CN113176177B - Optimized method for emulsified asphalt for cold-mix asphalt mixture based on rheological property - Google Patents
Optimized method for emulsified asphalt for cold-mix asphalt mixture based on rheological property Download PDFInfo
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Abstract
The invention discloses an emulsified asphalt optimizing method for cold-mix asphalt mixture based on rheological property, which comprises the steps of setting a vacuum vibration device and constructing an evaluation index function to obtain an evaluation index for evaluating interaction between different types of emulsified asphalt and mineral powder based on rheological property, comparing the relation curve strength of the evaluation index and temperature to obtain an optimal combination mode of the emulsified asphalt and mineral powder, and optimizing the emulsified asphalt with which the mineral powder is optimally matched by using a small amount of mineral powder aggregate, thereby realizing the rapid optimization of the combination mode of mineral powder and emulsified asphalt.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a method for optimizing emulsified asphalt for cold-mix asphalt mixture based on rheological property.
Background
The existing emulsified asphalt type cold-mixed asphalt mixture is used as a normal-temperature construction technology, has the advantages of energy conservation, environmental protection, convenient construction and the like, and is widely paid attention to by people. The synthesis of emulsified asphalt involves complex chemistry and is a thermodynamically unstable system. Aggregate is an important raw material and even stone of the same type, the chemical composition and apparent properties of the aggregate vary greatly from one place to another. The adhesion between emulsified asphalt and aggregate involves complex chemical and physical interactions, and in actual engineering, if the two are incompatible, the problems of poor workability of the mixture and poor adhesion between the mixture and aggregate can be caused, and the construction and road performance of the mixture are seriously affected.
There are limitations in the use of cold mix materials at present, one of the important reasons being that the corresponding emulsifiers or emulsified bitumen are not specifically developed in combination with the aggregate. An effective evaluation method for optimizing emulsified asphalt is also lacking. In addition, the emulsified asphalt residue is obtained with care, because too high an obtaining temperature may cause degradation of the modifier. In order to solve the problems, the invention adopts a low-temperature condition to obtain a sample of emulsified asphalt residues, and evaluates the interaction between different types of emulsified asphalt and mineral powder based on rheological properties. The invention can provide test method reference for designing emulsified asphalt or emulsifier according to aggregate properties.
Disclosure of Invention
The invention aims to provide an emulsified asphalt optimizing method for cold mix asphalt mixture based on rheological property, which is used for solving the problem that an effective evaluation method for optimizing emulsified asphalt is lacking in the prior art.
In order to solve the technical problems, the invention provides an emulsified asphalt optimization method for cold mix asphalt mixture based on rheological property, which comprises the following steps: selecting a plurality of engineering mineral materials and preprocessing to obtain a plurality of groups of mineral powder; selecting a plurality of emulsified asphalt, determining the blending amount of each group of mineral powder relative to each emulsified asphalt according to the blending time, and uniformly mixing the plurality of groups of mineral powder and the plurality of emulsified asphalt according to the proportion to obtain a plurality of groups of blending materials; rapidly introducing a plurality of groups of mixing materials into a vacuum vibration device, vibrating in vacuum and preserving health to obtain a plurality of groups of residues; carrying out dynamic shear rheological test on a plurality of groups of residues to obtain a plurality of groups of shear modulus, wherein the shear modulus comprises complex modulus of emulsified asphalt mastic and complex modulus of emulsified asphalt residues; establishing an evaluation index function of the interaction of the emulsified asphalt and mineral powder, and combining the blending amount and the shear modulus of a plurality of groups of mineral powder to obtain a plurality of groups of evaluation indexes; and drawing a plurality of relation curves related to the evaluation index and the temperature, determining an optimal relation curve according to the intensity of the evaluation index in the relation curve, and obtaining the optimal combination mode of the emulsified asphalt and the mineral powder.
Wherein the step of preprocessing comprises: and (3) cleaning, drying, cooling and grinding each engineering mineral aggregate in sequence, and sieving with a 0.075mm sieve to obtain mineral powder.
Preferably, the blendable time is greater than or equal to 200s.
Preferably, the vacuum vibration device comprises a base, a rotating platform, a rotating bracket, a rotating assembly, a vacuum mold suite and a vibration assembly; the rotating support is of a V-shaped structure, the vertex of the V-shape is rotatably connected with the base, and two sides of the V-shape opening are fixedly connected with the bottom surface of the rotating platform; the rotating assembly is arranged on the bottom surface of the rotating platform and close to the edge and is used for driving the rotating platform to swing; the vibration component is arranged in the middle of the bottom surface of the rotating platform and is used for vibrating the rotating platform along the vertical direction; the vacuum die suite is arranged on the top surface of the rotary platform, and a cavity for accommodating a plurality of groups of mixing materials is formed in the vacuum die suite.
Preferably, the rotating assembly comprises a first connecting rod, a second connecting rod and a rotating motor; one end of the first connecting rod is rotatably connected with the bottom surface of the rotating platform, which is close to the edge, the other end of the first connecting rod is rotatably connected with one end of the second connecting rod, which is far away from the first connecting rod, is fixedly connected with the rotating shaft of the rotating motor, and the shell of the rotating motor is fixedly arranged on the surface of the base.
Preferably, the vacuum die kit comprises a die plate, a vacuum cover and a vacuum exhaust pipe; the die plate is arranged in a vacuum cavity formed by surrounding the vacuum cover and the top surface of the rotating platform, the bottom surface of the die plate is connected with the top surface of the rotating platform, and the top surface of the die plate is provided with a plurality of sample grooves for accommodating the mixing materials; the vacuum exhaust pipe penetrates through the vacuum cover and is communicated with a vacuum cavity formed by surrounding the vacuum cover and the rotating platform.
Preferably, the conditions of health maintenance are: the health is carried out for 12 hours at 25 ℃ and then for 12 hours at 40 ℃.
Wherein the step of performing a dynamic shear rheology test on the plurality of sets of residues comprises: respectively carrying out stress scanning on each group of residues to determine the linear viscoelasticity range; based on the determined linear viscoelastic range, each set of residues is scanned separately for temperature and frequency to obtain corresponding shear modulus parameters.
Preferably, the expression of the evaluation index function is as follows:
Wherein K-B-G * represents an evaluation index concerning the interaction of emulsified asphalt and mineral powder, Is complex modulus of emulsified asphalt mastic,/>For the complex modulus of the emulsified bitumen residue, phi f represents the volume fraction of mineral powder incorporation.
The highest intensity of the evaluation indexes in the relation curves between the evaluation indexes and the temperature is an optimal relation curve, and the combination mode of the emulsified asphalt and mineral powder corresponding to the optimal relation curve is an optimal combination mode.
The beneficial effects of the invention are as follows: compared with the prior art, the invention provides an emulsified asphalt optimizing method for cold-mix asphalt mixture based on rheological property, which is characterized in that an evaluation index for evaluating interaction between different types of emulsified asphalt and mineral powder based on rheological property is obtained by setting a vacuum vibration device and constructing an evaluation index function, the strength of a relation curve of the evaluation index and temperature is compared, an optimal combination mode of the emulsified asphalt and mineral powder is obtained, a small amount of mineral powder aggregate is utilized to optimally select the emulsified asphalt which is optimally matched with the mineral powder, and the rapid optimization of the combination mode of mineral powder and emulsified asphalt is realized.
Drawings
FIG. 1 is a flow chart of one embodiment of a preferred method of emulsifying asphalt for a rheology based cold mix asphalt of the present invention;
FIG. 2 is a schematic diagram of a vacuum vibration device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the movement of an embodiment of a vacuum vibration apparatus according to the present invention;
FIG. 4 is a graph showing the relationship between the evaluation index and the temperature in example 1 of the present invention;
In the figure: the device comprises a base, a 2-rotating platform, a 3-rotating support, a 4-rotating assembly, a 41-first connecting rod, a 42-second connecting rod, a 43-rotating motor, a 5-vacuum die set, a 51-die plate, a 52-vacuum cover, a 53-vacuum exhaust pipe and a 6-vibrating assembly.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1, the preferred method for emulsifying asphalt for cold mix asphalt based on rheological properties in the present invention comprises the following steps.
S1: and selecting a plurality of engineering mineral materials and carrying out pretreatment to obtain a plurality of groups of mineral powder. In the step, a plurality of engineering mineral materials with certain quality are weighed according to the grade proportion and used as test aggregate, each engineering mineral material is sequentially cleaned, dried, cooled and ground, and the mineral powder is obtained after passing through a 0.075mm sieve; the drying temperature is preferably 100-110 ℃, and the drying treatment time is not less than 6 hours.
S2: and (3) selecting a plurality of emulsified asphalt, determining the blending amount of each group of mineral powder relative to each emulsified asphalt according to the blending time, and uniformly mixing the plurality of groups of mineral powder and the plurality of emulsified asphalt according to the proportion to obtain a plurality of groups of blending materials. In the step, the selected emulsified asphalt can be prepared by mixing common matrix asphalt with soap solution, or can be prepared by mixing modified matrix asphalt with soap solution, wherein the soap solution can contain emulsifying agent, acid solution, additives and the like; regarding the selection of the emulsified asphalt, the types of the emulsified asphalt can be preliminarily determined according to the interaction between the emulsified asphalt and the selected mineral powder, so that the combination range of various emulsified asphalt and various mineral powder can be preliminarily determined, and the accuracy of the subsequent selection of the optimal combination mode of the emulsified asphalt and the mineral powder can be improved; after the primary selection of the types of the emulsified asphalt is completed, determining the mixing amount of each group of mineral powder relative to each emulsified asphalt according to the mixing time, and uniformly mixing a plurality of groups of mineral powder with the corresponding emulsified asphalt according to the determined mixing amount to obtain a plurality of groups of mixing materials in a synchronous combination mode. Wherein the mixing time is more than or equal to 200s, and the mixing amount of mineral powder relative to emulsified asphalt is the volume percentage of the mineral powder before mixing.
S3: and (3) rapidly introducing a plurality of groups of mixing materials into a vacuum vibration device, vibrating in vacuum and preserving health to obtain a plurality of groups of residues. Referring to fig. 2 to 3, in this step, the vacuum vibration device includes a base 1, a rotating platform 2, a rotating bracket 3, a rotating assembly 4, a vacuum mold set 5 and a vibration assembly 6; the rotating bracket 3 is of a V-shaped structure, the vertex of the V-shape is rotatably connected with the base 3, and two sides of the V-shape opening are fixedly connected with the bottom surface of the rotating platform 2; the rotating component 4 is arranged on the bottom surface of the rotating platform 2 near the edge and is used for driving the rotating platform to swing; the vibration assembly 6 is arranged in the middle of the bottom surface of the rotary platform 2 and is used for vibrating the rotary platform 2 along the vertical direction, preferably an eccentric vibration motor is used as a rotation assembly, and the frequency of vibration is regulated and controlled by controlling the rotating speed of the eccentric vibration motor; the vacuum mould set 5 is arranged on the top surface of the rotary platform 2, and a cavity for containing a plurality of groups of mixing materials is formed in the vacuum mould set.
Specifically, the rotation assembly 4 includes a first connection rod 41, a second connection rod 42, and a rotation motor 43; one end of the first connecting rod 41 is rotatably connected with the bottom surface of the rotating platform 2 close to the edge, the other end of the first connecting rod 41 is rotatably connected with one end of the second connecting rod 42, one end of the second connecting rod 42 away from the first connecting rod 41 is fixedly connected with a rotating shaft of the rotating motor 43, and a shell of the rotating motor 43 is fixedly arranged on the surface of the base 1. The rotating assembly drives the second connecting rod through the rotating motor, and then drives the first connecting rod, so that the rotating platform and the vacuum die sleeve member do left-right swinging motion, specifically, the swinging speed can be controlled through the rotating speed of the rotating motor, the maximum rotation angle theta in the swinging process can be adjusted through controlling the lengths of the first connecting rod and the second connecting rod, and the maximum rotation angle theta can be adaptively adjusted according to actual requirements without limitation.
Specifically, the vacuum mold set 5 includes a mold plate 51, a vacuum cover 52, and a vacuum exhaust pipe 53; the mold plate 51 is arranged in a vacuum cavity formed by the vacuum cover 52 and the top surface of the rotating platform 2, the bottom surface of the mold plate 51 is connected with the top surface of the rotating platform 2, the material of the mold plate 51 can be preferably polytetrafluoroethylene or silica gel, the top surface of the mold plate 51 is provided with a plurality of sample grooves for accommodating mixing materials, the diameters of the sample grooves can be adaptively set according to the diameters of parallel plates of a dynamic rheometer in a dynamic shear rheological test, and the number of the sample grooves can be adaptively set according to actual requirements, so that the method is not limited; the vacuum exhaust pipe 53 penetrates through the vacuum cover 52 and is communicated with a vacuum cavity formed by the vacuum cover 52 and the rotating platform 2 in a surrounding mode, and the vacuum exhaust pipe is used for vacuumizing the cavity, so that the mixture in the cavity can keep a vacuum environment in the curing process.
The health-preserving conditions are preferably as follows: the health preserving is carried out for 12 hours at 25 ℃ and then for 12 hours at 40 ℃, so that compared with the existing health preserving conditions, the health preserving process time is shortened on the basis of meeting engineering test requirements. Through setting up above-mentioned vacuum vibration device to rationally control vibration frequency and swing frequency, make the mix can carry out the health preserving well under vacuum environment, effectively prevented that can produce the bubble in the residue after the health preserving and influence the problem of follow-up test result, and the residue that obtains can directly be used for follow-up dynamic shear rheological test, and need not to carry out secondary heating treatment, make the process more simple and direct.
S4: and carrying out dynamic shear rheological test on the residues to obtain shear moduli, wherein the shear moduli comprise complex modulus of emulsified asphalt mastic and complex modulus of emulsified asphalt residues. In the step, each group of residues is respectively subjected to stress scanning to determine the linear viscoelasticity range; based on the determined linear viscoelastic range, each set of residues is scanned separately for temperature and frequency to obtain corresponding shear modulus parameters. The dynamic shear rheological test adopts a test process known to those skilled in the art to obtain the corresponding shear modulus parameter, and the specific process is not described herein.
S5: and establishing an evaluation index function of the interaction of the emulsified asphalt and the mineral powder, and combining the blending amount and the shear modulus of a plurality of groups of mineral powder to obtain a plurality of groups of evaluation indexes. Specifically, the expression of the evaluation index function is as follows:
Wherein K-B-G * represents an evaluation index concerning the interaction of emulsified asphalt and mineral powder, Is complex modulus of emulsified asphalt mastic,/>For the complex modulus of the emulsified bitumen residue, phi f represents the volume percent of mineral powder incorporation.
S6: and drawing a plurality of relation curves related to the evaluation index and the temperature, determining an optimal relation curve according to the intensity of the evaluation index in the relation curve, and obtaining the optimal combination mode of the emulsified asphalt and the mineral powder. In the step, a relation curve between the evaluation index and the temperature is established, the intensity of the evaluation index in the relation curve is compared, the stronger the intensity of the evaluation index is, the stronger the interaction between the combination mode of the emulsified asphalt corresponding to the curve and mineral powder is, and the compatibility is better, so that the highest intensity of the evaluation index in the relation curve is the optimal relation curve, and the combination mode of the emulsified asphalt corresponding to the optimal relation curve and mineral powder is the optimal combination mode, and the optimal combination mode of the emulsified asphalt and mineral powder is obtained.
Further, the steps S1 to S6 can be repeatedly executed based on emulsified asphalt obtained under different formulas or processes and mineral powder aggregates with different physical and chemical properties according to different engineering project requirements, and the total test data can be gradually increased along with the accumulation of test times of different combination modes of the emulsified asphalt and the mineral powder, so that a training sample set is formed; based on the accumulated training sample set, deep learning is applied to build a model, so that the combination mode of emulsified asphalt and mineral powder is predicted, the test workload can be reduced, and the rapid optimization of the formula is realized. The acquisition of the training sample set and the construction of the deep learning model can be performed in a manner known to those skilled in the art, and thus will not be described in detail.
The procedure and effects of the preferred method for emulsifying asphalt for cold mix asphalt mixtures based on rheological properties described above will be described below with reference to specific examples.
Example 1
The specific preferred steps in this embodiment are as follows:
(1) And (3) weighing engineering mineral materials with certain mass according to the grade, namely respectively cleaning limestone, diabase and granite, drying in a baking oven at 105 ℃ for 6 hours, cooling, grinding, and sieving with a 0.075mm sieve to obtain mineral powder for later use.
(2) Testing basic physical properties and compound composition of mineral powder aggregates, and preliminarily selecting 2 cationic emulsified asphalt according to an interaction mechanism between the emulsified asphalt and mineral powder, wherein the cationic emulsified asphalt is respectively marked as 3# and 4#; based on the condition that the mixing time is more than or equal to 200s, the mixing amount of mineral powder relative to emulsified asphalt is determined, the specific volume percentage is 0.33, and then the mixture with different combinations is obtained after mechanical stirring and uniform mixing.
(3) The obtained mixture is rapidly injected into a sample groove of a mould plate of a vacuum vibration device, the mould plate is made of polytetrafluoroethylene material, the diameter of the sample groove is 25mm according to the diameter of a parallel plate of a dynamic shear rheometer, 4 groups of samples are prepared for each sample, and 3 parallel tests are carried out; placing a die plate containing a mixture sample on a rotating platform, setting vibration, left-right swing frequency and amplitude and proper vacuum degree, and then placing the die plate into an oven for curing under the curing condition of 25 ℃ for 12 hours to obtain a plurality of groups of residue samples.
(4) The residual sample was subjected to a dynamic shear rheological test, first to a stress sweep to determine the linear viscoelastic range, set to 3% in this example, and then to a temperature sweep test to obtain the shear modulus G *.
(5) And establishing an evaluation index function of the interaction of the emulsified asphalt and mineral powder, wherein the functional expression is shown as the foregoing, and combining the blending amount and the shear modulus data to obtain a plurality of groups of evaluation indexes K-B-G *.
(6) And drawing a plurality of relation curves related to the evaluation index and the temperature, as shown in fig. 4, determining an optimal relation curve according to the intensity of the evaluation index in the relation curve, and obtaining the optimal combination mode of the emulsified asphalt and the mineral powder. As can be seen from fig. 4, when the type of emulsified asphalt is used as a variable, the interaction between the 4# emulsified asphalt and the mineral powder is strongest compared with the interaction strength between the 3# emulsified asphalt and the mineral powder; the mineral powder type is used as a variable for analysis, and the interaction between the 4# mineral powder and the Huang Gangyan mineral powder is strongest, so that the 4# emulsified asphalt and granite can be optimized comprehensively to be the best combination, and the implementation case shows that the method provided by the invention can be used for optimizing and selecting the proper emulsified asphalt for different aggregates.
Compared with the prior art, the invention provides an emulsified asphalt optimizing method for cold-mix asphalt mixture based on rheological property, which is characterized in that an evaluation index for evaluating interaction between different types of emulsified asphalt and mineral powder based on rheological property is obtained by setting a vacuum vibration device and constructing an evaluation index function, the strength of a relation curve of the evaluation index and temperature is compared, an optimal combination mode of the emulsified asphalt and mineral powder is obtained, a small amount of mineral powder aggregate is utilized to optimally select the emulsified asphalt which is optimally matched with the mineral powder, and the rapid optimization of the combination mode of mineral powder and emulsified asphalt is realized.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. An emulsified asphalt optimizing method for cold mix asphalt mixture based on rheological property is characterized by comprising the following steps:
Selecting a plurality of engineering mineral materials and preprocessing to obtain a plurality of groups of mineral powder;
Selecting a plurality of emulsified asphalt, determining the mixing amount of each group of mineral powder relative to each emulsified asphalt according to the mixing time, and uniformly mixing the plurality of groups of mineral powder and the plurality of emulsified asphalt according to the proportion to obtain a plurality of groups of mixing materials;
Rapidly introducing a plurality of groups of mixing materials into a vacuum vibration device, vibrating in vacuum and preserving health to obtain a plurality of groups of residues;
Performing a dynamic shear rheology test on a plurality of groups of the residues to obtain a plurality of groups of shear moduli, wherein the shear moduli comprise complex moduli of emulsified asphalt mastic and complex moduli of emulsified asphalt residues;
establishing an evaluation index function of the interaction of the emulsified asphalt and mineral powder, and combining the mixing amount of a plurality of groups of mineral powder with the shear modulus to obtain a plurality of groups of evaluation indexes;
drawing a plurality of relation curves related to the evaluation index and the temperature, determining an optimal relation curve according to the intensity of the evaluation index in the relation curve, and obtaining the combination mode of the optimal emulsified asphalt and mineral powder;
The vacuum vibration device comprises a base, a rotating platform, a rotating bracket, a rotating assembly, a vacuum mold suite and a vibration assembly; the rotating support is of a V-shaped structure, the vertex of the V-shape is rotatably connected with the base, and two edges of the V-shape opening are fixedly connected with the bottom surface of the rotating platform; the rotating assembly is arranged on the bottom surface of the rotating platform and close to the edge and is used for driving the rotating platform to swing; the vibration component is arranged in the middle of the bottom surface of the rotating platform and is used for vibrating the rotating platform along the vertical direction; the vacuum die sleeve is arranged on the top surface of the rotating platform, and a plurality of groups of cavities for accommodating the mixing materials are formed in the vacuum die sleeve;
the rotating assembly comprises a first connecting rod, a second connecting rod and a rotating motor; one end of the first connecting rod is rotatably connected with the bottom surface of the rotating platform close to the edge, the other end of the first connecting rod is rotatably connected with one end of the second connecting rod, which is far away from the first connecting rod, is fixedly connected with a rotating shaft of the rotating motor, and a shell of the rotating motor is fixedly arranged on the surface of the base;
the vacuum die suite comprises a die plate, a vacuum cover and a vacuum exhaust pipe; the die plate is arranged in a vacuum cavity formed by the vacuum cover and the top surface of the rotating platform in a surrounding mode, the bottom surface of the die plate is connected with the top surface of the rotating platform, and a plurality of sample grooves for containing the mixing materials are formed in the top surface of the die plate; the vacuum exhaust pipe penetrates through the vacuum cover and is communicated with a vacuum cavity formed by surrounding the vacuum cover and the rotating platform.
2. The emulsified asphalt preferred method for cold mix asphalt based on rheological properties according to claim 1, wherein the step of pre-treating comprises: and (3) cleaning, drying, cooling and grinding each engineering mineral aggregate in sequence, and sieving with a 0.075mm sieve to obtain the mineral aggregate.
3. The preferred method for emulsifying asphalt for cold mix asphalt based on rheological properties according to claim 1, wherein the mixable time is 200s or more.
4. The method for optimizing emulsified asphalt for cold mix asphalt based on rheological properties according to claim 1, wherein the conditions for curing are: the health is carried out for 12 hours at 25 ℃ and then for 12 hours at 40 ℃.
5. The preferred method for emulsifying asphalt for cold mix asphalt based on rheological properties according to claim 1 wherein the step of performing dynamic shear rheological test on the plurality of sets of residues comprises:
Respectively carrying out stress scanning on each group of residues to determine a linear viscoelasticity range;
based on the determined linear viscoelastic range, each set of residues is scanned for temperature and frequency, respectively, resulting in corresponding shear modulus parameters.
6. The emulsified asphalt preferable method for cold mix asphalt based on rheological property according to claim 1, wherein the expression of the evaluation index function is as follows:
，
wherein, Representing an evaluation index concerning the interaction of the emulsified asphalt and mineral powder,/>Is complex modulus of emulsified asphalt mastic,/>For complex modulus of emulsified bitumen residues,/>Representing the volume fraction of the mineral powder incorporation.
7. The method for optimizing emulsified asphalt for cold mix asphalt mixture based on rheological property according to claim 1, wherein the highest intensity of the evaluation index in the several curves of the relationship between the evaluation index and temperature is the optimal relationship, and the combination mode of the emulsified asphalt and mineral powder corresponding to the optimal relationship is the optimal combination mode.
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