Maintenance technology of colored asphalt concrete pavement
Release time:
2020-02-03
The research and application of colored asphalt concrete pavement began in European and American countries in the 1950s.This kind of pavement not only can better coordinate with the architectural art around the road,
The research and application of colored asphalt concrete pavement began in European and American countries in the 1950s.This kind of pavement not only can better coordinate with the architectural art around the road,but also can beautify the city and induce traffic,reflecting a country Or the characteristics and style of the city can enhance the image and function of the entire city,showing the style and charm of a modern city.China's research on colored asphalt concrete pavement began in the early 1980s,but its application on roads is still rare.In recent years,it has been used more and more as a new type of paving technology in highways,roads or squares.
Colored asphalt concrete pavement is made by mixing decolorized asphalt with various colored stones,pigments and additives at a specific temperature to prepare various colored asphalt mixtures,and then paving and rolling to form a certain strength and Road performance of colored asphalt concrete pavement.Colored asphalt concrete pavement mainly includes 4 types of hot-mix colored asphalt concrete pavement,warm-mix colored asphalt concrete pavement,cold-mix colored asphalt concrete pavement,and colored asphalt concrete impression pavement.Colored asphalt concrete pavement is mainly used for urban main roads,expressways,ring roads,traffic indication areas,crosswalks,traffic deceleration zones,bicycle lanes,sidewalks,bridge deck paving,platforms,car parking lots,stadiums,factories,hospitals and other enterprises.Division of functional areas of public institutions,airports,docks,stations and other leisure and beautification areas.
At present,the maintenance of colored asphalt concrete pavement is still a weak link.Many units have built colored asphalt concrete pavement but do not know how to maintain it,what maintenance technology and materials to choose,and when to maintain it.In view of the industry's lack of knowledge on color asphalt concrete pavement maintenance,this article introduces the maintenance technology,materials and maintenance timing of color asphalt concrete pavement.
Colored asphalt concrete pavement maintenance material
In recent years,with the rapid development of color asphalt concrete pavement in China,the market demand for color asphalt concrete pavement maintenance is increasing.Domestic colored asphalt manufacturers,colored pavement construction units and professional maintenance units have successively developed colored asphalt concrete pavement maintenance materials and put forward corresponding technical requirements.
Color pavement protector
Colored pavement protective agent can improve the performance of colored asphalt concrete pavement,prevent light aging,water melting,and increase the corrosion resistance and wear resistance of colored asphalt concrete pavement.Before the construction is completed and open to traffic,a layer of protective agent should be added to the surface of the colored pavement;during the use period of the colored asphalt concrete pavement,the colored pavement protective agent should be sprayed regularly to strengthen the maintenance of the colored asphalt pavement.
Color fog seal material color
color fog seal material can improve the performance of colored asphalt concrete pavement,increase the waterproof capacity of the pavement,and restore the color of colored asphalt concrete pavement.During the service life of the colored asphalt concrete pavement,when the color is degraded by light,aging,etc.,the color fog seal layer can be used to restore the pavement color.The color mist seal layer material should have good permeability.
color potting glue
Color joint filling glue should have strong bonding ability,no water seepage,good elasticity,no flow at high temperature,no sticking to the wheel,no brittleness at low temperature,good durability,and not easy to fade under long-term sunlight.
Artificial colored ceramsite
Ceramsite is ceramic particles,which are generally made of shale,clay rock,etc.,which are crushed,sieved,and sintered at high temperatures.The shape of the ceramsite is different due to different processes.Generally,it is spherical or ellipsoidal.The artificial colored ceramsite for color pavement is irregularly crushed.The surface of the ceramsite is a hard shell,which is made of ceramic or enamel,which has a water barrier function and gives the ceramsite high strength.The appearance color of the ceramsite varies with the different materials and processes used.The color of the fired ceramsite is mostly dark red and ocher red.The artificial colored ceramsite can be colored in many colors according to the color of the road.
Artificial colored ceramsites should be used as coarse aggregates to choose products with single particle size,uniform particles and close to cubes,uniform coloring,and colors close to the road design color.When artificial colored ceramsite is used as a fine aggregate,products with uniform particles,uniform coloring,and colors close to the road design color should be selected.
Color Asphalt Concrete Pavement Maintenance Technology and Selection
Color asphalt concrete pavement maintenance plan selection
Preventive maintenance.The preventive maintenance of colored asphalt concrete pavement includes pavement cleaning,pavement protection and pavement color restoration.Color asphalt concrete pavement cleaning is divided into daily cleaning and regular cleaning:daily cleaning should be carried out at any time after the road is polluted;regular cleaning should be no less than once a month,and special road cleaning machinery should be used.The colored asphalt concrete pavement shall be protected by spraying colored pavement protective agent.The first pavement protection shall be carried out after the pavement is paved before the traffic is opened,and every two years thereafter.
Disease corrective maintenance.(1)Corrective maintenance should be carried out for the cracks,potholes,water permeability,and insufficient anti-skid performance of the colored asphalt concrete pavement.The selection of the disease corrective maintenance plan should comply with the following principles:cracks should be repaired by cracks;potholes should be repaired;water-permeable diseases should be treated with colored fog seals;the anti-skid performance of motor vehicles should be insufficient.Adopt the scheme of increasing the color anti-skid wear layer;for the color asphalt concrete pavement with serious disease and large area,it is advisable to adopt the scheme of color micro-surface repair.
(2)For the damage and disease of the coating of the colored asphalt concrete indented pavement,the coating repair method should be used to deal with the indentation damage and disease should be treated by the indentation repair method.
Color anti-slip wear layer
The colored anti-skid wear layer is a thin layer of colored pavement formed by first painting one-component or two-component colored paint,and then sprinkling colored aggregate(or artificial colored ceramsite).The colored anti-skid wear layer can be used for the maintenance of colored asphalt concrete pavement,or as a separate colored pavement structure layer.The colored anti-skid wear layer is a new type of colored pavement structure,commonly known as"color anti-skid pavement".
At present,there is a new type of colored anti-skid wear layer-polymer cement mortar colored thin layer,referred to as colored sand pavement.The traditional colored anti-skid wear layer aggregate has a large particle size,and generally uses artificial colored ceramsite,which is relatively expensive;while the aggregate used in colored sand pavement is sand,which reduces the thickness,so the cost is low.The principle of the colored thin layer of polymer cement mortar is:formulating water emulsion sand glue according to a certain formula to form polymer particles of a multi-phase structure model.Through the design of different ratios of soft and hard phase components,a variety of road performances can be obtained.The required final product,of which the core technology product is modified polymer emulsion CWC.The construction process of colored sand pavement is as follows:The modified polymer emulsion CWC is mixed with water,cement and pigments in a certain proportion to form a quick-drying and strong hydraulic polymer cement binder,which is sprayed directly on Cement,stone,steel,asphalt pavement and other surfaces form a new repair surface or colorful surface layer.
color micro-surface office
The colored micro-surface is made of appropriately graded aggregates,fillers(cement,lime,fly ash,mineral powder,etc.)mixed with colored emulsified asphalt,pigments,admixtures and water in a certain proportion to form a colored slurry mixture.Then use special machinery to spread it evenly on the road surface to form a colored asphalt seal.The colored micro-surface can be used for the maintenance of colored asphalt concrete pavement.
The color micro-surface is developed from the ordinary micro-surface,and it is different from the ordinary micro-surface in two points:one is that the ordinary micro-surface uses modified emulsified asphalt,and the color micro-surface uses colored emulsified asphalt;the other is the color micro-surface.The surface mixture is mixed with pigments.
At present,the color micro-surface treatment technology is relatively mature.For roads with a relatively low design age,the color micro-surface treatment can be used to replace the colored asphalt concrete pavement.Compared with the colored asphalt concrete pavement,the colored micro-surface has a price advantage.The color micro-surface has the following characteristics:good high temperature stability;the use of colored emulsified asphalt makes the binder and the aggregate have strong adhesion;the colored aggregate has high abrasion resistance;the gradation and raw materials can be adjusted,The noise is reduced by more than 20%compared to the ordinary micro-surface;the construction is less affected by the temperature,the construction speed is fast,and the forming is fast,which shortens the time of opening traffic;reduces energy consumption,no harmful gas emissions,and meets environmental protection requirements.
The design service life of the color micrometer should be 6 years,and the surface should be smooth,dense,uniform,without looseness,anti-skid and durable.
color asphalt concrete indentation pavement maintenance construction technology
colored asphalt concrete impression pavement
The color asphalt concrete impression pavement is developed from the foreign SP pavement,and consists of two processes:indentation and painting.According to the actual situation,the colored asphalt concrete indentation pavement can be extended into three types of pavement structures:only indentation is performed on the colored asphalt concrete pavement without painting,and the indentation is bordered to present a three-dimensional effect;only on the colored asphalt concrete pavement Paint the pavement without indentation,that is,painted pavement;Indentation and painting on ordinary asphalt concrete pavement,or only one of indentation and painting.The third structure is not as effective as indentation and painting on the colored asphalt concrete pavement,but it saves costs and can be considered when the funds are insufficient.
coating repair
The construction process of coating repair is:delineate the repair surface;use a spatula or a knife to remove the loose surface coating along the contour line of the repair surface,and the treated periphery should be hard and strong without loosening;use a hair dryer to remove the residue in the groove Clean up the sundries and loose materials;place the template,and apply the color coating evenly on the repair surface by spraying,rolling or scraping.The thickness and color of the new coating should be the same as the original coating;after drying and forming Open traffic.
Indentation repair
The construction process of indentation repair is:delineate the repair surface;use a spatula or a knife to remove the loose surface coating along the outline of the repair surface;use a spatula to remove the original color of the indentation along the outline of the repair surface The loose part of the pavement is removed,excavated to form a pothole,and the colored patch is used to repair the pothole according to the specification;after the indentation is filled,the mold consistent with the original indentation is placed on the repaired and soft road,such as the road surface The hardened should be heated to 90°C~120°C and positioned according to the staked baseline;use a vibrating rammer to press the positioned mold into the repaired colored asphalt concrete surface,and then remove the mold;use brushing to apply the colored paint Spread evenly on the repair surface,the color and thickness of the new coating should be consistent with the original coating;open to traffic after drying and forming.
Conclusion
(1)The maintenance of colored asphalt concrete pavement is still a weak link.Many units have built colored asphalt concrete pavement but do not know how to maintain it,what maintenance technology and materials to choose,and when to maintain it.
(2)Colored asphalt concrete pavement maintenance materials are a new research direction and have broad market prospects.
(3)The maintenance technology of colored asphalt concrete pavement changes with each passing day,and is constantly improving and developing.
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