CN103966958A - Asphalt-mixture-based energy dissipation decelerating spike - Google Patents

Abstract

The invention discloses an energy-dissipating road stud based on asphalt mixture. Its bottom surface is a circle with a diameter of 100-150mm, a height of 20-40mm, and the upper surface is arc-shaped; the asphalt mixture has a ratio of asphalt to 5% to 7%, of which polyester fiber accounts for 0.3-0.5wt%, and mineral powder accounts for 6%. ~12wt%; the asphalt used is one of SBS, SBR, EVA, PE modified asphalt; the diameter of polyester fiber is 15-50um, the length is 6-9mm, the tensile strength is greater than 500Mpa, and the melting point is greater than 250 ℃. The material used in the present invention not only does not affect the driving stability of the vehicle, but also the material used for the deceleration road stud is asphalt mixture, which has certain shapeability and flexibility. Prominent, the effect of forced speed control is remarkable.

Description

An asphalt mixture-based energy-dissipating road stud

technical field

The invention belongs to the field of material technology, and relates to a material technology for transportation facilities, in particular to an asphalt mixture-based energy-dissipating road stud.

Background technique

With the increase of vehicles and the acceleration of the pace of life of modern people, the problem of road traffic safety is becoming more and more serious. Therefore, in order to effectively control the speed of driving and reduce the rate of traffic accidents, it is often necessary to install some mandatory deceleration facilities on the road to limit driving. purpose of speed.

At present, the commonly used mandatory deceleration facilities are mainly speed bumps and vibration markings. The speed bumps include cast steel speed bumps and rubber speed bumps. The speed control effect of these two speed bumps is relatively obvious, but there are also certain problems. For example, the cost of cast steel speed bumps is high, and they will be pressed into the road after long-term use, and the deceleration effect is weakened. Not only is the durability of rubber speed bumps not strong , and the steel nails left behind after the destruction will cause damage to the vehicle tires. Vibrating markings have a significant speed control effect on small vehicles, but basically have no effect on large vehicles, especially large trucks. In addition to the above two most common deceleration measures, the current deceleration spike materials on expressways also include concrete and epoxy resin. Concrete deceleration road studs have the characteristics of high strength and not easy to deform. However, the flexibility of concrete road studs is poor, and the damage to driving tires and road surfaces is greater; epoxy resin-based road studs are more flexible, but not resistant to high temperatures, 50 It begins to soften and deform at about ℃, but the temperature of the highway surface at noon in summer can reach more than 60 ℃, and the epoxy resin-based road stud will be seriously deformed under the rolling of the vehicle and lose its deceleration effect. Therefore, it is very necessary to design a forced deceleration facility that can not only make the trolley run at a low speed, but also allow the large vehicle to pass at a low gear and low speed.

Contents of the invention

The purpose of the present invention is to relate to a speed reduction spike which is durable, has little threat to road surface and driving, and has good energy dissipation and deceleration effect on various vehicles and a preparation method thereof. The production and construction process is simple, the price is low, and it is easy to replace, and can be widely used in ordinary roads and high-grade roads.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

An energy-dissipating road stud based on asphalt mixture, the bottom surface of which is a circle with a diameter of 100-150mm, a height of 20-40mm, and an arc-shaped upper surface;

The asphalt mixture has an asphalt ratio of 5% to 7%, wherein polyester fibers account for 0.3 to 0.5 wt%, mineral powder accounts for 6 to 12 wt%, and the maximum particle size of the asphalt mixture aggregate is 9.5mm , the mass percentage of each level is: particle size less than 0.075mm accounts for 0-15%, 0.075-0.15mm accounts for 1-6%, 0.15-0.3mm accounts for 2-9%, 0.3-0.6mm 3-13% between 0.6-1.18mm, 4-18% between 0.6-1.18mm, 3-33% between 1.18-2.36mm, 25-75% between 2.36-4.75mm, 4.75- 9.5mm between 0-10%.

According to the above scheme, the asphalt used in the asphalt mixture is one of SBS, SBR, EVA, PE modified asphalt.

According to the above scheme, the diameter of the polyester fiber is 15-50um, the length is 6-9mm, the tensile strength is greater than 500Mpa, and the melting point is greater than 250°C.

According to the above scheme, the mineral powder is limestone mineral powder, which can pass through the sieve hole of 0.075mm.

According to the above scheme, the coarse aggregate in the asphalt mixture is one of basalt or diabase.

According to the scheme above, the fine aggregate in the asphalt mixture is limestone chips.

According to the above scheme, the upper surface of the road stud is sprayed with reflective material.

The installation of the present invention does not need drilling, and directly adopts high-performance adhesive for bonding. The road surface where pasted should be dry and clean, free from sand, water, grease and dirt. And blow it off with compressed air (and then brush it with acetone). The larger depression can be repaired and smoothed with road stud glue.

Compared with the prior art, the present invention has the following main advantages:

The asphalt mixture-based energy-dissipating road stud provided by the present invention not only gives the driver a strong sense of vibration, but also proves that the driver has a prominent visual effect and a remarkable effect of forced speed control.

The asphalt mixture-based energy-dissipating road stud provided by the present invention not only does not affect the driving stability of the vehicle, but also the material used in the road stud is asphalt mixture, which has certain plasticity and flexibility, and will not affect the safety of the vehicle. strength.

The asphalt mixture used in the asphalt mixture-based energy-dissipating road stud provided by the invention not only has high strength and good high temperature resistance, but also has a long service life.

The preparation method of the asphalt mixture-based energy-dissipating road stud provided by the invention is simple, low in cost, easy to install and replace, and does not cause damage to the road surface.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with examples, but the content of the present invention is not limited to the following examples.

The asphalt mixture-based energy-dissipating road stud of the present invention has a bottom surface of a circle with a diameter of 100-150 mm, a height of 20-40 mm, and an upper surface in the shape of an arc. The asphalt mixture has an asphalt ratio of 5% to 7%, of which polyester fiber accounts for 0.3~0.5wt%, mineral powder accounts for 6~12wt%, and the determined grading range is shown in the table below.

The material used in the deceleration road stud of the present invention is asphalt mixture, which has certain shapeability and flexibility, and will not affect the strength of the safety parts of the vehicle. Practice has proved that the driver not only has a strong sense of vibration, but also has outstanding visual effects, and the effect of forced speed control is remarkable. The preparation process is simple, the cost is low, the installation and replacement are easy, and the road surface will not be damaged.

The asphalt used in the asphalt mixture is one of SBS, SBR, EVA, PE modified asphalt.

The diameter of the polyester fiber used is 15-50um, the length is 6-9mm, the tensile strength is greater than 500Mpa, and the melting point is greater than 250°C.

The mineral powder used is limestone mineral powder, which can pass through the sieve hole of 0.075mm.

The coarse aggregate in the used asphalt mixture is one of basalt or diabase.

The fine aggregate used in the asphalt mixture is limestone chips.

The upper surface of the road stud is sprayed with reflective material. It can be hot melt marking material or reflective paint.

Example 1

Asphalt mixture-based energy dissipation speed studs are composed of the following raw materials:

62kg of asphalt, 890kg of aggregate (including coarse aggregate and fine aggregate), 3.717kg of polyester fiber, and 110kg of mineral powder. Among them, the asphalt is SBS modified asphalt, and the coarse aggregate is basalt. Table 1 is the sieve distribution calculation table of mineral materials.

Table 1

The preparation process of the asphalt mixture-based energy-dissipating road stud is as follows:

The above-mentioned weighed raw materials are fed in the order of coarse aggregate → fine aggregate → polyester fiber → asphalt → mineral powder, and then mixed according to the "Technical Specifications for Asphalt Pavement Construction" to obtain the asphalt mixture.

The above-mentioned asphalt mixture was then prepared in accordance with JTG E20-2011 "Experimental Specifications for Highway Asphalt and Asphalt Mixtures", and the two sides were compacted 50 times at a compaction temperature of 155°C. The Marshall test of the above-mentioned asphalt mixture was measured Performance porosity is 3.7%, Marshall stability is 13.7kN, flow value is 37.5mm, bitumen saturation is 78.0%.

The above-mentioned asphalt mixture was molded in a grinding tool, and both sides were compacted 25 times.

Spray reflective paint on the deceleration road studs after demoulding, put them in a constant temperature (20°C) environment for 24 hours of curing, and obtain an asphalt mixture-based energy dissipation deceleration with 1d compressive strength of 43.2MPa and fracture toughness of 2200J/ ^m2 Spike.

Example 2

Asphalt mixture-based energy dissipation speed studs are composed of the following raw materials:

67kg of asphalt, 880kg of aggregate (including coarse aggregate and fine aggregate), 4.268kg of polyester fiber, and 120kg of mineral powder. Among them, the asphalt is SBS modified asphalt, and the coarse aggregate is basalt. Table 2 is the sieve distribution calculation table of mineral materials.

Table 2

The preparation process of the asphalt mixture-based energy-dissipating road stud is as follows:

Add and mix the above-mentioned raw materials in the order of coarse aggregate → fine aggregate → polyester fiber → asphalt → mineral powder, and then mix according to the "Technical Specifications for Asphalt Pavement Construction" to obtain the asphalt mixture material.

The above-mentioned asphalt mixture was then prepared in accordance with JTG E20-2011 "Experimental Specifications for Highway Asphalt and Asphalt Mixtures", and the two sides were compacted 50 times at a compaction temperature of 155°C. The Marshall test of the above-mentioned asphalt mixture was measured Performance porosity is 3.2%, Marshall stability is 14.8kN, flow value is 48.7mm, bitumen saturation is 84.0%.

The above-mentioned asphalt mixture was molded in a grinding tool, and both sides were compacted 25 times.

Spray reflective paint on the deceleration road studs after demoulding, put them in a constant temperature (20°C) environment for 24 hours, and obtain an asphalt mixture-based energy dissipation deceleration with 1d compressive strength of 42.7MPa and fracture toughness of 2100J/ ^m2 Spike.

Example 3

Asphalt mixture-based energy dissipation speed studs are composed of the following raw materials:

65kg of asphalt, 900kg of aggregate (including coarse aggregate and fine aggregate), 4.047kg of polyester fiber, and 100kg of mineral powder. Among them, the asphalt is SBR modified asphalt, and the coarse aggregate is diabase. Table 3 is the sieve distribution calculation table of mineral materials.

table 3

The preparation process of the asphalt mixture-based energy-dissipating road stud is as follows:

The above-mentioned weighed raw materials are fed in the order of coarse aggregate → fine aggregate → polyester fiber → asphalt → mineral powder, and then mixed according to the "Technical Specifications for Asphalt Pavement Construction" to obtain the asphalt mixture.

The above-mentioned asphalt mixture was then prepared in accordance with JTG E20-2011 "Experimental Specifications for Highway Asphalt and Asphalt Mixtures", and the two sides were compacted 50 times at a compaction temperature of 155°C. The Marshall test of the above-mentioned asphalt mixture was measured Performance porosity is 3.4%, Marshall stability is 14.6kN, flow value is 43.2mm, bitumen saturation is 80.0%.

The above-mentioned asphalt mixture was molded in a grinding tool, and both sides were compacted 25 times.

Spray reflective paint on the deceleration road studs after demoulding, put them in a constant temperature (20°C) environment for 24 hours of curing, and obtain an asphalt mixture-based energy dissipation deceleration with 1d compressive strength of 41.4MPa and fracture toughness of 2140J/ ^m2 Spike.

Example 4

Asphalt mixture-based energy dissipation speed studs are composed of the following raw materials:

58kg of asphalt, 910kg of aggregate (including coarse aggregate and fine aggregate), 4.232kg of polyester fiber, and 90kg of mineral powder. Among them, the asphalt is SBR modified asphalt, and the coarse aggregate is basalt. Table 4 is the sieve distribution calculation table of mineral materials.

Table 4

The preparation process of the asphalt mixture-based energy-dissipating road stud is as follows:

The above-mentioned weighed raw materials are fed in the order of coarse aggregate → fine aggregate → polyester fiber → asphalt → mineral powder, and then mixed according to the "Technical Specifications for Asphalt Pavement Construction" to obtain the asphalt mixture.

The above asphalt mixture was then prepared in accordance with the "JTG E20-2011 Road Asphalt and Asphalt Mixture Experimental Specifications" to make a Marshall test piece, compacted 50 times on both sides, and the compaction temperature was 155°C. The Marshall test of the above asphalt mixture was measured Performance porosity is 3.8%, Marshall stability is 12.8kN, flow value is 30.3mm, bitumen saturation is 76.4%.

The above-mentioned asphalt mixture was molded in a grinding tool, and both sides were compacted 25 times.

Spray reflective paint on the deceleration road studs after demoulding, put them in a constant temperature (20°C) environment for 24 hours of curing, and obtain an asphalt mixture-based energy dissipation deceleration with 1d compressive strength of 40.2MPa and fracture toughness of 2000J/ ^m2 Spike.

Claims (7)

1. a bituminous mixture base energy dissipating deceleration railway spike, is characterized in that bottom surface is the circle of diameter 100-150mm, high 20-40mm, and it is circular-arc that upper surface is;

The bitumen aggregate ratio of described bituminous mixture is 5%～7%, wherein polyester fiber accounts for 0.3～0.5wt%, breeze accounts for 6～12wt%, and the maximum particle diameter of described bituminous mixture aggregate is 9.5mm, mass percents at different levels are: particle diameter is less than the 0-15% that accounts for of 0.075mm, between 0.075-0.15mm, account for 1-6%, between 0.15-0.3mm, account for 2-9%, between 0.3-0.6mm, account for 3-13%, between 0.6-1.18mm, account for 4-18%, between 1.18-2.36mm, account for 3-33%, between 2.36-4.75mm, account for 25-75%, between 4.75-9.5mm, account for 0-10%.

2. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that the pitch that described bituminous mixture adopts is the one in SBS, SBR, EVA, PE modified bitumen class.

3. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that the diameter of described polyester fiber is 15-50um, and length is 6-9mm, and tensile strength is greater than 500Mpa, and fusing point is greater than 250 DEG C.

4. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that described breeze is limestone dust, can be by the sieve aperture of 0.075mm.

5. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that the coarse aggregate in described bituminous mixture is the one in basalt or diabase.

6. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that the fine aggregate in described bituminous mixture is limestone aggregate chips.

7. bituminous mixture base energy dissipating deceleration railway spike as claimed in claim 1, is characterized in that described railway spike upper surface is coated with reflectorized material.