CN102417328A - Method for designing and evaluating dense-grading large stone asphalt mixture - Google Patents
Method for designing and evaluating dense-grading large stone asphalt mixture Download PDFInfo
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- CN102417328A CN102417328A CN2011102489521A CN201110248952A CN102417328A CN 102417328 A CN102417328 A CN 102417328A CN 2011102489521 A CN2011102489521 A CN 2011102489521A CN 201110248952 A CN201110248952 A CN 201110248952A CN 102417328 A CN102417328 A CN 102417328A
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Abstract
The invention relates to a method for designing and evaluating a dense-grading large stone asphalt mixture. In the method for designing and evaluating the performance of an LSAM (large stone asphalt mixture) structure, a key point for forming a squeezed compact structure is arranged according to the squeezing and filling characteristics of aggregate grading, and new volume design and separation-resistant design control indexes of a [CA'] ratio, a [FAc'] ratio and an [FAf'] ratio are proposed, and the optimal asphalt use amount is determined by combining with a Superpave level 1 volume design method. Mechanical design indexes CEI (Compaction Energy Index) and TDI (Traffic Densification Index) are introduced into to evaluate structural resistance, a dynamic modulus and a main curve thereof are introduced in to evaluate the high-temperature permanent deformation resistance performance of the LSAM, a low-temperature bending strain energy density is introduced in to evaluate the low-temperature crack resistance of the LSAM, and a site coring is introduced for a hamburg wheel tracking test to check the pavement performance of the LSAM after paving. According to the method, the problem of resisting tracks and fatigue for extra-heavy asphalt pavements can be solved, and the service life of the pavement is prolonged.
Description
Technical field
The invention belongs to highway engineering construction and maintenance technology field, be specifically related to a kind of close-graded LSAM design, evaluation method.
Background technology
Early stage rut, crack disease have mostly taken place in the motorway that China builds present stage; This no doubt be since economical increase fast the volume of traffic, the axle that bring carry increase considerably due to, but more reflect the problem of China's asphalt pavement of highway design, the general undercapacity of construction medium pitch compound.
Compare with the current asphalt that generally uses; LSAM LSAM has formed more stone-stone contact structures; Have bigger frictional force and embedding and squeeze power, can effectively alleviate the diseases such as rut, load fatigure failure, temperature fatigue destruction of bituminous pavement as the pavement structure middle layer.Yet LSAM should be designed to the performance requriements what structure just can reach pavement structure, and this problem does not have clear and definite guidance.China's " asphalt highway construction technique normalizing " (JTG F40-2004) only in the clause explanation grading limit to LSAM instruction is proposed; Big Marshall Test is adopted in design and evaluation for LSAM; Design objective adopts experimental stability and flow valuve; Source and the mechanism according to its superior structural drag does not propose mechanical properties prediction and pavement performance verification method, lacks the effective ways that instruct the LSAM design and estimate in the practice.
Summary of the invention
Technical problem to be solved by this invention provides a kind of close-graded LSAM design, evaluation method, and this method can solve anti-rut, the antifatigue problem that is applicable to the very heavy traffic road surface, prolongs service life of road surface.
Technical scheme of the present invention: a kind of close-graded LSAM design, evaluation method, it may further comprise the steps:
(1) confirms structure-functional design key point of LSAM and carry out volume design; The grating gradation composition of 0.075～37.5mm is gathered materials by function division group; The particle of particle diameter>=9.5mm is to form the effective size of grain that embedding is squeezed; Though particle diameter is to have certain embedding gathering materials of 4.75～9.5mm to squeeze ability, fails to form stable and the crowded structure of effective embedding; Gathering materials of particle diameter≤2.36mm mainly plays filling effect; The particulate fraction filling effect of particle diameter≤0.6mm is more remarkable, VMA, the asphalt content that can obtain to be fit to during maximum density " C " line of mineral compound＜2.36mm part graduation curve near maximum particle diameter the time;
(2) volume; Anti- segregation evaluating characteristics:
ratio;
ratio;
ratio
According to the calculated
ratio,
ratio,
volume compared LSAM characteristics were evaluated,
than the aggregate structural strength evaluation, segregation resistance and compaction;
ratio,
than the evaluation of <2.36mm part especially <0.6mm partial filling ;
(3) mechanical characteristics evaluation is introduced mechanics design objective CEI, TDI evaluation LSAM structure reactance, in the design moulding process of rotary compactor, estimates CEI: with N simultaneously
Ini=8 to the compaction log of degree of compactness 93% area; TDI: by degree of compactness 93% to design degree of compactness %N
Des(96%) closely knit TG-AUC the time;
(4) best asphalt content is confirmed, in conjunction with Superpave level 1 volume method of design, the index of integrated design voidage 4%, VMA11～13%, saturation ratio 64～75%, Ratio of filler bitumen 1～1.6 is judged optimum asphalt content;
(5) pavement performance evaluation; Estimate the LSAM Asphalt Mixture through high temperature dynamic modulus or dynamic modulus principal curve, low-temperature bending strain energy density, AASHTO T283, four-point bending stress fatigue number of times, respectively to high temperature permanent deformation resistance, the anti-ability of low temperature, anti-damage by water performance, anti-fatigue performance evaluation.
The present invention compared with prior art has following beneficial effect: LSAM structure-functional design, evaluation method have contained volume design, compactibility analysis, mechanical strength characteristics is selected and the pavement performance check; Both can require to make good evaluation and strengthen pavement performance to country, keypoint road engineering at the provincial and ministerial level and local road engineering different performance to asphalt; Also make the proportioning design process so not complicated; Mechanical strength evaluation and volume design are melted to together, are convenient to promote.This in addition LSAM structure-functional design, evaluation method also can be applicable to the Asphalt Mixture Design and the pavement performance evaluation of less nominal particle diameter.Be in detail:
1. proposition>=9.5mm can form the effective size of grain that embedding is squeezed, though and 4.75mm particle diameter particle has certain embedding and squeezes ability, fail to form stable and effectively embedding squeeze structure;≤2.36mm particle mainly plays filling effect; Particularly≤filling effect is remarkable especially for the 0.6mm particulate fraction, VMA, the asphalt content that can obtain to be fit to during maximum density " C " line of mineral compound＜2.36mm part graduation curve near maximum particle diameter the time.
2. propose the mineral compound and exist some grating key points, make it reach best embedding and squeeze and fill dense state.Noticeable change will take place in mixture structure near these key points; This discloses direct decision mixture performance is not compositing range but structure; When certain components contents changes in aggregate structure is formed; When as long as its rangeability also is not enough to have influence on the structure of compound, just can not produce obviously influence to the performance of compound.
The grating strategic point
New
ratio,
ratio,
are 3. proposed than evaluation volume characteristic and anti-segregation characteristic; Introducing CEI, TDI estimate mechanical characteristic when compound designs, and make volume design and mechanics design unified.
4. the high temperature permanent deformation resistance that proposes asphalt comes from formed mixture structure drag to a greater extent, and the effect of bituminous cements is taken second place, and introduces the high temperature permanent deformation resistance of dynamic modulus and principal curve Evaluation of asphalt mixture thereof.Introducing flexural strain can density Evaluation of asphalt mixture crack resistance at low-temperature.
Embodiment
Embodiment 1
LSAM is applied to surface layer making in the bituminous pavement.Certain expressway design is two-way Four-Lane Road, is the mountainous terrain motorway, and the extreme highest temperature is 39.8 ℃ over nearly 20 years, the extreme lowest temperature-19.5 ℃, and design accumulative total axle carries effect number of times=2.680 * 10
6Inferior/the per car road; The ratio that medium-and-large-sized lorry is formed in traffic accounts for 40%～50%; Estimate often to meet with traffic at a slow speed, the thick type of employing LSAM to strengthen high temperature permanent deformation resistance and anti-load fatigue capability, is selected the matrix pitch of PG 58-22 as the middle layer according to the volume of traffic, travel speed and temperature; Design thickness is 10cm, and the LSAM parameter of design is following:
LSAM proportioning design result
Formate gradation composition inspection parameter value
The asphalt pavement performance is analyzed
Remarks: KSI is a physical strength unit, the pressure that can bear on the representation unit area, 1KSI=1 kip/square inch=6.84MPa.
Compaction energy index CEI has reflected that compound is in the compactibility in paving process; Closely knit energy index TDI has reflected the close deformability of the resistance to compression of compound under traffic loading behind the open to traffic.
Embodiment 2
LSAM is applied to surface layer making in the bituminous pavement.Certain express highway pavement is transformed, and is designed to two-way Four-Lane Road, is the mountainous terrain motorway, and average slope is more than 4%, 43 ℃ of the extreme highest temperatures, the extreme lowest temperature-25.8 ℃.Design accumulative total axle carries effect number of times 5.66 * 10
8Inferior/the per car road; The ratio that medium-and-large-sized lorry is formed in traffic accounts for about 45%; Estimate often to meet with traffic at a slow speed, the thin type of employing LSAM to strengthen high temperature permanent deformation resistance and anti-load fatigue capability, is selected the modifying asphalt of PG 70-22 as the middle layer according to the volume of traffic, travel speed and temperature; Design thickness is 8cm, and the LSAM parameter of design is following:
LSAM proportioning design result
Formate gradation composition inspection parameter value
The asphalt pavement performance is analyzed
Remarks: KSI is a physical strength unit, the pressure that can bear on the representation unit area, 1KSI=1 kip/square inch=6.84MPa.
Embodiment 3
LSAM is applied to surface layer making in the bituminous pavement.Certain express highway pavement is designed to two-way Four-Lane Road, is the region of no relief motorway, 37.6 ℃ of the extreme highest temperatures, the extreme lowest temperature-28.6 ℃.Design accumulative total axle carries effect number of times 5.77 * 10
7Inferior/the per car road; The ratio that medium-and-large-sized lorry is formed in traffic accounts for about 40%; Estimate often to meet with traffic at a slow speed, the thin type conduct of employing LSAM surface layer is down selected the matrix pitch of PG 64-22 to strengthen high temperature permanent deformation resistance and anti-load fatigue capability according to the volume of traffic, travel speed and temperature; Design thickness is 8cm, and the LSAM parameter of design is following:
LSAM proportioning design result
Formate gradation composition inspection parameter value
The asphalt pavement performance is analyzed
Remarks: KSI is a physical strength unit, the pressure that can bear on the representation unit area, 1KSI=1 kip/square inch=6.84MPa.
Claims (1)
1. close-graded LSAM design, evaluation method, its characteristic may further comprise the steps:
Confirm the key point of LSAM structure-functional design and carry out the volume design that the gradation composition of 0.075～37.5mm is gathered materials divide group by function, the particle of particle diameter>=9.5mm is to form the effective size of grain that embedding is squeezed; Though particle diameter is to have certain embedding gathering materials of 4.75～9.5mm to squeeze ability, fails to form stable and the crowded structure of effective embedding; Gathering materials of particle diameter≤2.36mm mainly plays filling effect, and the particulate fraction filling effect of particle diameter≤0.6mm is more remarkable; VMA, the asphalt content that can obtain to be fit to during maximum density " C " line of mineral compound＜2.36mm part graduation curve the time near maximum particle diameter;
(2) volume; Anti- segregation evaluating characteristics:
ratio;
ratio;
ratio:
：≥1.8；
According to the calculated
ratio,
ratio,
volume compared LSAM characteristics were evaluated,
than the evaluation of the structural strength synthetic aggregates, and segregation resistance compaction;
,
rating <2.36mm part especially <0.6mm partial filling;
(3) mechanical characteristics evaluation is introduced mechanics design objective CEI, TDI evaluation structure drag, in the design moulding process of rotary compactor, estimates CEI: with N simultaneously
Ini=8 to the compaction log of degree of compactness 93% area; TDI: by degree of compactness 93% to design degree of compactness %N
Des(96%) closely knit TG-AUC the time;
(4) confirm best asphalt content, in conjunction with Superpave level 1 volume method of design, the index of integrated design voidage 4%, VMA11～13%, saturation ratio 64～75%, Ratio of filler bitumen 1～1.6 is judged optimum asphalt content;
(5) pavement performance evaluation; Estimate Asphalt Mixture through high temperature dynamic modulus or dynamic modulus principal curve, low-temperature bending strain energy density, AASHTO T283, four-point bending stress fatigue number of times, respectively to high temperature permanent deformation resistance, the anti-ability of low temperature, anti-damage by water performance, anti-fatigue performance evaluation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098294A (en) * | 2014-07-11 | 2014-10-15 | 沈阳建筑大学 | Method for determining optimal asphalt amount of large-particle-size asphalt mixture |
| CN104310859A (en) * | 2014-10-10 | 2015-01-28 | 北京市政路桥建材集团有限公司 | Method for determining optimal using amount of asphalt in high-viscosity high-elasticity stress dissipation material |
| CN104692712A (en) * | 2014-12-01 | 2015-06-10 | 北京市政路桥建材集团有限公司 | Method for designing performance balance of high-viscosity and high-elasticity stress dissipation material |
| CN106018762A (en) * | 2016-05-12 | 2016-10-12 | 华南理工大学 | Gradational segregation situation considered method for detecting asphalt content through laboratory test |
| CN106927730A (en) * | 2017-03-01 | 2017-07-07 | 河南中交路通工程监理咨询有限公司 | A kind of LSAM |
| CN113213814A (en) * | 2021-05-14 | 2021-08-06 | 河南中交路通工程监理咨询有限公司 | Preparation method of large-particle-size asphalt concrete |
| CN116040984A (en) * | 2021-10-28 | 2023-05-02 | 中国石油天然气股份有限公司 | Method for optimally designing material proportion based on anti-fatigue characteristic of asphalt mixture |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098294A (en) * | 2014-07-11 | 2014-10-15 | 沈阳建筑大学 | Method for determining optimal asphalt amount of large-particle-size asphalt mixture |
| CN104098294B (en) * | 2014-07-11 | 2016-10-26 | 沈阳建筑大学 | LSAM asphalt optimum content determines method |
| CN104310859A (en) * | 2014-10-10 | 2015-01-28 | 北京市政路桥建材集团有限公司 | Method for determining optimal using amount of asphalt in high-viscosity high-elasticity stress dissipation material |
| CN104310859B (en) * | 2014-10-10 | 2016-04-27 | 北京市政路桥建材集团有限公司 | The defining method of high glutinous high-elastic stress dissipation material medium pitch optimum amount |
| CN104692712A (en) * | 2014-12-01 | 2015-06-10 | 北京市政路桥建材集团有限公司 | Method for designing performance balance of high-viscosity and high-elasticity stress dissipation material |
| CN106018762A (en) * | 2016-05-12 | 2016-10-12 | 华南理工大学 | Gradational segregation situation considered method for detecting asphalt content through laboratory test |
| CN106018762B (en) * | 2016-05-12 | 2018-07-20 | 华南理工大学 | A method of considering testing inspection bitumen content in Gradation Segregation situation room |
| CN106927730A (en) * | 2017-03-01 | 2017-07-07 | 河南中交路通工程监理咨询有限公司 | A kind of LSAM |
| CN106927730B (en) * | 2017-03-01 | 2018-04-06 | 河南中交路通工程监理咨询有限公司 | A kind of LSAM |
| CN113213814A (en) * | 2021-05-14 | 2021-08-06 | 河南中交路通工程监理咨询有限公司 | Preparation method of large-particle-size asphalt concrete |
| CN116040984A (en) * | 2021-10-28 | 2023-05-02 | 中国石油天然气股份有限公司 | Method for optimally designing material proportion based on anti-fatigue characteristic of asphalt mixture |
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Application publication date: 20120418 |