CN104297294A - Asphalt mixture workability detection device based on stirring current value and detection method - Google Patents
Asphalt mixture workability detection device based on stirring current value and detection method Download PDFInfo
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- CN104297294A CN104297294A CN201410487937.6A CN201410487937A CN104297294A CN 104297294 A CN104297294 A CN 104297294A CN 201410487937 A CN201410487937 A CN 201410487937A CN 104297294 A CN104297294 A CN 104297294A
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Abstract
The invention discloses an asphalt mixture workability detection device based on a stirring current value and a detection method. The detection device comprises a shell and a standard specimen tube, wherein a temperature sensor, a stirrer, a variable-speed motor, an ammeter, a mixing pot and an electric device are arranged in the shell; a heating and heat-preservation device is arranged in the mixing pot; the temperature sensor is arranged on a main shaft and in a stirring blade and the mixing pot, a control panel and a display screen are arranged on the shell, and the control panel comprises a temperature button, an electric device button and a control button. The detection method comprises the steps of calibrating by the detection device and carrying out testing standard step, wherein the testing standard step comprises the steps of heating the mixing pot to be at the temperature required by the testing, recording the temperature value and the current value of the stirrer during stirring uniformly, reducing the temperature of the mixing pot to be at the another temperature required by testing, recording the current values at different temperatures during cooing and analyzing the recorded temperatures and the currents. The device can evaluate the workability of the asphalt mixture, and can determine the optical mixing temperature of the asphalt mixture.
Description
Technical field
The present invention relates to a kind of asphalt construction workability pick-up unit and detection method, being specifically related to a kind of asphalt workability pick-up unit based on stir current value and detection method, for evaluating the quality of asphalt construction workability.
Background technology
Asphalt workability is an important parameter in work progress, directly affect that compound mixes and stirs, the effect of compacting, thus the pavement performance of decision bituminous pavement and serviceable life.
2008, Hou Shuguang utilized the test of the asphalt workability index tester of research and development under different temperatures and different speed of agitator, the heat of different grading types mixes and stirs the workability index of Warm-Mix Bitumen Mixture.Result of study shows: affect asphalt workability index because have speed of agitator, temperature, nominal maximum aggregate size etc.Chang An University Guo Ping, Duan Lingyun adopts the construction workability of Asphalt Mixture Experiment instrument to Sasobit Warm-Mix Bitumen Mixture to study, its construction workability is measured under different temperatures and different frequency, and be analyzed with hot-mix asphalt mixture, test findings shows that the asphalt of admixture Sasobit is when mix temperature reduces by 30 DEG C, has the construction workability identical with hot-mix asphalt mixture.
1978, Mavillet and Bougault proposed the trial research measuring asphalt construction workability in bitumen for road use worker association.Its achievement in research may be summarized to be following 4 points: the first, and bituminous cements viscosity grade lowers, and the construction workability of asphalt improves; The second, the change of bitumen content does not have a direct impact construction workability; 3rd, in asphalt, filer content increases, then compound integral construction workability reduces; 4th, the particles of aggregates corner angle better then mixture construction workability of composition compound is poorer.
2003, Auburn University of U.S. Jagan M.Gudimettla, the people such as L.Allen cooley have carried out correlative study to the workability of hot-mix asphalt mixture, utilize the mixture construction workability pick-up unit of research and development to carry out workability test, the result of test illustrates: the standard workability checkout equipment of research and development can reflect the quality of hot-mix asphalt mixture workability.2009, Tao and Mallick utilized the dial torque wrench workability pick-up unit of research and development to have studied the impact of these two kinds of warm-mixing agents of Sasobit H8 and Advera zeolite on Recycled Asphalt Pavement ground surface material construction workability and mechanical property.Research finds: add the viscosity that warm-mixing agent Sasobit H8 and Advera zeolite all contributes to reducing Recycled Asphalt Pavement ground surface material, thus improve the construction workability of Recycled Asphalt Pavement ground surface material.2010, Magawer and Austerman of Massachusetts, USA university utilizes University of Massachusetts's asphalt workability pick-up unit of research and development to assess Warm-Mix Bitumen Mixture construction workability and compaction capacity, adopts different warm-mixing agent to mix the bituminous cements of PG76-22 grade with different volumes in research.Result shows construction workability and the compactingproperties that the Evotherm 3G mixing the Rediset and 0.6% of 2% can improve asphalt.2013, the people such as the Ayman Ail of Ohio, USA University of Akron utilize University of Akron's asphalt pick-up unit of research and development to study foam Warm-Mix Bitumen Mixture workability, test adopts the bituminous cements of PG64-28, PG70-22 two kinds of grades, and two types are gathered materials and two kinds of nominal maximum aggregate size compounds.Research finds: no matter be hot-mix asphalt mixture or foam Warm-Mix Bitumen Mixture, and its construction workability is all subject to the factor impacts such as cementitious matter grade, Aggregate Type, nominal maximum aggregate size; It is poorer than using the hot-mix asphalt mixture workability of crushed gravel to use the hot-mix asphalt mixture of ls, and plate form rubber is just the opposite, this illustrates that the construction workability that Aggregate Type mixes and stirs Warm-Mix Bitumen Mixture for heat has different impact effects.
The domestic research for asphalt workability is also few, in research few in number, does not have proposition one to obtain evaluation index and the evaluation method of extensively accreditation.
Summary of the invention
For the deficiency that prior art exists, the object of the invention is to provide a kind of asphalt workability pick-up unit based on stir current value and detection method, can evaluate the quality of asphalt construction workability, that can determine asphalt the best mixes and stirs temperature.
To achieve these goals, the present invention realizes by the following technical solutions:
The thinking of invention is as follows, mix and stir in process at asphalt, stirrer can be subject to resistance, resistance larger explanation compound is more difficult to be mixed and stirred, not easily pave during construction and roll, therefore the variable-speed motor driving stirrer to rotate needs output more high-power, according to physics P=U*I, current value is directly proportional to power, thus current value can increase along with output power of motor and increase in stirring circuit, therefore, the construction workability of asphalt can indirectly be reflected by measuring current value size in stirring circuit.Therefore pick-up unit of the present invention has following effect: a certain determine temperature under, more different compound stirs the current value size flow through in variable-speed motor in circuit in the process of mixing and stirring, reaction different materials mix and stir complexity; Stir the current value size flow through in variable-speed motor in circuit according to compound when difference mixes and stirs temperature, thus determine that the best mixes and stirs temperature.
Asphalt workability pick-up unit based on stir current value of the present invention, comprising housing, also comprising the standard specimen tube for determining test material consumption; Be provided with in housing temperature sensor, stirrer, for drive stirrer to rotate variable-speed motor, with the reometer of the circuit connected in series of variable-speed motor, be arranged on mixing and stirring pot and can make to mix and stir the electric device that pot moves up and down below stirrer; The main shaft of stirrer is provided with at least two panels stirring vane, mixes and stirs in pot and is provided with heating and heat-insulating device; Temperature sensor is arranged on main shaft, stirring vane is inner and mix and stir in pot; Housing is provided with control panel and the display screen for showing current value and temperature value, control panel comprising temperature button for controlling heating and heat-insulating device, driving mix and stir electric device button that pot moves up and down and the control knob for controlling variable-speed motor for controlling electric device.
Above-mentioned case inside is provided with chute, and electric device comprises and mixes and stirs slide block that pot is fixedly connected with and for promoting the electric pushrod that slide block moves up and down along chute; The strut that described electric pushrod comprises motor and is connected with motor output shaft, the other end of strut is connected with slide block.
Above-mentioned variable-speed motor is connected with stirrer by reductor, and the output shaft of variable-speed motor is connected with the input end of reductor by shaft coupling, and the output terminal of described reductor is connected with the input end of stirrer.
The main shaft of above-mentioned stirrer is provided with three stirring vanes, and three described stirring vanes are separately positioned on main shaft upper, middle and lower three positions, for reducing the probability forming shear surface in whipping process; The angle of inclination being positioned at stirring vane is above set to become 135 ° of angles with sense of rotation, the angle of inclination being positioned at middle stirring vane is set to keep vertical with sense of rotation, and the angle of inclination being positioned at stirring vane is below set to the angle at 45 ° with sense of rotation.
The above-mentioned pot that mixes and stirs is provided with for controlling to mix and stir that 90 degree, pot rotates mixes and stirs pot handle.
The bottom of above-mentioned housing is provided with the wheel being convenient to pick-up unit movement.
The detection method of the asphalt workability pick-up unit based on stir current value of the present invention, comprises following step:
(1) pick-up unit is demarcated: detect the result of demarcating gained and be used for reference, be equivalent to object of reference, hereafter asphalt test findings with detect the results contrast demarcated, the just workability quality of known asphalt.Testing standard does the standard step of asphalt workability test, carries out after rating test is obtained a result.
(1a) switch on power, described mix and stir the vacant situation of pot under, start stirrer by described control knob, record the current value of reometer during the idle running of described stirrer;
(2a) standard calibration material is poured in standard specimen tube, utilize the neat cylinder top of scraper to strike off to gather materials, and the transfer of gathering materials in described standard specimen tube is poured into mix and stir in pot, start stirrer by described control knob to start to stir, the current value of reometer during record stirring described standard calibration material;
(2) testing standard:
(1b) according to testing the asphalt sample needing mixing in advance good to be measured, be placed in baking oven to be incubated, described standard specimen tube is also placed in baking oven and is incubated, and opens heating and heat-insulating device in advance by described temperature control burtons simultaneously, by described mix and stir pot be heated to test temperature required;
(2b) described asphalt sample is poured in standard specimen tube, the neat cylinder top of scraper is utilized to strike off asphalt sample, and the asphalt sample transfer in described standard specimen tube is poured into and mixed and stirred in pot, press described electric device button, described electric device will mix and stir pot and upwards be pushed into upper change point, start stirrer start to stir by described control knob;
(3b) after startup is mixed and stirred, when described stirrer at the uniform velocity stirs, record the temperature value on described display screen and the current value on reometer, then, control heating and heat-insulating device by described temperature control burtons, make to mix and stir pot temperature and drop to test another temperature required, start described stirrer and stir asphalt sample, along with the decline of described asphalt specimen temperature, the current value in record cooling whipping process at each temperature;
(4b) at the end of to be tested, press described electric device button, described electric device will mix and stir pot and drop to lower-limit point, described in mix and stir pot reset, last powered-down;
(5b) (analytical approach: the workability evaluating asphalt according to the size of the current value under relevant temperature is good and bad is analyzed to the electric current at the temperature of all records and relevant temperature, as the analysis of Examples below, detection method does not comprise analytical procedure), for evaluating the workability of asphalt.
In step (2a), what described standard calibration material specifically adopted is 2.36mm ~ 4.75mm shelves limestone aggregates, described standard calibration material collects in order to reusing after a procedure, for avoiding the demarcation affecting pick-up unit because of the difference of standard calibration material behavior described in different batches.
In step (2a), after every ten workability detection experiment, pick-up unit is demarcated again, for guaranteeing the accuracy of test findings.
The present invention by visual stir current value and corresponding temperature, thus can evaluate the construction workability quality of asphalt intuitively, and can determine asphalt the best mix and stir temperature.
Accompanying drawing explanation
Fig. 1 is the asphalt workability structure of the detecting device schematic diagram based on stir current value of the present invention;
Fig. 2 is standard specimen tube structural representation of the present invention;
Fig. 3 is workability current value detection figure under matrix pitch SUP13 compound different temperatures;
Fig. 4 is workability current value detection figure under SBS modified bitumen SUP13 compound different temperatures;
Fig. 5 is that under SUP13 compound (matrix & modification) different temperatures, workability current value detects figure.
Respectively number in figure: 1, housing, 2, variable-speed motor, 3, shaft coupling, 4, reductor, 5, stirring vane, 6, chute, 7, strut, 8, motor, 9, display screen, 10, stirrer, 11, mix and stir pot handle, 12, mix and stir pot, 13, wheel, 14, reometer, 15, standard specimen tube, 16, slide block.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
See Fig. 1 and Fig. 2, a kind of asphalt workability pick-up unit based on stir current value of the present invention, comprise housing 1 and standard specimen tube 15, standard specimen tube 15 can determine test material consumption.In the present embodiment, standard specimen tube 15 internal diameter is 30cm, is highly 40cm.
Housing 1 inside be provided with temperature sensor, stirrer 10, for drive stirrer 10 to rotate variable-speed motor 2, with the reometer 14 (reometer 14 maximum range 10A, precision 0.5 grade) of the circuit connected in series of variable-speed motor 2, be arranged on mixing and stirring pot 12 and can make to mix and stir the electric device that pot 12 moves up and down below stirrer 10.
The main shaft of stirrer 10 is provided with three and is arranged on differing heights and forms the stirring vane 5 of different angles with sense of rotation.Mix and stir in pot 12 and be provided with heating and heat-insulating device.
Temperature sensor is arranged on main shaft, stirring vane 5 is inner and mix and stir pot 12 inside; For comprehensive mensuration temperature, reduce temperature detection error.
Housing 1 is provided with control panel and the display screen 9 (real time temperature in display process of the test for showing current value and temperature value, reading in reometer 14 screen current value at the corresponding temperature can acquisition test data), control panel comprising temperature button for controlling heating and heat-insulating device, driving and mix and stir pot 12 for controlling electric device and rise to the electric device button of upper change point and lower-limit point and the control knob for controlling variable-speed motor 2.
Variable-speed motor 2 is connected with stirrer 10 by reductor 4, and the output shaft of variable-speed motor 2 is connected by the input end of shaft coupling 3 with reductor 4, and the output terminal of reductor 4 is connected with the input end of stirrer 10.
Be provided with chute 6 inside housing 1, electric device comprises and mixes and stirs slide block 16 that pot 12 is fixedly connected with and for promoting the electric pushrod that slide block 16 moves up and down along chute 6; The strut 7 that electric pushrod comprises motor 8 and is connected with motor 8 output shaft, the other end of strut 7 is connected with slide block 16.
Three stirring vanes 5 are separately positioned on main shaft upper, middle and lower three positions, for reducing the probability forming shear surface in whipping process; The angle of inclination being positioned at stirring vane 5 is above set to become 135 ° of angles with sense of rotation, for ensureing that the compound mixed and stirred bottom pot 12 can be scooped up stirring by stirring vane 5 in whipping process; Be positioned at middle stirring vane 5 and keep vertical with sense of rotation, and stirring vane 5 forms a less radian in the opposite direction of sense of rotation, prevent the aggregate of greater particle size from emanating in whipping process, run to the edge mixing and stirring pot 12, ensure that greater particle size aggregate can continue evenly to mix and stir with all the other compounds; The angle of inclination being positioned at stirring vane 5 is below set to the angle at 45 ° with sense of rotation, forms for impelling compound the trend fallen downwards.
Mix and stir and pot 12 is also provided with for controlling to mix and stir that 1290 degree, pot rotates mixes and stirs pot handle 11.
The bottom of housing 1 is provided with the wheel 13 being convenient to pick-up unit movement, and machine conveniently moving is laborsaving, substantially increases Mobile portable.
In the present embodiment, variable-speed motor 2 can realize three kinds of different rotating speeds, is respectively 10rpm/min, 20rpm/min, 30rpm/min.
In the present embodiment, housing 1 is rigid metal construction, is the workbench of whole table apparatus.
Detection method of the present invention is as follows:
(1) be first the scaling method of pick-up unit:
(1a) switch on power, do not hold any material for making clothes mixing and stirring in pot 12, when stirrer 10 dallies, current value is about 2.9-3.0A, and stirrer 10 rotating speed elects 20rpm/min as;
(2a) utilize standard specimen tube 15 to take and dry application specific standard demarcation material 2.36mm ~ 4.75mm shelves limestone aggregates, pour in agitated kettle, start stirrer 10 to stir, current value is 3.0A ~ 3.2A (demarcates and collect after a procedure in order to reusing pick-up unit used gathering materials, avoid the characteristic of gathering materials because of different batches different and affect the qualification of standard detection device); After every 10 workability detection experiment, pick-up unit is demarcated.
(2) be then testing standard method:
(1b) ready asphalt and sample standard cartridge are placed in baking oven heating and thermal insulation; 12 to 170 DEG C, pot is mixed and stirred in heating in advance;
(2b) asphalt sample is poured in standard specimen tube 15, and utilize the neat cylinder top carefulness of scraper to strike off asphalt sample, and transfer is poured into and is mixed and stirred in pot 12, press electric device button, described electric device will mix and stir pot 12 and upwards be pushed into upper change point, start stirrer 10 start to stir by control knob;
(3b), after startup is mixed and stirred, when device 10 to be mixed at the uniform velocity stirs, the temperature value on described display screen 9 and the current value on reometer 14 is recorded; Make to mix and stir pot 12 temperature by temperature control burtons control heating and heat-insulating device and drop to 90 DEG C, start stirrer 10 and stir asphalt sample, along with described asphalt specimen temperature is down to 90 DEG C from 170 DEG C, the current value in record cooling whipping process at each temperature;
(4b) at the end of to be tested, press electric device button, electric device will mix and stir pot 12 and drop to lower-limit point, mix and stir pot 12 and will reset, last powered-down;
(5b) electric current under record temperature and relevant temperature is analyzed, for evaluating the workability of asphalt.Stir current value greatly then illustrates that asphalt sample workability is poor, and stir current value is little then illustrates that asphalt sample workability is good.
Analysis chart 3 ~ Fig. 5 is known:
No matter matrix pitch or modified bitumen, along with the rising of asphalt temperature, stir current value reduce, asphalt workability improves.
It is close that matrix pitch SUP13 compound mixes and stirs current value in circuit when 160 DEG C and 170 DEG C, can think that the workability of matrix pitch SUP13 compound at two kinds of temperature is almost identical.
When matrix pitch mixture temperature is lower than 100 DEG C, matrix pitch SUP13 compound workability sharply declines, mix difficulty, shows as stir current value interval and expands.
When modified asphalt mixture temperature is lower than 110 DEG C, modified asphalt mixture workability sharply declines, mix difficulty, shows as stir current value interval and expands.
When mixing and stirring temperature and being 170 DEG C, the SUP13 compound stir current value of basis bitumen and modified bitumen is close, can think that both workability are close.
When temperature is lower than 160 DEG C, at the same temperature, matrix pitch compound has good workability than SBS modified asphalt mixture.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (9)
1. based on an asphalt workability pick-up unit for stir current value, comprising housing (1) and it is characterized in that, also comprising the standard specimen tube (15) for determining test material consumption; Be provided with in described housing (1) temperature sensor, stirrer (10), for drive stirrer (10) to rotate variable-speed motor (2), with the reometer (14) of the circuit connected in series of variable-speed motor (2), be arranged on mixing and stirring pot (12) and can making to mix and stir the electric device that pot (12) moves up and down of stirrer (10) below;
The main shaft of described stirrer (10) is provided with at least two panels stirring vane (5), described in mix and stir in pot (12) and be provided with heating and heat-insulating device;
Described temperature sensor is arranged on main shaft, stirring vane (5) is inner and mix and stir in pot (12);
Described housing (1) is provided with control panel and the display screen (9) for showing current value and temperature value, described control panel comprising temperature button for controlling heating and heat-insulating device, driving mix and stir electric device button that pot (12) moves up and down and the control knob for controlling variable-speed motor (2) for controlling electric device.
2. the asphalt workability pick-up unit based on stir current value according to claim 1, is characterized in that,
Described housing (1) inner side is provided with chute (6), and described electric device comprises and mixes and stirs slide block (16) that pot (12) is fixedly connected with and for promoting the electric pushrod that slide block (16) moves up and down along chute (6); The strut (7) that described electric pushrod comprises motor (8) and is connected with motor (8) output shaft, the other end of described strut (7) is connected with slide block (16).
3. the asphalt workability pick-up unit based on stir current value according to claim 1, is characterized in that,
Described variable-speed motor (2) is connected with stirrer (10) by reductor (4), the output shaft of described variable-speed motor (2) is connected by the input end of shaft coupling (3) with reductor (4), and the output terminal of described reductor (4) is connected with the input end of stirrer (10).
4. the asphalt workability pick-up unit based on stir current value according to claim 1, is characterized in that,
The main shaft of described stirrer (10) is provided with three stirring vanes (5), and three described stirring vanes (5) are separately positioned on main shaft upper, middle and lower three positions, for reducing the probability forming shear surface in whipping process;
The angle of inclination being positioned at stirring vane (5) is above set to become 135 ° of angles with sense of rotation, the angle of inclination being positioned at middle stirring vane (5) is set to keep vertical with sense of rotation, and the angle of inclination being positioned at stirring vane (5) is below set to the angle at 45 ° with sense of rotation.
5. the asphalt workability pick-up unit based on stir current value according to claim 1, is characterized in that,
Described mix and stir pot (12) be provided with for control mix and stir (12) 90 degree, pot rotation mix and stir pot handle (11).
6. the asphalt workability pick-up unit based on stir current value according to claim 1, is characterized in that,
The bottom of described housing (1) is provided with the wheel (13) being convenient to pick-up unit movement.
7. the detection method of the asphalt workability pick-up unit based on stir current value according to claim 1 to 6 any one, is characterized in that, comprise following step:
(1) pick-up unit is demarcated:
(1a) switch on power, described mix and stir pot (12) vacant situation under, start stirrer (10) by described control knob, the current value of reometer (14) when recording described stirrer (10) idle running;
(2a) standard calibration material is poured in standard specimen tube (15), utilize the neat cylinder top of scraper to strike off to gather materials, and the transfer of gathering materials in described standard specimen tube (15) is poured into mix and stir in pot (12), start stirrer (10) by described control knob to start to stir, the current value of reometer (14) during record stirring described standard calibration material;
(2) testing standard:
(1b) according to testing the asphalt sample needing mixing in advance good to be measured, be placed in baking oven to be incubated, described standard specimen tube (15) is also placed in baking oven and is incubated, open heating and heat-insulating device by described temperature control burtons in advance simultaneously, by described mix and stir pot (12) be heated to test temperature required;
(2b) described asphalt sample is poured in standard specimen tube (15), the neat cylinder top of scraper is utilized to strike off asphalt sample, and the asphalt sample transfer in described standard specimen tube (15) is poured into and mixed and stirred in pot (12), press described electric device button, described electric device will mix and stir pot (12) and upwards be pushed into upper change point, start stirrer (10) start to stir by described control knob;
(3b) after startup is mixed and stirred, when described stirrer (10) at the uniform velocity stirs, record the temperature value on described display screen (9) and the current value on reometer (14), then, heating and heat-insulating device is controlled by described temperature control burtons, make to mix and stir pot (12) temperature and drop to test another temperature required, start described stirrer (10) and stir asphalt sample, along with the decline of described asphalt specimen temperature, the current value in record cooling whipping process at each temperature;
(4b) at the end of to be tested, press described electric device button, described electric device will mix and stir pot (12) and drop to lower-limit point, described in mix and stir pot (12) reset, last powered-down;
(5b) electric current at the temperature of all records and relevant temperature is analyzed, for evaluating the workability of asphalt.
8. the detection method of the asphalt workability pick-up unit based on stir current value according to claim 7, is characterized in that,
In step (2a), what described standard calibration material specifically adopted is 2.36mm ~ 4.75mm shelves limestone aggregates, described standard calibration material collects in order to reusing after a procedure, for avoiding the demarcation affecting pick-up unit because of the difference of standard calibration material behavior described in different batches.
9. the detection method of the asphalt workability pick-up unit based on stir current value according to claim 7, is characterized in that,
In step (2a), after every ten workability detection experiment, pick-up unit is demarcated again, for guaranteeing the accuracy of test findings.
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