CN112225507A - Road base material and preparation method thereof - Google Patents
Road base material and preparation method thereof Download PDFInfo
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- CN112225507A CN112225507A CN202011124268.8A CN202011124268A CN112225507A CN 112225507 A CN112225507 A CN 112225507A CN 202011124268 A CN202011124268 A CN 202011124268A CN 112225507 A CN112225507 A CN 112225507A
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- steel slag
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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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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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- 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)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a road base course and discloses a road base course material and a preparation method thereof. The road base material comprises the following raw material components, by weight, 10 parts of broken stone fine aggregate is taken as a reference, the content of acidified steel slag is 20-30 parts, the content of silicon powder is 0.8-2.5 parts, the content of cement is 1.2-2.5 parts, and the content of water is 2-3.5 parts. The method for preparing the road base material comprises the following steps: mixing the acidified steel slag, the broken stone fine aggregate, the silicon powder, the cement and water to obtain a mixture, and vibrating and stirring the mixture. The road base material has the advantage of low expansion rate, and can realize the resource utilization of solid wastes.
Description
Technical Field
The invention relates to a road base layer, in particular to a road base layer material and a preparation method thereof.
Background
The steel slag is a byproduct generated in the steel-making process, the non-metallic solid state is the expression form of the steel slag, the mineral phase composition of the steel slag is similar to that of cement clinker, and the steel slag is a material with higher activity. Along with the rapid development of industrial science and technology, the output of waste steel slag is more and more, and the accumulation of a large amount of steel slag not only occupies huge land resource space, but also causes serious problems of ecological environment pollution and the like. The research on the aspect of secondary utilization of steel slag in China has been advanced to a certain extent, and the steel slag is applied to the fields of road construction, agricultural production and the like, so that the resource utilization of the steel slag can be effectively realized, and the exploitation of sand and stone can be reduced to reduce the water and soil loss of some mountainous regions.
Because the steel slag contains more free calcium oxide (f-CaO), when the f-CaO generates hydrate in the form of hydroxide when meeting water, the volume of the hydrate is obviously expanded, and when the steel slag is applied to a road base layer, the expansion performance of the steel slag can cause the road base layer to be easy to generate phenomena of subgrade sinking, pavement cracking, slurry turning and the like after operation. Therefore, the reduction of the expansion rate of the steel slag has very important significance for road infrastructure construction.
Disclosure of Invention
The invention aims to solve the problems of easy cracking, sinking and slurry turning of a road base layer caused by steel slag in the prior art, and provides a road base layer material and a preparation method thereof.
In order to achieve the above object, a first aspect of the present invention provides a material for a road bed, comprising the following raw materials, based on 10 parts by weight of crushed stone fine aggregate, 20 to 30 parts by weight of acidified steel slag, 0.8 to 2.5 parts by weight of silica fume, 1.2 to 2.5 parts by weight of cement, and 2 to 3.5 parts by weight of water.
Preferably, the acidified steel slag is prepared by mixing and soaking steel slag coarse aggregate and an acid solution, and then drying.
Preferably, the acidified steel slag contains a first acidified steel slag, a second acidified steel slag and a third acidified steel slag, wherein the particle size of the first acidified steel slag is 19-26.5mm, the particle size of the second acidified steel slag is 9.5-19mm, the particle size of the third acidified steel slag is 4.75-9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag and the third acidified steel slag is 1-1.2: 1-1.5: 1.
preferably, the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the particle size of the first crushed stone is 2.36-4.75mm, the particle size of the second crushed stone is 0.6-2.36mm, the particle size of the third crushed stone is 0.075-0.6mm, the particle size of the fourth crushed stone is less than 0.075mm, and the mass ratio of the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone is 3-4: 6-8: 5-7: 1.
in a second aspect, the present invention provides a method of preparing a roadbed material, comprising the steps of: mixing acidified steel slag, broken stone fine aggregate, silicon powder, cement and water to obtain a mixture, and vibrating and stirring the mixture; wherein, on the basis of 10 weight parts of crushed stone fine aggregate, the using amount of the acidified steel slag is 20 to 30 weight parts, the using amount of the silicon powder is 0.8 to 2.5 weight parts, the using amount of the cement is 1.2 to 2.5 weight parts, and the using amount of the water is 2 to 3.5 weight parts.
Preferably, the acidified steel slag is prepared by mixing and soaking steel slag coarse aggregate and an acid solution, and then drying;
preferably, the acid solution is an organic acid solution, and the concentration of the organic acid in the organic acid solution is 5-20% by volume; the soaking time is 2-4 h.
Preferably, the acidified steel slag contains a first acidified steel slag, a second acidified steel slag and a third acidified steel slag, wherein the particle size of the first acidified steel slag is 19-26.5mm, the particle size of the second acidified steel slag is 9.5-19mm, the particle size of the third acidified steel slag is 4.75-9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag and the third acidified steel slag is 1-1.2: 1-1.5: 1;
preferably, the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the particle size of the first crushed stone is 2.36-4.75mm, the particle size of the second crushed stone is 0.6-2.36mm, the particle size of the third crushed stone is 0.075-0.6mm, the particle size of the fourth crushed stone is less than 0.075mm, and the mass ratio of the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone is 3-4: 6-8: 5-7: 1.
preferably, the mixing of the acidified steel slag, crushed fine aggregate, silica powder, cement and water comprises: mixing and stirring the acidified steel slag, the broken stone fine aggregate and the water, and then carrying out blank filling to obtain a mixed blank material, and mixing the mixed blank material, the silicon powder and the cement to obtain the mixture.
Preferably, the material sealing process at least meets the following conditions: the temperature is 20-40 deg.C, and the time is 10-15 h.
Preferably, the process of the vibration stirring at least satisfies the following conditions: the vibration frequency is 20-30Hz, the amplitude is 0.8-1.2mm, the stirring speed is 50-60rpm, and the time is 35-45 s.
Through the technical scheme, the invention has the beneficial effects that:
the raw material components of the road base material provided by the invention contain acidified steel slag, broken stone fine aggregate, silicon powder, cement and water, and f-CaO in the steel slag coarse aggregate is hydrated to generate Ca (OH) through an acidification process2Calcium element in the f-CaO is ionized, so that the content of the f-CaO in the steel slag can be effectively reduced, and the expansion rate of the road base material is reduced; as the specific surface area of the silicon powder is far larger than that of the acidified steel slag particles, the C-S-H gel generated by the contact of the silicon powder and the acidified steel slag particles promotes the f-CaO in the acidified steel slag to be further hydrated, and meanwhile, the product of the f-CaO hydration reaction in the acidified steel slag and the active ingredient SiO in the silicon powder can be reacted2The volcanic ash reaction is carried out to generate hydrated calcium silicate, which not only can excite the latent hydraulicity of the acid steel slag, but also can promote the water reducing effect and the filling effect of the silica powder, thereby further reducing the expansion rate of the road base material.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the invention provides a road bed material comprising the following raw material components, by weight, 10 parts of crushed stone fine aggregate is taken as a reference, the content of acidified steel slag is 20-30 parts, the content of silica powder is 0.8-2.5 parts, the content of cement is 1.2-2.5 parts, and the content of water is 2-3.5 parts.
In the invention, the silicon powder is micro silicon powder and silicon ash, and the smoke escaping with the waste gas is collected and treated by a special collecting device in the process of smelting industrial silicon and ferrosilicon at high temperature by an industrial electric furnace. The acidified steel slag is steel slag particles with the particle size of more than 4.75mm after acidification, the broken stone fine aggregate is broken stone particles with the particle size of less than 4.75mm, and the acidified steel slag and the broken stone fine aggregate are obtained by screening treatment respectively. According to the road base material, the coarse and fine particles of the acidified steel slag and the broken stone fine aggregate are arranged more closely by utilizing the gelation effect of cement, and meanwhile, the broken stone fine particles and the cement particles can be fully filled between coarse frameworks formed by the acidified steel slag, so that the probability of large gaps of the road base material is greatly reduced.
According to the invention, the acidified steel slag is prepared by mixing and soaking the steel slag coarse aggregate and the acid solution, and then drying. The acid solution is preferably an organic acid solution, and exemplarily, the organic acid may be selected from one or more of acetic acid, propionic acid and formic acid, and the organic acid solution is generally an organic acid-water solution, and the concentration of the organic acid in the organic acid solution is 5 to 20 vol%; the soaking time is 2-4h, and the acidified steel slag is obtained by drying the soaked steel slag coarse aggregate in a drying mode or any other drying mode. The inventors have found that in this preferred embodiment, the f-CaO in the steel slag coarse aggregate can be hydrated in the soaking solutionReaction to form Ca (OH)2，Ca(OH)2Belongs to medium and strong alkali, which can be ionized into Ca in a soaking solution2+And OH－，OH－With H in the soaking solution+The neutralization reaction can promote the ionization of organic acid, thereby improving the ionization degree of calcium element in f-CaO, effectively reducing the content of f-CaO in the steel slag, and reducing the expansion rate of the road base material when the steel slag is used for preparing the road base material.
According to the invention, the acidified steel slag contains a first acidified steel slag, a second acidified steel slag and a third acidified steel slag, the particle size of the first acidified steel slag is 19-26.5mm, the particle size of the second acidified steel slag is 9.5-19mm, the particle size of the third acidified steel slag is 4.75-9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag and the third acidified steel slag is 1-1.2: 1-1.5: 1. the first acidified steel slag, the second acidified steel slag and the third acidified steel slag are respectively acidified steel slag coarse aggregates with different specifications, and the steel slag coarse aggregates are classified by screening after being acidified and then are mixed according to the mass ratio for later use. The inventors have found that in this preferred embodiment, the compactness of the arrangement between the raw material components of the road base material is more facilitated.
According to the invention, the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the particle size of the first crushed stone is 2.36-4.75mm, the particle size of the second crushed stone is 0.6-2.36mm, the particle size of the third crushed stone is 0.075-0.6mm, the particle size of the fourth crushed stone is less than 0.075mm, and the mass ratio of the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone is 3-4: 6-8: 5-7: 1. the first gravel, the second gravel, the third gravel and the fourth gravel are gravel fine aggregates with different specifications respectively, and the gravel is classified through screening treatment and then mixed for later use according to the mass ratio. The inventor finds that under the preferred embodiment, the penetration of the broken stone fine particles into the internal pores of the acidified steel slag is more facilitated, and the larger gaps of the road base material are avoided.
According to the invention, the cement may be a conventional type of cement, illustratively portland cement.
In a second aspect, the present invention provides a method of preparing a roadbed material, comprising the steps of: mixing acidified steel slag, broken stone fine aggregate, silicon powder, cement and water to obtain a mixture, and vibrating and stirring the mixture; wherein, on the basis of 10 weight parts of crushed stone fine aggregate, the using amount of the acidified steel slag is 20 to 30 weight parts, the using amount of the silicon powder is 0.8 to 2.5 weight parts, the using amount of the cement is 1.2 to 2.5 weight parts, and the using amount of the water is 2 to 3.5 weight parts.
In the invention, as the specific surface area of the silicon powder is far larger than that of the acidified steel slag particles, the C-S-H gel generated by the contact of the silicon powder and the acidified steel slag particles promotes the f-CaO in the acidified steel slag to be further hydrated, and meanwhile, the product of the f-CaO hydration reaction in the acidified steel slag and the active ingredient SiO in the silicon powder can be reacted2The volcanic ash reaction is carried out to generate hydrated calcium silicate, which not only can excite the latent hydraulicity of the acid steel slag, but also can promote the water reducing effect and the filling effect of the silica powder, thereby further reducing the expansion rate of the road base material. According to the method for preparing the road base material, the raw material components are mixed and subjected to vibration stirring treatment, so that cement particles can be uniformly dispersed, the phenomenon of cement agglomeration is avoided, the cement particles can be favorably permeated into inner micropores of the acidified steel slag, the integral compactness of the road base material is improved, and the f-CaO hydration reaction and the volcanic ash reaction efficiency of hydration products and silica powder can be improved.
According to the invention, the acidified steel slag is prepared by mixing and soaking the steel slag coarse aggregate and the acid solution, and then drying; preferably, the acid solution is an organic acid solution, and the concentration of the organic acid in the organic acid solution is 5-20% by volume; the soaking time is 2-4 h.
According to the invention, the acidified steel slag contains a first acidified steel slag, a second acidified steel slag and a third acidified steel slag, the particle size of the first acidified steel slag is 19-26.5mm, the particle size of the second acidified steel slag is 9.5-19mm, the particle size of the third acidified steel slag is 4.75-9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag and the third acidified steel slag is 1-1.2: 1-1.5: 1;
according to the invention, the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the particle size of the first crushed stone is 2.36-4.75mm, the particle size of the second crushed stone is 0.6-2.36mm, the particle size of the third crushed stone is 0.075-0.6mm, the particle size of the fourth crushed stone is less than 0.075mm, and the mass ratio of the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone is 3-4: 6-8: 5-7: 1.
according to the present invention, the process of mixing the acidified steel slag, the crushed stone fine aggregate, the silica powder, the cement and the water comprises: mixing and stirring the acidified steel slag, the broken stone fine aggregate and the water, and then carrying out blank filling to obtain a mixed blank material, and mixing the mixed blank material, the silicon powder and the cement to obtain the mixture. The inventors have found that in this preferred embodiment, water which is beneficial for the road base material is uniformly distributed in the other raw materials, thereby enhancing the compactness of the road base after being used for road construction.
In the present invention, the conditions for the stuffy materials are not particularly limited, and water may be uniformly dispersed in each raw material. The general material sealing conditions comprise temperature, time and the like, and preferably, the material sealing process at least meets the following conditions: the temperature is 20-40 deg.C, specifically 20 deg.C, 25 deg.C, 30 deg.C, 35 deg.C, 40 deg.C, or any value between the above two values; the time is 10-15h, specifically 10h, 11h, 12h, 13h, 14h, 15h, or any value between the two values.
According to the invention, the process of the vibratory stirring at least meets the following conditions: the vibration frequency is 20-30Hz, specifically 20Hz, 22Hz, 24Hz, 26Hz, 28Hz, 30Hz, or any value between the two values; the amplitude is 0.8-1.2mm, specifically 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, or any value therebetween; the stirring speed is 50-60rpm, specifically 50rpm, 52rpm, 54rpm, 56rpm, 58rpm, 60rpm, or any value between the two values; the time is 35-45s, and specifically, may be 35s, 37s, 39s, 41s, 43s, 45s, or any value between the two values. The inventor finds that under the preferred embodiment, the broken stone fine aggregate and the cement particles are favorably and fully filled in the pores of the acidified steel slag, so that the compactness of the road base material is better, and the reaction efficiency of hydration reaction and pozzolan reaction is more favorably improved.
According to the invention, the method also comprises the step of forming the material obtained by the vibration stirring, wherein the interval time between the forming and the vibration stirring is less than 1 h. The forming adopts compaction forming, and specifically, the forming operation is carried out within 1h after the vibration stirring is finished.
The present invention will be described in detail below by way of examples.
In the following examples, the expansion ratio was measured by the method of GB/T24175-2009 "Steel slag stability test method"; the steel slag coarse aggregate is from a Shenglong steel mill in the city of urban defense harbors in Guangxi province; the crushed stone fine aggregate is limestone crushed stone from a certain mining area in Weinan city, Shanxi province, and is subjected to screening treatment to obtain first crushed stone with the grain diameter of 2.36-4.75mm, second crushed stone with the grain diameter of 0.6-2.36mm, third crushed stone with the grain diameter of 0.075-0.6mm and fourth crushed stone with the grain diameter of less than 0.075 mm; the silicon powder is from New Material GmbH of Newrui Qi of Wuhan; the cement is commercially available portland cement.
In the following examples, room temperature means 25. + -. 5 ℃ unless otherwise specified.
Example 1
(1) Placing the steel slag coarse aggregate into an acetic acid solution with the volume fraction of 15% to be soaked for 3 hours, placing the steel slag coarse aggregate into a drying oven to be dried, and then carrying out screening treatment to obtain first acidified steel slag with the grain size of 19-26.5mm, second acidified steel slag with the grain size of 9.5-19mm and third acidified steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 2300g of the first acidified steel slag, 2900g of the second acidified steel slag, 2100g of the third acidified steel slag, 500g of the first crushed stone, 1050g of the second crushed stone, 1000g of the third crushed stone and 150g of the fourth crushed stone obtained in the step (1) with 738g of water, stirring, and then carrying out blank curing at room temperature for 12 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 480g of silica fume and 500g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 25Hz, the amplitude is 1mm, the stirring speed is 55rpm, and the time is 40s, and performing heavy compaction molding within 1h after the vibrating and stirring.
Example 2
(1) Putting the steel slag coarse aggregate into a propionic acid solution with the volume fraction of 5%, soaking for 4 hours, putting the steel slag coarse aggregate into a drying oven, drying, and then screening to obtain first acidified steel slag with the grain size of 19-26.5mm, second acidified steel slag with the grain size of 9.5-19mm and third acidified steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 974g of the first acidified steel slag, 1216g of the second acidified steel slag, 810g of the third acidified steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 350g of the third crushed stone and 50g of the fourth crushed stone obtained in the step (1) with 350g of water, stirring, and then carrying out blank curing at room temperature for 15 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 250g of silica fume and 250g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 30Hz, the amplitude is 1.2mm, the stirring speed is 60rpm, the time is 30s, and the mixture is formed by heavy compaction within 1h after the vibrating and stirring.
Example 3
(1) Placing the steel slag coarse aggregate into an acetic acid solution with the volume fraction of 20% to be soaked for 2 hours, placing the steel slag coarse aggregate into a drying oven to be dried, and then carrying out screening treatment to obtain first acidified steel slag with the grain size of 19-26.5mm, second acidified steel slag with the grain size of 9.5-19mm and third acidified steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 667g of the first acidified steel slag, 667g of the second acidified steel slag, 666g of the third acidified steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 333g of the third crushed stone and 67g of the fourth crushed stone obtained in the step (1) with 200g of water, stirring, and then carrying out blank curing at room temperature for 10 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 80g of silica fume and 120g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 20Hz, the amplitude is 0.8mm, the stirring speed is 50rpm, the time is 45s, and performing heavy compaction and molding within 1h after the vibrating and stirring.
Example 4
A road base material was produced in the same manner as in example 3, except that the vibrational frequency of the vibrational stirring in step (2) was 50Hz, the amplitude was 3mm, the stirring rotation speed was 50rpm, and the time was 30 s.
Example 5
A road base material was prepared by following the procedure of example 3 except that the material-stuffiness time in the step (1) was 6 hours.
Example 6
A road base material was prepared in accordance with the method of example 3, except that the first acidified steel slag was used in an amount of 1000g, the second acidified steel slag was used in an amount of 800g, and the third acidified steel slag was used in an amount of 200g in step (1).
Example 7
A road base material was prepared by the method of example 3 except that the amount of the first crushed stone was 250g, the amount of the second crushed stone was 250g, the amount of the third crushed stone was 250g, and the amount of the fourth crushed stone was 250g in step (1).
Comparative example 1
(1) Screening the steel slag coarse aggregate to obtain first steel slag with the grain size of 19-26.5mm, second steel slag with the grain size of 9.5-19mm and third steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 667g of the first steel slag, 667g of the second steel slag, 666g of the third steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 333g of the third crushed stone and 67g of the fourth crushed stone obtained in the step (1) with 200g of water, stirring, and then carrying out blank curing at room temperature for 10 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 80g of silica fume and 120g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 20Hz, the amplitude is 0.8mm, the stirring speed is 50rpm, the time is 45s, and performing heavy compaction and molding within 1h after the vibrating and stirring.
Comparative example 2
A road base material was prepared by the method of example 3, except that no silica fume was added in the step (2).
Comparative example 3
(1) Placing the steel slag coarse aggregate into an acetic acid solution with the volume fraction of 20% to be soaked for 2 hours, placing the steel slag coarse aggregate into a drying oven to be dried, and then carrying out screening treatment to obtain first acidified steel slag with the grain size of 19-26.5mm, second acidified steel slag with the grain size of 9.5-19mm and third acidified steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 667g of the first acidified steel slag, 667g of the second acidified steel slag, 666g of the third acidified steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 333g of the third crushed stone and 67g of the fourth crushed stone obtained in the step (1) with 200g of water, stirring, and then carrying out blank curing at room temperature for 10 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 80g of silica fume and 120g of portland cement, uniformly stirring, and then compacting and molding within 1 hour by heavy compaction.
Comparative example 4
(1) Placing the steel slag coarse aggregate into an acetic acid solution with the volume fraction of 20% to be soaked for 2 hours, placing the steel slag coarse aggregate into a drying oven to be dried, and then carrying out screening treatment to obtain first acidified steel slag with the grain size of 19-26.5mm, second acidified steel slag with the grain size of 9.5-19mm and third acidified steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 334g of the first acidified steel slag, 333g of the second acidified steel slag, 333g of the third acidified steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 333g of the third crushed stone and 67g of the fourth crushed stone obtained in the step (1) with 200g of water, stirring, and then carrying out blank curing at room temperature for 10 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 300g of silica fume and 100g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 20Hz, the amplitude is 0.8mm, the stirring speed is 50rpm, the time is 45s, and heavy compaction molding is carried out within 1h after the vibrating and stirring.
Comparative example 5
(1) Screening the steel slag coarse aggregate to obtain first steel slag with the grain size of 19-26.5mm, second steel slag with the grain size of 9.5-19mm and third steel slag with the grain size of 4.75-9.5 mm;
(2) mixing 667g of the first steel slag, 667g of the second steel slag, 666g of the third steel slag, 200g of the first crushed stone, 400g of the second crushed stone, 333g of the third crushed stone and 67g of the fourth crushed stone obtained in the step (1) with 200g of water, stirring, and then carrying out blank curing at room temperature for 10 hours to obtain a mixed blank material;
(3) and (3) mixing the mixed blank material obtained in the step (2) with 120g of portland cement to obtain a mixture, vibrating and stirring the mixture, wherein the vibration frequency of the vibrating and stirring is 20Hz, the amplitude is 0.8mm, the stirring speed is 50rpm, the time is 45s, and heavy compaction molding is carried out within 1h after the vibrating and stirring are finished.
Test example
2kg of the road base material prepared in the examples 1 to 7 and the comparative examples 1 to 5 are respectively molded to obtain test pieces, each test piece is placed in a plastic barrel, an equal amount of water (3000mL) is added, so that the test piece can be completely immersed in the water for 10 hours, the water immersion expansion rate of each test piece is measured every 1 hour in the immersion process, and the results are shown in the table 1.
Table 1 test pieces of examples 1 to 7 and comparative examples 1 to 5 have swelling rates in water (unit%)
| Numbering | 1h | 2h | 3h | 4h | 5h | 6h | 7h | 8h | 9h | 10h |
| Example 1 | 0.01 | 0.02 | 0.04 | 0.05 | 0.06 | 0.06 | 0.09 | 0.12 | 0.13 | 0.15 |
| Example 2 | 0.06 | 0.09 | 0.13 | 0.17 | 0.21 | 0.25 | 0.28 | 0.32 | 0.36 | 0.40 |
| Example 3 | 0.04 | 0.06 | 0.10 | 0.13 | 0.18 | 0.21 | 0.23 | 0.27 | 0.30 | 0.34 |
| Example 4 | 0.11 | 0.16 | 0.20 | 0.27 | 0.30 | 0.37 | 0.42 | 0.45 | 0.49 | 0.56 |
| Example 5 | 0.09 | 0.13 | 0.19 | 0.23 | 0.28 | 0.33 | 0.38 | 0.41 | 0.45 | 0.50 |
| Example 6 | 0.15 | 0.19 | 0.26 | 0.31 | 0.36 | 0.42 | 0.47 | 0.53 | 0.59 | 0.66 |
| Example 7 | 0.07 | 0.10 | 0.15 | 0.19 | 0.22 | 0.26 | 0.29 | 0.33 | 0.39 | 0.42 |
| Comparative example 1 | 0.35 | 0.47 | 0.63 | 0.81 | 0.98 | 1.16 | 1.33 | 1.51 | 1.73 | 1.89 |
| Comparative example 2 | 0.31 | 0.36 | 0.43 | 0.61 | 0.78 | 0.97 | 1.06 | 1.24 | 1.43 | 1.57 |
| Comparative example 3 | 0.28 | 0.32 | 0.39 | 0.45 | 0.52 | 0.65 | 0.83 | 0.98 | 1.13 | 1.24 |
| Comparative example 4 | 0.21 | 0.24 | 0.31 | 0.35 | 0.40 | 0.45 | 0.53 | 0.58 | 0.63 | 0.71 |
| Comparative example 5 | 0.65 | 0.96 | 1.24 | 1.60 | 1.95 | 2.19 | 2.53 | 2.71 | 2.90 | 3.09 |
As can be seen from the results in table 1, the road base materials prepared in examples 1 to 7 by using the raw material components and the preparation method of the present invention have significantly reduced water swelling rates and significantly reduced swelling rates of the road base materials, as compared to comparative examples 1 to 5. It can be known from the embodiment 3 and the comparative example 3 that the vibration stirring can not only uniformly disperse the cement particles, which is beneficial for the cement particles to penetrate into the inner micropores of the acidified steel slag, and improve the overall compactness of the road base material, but also improve the efficiency of f-CaO hydration reaction and the volcanic ash reaction of hydration products and silica powder, and further reduce the expansion rate of the road base material.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The road base material is characterized by comprising the following raw material components, by weight, 10 parts of broken stone fine aggregate is taken as a reference, the content of acidified steel slag is 20-30 parts, the content of silicon powder is 0.8-2.5 parts, the content of cement is 1.2-2.5 parts, and the content of water is 2-3.5 parts.
2. The road bed material of claim 1, wherein the acidified steel slag is prepared by mixing and soaking a steel slag coarse aggregate with an acid solution, and then drying the mixture.
3. The road base material of claim 1, wherein the acidified steel slag comprises a first acidified steel slag, a second acidified steel slag and a third acidified steel slag, the first acidified steel slag has a particle size of 19-26.5mm, the second acidified steel slag has a particle size of 9.5-19mm, the third acidified steel slag has a particle size of 4.75-9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag and the third acidified steel slag is 1-1.2: 1-1.5: 1.
4. the road base material according to claim 1, wherein the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the first crushed stone has a particle size of 2.36-4.75mm, the second crushed stone has a particle size of 0.6-2.36mm, the third crushed stone has a particle size of 0.075-0.6mm, the fourth crushed stone has a particle size of less than 0.075mm, and the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone are present in a mass ratio of 3-4: 6-8: 5-7: 1.
5. a method of making a roadbed material comprising the steps of: mixing acidified steel slag, broken stone fine aggregate, silicon powder, cement and water to obtain a mixture, and vibrating and stirring the mixture;
wherein, on the basis of 10 weight parts of crushed stone fine aggregate, the using amount of the acidified steel slag is 20 to 30 weight parts, the using amount of the silicon powder is 0.8 to 2.5 weight parts, the using amount of the cement is 1.2 to 2.5 weight parts, and the using amount of the water is 2 to 3.5 weight parts.
6. The method according to claim 5, wherein the acidified steel slag is prepared by mixing and soaking the steel slag coarse aggregate with an acid solution, and then drying;
preferably, the acid solution is an organic acid solution, and the concentration of the organic acid in the organic acid solution is 5-20% by volume; the soaking time is 2-4 h.
7. The method of claim 5, wherein the acidified steel slag comprises a first acidified steel slag, a second acidified steel slag, and a third acidified steel slag, wherein the first acidified steel slag has a particle size of 19 to 26.5mm, the second acidified steel slag has a particle size of 9.5 to 19mm, the third acidified steel slag has a particle size of 4.75 to 9.5mm, and the mass ratio of the first acidified steel slag, the second acidified steel slag, and the third acidified steel slag is 1 to 1.2: 1-1.5: 1;
preferably, the crushed stone fine aggregate contains a first crushed stone, a second crushed stone, a third crushed stone and a fourth crushed stone, the particle size of the first crushed stone is 2.36-4.75mm, the particle size of the second crushed stone is 0.6-2.36mm, the particle size of the third crushed stone is 0.075-0.6mm, the particle size of the fourth crushed stone is less than 0.075mm, and the mass ratio of the first crushed stone, the second crushed stone, the third crushed stone and the fourth crushed stone is 3-4: 6-8: 5-7: 1.
8. the method of claim 5, wherein the mixing of the acidified steel slag, crushed fine aggregate, silica powder, cement and water comprises: mixing and stirring the acidified steel slag, the broken stone fine aggregate and the water, and then carrying out blank filling to obtain a mixed blank material, and mixing the mixed blank material, the silicon powder and the cement to obtain the mixture.
9. The method according to claim 8, wherein the material smoldering process at least meets the following conditions: the temperature is 20-40 deg.C, and the time is 10-15 h.
10. The method according to any one of claims 5 to 9, wherein the process of vibratory agitation satisfies at least the following conditions: the vibration frequency is 20-30Hz, the amplitude is 0.8-1.2mm, the stirring speed is 50-60rpm, and the time is 35-45 s.
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| CN111187039A (en) * | 2020-01-08 | 2020-05-22 | 安徽工业大学 | Novel steel slag miscellaneous fill road base material and preparation method thereof |
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| JP2006045781A (en) * | 2004-07-30 | 2006-02-16 | Jfe Steel Kk | Base course material for road |
| CN111187039A (en) * | 2020-01-08 | 2020-05-22 | 安徽工业大学 | Novel steel slag miscellaneous fill road base material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116217146A (en) * | 2023-03-07 | 2023-06-06 | 青岛永函包装机械有限公司 | Environment-friendly concrete balancing weight and preparation method thereof |
| CN116217146B (en) * | 2023-03-07 | 2024-08-20 | 青岛永函包装机械有限公司 | Environment-friendly concrete balancing weight and preparation method thereof |
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