CN114560655A - Pavement base material and preparation method thereof - Google Patents
Pavement base material and preparation method thereof Download PDFInfo
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- CN114560655A CN114560655A CN202210241796.4A CN202210241796A CN114560655A CN 114560655 A CN114560655 A CN 114560655A CN 202210241796 A CN202210241796 A CN 202210241796A CN 114560655 A CN114560655 A CN 114560655A
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- base material
- polypropylene fiber
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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
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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
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
Abstract
The application relates to the field of building materials, and particularly discloses a pavement base material and a preparation method thereof. A pavement base material is prepared from the following raw materials in percentage by weight: 5-7% of cement, 3-3.5% of modified polypropylene fiber, 6-8% of water and the balance of aggregate; the aggregate comprises river sand, broken stone and steel slag, and the river sand: crushing stone: the mass ratio of the steel slag is 1: (1.5-2.5): (6-8); the modified polypropylene fiber is obtained by modifying the surface roughness of sodium acrylate and silicon dioxide particles of polypropylene fiber; the preparation method comprises the following steps: mixing and stirring river sand, broken stone and steel slag to obtain a solid mixture; adding modified polypropylene fiber into water while stirring to obtain a mixed solution; and adding the mixed solution and cement into the solid mixture and stirring to obtain the pavement base material. The pavement base material has the advantage of improving the crack resistance of the pavement base material.
Description
Technical Field
The application relates to the field of building materials, in particular to a pavement base material and a preparation method thereof.
Background
The road base in China mostly adopts semi-rigid road base materials, and cement stabilizing bases in the semi-rigid road base materials have enough mechanical strength and good water resistance, so that the cement stabilizing bases are widely used. However, the roadbed can be unevenly deformed after long-term use, at the moment, the bottom of the semi-rigid base layer is subjected to larger tensile stress of the bottom layer, and the semi-rigid base layer is easy to crack due to lower tensile strength of the semi-rigid base layer material. Once the base layer is cracked, the surface layer structure on the base layer is damaged more, so that the improvement of the crack resistance of the semi-rigid pavement base layer material is very important.
Disclosure of Invention
In order to improve the crack resistance of the pavement base material, the application provides the pavement base material and a preparation method thereof.
In a first aspect, the present application provides a pavement base material, which adopts the following technical scheme:
a pavement base material is prepared from the following raw materials in percentage by weight:
5-7% of cement, 3-3.5% of modified polypropylene fiber, 6-8% of water and the balance of aggregate;
the aggregate comprises river sand, broken stone and steel slag, and the aggregate comprises the following components: crushing stone: the mass ratio of the steel slag is 1: (1.5-2.5): (6-8);
the modified polypropylene fiber is obtained by modifying the surface roughness of sodium acrylate and silicon dioxide particles of polypropylene fiber.
By adopting the technical scheme, the pavement base material with the compressive strength meeting the construction requirement can be obtained by adopting 5-7% by weight of cement as the raw material. The steel slag, river sand and crushed stone are graded as aggregate, the steel slag is a byproduct generated in the steel-making production process, the recycling of the steel slag is always an important content of a sustainable development strategy, and is one of important research directions in domestic and foreign building materials. The steel slag has high iron content, good strength, hardness, wear resistance and impact resistance, and contains mineral components similar to portland cement clinker, so that the steel slag has hydraulic activity which common sandstone does not have. In addition, the steel slag has better freezing resistance and corrosion resistance, and can improve the freezing resistance and the corrosion resistance of the pavement base material.
More importantly, compared with river sand, the steel slag and the broken stone have rough outer peripheral surfaces and a plurality of edges and corners, and the steel slag and the broken stone can be mutually embedded in a matching manner, so that the connection among aggregate particles is enhanced, the integrity of the pavement base material is improved, cracks generated due to separation of components of the pavement base material are reduced, and the anti-cracking performance of the pavement base material is improved. And the steel slag and the broken stones are matched with the river sand with smooth and round surfaces, so that the mixing resistance of the aggregate and the cement can be properly reduced, and the aggregate and the cement can be fully mixed.
The polypropylene fiber can effectively improve the crack resistance of the pavement base material, and after the surfaces of the polypropylene fiber are modified roughly by sodium acrylate and silicon dioxide particles, carboxylate radicals and hydroxyl radicals are introduced to the surfaces of the polypropylene fiber by the sodium acrylate and the silicon dioxide, so that the hydrophilicity of the surfaces of the polypropylene fiber is greatly improved, and the dispersibility of the modified polypropylene fiber in the cement-stabilized base material is improved. And the silica particles are coated on the surface of the modified polypropylene fiber, so that the surface of the modified polypropylene fiber is uneven, the modified polypropylene fiber can be embedded with aggregate, the connection between cement and the aggregate is enhanced, the integrity of the pavement base material is further improved, and the crack resistance of the pavement base material is greatly improved. The surface of the modified polypropylene fiber is coated with silica particles, and the silica particles can block partial pores of the pavement base material, so that the possibility of water evaporation is reduced, and the possibility of cracking of the pavement base material caused by volume shrinkage due to water reduction is reduced; thereby effectively improving the crack resistance of the pavement base material.
Optionally, the modified polypropylene fiber is obtained by modifying the following raw materials in parts by weight:
200 parts of sodium acrylate 180-.
By adopting the technical scheme, sodium acrylate and polypropylene fiber are polymerized under the action of the initiator, so that the coating of the silicon dioxide small particles on the surface of the acrylic fiber is realized, and the roughening modification of the surface of the polypropylene fiber is realized.
Optionally, the raw material of the modified polypropylene fiber further comprises 80-100 parts by weight of graphene oxide.
By adopting the technical scheme, the graphene oxide can be coated on the surface of the polypropylene fiber under the action of sodium acrylate, and carboxyl and hydroxyl are introduced into the polypropylene fiber, so that the hydrophilicity of the modified polypropylene fiber is further improved, the polypropylene fiber has better compatibility with substances such as cement and the like, the polypropylene fiber is more uniformly dispersed, and the overall tensile property of the finally obtained pavement base material is better; in addition, when the silicon dioxide and the sodium acrylate act, carboxyl on the graphene oxide acts with silicon dioxide particles, and hydroxyl acts with the sodium acrylate, so that the adhesion strength of sodium acrylate modified sodium carbonate and polypropylene fibers is higher, the stability of aggregates such as steel slag and the like and the polypropylene fibers loaded with the silicon dioxide after the aggregates are wedged is better, in addition, the tensile strength of the modified polypropylene fibers can be effectively improved through the honeycomb-shaped special structure of the graphene oxide, and the applicant finds that the crack resistance of the pavement base can be further improved after the graphene oxide is added into the raw materials possibly through multiple actions.
Optionally, the modified polypropylene fiber is prepared by a method comprising the following steps:
preparing modified silicon dioxide: adding silica particles into water with the weight percentage of 70-75 percent of the total weight of the water, stirring, heating to 70-80 ℃ to obtain suspension, adding sodium acrylate with the weight percentage of 30-35 percent of the total weight of the sodium acrylate into the suspension while stirring, heating to 90-95 ℃, continuously stirring for 1-1.5h, filtering and drying to obtain modified silica;
preparing modified polypropylene fiber: mixing and stirring polypropylene fiber, the rest of water, xylene and the rest of sodium acrylate, heating to 50-55 ℃, and swelling for 85-95min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 90-95 ℃, adding modified silicon dioxide and an initiator into the basic mixed solution while stirring, continuously stirring for 2-3h, cooling and filtering to obtain the modified polypropylene fiber.
By adopting the technical scheme, the silicon dioxide small particles and the graphene oxide can be coated on the surface of the polypropylene fiber in an European manner by a coating method, so that the modified polypropylene fiber with rough surface is formed.
Optionally, 80-100 parts by weight of graphene oxide is added in the step of preparing the modified polypropylene fiber; and heating the basic mixed solution to 90-95 ℃, adding graphene oxide, modified silicon dioxide and an initiator into the basic mixed solution while stirring, continuously stirring for 2-3h, cooling and filtering to obtain the modified polypropylene fiber.
By adopting the technical scheme, the graphene oxide and the silicon dioxide particles can be coated on the surface of the polypropylene fiber to form the modified polypropylene fiber.
Optionally, the crushed stone is 10-15mm crushed stone; the steel slag is 0.075mm-19mm continuous graded steel slag; the river sand is continuous graded river sand with the grain size of 0.075mm-5 mm.
By adopting the technical scheme, the 10-15mm broken stone can form good gradation with steel slag and river sand, and the compressive strength and integrity of the pavement base material are enhanced, so that the crack resistance of the pavement base material is improved; the steel slag can form good gradation, and the steel slag and the broken stone form good gradation; the river sand, the steel slag and the broken stones form good grading, so that gaps among large particles can be filled by medium particles, gaps among the medium particles can be filled by small particles, and the compressive strength and the integrity of the pavement integrated material are enhanced.
Optionally, the river sand: crushing stone: the mass ratio of the steel slag is 1:2: 7.
by adopting the technical scheme, when the mass ratio of the river sand, the broken stone and the steel slag is 1:2:7, excellent gradation can be formed, so that the pavement base material obtains excellent compressive strength and integrity, the possibility of cracking of the pavement base material caused by stress is reduced, and the crack resistance of the pavement base material is improved.
Optionally, the cement is composite Portland P.C32.5 cement.
By adopting the technical scheme, the cement is the composite Portland P.C32.5 cement, has excellent flexural strength and compressive strength, and can improve the flexural strength and the compressive strength of the pavement base material.
In a second aspect, the present application provides a method for preparing a pavement base material, which adopts the following technical scheme: a preparation method of a pavement base material comprises the following steps:
preparation of a solid mixture: mixing and stirring river sand, broken stone and steel slag to obtain a solid mixture;
preparing a mixed solution: adding modified polypropylene fiber into water while stirring to obtain a mixed solution;
preparing a pavement base material: and adding the mixed solution and cement into the solid mixture and stirring to obtain the pavement base material.
By adopting the technical scheme, the river sand, the broken stone and the steel slag are uniformly stirred and then the modified polypropylene fiber is added, so that the friction between the modified polypropylene fiber and the granular aggregate is reduced, and the possibility that the small silicon dioxide particles on the surface of the modified polypropylene fiber fall off due to friction is reduced.
In summary, the present application has the following beneficial effects:
1. because the steel slag and the modified polypropylene fiber are adopted, the integrity of the pavement base material is greatly enhanced and the crack resistance of the pavement base material is improved due to the cooperation of the steel slag and the modified polypropylene fiber; and the silica particles coated on the surface of the modified polypropylene fiber can block gaps in the pavement base material and reduce the possibility of water evaporation, so that the crack resistance of the pavement base material is improved.
2. The modified polypropylene fiber is obtained by modifying polypropylene fiber through sodium acrylate and silicon dioxide, and the sodium acrylate and the silicon dioxide provide carboxyl and hydroxyl for the modified polypropylene fiber, so that the modified polypropylene fiber can be better dispersed in cement, the integrity of the pavement base material is further improved, and the crack resistance of the pavement base material is further improved.
3. The original modified polypropylene fiber also comprises graphene oxide, the hydrophilicity of the modified polypropylene fiber is further improved by the graphene oxide, and the tensile strength of the modified polypropylene fiber can be effectively improved by the honeycomb-shaped special structure of the graphene oxide.
4. River sand in this application: crushing stone: the mass ratio of the steel slag is 1: (1.5-2.5): (6-8), the river sand, the broken stone and the steel slag form good grading in the range, so that the pavement base material obtains excellent compressive strength and integrity, the possibility of cracking of the pavement base material due to stress is reduced, and the crack resistance of the pavement base material is improved.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
The initiator is benzoyl peroxide.
Preparation example of modified Polypropylene fiber
Preparation example 1
A preparation method of modified polypropylene fiber comprises the following steps:
preparing modified silicon dioxide: adding 90kg of silicon dioxide particles into 105kg of water, stirring, heating to 70 ℃ to obtain a suspension, adding 54kg of sodium acrylate into the suspension while stirring, heating to 90 ℃, continuously stirring for 1h, filtering and drying to obtain modified silicon dioxide;
preparing modified polypropylene fiber: mixing 60kg of polypropylene fiber, 45kg of water, 40kg of dimethylbenzene and 126kg of sodium acrylate, stirring, heating to 50 ℃, and swelling for 85min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 90 ℃, adding modified silicon dioxide and 2.5kg of initiator into the basic mixed solution while stirring, continuously stirring for 2 hours, cooling and filtering to obtain the modified polypropylene fiber.
Preparation example 2
A preparation method of modified polypropylene fibers comprises the following steps:
preparing modified silicon dioxide: adding 110kg of silicon dioxide particles into 135kg of water, stirring, heating to 80 ℃ to obtain a suspension, adding 70kg of sodium acrylate into the suspension while stirring, heating to 95 ℃, continuously stirring for 1.5h, filtering and drying to obtain modified silicon dioxide;
preparing modified polypropylene fiber: mixing 80kg of polypropylene fiber, 45kg of water, 50kg of dimethylbenzene and 130kg of sodium acrylate, stirring, heating to 55 ℃, and swelling for 95min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 95 ℃, adding modified silicon dioxide and 3.5kg of initiator into the basic mixed solution while stirring, continuously stirring for 3h, cooling and filtering to obtain the modified polypropylene fiber.
Preparation example 3
A preparation method of modified polypropylene fiber comprises the following steps:
preparing modified silicon dioxide: adding 100kg of silicon dioxide particles into 110kg of water, stirring, heating to 70 ℃ to obtain a suspension, adding 65kg of sodium acrylate into the suspension while stirring, heating to 90 ℃, continuously stirring for 1h, filtering and drying to obtain modified silicon dioxide;
preparing modified polypropylene fiber: mixing 70kg of polypropylene fiber, 50kg of water, 45kg of dimethylbenzene and 125kg of sodium acrylate, stirring, heating to 55 ℃, and swelling for 90min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 95 ℃, adding modified silicon dioxide and 3kg of initiator into the basic mixed solution while stirring, continuously stirring for 2.5h, cooling and filtering to obtain the modified polypropylene fiber.
Preparation example 4
A preparation method of modified polypropylene fiber comprises the following steps:
preparing modified silicon dioxide: adding 100kg of silicon dioxide particles into 110kg of water, stirring, heating to 70 ℃ to obtain a suspension, adding 65kg of sodium acrylate into the suspension while stirring, heating to 90 ℃, continuously stirring for 1h, filtering and drying to obtain modified silicon dioxide;
preparing modified polypropylene fiber: mixing and stirring 70kg of polypropylene fiber, 50kg of water, 45kg of dimethylbenzene, 125kg of sodium acrylate and 80kg of graphene oxide, heating to 55 ℃, and swelling for 90min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 95 ℃, adding modified silicon dioxide and 3kg of initiator into the basic mixed solution while stirring, continuously stirring for 2.5h, cooling and filtering to obtain the modified polypropylene fiber.
Preparation example 5
A preparation method of modified polypropylene fibers is carried out according to the method in preparation example 4, and is characterized in that the addition amount of graphene oxide in raw materials is 100 kg.
Preparation example 6
A preparation method of modified polypropylene fibers is carried out according to the method in preparation example 4, except that the addition amount of graphene oxide in raw materials is 90 kg.
Preparation example 7
A preparation method of a modified polypropylene fiber is carried out according to the method in preparation example 6, and is characterized in that 90kg of graphene oxide and the like in the raw materials are replaced by 90kg of graphene.
Preparation example 8
A preparation method of modified polypropylene fibers is carried out according to the method in preparation example 6, and is characterized in that 90kg of graphene oxide and the like in raw materials are replaced by 90kg of tartaric acid.
Examples
Example 1
A preparation method of a pavement base material comprises the following steps:
preparation of a solid mixture: mixing and stirring 102kg of river sand, 152kg of broken stone and 606kg of steel slag to obtain a solid mixture; preparing a mixed solution: 30kg of the modified polypropylene fiber obtained by the method of production example 1 was added to 60kg of water with stirring to obtain a mixed solution;
preparing a pavement base material: and adding the mixed solution and 50kg of cement into the solid mixture, and stirring to obtain the pavement base material.
Example 2
A preparation method of a pavement base material comprises the following steps:
preparation of a solid mixture: mixing and stirring 71kg of river sand, 178kg of broken stone and 566kg of steel slag to obtain a solid mixture; preparing a mixed solution: adding 35kg of the modified polypropylene fiber obtained by the method of preparation example 2 to 80kg of water while stirring to obtain a mixed solution;
preparing a pavement base material: and adding the mixed solution and 70kg of cement into the solid mixture, and stirring to obtain the pavement base material.
Example 3
A preparation method of a pavement base material comprises the following steps:
preparation of a solid mixture: mixing 84kg of river sand, 168kg of broken stone and 588kg of steel slag, and stirring to obtain a solid mixture; preparing a mixed solution: 30kg of the modified polypropylene fiber obtained by the method of production example 3 was added to 70kg of water with stirring to obtain a mixed solution;
preparing a pavement base material: and adding the mixed solution and 60kg of cement into the solid mixture, and stirring to obtain the pavement base material.
Example 4
A method for producing a road base material, which was carried out in accordance with the method in example 3, except that modified polypropylene fibers as a raw material were obtained in accordance with the method in production example 4.
Example 5
A preparation method of a pavement base material, which is carried out according to the method in the embodiment 3, except that modified polypropylene fibers in the raw materials are obtained by the method in the preparation embodiment 5.
Example 6
A preparation method of a pavement base material, which is carried out according to the method in the embodiment 3, except that modified polypropylene fibers in the raw materials are obtained by the method in the preparation embodiment 6.
Example 7
A preparation method of a pavement base material, which is carried out according to the method in the embodiment 3, except that modified polypropylene fibers in the raw materials are obtained by the method in the embodiment 7.
Example 8
A preparation method of a pavement base material, which is carried out according to the method in the embodiment 3, except that modified polypropylene fibers in the raw materials are obtained by the method in the embodiment 8.
Comparative example
Comparative example 1
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and is characterized in that modified polypropylene fibers are not added in the raw materials.
Comparative example 2
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and the difference is that 30kg of modified polypropylene fiber and the like in the raw materials are replaced by 30kg of common polypropylene fiber.
Comparative example 3
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and the difference is that 588kg of steel slag and the like in the raw materials are replaced by 588kg of river sand.
Comparative example 4
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and is characterized in that 588kg of steel slag and other weight in raw materials are replaced by 588kg of broken stone.
Comparative example 5
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and is characterized in that the mass ratio of river sand, broken stone and steel slag in the raw materials is 1:2: 5; namely, the steps for preparing the solid mixture are as follows: 105kg of river sand, 210kg of crushed stone and 510kg of steel slag are mixed and stirred to obtain a solid mixture.
Comparative example 6
A preparation method of a pavement base material is carried out according to the method in the embodiment 3, and is characterized in that the mass ratio of river sand, broken stone and steel slag in the raw materials is 1:2: 9; namely, the steps for preparing the solid mixture are as follows: 70kg of river sand, 140kg of broken stone and 630kg of steel slag are mixed and stirred to obtain a solid mixture.
Performance test
The compressive strength and the flexural strength of the examples and comparative examples were measured according to "testing method for unconfined compressive strength of inorganic binder stabilizing material" and "testing method for indirect tensile strength of inorganic binder stabilizing material (cleavage test) (middle test piece is used as test piece)" in test regulation JTG E51-2009 of inorganic binder stabilizing material for road engineering, and the test results are shown in table 1.
Table 1:
as can be seen by combining example 3 with comparative examples 1 to 2 and by combining Table 1, comparative example 1 is different from example 3 in that no modified polypropylene fiber is added to the raw material of comparative example 1; the difference of comparative example 2 is that 30kg of the modified polypropylene fiber and the like in the raw material of comparative example 2 is replaced by 30kg of the unmodified ordinary polypropylene fiber; the data in table 1 for comparative example 3, comparative example 1 and comparative example 2 show that the compressive strength and the cleavage strength of the pavement base material in example 3 are much greater than those of comparative example 1 and comparative example 2. The reason why the pavement base material prepared from the modified polypropylene fibers in example 3 has better compressive strength and tensile strength and the addition of the modified polypropylene fibers can effectively improve the tensile strength of the pavement base material, thereby effectively improving the crack resistance of the pavement base material is that: the polypropylene fiber has the effect of improving the crack resistance of the pavement base material, and after the modified polypropylene fiber is obtained by rough surface modification of sodium acrylate and silicon dioxide particles, carboxylate radicals and hydroxyl radicals are introduced to the surface of the modified polypropylene fiber, so that the hydrophilicity is enhanced, and the dispersibility of the modified polypropylene fiber in the cement-stabilized base material is improved. More importantly, the silicon dioxide particles are coated on the surface of the modified polypropylene fiber, so that the surface of the modified polypropylene fiber is uneven, the modified polypropylene fiber can be embedded with aggregate, the connection between cement and the aggregate is enhanced, the integrity of the pavement base material is further improved, and the crack resistance of the pavement base material is greatly improved; the surface of the modified polypropylene fiber is coated with silica particles, and the silica particles can block partial pores of the pavement base material, so that the possibility of water evaporation is reduced, and the possibility of cracking of the pavement base material caused by volume shrinkage due to water reduction is further reduced; thereby effectively improving the crack resistance of the pavement base material.
As can be seen by combining example 3, comparative examples 3 to 6 and Table 1, comparative example 3 is different from example 3 in that 588kg of steel slag and the like in the raw material are replaced by 588kg of river sand; the difference of the comparative example 4 is that 588kg of the crushed stone is replaced by 588kg of the steel slag and the like in the raw materials; the difference of the comparative example 5 is that the mass ratio of the river sand, the broken stone and the steel slag in the raw materials is 1:2: 5; the difference of the comparative example 6 is that the mass ratio of the river sand, the crushed stone and the steel slag in the raw materials is 1:2: 9. Comparing the data in table 1 for example 3 and comparative examples 3-6, the compressive strength and the flexural strength of the pavement base material of example 3 are much better than the compressive strength and the splitting strength of the pavement base material of comparative examples 3-6. Description example 3 steel slag was used instead of part of river sand and crushed stone, and river sand: crushing stone: the mass ratio of the steel slag is 1:2: and 7, the prepared pavement base material has better compressive strength and tensile strength, so that the crack resistance of the pavement base material is greatly improved. The reason for this is that: the outer peripheral surface of the steel slag is rough and has a plurality of edges, the steel slag and the steel slag can be mutually embedded in a matching way, so that the connection between aggregate particles is enhanced, the integrity of the pavement base material is improved, the generation of cracks caused by the separation of components of the pavement base material is reduced, and the anti-cracking performance of the pavement base material is improved. And the steel slag and the broken stones are matched with the river sand with smooth and round surfaces, so that the mixing resistance of the aggregate and the cement can be properly reduced, the aggregate and the cement can be fully mixed, the integrity of the pavement base material is improved, and the crack resistance of the pavement base material is improved.
As can be seen by combining the data in table 1 of example 3 and example 6, the compressive strength and tensile strength of the roadbed material in example 6 are significantly higher than those in example 3, and the difference between the compressive strength and tensile strength is that the modified polypropylene fiber in the raw material of example 6 is further added with graphene oxide during the preparation, which illustrates that the crack resistance of the roadbed material in example 6 is better than that in example 3 because: the graphene oxide can introduce carboxyl and hydroxyl into the modified polypropylene fiber, so that the hydrophilicity of the modified polypropylene fiber is further improved, and the honeycomb special structure of the graphene oxide can effectively improve the tensile strength of the modified polypropylene fiber, so that the crack resistance of the pavement base material is enhanced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The pavement base material is characterized by being prepared from the following raw materials in percentage by weight:
5-7% of cement, 3-3.5% of modified polypropylene fiber, 6-8% of water and the balance of aggregate;
the aggregate comprises river sand, broken stone and steel slag, and the aggregate comprises the following components: crushing stone: the mass ratio of the steel slag is 1: (1.5-2.5): (6-8);
the modified polypropylene fiber is obtained by modifying the surface roughness of sodium acrylate and silicon dioxide particles of polypropylene fiber.
2. The pavement base material according to claim 1, wherein: the modified polypropylene fiber is obtained by modifying the following raw materials in parts by weight:
200 portions of sodium acrylate 180-.
3. The pavement base material according to claim 2, wherein: the raw material of the modified polypropylene fiber also comprises 80-100 parts by weight of graphene oxide.
4. The pavement base material according to claim 2, wherein: the modified polypropylene fiber is prepared by the method comprising the following steps:
preparing modified silicon dioxide: adding silica particles into water with the weight percentage of 70-75 percent of the total weight of the water, stirring, heating to 70-80 ℃ to obtain suspension, adding sodium acrylate with the weight percentage of 30-35 percent of the total weight of the sodium acrylate into the suspension while stirring, heating to 90-95 ℃, continuously stirring for 1-1.5h, filtering and drying to obtain modified silica;
preparing modified polypropylene fiber: mixing and stirring polypropylene fiber, the rest of water, xylene and the rest of sodium acrylate, heating to 50-55 ℃, and swelling for 85-95min under the protection of nitrogen to obtain a basic mixed solution; and heating the basic mixed solution to 90-95 ℃, adding modified silicon dioxide and an initiator into the basic mixed solution while stirring, continuously stirring for 2-3h, cooling and filtering to obtain the modified polypropylene fiber.
5. The pavement base material according to claim 4, wherein: 80-100 parts by weight of graphene oxide is added in the step of preparing the modified polypropylene fiber; and heating the basic mixed solution to 90-95 ℃, adding graphene oxide, modified silicon dioxide and an initiator into the basic mixed solution while stirring, continuously stirring for 2-3h, cooling and filtering to obtain the modified polypropylene fiber.
6. The pavement base material according to claim 1, wherein: the crushed stone is 10-15mm crushed stone; the steel slag is 0.075mm-19mm continuous graded steel slag; the river sand is continuous graded river sand with the grain size of 0.075mm-5 mm.
7. The pavement base material according to claim 6, wherein: the river sand: crushing stone: the mass ratio of the steel slag is 1:2: 7.
8. the pavement base material according to claim 1, wherein: the cement is composite Portland P.C32.5 cement.
9. A method of producing a pavement base material according to any of claims 1 to 8, comprising the steps of:
preparation of a solid mixture: mixing and stirring river sand, broken stone and steel slag to obtain a solid mixture;
preparing a mixed solution: adding modified polypropylene fiber into water while stirring to obtain a mixed solution;
preparing a pavement base material: and adding the mixed solution and cement into the solid mixture and stirring to obtain the pavement base material.
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| CN111196702A (en) * | 2020-01-10 | 2020-05-26 | 长沙理工大学 | Polypropylene fiber modified cement stabilized macadam and preparation method thereof |
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| CN107558182A (en) * | 2017-10-11 | 2018-01-09 | 中建西部建设新疆有限公司 | A kind of modified polypropene composite fibre and preparation method thereof |
| CN110054460A (en) * | 2019-05-17 | 2019-07-26 | 湖南余阗建材有限公司 | A kind of high strength steel dreg concrete |
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