CN105891109A - Testing method for interface adhesion performance of road asphalt mixture - Google Patents
Testing method for interface adhesion performance of road asphalt mixture Download PDFInfo
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- CN105891109A CN105891109A CN201610189315.4A CN201610189315A CN105891109A CN 105891109 A CN105891109 A CN 105891109A CN 201610189315 A CN201610189315 A CN 201610189315A CN 105891109 A CN105891109 A CN 105891109A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention discloses a testing method for the interface adhesion performance of a road asphalt mixture. The method comprises the steps of performing sample preparation on original asphalt; performing short-term aging and sample preparation; performing pressure aging and sample preparation; performing a water freezing and thawing testing and salt freezing and thawing testing; preparing an aggregate test specimen; testing surface free energy parameters of asphalt and the aggregate test specimen; determining the asphalt and aggregate interface adhesion performance; comparing interface adhesion performance indexes of various asphalt and aggregates on different conditions so as to select asphalt road materials suitable for being used under different climate environments. According to the testing method, asphalt and aggregate interface adhesion work on the drying condition, peeling work of an asphalt and aggregate interface on the water condition and a water stability index determined by the ratio of the adhesion work to the peeling work can be effectively calculated and obtained for different asphalt and aggregates under the different temperatures, aging conditions and different freezing and thawing cycle condition effects; scientific basis is provided for quality inspection and engineering characteristic evaluation of a cold region asphalt road material product.
Description
Technical field
The present invention relates to the method for testing of material adhesion energy, specifically Colophonium and aggregate Interface adhesiveness
The method of testing of energy., pressure aging at rotary thin film in drying oven including plain asphalt and modified asphalt mixture
The Colophonium that power is aging, temperature, water freeze and deicer salts corrodes under freeze-thaw cycle effect adheres to aggregate Interface
Merit, peeling merit and the test of water stability index.Belong to road construction field.
Background technology
Asphalt is the stock of making bituminous paving, Colophonium and the Interface Adhesion performance gathered materials
Directly affect serviceability and the service life of bituminous paving.A kind of complexity of asphalt is many
Phase, multiple dimensioned heterogeneous particulate reinforced composite, by bituminous cements, gathering materials forms, and it is each
Composition yardstick from micron to centimetre.The performance of bituminous paving depends primarily on bituminous cements and collection
Interface Adhesion performance between material and bituminous cements self property.
Cold district bituminous paving is under load, aging action, freeze-thaw cycle and deicer salts corrosion function
Easy cracking phenomenon, ultimately results in the destruction on road surface.In the destruction essence of bituminous paving is material
The accumulation of portion's microscopic damage and the result of internal composition structure deterioration, mainly due to Colophonium with gather materials
Interface adhesiveness deterioration causes.Colophonium and aggregate Interface adhesiveness and interfacial effect are to affect Colophonium to mix
Close the key factor of material performance, not only affect the deformation of asphalt, simultaneously also to its anti-low-temperature cracking
Property, high-temperature stability, water stability and anti-fatigue performance and Other Engineering characteristic have direct shadow
Ring.The infringement of some common bituminous pavings, including road surface cracking, fall the phenomenon such as grain and peeling all
It is considered as that the adhesion property with Colophonium Yu aggregate Interface has close relationship.
Cold district winter temperature is low, and when meeting with low temperature ice and snow weather, road surface is in load for a long time
During effect, snow water erosion, cryogenic freezing state and temperature alternate, due to moisture, temperature
And load jointly to act on the road freeze thawing breakoff phenomenon caused the most universal.It is generally believed that low temperature is opened
Split caused by the tension causing Asphalt Mixture at Low Temperature embrittlement to produce mainly due to temperature decrease, Colophonium
Compound anti-low-temperature cracking relies primarily on bituminous cements and the interfacial adhesion gathered materials.Deicing in the winter time
In maintenance processes, reduce the apparent freezing point of water by dispensing deicer salts, to reach automatically to melt ice and snow
Purpose.During deicing or snow melting, substantial amounts of water can be gathered in road surface, rolls lower entrance at driving vehicle
Pavement asphalt mixture space further results in road surface Moisture Damage, and Moisture Damage is mainly due to moisture attack
Colophonium and the interface gathered materials so that asphalt adhesion reduces and gradually loses adhesion, causes Colophonium thin
Film comes off from the surface gathered materials and damages.So the test to road asphalt compound Interface Adhesion performance
Just it is particularly important.
At present asphalt from asphalt mixture is had a variety of with the method for testing of aggregate Interface adhesion property,
Mainly include water-boiling method, water seaoning, photoelectric colorimetry and the clean absorption method of sharp etc..Water-boiling method and water
Leaching method principle is to reflect Interface Adhesion performance by test Colophonium with the percentage rate peeling off area that gathers materials,
This method there is problems in that and affected by artificial subjective factor many, and error is relatively big, due to collection charge level
Long-pending little, irregular area situation is complicated, measures the percentage rate peeling off area, due to this side so more difficult
Method is to carry out in the thermostatted water of certain condition, owing to the refraction of water makes peeling off the test of area more
Difficulty, therefore water-boiling method and water seaoning inadvisable；Photoelectric colorimetry is to be mixed by a number of Colophonium
Close material sample to be placed in the aqueous dye solutions of concentration known, the exposed general of surface of aggregate peeled off because of water logging
Absorbing dye, makes dye strength in aqueous solution decline, by spectrophotometer test dye concentration change,
Thus judge interfacial adhesion situation.This method is a kind of improvement of water-boiling method and water seaoning, although
Quantitative analysis can be carried out, and be affected by human factors less, but test operation procedure requires higher,
Data result repeatability is poor；The clean absorption method of sharp is also to use spectrophotometer test interface caking property
Can, it utilizes surface of aggregate in water-bitumen-aggregate system that Colophonium is had adsorption, makes Colophonium first
Colophonium concentration in benzole soln changes, and measures concentration with spectrophotometric, can calculate gather materials right
The adsorbance of Colophonium and the scaling amount of Colophonium after adding water, thus draw the peeling rate of Colophonium in surface of aggregate
Or adsorption rate, with the interface adhesiveness showing Colophonium with gather materials.The method test operation is complicated, to examination
The skill set requirements testing personnel is higher, the longest.
In sum, in the adhesivity evaluation method of Colophonium and mineral aggregate, water-boiling method, water seaoning,
The clean absorption method of SHRP, photoelectric colorimetry etc., owing to being affected by artificial subjective factor, exist bigger
Error.It is therefore desirable to find a kind of objective rational evaluation methodology.Due between Colophonium and mineral aggregate
Adhesive mechanism is more complicated, so various assessing theories and methods occurs, mainly have theory of mechanics,
Chemical reaction theory, molecular orientation theory, electrostatic theory, surface structure theory and surface free energy reason
Opinion.Yet with theory of mechanics, chemical reaction theory, molecular orientation theory, electrostatic theory, surface
Structural theory is suitable for describing qualitatively the adhesive mechanism of Colophonium and mineral aggregate, and the evaluation of these theories
Index calculates extremely complex, so to use concrete index size to weigh Colophonium and mineral aggregate adhesiveness
Quality be difficult to realize.Surface energy theory then can be by measuring Colophonium and the surface of surface of aggregate
Free energy parameter, then calculate Colophonium according to correlation theory formula quantitative scoring and gather materials at adhesion process and
The energy variation of stripping process, so that it is determined that Colophonium and the adhesiveness quality relation gathered materials.
Summary of the invention
The present invention is based on the defect that macroscopic view test method exists with evaluation theory at present, in order to fill up drip
Blue or green compound Colophonium and aggregate Interface under freeze-thaw cycle, temperature, short ageing and pressure aging condition
The blank of viscous viscosity energy quantitative measuring method, disclose Colophonium based on surface free energy theory with
The adhesiveness method of testing of aggregate Interface, it is achieved that the quantitative survey to Colophonium with aggregate Interface adhesiveness
Amount, particularly aging, temperature, freeze-thaw cycle, deicer salts erosion etc. act under to Colophonium with gather materials
The quantitative measurement of Interface Adhesion performance.
The present invention is achieved by the following technical solutions:
A. former state Colophonium sample preparation；
B. former state Colophonium is carried out short ageing sample preparation；
C. the Colophonium after short ageing is carried out pressure is aging and sample preparation；
D. former state asphalt test piece is carried out water freeze thawing test and salt freeze thawing test
D.1 when salt freezes, deicer salts concentration is 4%～12%,
D.2 the freezing temperature range of choice is-10 DEG C～-25 DEG C,
D.3 the freezing-thawing cycles range of choice is 10～25 times；
E. the preparation of aggregate sample；
F. with contact angle measurement, the surface free energy parameter of Colophonium and the test specimen that gathers materials is tested；
G. Colophonium and the determination of aggregate Interface adhesion property；
H. various Colophoniumes and Interface Adhesion performance index at different conditions of gathering materials are contrasted,
With the selected asphalt pavement material being suitable under Different climate environment and using.
The present invention can be effectively for different pitches with gather materials in different aging conditions and different freeze thawing
Under the influence of cycling condition, it is calculated Colophonium and aggregate Interface adhesion work under drying condition, has water condition
Lower Colophonium and the peeling merit of aggregate Interface, and the water determined by adhesion work and the ratio peeling off merit is stable
Property index；Aging condition can be according to execution conditions with when ground temperature is adjusted；Freeze-thaw cycles can
The temperature difference, the type of deicer salts and conventional using dosage according to location set freeze-thaw cycle test,
Can effectively select the Colophonium under different condition according to the Interface Adhesion performance index of present invention test to mix
Closing the material of material, quality inspection, engineering characteristic assessment for cold district asphalt pavement material product carry
Foundation for science.
Detailed description of the invention
Hereinafter the implementation process of the present invention is described in further detail:
A. former state Colophonium sample preparation
A.1 former state Colophonium is heated to happy and harmonious state, takes 4g and be cast in slide surface and make test specimen,
A.2 test specimen is put in baking oven, under conditions of 120 DEG C ± 5 DEG C, be incubated 20min, make Colophonium
Flat surface is formed in slide surface,
A.3 asphalt test piece is taken out from baking oven put in exsiccator standby；
B. former state Colophonium is carried out short ageing sample preparation
B.1 the whole sample bottles after having weighed are put in each bottle of position of baking oven toroidal frame, shut baking
Open toroidal frame rotating switch after chamber door, rotate with 15r/min ± 0.2r/min speed, start simultaneously at
The hot-air of flow velocity 4000mL/min ± 200mL/min is sprayed in the sample containing sample bottle being rotating,
At a temperature of the temperature of baking oven should go back up to 163 DEG C ± 0.5 DEG C in 10min, heated time is 75min, always
Persistent period is 85min,
B.2 after the time of advent, stop toroidal frame and rotate and jets of heated air, take out the most one by one and contain sample
Bottle, and rapidly sample is poured into mixing in clean container,
B.3 take out a small amount of Colophonium and prepare bitumen samples by method in above-mentioned a step；
C. the Colophonium after short ageing is carried out pressure is aging and sample preparation
C.1 the standard Thin Film Oven Test TFOT of known quality is contained sample dish to be placed on balance, add in dish
The Colophonium of 50g ± 0.5g, making asphalt membrane thickness is 3mm-3.5mm,
C.2 selection pressure aging temperature is 90 DEG C, presses pressure aging testing instrument " START " key and selects
" COOL ", presses " START " key screen and shows " preheat to 85please wait " now
Specimen mounting is placed in container, carries out container preheating,
C.3, after system warm-up temperature reaches 85 DEG C, point out " please complete load sample "
Open container, ready Sheng sample dish is put on the specimen mounting in pressure vessel, close container and twist
Bolt,
C.4, after the conditions such as preheating temperature meet, system starts pressurization,
C.5 after reaching predetermined pressure, it is aging that asphalt proceeds by pressure, and after 20h, system is certainly
Dynamic release, pressure is aging to be completed,
C.6 open pressure vessel, take out specimen mounting and contain sample dish, pour the residue of heat in dish into appearance
Device heats and stirs to remove bubble,
C.7 take out a small amount of Colophonium and prepare asphalt test piece by method in above-mentioned a step；
D. asphalt test piece is carried out water freeze thawing test and salt freeze thawing test
D.1 compound concentration is respectively 4%, 8%, 12% deicer salts solution, by molten for the deicer salts configured
Liquid is each with clear water standby a,
D.2 the former state asphalt test piece prepared is put in closed container, be injected separately into three kinds dense
The deicer salts solution of degree and clear water, solution should cover test specimen, and close,
D.3 the test specimen closed being put into GDJS, freezing temperature is set as mesh
Mark temperature-20 DEG C, persistent period 2h, melt temperature is set as 60 DEG C, persistently freezes 2h, so far one
Individual freeze-thaw cycle completes, and repeats salt according to above step and freezes and water freezes loop test, until it reaches
Target circulation number of times 10 times, 15 times, 20 times, 25 times,
D.4 it is up to the asphalt test piece after target circulation number of times take out respectively, puts in baking oven 120
DEG C ± 5 DEG C under conditions of be incubated 20min, put in exsiccator standby after taking-up；
E. the preparation of aggregate sample
E.1 gathering materials of selected shape rule cuts into the cube that the length of side is 60mm × 25mm × 5mm,
E.2 with buffing machine, surface of aggregate is polished, dry with putting into after distilled water flushing in baking oven, take
Go out to put in exsiccator standby；
F. with contact angle measurement, the surface free energy parameter of Colophonium and the test specimen that gathers materials is tested
F.1 Colophonium and the test specimen that gathers materials are individually placed on video optics contact angle measurement,
F.2 regulating CCD camera, the side profile making test specimen is clear,
The most respectively distilled water, glycerol and Methanamide are dropped in same surface of test piece,
F.4 regulate CCD camera, make drop clear at the three phase point of surface of test piece, and take pictures,
F.5 use automatic image to analyze system image is analyzed, try to achieve Colophonium or gather materials and drop
Contact angle,
F.6 in order to determine the impact of temperature, control on contact angle measurement during Contact-angle measurement
The temperature in test specimen cabin, such as-10 DEG C ,-15 DEG C ,-20 DEG C ,-25 DEG C etc., it is achieved enter under different temperatures
Row is measured；
G. Colophonium and the determination of aggregate Interface adhesion property
G.1 adhesion work and the determination of peeling merit, utilize three kinds of test liquids at Colophonium and aggregate sample table
The contact angle in face, calculates Colophonium and the surface free energy parameter gathered materials, passes through surface free energy parameter
Utilize adhesive model and peeling model calculates Colophonium and the adhesion work gathered materials, peeling merit,
G.2 the determination of water stability index, adhesion work and peeling work ratio are water stability index
H. various Colophoniumes and interface adhesiveness index at different conditions of gathering materials are contrasted, with
The selected asphalt pavement material being suitable under Different climate environment using
H.1 above test uses orthogonal, investigates multifactor multilevel impact, and to test
Result carries out computational analysis, to reduce testing time, shortens test period, and Testing factors selects test
Temperature, deicer salts concentration, freezing-thawing cycles three；Corresponding four levels of each factor, test temperature
Degree is for-10 DEG C ,-15 DEG C ,-20 DEG C ,-25 DEG C, and deicer salts concentration is 0,4%, 8%, 12%, freezes
Melting cycle-index is 10,15,20,25 times,
H.2 index test obtained carries out range analysis, and Colophonium of analyzing directly perceived adheres to aggregate Interface
Performance indications with the variation tendency of each factor,
H.3 index test obtained carries out variance analysis, by the F method of inspection result to orthogonal test
Carry out significance test, it is judged that the significance that inspection target is affected by factor level,
H.4 by former state Colophonium and aging after bitumen samples carry out with aggregate Interface adhesive property index
Contrast, infers the different affecting factors affecting laws to Colophonium Yu aggregate Interface mechanical property, determines suitable
Suitable Colophonium and the ground surface material that gathers materials.
Claims (2)
1. the method for testing of road asphalt compound Interface Adhesion performance, it is characterised in that be to pass through techniques below
Scheme realizes:
A. former state Colophonium sample preparation；
B. former state Colophonium is carried out short ageing sample preparation；
C. the Colophonium after short ageing is carried out pressure is aging and sample preparation；
D. former state asphalt test piece is carried out water freeze thawing test and salt freeze thawing test
D.1 when salt freezes, deicer salts concentration is 4%～12%,
D.2 the freezing temperature range of choice is-10 DEG C～-25 DEG C,
D.3 the freezing-thawing cycles range of choice is 10～25 times；
E. the preparation of aggregate sample；
F. with contact angle measurement, the surface free energy parameter of Colophonium and the test specimen that gathers materials is tested；
G. Colophonium and the determination of aggregate Interface adhesion property；
H. various Colophoniumes and Interface Adhesion performance index at different conditions of gathering materials are contrasted, with selected
It is suitable under Different climate environment the asphalt pavement material used.
The method of testing of road asphalt compound Interface Adhesion performance the most according to claim 1, it is special
Levy and be to be achieved through the following technical solutions:
A. former state Colophonium sample preparation
A.1 former state Colophonium is heated to happy and harmonious state, takes 4g and be cast in slide surface and make test specimen,
A.2 test specimen is put in baking oven, under conditions of 120 DEG C ± 5 DEG C, be incubated 20min, make Colophonium carry
Surface of glass slide forms flat surface,
A.3 asphalt test piece is taken out from baking oven put in exsiccator standby；
B. former state Colophonium is carried out short ageing sample preparation
B.1 the whole sample bottles after having weighed are put in each bottle of position of baking oven toroidal frame, shut oven door
Rear unlatching toroidal frame rotating switch, rotates with 15r/min ± 0.2r/min speed, starts simultaneously at flow velocity
The hot-air of 4000mL/min ± 200mL/min sprays in the sample containing sample bottle being rotating, and the temperature of baking oven should
At a temperature of going back up to 163 DEG C ± 0.5 DEG C in 10min, heated time is 75min, and total duration is 85min,
B.2 after the time of advent, stop toroidal frame and rotate and jets of heated air, take out the most one by one and contain sample bottle,
And mix in rapidly sample is poured into clean container,
B.3 take out a small amount of Colophonium and prepare bitumen samples by method in above-mentioned a step；
C. the Colophonium after short ageing is carried out pressure is aging and sample preparation
C.1 the standard Thin Film Oven Test TFOT of known quality is contained sample dish to be placed on balance, add in dish 50g ±
The Colophonium of 0.5g, making asphalt membrane thickness is 3mm-3.5mm,
C.2 selection pressure aging temperature is 90 DEG C, presses pressure aging testing instrument " START " key and selects " COOL ",
Press " START " key screen and show that specimen mounting is now placed in appearance by " preheat to 85please wait "
In device, carry out container preheating,
C.3, after system warm-up temperature reaches 85 DEG C, prompting " please complete load sample " is beaten
Drive container, ready Sheng sample dish put on the specimen mounting in pressure vessel, close container and twisted bolt,
C.4, after the conditions such as preheating temperature meet, system starts pressurization,
C.5 after reaching predetermined pressure, it is aging that asphalt proceeds by pressure, system automatically unloading after 20h,
Pressure is aging to be completed,
C.6 open pressure vessel, take out specimen mounting and contain sample dish, the residue of heat in dish is poured in container
Heat and stir to remove bubble,
C.7 take out a small amount of Colophonium and prepare asphalt test piece by method in above-mentioned a step；
D. asphalt test piece is carried out water freeze thawing test and salt freeze thawing test
D.1 compound concentration is respectively 4%, 8%, 12% deicer salts solution, by the deicer salts solution that configured with clear
Water is each standby a,
D.2 the former state asphalt test piece prepared is put in closed container, be injected separately into three kinds of concentration
Deicer salts solution and clear water, solution should cover test specimen, and close,
D.3 the test specimen closed being put into GDJS, freezing temperature is set as target temperature
Spending-20 DEG C, persistent period 2h, melt temperature is set as 60 DEG C, persistently freezes 2h, so far a freeze-thaw cycle
Complete, repeat salt according to above step and freeze and water freezes loop test, until it reaches target circulation number of times 10
Secondary, 15 times, 20 times, 25 times,
D.4 it is up to the asphalt test piece after target circulation number of times take out respectively, puts in baking oven 120 DEG C ± 5
It is incubated 20min under conditions of DEG C, puts in exsiccator standby after taking-up；
E. the preparation of aggregate sample
E.1 gathering materials of selected shape rule cuts into the cube that the length of side is 60mm × 25mm × 5mm,
E.2 surface of aggregate being polished with buffing machine, dry with putting into after distilled water flushing in baking oven, taking-up is put into
In exsiccator standby；
F. with contact angle measurement, the surface free energy parameter of Colophonium and the test specimen that gathers materials is tested
F.1 Colophonium and the test specimen that gathers materials are individually placed on video optics contact angle measurement,
F.2 regulating CCD camera, the side profile making test specimen is clear,
The most respectively distilled water, glycerol and Methanamide are dropped in same surface of test piece,
F.4 regulate CCD camera, make drop clear at the three phase point of surface of test piece, and take pictures,
F.5 use automatic image to analyze system image is analyzed, try to achieve Colophonium or gather materials and the connecing of drop
Feeler,
F.6 in order to determine the impact of temperature, during Contact-angle measurement, test specimen cabin on contact angle measurement is controlled
The temperature of room, such as-10 DEG C ,-15 DEG C ,-20 DEG C ,-25 DEG C etc., it is achieved measure under different temperatures；
G. Colophonium and the determination of aggregate Interface adhesion property
G.1 adhesion work and peel off the determination of merit, utilizes three kinds of test liquids on Colophonium and aggregate sample surface
Contact angle, calculates Colophonium and the surface free energy parameter gathered materials, and is utilized by surface free energy parameter and adheres to
Model calculates Colophonium and the adhesion work gathered materials, peeling merit with peeling off model,
G.2 the determination of water stability index, adhesion work and peeling work ratio are water stability index
H. various Colophoniumes and interface adhesiveness index at different conditions of gathering materials are contrasted, with selected suitable
Close the asphalt pavement material used under Different climate environment
H.1 above test uses orthogonal, investigates multifactor multilevel impact, and enters test result
Row computational analysis, to reduce testing time, shortens test period, and Testing factors selects test temperature, deicing
Salinity, freezing-thawing cycles three；Corresponding four levels of each factor, test temperature is-10 DEG C ,-15
DEG C ,-20 DEG C ,-25 DEG C, deicer salts concentration is 0,4%, 8%, 12%, freezing-thawing cycles is 10,15,
20,25 times,
H.2 index test obtained carries out range analysis, analysis Colophonium directly perceived and aggregate Interface adhesion property
Index with the variation tendency of each factor,
H.3 index test obtained carries out variance analysis, carries out the result of orthogonal test with F method of inspection
Significance test, it is judged that the significance that inspection target is affected by factor level,
H.4 by former state Colophonium and aging after bitumen samples contrast with aggregate Interface adhesive property index,
Infer the different affecting factors affecting laws to Colophonium Yu aggregate Interface mechanical property, determine suitable Colophonium and
Gather materials ground surface material.
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