CN109164005A - The determination method of condensed water ratio in asphalt mortar, bituminous mortar - Google Patents
The determination method of condensed water ratio in asphalt mortar, bituminous mortar Download PDFInfo
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- CN109164005A CN109164005A CN201811203279.8A CN201811203279A CN109164005A CN 109164005 A CN109164005 A CN 109164005A CN 201811203279 A CN201811203279 A CN 201811203279A CN 109164005 A CN109164005 A CN 109164005A
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- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The determination method of condensed water ratio in asphalt mortar, bituminous mortar.Belong to pavement construction material detection field.Lack the determination method to condensed water ratio in asphalt mortar, bituminous mortar at present.The present invention measures the equilibrium adsorption capacity under each humidity of asphalt mortar, bituminous mortar test specimen under drying condition；Calculate the balance desorption rate of test specimen under each humidity；Maintenance data analysis software obtains the adsorption-desorption curve of asphalt mortar, bituminous mortar test specimen；Water molecule layer thickness is calculated again, and obtain the relationship under water molecule layer thickness and the damp condition in asphalt mortar, bituminous mortar between water content, draw the curve graph of equilibrium moisture content and water molecule layer thickness, the difference subtracted each other by the straight line integral area of curve integral area and maximum slope obtains condensed water ratio in test specimen with the ratio of the gross area.The present invention realizes the division of condensed water ratio in asphalt mortar, bituminous mortar, is failure mechanism providing method of the Research on Asphalt Mixture under vaporous water effect, has reference to the durability for improving bituminous pavement.
Description
Technical field
The invention belongs to pavement construction material detection method field, in particular to condensed water ratio is drawn in a kind of asphalt mortar, bituminous mortar
Divide method.
Background technique
One of an important factor for moisture is influence durability of asphalt pavement.Since adsorptivity of the building stones to moisture is greater than pair
The adsorptivity of bituminous cements, so the junction that moisture can enter pitch and building stones both make mutually to remove, thus generate cracking,
Loose and pit-hole etc. is destroyed；This free surface moisture can also penetrate into inside bituminous cements the viscosity for reducing pitch.These two aspects it is common
Effect makes the intensity of bituminous pavement, and the service life of bituminous pavement is shortened in durability decline.
It has been generally acknowledged that liquid water is the sole cause for causing Water Damage on Asphalt Pavement, but a large amount of engineering practice shows pitch
Road surface Moisture Damage is not only present in moist area of heavy rainfull, and Moisture Damage phenomenon also largely occurs in drought area, as China is sweet
Respectful province, the Inner Mongol, Xinjiang Autonomous Region, the state Ya Lisangna in the U.S. etc..The reason of causing these arid area road surface Moisture Damages be
Since atmospheric water vapor content is few, underground water is diffused up in the form of vaporous water under the driving of moist gradient, accumulates in drip
Green road surface pore interior and cause.Therefore, vaporous water is the important branch of Water Damage on Asphalt Pavement to bituminous pavement damage research,
But this mechanism is not paid attention to for a long time.
In addition, there are different degrees of condensations in adsorption process for vaporous water, since condensed water is vaporous water more
One of the key feature of transmission characteristic in the medium of hole, so condensation of the research vaporous water in asphalt mortar, bituminous mortar just seems especially
It is important；And condensed water ratio is the evaluation index of vaporous water condensing characteristic, but not yet a kind of method is come in asphalt mortar, bituminous mortar at present
The ratio of condensed water is divided.The method that this patent will be combined using experimental and theoretical analysis, to realize in asphalt mortar, bituminous mortar
The division of condensed water ratio.
Summary of the invention
The purpose of the present invention is to solve lacking at present in asphalt mortar, bituminous mortar the problem of the determination method of condensed water ratio,
And provide a kind of asphalt mortar, bituminous mortar in condensed water ratio determination method.
A kind of determination method of condensed water ratio in asphalt mortar, bituminous mortar, is achieved through the following technical solutions:
Step 1: φ 100mm × 80mm cylindrical body asphalt mortar, bituminous mortar test specimen is prepared with gyratory compaction method, followed by cutting
Machine is made 100mm × 4 φ ± 1mm flat sheet specimen, and test specimen diameter height compares for 10-40, and aqueous vapor may be implemented along an axial dimensional expansion
It dissipates；
Carry out the full humidity of RH30%~RH90% under the conditions of Step 2: determining any temperature value within the scope of 0~50 DEG C
Range adsorption test:
Firstly, the quality of the flat sheet specimen of measurement drying, measures it in the environment of relative humidity is 30% later and reaches
Quality when adsorption equilibrium, relative humidity successively increase 10%, measure flat sheet specimen later after increasing relative humidity each time
Humidity reaches test specimen quality W when adsorption equilibrium∞, according to formulaThe balance for calculating flat sheet specimen under each humidity is inhaled
Attached amount；
Carry out the full humidity of RH90%~RH30% under the conditions of Step 3: determining any temperature value within the scope of 0~50 DEG C
Range desorption test:
Firstly, flat sheet specimen is placed in the environment that relative humidity is RH95% 12 hours, measure when it reaches stable
Quality W'0, relative humidity is reduced to 90% later, measures quality of the flat sheet specimen when the humidity reaches stable, the two phase
Flat sheet specimen can be obtained in the desorption rate of relative humidity 90% by subtracting, and humidity is successively reduced to 30% with 10% reduction amount later,
Measure quality w' when flat sheet specimen under each relative humidities reaches balance∞, according to formulaIt calculates each wet
Spend the balance desorption rate of lower flat sheet specimen；
Step 4: step 2 adsorption test and step 3 desorption after the test, maintenance data analyze software to suction
Data during adhesion test and desorption test are fitted, to obtain the adsorption-desorption cycle curve of flat sheet specimen；
Step 5: water molecule layer statistical thickness is calculated, with Origin Software on Drawing asphalt mortar, bituminous mortar test specimen water content and water
The curved line relation of molecular layers thick calculates the ratio that condensed water accounts for adsorpting water quantity；So far condensed water ratio in asphalt mortar, bituminous mortar is completed
Division.
The invention has the benefit that
The present invention by adsorption-desorption cycle test and data analysis method, draw out balanced in asphalt mortar, bituminous mortar it is aqueous
Amount is with the change curve of water molecule layer thickness, and when relative humidity is lower, equilibrium moisture content is linearly closed with water molecule layer thickness
System, when relative humidity is more than a certain value, puts down as the slope of being gradually increased for relative humidity, the relationship straight line is gradually increased
Weighing apparatus water content deviates considerably from respective linear relation, i.e., equilibrium moisture content is higher than the point on final straight line, at this time equilibrium moisture content and
Curved line relation, the difference subtracted each other by the straight line integral area of curve integral area and maximum slope is presented in water molecule layer thickness
Value calculates condensation water content, then the area that difference is integrated divided by curve can be obtained to the ratio of condensed water；In addition, the present invention from
The determination method of condensed water ratio in asphalt mortar, bituminous mortar is theoretically proposed, the analysis side of asphalt heat and mass is enriched
Method；This method can determine the minimum of the actual ratio of condensed water and various asphalts generation condensed water in asphalt mortar, bituminous mortar
Ambient humidity is failure mechanism providing method of the Research on Asphalt Mixture under vaporous water effect, enriches bituminous pavement water damage
Harmful research contents has reference to the durability for improving bituminous pavement.
Detailed description of the invention
Fig. 1 is adsorption test of the present invention and desorption test test specimen top view；
Fig. 2 is adsorption test of the present invention and desorption test test specimen side view；
Fig. 3 is adsorption test of the present invention and desorption test data fitting curve graph；
Fig. 4 is condensed water proportion schematic diagram of the present invention；
Specific embodiment
Specific embodiment 1:
Present embodiment provides a kind of division methods of condensed water proportion in asphalt mortar, bituminous mortar, specifically according to following
What step carried out
Step 1: φ 100mm × 80mm cylindrical body asphalt mortar, bituminous mortar test specimen is prepared with gyratory compaction method, followed by cutting
Machine is made 100mm × 4 φ ± 1mm flat sheet specimen, and test specimen diameter height compares for 10-40, and aqueous vapor may be implemented along an axial dimensional expansion
It dissipates, refers to that aqueous vapor is transmitted from upper and lower surface rather than is transmitted from side surface；
Carry out the full humidity of RH30%~RH90% under the conditions of Step 2: determining any temperature value within the scope of 0~50 DEG C
Range adsorption test:
Firstly, the quality of the flat sheet specimen of measurement drying, measures it in the environment of relative humidity is 30% later and reaches
Quality when adsorption equilibrium, relative humidity successively increase 10%, measure flat sheet specimen later after increasing relative humidity each time
Humidity reaches test specimen quality W when adsorption equilibrium∞, according to formulaThe balance for calculating flat sheet specimen under each humidity is inhaled
Attached amount；
Carry out the full humidity of RH90%~RH30% under the conditions of Step 3: determining any temperature value within the scope of 0~50 DEG C
Range desorption test:
In order to measure test specimen in the desorption rate of this point of RH90%, firstly, flat sheet specimen is placed on relative humidity being
12 hours in the environment of RH95%, quality W' when it reaches stable is measured0, relative humidity is reduced to 90% later, measurement
Quality of the flat sheet specimen when the humidity reaches stable, the two, which is subtracted each other, can obtain flat sheet specimen in the desorption rate of relative humidity 90%,
Humidity is successively reduced to minimum 30% with 10% reduction amount later, flat sheet specimen under each relative humidities is measured and reaches
To quality w' when balancing∞, according to formulaCalculate the balance desorption rate of flat sheet specimen under each humidity；
Step 4: step 2 adsorption test and step 3 desorption after the test, maintenance data analyze software to suction
Data during adhesion test and desorption test are fitted, to obtain the adsorption-desorption cycle curve of flat sheet specimen；
Step 5: water molecule layer statistical thickness is calculated, with Origin Software on Drawing asphalt mortar, bituminous mortar test specimen water content and water
The curved line relation of molecular layers thick calculates the ratio that condensed water accounts for adsorpting water quantity；So far condensed water ratio in asphalt mortar, bituminous mortar is completed
Division.
Specific embodiment 2:
Unlike specific embodiment one, the determination method of condensed water ratio in the asphalt mortar, bituminous mortar of present embodiment,
The test of step 2 and step 3 provides constant temperature and humidity condition using climatic chamber, and container internal relative humidity is by being saturated
Salting liquid or distilled water maintain, and external container relative humidity is maintained by climatic chamber；
Other steps and parameter are same as the specific embodiment one.
Specific embodiment 3:
Unlike specific embodiment one or two, the determination side of condensed water ratio in the asphalt mortar, bituminous mortar of present embodiment
Method, the analysis software of maintenance data described in step 4 is fitted the data during adsorption test and desorption test, to obtain
Obtain the process of the adsorption-desorption cycle curve of flat sheet specimen are as follows:
Maintenance data analyzes software, by GAB model formation calculated equilibrium adsorbance and balance desorption rate, such as 1 institute of formula
Formula:
In formula, W indicates equilibrium adsorption capacity or balance desorption rate, equilibrium adsorption capacity areCalculate gained, balance
Desorption rate isCalculate gained, WmIt indicates that single molecular layer saturated absorption or monolayer are saturated desorption rate, is
Corresponding adsorbance, desorption rate when absorption interface is only completely covered in hydrone in a manner of monolayer adsorption, desorption；C indicates first layer
Water Molecular Adsorption energy constant or first layer hydrone Desorption Energy constant, K are multilayer Water Molecular Adsorption energy constant or multilayer hydrone
Constant is desorbed, is the difference of outer layer hydrone Yu liquid water energy state, value range is 0~1, shows outer layer closer to 1
Energy state is more close between hydrone (i.e. water molecule layer except the 1st layer of hydrone) and liquid water molecules；P indicates that water steams
Atmospheric pressure, P0Indicate steam-laden pressure；P/P0Indicating relative vapour pressure, vapor relative humidity is indicated in the form of decimal,
Value range is 0~1.
Other steps and parameter are identical as specific implementation method one.
Specific implementation method four:
Unlike specific embodiment three, the determination method of condensed water ratio in the asphalt mortar, bituminous mortar of present embodiment,
Calculating condensed water described in step 5 accounts for the ratio of overall adsorption water specifically:
Step 5 one, water molecule layer thickness are calculated by Harkins-Jura equation, using Step 2: opposite in three
Humidity data is calculated, as shown in formula (2):
Wherein, t indicates the water molecule layer statistical thickness being adsorbed, unit 10-10M, RH are relative humidity；
Step 5 two, using relative humidity as bridge, isothermal adsorption and desorption curve data are turned with Origin software
The relationship for turning to equilibrium moisture content and water molecule layer thickness in asphalt mortar, bituminous mortar under the damp condition, the relationship drawn between the two are bent
Line chart；Origin software has the function of curve matching, and the curve matching in Origin is using based on Levernberg-
The Non-linear least-square curve fitting of Marquardt algorithm (LMA)；
Step 5 three, when relative humidity is lower, equilibrium moisture content and water molecule layer thickness are in linear relation, with opposite
Humidity is gradually increased, and the slope of the relationship straight line is gradually increased, and when relative humidity is more than a certain value, equilibrium moisture content is obvious
Deviate respective linear relation, i.e. equilibrium moisture content is higher than the point on final straight line, at this time equilibrium moisture content and water molecule layer thickness
When curved line relation is presented, the difference subtracted each other by the straight line integral area of curve integral area and maximum slope is calculated cold
Condensate content, then condensed water ratio is obtained in flat sheet specimen by the ratio that difference accounts for the gross area and is condensed to get into asphalt mortar, bituminous mortar
Water ratio, physical relationship are as shown in Figure 4:
Other steps and parameter are identical as specific implementation method one.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment: asphalt mortar, bituminous mortar test specimen raw material is andesite, and SBS modified pitch and simple substance miberal powder, material parameter are shown in Table 1,
1 asphalt mortar, bituminous mortar material for test parameter of table
Step 1: prepare the cylindrical body asphalt mortar, bituminous mortar test specimen of φ 100mm × 80mm with gyratory compaction method, followed by cutting
100mm × 4 φ ± 1mm flat sheet specimen is made in cutting mill, meets diameter height ratio 10-40, may be implemented along axial one-dimensional diffusion；
Test grade is matched in the AC-13 gradation recommended according to " Code for constrution and acceptance of asphat pavement " (GBJ 50092-1996)
Value, selections particle size range be 1.18mm~0.075mm, holding gradation internal ratio it is constant recalculate to obtain test grade used
Match；Ratio of filler bitumen is 1.2:1；Cylindrical specimen is prepared using gyratory compaction molding method, having a size of φ 100mm × 63.5mm.
It is compacted drip according to " highway engineering pitch and Asphalt Mixture Experiment regulation " (JTG E20-2011) T0705-2011
Green mixture density test (surface drying method) measurement test specimen physical parameter simultaneously calculates voidage and theoretical maximum specific density.Then will
Cylindrical specimen is cut into 100mm × 2 φ~5mm thin plate, and to realize one-dimensional diffusion of moisture, test specimen is as shown in Figure 1 and Figure 2
Step 2: carrying out steady temperature 303K (30 DEG C), relative humidities are respectively 0.4,0.5,0.7,0.9 and 1 (leaching
Water) vaporous water adsorption test.Measure dry test specimen quality W0(kg) and under each damp condition (interval when reaching adsorption equilibrium
The weight gain of 24 hours or more test specimens is no more than the measurement accuracy of electronic balance) test specimen quality W∞(kg), according to formula
(kg/kg) equilibrium adsorption capacity under each humidity is calculated, as shown in table 2.
Adsorbance under each damp condition of table 2
Step 3: carrying out steady temperature 303K (30 DEG C), relative humidities are respectively 1 (immersion), 0.9,0.7,0.5 and
Test is desorbed in 0.4 vaporous water.Measure biggest quality W' of test specimen under the conditions of maximal humidity0And it is assigned in each damp condition
Interval 24 hours or more test specimen weight gain is no more than the measurement accuracy of electronic balance when to desorption equilibrium) test specimen quality W'∞, foundation
FormulaThe balance desorption rate of test specimen under each humidity is calculated, as shown in table 3.
Desorption rate under each damp condition of table 3
Step 4: absorption and desorption are after the test, maintenance data analyzes software to the data in absorption and desorption process
It is fitted, to obtain the adsorption-desorption cycle curve of asphalt mortar, bituminous mortar test specimen, as shown in Figure 3.
Step 5: calculating water molecule layer thickness by Harkins-Jura equation, it will adsorb-take off with Origin software
Attached curve data is converted into the relationship under water molecule layer thickness and the damp condition in asphalt mortar, bituminous mortar between water content, draws balance
The curve graph of water content and water molecule layer thickness, as shown in Figure 4.It is accounted for by the area difference that calculated curve integral is integrated with straight line
The ratio of the gross area obtains condensed water ratio in asphalt mortar, bituminous mortar, and by Fig. 4 by calculating, condensed water ratio accounts for overall adsorption water
The 8% of amount, so far the dividing condensed water ratio in asphalt mortar, bituminous mortar of the task are completed.
The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, this field
Technical staff makes various corresponding changes and modifications in accordance with the present invention, but these corresponding changes and modifications all should belong to
The protection scope of the appended claims of the present invention.
Claims (4)
1. a kind of determination method of condensed water ratio in asphalt mortar, bituminous mortar, which is characterized in that the division methods specifically include following
Step:
Step 1: φ 100mm × 80mm cylindrical body asphalt mortar, bituminous mortar test specimen is prepared with gyratory compaction method, followed by cutting mechanism
At 100mm × 4 φ ± 1mm flat sheet specimen, and test specimen diameter height compares for 10-40, and aqueous vapor may be implemented along axial one-dimensional diffusion；
Carry out the full humidity range of RH30%~RH90% under the conditions of Step 2: determining any temperature value within the scope of 0~50 DEG C
Adsorption test:
Firstly, the quality of the flat sheet specimen of measurement drying, measures it in the environment of relative humidity is 30% later and reaches absorption
Quality when balance, relative humidity successively increase 10%, measure flat sheet specimen humidity after increasing relative humidity each time later
Reach test specimen quality Woo when adsorption equilibrium, according to formulaCalculate the equilibrium adsorption of flat sheet specimen under each humidity
Amount；
Carry out the full humidity range of RH90%~RH30% under the conditions of Step 3: determining any temperature value within the scope of 0~50 DEG C
Desorption test:
Firstly, flat sheet specimen is placed in the environment that relative humidity is RH95% 12 hours, quality when it reaches stable is measured
W′0, relative humidity is reduced to 90% later, measures quality of the flat sheet specimen when the humidity reaches stable, the two is subtracted each other can
Flat sheet specimen is obtained in the desorption rate of relative humidity 90%, humidity is successively reduced to 30% with 10% reduction amount later, measurement
Quality w ' when flat sheet specimen reaches balance under each relative humidities∞, according to formulaIt calculates under each humidity
The balance desorption rate of flat sheet specimen；
Step 4: step 2 adsorption test and step 3 desorption after the test, maintenance data analyze software to absorption try
It tests and is desorbed the data during testing to be fitted, to obtain the adsorption-desorption cycle curve of flat sheet specimen；
Step 5: water molecule layer statistical thickness is calculated, with Origin Software on Drawing asphalt mortar, bituminous mortar test specimen water content and hydrone
The curved line relation of thickness degree calculates the ratio that condensed water accounts for adsorpting water quantity；So far stroke of condensed water ratio in asphalt mortar, bituminous mortar is completed
Point.
2. the determination method of condensed water ratio in a kind of asphalt mortar, bituminous mortar according to claim 1, which is characterized in that step 2
Test with step 3 provides constant temperature and humidity condition using climatic chamber, and container internal relative humidity is by saturated salt solution
Or distilled water maintains, external container relative humidity is maintained by climatic chamber.
3. the determination method of condensed water ratio in a kind of asphalt mortar, bituminous mortar according to claim 1 or 2, which is characterized in that step
Maintenance data described in rapid four is analyzed software and is fitted to the data during adsorption test and desorption test, to obtain thin slice
The process of the adsorption-desorption cycle curve of test specimen are as follows:
By the water adsorption fitting formula calculated equilibrium adsorbance and balance desorption rate of GAB model, such as 1 depicted of formula:
In formula, W indicates equilibrium adsorption capacity or balance desorption rate, WmIndicate single molecular layer saturated absorption or monolayer saturation
Desorption rate is that corresponding adsorbance, desorption rate when absorption interface is only completely covered in hydrone in a manner of monolayer adsorption, desorption；C table
Show that first layer Water Molecular Adsorption energy constant or first layer hydrone Desorption Energy constant, K are multilayer Water Molecular Adsorption energy constant, or more
Constant is desorbed in layer hydrone, is the difference of outer layer hydrone Yu liquid water energy state, value range is 0~1, closer to 1
Show that energy state is more close between outer layer hydrone and liquid water molecules；P indicates water vapour pressure, P0Indicate that vapor is full
And pressure；P/P0It indicates vapor relative humidity, is indicated in the form of decimal, value range is 0~1.
4. the determination method of condensed water ratio in a kind of asphalt mortar, bituminous mortar according to claim 3, which is characterized in that step 5
The calculating condensed water accounts for the ratio of overall adsorption water specifically:
Step 5 one, using Step 2: relative humidity data in three, calculates water molecule layer by Harkins-Jura equation
Thickness, as shown in formula (2):
Wherein, t indicates the water molecule layer statistical thickness being adsorbed, unit 10-10M, RH are relative humidity；
Step 5 two, using relative humidity as bridge, convert isothermal adsorption and desorption curve data to Origin software
Under the damp condition in asphalt mortar, bituminous mortar equilibrium moisture content and water molecule layer thickness relationship, draw relation curve between the two
Figure；
Step 5 three, when curved line relation is presented in equilibrium moisture content and water molecule layer thickness, pass through curve integral area and slope
The difference that maximum straight line integral area subtracts each other calculates condensation water content, then is obtained by the ratio that difference accounts for the gross area thin
Condensed water ratio is in piece test specimen to get the condensed water ratio into asphalt mortar, bituminous mortar.
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| CN103776749A (en) * | 2014-02-21 | 2014-05-07 | 哈尔滨工业大学 | Asphalt mortar water vapor permeability experiment device under evaluation pressurization conditions |
| CN108007811A (en) * | 2017-11-17 | 2018-05-08 | 哈尔滨工业大学 | A kind of division methods of vaporous water dispersal pattern in asphalt mortar, bituminous mortar |
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2018
- 2018-10-16 CN CN201811203279.8A patent/CN109164005B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1239669A (en) * | 1968-06-21 | 1971-07-21 | ||
| EP2412454A1 (en) * | 2010-07-30 | 2012-02-01 | Societa' Italiana Acetilene & Derivati S.I.A.D. S.p.A. in abbreviated form SIAD S.p.A. | Application of carbon dioxide in remediation of contaminated soils, sediments and aquifers |
| CN103776749A (en) * | 2014-02-21 | 2014-05-07 | 哈尔滨工业大学 | Asphalt mortar water vapor permeability experiment device under evaluation pressurization conditions |
| CN108007811A (en) * | 2017-11-17 | 2018-05-08 | 哈尔滨工业大学 | A kind of division methods of vaporous water dispersal pattern in asphalt mortar, bituminous mortar |
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| HUINING XU ET.AL: "Characterization of Moisture Vapor Diffusion in Fine aggregate mixtures using Fickian and non-Fickian models", 《MATERIALS AND DESIGN》 * |
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