CN104048886B - A kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method - Google Patents
A kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method Download PDFInfo
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- CN104048886B CN104048886B CN201410294454.4A CN201410294454A CN104048886B CN 104048886 B CN104048886 B CN 104048886B CN 201410294454 A CN201410294454 A CN 201410294454A CN 104048886 B CN104048886 B CN 104048886B
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Abstract
The invention discloses a kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method, shaping prism beam specimen, after carrying out full water to prism beam specimen, the freeze thawing phenomenon of the large initiation of Permafrost Area day and night temperature is simulated in freeze thawing, necessarily load the repeated action of the torture test simulating vehicle load of number of times on this basis, aforesaid freezing-thawing test and torture test are intersected and repeatedly carries out until prism beam specimen generation fatigure failure is with the comprehensive fatigue effect of combined reaction weather conditions and vehicular load.The inventive method is owing to being repeated Frozen-thawed cycled and tired repetitive process, and test figure more has realistic meaning; Consider the girder distortion that Frozen-thawed cycled causes, design stainless steel ware, reduces its distortion, for the torture test after freeze thawing is provided convenience.Testing equipment needed for the inventive method is comparatively simple, easy to operate, is convenient to test spread.
Description
Technical field
The present invention relates to road engineering test method technology, be specifically related to a kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method.
Background technology
The fatigue of asphalt refers to that material produces expendable strength retrogression and accumulates caused a kind of damage phenomenon under load repeat function, and the anti-fatigue ability of asphalt reflects it just bears reloading and the ability do not ruptured.The temperature fatigue that the fatigue being divided into traffic loading repeat function to cause according to the difference of load and temperature cycles effect cause, the former is because the repeat function of traffic loading, the microdeformation produced in pavement structure is accumulated, when this distortion continues to increase expansion, occur causing the breakage on road surface; And the latter is because the bituminous pavement of low temp area is chronically exposed in the larger environment of intensive ultraviolet, strong wind, diurnal inequality, the change of temperature longer cycle ground causes the mechanical periodicity of temperature field, Thermal Stress Field, when the accumulation of temperature stress exceedes the ultimate tensile strength (UTS) of asphalt, just will there is endurance failure in road surface.
The bituminous concrete pavement of Permafrost Area not only will stand the repeat function of traffic loading, and larger day and night temperature difference alternating action will be stood more, thus temperature fatigue cracking, temperature draw and traffic loading fatigue crack are the principal modes of road surface breakage, moreover, the existence of moisture also can cause the height alternately generation freeze thawing phenomenon repeatedly of asphalt and bituminous pavement Yin Wendu, and the generation of multigelation can aggravate the fatigure failure of asphalt and bituminous pavement further.So for the Special Geographic climatic environment of Permafrost Area, the anti-fatigue performance of Research on Asphalt Mixture after Frozen-thawed cycled is necessary, the mechanical behavior of reaction Permafrost Area pavement structure that can be actual.
Although related to indirect tensile test on frozen-thaw and the asphalt mixture fatigue testing of asphalt in existing Asphalt Mixture Experiment code, but there is no to consider asphalt freeze thawing and tired performance test so far simultaneously, more lack and can reflect that asphalt repeats the performance test of freeze thawing and Fatigue Load interval action repeatedly.This is also cause Permafrost Area asphalt mixture material selection unreasonable, easily causes one of major reason of later stage use disease.
Summary of the invention
The object of the invention is to provide a kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method, consider temperature impact and vehicular load impact, more meet the actual service conditions of pavement structure, the actual loading situation of bituminous pavement in Permafrost Area can be simulated more accurately, obtain the mechanical performance index of realistic service condition.
The present invention is by the following technical solutions:
A kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method, comprises the steps:
Step 1, foundation Bitumen Mix Design, milling process is taken turns according to T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, manufactured size is the asphalt plate test specimen of 400mm × 300mm × 50mm, asphalt plate test specimen is cut into the prism beam specimen of 381mm × 63.5mm × 50mm;
Under step 2, room temperature, prism beam specimen is put into tank, water logging there is not prism beam specimen, the tank that prism beam specimen is housed is placed in vacuum drying chamber, 15min under 97.3kpa vacuum tightness, make vacuum drying chamber recover atmospheric pressure state afterwards, and make prism beam specimen continue immersion 1h, complete prism beam specimen and to satisfy water;
Step 3, the prism beam specimen of full water to be taken out from tank, with the closely knit parcel of preservative film, put into rustless steel container, the rustless steel container that prism beam specimen is housed is put into constant temperature refrigerator, and freezing 4h at-18 DEG C, takes out prism beam specimen afterwards from rustless steel container, at room temperature put into tank to soak 30min, after prism beam specimen taken out from tank and preservative film torn, melt more than 4h, complete the Frozen-thawed cycled of prism beam specimen;
Step 4, by the prism beam specimen after freeze thawing according to T0739-2011 asphalt four-point bending fatigue life test in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, sets N number of loaded cycle, record test parameters and test findings;
Step 5, the prism beam specimen that loaded is repeated the Frozen-thawed cycled torture test of step 2 to step 4, until test specimen fatigure failure.
In step 4, N number of loaded cycle is determined as follows: by the prism beam specimen of step 1, without freeze thawing, directly carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, until the fatigure failure of prism beam specimen, obtain the fatigue loading cycles total degree of prism beam specimen, get total degree 1/10th are N.
The inside dimension of rustless steel container described in step 3 is 385mm × 65mm × 50mm.
Beneficial effect of the present invention:
1, the inventive method considers temperature impact and vehicular load impact, be repeated Frozen-thawed cycled and tired repetitive process, the actual loading situation of bituminous pavement in Permafrost Area can be simulated more accurately, obtain the mechanical performance index of realistic service condition, test figure more has realistic meaning; Secondly, consider the girder distortion that Frozen-thawed cycled causes, design stainless steel ware, reduces its distortion, for the torture test after freeze thawing is provided convenience.
2, because grating and the bitumen aggregate ratio of the asphalt on road surface, Permafrost Area selected by test specimen, Frozen-thawed cycled after full water also meets the thermal climate situation of permafrost region, the situation of temperature load suffered by asphalt under low temperature and the larger condition of the temperature difference can be simulated, make shop experiment have more rationality and validity.
3, circulated by thawing and repeatedly fatigue loading test, the Specifications after asphalt mixture cryogenic fatigue test can be obtained, the fatigue behaviour of reflection asphalt in the larger situation of the temperature difference, for the Asphalt Mixture Design of Permafrost Area provides foundation.Performance evaluation is carried out to different asphalts, just preferably can be applicable to the asphalt of Permafrost Area by comparative analysis.
4, the testing equipment needed for the inventive method is comparatively simple, easy to operate, is convenient to test spread.
Accompanying drawing explanation
Fig. 1 is a kind of rustless steel container provided by the invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention done and further explain.Following embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and is all among protection scope of the present invention.
The bituminous concrete pavement of Permafrost Area not only will stand the repeated action of vehicular load, larger day and night temperature difference alternating action will be stood simultaneously, consider the large and frost climate condition of the distinctive day and night temperature difference in Permafrost Area, asphalt Frozen-thawed cycled torture test under design low temperature contributes to the Asphalt Mixture Design of Permafrost Area, because Asphalt Mixture Design in the past has only looked after cryogenic property, lag behind the construction build technology of permafrost region like this.The present invention considers the particular service requirement of Permafrost Area, provides a kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method.
The mentality of designing of a kind of Permafrost Area provided by the invention asphalt Frozen-thawed cycled fatigue test method is: adopt freezing and thawing test simulation asphalt in the actual use procedure in Permafrost Area due to the day and night temperature difference large stood freezing with thaw weather conditions, adopt the vehicular load repeat function that torture test simulation asphalt stands, freezing and thawing test and torture test are carried out intersecting the combined action carried out with simulated climatic conditions and Vehicle Load, to obtaining the Frozen-thawed cycled fatigue behaviour of reaction asphalt under the microthermal climate condition of Permafrost Area, reference can not only be provided for the performance optimization of asphalt, can be used in the poor performance opposite sex contrasting different pitches compound simultaneously, preferably suitable ground surface material.
Embodiment 1
A kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method, comprises the steps:
Step 1, foundation Bitumen Mix Design, milling process is taken turns according to T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, indoor are mixed and stirred and are produced asphalt and shaping asphalt plate test specimen, be of a size of 400mm (length) × 300mm (wide) × 50mm (height), asphalt plate test specimen cut into the prism beam specimen of 381mm (length) × 63.5mm (wide) × 50mm (height); An asphalt plate test specimen can cut out four beam specimen, for ensureing revision test precision, at least answering shaping two plate test specimens, cutting out 8 beam specimen.
Under step 2, room temperature, prism beam specimen is put into tank, water logging there is not prism beam specimen, the tank that prism beam specimen is housed is placed in vacuum drying chamber, 15min under 97.3kpa vacuum tightness, opening valve afterwards makes vacuum drying chamber recover atmospheric pressure state, and makes prism beam specimen continue immersion 1h, completes prism beam specimen and to satisfy water.
Step 3, the prism beam specimen of full water to be taken out from tank, with the closely knit parcel of preservative film, put into rustless steel container, the rustless steel container that prism beam specimen is housed is put into constant temperature refrigerator, and freezing 4h at-18 DEG C, takes out prism beam specimen afterwards from rustless steel container, at room temperature put into tank to soak 30min, after prism beam specimen taken out from tank and preservative film torn, melt more than 4h, complete the Frozen-thawed cycled of prism beam specimen; As shown in Figure 1, inside dimension is 385mm (length) × 65mm (wide) × 50mm (height) to rustless steel container.Consider that the test specimen of full water moisture can occur when putting into refrigerator and overflows, in order to make the overall refrigerating effect of test specimen even, after water taking-up satisfied by test specimen, the closely knit parcel of preservative film should be adopted, simultaneously in order to prevent test specimen from Frozen-thawed cycled process afterwards, excessive distortion occurring, should, by test specimen as in rustless steel container, test specimen surrounding be made to produce constraint, keep its original shape, so that follow-up torture test.
Step 4, by the prism beam specimen after freeze thawing according to T0739-2011 asphalt four-point bending fatigue life test in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, sets N number of loaded cycle, record test parameters and test findings; N number of loaded cycle is determined as follows: by the prism beam specimen of step 1, without freeze thawing, directly carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, until the fatigure failure of prism beam specimen, obtain the fatigue loading cycles total degree of prism beam specimen, get total degree 1/10th are N.
Step 5, the prism beam specimen that loaded is repeated the Frozen-thawed cycled torture test of step 2 to step 4, until test specimen fatigure failure.
The shaping prism beam specimen of the present invention, after carrying out full water to prism beam specimen, the freeze thawing phenomenon of the large initiation of Permafrost Area day and night temperature is simulated in freeze thawing, necessarily load the repeated action of the torture test simulating vehicle load of number of times on this basis, aforesaid freezing-thawing test and torture test are intersected and repeatedly carries out until prism beam specimen generation fatigure failure is with the comprehensive fatigue effect of combined reaction weather conditions and vehicular load.
Claims (2)
1. a Permafrost Area asphalt Frozen-thawed cycled fatigue test method, is characterized in that, comprise the steps:
Step 1, foundation Bitumen Mix Design, milling process is taken turns according to T0703-2011 in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, manufactured size is the asphalt plate test specimen of 400mm × 300mm × 50mm, asphalt plate test specimen is cut into the prism beam specimen of 381mm × 63.5mm × 50mm;
Under step 2, room temperature, prism beam specimen is put into tank, water logging there is not prism beam specimen, the tank that prism beam specimen is housed is placed in vacuum drying chamber, 15min under 97.3kpa vacuum tightness, make vacuum drying chamber recover atmospheric pressure state afterwards, and make prism beam specimen continue immersion 1h, complete prism beam specimen and to satisfy water;
Step 3, the prism beam specimen of full water to be taken out from tank, with the closely knit parcel of preservative film, put into rustless steel container, the rustless steel container that prism beam specimen is housed is put into constant temperature refrigerator, and freezing 4h at-18 DEG C, takes out prism beam specimen afterwards from rustless steel container, at room temperature put into tank to soak 30min, after prism beam specimen taken out from tank and preservative film torn, melt more than 4h, complete the Frozen-thawed cycled of prism beam specimen;
Step 4, by the prism beam specimen after freeze thawing according to T0739-2011 asphalt four-point bending fatigue life test in " highway engineering pitch and Asphalt Mixture Experiment code " JTGE20-2011, carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, sets N number of loaded cycle, record test parameters and test findings;
Wherein, N number of loaded cycle is determined as follows: by the prism beam specimen of step 1, without freeze thawing, directly carry out three branch loading fatigue tests, adopt semisinusoidal strain controlling pattern, loading frequency 10Hz, test temperature 15 DEG C, strain level 400 μ ε, until the fatigure failure of prism beam specimen, obtain the fatigue loading cycles total degree of prism beam specimen, get total degree 1/10th are N;
Step 5, the prism beam specimen that loaded is repeated the Frozen-thawed cycled torture test of step 2 to step 4, until test specimen fatigure failure.
2. Permafrost Area according to claim 1 asphalt Frozen-thawed cycled fatigue test method, is characterized in that, the inside dimension of rustless steel container described in step 3 is 385mm × 65mm × 50mm.
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| CN104951608B (en) * | 2015-06-19 | 2018-04-03 | 长安大学 | A kind of evaluation of actual environment unfreezing intensity and quantization method |
| CN108195693A (en) * | 2017-12-11 | 2018-06-22 | 山西省交通科学研究院 | A kind of evaluation method of low temperature performance of asphalt |
| CN113933188B (en) * | 2021-10-14 | 2023-07-07 | 北京建筑大学 | Test method for freeze thawing fatigue performance of building rubbish recycled aggregate asphalt concrete |
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| CN101571466B (en) * | 2009-06-15 | 2011-02-02 | 哈尔滨工业大学 | Indoor small size load testing method for asphalt mixture |
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