西安达刚路面机械股份有限公司XI’AN DAGANG ROAD MACHINERY CO. LTD.
Integrated Solutions of Asphalt Pavement Maintenance Techniques and Equipments
Tel: 0086 29 88327462 E-mail: [email protected] Website: www.xadagang.cn www.dgroadmachinery.com
Company Introduction
Founded by the professors and experts from Xi’an Highway University in 1978, specialized in supplying the
integrated solutions of asphalt pavement maintenance techniques and equipments.
Having the largest and most professional asphalt equipments research, design and manufacture base in
China.
Drafting the industrial standard of the asphalt heating and spraying equipments in China.
The only one listed-company in asphalt heating and spraying industry in China (Stock Code: 300103).
Office buildingOffice building The Largest Asphalt Equipments Base in ChinaThe Largest Asphalt Equipments Base in China
I. Gravel Road or Earth Road Fast and Cost-effective Surfacing and Equipments
II. Asphalt Pavement Preventive Maintenance Techniques and Equipments
III. Common Asphalt Pavement Distresses Treatment Techniques and Equipments
IV. Asphalt Pavement Rehabilitation Techniques and Equipments
V. Asphalt Materials Handling Techniques and Equipments
Integrated Solution of Asphalt Pavement Construction & Maintenance Techniques and Equipments
Part I.
Gravel Road or Earth Road Fast and Cost-effective Surfacing and Equipments
The gravel road and earth road usually have much dust in sunny day and become sludgy in rainy day as shown in following pictures. In order to solve the problems mentioned above and improve all-weather traffic capacity of the gravel and earth road with low cost and high efficiency, it is recommend the following surfacing treatment: Double Bituminous Surface Treatment(DBST) or Double Chip Seal.
WHAT IS DBST:
Double Bituminous Surface Treatment (DBST) is a double application of asphalt binder in the form of an emulsion or hot spray or sometimes cutback followed by a double application of an aggregate as close to uniform-size as possible.
DBST is better applicable to a road with medium or low-traffic volume (<4000 ADT-Average Daily Traffic) .
Intelligent Asphalt Distributor Chip Spreader Tire Roller
Main Materials:
(Modified) Asphalt Emulsion or Asphalt Rubber (recommended)Aggregate (Chips)
Correct Asphalt Emulsion Binder Clean and Single-size Aggregate
Main Equipments:
Computer-control Asphalt Distributor (spraying prime coat and binding coat)
Computer-control Chip Spreader (spreading chips/aggregate)
The high-performance Computer-control Asphalt Distributor and Chip Spreader is absolutely essential for a successful DBST, which can accurately control the spraying/spreading amount and uniformity of asphalt binder and aggregate.
Synchronous Chip Sealer (synchronously spraying asphalt binder and spreading aggregate on one machine. It is a combination of Asphalt Distributor and Chip Spreader ).
Advantages of Synchronous Chip Sealing: Simultaneous spraying ensuring a perfect cohesion between the binder/chips The time between the spraying on the binder and the chips is constant This two in one machine makes it possible to use one less truck The reduction of the number of trucks on a work site makes it possible to divide the consumed energy by two and thus reduce emissions of green-house gases.
Strict Construction Procedures:
Correct equipments selected + Correct Materials + Strictly construction procedure control = Successful Chip Seal and Great Benefits
DBST Asphalt Pavement
DBST Vs. Asphalt Concrete
Equipment Cost Construction Cost Service Life Construction Period
Asphalt Concrete(4cm)
100% 100% 5 to 8 years Approx. 1.5 km/day
DBST (around 1.5 cm)
Approx. 50% Approx. 50% 5 to 8 years Approx. 10km/day
Double Chip Seal Project
Construction Case:
Double Chip Seal Project(Best combination for big chip seal
project)
Synchronous DBST Project
(Australia)Synchronous DBST Project
(Ghana)
Construction Case:
Part II.
Asphalt Pavement Preventive Maintenance Techniques and Equipments
II-1: WHAT IS PREVENTIVE MAINTENANCE:
It is performed to improve or extend the functional life of a pavement. It is a strategy of surface
treatments and operations intended to retard progressive failures and reduce the need for routine
maintenance and service activities.
Trough researches to the maintenance costs and efficiency, it was indicated that doing 3-4 time of
preventive maintenance works during the service life of a pavement will prolong its service life
for 10-15 years, and 45%-50% maintenance cost will be saved.
Road Service Performance
Road Service Life
Road Service Performance
Road Service Life
II-2: LOW-TRAFFICE-VOLUME ASPHALT PAVEMENT PREVENTIVE MAINTENANCE
For the low-traffic-volume asphalt pavement(as shown on pictures below), it is recommended to use the quick and low-cost seal coat for preventive maintenance.
Seal coat has the same construction procedures, materials and equipments with the double chip seal besides the seal coat is single-layer structure and the double chip seal is a double-layer structure.
Seal Coat Preventive Maintenance
II-3: HEAVY-TRAFFIC-VOLUME ASPHALT PAVEMENT PREVENTIVE MAINTENANCEFor the heavy-traffic-volume road (as shown on pictures below), it is recommended to use the quick and cost-effective Micro Surfacing for preventive maintenance.
What is Micro-Surfacing:
Micro surfacing is a polymer-modified cold-mix paving system and begins as a mixture of dense-graded aggregate, polymer-modified asphalt emulsion, water, mineral fillers and additives.
Micro surfacing is made and applied to existing pavements by a specialist machine-Micro Surfacing Paver, which carries all components, mixes them on site, and spreads the mixture onto the road surface.
Micro Surfacing Paver
Highway Preventive Maintenance (Project in China)
Re-Open to traffic within around 60 minutes.
Urban Road Preventive Maintenance (Project in India)
One lane working, one lane keeping traffic
Part III.
Common Asphalt Pavement Distresses Treatment Techniques and Equipments
III-1. Cracking Treatment Techniques
Fatigue cracking/ Alligator CrackingFatigue cracking/ Alligator Cracking
Treatment Techniques: Localized patching Chip seal or seal coat Mill and overlay
Transverse CrackingTransverse Cracking
Treatment Techniques:Crack sealing or Crack fillingLocalized patchingFull-depth crack repairChip seal or seal coat
III-1. Cracking Treatment Techniques
Block CrackingBlock Cracking
Treatment Techniques:Crack sealing or Crack fillingLocalized patchingChip seal or seal coat Thin hot-mix overlay
Edge CrackingEdge Cracking
Treatment Techniques:Crack sealing or Crack fillingLocalized patching
III-1. Cracking Treatment Techniques
Longitudinal CrackingLongitudinal Cracking
Treatment Techniques:Crack sealing or Crack fillingLocalized patchingFull-depth crack repair
Slippage CrackingSlippage Cracking
Treatment Techniques:Localized patching
III-2. Surface Deformation Treatment Techniques
RuttingRutting
Treatment Techniques:Localized patching Micro SurfacingThin hot-mix overlay
Shoving and CorrugationShoving and Corrugation
Treatment Techniques:Localized patchingMilling and Overlay
III-3. Surface Defects Treatment Techniques
BleedingBleeding
Treatment Techniques: Seal coat or Double chip seal Slurry seal Micro Surfacing Thin hot-mix overlay
Polished AggregatePolished Aggregate
Treatment Techniques: Seal coat or Double chip seal Slurry seal Micro Surfacing Thin hot-mix overlay
III-3. Surface Defects Treatment Techniques
Treatment Techniques:
Localized patchingFog sealSeal coat or Double chip sealSlurry sealMicro SurfacingThin hot-mix overlay RavelingRaveling
III-4. Patching and Potholes Treatment Techniques
Patch DeteriorationPatch Deterioration
Treatment Techniques:
Re-patching
PotholesPotholes
Treatment Techniques:
Patching
III-5. Distresses Treatment Equipments
Crack sealing or Crack filling Equipments
Cracks after filling
Asphalt Pavement Distresses Patching Equipments
The equipment can patch the following distresses: Cracking Shoving and Corrugation Raveling PotholesPatch Deterioration
Asphalt Pavement Distresses Patching Jobsite
Removing the damaged layer
Cleaning
Filling New Hot Mix
Compaction
Rutting Repairing – Micro Surfacing Paver
Part IV.
Asphalt Pavement Rehabilitation Techniques and Equipments
Rehabilitation is mainly applied to the pavement which has a majority of area to occur structurally damages and it needs milling or recycling in certain depth and re-overlay. Cold In-Place Recycling (CIR) is a perfect pavement rehabilitation techniques for asphalt pavement that does not require heat while recycling the in-place material. CIR can reduce the road life cycle cost by reusing the old aggregates and asphalt materials, as well as improving road strength and grade.
Cold In-place Recycling
Cold In-place Recycler
Part V.
Asphalt Materials Handling
Techniques and Equipments
V-1. Drummed asphalt decanting and heating Techniques and Equipments
V-2. Hot Asphalt Transporting and Heat-preserving Techniques and Equipments
Equipped with automatic heating system and loading/unloading system.
V-3. Asphalt Emulsion Technique and Equipment
An Asphalt Emulsion consists of asphalt particles dispersed in water and chemically stabilized. Nowadays, (modified) asphalt emulsion is widely applied to the prime coat, tack coat, chip sealing, slurry seal, micro surfacing, cold recycling, etc.
Asphalt emulsion has some obvious advantages:Can be applied/sprayed at normal temperature.No extra heating required.Safety for workersPollution control.
V-4. Polymer Modified Asphalt Technique and Equipment
Increasing traffic volumes, vehicle loads , tire pressures, high and low temperature are causing accelerated road damage. Polymer Modified Asphalt is better combating these effects and generally considered to provide prolonged life or enhanced road performance.
V-5. Crumb Rubber Modified Asphalt (Asphalt Rubber) Techniques and Equipments
Asphalt-rubber is a binder used in various types of flexible pavement construction including surface treatments and hot mixes. According to the ASTM definition, asphalt-rubber is “ a blend of asphalt cement, reclaimed tire rubber, and certain additives in which the rubber component is at least 15 percent by weight of the total blend and has reacted in the hot asphalt cement sufficiently to cause swelling of the rubber particles”.
Asphalt Rubber Mixing Unit
Asphalt Rubber Reaction Tank
Main Benefits of Asphalt Rubber Paving Materials:Extended pavement service life for 5-10 years and lower pavement maintenance costs. Reduced traffic noise, ranging from 3 to 8 db.Reduced splash, spray, and hydroplaning during and immediately after rains and thus improves safety.Improved resistance to rutting (permanent deformation) due to higher viscosity, softening points and resilience. Improved resistance to fatigue/reflection cracking due to higher binder contents and elasticity.Improved resistance to aging and oxidation due to higher binder contents, thicker binder films, and anti-oxidants in the tire rubber. Better chip retention in chip seals due to thick binder films. Savings in energy and natural resources by using waste products.
Asphalt Rubber Chip Seal Overlay (after 6 years usAsphalt Rubber Chip Seal Overlay (after 6 years usee))
Asphalt Rubber Chip Seal Overlay (after 8 years usAsphalt Rubber Chip Seal Overlay (after 8 years usee))
The Asphalt Rubber concrete friction course not appeared The Asphalt Rubber concrete friction course not appeared reflection cracks after 8 years use reflection cracks after 8 years use
The conventional asphalt concrete friction course The conventional asphalt concrete friction course appeared reflection cracks after 8 years useappeared reflection cracks after 8 years use
Traffic noise reductionTraffic noise reduction
Reduced splash, spray, and hydroplaning during and after rainsReduced splash, spray, and hydroplaning during and after rains
Until now, our asphalt pavement techniques and equipments have been serving in 46 countries.
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