CN114778406B - An evaluation method for determining the degree of asphalt adsorption by aggregates - Google Patents
An evaluation method for determining the degree of asphalt adsorption by aggregates Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 147
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 57
- 238000011156 evaluation Methods 0.000 title claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000011010 flushing procedure Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 10
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000004364 calculation method Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 206010003591 Ataxia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G01N1/38—Diluting, dispersing or mixing samples
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N2015/0866—Sorption
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Abstract
The invention discloses an evaluation method for determining the adsorption degree of aggregates on asphalt, which comprises the steps of ultrasonically cleaning flushing aggregates, mixing two types of asphalt with different masses and aggregates with single particle size to obtain two types of asphalt-coated aggregate samples, cutting the two types of samples to obtain cross sections, photographing SEM micro areas of the cross sections to obtain the thickness of asphalt films on the surfaces of the two types of aggregate samples, and obtaining an evaluation index-adsorption coefficient C of the aggregates on the adsorption degree of asphalt according to the mass of asphalt during mixing and the measured thickness of asphalt films and the following formula: Wherein, C is an index representing the adsorption degree of aggregates to asphalt, namely the adsorption coefficient, is defined as the mass of asphalt adsorbed by aggregates per unit mass, m 1、m2 is the asphalt dosage during two times of mixing, g is unit, h 1、h2 is the asphalt film thickness measured by two aggregate samples, cm is unit, and m is the mass of aggregates during mixing. The invention can quantitatively evaluate the adsorption degree of aggregates with different particle diameters on asphalt through the adsorption coefficient C, and has guiding significance for determining the asphalt dosage in the preparation process of asphalt mixture.
Description
Technical Field
The invention relates to an evaluation method for determining the adsorption degree of aggregates to asphalt, in particular to a method for solving the problem that the asphalt adsorption amount of aggregates per se cannot be determined when the asphalt dosage is considered in the current aggregate-asphalt mixing process, and belongs to the technical field of highway pavement materials.
Background
Asphalt mixture is a pavement material which is formed by mixing asphalt as binder, coarse aggregate, fine aggregate and mineral powder as aggregate at a certain temperature according to a certain matching design, and is widely applied to roads and railways due to the advantages of certain high-temperature stability, no need of setting construction joints, convenient maintenance, recycling and the like. When the asphalt amount of the mixture is designed, if the aggregate quality is certain, the excessive asphalt amount can cause higher cost and possibly cause serious diseases such as oil flooding, and the insufficient asphalt amount can cause serious problems such as insufficient adhesion between aggregates, aggregate falling and the like. Therefore, the reasonable asphalt consumption is the key for ensuring the quality of asphalt mixture. Because the aggregate surface has many tiny pores, the asphalt material will be adsorbed in the pores of the aggregate, and thus the asphalt usage is made up of two parts, one part being the amount of adsorption by the aggregate into the internal pores and the other part being the effective amount of asphalt filling between the aggregate interstices. The asphalt adsorption quantity of aggregates in the asphalt mixture at present is determined according to the technical Specification for highway asphalt pavement construction, and the specification is based on the following relation: To determine the asphalt absorption coefficient C, where w x is the water absorption of the aggregate, this relationship was derived by several teachings of the university of ataxia according to a number of experiments. Determining the effective relative density of the aggregate from the apparent relative density of the aggregate, the bulk density and the asphalt absorption coefficient, and finally according to the formula The proportion of asphalt binder absorbed by the aggregate in the asphalt mixture, P ba, is determined, where γ se is the aggregate effective relative density, γ sb is the aggregate composite bulk density, and γ b is the asphalt density. From the above calculation process, it can be seen that the asphalt adsorption amount determined by this method mainly depends on the value of the asphalt absorption coefficient, and the learner finds that, under the condition that the water absorption of the aggregate is the same, the asphalt absorption rate varies greatly, that is, the asphalt absorption rate of the aggregate is affected by the type of the mineral aggregate and the type of the asphalt, except the water absorption of the mineral aggregate, so that the asphalt adsorption amount calculated by the formula specified by the specification is not high in accuracy, and a plurality of tests are required to determine some parameters in the formula.
In view of the foregoing, there is a need for an accurate and efficient method for quantifying the adsorption degree of asphalt by an aggregate, determining the adsorption amount of asphalt in the aggregate, and providing a necessary basis for research of interaction between asphalt and aggregate.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an evaluation method for determining the adsorption degree of aggregates on asphalt, which is characterized in that the adsorption coefficient C is an evaluation index of the adsorption degree according to the difference between different asphalt dosages and corresponding film thicknesses by actually measuring the thickness of asphalt.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for determining the adsorption degree of aggregates on asphalt is characterized by comprising the steps of ultrasonically cleaning flushing aggregates, mixing two types of asphalt with aggregates with different mass and single particle size to obtain two types of aggregate samples coated with asphalt, cutting the two types of samples to obtain cross sections, photographing SEM micro areas of the cross sections to obtain the thickness of asphalt films on the surfaces of the two types of aggregate samples, and obtaining an adsorption coefficient C of the evaluation index of the aggregates on the adsorption degree of asphalt according to the mass of asphalt during mixing and the measured thickness of asphalt films and the following formula:
Wherein, C is an index representing the adsorption degree of aggregate to asphalt, namely an adsorption coefficient, is defined as the mass of asphalt adsorbed by aggregate per unit mass, m 1、m2 is the asphalt dosage during two times of mixing, g is unit, h 1、h2 is the asphalt film thickness measured by two aggregate samples, cm is unit, and m is the mass of aggregate during mixing.
Preferably, ultrasonic cleaning of the flushing aggregate comprises flushing the aggregate with an ultrasonic cleaner to wash away dust and impurities from the surface of the aggregate, thereby avoiding the dust and impurities from entering micro-pores in the aggregate and affecting the asphalt adsorption quantity result.
Preferably, the single particle size aggregate has a particle size of 4.75-9.5mm and a mass of 1000g.
Preferably, the mass of the two kinds of asphalt during mixing is respectively 15g and 20g.
Preferably, obtaining the aggregate cross section includes cutting from the aggregate head with a small cutter to obtain a flat aggregate-asphalt cross section to obtain an aggregate-asphalt interface to measure asphalt film thickness.
Preferably, measuring the thickness of the asphalt film comprises the steps of carrying out scanning electron microscope SEM micro-area photographing experiments on the obtained aggregate-asphalt cross section, amplifying a sample, finding the interface between the aggregate and the asphalt, selecting a proper position and measuring the thickness of the asphalt film according to a scale by using a measuring function.
Preferably, 4 aggregate samples of regular shape are randomly selected for dicing, each sample selecting 3 suitable areas to test asphalt film thickness, for less variability to ensure accuracy of the test.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The invention can quantify the adsorption degree of the aggregate to the asphalt, and simultaneously has simple calculation formula for calculating the adsorption amount of the asphalt in the aggregate, the thickness of the asphalt film is obtained through actual measurement, and the calculation result is reliable.
Drawings
FIG. 1 is a schematic representation of asphalt adsorption in the internal pores of an aggregate.
Fig. 2 is an aggregate-asphalt interface observed in SEM scanning electron microscopy.
Detailed Description
The following describes the technical scheme of the invention in detail with reference to a certain example:
The inventor finds through experiments that an environment Scanning Electron Microscope (SEM) can clearly observe the interface between asphalt and aggregate, has a measuring function, can realize accurate measurement of the thickness of asphalt film, and in the design of asphalt mixture, the asphalt adsorption capacity is unchanged for the same batch of aggregate by changing the asphalt consumption and the corresponding asphalt film thickness, so that the asphalt adsorption capacity can be calculated through the asphalt consumption and the corresponding asphalt film thickness difference. Specifically, the technical scheme of the invention is as follows:
A method for determining the adsorption degree of asphalt by an aggregate is characterized by comprising the steps of ultrasonically cleaning and flushing the aggregate, mixing two types of asphalt with different qualities and aggregates with single particle size to obtain two types of asphalt-coated aggregate samples, cutting the two types of samples to obtain cross sections, photographing SEM micro areas of the cross sections to obtain the thickness of asphalt films on the surfaces of the two types of aggregate samples, and obtaining an evaluation index-adsorption coefficient C of the asphalt adsorption degree by the aggregate according to the quality of asphalt during mixing and the measured thickness of the asphalt films and the following formula:
Wherein, C is an index representing the adsorption degree of aggregates to asphalt, namely the adsorption coefficient, is defined as the mass of asphalt adsorbed by aggregates per unit mass, m 1、m2 is the asphalt dosage during two times of mixing, g is unit, h 1、h2 is the asphalt film thickness measured by two aggregate samples, cm is unit, and m is the mass of aggregates during mixing. The invention can quantitatively evaluate the adsorption degree of aggregates with different particle diameters on asphalt through the adsorption coefficient C, and has guiding significance for determining the asphalt dosage in the preparation process of asphalt mixture.
In order to facilitate the understanding of the public, the following detailed description of the technical solution of the present invention will be given with reference to a specific example.
1) Preparing before test, weighing 2 parts of 1000g basalt aggregate with the particle size of 4.75-9.5mm, washing the aggregate clean by an ultrasonic cleaner, removing dust and sundries attached to the surface, and then putting the basalt aggregate into an oven for drying.
2) 2 Parts of aggregate were mixed with 15g and 20g of No. 70 base asphalt, respectively, at 160 ℃ for 100s to obtain two asphalt mixtures.
3) And randomly selecting 4 aggregates with regular shapes from the two asphalt mixtures, namely 8 aggregates in total, and cutting the 8 aggregates by using a small-sized cutting machine to obtain a flat asphalt-aggregate cross section sample.
4) And (3) carrying out an environment scanning electron microscope SEM micro-area photographing test on the 8 obtained asphalt-aggregate cross section samples, quickly and clearly finding the interface between asphalt and aggregate due to the smooth aggregate surface and the rough surface of the asphalt surface, selecting three proper areas as shown in fig. 2, measuring the thickness of the asphalt film, and taking an average value.
5) The asphalt amounts of the samples and the measured asphalt film thicknesses are shown in table 1 below.
TABLE 1 asphalt film thickness (10-4 cm) data sheet
The amount of asphalt (M) in the aggregate consists of two parts, one part being the amount (a) adsorbed inside the aggregate and the other part being the amount (b=ρ×s×1000×h) coated on the surface of the aggregate, wherein the amount adsorbed inside the aggregate is related to the aggregate only and is independent of the amount of asphalt, so that the a values in the samples of two different asphalt amounts are the same. Knowing that asphalt density ρ=1.03 g/cm 3 then the asphalt coating amount of the first sample=1.03×s×1000×50.3×10 -4 =5.18S, the asphalt coating amount of the second aggregate sample=1.03×s×1000×67.8×10 -4 =6.98S, the asphalt usage of the first aggregate m 1 =15 g, and the asphalt usage of the second aggregate m 2 =20 g, the following two formulas can be obtained:
5.18S+A=15 (1)
6.98S+A=20 (2)
(2) - (1) to obtain 1.8s=5, and substituting s=2.7 cm 2/g into (1) to obtain 1000g basalt aggregate having a particle size of 4.75 to 9.5mm, the asphalt adsorption amount a=15 to 5.18×2.7=1.01 g.
The absorption coefficient of basalt aggregate with the thickness of 4.75-9.5mm to asphalt
The above calculation process can obtain a general formula of the adsorption coefficient C through a certain derivation:
The derivation process is as follows:
ρ×S×m×h1+A＝m1 (3)
ρ×S×m×h2+A＝m2 (4)
(3) Xh 2-(4)×h1, ah 2-Ah1＝m1h2-m2h1 (5)
Then
Defining the adsorption coefficient C as the mass of the aggregate adsorption asphalt per unit mass, and then:
according to the above procedure, the adsorption factor C is defined as:
Wherein, C is an index representing the adsorption degree of aggregates to asphalt-adsorption coefficient, m is the mass of aggregates during mixing, m 1、m2 is the asphalt dosage during mixing for two times, g is the mass of asphalt adsorbed by aggregates, g is h 1、h2 is the thickness of asphalt film measured by two aggregate samples, cm is the density of asphalt used, g/cm 3 is the specific surface area of aggregates used, and cm 2/g is S.
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| CN106032978A (en) * | 2016-07-28 | 2016-10-19 | 长安大学 | A Calculation Method of Asphalt Film Thickness on Aggregate Surface in Asphalt Mixture |
| CN109490192A (en) * | 2018-11-15 | 2019-03-19 | 南京林业大学 | A kind of test method of pitch and coarse aggregate adhesion |
| US11009450B2 (en) * | 2018-12-31 | 2021-05-18 | Instrotek, Inc. | Systems and methods for quality testing of asphalt by predicting an indirect tensile strength ratio of the asphalt sample based on the binder loss value |
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