CN114835447A - Steel pipe constraint modified graded rubber concrete column and construction method thereof - Google Patents
Steel pipe constraint modified graded rubber concrete column and construction method thereof Download PDFInfo
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- CN114835447A CN114835447A CN202210271449.6A CN202210271449A CN114835447A CN 114835447 A CN114835447 A CN 114835447A CN 202210271449 A CN202210271449 A CN 202210271449A CN 114835447 A CN114835447 A CN 114835447A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
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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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- 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)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a steel tube constraint modified graded rubber concrete column and a construction method thereof, wherein the steel tube constraint modified graded rubber concrete column comprises 1-modified graded rubber concrete and 2-outer-layer steel tubes; the section shapes of the steel pipes comprise circles, squares, ellipses and the like; the modified graded rubber concrete can ensure continuous and complete grading of the fine aggregate containing the modified rubber powder before and after the modified rubber powder replaces the fine aggregate in the concrete. The invention is expected to improve the mechanical property and reduce the shrinkage of the rubber powder by optimizing the substitution mode of the rubber powder and introducing a surface modification technology. The steel pipe is adopted to provide axial restraint for the modified graded rubber concrete, and the modified graded rubber concrete is pushed to be applied to actual engineering as a main bearing member by multiple measures. Meanwhile, the steel pipe constraint modified graded rubber concrete column disclosed by the invention not only meets the requirement of bearing capacity, but also considers the requirements of ductility and earthquake resistance, and has obvious practical significance for environment and engineering.
Description
Technical Field
The invention relates to the field of green building materials and structural engineering, in particular to a steel tube constraint modified graded rubber concrete column and a construction method thereof.
Background
Currently, with the continuous promotion of urbanization in China, the demand for concrete will also continuously increase. Concrete is currently the most used building material, and worldwide annual consumption is reported to exceed 175 hundred million tons. The preparation of such a large volume of concrete consumes a large amount of natural coarse and fine aggregates. At present, the natural fine aggregate mainly comprises river sand, and the excessive exploitation of the river sand can bring about serious geological disasters. Also, with the prosperous development of the global transportation industry, the number of discarded waste tires is continuously increased in units of billions every year in the world. The pressure of the generation of a large amount of waste tires on the environment is undoubtedly unacceptable, but the treatment mode mainly comprises concentrated accumulation, and the occupation ratio of treatment through retreatment, burning heat energy supply and the like is small. Excessive waste tires are accumulated, not only a large amount of cultivated land is occupied, but also serious environmental pollution is brought. Some researchers put forward that the waste tires are ground to obtain rubber powder with different particle sizes, and the rubber powder is adopted to partially or completely replace natural aggregate, so that the promotion effect on relieving the problems of excessive waste tires and shortage of natural aggregate is achieved.
At present, the rubber concrete structure has the defects of low elastic modulus, poor interface bonding performance between rubber and cement paste, large shrinkage and the like, so that the application range of the rubber concrete structure is limited to be used in a non-main body structure. In the existing research, the substitution mode of the rubber powder destroys the continuity and integrity of the grading of the fine aggregate containing the rubber powder, and the rubber powder is bound to replace the natural fine aggregate, so that the concrete has serious degradation of mechanical property and large shrinkage.
Disclosure of Invention
In order to overcome the problems, the invention provides a steel tube restrained modified graded rubber concrete column and a construction method thereof. The column has strong ductility and energy consumption capability while taking bearing capacity into consideration, and has obvious environmental benefit by adopting a green concrete material.
The purpose of the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides a steel tube restrained modified graded rubber concrete column, which comprises modified graded rubber concrete and steel tubes with different cross-sectional shapes, wherein the modified graded rubber concrete is filled in the steel tubes, and the steel tubes provide lateral restraint for the steel tubes and serve as permanent templates of the steel tubes.
Preferably, the cross-sectional shape of the steel pipe is at least one of circular, square and oval, so as to meet the requirements of different engineering conditions.
Preferably, the cross-sectional shape of the steel pipe is at least one of rectangular, circular, oval, L-shaped and T-shaped, and the thickness is less than 40 mm.
Preferably, the modified graded rubber concrete is prepared by performing surface pretreatment on rubber powder by using a NaOH solution so as to improve the adhesive property between the rubber powder and cement paste and improve the mechanical and durable properties of the rubber concrete.
Preferably, the graded rubber powder is the substitution mode of optimized rubber powder, so that after the natural fine aggregate is substituted by the rubber powder, the continuity and the integrity of the fine aggregate grading containing the rubber powder in the concrete are ensured.
Preferably, the substitution mode of the optimized rubber powder is that the rubber powder with a specific particle size or a partially continuous particle size is used for substituting natural fine aggregate with the same particle size or the partially continuous particle size, and the original gradation is not damaged.
The invention provides a construction method of a steel pipe constraint modified graded rubber concrete column, which comprises the following steps:
step 1: randomly selecting 3 parts of natural fine aggregate samples to carry out screening experiments, counting the residual percentage of each sieve pore, and then carrying out averaging treatment on the results of the three experiments to obtain a grading curve of the natural fine aggregate;
step 2: sieving natural fine aggregate according to the size of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
and step 3: screening the modified rubber powder which is naturally dried for later use according to the screening of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75 mm;
and 4, step 4: selecting rubber powder with a specific particle size interval in the step 3 to replace the natural fine aggregate with a corresponding particle size interval in the step 2, and then supplementing the natural fine aggregate with the rest particle size intervals according to the grading curve of the natural fine aggregate determined in the step 1 to obtain the graded fine aggregate containing the rubber aggregate;
and 5: weighing cement according to a certain amount, mixing the cement with graded fine aggregate containing rubber aggregate, adding the mixture into a forced mixer, uniformly stirring, sequentially adding the weighed coarse aggregate, water and a water reducing agent, and uniformly stirring;
step 6: and immediately pouring the prepared modified graded rubber powder concrete into a steel pipe, fully vibrating the concrete in the steel pipe by adopting a vibrating rod, and periodically maintaining to finish construction.
Preferably, the concentration of the NaOH solution is 1mol/L, and the soaking time in the sodium hydroxide solution is 1 hour.
Preferably, in the step 2, the natural fine aggregate is natural river sand, the particle size is between 0.15 and 4.75mm, and the fineness modulus is 2.6 to 2.8.
Preferably, in the step 3, the rubber powder is formed by grinding waste tires, and the particle size ranges from 0.15 mm to 4.75 mm.
Preferably, in the step 5, the cement is P.O 42.5.5-grade ordinary portland cement.
Preferably, in the step 5, the natural coarse aggregate is crushed stone, the particle size is between 5 and 20mm, and the gradation is good.
Preferably, in the step 5, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Preferably, in the step 5, tap water meeting national standards is used as the water.
The beneficial effects of the invention are as follows:
(1) the modified graded rubber concrete used in the invention improves the adhesive property between the rubber powder and the cement paste and obviously improves the mechanical property of the rubber concrete by introducing the rubber powder surface modification technology. Meanwhile, the substitution mode of rubber powder for natural fine aggregate is optimized, so that the internal pore diameter distribution is more uniform, the gradation of the fine aggregate containing the rubber powder in the concrete is complete and continuous, the mechanical property of the rubber concrete is further improved, and the shrinkage performance of the rubber concrete is controlled.
(2) According to the invention, the steel tube constraint modified graded rubber concrete is adopted, so that the mechanical property of the modified graded rubber concrete is further improved by multiple measures, and the prepared steel tube constraint modified graded rubber concrete column has higher bearing capacity and higher impact resistance and shock resistance. The rubber concrete composite material also has the advantage of promoting the possibility of using rubber concrete in a main load-bearing structure, and can powerfully relieve the threat of the current excessive accumulation of waste tires to the environment and human health. Meanwhile, the steel pipe can also be used as a permanent template of rubber powder concrete, so that the construction process flow is greatly simplified, and the construction speed is accelerated. And moreover, the modified graded rubber concrete is restrained in the steel pipe, so that the volatilization of toxic gas generated by rubber at high temperature can be avoided, and the health of people is protected.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic structural view of a steel pipe constraint modified graded rubber concrete of example 1 of the present invention;
FIG. 2 is a schematic structural view of a steel pipe constraint modified graded rubber concrete in example 2 of the present invention;
FIG. 3 is a schematic structural view of a steel pipe constraint modified graded rubber concrete of example 3 of the present invention;
FIG. 4 is a schematic structural view of a steel pipe constraint modified graded rubber concrete of example 4 of the present invention;
FIG. 5 is a schematic structural view of a steel pipe constraint modified graded rubber concrete of example 5 of the present invention;
Detailed Description
The invention is further described with reference to the following examples.
Example 1:
a steel tube constraint modified graded rubber concrete column and a manufacturing method thereof are disclosed, as shown in figure 1, the preparation comprises the following steps:
step 1: randomly selecting 3 parts of natural fine aggregate samples to carry out screening experiments, counting the residual percentage of each sieve pore, and then carrying out averaging treatment on the results of the three experiments to obtain a grading curve of the natural fine aggregate;
step 2: sieving natural fine aggregate according to the size of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
and step 3: screening the modified rubber powder which is naturally dried for later use according to the screening of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75 mm;
and 4, step 4: selecting rubber powder with a specific particle size interval in the step 3 to replace the natural fine aggregate with a corresponding particle size interval in the step 2, and then supplementing the natural fine aggregate with the rest particle size intervals according to the grading curve of the natural fine aggregate determined in the step 1 to obtain the graded fine aggregate containing the rubber aggregate;
and 5: weighing cement according to a certain amount, mixing the cement with graded fine aggregate containing rubber aggregate, adding the mixture into a forced mixer, uniformly stirring, sequentially adding the weighed coarse aggregate, water and a water reducing agent, and uniformly stirring;
step 6: and immediately pouring the prepared modified graded rubber powder concrete into a 2-square steel tube, fully vibrating the concrete in the square steel tube by adopting a vibrating rod, and periodically maintaining to finish construction.
Example 2:
a modified graded rubber concrete column for steel pipes and a manufacturing method thereof are the same as those in example 1, and the only difference is that 3-round steel pipes are adopted, as shown in figure 2.
Example 3:
a steel pipe modified graded rubber concrete column and a manufacturing method thereof, the preparation process is the same as that of example 1, and the only difference is that 4-oval steel pipes are adopted, as shown in figure 3.
Example 4:
a modified graded rubber concrete column for steel pipes and a method for manufacturing the same, the preparation process is the same as that of example 1, and the only difference is that a 5-T-shaped steel pipe is adopted, as shown in figure 4.
Example 5:
a modified graded rubber concrete column for steel pipes and a method for manufacturing the same, the preparation process is the same as that of example 1, and the only difference is that a 6-L-shaped steel pipe is adopted, as shown in figure 5.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A steel tube constraint modified graded rubber concrete column and a construction method are characterized by comprising 1-modified graded rubber concrete and 2-steel tubes with different cross section shapes, wherein the modified graded rubber concrete is filled in the steel tubes, and the steel tubes provide lateral constraint for the steel tubes and serve as permanent templates of the steel tubes.
2. The steel tube constraint modified graded rubber concrete column and the construction method thereof as claimed in claim 1, wherein the cross-sectional shape of the steel tube is one of circular, square and oval, and the thickness is less than 40 mm.
3. The steel tube constraint modified graded rubber concrete column and the construction method thereof as claimed in claim 1, wherein the modified rubber is obtained by grinding waste tires and is subjected to surface modification treatment by soaking in 1M NaOH solution for 1 hour.
4. The steel tube confined modified graded rubber concrete column and the construction method thereof according to claim 1, wherein the preparation method of the modified graded rubber concrete comprises the following steps:
step 1: randomly selecting 3 parts of natural fine aggregate samples to carry out screening experiments, counting the residual percentage of each sieve pore, and then carrying out averaging treatment on the results of the three experiments to obtain a grading curve of the natural fine aggregate;
step 2: sieving natural fine aggregate according to the size of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
and step 3: screening the modified rubber powder which is naturally dried for later use according to the screening of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75 mm;
and 4, step 4: selecting rubber powder with a specific particle size interval in the step 3 to replace the natural fine aggregate with a corresponding particle size interval in the step 2, and then supplementing the natural fine aggregate with the rest particle size intervals according to the grading curve of the natural fine aggregate determined in the step 1 to obtain the graded fine aggregate containing the rubber aggregate;
and 5: weighing cement according to the amount, mixing the cement with the graded fine aggregate containing rubber aggregate, adding the mixture into a forced mixer, uniformly stirring, sequentially adding the weighed coarse aggregate, water and a water reducing agent, and uniformly stirring.
5. A steel tube constraint modified graded rubber concrete column and a construction method thereof are characterized in that the construction method of the steel tube modified graded rubber concrete column according to any one of claims 1 to 4 comprises the following steps:
step 1: preparing modified graded rubber powder concrete according to claim 4;
step 2: and immediately pouring the prepared modified graded rubber powder concrete into a steel pipe, fully vibrating the concrete in the steel pipe by adopting a vibrating rod, and periodically maintaining to finish construction.
6. The method for constructing the steel tube modified graded rubber concrete column as claimed in claim 5, wherein the concentration of the NaOH solution is 1mol/L, and the soaking time of the rubber powder in the sodium hydroxide solution is 1 h.
7. The method for constructing the steel tube modified graded rubber concrete column as claimed in claim 5, wherein in the step 1, the rubber powder is formed by grinding waste tires, and the particle size range is between 0 and 4.75 mm.
8. The method for constructing the steel tube modified graded rubber concrete column as claimed in claim 5, wherein in the step 3, natural river sand is adopted as the natural fine aggregate, the particle size is between 0 and 4.75mm, and the fineness modulus is 2.6 to 2.8.
9. The method for constructing the steel tube modified graded rubber concrete column as claimed in claim 5, wherein the natural coarse aggregate is crushed stone with a particle size of 5-20mm and good gradation, wherein the crushed stone with 5-10mm accounts for 37% and the crushed stone with 10-20mm accounts for 63%.
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Cited By (1)
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| CN116768559A (en) * | 2022-12-15 | 2023-09-19 | 广州大学 | Modified rubber concrete with high wet bulk density |
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| CN116768559B (en) * | 2022-12-15 | 2024-08-30 | 广州大学 | Modified rubber concrete with high wet bulk density |
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