CN113248166A - Asphalt pavement milling material particle reinforced stabilizer, preparation method thereof and reinforced stabilization method - Google Patents
Asphalt pavement milling material particle reinforced stabilizer, preparation method thereof and reinforced stabilization method Download PDFInfo
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- CN113248166A CN113248166A CN202110672099.XA CN202110672099A CN113248166A CN 113248166 A CN113248166 A CN 113248166A CN 202110672099 A CN202110672099 A CN 202110672099A CN 113248166 A CN113248166 A CN 113248166A
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- component
- strength
- asphalt pavement
- stabilizer
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
- C04B20/1081—Mineral polymers, e.g. geopolymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a particle reinforced stabilizer for a milling material of an asphalt pavement, a preparation method and a reinforced stabilization method thereof, belonging to the field of road engineering. The reinforcing stabilizer is a liquid slurry material consisting of a strength improving component and a surface stabilizing component, and the strength improving component consists of exciting alkali, silicate solution and an anti-cracking agent; the surface stabilizing component consists of quicklime, fly ash and mineral powder. After the milling material is soaked in the reinforcing stabilizer, the strength and stability of the road milling material can be effectively improved, the use quality of the milling material is further improved, a vital role is provided for road green sustainable development and the like in future large environments, the production and the use are convenient and quick, and the reinforcing stabilizer is suitable for being popularized in road building materials and engineering application.
Description
Technical Field
The invention relates to the field of road engineering, and particularly provides a reinforcing stabilizer for milling material particles of an asphalt pavement, a preparation method and a reinforcing and stabilizing method thereof.
Background
With the continuous deepening of the green traffic concept, the sustainable development of resources is gradually carried out, the road engineering construction is also improved, particularly, the problem that the milling and planing material for the old and old asphalt pavement is difficult to utilize is solved, the recycled.
As a road building material mainly pushed by the industry in recent years, the continuous application of the asphalt pavement milling material promotes the continuous upgrading of the road industry, and compared with the traditional matrix asphalt and the like, some high-performance modified asphalt can better realize the wrapping and combination of the recycled aggregate and improve the overall road performance of the mixture. However, the performance of the stone material of the original reclaimed material is not better than that of the existing newly mined aggregate, especially the strength of stone material, due to the repeated rolling for many years and the influence of other natural environments, and in addition, the existing asphalt pavement milling method cannot fully break or separate all the aggregates adhered by asphalt through analysis from the construction process, and part of stone material groups adhered together are used as the aggregate with large particle size, and the adhesion strength is far better than the strength of the stone material along with the aging of the asphalt. In addition, limited by the conditions of construction machinery, the stone material is easy to loosen after being milled, and part of aggregate is easy to crack by machinery during milling, which is also a main factor for reducing the overall strength of the aggregate.
Disclosure of Invention
The invention provides an asphalt pavement milling material particle reinforcing stabilizer which can improve the integral strength of a milling material and enlarge the application range thereof, aiming at the problems of insufficient strength and loose surface of the existing asphalt pavement milling material particles and difficult direct utilization.
The technical scheme adopted by the invention for solving the technical problems is as follows: the asphalt pavement milling material particle reinforcing stabilizer is characterized by being a liquid slurry material consisting of a strength improving component and a surface stabilizing component, wherein the strength improving component consists of an exciting alkali, a silicate solution and an anti-cracking agent; the surface stabilizing component consists of quicklime, fly ash and mineral powder.
Preferably, the mass ratio of the strength-enhancing component to the surface-stabilizing component is (30-50): 50-70), and particularly preferably (35-45): 55-65.
Preferably, the mass ratio of the excited alkali to the silicate solution to the anti-cracking agent in the strength improving component is (30-50): 35-55): 5-30, and particularly preferably (35-45): 40-50): 5-25.
The exciting base is preferably an aqueous solution of sodium hydroxide (concentration: 2.23mol/L) or an aqueous solution of potassium hydroxide (concentration: 1.5 mol/L).
The silicate solution is preferably water glass (liquid state, modulus is more than 2) and is used for forming a certain gel with the excited alkali, so that the overall strength is improved.
The anti-cracking agent is preferably a cement anti-cracking agent, and can effectively reduce the generation of cracks in the inorganic cementing material and prevent the strength reduction caused by the generation of cracks by being matched with other materials.
Preferably, the mass ratio of the quick lime, the fly ash and the mineral powder in the surface stabilizing component is (40-80): 10-30), and particularly preferably (50-70): 15-25.
The quick lime and the fly ash are common two-ash materials, can generate inorganic gel products through hydration reaction, and can play a role in increasing the surface strength of the aggregate by wrapping the inorganic gel products on the surface of the aggregate, and the addition of the mineral powder can better play a role in combining and reacting with various substances in the strength improving component, so that the anti-stripping capability of the aggregate is increased, the overall strength and the improving effect of the reinforcing stabilizer are improved, and the gel products are prevented from stripping in the long-term use process of the pavement to influence the recording effect and the service life of the pavement.
The invention further aims to provide a preparation method of the asphalt pavement milling material particle reinforced stabilizer.
The preparation of the asphalt pavement milling material particle reinforced stabilizer can be obtained by fully and uniformly mixing the excited alkali, the silicate solution, the anti-cracking agent, the quicklime, the fly ash and the mineral powder, but the preferable preparation method comprises the following steps:
preparation of the strength-enhancing component:
blending and stirring the excited alkali and the water glass according to a certain proportion, gradually adding the anti-cracking agent into the mixed solution according to the proportion in the stirring process, and stirring for 15-60 seconds after the addition is finished to finish the preparation of the strength improving component;
preparation of surface stabilizing component:
mixing the quicklime, the fly ash and the mineral powder in proportion, and stirring until the mixture is uniformly mixed to complete the preparation of the surface stabilizing component;
preparation of liquid slurry material:
and fully mixing and stirring the strength improving component and the surface stabilizing component to obtain the liquid slurry-shaped reinforcing stabilizer.
The invention also provides a method for reinforcing and stabilizing the milling material particles of the asphalt pavement, which is characterized in that the milling material particles are immersed into the reinforcing and stabilizing material, taken out after being immersed for a certain time, laid flat and kept stand until the surface is dry and hard.
Preferably, the mass ratio of the milling material particles to the reinforcing stabilizer is (70-85): 15-30, and particularly preferably (70-80): 20-30.
The soaking time is preferably 5-10 min.
Compared with the prior art, the preparation method and the strengthening and stabilizing method of the asphalt pavement milling material particle strengthening and stabilizing agent have the following outstanding beneficial effects:
the liquid slurry material disclosed by the invention takes a geopolymer as a main strength improving material, is combined with a plurality of inorganic stable materials, and is coated on the surface of a milled material, so that the strength of the milled material is improved and the surface is stable, the overall strength of the milled material can be greatly improved, and the liquid slurry material has good coating property, can prevent the surface of the milled material from loosening during use, and plays roles in stabilizing the surface, enhancing the integrity of the material, improving the strength of the milled material and the like.
After the integral strength of the milling material is improved, the application range of the milling material can be obviously enlarged, so that the road surface using the milling material has good bearing capacity, fatigue resistance and the like, and the milling material is better used in road construction.
And (III) the material can also be applied to enhancing the strength and stability of the waste cement concrete broken stone aggregate, wherein the geopolymer and the cement and the like belong to inorganic binders, and can be better fused with the surface of the cement concrete according to the specific properties of the material so as to meet higher material requirements and improve the engineering quality and quality.
Drawings
FIG. 1 is a photograph of a milled material sample before machining;
fig. 2 is a photograph of a wrapped milled material sample.
Detailed Description
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting.
[ examples 1 to 3 ]
Preparation of the strength-enhancing component:
the strength-improving component is formed by mixing an excited alkali, a silicate solution and an anti-cracking agent. The exciting alkali adopts sodium hydroxide aqueous solution (the concentration is 2.23 mol/L); the silicate solution has a density of 1.48g/cm3Water glass with a modulus of 2.36; the inorganic anti-cracking agent is a cement anti-cracking agent. The mass ratio of each component is defined as sodium hydroxide water solution: water glass: the cement crack resistance agent is 45:50: 5.
The sodium hydroxide aqueous solution and the water glass with the formula amount are blended according to a certain proportion, and a cement paste mixing pot is adopted for stirring. And in the stirring process, gradually adding the cement anti-cracking agent into the mixed solution in proportion, and stirring for 30 seconds after the addition is finished to finish the preparation of the strength improving component.
Preparation of surface stabilizing component:
the surface stabilizing component is formed by mixing mineral powder (solid), quicklime (solid) and fly ash (solid), wherein the mineral powder is mineral powder used for common road buildings, and the quicklime is secondary calcareous lime; the mass ratio of the mineral powder to the quicklime to the fly ash in each component is 40:30:30, 60:20:20 and 80:10: 10.
Preparing a milled material surface reinforcing stabilizer:
the reinforcing stabilizer is formed by fully mixing the strength improving component and the surface stabilizing component. The mass ratio of the strength-enhancing component to the surface-stabilizing component is 50:50, 40:60, 33: 67.
The milling material is a reclaimed material milled from an original road of a certain province, and is characterized in that the surface of the material is coated with a layer of thinner asphalt compared with general stone. After certain screening, milled materials with the grain diameter of 10-15mm are obtained as shown in figure 1. By referring to a crushing value test of coarse aggregate and a los Angeles abrasion test in JTG E42-2005 Highway engineering aggregate test regulation, the milled material is tested and detected to obtain the material with the crushing value of 25.4% and the abrasion value of 26.7%, which meets the requirements of the regulation.
The surface reinforcing and stabilizing method for the milling material particles of the asphalt pavement specifically comprises the following steps:
s1, completely soaking 10-15mm of milling materials to be used into the prepared surface reinforcing stabilizer for 8 min. Wherein the mass ratio of the milling material to the reinforcing stabilizer is 75: 25.
S2, fishing out the soaked milling and planing material (shown in figure 2), placing the milling and planing material in a shady and cool ventilating place at room temperature until the surface is finally solidified, and carrying out open-air curing for a period of time if the strength effect of direct use of the milling and planing material needs to be improved.
Aggregate test analysis was performed for examples 1 to 3, and the obtained test data are shown in table 1.
TABLE 1 test data of seven-day health preservation after preparation of surface strength stabilizers with different blending ratios
As shown in table 1, as the strength-enhancing component in the milled material surface reinforcing stabilizer is reduced, the surface stabilizing component is increased, and the numerical value of the crush value is gradually reduced, which indicates that the strength-enhancing component has a certain effect on enhancing the strength, and the loss value of the abrasion value is reduced first and then increased, and it can be clearly seen from the appearance of the sample in a large number of comparative tests that although the amount of the surface stabilizing component is gradually increased, the surface stabilizing component can well cover the milled material surface, when the amount of the surface stabilizing component is too much, the strength is also continuously increased, so that the surface of the milled material is easy to crack during the curing process, and the surface stabilizing component covered on the milled material surface is easier to fall off due to cracking. The mass ratio of the strength-enhancing component to the surface-stabilizing component is optimally 40: 60.
In examples 1 to 3, as the proportion of the mineral powder in the surface stabilizing component increases, the crushing value decreases gradually, and the abrasion value increases gradually, which indicates that the increase of the mineral powder proportion can effectively improve the strength of a part of milled materials, but the wrapping effect on the surface is inferior to the effect of quicklime and fly ash, resulting in an increase of the abrasion loss value, so that the effect is the best when the mass ratio of the mineral powder, the quicklime and the fly ash in the surface stabilizing component is 60:20:20, and the strength and the surface stability of the milled materials can be considered at the same time.
[ examples 4 to 7 ]
Preparation of the strength-enhancing component:
same as in example 1.
Preparation of surface stabilizing component:
the surface stabilizing component is formed by mixing mineral powder (solid), quicklime (solid) and fly ash (solid), wherein the mineral powder is mineral powder used for common road buildings, and the quicklime is secondary calcareous ash; the mass ratio of the mineral powder, the quicklime and the fly ash in the components is 60:20: 20.
Preparing a milled material surface reinforcing stabilizer:
the milling material surface reinforcing stabilizer consists of a strength improving component and a surface stabilizing component. The mass ratio of the strength-enhancing component to the surface-stabilizing component was 40: 60.
The milling stock was the same as in example 1.
The surface reinforcing and stabilizing method for the milling material particles of the asphalt pavement specifically comprises the following steps:
s1, completely soaking 10-15mm of milling materials to be used into a surface reinforcing stabilizer prepared in proportion for 8 min. Wherein the mass ratio of the milling material to the reinforcing stabilizer is 75: 25.
S2, fishing out the soaked milling and planing material, placing the milling and planing material in a cool and ventilated place at room temperature until the surface is finally solidified, and carrying out open-air curing for a period of time if the strength effect of direct use of the milling and planing material needs to be improved.
Aggregate test detection is carried out at different health-preserving ages under different blending ratios, and test data are collated to table 2.
TABLE 2 Experimental data at different ages
As shown in table 2, as the curing period gradually increases, the crushing value and the wear loss value of the milling material gradually decrease, which indicates that the strength and the surface stability of the milling material gradually increase, and also indicates that the curing period can be properly increased for use if the required construction period is longer in the actual construction process, and the effect is better.
[ examples 8 to 10 ]
Preparation of the strength-enhancing component:
the strength improver is formed by mixing an exciting alkali, a silicate solution and an anti-cracking agent. The exciting alkali adopts potassium hydroxide aqueous solution (2.23 mol/L); the silicate solution has a density of 1.48g/cm3Water glass with a modulus of 2.36; the inorganic anti-cracking agent is a cement anti-cracking agent. The mass ratio of each component is determined as potassium hydroxide water solution: water glass: a cement crack resistance agent.
The potassium hydroxide aqueous solution and the water glass with the formula amount are mixed according to a certain proportion, and a cement paste mixing pot is adopted for stirring. And in the stirring process, gradually adding the inorganic anti-cracking agent into the mixed solution according to a proportion, and stirring for 30 seconds after the inorganic anti-cracking agent is added to complete the preparation of the strength improving component.
Preparation of surface stabilizing component:
same as in example 1.
Preparing a milled material surface reinforcing stabilizer:
same as in example 1.
The milled material surface reinforcing stabilizer consists of a strength improving component and a surface stabilizing component, wherein the mass ratio of the strength improving component to the surface stabilizing component is 50:50, 40:60 and 33: 67.
The milling stock was the same as in example 1.
The surface reinforcing and stabilizing method of the asphalt pavement milling material particles is the same as that of the embodiment 1.
The test study was conducted by using an aqueous potassium hydroxide solution as an exciting base, and the test comparison was conducted by referring to the relevant test procedures and blending methods in examples 1 to 3, and the test detection data are shown in table 3.
TABLE 3 test data using potassium hydroxide as the activating base
As can be seen from table 3, the data of potassium hydroxide used as the activating base is slightly different from that of sodium hydroxide, but the data is the same from the general trend of strength and stability, so that different activating bases can be selected and used or the formula can be used according to the actual situation.
The present invention has been described in detail with reference to specific embodiments, which are intended to be illustrative only and not limiting. Insubstantial modifications of the invention, made by those skilled in the art based on the teachings of the invention, fall within the scope of the invention.
Claims (10)
1. The asphalt pavement milling material particle reinforced stabilizer is characterized in that: is a liquid slurry material consisting of a strength-enhancing component and a surface-stabilizing component,
the strength improving component consists of excited alkali, silicate solution and anti-cracking agent;
the surface stabilizing component consists of quicklime, fly ash and mineral powder.
2. The asphalt pavement milling material particle reinforcing stabilizer according to claim 1, characterized in that: the mass ratio of the strength-enhancing component to the surface-stabilizing component is (30-50) to (50-70).
3. The asphalt pavement milling stock particulate reinforcing stabilizer according to claim 1 or 2, characterized in that: the mass ratio of the excited alkali to the silicate solution to the anti-cracking agent in the strength improving component is (30-50): (35-55): 5-30).
4. The asphalt pavement milling material particle reinforcing stabilizer according to claim 3, characterized in that:
the exciting alkali is sodium hydroxide aqueous solution or potassium hydroxide aqueous solution;
the silicate solution is water glass;
the anti-cracking agent is a cement anti-cracking agent.
5. The asphalt pavement milling stock particulate reinforcing stabilizer according to claim 1 or 3, characterized in that:
the mass ratio of the quick lime, the fly ash and the mineral powder in the surface stabilizing component is (40-80): 10-30).
6. The preparation method of the asphalt pavement milling material particle reinforced stabilizer is characterized by comprising the following steps:
preparation of the strength-enhancing component:
blending and stirring the excited alkali and the water glass according to a certain proportion, gradually adding the anti-cracking agent into the mixed solution according to the proportion in the stirring process, and stirring for 15-60 seconds after the addition is finished to finish the preparation of the strength improving component;
surface stabilizing component:
mixing the quicklime, the fly ash and the mineral powder in proportion, and stirring until the mixture is uniformly mixed to complete the preparation of the surface stabilizing component;
liquid slurry material:
and fully mixing and stirring the strength improving component and the surface stabilizing component to obtain the liquid slurry-shaped reinforcing stabilizer.
7. The preparation method of the asphalt pavement milling material particle reinforcing stabilizer according to claim 6, characterized in that:
the mass ratio of the excited alkali to the silicate solution to the anti-cracking agent in the strength improving component is (35-45): (40-50): 5-25);
the mass ratio of the mineral powder, the quicklime and the fly ash in the surface stabilizing component is (40-80): 10-30);
the mass ratio of the strength-enhancing component to the surface-stabilizing component is (30-50) to (50-70).
8. The asphalt pavement milling material particle reinforcing and stabilizing method is characterized by comprising the following steps of: immersing milled material particles into the reinforced stabilizer of any one of claims 1-5, taking out after soaking for a certain time, laying flat and standing until the surface is dry and hard.
9. The asphalt pavement milling stock particle reinforcing and stabilizing method as claimed in claim 8, wherein: the mass ratio of the milling material particles to the reinforcing stabilizer is (70-85) to (15-30).
10. The asphalt pavement milling stock particle reinforcing and stabilizing method as claimed in claim 8, wherein: the soaking time is 5-10 min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114772981A (en) * | 2022-04-29 | 2022-07-22 | 重庆鑫科新型建筑材料有限责任公司 | Regenerated asphalt concrete and preparation process thereof |
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