CN114804756B - Continuous-grain-size graded rubber powder concrete and preparation method thereof - Google Patents
Continuous-grain-size graded rubber powder concrete and preparation method thereof Download PDFInfo
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- CN114804756B CN114804756B CN202210270341.5A CN202210270341A CN114804756B CN 114804756 B CN114804756 B CN 114804756B CN 202210270341 A CN202210270341 A CN 202210270341A CN 114804756 B CN114804756 B CN 114804756B
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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
- 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
- C04B18/18—Waste materials; Refuse organic
- C04B18/20—Waste materials; Refuse organic from macromolecular compounds
- C04B18/22—Rubber, e.g. ground waste tires
-
- 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
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses graded rubber powder concrete with continuous grain size and a preparation method thereof, wherein the graded rubber powder concrete with continuous grain size adopts rubber powder with continuous grain size interval to replace the corresponding grain size range in fine aggregate grading, and maintains the existing fine aggregate grading unchanged. The raw materials comprise: ordinary portland cement, river sand, rubber aggregate, naOH solution, broken stone and water. The invention aims to solve the problem that the complete gradation of fine aggregate containing rubber powder cannot be maintained before and after rubber aggregate replacement. The graded rubber concrete prepared by the method has the advantages of obviously improved working performance, obviously improved mechanical property, strong toughness and better durability. The method obtains the gradation rubber powder mixing proportion meeting the requirements of engineering practice and the preparation method thereof by maintaining the continuity and the integrity of the gradation of the fine aggregate containing the rubber powder. Provides new kinetic energy for solving the problems of difficult waste tire treatment and natural aggregate shortage.
Description
Technical Field
The invention relates to the field of novel building materials, in particular to graded rubber powder concrete with continuous particle size and a preparation method thereof.
Background
Currently, with the continuous development of the global transportation industry, the number of waste tires produced each year is in billions, and keeps on a trend of increasing year by year. Hundreds of millions of waste tires are conceivably stressed by the environment, and fire and bacteria are easily generated in the process of stacking the waste tires. Therefore, how to scientifically and effectively process the problem becomes a hot point for research of various researchers. Meanwhile, along with the rapid promotion of the urbanization process in China, the demand for natural aggregates also rises rapidly. If the waste tires are ground into rubber powder with a specific particle size to replace natural fine aggregate in concrete, a scientific treatment mode is sought for the treatment of the waste tires, and meanwhile troubles caused by the shortage of the natural aggregate can be relieved.
Rubber concrete is paid attention to by many scientific researchers by virtue of the advantages of high toughness, strong impact resistance and the like, and a series of experimental researches are carried out. However, after the rubber replaces the fine aggregate, the concrete is in a laying state with the problems of low compressive strength, large shrinkage, poor durability and the like, and is used for some non-bearing structures. The reason for this is mainly because the rubber has poor adhesion to the cement paste after being added, and the elastic modulus of the rubber itself is low.
In the existing research, rubber mainly replaces fine aggregate. In the existing research, full-graded natural fine aggregate is quantitatively replaced by fixed-particle-size or partially continuous graded rubber powder, and the substituted part of aggregate is discontinuous in the replacing mode, so that the internal pore size distribution of concrete is uneven, and the mechanical property is deteriorated.
Disclosure of Invention
Aiming at the problem that the continuous and complete gradation of fine aggregate containing rubber powder cannot be maintained after the rubber powder replaces natural fine aggregate in the existing research, the invention provides the gradation rubber concrete with fixed particle size and the preparation method thereof.
The purpose of the invention is realized by adopting the following technical scheme:
in a first aspect, the invention provides graded rubber powder concrete with continuous particle size, which comprises the following raw materials in parts by weight:
420 parts of cement, 553.5-615 parts of fine aggregate, 24.78 parts of rubber powder, 1194 parts of coarse aggregate and 210 parts of water.
Preferably, the cement is P · O42.5 portland cement.
Preferably, the fine aggregate is graded medium sand with a grading of 2 zones, and the fineness modulus is 2.69.
Preferably, the cumulative percent rejects of the fine aggregate are 4.75:2.36:1.18:0.60:0.30:0.15=0%:10.1%:29.2%:50.2%:79.4%:100 percent.
Preferably, the rubber powder is waste rubber powder, and the particle size ranges are 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75 mm.
Preferably, the coarse aggregate is crushed stone with a maximum particle size of 20mm, wherein about 37% of the crushed stone with a particle size of 5-10mm and about 63% of the crushed stone with a particle size of 10-20 mm.
In a second aspect, the present invention provides a method for preparing a graded rubber concrete with continuous particle size, comprising the steps of:
(1) Firstly, soaking rubber powder in NaOH solution, then cleaning with tap water until the PH value reaches 7, and airing the rubber powder for later use;
(2) And randomly selecting three fine aggregate samples with equal mass for a screening test, counting the residual percentage of each sieve pore, and averaging the results obtained by the three tests to obtain the grading curve of the fine aggregate in the test. The cumulative percent rejects of the fine aggregate were 4.75:2.36:1.18:0.60:0.30:0.15=0%:10.1%:29.2%:50.2%:79.4%:100 percent.
(3) Weighing the needed fine aggregate according to the weight, screening, and dividing into 5 sections of 0-0.30mm, 0.30-0.60mm, 0.60-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
(4) Weighing the rubber powder in two required adjacent particle size intervals according to the quantity, quantitatively replacing corresponding adjacent particle size sections in the 5 sections in the step (3), and mixing the residual fine aggregate according to the grading curve in the step (2) to obtain the graded fine aggregate containing the rubber aggregate;
(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 and water, and uniformly stirring;
(6) And (5) placing the concrete obtained in the step (5) into a mould, placing on a vibration table, vibrating uniformly, and performing standard curing to obtain the rubber concrete.
Preferably, the concentration of the NaOH solution is 1mol/L, and the NaOH solution is prepared by adopting sodium hydroxide flaky solids with solid content of 96%.
Preferably, the soaking time in the NaOH solution is 1 hour, and the stirring is performed 1 time every 10 minutes.
Preferably, the three fine aggregate samples are 500g in the sieve test.
The invention has the beneficial effects that:
1) Aiming at the problems of low compressive strength, poor durability, large contractibility and the like in the existing rubber concrete, the invention provides the graded rubber concrete with continuous particle size and the preparation method thereof. The method starts from the problem that the continuity of the grading of the substituted part cannot be ensured in the process of replacing the fine aggregate by the rubber aggregate, and provides the method for quantitatively replacing the corresponding section range in the grading of the fine aggregate particles by the rubber aggregate with continuous particle size, thereby ensuring the continuity of the grading of the fine aggregate before and after the substitution. The method is beneficial to reducing the degree of mechanical property deterioration caused by replacement of fine aggregate by rubber particles, improving the uniform distribution of the inner pore diameter of the rubber concrete, reducing the shrinkage of the rubber concrete and improving the mechanical property and the durability of the rubber concrete to a greater degree.
2) The invention replaces natural fine aggregate with rubber particles, which obviously improves the ductility and the shock resistance of the concrete, and simultaneously, further compensates the influence of the mechanical property reduction of the concrete caused by the addition of the rubber particles by optimizing the replacement mode of the rubber aggregate and adding the silica fume.
3) The rubber particles are obtained by reprocessing and reusing waste tires. The rubber particles replace natural fine aggregate in concrete, which is beneficial to reducing the consumption of the natural aggregate. Therefore, the invention actively responds to the policy of 'carbon peak reaching and carbon neutralization' proposed in China, and also provides reference for the treatment of waste tires and the solution of the problem of natural aggregate shortage.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but the present invention should not be construed as being limited to the implementable scope of the present invention.
The invention provides a substitution method of rubber particles with continuous particle size for specifically substituting a corresponding particle size range in natural fine aggregate gradation aiming at the problem that the continuity of substituted part gradation cannot be ensured in the process of substituting fine aggregates by rubber aggregates in the existing research. The substitution method ensures the continuous gradation of the rubber concrete to the maximum extent, and the rubber concrete with better mechanical property and durability is obtained.
The invention expects that the internal pore size distribution of the concrete is optimized and the mechanical and dynamic properties of the concrete are improved by adjusting the substitution mode of the rubber powder. Provides a substitution mode that the particle size of continuous rubber powder replaces the corresponding section range in fine aggregate gradation and the rest sections are maintained unchanged. The invention aims to provide a corresponding solution for solving the problem of the mechanical property degradation of rubber powder concrete and promote the further application of the rubber powder concrete in practical engineering. Meanwhile, corresponding reference and basis are expected to be provided for the subsequent development of the rubber powder concrete.
The invention firstly uses the rubber to replace partial particle grading, and provides the concept that the continuity of grading is ensured before and after the rubber particles replace the fine aggregate. The rubber graded concrete is obviously improved in the aspects of mechanical property, durability, contractibility and the like, and provides reference for the actual engineering application of the rubber concrete. Meanwhile, the invention actively responds to the national targets of carbon peak reaching and carbon neutralization and provides new kinetic energy for the reprocessing and recycling of waste tires and the problem of natural aggregate shortage.
The invention is further described with reference to the following examples.
Example 1
The graded rubber concrete with continuous grain diameter and the preparation method thereof comprise the following raw materials in parts by weight:
420 parts of cement, 553.5 parts of fine aggregate, 24.78 parts of rubber powder, 1194 parts of coarse aggregate and 210 parts of water. The rubber powder has particle diameter of 0-0.3mm and 0.3-0.6mm, and can replace 0-0.3mm and 0.3-0.6mm sections of natural fine aggregate.
The preparation method of the graded rubber concrete with continuous grain diameter comprises the following steps:
1) Firstly, rubber powder is put into 1M NaOH solution to be soaked for 1 hour, and is stirred for 1 time every 10 minutes; then, washing for several times by using tap water until the pH value reaches about 7; and finally, ventilating and drying the rubber powder for later use.
2) Randomly selecting 500g samples of 3 parts of fine aggregate to carry out a screening test, counting the residual percentage of each sieve pore, and then carrying out averaging treatment on the results obtained by the three tests to obtain a grading curve of the fine aggregate in the test;
3) Sieving all fine aggregates, and dividing into 5 sections of 0-0.30mm, 0.30-0.60mm, 0.60-1.18mm, 1.18-2.36mm, and 2.36-4.75mm for use.
4) Quantitatively replacing the sections of 0-0.3mm and 0.3-0.6mm in 3) with rubber powder with the particle size of 0-0.3mm and 0.3-0.6mm, and then mixing the fine aggregate according to the gradation curve in 2) to obtain the graded fine aggregate containing the rubber aggregate.
5) After weighing the raw materials in proportion, adding the cement and the fine aggregate containing the rubber aggregate into a forced mixer to be uniformly mixed, and then sequentially adding the coarse aggregate and the water to be uniformly mixed.
6) And (3) placing the concrete obtained in the step 5) into a mould, placing on a vibration table, vibrating uniformly, and performing standard curing to obtain the rubber concrete.
Example 2
The graded rubber concrete with continuous grain size and the preparation method are the same as the example 1, and are different from the grain size interval of the selected rubber powder, the grain size interval of the rubber powder is 0.3-0.6mm and 0.6-1.18mm, and the graded rubber concrete replaces the sections of 0.3-0.6mm and 0.6-1.18mm in the natural fine aggregate respectively.
Example 3
A graded rubber concrete with continuous particle size and a preparation method thereof are the same as example 1, and are different from the particle size interval of the selected rubber powder, wherein the particle size interval of the rubber powder is 0.6-1.18mm and 1.18-2.36mm, and the graded rubber concrete replaces the sections of 0.6-1.18mm and 1.18-2.36mm in natural fine aggregate respectively.
Example 4
The graded rubber concrete with continuous grain size and the preparation method thereof are the same as the example 1, and are different from the grain size interval of the selected rubber powder, the grain size interval of the rubber powder is 1.18-2.36mm and 2.36-4.75mm, and the graded rubber concrete replaces the sections of 1.18-2.36mm and 2.36-4.75mm in the natural fine aggregate respectively.
The results of the performance tests of the graded rubber concrete of fixed particle size prepared in different examples are shown in table 1 below:
TABLE 1 test results for fixed particle size graded rubber concrete of examples 1-4
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 (8)
1. The graded rubber powder concrete with continuous grain size is characterized by comprising the following raw materials in parts by weight:
420 parts of cement, 553.5-615 parts of fine aggregate, 1194 parts of coarse aggregate, 24.78 parts of rubber powder and 210 parts of water;
wherein the rubber powder with the grain diameter of 0-0.3mm and 0.3-0.6mm respectively replaces sections with the grain diameter of 0-0.3mm and 0.3-0.6mm in the natural fine aggregate; or the particle size interval of the rubber powder is 0.3-0.6mm and 0.6-1.18mm, and the rubber powder respectively replaces the sections of 0.3-0.6mm and 0.6-1.18mm in the natural fine aggregate; or the particle size interval of the rubber powder is 0.6-1.18mm and 1.18-2.36mm, and the rubber powder respectively replaces the sections of 0.6-1.18mm and 1.18-2.36mm in the natural fine aggregate; or the particle size interval of the rubber powder is 1.18-2.36mm and 2.36-4.75mm, and the rubber powder respectively replaces sections of 1.18-2.36mm and 2.36-4.75mm in the natural fine aggregate;
the graded rubber powder concrete with continuous grain size is prepared by the following preparation method, and the preparation method comprises the following steps:
(1) Firstly, soaking rubber powder in NaOH solution, then cleaning with tap water until the PH value reaches 7, and airing the rubber powder for later use;
(2) Randomly selecting three fine aggregate samples with equal mass to perform a screening test, counting the residual percentage of each sieve pore, and then averaging the results obtained by the three tests to obtain a grading curve of the fine aggregate in the test;
(3) Weighing the required fine aggregate according to the amount, screening, and dividing into 5 sections of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
(4) Quantitatively weighing rubber powder in adjacent particle size intervals, replacing corresponding particle size sections in the 5 sections in the step (3) according to the particle size of the rubber powder, and mixing fine aggregates according to the grading curve in the step (2) to obtain graded fine aggregates containing rubber aggregates;
(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;
(6) And (5) placing the concrete obtained in the step (5) into a mould, placing on a vibration table, vibrating uniformly, and performing standard curing to obtain the rubber concrete.
2. The continuous grain sized graded rubber powder concrete according to claim 1, wherein said cement is p.o42.5 portland cement.
3. The continuous grain size graded rubber powder concrete according to claim 1, wherein the fine aggregate is 2-zone graded medium sand with fineness modulus of 2.69.
4. The continuous grain graded rubber powder concrete of claim 1, wherein the rubber powder is ground from junked tires and has grain sizes ranging from 0 to 0.3mm, 0.3 to 0.6mm, 0.6 to 1.18mm, 1.18 to 2.36mm and 2.36 to 4.75 mm.
5. The continuous particle size graded rubber powder concrete according to claim 1, wherein the coarse aggregate is crushed stone with maximum particle size of 20mm, wherein the crushed stone is 37% of 5-10mm, and the crushed stone is 63% of 10-20 mm.
6. A method for preparing a graded rubber powder concrete of continuous particle size according to any one of claims 1 to 5, comprising the steps of:
(1) Firstly, soaking rubber powder in NaOH solution, then cleaning with tap water until the PH value reaches 7, and airing the rubber powder for later use;
(2) Randomly selecting three fine aggregate samples with equal mass to perform a screening test, counting the residual percentage of each sieve pore, and then averaging the results obtained by the three tests to obtain a grading curve of the fine aggregate in the test;
(3) Weighing the needed fine aggregate according to the amount, screening, and dividing into 5 sections of 0-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm for later use;
(4) Quantitatively weighing rubber powder in adjacent particle size intervals, replacing corresponding particle size sections in the 5 sections in the step (3) according to the particle size of the rubber powder, and mixing fine aggregates according to the grading curve in the step (2) to obtain graded fine aggregates containing rubber aggregates;
(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;
(6) And (5) placing the concrete obtained in the step (5) into a mould, placing on a vibration table, vibrating uniformly, and performing standard curing to obtain the rubber concrete.
7. The method for preparing graded rubber powder concrete with continuous particle size according to claim 6, wherein the concentration of NaOH solution is 1mol/L, and the graded rubber powder concrete is prepared by adopting sodium hydroxide flaky solid with solid content of 96%.
8. The method of claim 6, wherein the NaOH solution is soaked for 1 hour and the stirring is performed 1 time every 10 minutes.
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| US5391226A (en) * | 1992-04-23 | 1995-02-21 | Tiremix Corporation | Rubber-crumb-reinforced cement concrete |
| WO2021068118A1 (en) * | 2019-10-09 | 2021-04-15 | Royal Melbourne Institute For Technology | Rubber concrete product |
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| CN101519293A (en) * | 2009-04-10 | 2009-09-02 | 长江水利委员会长江科学院 | Rubber cement soil and preparation method thereof |
| CN104418546A (en) * | 2013-08-23 | 2015-03-18 | 张学花 | Hybrid concrete and preparation method thereof |
| JP6467087B1 (en) * | 2018-05-31 | 2019-02-06 | 英典 志田 | Asphalt mixture for thin pavement, repair method for paved road and paved road |
| CN111574088B (en) * | 2020-05-27 | 2021-12-07 | 洛阳理工学院 | Design method for mineral aggregate gradation of waste tire powder rubber asphalt mixture |
| CN113929376B (en) * | 2020-06-29 | 2022-09-09 | 比亚迪股份有限公司 | Rubber concrete, preparation method thereof and bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5391226A (en) * | 1992-04-23 | 1995-02-21 | Tiremix Corporation | Rubber-crumb-reinforced cement concrete |
| WO2021068118A1 (en) * | 2019-10-09 | 2021-04-15 | Royal Melbourne Institute For Technology | Rubber concrete product |
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