CN202533431U - Shrinkage deformation tester for semi-rigid material of pavement - Google Patents

Shrinkage deformation tester for semi-rigid material of pavement Download PDF

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Publication number
CN202533431U
CN202533431U CN201220125059XU CN201220125059U CN202533431U CN 202533431 U CN202533431 U CN 202533431U CN 201220125059X U CN201220125059X U CN 201220125059XU CN 201220125059 U CN201220125059 U CN 201220125059U CN 202533431 U CN202533431 U CN 202533431U
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CN
China
Prior art keywords
temperature
semi
rigid
test specimen
humidity
Prior art date
Application number
CN201220125059XU
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Chinese (zh)
Inventor
陈梓宁
侯相琛
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哈尔滨工业大学
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Priority to CN201220125059XU priority Critical patent/CN202533431U/en
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Publication of CN202533431U publication Critical patent/CN202533431U/en

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Abstract

The utility model discloses a shrinkage deformation tester for a semi-rigid material of a pavement. The shrinkage deformation tester for the semi-rigid material of the pavement is of a closed box structure which is divided into an upper measuring chamber and a lower environment box by a horizontal partition board, and a box cover can be opened; the side wall of the box cover is provided with a humidity sensor, a temperature sensor, a heater, an illuminating lamp and a reserved ventilation opening communicated with the outside; the environment box is internally provided with a sprayer, an air blower and a refrigerating system; the sprayer, the air blower and the refrigerating system are communicated with the measuring chamber through pipelines, and a temperature and humidity controller is arranged at the outer part of the environment box; and a test piece frame is arranged on the horizontal partition board. The shrinkage deformation tester for the semi-rigid material of the pavement, provided by the utility model, is capable of simulating a pavement material shrinkage deformation condition under a natural environment and ensuring temperature, humidity and wind speed conditions required in the test piece testing process, has higher measurement precision, and is used for increasing the measurement efficiency and providing quality assurance for road construction.

Description

The dry-shrinkage deformed tester of road surface semi-rigid material
Technical field
The utility model relates to a kind of simulated roadway physical environment, measures the dry-shrinkage deformed instrument of semi-rigid material.
Background technology
China begins in road construction, to use lime-soil base from the fifties, and lime stabilization class semi-rigid material is the main basic unit type on road surface during highway in China is built always during thereafter 30 years.The beginning of the eighties, China accelerated the scale of highway construction along with the sustainable development of national economy, and at this moment cement stabilizing material basic unit also promotes the use of gradually.The construction of highway in China still is in peak phase up till now, and annual have several ten thousand kilometers highway to be open to the traffic in succession, comprising several thousand kilometers highway.The semi-rigid material of lime, flyash stabilizing material and cement stabilized type material accounts for more than 95% of each standard highway road surface base layer material consumption in the meantime.
Outstanding advantages such as semi-rigid sub-base material has the intensity height, and bearing capacity is big, and water stability is good, and plate body property is strong, so will widespread use in China's road basement material in present stage even quite long one period.Semi-rigid sub-base material also comes with some shortcomings when having outstanding advantage, and at present semi-rigid material is through after mixing and stirring compacting, especially when the semi-rigid type base making finish pave to surface layer before; Because the inner hydration that takes place of water evaporates and compound; The moisture of compound can constantly reduce, and effect and the charing contraction of middle water between capillary action, suction-operated, intermolecular effect, material mineral crystal or gelinite etc. take place owing to the minimizing of water, can cause that free water in the semi-rigid sub-base material capillary-size pore loses and produces volumetric contraction; Thereby in use form the dry microfracture that shrinks easily; This microfracture is the thin spot of semi-rigid sub-base material, and when environment temperature changed, semi-rigid sub-base material was under the effect repeatedly of temperature stress; The microfracture that drying shrinkage causes will constantly broaden, elongated; Thereby reflex to asphalt mat, cause the horizontal cracking that the road surface is closeer, influence road surface road-ability and permanance.Especially in recent years in order to improve the intensity of semi-rigid type base, and improve the consumption of binder cement, more aggravated the generation of drying shrinkage, make road surface drying shrinkage aggravation, pavement crack increases.
In order to reduce the dry contraction fissure of semi-rigid material; Improve the usability on road surface; Domestic a lot of department and unit have carried out the correlative study of evaluation of semi-rigid sub-base material shrinkage performance and dry shrinkage test method, have accumulated many useful data, draw some and have regular conclusion.But the drying shrinkage characteristic of ground surface material does not also have the instrument and equipment of unified assay method and specialty at present.Measuring method commonly used has three kinds: the one, in constant temperature oven, shrink with the drying of surface-mount type strain ga(u)ge mensuration material, and this method measuring accuracy is higher, and precision can reach 10 -5M, it is fit to smooth, the dry test specimen of test surfaces, and the semi-rigid material surface void is many, the test specimen water cut high, is unfavorable for pasting strainometer; Another kind is in constant temperature oven, to shrink with the drying of the digital strainometer mensuration of intelligent string formula material; Though this method overcomes some shortcomings of surface-mount type strain ga(u)ge; But this method only is suitable for testing the material with certain intensity; And the drying of semi-rigid type base is shunk and mainly to be occurred in behind basic unit's making before the asphalt mat making, and this moment, the intensity of material was also very low, shrinks so the digital strainometer of intelligent string formula also is not suitable for testing the drying of semi-rigid material.The third is the beam body test specimen employing hydrostatic profile of certain size, puts after the demoulding on the worktable of in vitro measurement drying shrinkage, and air dry is read the shrinkage of test specimen at different time through clock gauge.When reading shrinkage, measure the average moisture evaporation loss of subsequent use test specimen under identical physical environment, with this average moisture evaporation loss as the drying shrinkage test specimen, the mensuration process no longer reduces up to the test specimen water cut, till the reading of table is very little.This method test is simple to operate, but makes a fault easily, and the environment temperature and the humidity of test are uncontrollable, thereby causes that stringency of test is low, discreteness is big.
Therefore, for reducing pavement cracking, improve the usability on road surface; Prolong the serviceable life on road surface; Be necessary to develop road surface semi-rigid material drying shrinkage testing tool and test method, the shrinkage performance index is brought in the corresponding standard, instruct semi-rigid material design and construction.
The utility model content
For overcoming the defective of prior art; Accurately measure the drying shrinkage strain of semi-rigid material; The utility model provides a kind of reasonable in design, simple in structure, easy to use, instrument and equipment that the data of surveying are accurate, automaticity is high, with simulating natural environment, is used to measure the drying shrinkage strain of road surface semi-rigid material; The control dry shrinkage and cracking reduces pavement crack.
The utility model adopts following technical scheme to realize above-mentioned purpose:
The dry-shrinkage deformed tester of a kind of road surface semi-rigid material, it is the body structure of a sealing, and body structure is divided into the measuring chamber on top, the environmental cabinet of bottom by horizontal baffle, and case lid can be opened; It is characterized in that:
The ventilation reserved opening that the sidewall of measuring chamber is provided with humidity sensor, temperature sensor, well heater, illuminating lamp and is connected with the external world;
Be provided with sprayer, fan blower and refrigeration system in the environmental cabinet; Sprayer, fan blower and refrigeration system are connected with measuring chamber through pipeline, and the outside of environmental cabinet is provided with temperature and humidity controller;
Humidity sensor is connected with temperature and humidity controller through lead with temperature sensor, and temperature and humidity controller is handled humidity and temperature data that humidity sensor and temperature sensor collect, is converted into numeral and is presented on the temperature and humidity controller; Temperature and humidity controller is connected with well heater, refrigeration system and sprayer and the connection of the power switch of control heater, refrigeration system and sprayer is perhaps closed;
On horizontal baffle, be provided with the test specimen frame, the test specimen frame is made up of balance, roller, support frame; Balance is fixed on the horizontal baffle and as the base of test specimen frame, roller is fixedly connected on the balance with axle, places support frame on the roller, and the upper surface of support frame is used to place test specimen;
Be equipped with the column that is fixed on the horizontal baffle in the both sides of test specimen frame; On the position of column and center, test specimen side height such as grade spring pedestal is housed; Both ends of the spring contacts with spring pedestal, test specimen respectively; Spring and test specimen contact jaw are fixed with pad, and the column upper end is equipped with the displacement transducer folder through being threaded; One end of displacement transducer is fixed by the displacement transducer clamping, the other end contacts with pad, and displacement transducer places in the spring, is connected with computing machine through lead.
Preferably, described shim is 8cm * 8cm.
Preferably, described balance is an electronic balance.
Preferably, described support frame is a rectangular frame.
Preferably, described roller is provided with 4 at least, on per two rollers a support frame is set.
Compared with prior art, the present invention has following advantage:
Existing dry-shrinkage deformed test method processing ease is made a fault; Can not the residing environment temperature of real simulated, humidity and wind speed; Stringency of test is low, discreteness is big, and the casing of developing among the present invention is as test environment, can the simulating natural environment condition under the dry-shrinkage deformed condition of ground surface material; Temperature, humidity, spraying and air-blast device are set in the casing, can guarantee temperature required in the test specimen test process, humidity and wind friction velocity; And built-in electronic balance; Accurately evaluation quality loss measures dry-shrinkage deformed through displacement transducer in the measurement mechanism, has realized automatic data collection; Avoiding the manual read to fetch data influences the drying shrinkage test result; Have a higher measuring accuracy, improved the efficient of measuring, for the construction of highway provides quality assurance.
Description of drawings
Fig. 1 is the dry-shrinkage deformed tester structural representation of the road surface semi-rigid material of the utility model;
Fig. 2 is the local enlarged diagram of the dry-shrinkage deformed tester of the road surface semi-rigid material of the utility model;
Fig. 3 is the programmable system structural representation;
Fig. 4 is the outer computer structural representation.
Embodiment
Shown in Fig. 1-4, semi-rigid material dry-shrinkage deformed tester in road surface is by the closed box structure that forms that surrounds at the bottom of front side wall, rear wall, left side wall, right side wall, case lid 11, the case; Body structure is divided into two chambers up and down by horizontal baffle, is measuring chamber 1 above, is environmental cabinet 23 below; Case lid can be opened.
Be provided with humidity sensor 2, temperature sensor 3, well heater 12, illuminating lamp 13 in the measuring chamber 1; Be fixed with humidity sensor 2 and temperature sensor 3 on the left side wall in the measuring chamber 1; Be fixed with well heater 12 on the rear wall in the measuring chamber 1, the residing environment of test specimen is heated; The ventilation reserved opening 14 that right side wall in the measuring chamber 1 is provided with illuminating lamp 13 and communicates with the external world, illuminating lamp 13 are used for the illumination in the measuring chamber, and ventilation reserved opening 14 guarantees the circulation of air of measuring chamber.
Be provided with sprayer 4, fan blower 10 and refrigeration system 22 in the environmental cabinet 23; Sprayer 4, fan blower 10 and refrigeration system 22 are connected with measuring chamber 1 through pipeline, to certain humidity, wind speed and low-temperature test environment are provided in the measuring chamber; The outside of environmental cabinet is provided with temperature and humidity controller 21.
Humidity sensor 2 is connected with temperature and humidity controller 21 through lead with temperature sensor 3; Humidity sensor 2 is used to gather the moisture signal in the measuring chamber 1; Temperature sensor 3 is used to gather the temperature signal in the measuring chamber 1; Temperature and humidity controller 21 will be handled humidity and temperature data that humidity sensor 2 and temperature sensor 3 collect; Being converted into numeral is presented on the temperature and humidity controller; Temperature and humidity controller 21 is connected with well heater 12, refrigeration system 22 and sprayer 4 and the connection of the power switch of control heater 12, refrigeration system 22 and sprayer 4 is perhaps closed, and according to predefined humiture value, thereby indoor temperature is measured in realization, humidity is constant.
At measuring chamber 1 inner bottom part, promptly horizontal baffle is provided with the test specimen frame, and the test specimen frame is made up of electronic balance 19, six rollers 9, three support frames 18; Electronic balance 19 is as the base of test specimen frame; Be fixedly connected on the bottom baffles in the measuring chamber 1 with the screw threads for fastening web member; Roller 8 usefulness axle is fixedly connected on the electronic balance 19; Put a support frame 18 on per two rollers 9, support frame 18 is a rectangle frame, and support frame 18 can freely roll on roller 9.The upper surface of support frame 18 is used to place test specimen 5 at the trial, and test specimen 5 is the semi-rigid material test specimen, and test specimen 5 is a rectangular parallelepiped.
Be equipped with through the screw threads for fastening web member in the both sides of test specimen frame and be fixed on the column on the horizontal baffle 15 in the measuring chamber 1; On the column 15 with on the position of center, test specimen 5 side height such as grade the spring pedestal 16 of spring 17 is housed; Spring 17 is fixed with the pad that area is 8cm * 8cm with test specimen 5 contact jaws; The column upper end is equipped with displacement transducer folder 6 through being threaded; One end of displacement transducer 7 is fixed by the displacement transducer clamping, the other end contacts with pad, and displacement transducer 7 places in the spring 17, is connected with computing machine 20 through lead.
Test specimen deforms under temperature, humidity change condition, and displacement transducer 7 outputs to computing machine 20 with the deformational displacement of collecting test specimen 5, and computing machine 20 is handled through corresponding process software, calculates the coefficient of shrinkage of test specimen 5 under various environment.
The semi-rigid material coefficient of shrinkage determinator of the utility model can be placed 1 test specimen and measure in measuring chamber 1, can the drying shrinkage process of imitation specimen in physical environment, improve the precision of measuring.
Concrete method of application is following: open instrument case lid 11; In type rectangular parallelepiped test specimen 5 is placed on the support frame 18 reposefully; Test specimen 5 two ends are closely contacted with displacement transducer 7 respectively through spring 17, and test specimen 5 can closely contact with column 15 by the free movable pad 8 that also passes through under the effect of spring 17.But, through the simulation of the indoor wind of blower switch control survey, set requirement simultaneously to satisfy through temperature, humidity range and the rate of change in the CS setting measurement chamber 1 of temperature and humidity controller on the panel 21.
When beginning to test, under fixed temperature, because humidity change (reducing) in the measuring chamber 1; Test specimen 5 will shrink; Receive the effect of spring 17, the movable head of the two ends of test specimen 5 and displacement transducer 7 keeps in touch, and the data that 21 pairs of measuring chamber humidity sensors 2 of temperature and humidity controller, temperature sensor 3 are gathered in the process of the test are handled; When needing low temperature environment in the measuring chamber, temperature controller 21 will be controlled refrigeration system 22 and power connection; When needing hot environment in the measuring chamber, temperature controller 21 is with control heater 12 and power connection; When needing certain humidity in the measuring chamber, temperature controller 21 will be controlled sprayer 4 and power connection, in measuring chamber, spray water.Displacement transducer 7 outputs to computing machine 20 with the data of gathering; Computing machine 20 carries out digitized processing through the data that process software is gathered displacement transducer 7; Thereby calculate the contraction coefficient of test specimen 5 according to the test piece deformation amount and the ratio of test specimen original length, can also be through the percentage of water loss of electronic balance 19 data presented calculation testing pieces 5.

Claims (5)

1. dry-shrinkage deformed tester of road surface semi-rigid material, it is the body structure of a sealing, and body structure is divided into the measuring chamber on top, the environmental cabinet of bottom by horizontal baffle, and case lid can be opened; It is characterized in that:
The ventilation reserved opening that the sidewall of measuring chamber is provided with humidity sensor, temperature sensor, well heater, illuminating lamp and is connected with the external world;
Be provided with sprayer, fan blower and refrigeration system in the environmental cabinet; Sprayer, fan blower and refrigeration system are connected with measuring chamber through pipeline, and the outside of environmental cabinet is provided with temperature and humidity controller;
Humidity sensor is connected with temperature and humidity controller through lead with temperature sensor, and temperature and humidity controller is handled humidity and temperature data that humidity sensor and temperature sensor collect, is converted into numeral and is presented on the temperature and humidity controller; Temperature and humidity controller is connected with well heater, refrigeration system and sprayer and the connection of the power switch of control heater, refrigeration system and sprayer is perhaps closed;
On horizontal baffle, be provided with the test specimen frame, the test specimen frame is made up of balance, roller, support frame; Balance is fixed on the horizontal baffle and as the base of test specimen frame, roller is fixedly connected on the balance with axle, places support frame on the roller, and the upper surface of support frame is used to place test specimen;
Be equipped with the column that is fixed on the horizontal baffle in the both sides of test specimen frame; On the position of column and center, test specimen side height such as grade spring pedestal is housed; Both ends of the spring contacts with spring pedestal, test specimen respectively; Spring and test specimen contact jaw are fixed with pad, and the column upper end is equipped with the displacement transducer folder through being threaded; One end of displacement transducer is fixed by the displacement transducer clamping, the other end contacts with pad, and displacement transducer places in the spring, is connected with computing machine through lead.
2. semi-rigid material dry-shrinkage deformed tester in road surface according to claim 1 is characterized in that: described shim is 8cm * 8cm.
3. semi-rigid material dry-shrinkage deformed tester in road surface according to claim 1 is characterized in that: described balance is an electronic balance.
4. semi-rigid material dry-shrinkage deformed tester in road surface according to claim 1 is characterized in that: described support frame is a rectangular frame.
5. semi-rigid material dry-shrinkage deformed tester in road surface according to claim 1 is characterized in that: described roller is provided with 4 at least, on per two rollers a support frame is set.
CN201220125059XU 2012-03-29 2012-03-29 Shrinkage deformation tester for semi-rigid material of pavement CN202533431U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103558114A (en) * 2013-10-17 2014-02-05 长安大学 Device for testing oil absorption value of solid additives in bituminous pavement material
CN104359789A (en) * 2014-11-28 2015-02-18 长安大学 Soil body shrinkage limit tester based on image analyzing method
CN105445419A (en) * 2015-01-21 2016-03-30 长沙理工大学 Accelerated drying shrinkage testing method of semi-rigid base material of inorganic binding material
CN107607029A (en) * 2017-09-01 2018-01-19 吉林建筑大学 A kind of road surface semi-rigid material, which is dried, shrinks Quick testing instrument
CN108593704A (en) * 2018-06-07 2018-09-28 长安大学 A kind of system and method for measuring the cement stabilization base coefficient of expansion
CN108956960A (en) * 2018-04-03 2018-12-07 河海大学 Sulfate drying and watering cycle acts on the real-time measurement apparatus and method of lower cement-based material piece lengths variation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103558114A (en) * 2013-10-17 2014-02-05 长安大学 Device for testing oil absorption value of solid additives in bituminous pavement material
CN103558114B (en) * 2013-10-17 2019-02-19 长安大学 The oil factor test device of solid additive in a kind of asphalt pavement material
CN104359789A (en) * 2014-11-28 2015-02-18 长安大学 Soil body shrinkage limit tester based on image analyzing method
CN105445419A (en) * 2015-01-21 2016-03-30 长沙理工大学 Accelerated drying shrinkage testing method of semi-rigid base material of inorganic binding material
CN107607029A (en) * 2017-09-01 2018-01-19 吉林建筑大学 A kind of road surface semi-rigid material, which is dried, shrinks Quick testing instrument
CN108956960A (en) * 2018-04-03 2018-12-07 河海大学 Sulfate drying and watering cycle acts on the real-time measurement apparatus and method of lower cement-based material piece lengths variation
CN108593704A (en) * 2018-06-07 2018-09-28 长安大学 A kind of system and method for measuring the cement stabilization base coefficient of expansion

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C17 Cessation of patent right
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Granted publication date: 20121114

Termination date: 20130329