CN111574128A - Formula of foamed asphalt cold-recycling mixture and preparation method of mixture - Google Patents

Formula of foamed asphalt cold-recycling mixture and preparation method of mixture Download PDF

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Publication number
CN111574128A
CN111574128A CN202010471360.5A CN202010471360A CN111574128A CN 111574128 A CN111574128 A CN 111574128A CN 202010471360 A CN202010471360 A CN 202010471360A CN 111574128 A CN111574128 A CN 111574128A
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parts
foamed asphalt
mixture
mineral aggregate
asphalt
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杜卿
柳军
孙宏亮
张宗鹏
贾斌
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Road and Bridge International Co Ltd
China Communications Road and Bridge North China Engineering Co Ltd
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Road and Bridge International Co Ltd
China Communications Road and Bridge North China Engineering Co Ltd
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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
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/36—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
    • C04B2111/40—Porous or lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The application discloses a foamed asphalt cold recycling mixture formula. The formula comprises the following components: 100 parts of mineral aggregate; 3.5-8.5 parts of water; 1.5 to 3.5 portions of foamed asphalt. The method solves the technical problem that the optimal state cannot be achieved in all aspects due to the fact that the amount of foamed asphalt, the water content and the mineral aggregate required by the mixture are not accurate enough.

Description

Formula of foamed asphalt cold-recycling mixture and preparation method of mixture
Technical Field
The application relates to the field of foamed asphalt cold regeneration, in particular to a formula of a foamed asphalt cold regeneration mixture and a preparation method of the mixture.
Background
The foam asphalt cold regeneration technology is widely applied to the maintenance and reconstruction and expansion projects of highways abroad, and the technology is mature.
The inventor finds that the amount of foamed asphalt, the water content and the mineral aggregate required for preparing the mixture in the cold recycling technology of foamed asphalt are not accurate enough, and all aspects are not optimal.
Aiming at the problem that the amount of foamed asphalt, the water content and the mineral aggregate required by the mixture in the related art are not accurate enough and cannot reach the optimal state in all aspects, no effective solution is provided at present.
Disclosure of Invention
The application mainly aims to provide a foamed asphalt cold recycling mixture formula and a mixture preparation method, so as to solve the problem that the amount of foamed asphalt, the water content and the mineral aggregate required by the mixture are not accurate enough, and all aspects of the mixture cannot reach the optimal state.
In order to achieve the above object, according to one aspect of the present application, there is provided a foamed asphalt cold mix formulation.
The foamed asphalt cold recycling mixture formula comprises the following components: 100 parts of mineral aggregate; 3.5-8.5 parts of water; 1.5 to 3.5 portions of foamed asphalt.
Further, the amount of water is 6.3 parts.
Further, the foamed asphalt is 2.7 parts.
Further, the foaming temperature of the foamed asphalt is 160 ℃.
Furthermore, the ratio of the water consumption for foaming of the foamed asphalt is 2.3%.
Further, 79.5 parts of milling material in the mineral aggregate.
Further, 19 parts of stone powder in the mineral aggregate.
Further, the cement content in the mineral aggregate is 1.5 parts.
In order to achieve the above object, according to another aspect of the present application, there is provided a mix preparation method.
The method for preparing the mixture comprises the following steps: preparing foamed asphalt; determining the parts of milling materials, stone powder and cement in the mineral aggregate; determining the parts of water and the maximum dry density by a heavy compaction test; determining the optimal foamed asphalt part number through a splitting test, and verifying through a Marshall test; and mixing the milling material, the stone powder, the cement, the water and the foamed asphalt according to the determined parts to prepare a mixture.
Further, preparing the foamed asphalt comprises: asphalt was tested at three foaming temperatures; according to the experimental result, the optimal foaming conditions are determined as follows: the foaming temperature is 160 ℃; the amount of water used for foaming was 2.3%.
In the embodiment of the application, 100 parts of mineral aggregate is determined through experiments by adopting a mode of determining the material quantity through experiments; 3.5-8.5 parts of water; 1.5-3.5 parts of foamed asphalt, and mixing the foamed asphalt and the foamed asphalt with each other to prepare a mixture; the method achieves the purpose of greatly improving the amount of foamed asphalt, the water content and the mineral aggregate required by preparing the mixture, thereby realizing the technical effect that all aspects of the mixture can reach the optimal state, and further solving the technical problem that all aspects cannot reach the optimal state due to the fact that the amount of foamed asphalt, the water content and the mineral aggregate required by the mixture are not accurate enough.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a graph of a batch compaction curve for a heavy compaction test according to an embodiment of the present application;
FIG. 2 is one of the cleavage strength plots of a cleavage experiment according to an embodiment of the present application;
FIG. 3 is a second graph of the cleaving strength of a cleaving experiment according to an embodiment of the present application;
fig. 4 is a third graph of the cleavage strength of the cleavage experiment according to the embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1:
a foamed asphalt cold recycling mixture formula, which comprises: 100 parts of mineral aggregate; 3.5-8.5 parts of water; 1.5 to 3.5 portions of foamed asphalt. The mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement. Mixing the above aggregates to prepare a mixture; in the embodiment, the ingredient type of the plant-mixed foamed asphalt cold-recycling mixture is medium-grain type, the asphalt mixture is graded and synthesized according to the grading range specified by the specification, and the final mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement; determining that the water accounts for 3.5-8.5 parts according to conventional experience; the foamed asphalt is 1.5-3.5 parts. The accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate required by the preparation of the mixture is improved, so that the technical effect that the mixture can achieve good performance in all aspects is realized.
Example 2:
a foamed asphalt cold recycling mixture formula, which comprises: 100 parts of mineral aggregate; 6.3 parts of water; 1.5 to 3.5 portions of foamed asphalt. The mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement. Mixing the above aggregates to prepare a mixture; in the embodiment, the ingredient type of the plant-mixed foamed asphalt cold-recycling mixture is medium-grain type, the asphalt mixture is graded and synthesized according to the grading range specified by the specification, and the final mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement; the water content was determined to be 6.3 parts by weight according to the heavy duty test, and the maximum dry density of 2.085g/cm was obtained in this water content3，(ii) a The performance of the mixture is improved. Foamed asphalt is determined to be 1.5 parts to 3.5 parts according to conventional experience. The accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate amount required by the preparation of the mixture is improved, and particularly the water content is improved, so that the technical effect that the mixture can achieve better performance in all aspects is realized.
Heavy compaction test:
the air-dried old asphalt pavement milling material, stone powder and cement are mixed according to a set proportion, 3 percent of foamed asphalt is added, the optimal water content and the maximum dry density are determined through a heavy compaction test, and the results are as follows:
Figure BDA0002513828110000051
then drawing a mixture compaction curve according to the experimental data, and specifically as shown in figure 1; referring to this curve, it can be determined that when the water fraction is 6.3 parts, the maximum dry density can be obtained, and thus, it is apparent that the determination of 6.3 parts as the optimum water content is effective in improving the properties of the finally prepared mix.
Example 3:
a foamed asphalt cold recycling mixture formula, which comprises: 100 parts of mineral aggregate; 3.5-8.5 parts of water; 2.7 parts of foamed asphalt. The mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement. Mixing the above aggregates to prepare a mixture; in the embodiment, the ingredient type of the plant-mixed foamed asphalt cold-recycling mixture is medium-grain type, the asphalt mixture is graded and synthesized according to the grading range specified by the specification, and the final mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement; the water is determined to be 3.5 parts to 8.5 parts as determined by routine experimentation. Determining the foamed asphalt to be 2.7 parts according to a splitting test, wherein the optimal dry splitting strength can be obtained according to the parts of the foamed asphalt; the performance of the mixture is improved. The accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate required by the preparation of the mixture, especially the amount of the foamed asphalt, is improved, so that the technical effect that the mixture can achieve better performance in all aspects is realized.
Splitting test:
adding five kinds of foamed asphalt with different use amounts respectively, mixing with the premixed mineral aggregate, preparing test pieces according to the method specified in technical Specification for road asphalt pavement regeneration (JTG F41-2008) at different use amounts of asphalt, curing, measuring dry and wet splitting strengths, and drawing curves. See table below:
amount of foamed asphalt (%) Dry splitting Strength (MPa) Wet splitting Strength (MPa) Dry-to-wet split Strength ratio (%)
1.5 0.60 0.47 77.9
2.0 0.69 0.56 80.5
2.5 0.81 0.68 84.0
3.0 0.79 0.66 82.9
3.5 0.71 0.57 80.9
Then drawing a dry splitting strength-foamed asphalt dosage curve according to the experimental data, wherein the curve is specifically shown in figure 2; by referring to the curve, when the part of the foamed asphalt is determined to be 2.7 parts, the maximum dry splitting strength can be obtained, and therefore, the 2.7 parts are determined to be the optimal foamed asphalt amount, so that the performance of the finally prepared mixture can be obviously and effectively improved.
Example 4:
a foamed asphalt cold recycling mixture formula, which comprises: 100 parts of mineral aggregate; 6.3 parts of water; 2.7 parts of foamed asphalt. The mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement. Mixing the above aggregates to prepare a mixture; in the embodiment, the ingredient type of the plant-mixed foamed asphalt cold-recycling mixture is medium-grain type, the asphalt mixture is graded and synthesized according to the grading range specified by the specification, and the final mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement; the water content was determined to be 6.3 parts by weight according to the heavy duty test, and the maximum dry density of 2.085g/g/cm was obtained in this water content3，(ii) a The performance of the mixture is improved. Determining the foamed asphalt to be 2.7 parts according to a splitting test, wherein the optimal dry splitting strength can be obtained according to the parts of the foamed asphalt; the performance of the mixture is improved. The accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate required by the preparation of the mixture is greatly improved, so that the technical effect that the mixture can reach the optimal state in all aspects is realized.
Heavy compaction test:
the air-dried old asphalt pavement milling material, stone powder and cement are mixed according to a set proportion, 3 percent of foamed asphalt is added, the optimal water content and the maximum dry density are determined through a heavy compaction test, and the results are as follows:
Figure BDA0002513828110000071
then drawing a mixture compaction curve according to the experimental data, and specifically as shown in figure 1; referring to this curve, it can be determined that when the water fraction is 6.3 parts, the maximum dry density can be obtained, and thus, it is apparent that the determination of 6.3 parts as the optimum water content is effective in improving the properties of the finally prepared mix.
Splitting test:
adding five kinds of foamed asphalt with different use amounts respectively, mixing with the premixed mineral aggregate, preparing test pieces according to the method specified in technical Specification for road asphalt pavement regeneration (JTG F41-2008) at different use amounts of asphalt, curing, measuring dry and wet splitting strengths, and drawing curves. See table below:
Figure BDA0002513828110000072
Figure BDA0002513828110000081
then drawing a dry splitting strength-foamed asphalt dosage curve according to the experimental data, wherein the curve is specifically shown in figure 2; comprehensively analyzing three technical indexes of dry and wet splitting strength and dry and wet splitting strength ratio by comparison, and determining the optimal foamed asphalt dosage of 2.7 parts; therefore, determining 2.7 parts as the optimum amount of foamed asphalt apparently effectively improves the properties of the finally prepared mixture.
The application also relates to a method for preparing a mixture, comprising:
preparing foamed asphalt;
preferably, preparing the foamed asphalt comprises:
asphalt was tested at three foaming temperatures;
according to the experimental result, the optimal foaming conditions are determined as follows: the foaming temperature is 160 ℃; the amount of water used for foaming was 2.3%.
Adopting Zhonghai 70# A-grade asphalt, and performing a foaming test on the asphalt at three foaming temperatures to finally determine the optimal foaming conditions as follows: the foaming temperature is 160 ℃; the amount of water used for foaming was 2.3%. The tests are shown in the following table:
Figure BDA0002513828110000082
Figure BDA0002513828110000091
determining the parts of milling materials, stone powder and cement in the mineral aggregate;
determining the parts of water and the maximum dry density by a heavy compaction test;
determining the optimal foamed asphalt part number through a splitting test, and verifying through a Marshall test;
and mixing the milling material, the stone powder, the cement, the water and the foamed asphalt according to the determined parts to prepare a mixture.
In the embodiment, the ingredient type of the plant-mixed foamed asphalt cold-recycling mixture is medium-grain type, the asphalt mixture is graded and synthesized according to the grading range specified by the specification, and the final mineral aggregate comprises 79.5 parts of milling material, 19 parts of stone powder and 1.5 parts of cement; the water content was determined to be 6.3 parts by weight according to the heavy duty test, and the maximum dry density of 2.085g/g/cm was obtained in this water content3，(ii) a The performance of the mixture is improved. Determining the foamed asphalt to be 2.7 parts according to a splitting test, wherein the optimal dry splitting strength can be obtained according to the parts of the foamed asphalt; the performance of the mixture is improved. Determining the optimal foam asphalt dosage according to a splitting test, carrying out Marshall test verification, and measuring each index:
Figure BDA0002513828110000092
through tests, the design scheme for finally determining the mix proportion of the foamed asphalt cold-recycling mixture is as follows:
Figure BDA0002513828110000093
the accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate required by the preparation of the mixture is greatly improved, so that the technical effect that the mixture can reach the optimal state in all aspects is realized.
From the above description, it can be seen that the following technical effects are achieved by the present application:
the method achieves the aim of greatly improving the accuracy of the amount of the foamed asphalt, the water content and the mineral aggregate required by the preparation of the mixture, thereby realizing the technical effect that all aspects of the mixture can reach the optimal state, and further solving the technical problem that all aspects cannot reach the optimal state due to the fact that the amount of the foamed asphalt, the water content and the mineral aggregate required by the mixture are not accurate enough.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The foamed asphalt cold recycling mixture formula is characterized by comprising the following components in parts by weight:
100 parts of mineral aggregate;
3.5-8.5 parts of water;
1.5 to 3.5 portions of foamed asphalt.
2. The foamed asphalt cold mix formulation according to claim 1, wherein said water is 6.3 parts.
3. The foamed asphalt cold mix formulation according to claim 1, wherein said foamed asphalt is 2.7 parts.
4. The foamed asphalt cold mix formulation according to claim 1, wherein said foamed asphalt has a foaming temperature of 160 degrees celsius.
5. The foamed asphalt cold mix formulation according to claim 1, wherein the foaming water consumption of said foamed asphalt is 2.3%.
6. The foamed asphalt cold mix formulation according to claim 1, wherein the amount of milled material in the mineral aggregate is 79.5 parts.
7. The formulation for a cold mix for recycling foamed asphalt according to claim 1, wherein the mineral aggregate contains 19 parts of stone powder.
8. The foamed asphalt cold mix formulation according to claim 1, wherein the cement is 1.5 parts in the mineral aggregate.
9. A method of preparing a mix, the method comprising:
preparing foamed asphalt;
determining the parts of milling materials, stone powder and cement in the mineral aggregate;
determining the parts of water and the maximum dry density by a heavy compaction test;
determining the optimal foamed asphalt part number through a splitting test, and verifying through a Marshall test;
and mixing the milling material, the stone powder, the cement, the water and the foamed asphalt according to the determined parts to prepare a mixture.
10. The mix preparation method of claim 1, wherein preparing foamed asphalt comprises:
asphalt was tested at three foaming temperatures;
according to the experimental result, the optimal foaming conditions are determined as follows: the foaming temperature is 160 ℃; the amount of water used for foaming was 2.3%.
CN202010471360.5A 2020-05-28 2020-05-28 Formula of foamed asphalt cold-recycling mixture and preparation method of mixture Pending CN111574128A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001282252A (en) * 2000-03-31 2001-10-12 Fujii Yoshi Tsusho Kk Sound absorbing material
CN105347746A (en) * 2015-12-03 2016-02-24 苏交科集团股份有限公司 Foamed asphalt cold-recycling lime-fly-ash crush stone mixture and preparation method thereof
CN107540274A (en) * 2017-09-06 2018-01-05 东南大学 The Cold Recycling Mixtures with Foamed Asphalt proportion design method of internal friction angle and cohesive strength
CN108484071A (en) * 2018-04-08 2018-09-04 长安大学 A kind of foamed asphalt cold in place recycling mixture and its grading method and application
CN108570907A (en) * 2018-04-04 2018-09-25 北京城建远东建设投资集团有限公司 The construction method of foamed asphalt cold in place recycling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001282252A (en) * 2000-03-31 2001-10-12 Fujii Yoshi Tsusho Kk Sound absorbing material
CN105347746A (en) * 2015-12-03 2016-02-24 苏交科集团股份有限公司 Foamed asphalt cold-recycling lime-fly-ash crush stone mixture and preparation method thereof
CN107540274A (en) * 2017-09-06 2018-01-05 东南大学 The Cold Recycling Mixtures with Foamed Asphalt proportion design method of internal friction angle and cohesive strength
CN108570907A (en) * 2018-04-04 2018-09-25 北京城建远东建设投资集团有限公司 The construction method of foamed asphalt cold in place recycling
CN108484071A (en) * 2018-04-08 2018-09-04 长安大学 A kind of foamed asphalt cold in place recycling mixture and its grading method and application

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Application publication date: 20200825