CN102980798A - Method for testing retained strength of bituminous pavement milling and planing material - Google Patents
Method for testing retained strength of bituminous pavement milling and planing material Download PDFInfo
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- CN102980798A CN102980798A CN2012104887513A CN201210488751A CN102980798A CN 102980798 A CN102980798 A CN 102980798A CN 2012104887513 A CN2012104887513 A CN 2012104887513A CN 201210488751 A CN201210488751 A CN 201210488751A CN 102980798 A CN102980798 A CN 102980798A
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Abstract
The invention provides a method for testing the retained strength of an asphalt pavement milling and planing material. The method comprises the following steps of: step 1, preparing cement mortar according to the condition that the mass ratio of water to cement to sand is equal to 1:2:3; step 2, according to the condition that four mass ratios of the cement mortar to RAP is equal to 100:0, 70:30, 60:40 and 50:50, manufacturing marshall test pieces, wherein the marshall test piece of each mass ratio forms at least four parallel test pieces; step 3, respectively carrying out splitting test on the marshall test pieces of different mass ratios, and obtaining the cleavage strength; and step 4, on the basis of taking the adulteration proportion of the cement mortar as x value and the cleavage strength of the test pieces with different water-cement-sand doping ratios as Y value, carrying out linear regression, and obtaining formula y=a*x+b, wherein a is a regression slope factor, b is a regression altitude intercept, and b is the retained strength of the straight asphalt pavement milling and planing material (RAP) which is not doped with cement mortar. The method provided by the invention can be used for effectively solving the problem that the retained strength of the current recycled asphalt pavement milling and planing material can not be exactly evaluated, thereby providing powerful reference for the accurate design of a regenerated asphalt mixtures.
Description
Technical field
The present invention is a kind of bituminous pavement milling material retained strength method of testing, retained strength that can accurate evaluation old asphalt pavement milling material (RAP), no longer simply with old asphalt pavement milling material (RAP) general as " black stone ", thereby can carry out more accurately the design of regenerating mixture, also significant for the structural design of reclaimed bituminous pavement.The invention belongs to the highway engineering technical field of measurement and test.
Background technology
Be accompanied by the most of bituminous pavement of China and enter successively big or middle repairing the phase, calculated according to 15 ~ 20 years bituminous pavement design life-spans, have national every year from now on 10% bituminous pavement to overhaul, the discarded amount of annual old brea bed will reach 2,000,000 tons.Recycling these of regeneration techniques dig, the old material of milling if adopt, can save 3.5 hundred million yuan of Master Costs every year, and this numeral also will increase with annual 15% speed, estimate China in 2015 on business the waste asphalt mixture RAP that produces of road transformation will reach 1,000 ten thousand tons, it is carried out regeneration can produce 1,500,000,000 yuan direct economic benefit.Simultaneously, the environmental benefit of generation is also very remarkable.
Reclaim asphalt pavement material (RAP) as the main material source of pavement recycling, very few to the research of its retained strength both at home and abroad, generally RAP is regarded as during the compound design " black stone ", be used as the general usefulness of gathering materials to come, the detection of RAP performance mainly concentrated on grating and the bitumen content aspect of RAP.When the regulation road pavement is carried out cold regeneration among China JTG F41-2008 " asphalt highway regeneration techniques standard ", survey RAP water percentage, grating, bitumen content and three norms, and the crush values of gathering materials and corner angle etc., and these actual measurement projects are little to the performance impact of regenerating mixture, and are also nonsensical to the structural design of regenerated road surface.
In the laboratory, find that by a large amount of cold regeneration tests there is certain higher limit in 15 ℃ of cleavage strengths of cold regeneration mix, little with relations such as Asphalt emulsion content, emulsified asphalt kind, RAP volume, cement consumptions.Because old material derives from the milling material on former road surface, although it is broken to have passed through milling, still there is a large amount of pitch in the old material and gathers materials, the cluster of grains in the old material particularly, its internal state remains by pitch and plays cementation.So still keeping the residual strength that partly derives from old pavement in old material, the size of this part intensity and formation characteristics directly affect the mixture performance after the regeneration, therefore are necessary to carry out deep research.
Summary of the invention
Technical matters:When the objective of the invention is to solve existing Design for Regeneration old asphalt pavement is milled Bao material RAP performance evaluation deficiency, be used as merely common problem of gathering materials, a kind of bituminous pavement milling material retained strength method of testing is provided, thereby accurate evaluation RAP intensity, and then can carry out more accurately Mixture Design of Recycled Pitch.
Technical scheme:For solving the problems of the technologies described above, the technical solution used in the present invention is:
The mass ratio configuration sand-cement slurry of step 1: press water: cement: sand=1:2:3;
Step 2: according to sand-cement slurry: RAP=100:0,70:30,60:40,50:50 four kinds of quality ratio, make marshal piece, the marshal piece of every kind of quality ratio is four parallel test specimens of moulding at least;
Step 3: the marshal piece to the different quality ratio carries out respectively diametral compression test, obtains cleavage strength;
Step 4: take the mix ratio of sand-cement slurry as
xValue, take the cleavage strength of the test specimen of different sand-cement slurry mix ratios as
yValue is carried out linear regression, obtains formula
Y=a*x+b, wherein
aBe the regression slope coefficient,
bBe the recurrence intercept,
bBe the not retained strength of the unfilled bitumen road-surface milling material (RAP) of admixture sand-cement slurry.
The marshal piece of step 2 is Φ 101.6mm * 63.5mm cylinder specimen, make and adopt the moulding of vibrating, at first at room temperature health of shaping test piece 48 hours, the moist maintenance of sprinkling water at set intervals, health demoulding after 48 hours is placed on the concrete curing agent chamber and continues maintenance 72 hours after the demoulding.
The diametral compression test of step 3 is carried out according to the Indirect Tensile Tests of Asphalt Mixtures (T0715-2011) of " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011), and test temperature adopts 15 ℃ ± 0.5 ℃, and loading speed is 50mm/min.
Beneficial effect:A kind of bituminous pavement milling material retained strength method of testing provided by the invention, retained strength that can accurate evaluation bituminous pavement milling material RAP, thus so that the design of reclaimed asphalt mixture is more accurate.The sand-cement slurry ratio 1:2:3 that this method is selected, to choose according to general engineering experience, behind verification experimental verification, have good result of use, in specific implementation process, can do certain adjustment to the sand-cement slurry ratio according to actual conditions, and by its effect of verification experimental verification.This method has been selected the mass ratio of four kinds of sand-cement slurry and RAP, for enough data point formation mass ratioes and the correlationship between the cleavage strength are arranged, thereby the retained strength that can Extrapolation goes out RAP, in specific implementation process, can select sand-cement slurry and RAP ratio more than four kinds according to actual conditions, but should not be less than four kinds.
Description of drawings
Fig. 1 isThe cleavage strength of the test specimen of different sand-cement slurry mix ratios
yValue with mix ratio is
xThe linear regression graph of value.
Embodiment
The concrete scheme that the present invention adopts is: press water: cement: the mass ratio configuration sand-cement slurry of sand=1:2:3; According to sand-cement slurry: RAP=100:0,70:30,60:40,50:50 four kinds of quality ratio, make marshal piece, marshal piece is Φ 101.6mm * 63.5mm cylinder specimen, make and adopt the moulding of vibrating, shaping test piece is health 48h at first at room temperature, the moist maintenance of sprinkling water at set intervals, the demoulding behind the health 48h, be placed on the concrete curing agent chamber after the demoulding and continue maintenance 72h, the marshal piece of every kind of quality ratio is four parallel test specimens of moulding at least; Marshal piece to the different quality ratio carries out respectively diametral compression test, obtain cleavage strength, diametral compression test is carried out according to the Indirect Tensile Tests of Asphalt Mixtures (T0715-2011) of " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG E20-2011), test temperature adopts 15 ℃ ± 0.5 ℃, and loading speed is 50mm/min; Take the mix ratio of sand-cement slurry as
xValue, take the cleavage strength of the test specimen of different sand-cement slurry mix ratios as
yValue is carried out linear regression, obtains formula
Y=a*x+b, wherein
aBe the regression slope coefficient,
bBe the recurrence intercept,
bBe the not retained strength of the unfilled bitumen road-surface milling material (RAP) of admixture sand-cement slurry.
Application example: according to pressing water: cement: sand=1:2:3 proportional arrangement sand-cement slurry, get enough old asphalt pavement milling materials (RAP), with sand-cement slurry according to the four kinds of quality ratio, sand-cement slurry: RAP=100:0,70:30,60:40,50:50 make marshal piece, test specimen vibrate moulding, at room temperature health 48h, the moist maintenance of sprinkling water at set intervals, after the demoulding, be placed on concrete curing agent chamber maintenance 72h, then adopt diametral compression test to test the intensity of different test specimens.As shown in Figure 1, take the mix ratio of sand-cement slurry as
xValue, take the cleavage strength of the test specimen of different sand-cement slurry mix ratios as
yValue is carried out linear regression, obtains formula
Y=0.0234
X+0.6925, just mean that the retained strength that does not have the bituminous pavement of admixture sand-cement slurry milling material (RAP) is 0.6925MPa.
Claims (3)
1. bituminous pavement milling material retained strength method of testing is characterized in that may further comprise the steps:
The mass ratio configuration sand-cement slurry of step 1: press water: cement: sand=1:2:3;
Step 2: according to sand-cement slurry: RAP=100:0,70:30,60:40,50:50 four kinds of quality ratio, make marshal piece, the marshal piece of every kind of quality ratio is four parallel test specimens of moulding at least;
Step 3: the marshal piece to the different quality ratio carries out respectively diametral compression test, obtains cleavage strength;
Step 4: take the mix ratio of sand-cement slurry as
xValue, take the cleavage strength of the test specimen of different sand-cement slurry mix ratios as
yValue is carried out linear regression, obtains formula
Y=a*x+b, wherein
aBe the regression slope coefficient,
bBe the recurrence intercept,
bBe the not retained strength of the unfilled bitumen road-surface milling material of admixture sand-cement slurry.
2. a kind of bituminous pavement milling material retained strength method of testing as claimed in claim 1, it is characterized in that, the marshal piece of step 2 is Φ 101 ± 2.0mm * 63 ± 2.0mm cylinder specimen, make and adopt the moulding of vibrating, at first at room temperature health of shaping test piece 48 hours, the moist maintenance of sprinkling water at set intervals, health demoulding after 48 hours is placed on the concrete curing agent chamber and continues maintenance 72 hours after the demoulding.
3. a kind of bituminous pavement milling material retained strength method of testing as claimed in claim 1, it is characterized in that, the diametral compression test of step 3 is carried out according to the Indirect Tensile Tests of Asphalt Mixtures of highway engineering pitch and Asphalt Mixture Experiment rules-JTG E20-2011, test temperature adopts 15 ℃ ± 0.5 ℃, and loading speed is 50mm/min.
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| CN2012104887513A CN102980798A (en) | 2012-11-27 | 2012-11-27 | Method for testing retained strength of bituminous pavement milling and planing material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758732A (en) * | 2016-03-24 | 2016-07-13 | 北京盛广拓公路科技有限公司 | Core sample strength testing method for cold recycling site |
| CN109709095A (en) * | 2018-12-31 | 2019-05-03 | 山西省交通科学研究院 | A kind of Cement Stable Macadam Mixture fast health-promotion gradation interlocking condition evaluation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728181A1 (en) * | 1977-06-23 | 1979-01-04 | Karl Prof Dipl Ing Listner | Marshall method test specimens of bituminous materials - uniformly consolidated in manner to correspond to actual service conditions |
| CN101526519A (en) * | 2009-03-02 | 2009-09-09 | 深圳市市政工程总公司 | Test method of performance of asphalt mixture after crushing coarse aggregates |
-
2012
- 2012-11-27 CN CN2012104887513A patent/CN102980798A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728181A1 (en) * | 1977-06-23 | 1979-01-04 | Karl Prof Dipl Ing Listner | Marshall method test specimens of bituminous materials - uniformly consolidated in manner to correspond to actual service conditions |
| CN101526519A (en) * | 2009-03-02 | 2009-09-09 | 深圳市市政工程总公司 | Test method of performance of asphalt mixture after crushing coarse aggregates |
Non-Patent Citations (3)
| Title |
|---|
| A.HUSSAIN 等: "RAP对再生沥青混合料马歇尔指标的影响", 《重庆交通大学学报（自然科学版）》, vol. 31, no. 1, 30 June 2012 (2012-06-30), pages 724 - 728 * |
| 交通运输公路科学研究院: "《中华人民共和国行业标准 公路沥青及沥青混合料试验规程》", 14 September 2011, article "JTG E20-2011公路沥青及沥青混合料试验规程", pages: 253-257 * |
| 曾梦澜 等: "冷再生沥青混合料RAP含量对使用性能的影响", 《中南公路工程》, vol. 32, no. 2, 30 April 2007 (2007-04-30), pages 27 - 31 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758732A (en) * | 2016-03-24 | 2016-07-13 | 北京盛广拓公路科技有限公司 | Core sample strength testing method for cold recycling site |
| CN105758732B (en) * | 2016-03-24 | 2018-05-08 | 北京盛广拓公路科技有限公司 | A kind of cold renewal scene core sample Strength Testing Methods |
| CN109709095A (en) * | 2018-12-31 | 2019-05-03 | 山西省交通科学研究院 | A kind of Cement Stable Macadam Mixture fast health-promotion gradation interlocking condition evaluation method |
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Application publication date: 20130320 |