CN102305849A - Method for evaluating structure type of bituminous mixture based on pavement core sample - Google Patents
Method for evaluating structure type of bituminous mixture based on pavement core sample Download PDFInfo
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- CN102305849A CN102305849A CN201110146425A CN201110146425A CN102305849A CN 102305849 A CN102305849 A CN 102305849A CN 201110146425 A CN201110146425 A CN 201110146425A CN 201110146425 A CN201110146425 A CN 201110146425A CN 102305849 A CN102305849 A CN 102305849A
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Abstract
The invention discloses a method for evaluating a structure type of a bituminous mixture based on a pavement core sample. The method comprises the following specific steps of: determining the height of the bituminous pavement core sample; combusting the pavement core sample to obtain coarse aggregate; modeling the sample by a dry tamp method and determining the height of the sample; modeling sample of the coarse aggregate by the dry tamp method, wherein the diameter of the sample is the same as that of the pavement core sample; and evaluating the structure type of the bituminous mixture, wherein when the height of the pavement core sample is less than or equal to that of the sample, the bituminous mixture has a skeleton structure; and when the height of the pavement core sample is more than that of the sample, the bituminous mixture has a suspension structure. After the pavement construction is finished, the structure type of the bituminous mixture is evaluated through core sampling, so the defects of the conventional specification are made up, the construction quality and the design conformity of the bituminous pavement can be inspected conveniently, the construction quality of a pavement can be controlled conveniently and the service life of the pavement is prolonged.
Description
Technical field
The present invention relates to the detection technique of performance of asphalt mixture, be specifically related to evaluation method based on the asphalt structure type of road surface core.
Background technology
The structure type of asphalt is divided into matrix type and floating type.Wherein framework type asphalt mixture comprises: pitch horse's hoofs fat crushed stones compound SMA, drainage type pitch stabilization gravel compound ATPB, macropore open gradation drainage type asphalt wearing layer OGFC etc.Structure type is remarkable to the performance impact of compound.
Require coarse aggregate skeleton voidage VCA in existing " asphalt highway construction technique normalizing " (JTG F40-2004) " table 5.3.3-3 SMA compound Marshall Test match ratio technical requirement on design "
MixBe not more than VCA
DRC, also promptly requirement has been proposed for the structure type of compound.But, no above-mentioned in this standard " table 11.5.1-1 highway hot-mixed bitumen pavement is handed over and checked and acceptable quality level " to coarse aggregate skeleton voidage VCA
MixTechnical requirement, also be the acceptance criteria of unmatchful mixture structure type.Therefore, the variability of the compound that operation such as this acceptance criteria can not reflect pavement spread, roll causes can not reflect bituminous pavement and the accordance of technical requirement on design after the construction, is difficult to the asphalt pavement construction quality is comprehensively estimated.
Summary of the invention
The present invention provides a kind of evaluation method of the asphalt structure type based on the road surface core, to estimate construction back asphalt structure type.
The object of the invention is achieved through following technical scheme:
(1) drills through asphalt pavement core sample, measure the core height
Adopt the method for existing " highway subgrade road surface on-the-spot test rules " (JTG E60-2008) T0901; Behind the asphalt pavement construction 3 days, drill through the core of bituminous pavement asphalt structural sheet with drilling machine, core diameter is 20cm; Drilling depth should surpass this layer compound thickness 1cm; And with cutting machine the faying face of core along the different structure layer cut, core is dried to constant weight, measure the core height H
Mix
(2) the burning core obtains the coarse aggregate of particle diameter more than 4.75mm
Core is positioned over heating became loose shape core in 2 hours～3 hours in 110 ℃～150 ℃ the baking oven; Again loose shape core is put into the asphalt dedicated combustion furnace; Temperature of combustion is 450 ° of C～550 ° C; The burning to continuous 2 minutes core quality per minute loss percentages less than 0.01% o'clock, burn-out; After treating the core cooling, screen out mineral aggregate and the combustion residue of particle diameter less than 4.75mm; Get the coarse aggregate of residue particle diameter more than 4.75mm, be used for the moulding sample.
(3) the real method moulding of dry-tamping sample, and measure specimen height
The disposable internal diameter of packing into of the coarse aggregate of particle diameter more than 4.75mm that (2) step was tailed over is in the capacity tube of 20cm; Use diameter as 16mm, long as 600mm, an end as the rod iron of round end by the even tamping in edge to the middle part of capacity tube 75 times; After leveling the gathering materials of specimen surface, measure the specimen height H of the real moulding of dry-tamping
DRC
(4) structure type of Evaluation of asphalt mixture
" asphalt highway construction technique normalizing " (JTG F40-2004) requires the coarse aggregate skeleton voidage VCA of pitch horse's hoofs fat crushed stones compound SMA
MixSmaller or equal to the pine of the coarse aggregate under tamping state dress clearance rate VCA
DRC, promptly should satisfy the requirement of formula (1):
VCA≤VCA
DRC （1）
Formula (1) is acknowledged as the fundamental difference of matrix type and floating type mixture structure, adds coarse aggregate volume V simultaneously on formula (1) both sides
C, become formula (2):
VCA
mix+?V
C≤VCA
DRC+?V
C （2）
And VCA
Mix+ V
C=V
MixVCA
DRC+ V
C=V
DRC
Wherein, V
MixVolume for compound; V
DRCVolume for the real method moulding of dry-tamping sample.
Get by formula (2): V
Mix≤V
DRC
Because sample is identical with the diameter of core, therefore, formula (1) becomes H
Mix≤H
DRC
When road surface core height H
MixHeight H smaller or equal to the real method moulding of dry-tamping sample
DRCThe time, compound belongs to the matrix type structure; When road surface core height H
MixHeight H greater than the real method moulding of dry-tamping sample
DRCThe time, compound belongs to the floating type structure.
Compared with prior art, the present invention has the following advantages:
(1) bituminous pavement that the present invention is directed to after the construction is estimated, and can reflect the variability of pavement construction process, has remedied the deficiency of existing standard, is convenient to the construction quality of bituminous pavement and the accordance of designing requirement are tested;
(2) the present invention estimates the structure type of construction back asphalt and the accordance of designing requirement through drilling through asphalt pavement core sample, and evaluation means is simple, realizes that easily the road pavement damaged condition is little;
(3) the coarse aggregate moulding sample of the real method of dry-tamping of the present invention is identical with the road surface core diameter, through the height of duplicate and core, estimates the structure type of the asphalt after constructing.
Embodiment
Below in conjunction with embodiment the present invention is described further, but is not limited thereto.
The detection and the evaluation of instance 1 AC-20C asphalt structure type
Certain asphalt pavement of highway is 3 layered structures, and wherein, middle surface layer is an AC-20C type asphalt, constructs after 3 days, checks the structure type of compound according to following steps:
(1) drills through asphalt pavement core sample, measure the core height
Adopt the method for existing " highway subgrade road surface on-the-spot test rules " (JTG E60-2008) T0901; Drill through the core of the middle surface layer of bituminous pavement with drilling machine; Core diameter is 20cm, and drilling depth surpasses this layer compound thickness 2cm, and cuts with the faying face of cutting machine with surface layer under the core edge; Core is dried to constant weight, measure the core height H
MixBe 6.12cm.
(2) the burning core obtains the coarse aggregate of particle diameter more than 4.75mm
With heating in 110 ℃ of baking ovens of core placement 3 hours, to loose condition (of surface); Again loose core is put into the asphalt dedicated combustion furnace, temperature of combustion is set in 450 ° of C, burning to continuous 2 minutes core quality per minute loss percentages are 0.0081% o'clock (less than 0.01%), burn-out.
After treating the core cooling, screen out mineral aggregate and the combustion residue of particle diameter below 4.75mm, the coarse aggregate of residue particle diameter more than 4.75mm is used for the moulding sample.
(3) with the real method moulding of dry-tamping sample, measure specimen height
With the disposable internal diameter of packing into of (2) the step coarse aggregate of particle diameter more than 4.75mm is in the capacity tube of 20cm; Using diameter is that 16 mm, length are 600 mm, the end rod iron as round end, by the limit in evenly tamping 75 times.After leveling the gathering materials of specimen surface, measure the specimen height H of the real moulding of dry-tamping with vernier caliper
DRCBe 5.25cm.
(4) structure type of Evaluation of asphalt mixture
Because road surface core height H
MixHeight H greater than the real method moulding of dry-tamping sample
DRC, this asphalt belongs to the floating type structure.
The detection and the evaluation of instance 2 SMA-16 asphalt structure types
Certain asphalt pavement of highway is 3 layered structures, and wherein, upper layer is a SMA-16 type asphalt, constructs after 3 days, checks the structure type of compound according to following steps:
(1) drills through the road surface core, measure the core height
Adopt the method for existing " highway subgrade road surface on-the-spot test rules " (JTG E60-2008) T0901; Drill through the core of the upper layer of bituminous pavement with drilling machine; Core diameter is 20cm; Drilling depth surpasses this layer compound thickness 1cm, and cuts with the faying face of cutting machine with surface layer in the core edge.
Core is dried to constant weight, measure the core height H
MixBe 5.06cm.
(2) the burning core obtains the coarse aggregate of particle diameter more than 4.75mm
With heating in 150 ℃ of baking ovens of core placement 2 hours, to loose condition (of surface).Again loose core is put into the asphalt dedicated combustion furnace, temperature of combustion is set in 550 ° of C, burning to continuous 2 minutes core quality per minute loss percentages are 0.0092% o'clock (less than 0.01%), burn-out.
After treating the core cooling, screen out mineral aggregate and the combustion residue of particle diameter below 4.75mm, the coarse aggregate of residue particle diameter more than 4.75mm is used for the moulding sample.
(3) with the real method moulding of dry-tamping sample, measure specimen height
With the disposable internal diameter of packing into of (2) the step coarse aggregate of particle diameter more than 4.75mm is in the capacity tube of 20cm; Using diameter is 16 mm, long 600 mm, the end rod iron as round end, by the limit in evenly tamping 75 times, after the gathering materials of leveling specimen surface, measure the height H of the real method moulding of dry-tamping sample with vernier caliper
DRCBe 5.13cm.
(4) structure type of Evaluation of asphalt mixture:
Because road surface core height H
MixHeight H less than the real method moulding of dry-tamping sample
DRC, this asphalt belongs to the matrix type structure.
Claims (3)
1. based on the evaluation method of the asphalt structure type of road surface core, it is characterized in that concrete steps are following:
(1) mensuration of asphalt pavement core sample height;
(2) burning road surface core obtains coarse aggregate;
(3) mensuration of real method moulding sample of dry-tamping and specimen height: with the disposable internal diameter of packing into of step (2) gained coarse aggregate is in the capacity tube of 20cm; Use diameter as 16mm, long as 600mm, an end as the rod iron of round end by the even tamping in edge to the middle part of capacity tube 75 times; After leveling the gathering materials of specimen surface, measure specimen height;
(4) evaluation of asphalt structure type: relatively road surface core height and specimen height obtain pitch material structure type: when road surface core height during smaller or equal to specimen height, the pitch material belongs to the matrix type structure; When road surface core height during greater than specimen height, the pitch material belongs to the floating type structure.
2. the evaluation method of the asphalt structure type based on the road surface core according to claim 1 is characterized in that said step (1) detailed process is: asphalt pavement construction is after 3 days; Drill through the core of bituminous pavement asphalt structural sheet with drilling machine; Core diameter is 20cm, and drilling depth should surpass this layer compound thickness 1cm, and with cutting machine the faying face of core along the different structure layer is cut; Core is dried to constant weight, measure the core height H
Mix
3. the evaluation method of the asphalt structure type based on the road surface core according to claim 2; It is characterized in that; Said step (2) detailed process is: core is positioned over heating became loose shape core in 2 hours～3 hours in 110 ℃～150 ℃ the baking oven, looser shape core is put into the asphalt dedicated combustion furnace, temperature of combustion is 450 ° of C～550 ° C; The burning to continuous 2 minutes core quality per minute loss percentages less than 0.01% o'clock, burn-out; After treating the core cooling, screen out particle diameter less than mineral aggregate below the 4.75mm and combustion residue; Get the coarse aggregate of residue particle diameter more than 4.75mm, be used for the moulding sample.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928324A (en) * | 2012-10-23 | 2013-02-13 | 华南理工大学 | Method for testing water permeability inside asphalt pavement after drilling |
| CN103308448A (en) * | 2013-05-30 | 2013-09-18 | 河海大学 | Method for rapidly judging structure type of asphalt concrete |
| CN103487369A (en) * | 2013-09-18 | 2014-01-01 | 华南理工大学 | Method for determination of inorganic binder stabilized aggregate mixture structure type |
| CN106447690A (en) * | 2016-09-30 | 2017-02-22 | 南京航空航天大学 | Coarse aggregation characteristic method for emulsified asphalt cold-recycled mixture |
| CN111155404A (en) * | 2020-01-21 | 2020-05-15 | 中铁四局集团有限公司 | Double-layer drainage asphalt pavement quality detection method |
-
2011
- 2011-06-02 CN CN201110146425.XA patent/CN102305849B/en active Active
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| 中华人民共和国交通运输部: "公路路基路面现场测试规程", 《中华人民共和国行业标准JTG E60-2008》 * |
| 中华人民共和国交通部: "公路沥青路面施工技术规范", 《中华人民共和国行业标准JTG F40-2004》 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928324A (en) * | 2012-10-23 | 2013-02-13 | 华南理工大学 | Method for testing water permeability inside asphalt pavement after drilling |
| CN102928324B (en) * | 2012-10-23 | 2014-12-31 | 华南理工大学 | Method for testing water permeability inside asphalt pavement after drilling |
| CN103308448A (en) * | 2013-05-30 | 2013-09-18 | 河海大学 | Method for rapidly judging structure type of asphalt concrete |
| CN103308448B (en) * | 2013-05-30 | 2015-05-06 | 河海大学 | Method for rapidly judging structure type of asphalt concrete |
| CN103487369A (en) * | 2013-09-18 | 2014-01-01 | 华南理工大学 | Method for determination of inorganic binder stabilized aggregate mixture structure type |
| CN103487369B (en) * | 2013-09-18 | 2015-08-26 | 华南理工大学 | Stabilized with inorganic binder is gathered materials the assay method of class mixture structure type |
| CN106447690A (en) * | 2016-09-30 | 2017-02-22 | 南京航空航天大学 | Coarse aggregation characteristic method for emulsified asphalt cold-recycled mixture |
| CN106447690B (en) * | 2016-09-30 | 2018-11-20 | 南京航空航天大学 | The coarse aggregate characteristic analysis method of Cold Recycled Mixture with Emulsified Asphalt |
| CN111155404A (en) * | 2020-01-21 | 2020-05-15 | 中铁四局集团有限公司 | Double-layer drainage asphalt pavement quality detection method |
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|---|---|
| CN102305849B (en) | 2014-11-12 |
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Effective date of registration: 20160331 Address after: 510065, No. 9, Heping Road, Guangdong, Guangzhou, two, Yuexiu District Patentee after: Guangdong elephant Traffic Technology Co., Ltd. Address before: 510640 five mountain road, Guangzhou, Guangdong, Tianhe District 381 Patentee before: South China University of Technology |