of the concrete is improved; however, the slag powder can effectively improve the chlorine ion corrosion resistance of the concrete, can improve the compactness of the concrete, and has better effects on improving the strength, the impermeability and the frost resistance of the concrete. In addition, the slag powder has a spherical vitreous body structure, so that the internal friction of the concrete can be obviously reduced, the fluidity of the concrete is improved, and the working performance of the concrete is improved.
Optionally, the mass ratio of the silica fume to the slag powder is 1:2.
The selection is with the more slag powder of less lime-silica collocation, not only multiplicable volcanic ash activity, be favorable to the increase of strength, and the finer lime-silica of accessible fineness carries out effectual packing to the gap of materials such as cement, improves the compactedness of concrete to the hydroscopicity through the lime-silica improves the cohesiveness between the interface, but the lime-silica quantity is too high then can lead to cohesiveness too big, influences the workability, produces the hardening shrinkage moreover easily, easy fracture.
Optionally, the fine aggregate is high-alumina clinker, and the particle size of the fine aggregate is less than 5mm.
The high-aluminum clinker has higher aluminum content, can obviously improve the corrosion resistance of the concrete pipe pile, and ensures that the prepared concrete pipe pile has excellent corrosion resistance.
Optionally, the coarse aggregate is crushed stone with the particle size of 5-20mm in a continuous grading manner.
Optionally, the water reducing agent is a polycarboxylic acid water reducing agent.
Optionally, the preparation method comprises the following steps:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, removing the pipe pile mould after the demoulding standard is met, and then lifting the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
The application has the following beneficial effects:
(1) The application discloses thin-walled concrete tubular pile, replace part cement through adding mineral admixture, improve gel material's activity through mineral admixture, increase the volcanic ash reaction, generate calcium silicate hydrate, improve the bulk strength of concrete, in addition, add hydroxypropyl methyl cellulose ether, improve the effect of moisturizing when improving the adhesion between each component, reinforcing fiber adds the reinforcing fiber that silane coupling agent handled simultaneously, silane coupling agent can be connected reinforcing fiber and hydroxypropyl methyl cellulose ether, form three-dimensional network structure, improve the concrete strength, improve crack resistance.
(2) This application modification treatment reinforcing fiber used silane coupling agent is corrosion resistance silane coupling agent, zinc chelate has been introduced in this corrosion resistance silane coupling agent to introduce zinc to the concrete through modification treatment's reinforcing fiber, play good electrochemistry corrosion protection effect, can well disperse in whole concrete system through reinforcing fiber's dispersion with the zinc that the coupling agent mode was introduced, avoid directly adding zinc powder and the phenomenon of granule gathering appears, thereby play better corrosion protection.
(3) The mixture of the silica fume and the slag powder is used as a mineral admixture to replace part of cement, the content of active silicon dioxide in the silica fume reaches 85-95%, the silica fume can quickly interact with calcium hydroxide in concrete to generate hydrated calcium silicate and generate strength, and meanwhile, the silica fume has certain water absorption, so that the cohesiveness of the concrete is improved, the concrete is not easy to bleed or separate, and the working performance of the concrete is improved; however, the slag powder can effectively improve the chloride ion corrosion resistance of the concrete, can improve the compactness of the concrete, and has better effects on improving the strength, impermeability and frost resistance of the concrete. In addition, the slag powder has a spherical vitreous body structure, so that the internal friction of the concrete can be obviously reduced, the fluidity of the concrete is improved, and the working performance of the concrete is improved.
Detailed Description
The present application will now be described in further detail with reference to examples.
The cement used in the examples and comparative examples of the present application was portland cement with a surface area of 3800m 2 About/kg, and the tricalcium aluminate accounts for about 5 percent by mass; the specific surface area of the silica fume in the mineral admixture is 16000m 2 About/kg, the slag powder is II-grade levigated slag powder; the fine aggregate is high-alumina clinker with the grain diameter less than 5mm; the coarse aggregate is crushed stone with 5-20mm grain size continuous gradation; the reinforced fiber is corrugated steel fiber with length of 10-50mm and diameter of 0.1-0.5mm.
The method for modifying the corrosion-resistant silane coupling agent modified reinforcing fiber comprises the following steps: dissolving the corrosion-resistant silane coupling agent in an aqueous solution of N, N-dimethylformamide, performing ultrasonic treatment for 5min, adding the reinforced fiber, performing ultrasonic treatment for 20min, filtering, washing and drying to obtain the corrosion-resistant silane coupling agent modified reinforced fiber, wherein the corrosion-resistant silane coupling agent accounts for 2% of the total mass of the reinforced fiber.
The modification treatment method of the KH570 modified reinforced fiber comprises the following steps: dissolving a silane coupling agent KH570 in an ethanol water solution, performing ultrasonic treatment for 5min, then adding the reinforced fiber, performing ultrasonic treatment for 20min, filtering, washing and drying to obtain the KH570 modified reinforced fiber, wherein the silane coupling agent KH570 accounts for 2% of the total mass of the reinforced fiber.
Example 1
Preparing raw materials: 300kg of cement, 100kg of mineral admixture (wherein the mass ratio of silica fume to slag powder is 1:2), 600kg of fine aggregate (the fine aggregate is high-alumina clinker), 1000kg of coarse aggregate, 100kg of corrosion-resistant silane coupling agent modified reinforcing fiber, 10kg of polycarboxylic acid water reducing agent, 5kg of hydroxypropyl methyl cellulose ether and 140kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, removing the pipe pile mould after the demoulding standard is met, and then lifting the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Example 2
Preparing raw materials: 500kg of cement, 150kg of mineral admixture (wherein the mass ratio of silica fume to slag powder is 1:2), 800kg of fine aggregate (the fine aggregate is high-alumina clinker), 1200kg of coarse aggregate, 150kg of corrosion-resistant silane coupling agent modified reinforcing fiber, 20kg of polycarboxylic acid water reducing agent, 10kg of hydroxypropyl methyl cellulose ether and 200kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, dismantling the pipe pile mould after the demoulding standard is met, and then hanging the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Example 3
Preparing raw materials: 400kg of cement, 125kg of mineral admixture (wherein the mass ratio of silica fume to slag powder is 1:2), 700kg of fine aggregate (the fine aggregate is high-alumina clinker), 1100kg of coarse aggregate, 125kg of corrosion-resistant silane coupling agent modified reinforcing fiber, 15kg of polycarboxylic acid water reducing agent, 8kg of hydroxypropyl methyl cellulose ether and 170kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, dismantling the pipe pile mould after the demoulding standard is met, and then hanging the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Example 4
Preparing raw materials: 400kg of cement, 125kg of mineral admixture (wherein the mass ratio of silica fume to slag powder is 2:1), 700kg of fine aggregate (the fine aggregate is high-alumina clinker), 1100kg of coarse aggregate, 125kg of corrosion-resistant silane coupling agent modified reinforcing fiber, 15kg of polycarboxylic acid water reducing agent, 8kg of hydroxypropyl methyl cellulose ether and 170kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, removing the pipe pile mould after the demoulding standard is met, and then lifting the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Example 5
Preparing raw materials: 400kg of cement, 125kg of mineral admixture (wherein the mass ratio of silica fume to slag powder is 1:2), 700kg of fine aggregate (the fine aggregate is quartz sand), 1100kg of coarse aggregate, 125kg of corrosion-resistant silane coupling agent modified reinforcing fiber, 15kg of polycarboxylic acid water reducing agent, 8kg of hydroxypropyl methyl cellulose ether and 170kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, dismantling the pipe pile mould after the demoulding standard is met, and then hanging the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Example 6
Preparing raw materials: 400kg of cement, 125kg of mineral admixture (wherein the mass ratio of the silica fume to the slag powder is 1:2), 700kg of fine aggregate (the fine aggregate is high-alumina clinker), 1100kg of coarse aggregate, 125kg of KH570 modified reinforcing fiber, 15kg of polycarboxylic acid water reducing agent, 8kg of hydroxypropyl methyl cellulose ether and 170kg of water.
The thin-wall concrete pipe pile is prepared by the following method:
(1) Preparing concrete: the method comprises the following steps of (1) carrying out dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, removing the pipe pile mould after the demoulding standard is met, and then lifting the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
Comparative example 1 is essentially the same as example 3, except that: the mineral admixture used in comparative example 1 contained no silica fume.
Comparative example 2 is essentially the same as example 3, except that: the mineral admixture used in comparative example 21 contained no slag powder.
Comparative example 3 is essentially the same as example 3, except that: comparative example 3 the corrosion-resistant silane coupling agent modified reinforcing fiber of example 3 was replaced with an unmodified reinforcing fiber.
Comparative example 4 is substantially the same as comparative example 3 except that: comparative example 4 a portion of the unmodified reinforcing fibers of comparative example 3 were replaced with zinc fines in an amount equal to the amount of zinc chelate of example 3.
Comparative example 5 is essentially the same as example 3, except that: in comparative example 5, hydroxypropyl methylcellulose ether was not added and the amount of cement used was 408 parts.
The concrete prepared in examples 1 to 6 and comparative examples 1 to 5 were subjected to performance tests, and the test results are shown in table 1.
TABLE 1
The method for testing the corrosion resistance comprises the following steps: and (3) carrying out local pressurization and permeation on the concrete pipe pile by using a hydrochloric acid solution with the concentration of 30%, wherein the permeation time is 1 month, cutting 1cm of reinforcing steel bars at the permeation part of the hydrochloric acid solution after the permeation is finished, comparing the reinforcing steel bars with 1cm of reinforcing steel bars at the non-permeation part, cutting three sections of reinforcing steel bars at each part, taking an average value, and recording results in the last two columns in the table 1.
As can be seen from Table 1, the concrete prepared by the embodiments has higher compressive strength and tensile strength, and after the corrosion resistance test, the weight loss of the steel bar is less, and the corrosion resistance is better.
From example 4, it can be seen that when the mass ratio of silica fume to slag powder in the mineral admixture used in example 4 is 2:1, the compressive strength and tensile strength are both significantly reduced as compared to example 3, and the weight loss of the steel bar is increased, which may be due to the shrinkage cracks easily generated by adding excessive silica fume, the tensile strength is reduced, the impermeability is reduced, the corrosion resistance is reduced, and in addition, the increase of silica fume causes the slag powder to be reduced, which is detrimental to the strength and corrosion resistance of the concrete.
It can be seen from example 5 that, when the fine aggregate used in example 5 is quartz sand, the compressive strength and tensile strength are reduced to some extent, and the weight loss of the steel bar is increased significantly, which is probably because the high alumina clinker can improve the binding property of the concrete to some extent, and the high alumina clinker can improve the corrosion resistance of the concrete, and the strength is reduced to some extent and the corrosion resistance is reduced significantly after the quartz sand is replaced.
It can be seen from example 6 that when the KH570 modified reinforcing fiber is used instead of the corrosion-resistant silane coupling agent modified reinforcing fiber in example 6, the weight loss of the reinforcing bar is significantly increased, which is probably due to the loss of the function of chelating zinc, resulting in inferior corrosion prevention performance as compared to example 3.
It can be seen from comparative example 1 that when the mineral admixture used in comparative example 1 does not contain silica fume, the compressive strength and tensile strength of the concrete prepared are both significantly reduced, keeping up with the increase in weight loss. This is probably because the pozzolanic activity of the concrete as a whole is reduced due to no addition of silica fume, and the cohesiveness between the components is reduced, which is not favorable for the formation of dense, high-strength concrete, thus resulting in a reduction in strength, and the impermeability is reduced, thus resulting in a reduction in corrosion resistance.
It can be seen from comparative example 2 that when the mineral admixture used in comparative example 2 does not contain slag powder, the compressive strength and tensile strength of the prepared concrete are both significantly reduced, and the weight loss of the reinforcing steel bar is significantly increased. This is probably because the concrete strength is not improved due to the fact that no slag powder is added, and cracks are easily generated due to excessive silica fume, so that the strength is reduced, the impermeability is reduced, and the corrosion resistance is poor.
It can be seen from comparative example 3 that when unmodified reinforcing fiber is used in comparative example 3, a significant decrease in both compressive strength and tensile strength is caused, and the weight loss of the reinforcing bar is significantly increased. This is probably because silane coupling agent cannot be introduced into unmodified reinforcing fiber, and inorganic fiber material and organic hydroxypropyl methyl cellulose ether material cannot be connected, so that three-dimensional network structure cannot be well formed among fiber, hydroxypropyl methyl cellulose ether and gel material of system, and the connection effect among the components is poor, resulting in low strength, easy cracking and poor corrosion resistance.
As can be seen from comparative example 4, when part of the unmodified reinforcing fibers in comparative example 3 was replaced with zinc powder in an amount equivalent to the amount of chelated zinc in example 3 in comparative example 4, the corrosion prevention performance was further lowered than in comparative example 3. This is probably because, although comparative example 4 supplemented with zinc which can function as an electrochemical corrosion inhibitor in the form of zinc powder, the corrosion inhibitor was not as effective as the silane coupling agent since the zinc powder was difficult to disperse uniformly and was easily lost.
From comparative example 5, it is understood that when the hydroxypropyl methylcellulose ether material is replaced with equal mass of cement (i.e., the amount of cement is adjusted to 408kg without adding hydroxypropyl methylcellulose ether material) in comparative example 5, the decrease in compressive strength and tensile strength is significant, and the weight loss of the reinforcing bar is increased. This is probably because the addition of the hydroxypropyl methyl cellulose ether material does not result in a three-dimensional network structure which cannot have good performance with silane coupling agents, reinforcing fibers, gel materials and the like, so that the compressive strength and the tensile strength of the concrete are both obviously reduced.
The present embodiment is merely illustrative and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The utility model provides a thin wall concrete pipe pile which characterized in that: the paint comprises the following components in parts by weight:
300-500 parts of cement
100-150 parts of mineral admixture
600-800 parts of fine aggregate
1000-1200 parts of coarse aggregate
100-150 parts of reinforced fiber
10-20 parts of water reducing agent
5-10 parts of hydroxypropyl methyl cellulose ether
140-200 parts of water;
before the reinforcing fiber is added, a silane coupling agent is used for modification treatment;
the silane coupling agent is a corrosion-resistant silane coupling agent, and the structural formula of the corrosion-resistant silane coupling agent is as follows:
the preparation method of the corrosion-resistant silane coupling agent comprises the following steps:
(1) Adding 3-carbonyl-7 octenoic acid methyl ester, phenanthroline and sodium hydroxide in a molar ratio of 1:
(2) Dissolving the zinc chelate prepared in the step (1) in N, N-dimethylformamide, adding triethoxysilane which has a molar ratio of 1:1 to the zinc chelate and 30ppm of platinum catalyst, heating to 85 ℃ under stirring to react for 8h, removing the catalyst by pressure filtration, distilling and recovering the N, N-dimethylformamide, washing a product with ethanol, and drying to obtain the corrosion-resistant silane coupling agent, wherein the reaction equation is as follows:
2. the thin-walled concrete pipe pile of claim 1, wherein: the modification treatment method comprises the following steps: dissolving the corrosion-resistant silane coupling agent in an aqueous solution of N, N-dimethylformamide, performing ultrasonic treatment for 2-5min, adding the reinforced fiber, continuing ultrasonic treatment for 10-30min, filtering, washing and drying to obtain the modified reinforced fiber.
3. The thin-walled concrete pipe pile of claim 1, wherein: the reinforcing fiber is steel fiber.
4. The thin-walled concrete pipe pile of claim 1, wherein: the mineral admixture is a mixture of silica fume and slag powder.
5. The thin-walled concrete pipe pile of claim 4, wherein: the mass ratio of the silica fume to the slag powder is 1:2.
6. The thin-walled concrete pipe pile of claim 1, wherein: the fine aggregate is high alumina clinker, and the grain diameter is less than 5mm.
7. The thin-walled concrete pipe pile of claim 1, wherein: the coarse aggregate is crushed stone with the grain diameter of 5-20mm in a continuous grading manner.
8. The thin-walled concrete pipe pile of claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
9. The thin-walled concrete pipe pile of claim 1, wherein: the preparation method comprises the following steps:
(1) Preparing concrete: the method comprises the following steps of (1) performing dry mixing on cement, mineral admixture, fine aggregate, coarse aggregate and reinforcing fiber, then adding a water reducing agent, hydroxypropyl methyl cellulose ether and water, and uniformly stirring and mixing to obtain concrete for later use;
(2) Manufacturing a thin-wall pile: pouring the concrete prepared in the step (1) into a pipe pile die, closing the die, fixing, performing prestress stretching, and then performing centrifugal molding; and (3) putting the formed concrete pipe pile and the mould I into a steam curing cabinet for steam curing, removing the pipe pile mould after the demoulding standard is met, and then lifting the concrete pipe pile into a high-pressure steam furnace for high-pressure steam curing for a period of time.
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| EP2067753A1 (en) * | 2007-12-03 | 2009-06-10 | Lafarge SA | Concrete Mix |
| CN111517718A (en) * | 2020-04-26 | 2020-08-11 | 上海兆捷实业发展有限公司 | Steel fiber high-strength concrete and preparation method thereof |
| CN113248208A (en) * | 2021-06-07 | 2021-08-13 | 天津建城基业管桩有限公司 | Steam-curing-free high-strength anti-corrosion tubular pile and preparation method thereof |
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| CN109369076B (en) * | 2018-11-21 | 2021-09-07 | 杭州金鼎实业有限公司 | Concrete and preparation method thereof |
| KR102124771B1 (en) * | 2019-12-13 | 2020-06-22 | 김봉기 | High-functional and eco-friendly mortar composition for protecting surface of wet and underwater concrete structures and method of repairing and reinforcing concrete structure using the same |
| CN113735520B (en) * | 2021-09-14 | 2022-08-30 | 深圳市永恒业混凝土有限公司 | Anti-cracking recycled concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2067753A1 (en) * | 2007-12-03 | 2009-06-10 | Lafarge SA | Concrete Mix |
| CN111517718A (en) * | 2020-04-26 | 2020-08-11 | 上海兆捷实业发展有限公司 | Steel fiber high-strength concrete and preparation method thereof |
| CN113248208A (en) * | 2021-06-07 | 2021-08-13 | 天津建城基业管桩有限公司 | Steam-curing-free high-strength anti-corrosion tubular pile and preparation method thereof |
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