Company Introduction Founded by the professors and experts from Xi’an Highway University in 1978, specialized in supplying theintegrated solutions of asphalt pavement maintenance techniques and equipments. Having the largest and most professional asphalt equipments research, design and manufacture base inChina. 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 building The Largest Asphalt Equipments Base in China
Integrated Solution of Asphalt Pavement Construction & Maintenance Techniques and Equipments 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
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 becomesludgy in rainy day as shown in following pictures.In order to solve the problems mentioned above and improve all-weather trafficcapacity of the gravel and earth road with low cost and high efficiency, it isrecommend 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 asphaltbinder in the form of an emulsion or hot spray or sometimes cutback followed by adouble application of an aggregate as close to uniform-size as possible. Intelligent Asphalt Distributor Chip Spreader Tire RollerDBST is better applicable to a road with medium or low-traffic volume (<4000 ADT-Average Daily Traffic) .
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 absolutelyessential for a successful DBST, which can accurately control the spraying/spreading amountand uniformity of asphalt binder and aggregate.
Synchronous Chip Sealer (synchronously spraying asphalt binder and spreading aggregate onone 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 bytwo and thus reduce emissions of green-house gases.
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 100% 100% 5 to 8 years Approx. 1.5 km/day (4cm) DBST (around 1.5 Approx. 50% Approx. 50% 5 to 8 years Approx. 10km/day cm)
Construction Case: Double Chip Seal Project Double Chip Seal Project (Best combination for big chip seal project)
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 surfacetreatments and operations intended to retard progressive failures and reduce the need for routinemaintenance and service activities.Trough researches to the maintenance costs and efficiency, it was indicated that doing 3-4 time ofpreventive maintenance works during the service life of a pavement will prolong its service lifefor 10-15 years, and 45%-50% maintenance cost will be saved. Road Service Road Service Performance Performance Road Service Life Road Service Life
II-2: LOW-TRAFFICE-VOLUME ASPHALT PAVEMENT PREVENTIVEMAINTENANCEFor the low-traffic-volume asphalt pavement(as shown on pictures below), it is recommended touse the quick and low-cost seal coat for preventive maintenance.Seal coat has the same construction procedures, materials and equipments with the double chip sealbesides the seal coat is single-layer structure and the double chip seal is a double-layer structure.
II-3: HEAVY-TRAFFIC-VOLUME ASPHALT PAVEMENT PREVENTIVEMAINTENANCEFor the heavy-traffic-volume road (as shown on pictures below), it is recommended to use the quickand 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-gradedaggregate, polymer-modified asphalt emulsion, water, mineral fillers and additives.Micro surfacing is made and applied to existing pavements by a specialist machine-Micro SurfacingPaver, which carries all components, mixes them on site, and spreads the mixture onto the road surface.
Part IV.Asphalt Pavement Rehabilitation Techniques and Equipments
Rehabilitation is mainly applied to the pavement which has a majority of area tooccur structurally damages and it needs milling or recycling in certain depth and re-overlay. Cold In-Place Recycling (CIR) is a perfect pavement rehabilitationtechniques 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 oldaggregates and asphalt materials, as well as improving road strength and grade.
Part V.Asphalt Materials HandlingTechniques 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 EquipmentAn Asphalt Emulsion consists of asphalt particles dispersed in water and chemicallystabilized. Nowadays, (modified) asphalt emulsion is widely applied to the prime coat, tackcoat, 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 workers Pollution control.
V-4. Polymer Modified Asphalt Technique and EquipmentIncreasing traffic volumes, vehicle loads , tire pressures, high and low temperature are causingaccelerated road damage. Polymer Modified Asphalt is better combating these effects andgenerally considered to provide prolonged life or enhanced road performance.
V-5. Crumb Rubber Modified Asphalt (Asphalt Rubber) Techniques and EquipmentsAsphalt-rubber is a binder used in various types offlexible pavement construction including surfacetreatments and hot mixes. According to theASTM definition, asphalt-rubber is “ a blend ofasphalt cement, reclaimed tire rubber, and certainadditives in which the rubber component is atleast 15 percent by weight of the total blend andhas reacted in the hot asphalt cement sufficientlyto cause swelling of the rubber particles”.
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 dueAsphalt Rubber Mixing Unit 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 Reaction Tank
Asphalt Rubber Chip Seal Overlay (after 8 years use ）Asphalt Rubber Chip Seal Overlay (after 6 yearsuse ）
The Asphalt Rubber concrete friction course not appeared reflection cracks after 8 years use The conventional asphalt concrete friction course appeared reflection cracks after 8 years use