CN111499240A - Red mud fiber composite material, preparation method thereof and application thereof in modified asphalt - Google Patents

Red mud fiber composite material, preparation method thereof and application thereof in modified asphalt Download PDF

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Publication number
CN111499240A
CN111499240A CN202010181307.1A CN202010181307A CN111499240A CN 111499240 A CN111499240 A CN 111499240A CN 202010181307 A CN202010181307 A CN 202010181307A CN 111499240 A CN111499240 A CN 111499240A
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China
Prior art keywords
red mud
parts
fiber composite
asphalt
composite material
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CN202010181307.1A
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CN111499240B (en
Inventor
张吉哲
姚占勇
孙法合
梁明
蒋红光
王凯
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Shandong University
Shandong High Speed Group Co Ltd
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Qilu Transportation Development Group Co ltd
Shandong University
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • 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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • 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 invention belongs to the technical field of modified asphalt, and particularly relates to a red mud fiber composite material, a preparation method thereof and application thereof in modified asphalt. The invention provides a red mud fiber composite material, which is prepared by respectively drying production waste red mud, slaked lime, cement and white mud, mixing the dried materials in proportion, performing ball milling to obtain a powder mixture, and uniformly mixing the powder mixture with fibers. The red mud fiber composite material mainly comprises production waste, is applied to asphalt mixture, can effectively enhance the adhesiveness of aggregates in the asphalt mixture and improve the stability of asphalt, and the preparation method of the asphalt mixture comprises the following steps: the modified asphalt mixture obtained by the method has good thermal stability, obviously improved high-temperature rutting resistance, low-temperature cracking resistance and water stability, reduced diseases of the asphalt pavement in service period and reduced road maintenance cost.

Description

Red mud fiber composite material, preparation method thereof and application thereof in modified asphalt
Technical Field
The invention belongs to the technical field of road engineering materials and preparation, and particularly relates to a red mud fiber composite material, a preparation method of the red mud fiber composite material, a mixture obtained by applying the composite material to asphalt, and a preparation method of the mixture.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the continuous development of the economy of China, the highway construction of China also enters the rapid development period. In 2018, the highway mileage of China exceeds 13 kilometers, and the highway mileage reaches 400 kilometers. In actual engineering construction, the typical structure of the pavement of a high-grade highway is a semi-rigid base asphalt pavement, and the proportion of the consumption of the asphalt pavement reaches more than 85 percent. However, with the increase of the road traffic life or the large proportion of heavy-duty vehicles, various diseases such as ruts, cracks, pits and the like can occur on the asphalt pavement. The key to improving the service life of the asphalt pavement is to improve the pavement performance of the asphalt pavement.
The red mud is insoluble solid industrial waste discharged after alumina is extracted from bauxite by an alkaline process, is called red mud because the red mud is rich in iron oxide and is red or brown, and about 1.0 to 1.8 tons of red mud is generated for producing 1 ton of alumina. According to different production methods, red mud can be divided into sintering process red mud, Bayer process red mud and combination process red mud. The aluminum industry in China is in a rapid development stage from the last 90 th century, and the discharge amount of red mud is increasing while the yield of alumina is rapidly improved. Due to the enhancement of environmental awareness, the existing red mud is mainly discharged by damming and stockpiling, the management and stockpiling cost of each ton of red mud reaches 50-100 yuan, land resources are occupied, and the ecological environment can be influenced by the red mud wastes with strong alkalinity and high salinity. The existing research shows that the red mud has large specific surface area, thicker surface texture and more pores, so that a plurality of small spherical particles are adhered together, the adsorption capacity is strong, and the red mud has stronger hydrophobicity, thereby improving the pavement performance of the asphalt mixture. The asphalt belongs to non-renewable resources, and the red mud resources are adopted to add the asphalt, so that the cost of the asphalt can be effectively reduced, and the use strength of the pavement is improved.
The appearance of the road fiber can greatly improve the use quality of the asphalt pavement. The fiber asphalt mixture has good applicability to pavements with high design requirements on low-temperature crack resistance and high-temperature stability. The fiber has the technical advantages of good dispersibility, good thermal stability, sufficient asphalt holding capacity, high tensile strength, good bond strength and the like, and the fiber uniformly dispersed in the asphalt mixture can form a three-dimensional network structure, so that the high-temperature stability, the low-temperature crack resistance and the water stability of the asphalt mixture can be improved. Patent CN 103850164B provides a drainage road surface with long service life, which uses slaked lime, red mud and composite fiber to modify asphalt, and has good drainage effect.
Disclosure of Invention
Aiming at the research background, the invention provides a novel red mud and fiber composite modified asphalt composite material and a preparation method thereof based on the performance characteristics of the red mud and fiber doped modified material, and in addition, cement, white mud and other components are added.
Based on the technical effects, the invention provides the following technical scheme:
the first aspect of the invention provides a red mud fiber composite material, which comprises the following raw materials: red mud, fiber, slaked lime, cement and white mud.
Preferably, the raw materials and the parts by weight thereof are 60-80 parts of red mud, 5-10 parts of fiber, 1-10 parts of slaked lime, 1-10 parts of cement and 1-10 parts of white mud.
More preferably, the red mud accounts for 66-78 parts.
More preferably, the fiber is 6 to 8 parts.
Further preferably, the slaked lime is 3-7 parts.
More preferably, the cement is 4-8 parts.
More preferably, the white mud is 3-8 parts.
Preferably, the red mud is one or a mixture of two of sintering process red mud and Bayer process red mud.
Preferably, the fiber is one or more of basalt fiber, polyester fiber, carbon fiber and lignin fiber.
Preferably, the cement is portland cement.
In a second aspect of the present invention, there is provided a method for preparing the red mud fiber composite material of the first aspect, the method comprising the steps of: mixing the dried red mud, slaked lime, cement and white mud, ball-milling to obtain a powder mixture, and mixing with fibers to obtain the red mud fiber composite material.
Preferably, the preparation method comprises the following steps:
(1) respectively putting the red mud, slaked lime, cement and white mud into a crusher to be crushed for 10-40min, and then putting the crushed red mud into a drying oven at 100-110 ℃ to be dried for 2-3h to remove water;
(2) grinding the dried red mud, slaked lime, cement and white mud for 10-40min by using a ball mill, and grinding to the particle size required by the filler in technical Specification for Highway asphalt pavement construction (JTG F40-2004);
(3) the red mud, the slaked lime, the cement and the white mud after ball milling are fully stirred for 10-40min, and the fibers are added into the mixture and then continuously stirred for 10-40 min.
The third aspect of the invention provides an application of the red mud fiber composite material of the first aspect in preparing modified asphalt.
The fourth aspect of the invention provides a modified asphalt mixture, which comprises the following raw materials: coarse aggregate, fine aggregate, asphalt, red mud fiber composite material and filler.
Preferably, the raw materials and the parts by weight are as follows: 60-80 parts of coarse aggregate, 20-40 parts of fine aggregate, 2-6 parts of asphalt, 2-6 parts of red mud fiber composite material and 3-6 parts of filler.
More preferably, the coarse aggregate is 65-75 parts.
More preferably, the fine aggregate is 24-36 parts.
Further preferably, the asphalt and red mud fiber composite material or filler is 4-5 parts.
Preferably, the types of the coarse aggregate and the fine aggregate are limestone, basalt, granite or diabase. In asphalt mixtures, coarse aggregates referred to in the art are considered as crushed stones, crushed gravel, screened gravel and slag, etc. having a particle size of more than 2.36 mm; the fine aggregate refers to natural sand, artificial sand (including machine-made sand) and stone chips with the particle size of less than 2.36 mm.
Further preferably, the indexes of the coarse aggregate and the fine aggregate meet the basic requirements of technical Specification for construction of road asphalt pavements (JTGF40-2004) on the coarse aggregate.
Preferably, the asphalt is matrix asphalt or modified asphalt, and meets technical Specifications for road asphalt pavement construction (JTG F40-2004).
Preferably, the filler is limestone mineral powder.
Further preferably, the limestone mineral powder meets the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) on fillers.
In a fifth aspect of the present invention, the preparation method of the modified asphalt mixture in the fourth aspect comprises the following steps: respectively preheating the filler, the coarse aggregate, the fine aggregate and the red mud fiber composite material, and preheating and melting asphalt; and uniformly mixing the coarse aggregate and the fine aggregate, sequentially adding the preheated asphalt, the red mud fiber composite material and the filler, and uniformly stirring to obtain the modified asphalt mixture.
Preferably, the filler is preheated in an oven at the temperature of 160-180 ℃ for 2-3 h.
Preferably, the coarse aggregate or the fine aggregate is preheated in an oven at the temperature of 160-170 ℃ for 2-3 h.
Preferably, the red mud fiber composite material is preheated in an oven at 180 ℃ and 160 ℃ for 1-3 h.
Preferably, the asphalt is preheated in an oven at the temperature of 130-150 ℃ for 1-3h to be melted.
Preferably, the coarse aggregate and the fine aggregate are stirred for 30-90s in the environment of 160-170 ℃.
Preferably, the stirring time after the addition of the asphalt is 90 to 180 s.
Preferably, the stirring time after the red mud fiber composite material is added is 30-90 s.
Preferably, the stirring time after the filler is added is 90 to 180 s.
In a sixth aspect of the present invention, there is provided an application of the red mud fiber composite material or the modified asphalt mixture of the first aspect in road surface construction.
The beneficial effects of one or more technical schemes are as follows:
(1) the main component of the red mud fiber composite modified material is solid waste, which provides a way for utilizing the solid waste, changes waste into valuable, can treat a large amount of accumulated waste residues, achieves the aim of protecting the environment, and reduces the construction cost.
(2) The red mud and the fibers are used for composite modification, so that the adhesiveness among aggregates in the asphalt mixture is greatly enhanced, and the fibers can form a compact space network in the asphalt mixture and uniformly disperse and transmit force to the aggregates due to the high elastic modulus and the high tensile strength, so that the stability of the asphalt mixture is enhanced.
(3) The red mud fiber composite modified material is verified to be capable of remarkably improving the high-temperature rutting resistance, the low-temperature cracking resistance and the water stability of the asphalt mixture, reducing the diseases of the asphalt pavement in the service period and reducing the road maintenance cost.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, aiming at the defects in the prior art, the invention provides a red mud fiber composite material, a preparation method of the red mud fiber composite material, a mixture obtained by applying the composite material to asphalt and a preparation method of the mixture.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
In the following examples, red mud is from Shandong aluminum industries, and is an industrial polluting waste discharged during the extraction of alumina in the aluminum industry.
The white mud is from Yinxing paper mill in Shandong province, is solid waste generated in the causticizing stage of pulping and papermaking industry, mainly contains calcium carbonate and sodium carbonate, and contains a small amount of lignin fiber.
The cement is from Shandong Shunkian building materials company, the cement used in the following examples is portland cement, the main mineral composition of which is: tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite.
Example 1
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 60 parts of limestone coarse aggregate, 30 parts of limestone fine aggregate, 4 parts of No. 70 matrix asphalt, 4 parts of limestone mineral powder and 2 parts of red mud fiber composite modified material, wherein each technical index of each raw material meets the relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: 60 parts of red mud, 10 parts of fiber, 10 parts of slaked lime, 10 parts of cement and 10 parts of white mud, wherein the red mud is sintered red mud, and the fiber is basalt fiber.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, putting the red mud, slaked lime, cement and white mud which are produced by a sintering method into a crusher to be crushed for 20min, and then putting the crushed red mud, slaked lime, cement and white mud into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the ball-milled powder for 30min to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding basalt fibers and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing limestone coarse aggregate and limestone fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring the limestone aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 2
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 65 parts of granite coarse aggregate, 25 parts of granite fine aggregate, 5 parts of 70# matrix asphalt, 3 parts of limestone mineral powder and 2 parts of red mud fiber composite modified material, wherein all technical indexes of the raw materials meet relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: the cement-based red mud composite material comprises, by weight, 80 parts of red mud, 5 parts of fibers, 2 parts of slaked lime, 3 parts of cement and 10 parts of white mud, wherein the red mud is Bayer process red mud, and the fibers are carbon fibers.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, respectively putting Bayer process red mud, slaked lime, cement and white mud into a crusher to be crushed for 30min, and then putting the crushed material into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the ball-milled powder for 30min to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding basalt fibers and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing granite coarse aggregate and granite fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring the granite aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 3
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 70 parts of diabase coarse aggregate, 20 parts of diabase fine aggregate, 3 parts of 70# matrix asphalt, 3 parts of limestone mineral powder and 4 parts of red mud fiber composite modified material, wherein each technical index of each raw material meets the relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: 80 parts of red mud, 10 parts of fibers, 3 parts of slaked lime, 3 parts of cement and 4 parts of white mud, wherein the red mud is sintered red mud, and the fibers are polyester fibers.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, putting the red mud, slaked lime, cement and white mud which are produced by a sintering method into a crusher to be crushed for 30min, and then putting the crushed red mud, slaked lime, cement and white mud into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the ball-milled powder for 30min to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding polyester fiber and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing diabase coarse aggregate and diabase fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring diabase aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 4
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 70 parts of limestone coarse aggregate, 20 parts of limestone fine aggregate, 2 parts of No. 70 matrix asphalt, 2 parts of limestone mineral powder and 6 parts of red mud fiber composite modified material, wherein each technical index of each raw material meets the relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: the cement-based composite material comprises 65 parts of red mud, 5 parts of fibers, 10 parts of slaked lime, 10 parts of cement and 10 parts of white mud, wherein the red mud is sintered red mud, and the fibers are polyester fibers.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, putting the red mud, slaked lime, cement and white mud which are produced by a sintering method into a crusher to be crushed for 20min, and then putting the crushed red mud, slaked lime, cement and white mud into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the ball-milled powder for 30min to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding polyester fiber and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing limestone coarse aggregate and limestone fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring the limestone aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 5
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 70 parts of granite coarse aggregate, 20 parts of granite fine aggregate, 2 parts of No. 70 matrix asphalt, 2 parts of limestone mineral powder and 6 parts of red mud fiber composite modified material, wherein all technical indexes of the raw materials meet relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: 75 parts of red mud, 10 parts of fibers, 5 parts of slaked lime, 5 parts of cement and 5 parts of white mud, wherein the red mud is Bayer process red mud, and the fibers are carbon fibers.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, respectively putting Bayer process red mud, slaked lime, cement and white mud into a crusher to be crushed for 30min, and then putting the crushed material into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the ball-milled powder for 30min to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding basalt fibers and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing granite coarse aggregate and granite fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring the granite aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 6
The red mud fiber composite modified asphalt mixture comprises the following raw materials:
(1) raw materials of the asphalt mixture: the paint comprises the following components in parts by weight: 70 parts of diabase coarse aggregate, 20 parts of diabase fine aggregate, 3 parts of 70# matrix asphalt, 2 parts of limestone mineral powder and 6 parts of red mud fiber composite modified material, wherein each technical index of each raw material meets the relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004); type of asphalt mixture: and (3) AC-20.
(2) Red mud fiber composite modified material: the paint comprises the following components in parts by weight: the cement-based composite material comprises, by weight, 80 parts of red mud, 1 part of fiber, 10 parts of slaked lime, 5 parts of cement and 4 parts of white mud, wherein the red mud is sintered red mud, and the fiber is polyester fiber.
The preparation method of the red mud fiber composite modified material comprises the following steps:
(1) firstly, putting the red mud, slaked lime, cement and white mud which are produced by a sintering method into a crusher to be crushed for 30min, and then putting the crushed red mud, slaked lime, cement and white mud into a drying oven with the temperature of 105 ℃ to be dried for 2.5h to remove water;
(2) grinding the mixture for 30min by using ball-milling powder to reach the particle size required by filler in technical Specification for road asphalt pavement construction (JTGF 40-2004);
(3) stirring a certain amount of sintering process red mud, slaked lime, cement and white mud in a stirrer for 30min at the rotating speed of 350 r/min until the materials are fully mixed, then adding polyester fiber and stirring for 20min at the rotating speed of 350 r/min until the materials are uniformly stirred.
The preparation method of the red mud fiber composite modified asphalt mixture comprises the following steps:
(1) placing limestone mineral powder in an oven at 170 ℃ for preheating for 2h, placing diabase coarse aggregate and diabase fine aggregate in the oven at 170 ℃ for preheating for 2h, and placing the red mud fiber composite modified material in the oven at 170 ℃ for preheating for 2 h.
(2) And (3) putting the No. 70 matrix asphalt into a 135 ℃ oven to be preheated for 3 hours to completely melt.
(3) Pouring diabase aggregate into a stirring pot at 165 ℃ according to the proportion, and stirring for 90s at 165 ℃ until mixing.
(4) And (4) pouring the preheated 70# matrix asphalt into the mixing pot in the step (3) according to the mixture ratio, and stirring for 90s until the mixture is completely uniform.
(5) And (4) pouring the preheated red mud fiber composite modified material into the stirring pot in the step (4) according to the proportion, and stirring for 90s until the red mud fiber composite modified material is completely uniform.
(6) And (5) pouring the preheated limestone mineral powder into the mixing pot in the step (5) according to the proportion, and stirring for 90s until the mixture is completely uniform, thus obtaining the red mud fiber composite modified asphalt mixture.
Example 7
The limestone asphalt mixture comprises the following components in parts by weight: 65 parts of limestone coarse aggregate, 28 parts of limestone fine aggregate, 3 parts of No. 70 matrix road petroleum asphalt and 4 parts of limestone mineral powder, and the preparation method of the asphalt mixture is the same as that in example 1.
Example 8
The granite asphalt mixture comprises the following components in parts by weight: 65 parts of granite coarse aggregate, 28 parts of granite fine aggregate, 3 parts of No. 70 matrix road petroleum asphalt and 4 parts of limestone mineral powder, and the preparation method of the asphalt mixture is the same as that in example 1.
Example 9
1. The asphalt mixture with the physically modified red mud replacing mineral powder comprises the following components in parts by weight: 60 parts of limestone coarse aggregate, 30 parts of limestone fine aggregate, 4 parts of No. 70 matrix asphalt, 4 parts of limestone mineral powder, 4 parts of No. 70 matrix road petroleum asphalt and 5.5 parts of physically modified red mud, wherein each technical index meets the relevant requirements in technical Specification for road asphalt pavement construction (JTG F40-2004). Type of asphalt mixture: and (3) AC-20. The red mud used in the physically modified red mud is sintering red mud, and the modified materials are slaked lime, fly ash, cement, blast furnace slag, white mud and carbide slag, and the mass ratio of the materials is 1:2.5:1.5:3:4: 3. The physically modified red mud is a mixture of red mud and a modified material, and the mass ratio of the red mud to the modified material is 1: 0.5.
2. The preparation method of the asphalt mixture with the physically modified red mud replacing mineral powder comprises the following steps:
(1) the method comprises the steps of firstly, conventionally crushing Bayer process red mud, then drying the red mud in a 105 ℃ oven for 3 hours to remove moisture, crushing the red mud for 2 minutes by using a high-speed crusher, and grinding the crushed red mud to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004);
(2) pouring a certain amount of modified material into water, and stirring for 20 minutes by using a force-increasing stirrer at the rotating speed of 100-300 revolutions per minute to fully mix the modified material and the water, wherein the mass ratio of the modified material to the water is 0.4: 1;
(3) pouring a certain amount of the red mud obtained in the step (1) into the modified material aqueous solution, and stirring for 20 minutes by using a power-increasing stirrer at the rotating speed of 100-300 r/min to fully mix the red mud and the modified material, wherein the mass ratio of the red mud to the modified material is 1: 0.5;
(4) in order to remove the water in the mixed slurry, pouring the fully mixed modified red mud slurry into a suction filtration bottle, carrying out suction filtration for 3min, and after the suction filtration is finished, putting the filter paper and the filter residue into an oven with the temperature of 105 ℃ for drying for 3 h;
(5) and taking out the filter paper and the filter residue, taking the filter residue from the filter paper, crushing the filter residue for 3min by using a high-speed crusher, and grinding the filter residue to the particle size required by the filler in technical Specification for road asphalt pavement construction (JTG F40-2004), thereby obtaining the physically modified red mud.
(6) And (4) drying the physically modified red mud in the step (3) at 105 ℃ for 3h to remove water, and using the dried physically modified red mud as a substitute filler of the asphalt mixture.
(7) Preheating the coarse aggregate and the fine aggregate at the temperature of 160-180 ℃ for 1h to serve as the aggregates of the asphalt mixture for later use;
(8) placing the coarse aggregate and the fine aggregate in a certain proportion in an asphalt mixture mixing pot, and dry-mixing for 30s at the temperature of 160-180 ℃ to pre-mix the coarse aggregate and the fine aggregate.
(9) Heating road matrix asphalt at 135 ℃ for 1-2h, adding the road matrix asphalt in parts by weight into coarse and fine aggregates according to a mixing proportion, and stirring for 1-3min until the mixture is uniform;
(10) and (4) adding the filler preheated in the step (6) into the mixture prepared in the step (9), and stirring for 30 seconds until the mixture is uniform, so as to obtain the road asphalt mixture.
Performance testing
In order to evaluate the influence of the red mud fiber composite modified material on the performance of the asphalt mixture, the asphalt mixture which has the same gradation as the raw material and is not added with the modified material is prepared as a comparison sample. The asphalt mixture prepared in the above embodiment was evaluated for high-temperature rutting resistance, low-temperature crack resistance, and water stability with reference to the test procedure of road engineering asphalt and asphalt mixture test protocol (JTG E20-2011), and the specific evaluation indexes are shown in table 1.
TABLE 1
Example number 1 2 3 4 5 6 7 8 9
Freeze-thaw split strength ratio (%) 93.5 89.0 89.1 89.7 90.2 92.3 85.4 88.7 88.4
Rut depth (mm) 1.5 1.8 1.6 1.6 1.5 2.1 2.3 2.4 1.8
Marshall stability (KN) 12.5 14.7 11.2 10.8 9.9 10.2 9.6 6.5 9.9
Maximum bending strain (μ ε) 2395 2568 2658 2276 2345 2259 2215 2006 2159
Stability of immersion residue (%) 90.1 83.5 89.4 86.6 91.1 82.6 82.3 76.5 85.3
Dynamic modulus (MPa) 19541 18715 18456 17542 19642 21004 16457 15876 18043
From the above performance test results it can be seen that: (1) after the red mud fiber composite modified material is added, the freeze-thaw splitting strength ratio and the soaking residual stability of the asphalt mixture obtained by performing a freeze-thaw splitting test and a soaking Marshall test are obviously improved, which shows that the red mud fiber composite modified material prepared by the invention can effectively improve the water stability of the asphalt mixture. (2) After the red mud fiber composite modified material prepared by the invention is added, the maximum bending strain of the asphalt mixture obtained by a trabecular bending test of the asphalt mixture is obviously improved, which shows that the red mud fiber composite modified material prepared by the invention can effectively improve the low-temperature crack resistance of the asphalt mixture. (3) After the red mud fiber composite modified material prepared by the invention is added, the Marshall stability and the dynamic stability of the asphalt mixture obtained by carrying out the Marshall stability test and the Hamburg rutting test are obviously improved, which shows that the red mud fiber composite modified material prepared by the invention can effectively improve the high-temperature stability of the asphalt mixture. (4) After the red mud fiber composite modified material prepared by the invention is added, Simple Performance Tests (SPT) are carried out, so that the dynamic modulus of the asphalt mixture added with the modified material is greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The red mud fiber composite material is characterized by comprising the following raw materials: red mud, 5-10 parts of fiber, 1-10 parts of slaked lime, cement and white mud; preferably, the raw materials and the parts by weight thereof are 60-80 parts of red mud, 5-10 parts of fiber, 1-10 parts of slaked lime, 1-10 parts of cement and 1-10 parts of white mud.
2. The red mud fiber composite material of claim 1, wherein the red mud is 66-78 parts; or 6-8 parts of the fiber; or 3-7 parts of slaked lime; or 4-8 parts of cement; or 3-8 parts of white mud.
3. The red mud fiber composite material of claim 1, wherein the red mud is one or a mixture of two of sintering process red mud and bayer process red mud; or the fiber is one or more of basalt fiber, polyester fiber, carbon fiber and lignin fiber; or the cement is portland cement.
4. The method for preparing the red mud fiber composite material of any one of claims 1 to 3, which is characterized by comprising the following steps: mixing the dried red mud, slaked lime, cement and white mud, ball-milling to obtain a powder mixture, and mixing with fibers to obtain the red mud fiber composite material.
5. The preparation method of the red mud fiber composite material of claim 4, which is characterized by comprising the following steps:
(1) respectively putting the red mud, slaked lime, cement and white mud into a crusher to be crushed for 10-40min, and then putting the crushed red mud into a drying oven at 100-110 ℃ to be dried for 2-3h to remove water;
(2) grinding the dried red mud, slaked lime, cement and white mud by a ball mill for 10-40 min;
(3) the red mud, the slaked lime, the cement and the white mud after ball milling are fully stirred for 10-40min, and the fibers are added into the mixture and then continuously stirred for 10-40 min.
6. Use of the red mud fiber composite of any one of claims 1 to 3 for the preparation of modified asphalt.
7. The modified asphalt mixture is characterized by comprising the following raw materials: coarse aggregate, fine aggregate, asphalt, red mud fiber composite material and filler; preferably, the raw materials and the parts by weight are as follows: 60-80 parts of coarse aggregate, 20-40 parts of fine aggregate, 2-6 parts of asphalt, 2-6 parts of red mud fiber composite material and 3-6 parts of filler;
further preferably, the coarse aggregate accounts for 65-75 parts;
further preferably, the fine aggregate accounts for 24-36 parts;
further preferably, the asphalt and red mud fiber composite material or filler is 4-5 parts.
8. The modified bituminous mixture of claim 7, wherein said coarse and fine aggregates are of the type limestone, basalt, granite or diabase;
or the asphalt is base asphalt or modified asphalt; preferably, the filler is limestone mineral powder.
9. A method for preparing a modified asphalt mixture according to claim 7 or 8, wherein the method comprises the steps of: respectively preheating the filler, the coarse aggregate, the fine aggregate and the red mud fiber composite material, and preheating and melting asphalt; uniformly mixing the coarse aggregates and the fine aggregates, sequentially adding the preheated asphalt, the red mud fiber composite material and the filler, and uniformly stirring to obtain the modified asphalt mixture;
preferably, the filler is placed in an oven at the temperature of 160-180 ℃ for preheating for 2-3 h;
preferably, the coarse aggregate or the fine aggregate is preheated for 2-3h in an oven at the temperature of 160-170 ℃;
preferably, the red mud fiber composite material is preheated for 1-3h in an oven at the temperature of 160-180 ℃;
preferably, the asphalt is preheated in an oven at the temperature of 130-150 ℃ for 1-3h to be melted;
preferably, the coarse aggregate and the fine aggregate are stirred for 30-90s in the environment of 160-170 ℃;
preferably, the stirring time after the asphalt is added is 90-180 s;
preferably, the stirring time after the red mud fiber composite material is added is 30-90 s;
preferably, the stirring time after the filler is added is 90 to 180 s.
10. Use of the red mud fiber composite according to any one of claims 1 to 3 or the modified asphalt mixture according to any one of claims 1 to 8 for road surface construction.
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