I. concept of ultra thin color skid pavement pavement
1. Brief introduction of Technology:
On existing or newly paved asphalt pavement and cement pavement, a layer of flexible resin is evenly and thinly coated, and a layer of wear-resistant hard aggregate (coloring) or natural aggregate is dispersed on it, so as to fix the paving technology on the pavement.
The skid resistance coefficient and application objects of the skid resistant pavement determine different aggregate, particle size and technological process.
Usually, we choose special ceramic particles fired at 1000 degrees C as a hard and durable aggregate.
2. color antiskid pavement adhesive introduction:
Modified resin has certain toughness, high bonding strength and impact resistance, as well as weather resistance and chemical corrosion resistance.
Our company specially designs and improves adhesives according to the characteristics of asphaltene components or concrete, steel plate, climatic characteristics, construction progress requirements and application requirements used in our country at present. The adhesives are designed and improved to enhance the bonding strength and impact resistance, and have the following characteristics of road deformation and balance the various performance requirements. Department.
Two, application characteristics of color skid resistant pavement
Application place
1) Bus lanes (skid-proof and color effects) are prohibited from parking sections, and color zoning is more clearly used to improve driver's visual alertness.
2) durability and color effect of pavement.
3) intersection, bend, slope and other traffic accident prone areas.
4) Lane separation of carriageway.
5) speed limits on campus and shopping street and sidewalks along both sides of the road.
6) slow down section (zebra crossing).
7) sidewalks, bicycle lanes, parks and scenic spots.
8) ramp footpath, footbridge
Main effect
1) Ensuring traffic safety, arousing the attention of ordinary drivers, improving drivers'visual discrimination, and alleviating traffic congestion with obvious anti-skid effect.
2) skid resistance (rain and snow days)
3) flat pavement with a sense of toughness and comfort (using uniform ceramic aggregate).
4) color landscape effects (using colored aggregates)
5) color effect and foot feel are more comfortable than other hardened pavement.
Three. Characteristics of color skid resistant pavement
(1) high skid resistance, dry skid resistance coefficient BNP value 80~96, wet BNP value >70.
(2) high vision alertness, sub gloss effect improves visual comfort, slows down mental and visual fatigue.
(3) light color and color pattern design can improve the clarity of roads in tunnels or at night.
According to the above characteristics, anti-skid pavement is very suitable for traffic intersections, ramps, high-speed bends, and there is a big difference between the inside and outside of the tunnel.
EXAMPLE: In 2009, our company designed and paved skid-proof pavement in Longwangtan Tunnel and outside Guanyinshan Tunnel of West Han Expressway, which resulted in an average of about 5 traffic accidents per year due to slippery reasons, down to 0 in 2010.
(4) flexible modified resin materials are designed to withstand low temperature or high temperature deformation for different foundation designs.
(5) strong adhesion, suitable for common asphalt and cement pavement, and even adhesive on the surface of steel plate.
(6) the color ceramic aggregate is all in color, strong and tough, and stable in adhesion with resin.
(7) road surface is smooth and porous, reducing vehicle vibration and noise, reflecting and absorbing noise.
In March 2006, an example of color skid pavement on Shougang steel plate was carried out by Jiaotong University.
With 1.3t Santana car, the speed of 60km/ hours per hour stops on the skid Road, and the stopping distance is not large.
At 6m; crane hoisting at 25t, 40km/ hours per hour, stopping on the skid road and stopping distance.
No more than 6m; the surface of the anti-skid pavement is not falling off; the noise during running is less than that of other cement and steel.
Plate and coarse-grained asphalt pavement.
(8) it has a longer service life, and the service life of heavy traffic and heavy traffic is more than 5 years.
On the asphalt pavement paved on bus lines in Beijing and Xi'an, the peak of the day.
Every 1 minutes, a bus with a load of 20t or more has a daily traffic volume of more than 500 times.
On the asphalt pavement and concrete pavement of the Western Han Dynasty, freight cars usually load more than 70t.
The above sections have been used for anti slip pavement for 1~3 years.
(9) to protect and extend the service life of the foundation pavement.
To reduce the aging or corrosion of basic asphalt or cement pavement and steel plate. Because of the light color heat absorption on the surface and the "net cover" protection of the whole pavement, the common rutting phenomenon of asphalt pavement reduces the incidence relatively.
(10) fast construction, convenient maintenance and economy.
Because the hardening speed or process of colloid used in landscape color anti-skid pavement can be adjusted appropriately with season and pavement, traffic can be opened in the shortest time of 2-4 hours.
In addition, it can be constructed manually and quickly, which is suitable for long-distance and complex road operation and reduces the impact on the environment and order. Therefore, it has obvious advantages in comprehensive use and maintenance costs and social benefits.
Four, skid resistance principle of color skid resistant pavement
1. Rough surface increases the friction coefficient, mu=f/N, increases the surface area contacted with tire, and increases the friction force.
2. The irregularly arranged particles with uneven depth of more than 2 mm cause resistance to the moving object in the direction of motion, and effectively restrain the sliding in the direction of forward and sideslip when the vehicle is braked.
3. Water accumulated in rainy weather can flow rapidly laterally between particles under the rolling of tread groove. Sharp particles ensure effective contact with tires at multiple angles and increase the friction area.
4. For example, under the condition of winter rain in the south, the initial ice can be crushed quickly and difficult to assemble again under the rolling of the tread groove of the tire. The sharp particles ensure the effective contact surface with the tire. In addition, in this case, the use of conventional snow-melting agents, such as acid, alkali substances, good corrosion resistance of resin bonding layer has little effect. Therefore, a certain amount of snow melting agent can be used to enhance the anti icing effect under the condition of large snow cover.
Five, color anti-skid pavement construction process