CN102305849B - 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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- CN102305849B CN102305849B CN201110146425.XA CN201110146425A CN102305849B CN 102305849 B CN102305849 B CN 102305849B CN 201110146425 A CN201110146425 A CN 201110146425A CN 102305849 B CN102305849 B CN 102305849B
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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 the evaluation method of the asphalt structure type based on road surface core.
Background technology
The structure type of asphalt is divided into matrix type and floating type.Wherein framework type asphalt mixture comprises: stone matrix asphalt mixture SMA, drainage type Asphalt Stabilized Macadam compound ATPB, macropore open gradation drainage type asphalt wearing layer OGFC etc.Structure type is remarkable to the performance impact of compound.
In existing < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004) " technical requirement of table 5.3.3-3 SMA compound Marshall Test mix-design ", require coarse aggregate skeleton voidage VCA
mixbe not more than VCA
dRC, also the structure type of compound has been proposed to requirement.But, in this standard " table 11.5.1-1 highway hot-mixed bitumen pavement is handed over and checked and acceptable quality level " without above-mentioned to coarse aggregate skeleton voidage VCA
mixtechnical requirement, also without the acceptance criteria to mixture structure type.Therefore, the variability of the compound that the operation such as this acceptance criteria can not reflect pavement spread, roll causes, can not reflect bituminous pavement after construction and the accordance of technical requirement on design, is difficult to Asphalt Pavement Construction Quality comprehensively to be evaluated.
Summary of the invention
The invention provides a kind of evaluation method of the asphalt structure type based on road surface core, to evaluate the rear asphalt structure type of construction.
Object of the present invention is achieved by the following technical programs:
(1) drill through asphalt pavement core sample, measure core height
Adopt the method for existing < < highway subgrade road surface on-the-spot test rules > > (JTG E60-2008) T0901, after asphalt pavement construction 3 days, with drilling machine, drill through the core of Mixture for Asphalt Pavement structural sheet, core diameter is 20cm, drilling depth should surpass this layer of compound thickness 1cm, and by core, the faying face along different structure layer cuts with cutting machine, core is dried to constant weight, measure core height H
mix.
(2) burning core, obtains the coarse aggregate of particle diameter more than 4.75mm
Core is positioned in the baking oven of 110 ℃～150 ℃ and heats and within 2 hours～3 hours, become loose shape core, again loose shape core is put into asphalt dedicated combustion furnace, temperature of combustion is 450 ° of C～550 ° C, burn when extremely within continuous 2 minutes, core quality per minute loss percentage is less than 0.01%, stop burning; After core is cooling, screen out mineral aggregate and combustion residue that particle diameter is less than 4.75mm; Get the coarse aggregate of residue particle diameter more than 4.75mm, for moulding sample.
(3) the real method moulding of dry-tamping sample, and measure specimen height
The coarse aggregate of the particle diameter that (2) step is tailed over more than 4.75mm is disposable to be packed in the capacity tube that internal diameter is 20cm; With diameter, be that 16mm, length are 600mm, one end rod iron that is round end by the even tamping in edge to 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) evaluate the structure type of asphalt
< < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004) requires the coarse aggregate skeleton voidage VCA of stone matrix asphalt mixture SMA
mixbe less than or equal to the coarse aggregate pine dress clearance rate VCA under tamping state
dRC, should meet 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, on formula (1) both sides, adds coarse aggregate volume V simultaneously
c, become formula (2):
VCA
mix+ V
C≤VCA
DRC+ V
C （2）
And VCA
mix+ V
c=V
mix; VCA
dRC+ V
c=V
dRC.
Wherein, V
mixvolume for compound; V
dRCvolume for the real method moulding of dry-tamping sample.
By formula (2), obtained: 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
mixbe less than or equal to the height H of the real method moulding of dry-tamping sample
dRCtime, compound belongs to matrix type structure; When road surface core height H
mixbe greater than the height H of the real method moulding of dry-tamping sample
dRCtime, compound belongs to floating type structure.
Compared with prior art, the present invention has the following advantages:
(1) bituminous pavement the present invention is directed to after construction is evaluated, and can reflect the variability of pavement construction process, has made up the deficiency of existing standard, is convenient to the accordance of the construction quality of bituminous pavement and designing requirement to test;
(2) the present invention, by drilling through asphalt pavement core sample, evaluates the rear structure type of asphalt of construction and the accordance of designing requirement, and evaluation means is simple, easily realizes, and 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 road surface core diameter, by the height of duplicate and core, evaluates the structure type of the asphalt after construction.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but be not limited to this.
detection and the evaluation of example 1 AC-20C asphalt structure type
Certain asphalt pavement of highway is 3 layered structures, and wherein, middle surface layer is AC-20C type asphalt, constructs after 3 days, checks the structure type of compound according to following steps:
(1) drill through asphalt pavement core sample, measure core height
Adopt the method for existing < < highway subgrade road surface on-the-spot test rules > > (JTG E60-2008) T0901, with drilling machine, drill through the core of the middle surface layer of bituminous pavement, core diameter is 20cm, drilling depth surpasses this layer of compound thickness 2cm, and by core, the faying face along lower surface layer cuts with cutting machine, core is dried to constant weight, measure core height H
mixfor 6.12cm.
(2) burning core, obtains the coarse aggregate of particle diameter more than 4.75mm
Core is placed in 110 ℃ of baking ovens and heated 3 hours, to loose condition (of surface); Again loose core is put into asphalt dedicated combustion furnace, temperature of combustion is set in to 450 ° of C, burn when extremely within continuous 2 minutes, core quality per minute loss percentage is 0.0081% (being less than 0.01%), stop burning.
After core is 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, for moulding sample.
(3) with the real method moulding of dry-tamping sample, measure specimen height
Pack in the capacity tube that internal diameter is 20cm the coarse aggregate of (2) step particle diameter more than 4.75mm is disposable; With diameter, be that 16 mm, length are the rod iron that 600 mm, one end are round end, by limit in evenly tamping 75 times.After leveling the gathering materials of specimen surface, with vernier caliper, measure the specimen height H of the real moulding of dry-tamping
dRCfor 5.25cm.
(4) evaluate the structure type of asphalt
Due to road surface core height H
mixbe greater than the height H of the real method moulding of dry-tamping sample
dRC, this asphalt belongs to floating type structure.
detection and the evaluation of example 2 SMA-16 asphalt structure types
Certain asphalt pavement of highway is 3 layered structures, and wherein, upper layer is SMA-16 type asphalt, constructs after 3 days, checks the structure type of compound according to following steps:
(1) drill through road surface core, measure core height
Adopt the method for existing < < highway subgrade road surface on-the-spot test rules > > (JTG E60-2008) T0901, with drilling machine, drill through the core of the upper layer of bituminous pavement, core diameter is 20cm, drilling depth surpasses this layer of compound thickness 1cm, and with cutting machine, the faying face of surface layer in core edge is cut.
Core is dried to constant weight, measure core height H
mixfor 5.06cm.
(2) burning core, obtains the coarse aggregate of particle diameter more than 4.75mm
Core is placed in 150 ℃ of baking ovens and heated 2 hours, to loose condition (of surface).Again loose core is put into asphalt dedicated combustion furnace, temperature of combustion is set in to 550 ° of C, burn when extremely within continuous 2 minutes, core quality per minute loss percentage is 0.0092% (being less than 0.01%), stop burning.
After core is 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, for moulding sample.
(3) with the real method moulding of dry-tamping sample, measure specimen height
Pack in the capacity tube that internal diameter is 20cm the coarse aggregate of (2) step particle diameter more than 4.75mm is disposable; With diameter, be the rod iron that 16 mm, long 600 mm, one end are round end, by limit in evenly tamping 75 times, after the gathering materials of leveling specimen surface, with vernier caliper, measure the height H of the real method moulding of dry-tamping sample
dRCfor 5.13cm.
(4) evaluate the structure type of asphalt:
Due to road surface core height H
mixbe less than the height H of the real method moulding of dry-tamping sample
dRC, this asphalt belongs to matrix type structure.
Claims (1)
1. the evaluation method of the asphalt structure type based on road surface core, is characterized in that, concrete steps are as follows:
(1) mensuration of asphalt pavement core sample height, detailed process is: asphalt pavement construction is after 3 days, with drilling machine, drill through the core of Mixture for Asphalt Pavement structural sheet, core diameter is 20cm, drilling depth should surpass the compound thickness 1cm of Mixture for Asphalt Pavement structural sheet, and the faying face along different structure layer cuts by core with cutting machine, and core is dried to constant weight, measure core height H
mix;
(2) burning road surface core, obtain coarse aggregate, detailed process is: core is positioned in the baking oven of 110 ℃～150 ℃ and heats and within 2 hours～3 hours, become loose shape core, again loose shape core is put into asphalt dedicated combustion furnace, temperature of combustion is 450 ° of C～550 ° C, burn when extremely within continuous 2 minutes, core quality per minute loss percentage is less than 0.01%, stop burning; After core is cooling, screens out particle diameter and be less than mineral aggregate and the combustion residue below 4.75mm; Get the coarse aggregate of residue particle diameter more than 4.75mm, for moulding sample;
(3) mensuration of the real method moulding sample of dry-tamping and specimen height: pack in the capacity tube that internal diameter is 20cm step (2) gained coarse aggregate is disposable; With diameter, be that 16mm, length are 600mm, one end rod iron that is round end by the even tamping in edge to middle part of capacity tube 75 times; After leveling the gathering materials of specimen surface, measure specimen height;
(4) evaluation of asphalt structure type: compare road surface core height and specimen height, obtain asphalt material structure type: when road surface core height is less than or equal to specimen height, asphalt material belongs to matrix type structure; When road surface core height is greater than specimen height, asphalt material belongs to floating type structure.
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| CN102928324B (en) * | 2012-10-23 | 2014-12-31 | 华南理工大学 | Method for testing water permeability inside asphalt pavement after drilling |
| CN103308448B (en) * | 2013-05-30 | 2015-05-06 | 河海大学 | Method for rapidly judging structure type of asphalt concrete |
| 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 |
| 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 |
| CN111155404B (en) * | 2020-01-21 | 2021-10-19 | 中铁四局集团有限公司 | Double-layer drainage asphalt pavement quality detection method |
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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》.2008,第6,7页. * |
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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 |