Vehicle track and speed identification method

The invention relates to a vehicle track and speed identification method. The laser transmitting ends and the laser receiving ends of n+1 groups of laser emitting devices are mounted at the same horizontal position on both sides of a test road section, an infrared fog penetrating camera is fixed to a portal of a road, when a vehicle passes the test road section, laser beams emitted from the laser emitting devices are blocked by the vehicle, the level state of the laser receiving ends changes, meanwhile, the infrared fog penetrating camera is triggered by a triggering device to take pictures, a time recording unit records time, and a speed calculation unit and a track identification unit calculate the speed and the track corresponding to the vehicle according to the distance of the adjacent two laser emitting devices, pictures and time and transmits the speed and the track to a determination unit. The vehicle track and speed identification method can accurately and efficiently identify the ...

Simple method for determining road surface thickness of small traffic flow road

The present invention provides one simple method of determining the road surface thickness of small traffic flow road. The simple method includes the steps of: 1) determining the expressive falling value of soil foundation L0=L+Za.S; determining the designed road surface falling value Liquid=1134 Ne-0.2As; and determining the compression resilience modulus E0 of the soil foundation and the compression resilience modulus E1 of the bd layer; and 2) checking designed thickness map to obtain the equivalent thickness H of the bed layer. The method of the present invention is simple and practical.

Heat reflection coating for bituminous pavement

The invention relates to a heat reflection coating for bituminous pavement, solving problems of heat stability disease pavement and serious urban heat land effect caused by high heat absorptivity and high temperature of bituminous pavement in summer and providing a heat reflection coating with high heat reflectivity, sound wearing resistance and good durability for bituminous pavement. The technical scheme comprises the following steps: preparing component A with 100 parts of acrylic reactive resin, 5-30 parts of high reflecting filler, 0.2-5 parts of pigment, 0.2-5 parts of accelerators, 0.5-5 parts of plasticizers, 2-10 parts of solvents, and 0.5-5 parts of anti-settling agents; preparing component B of a firming agent; and mixing component A and component B and stirring uniformly to obtain the heat reflection coating for bituminous pavement. By applying the coating to bituminous pavement surface, the pavement temperature can be reduced by 10-20 DEG C in high-temperature summer. The invention ...

Novel SiO2/TiO2 photocatalytic composite powder preparation method

The present invention discloses a novel SiO2/TiO2 photocatalytic composite powder preparation method, which comprises: adopting elemental silicon powder as a main reactant and adopting sodium silicate and ammonia water as catalysts to react under a hydrothermal condition, and carrying out cooling and suction filtration to prepare a nanometer SiO2 sol A; adopting the nanometer SiO2 sols with different concentrations as dispersing liquids and adopting sodium hexametaphosphate (SHMP) and sodium dodecyl sulfate (SDS) as dispersing agents to treat nanometer TiO2 powder for a certain time at a certain ultrasonic power and a certain frequency to obtain a uniformly-distributed composite pre-dispersing liquid; and carrying out water bath evaporation on the pre-dispersing liquid under a stirring condition, drying, compounding the nanometer TiO2 particles and the nanometer SiO2 particles during a foaming process, and finally carrying out calcination grinding to obtain the TiO2/SiO2 photocatalytic ...

Cement concrete road structure with pervious isolating filter layer and combined layer and its construction method

Interfacial spreading agent and warm mixing regeneration composite modifier used for asphalt pavement warm mixing regeneration

The invention provides an interfacial spreading agent used for asphalt pavement warm mixing regeneration, and the interfacial spreading agent is prepared by reacting substituent silane, polyether and a catalyst; the substituent silane is amino, alkoxy or epoxy substituted silane, the catalyst is chloroplatinic acid, and the polyether is allyl polyether. The prepared interfacial spreading agent is added into an old asphalt mixture, quickly-stripped old asphalt is redistributed on the surface of old and new aggregate materials, road use performance of an old asphalt film can be repaired by chemical reaction, the old asphalt recycling can be realized, wrapping and cladding effects of the old aggregate material and an asphalt binder can be enhanced, and the road use performance of a regeneration mixture can be ensured. The invention also provides a warm mixing regeneration composite modifier which is prepared from raw materials including a warm mixing agent, a base oil component and the interfacial ...

Heat reflecting paint, and preparation method and application thereof

The invention discloses a heat reflecting paint, and a preparation method and an application thereof. The heat reflecting paint comprises the following components in parts by weight: 100 parts of fluorine-containing (methyl) acrylate polymer emulsion, 2-30 parts of reflecting pigment, 0.1-4 parts of filler, 2-40 parts of flatting agent, 1-20 parts of coalescing agent, 0.01-1 part of thickening agent, 0.01-2 parts of dispersant, 0.001-1 part of wetting agent, 0.1-60 parts of distilled water and 0.5-5 parts of cross-linking agent. The heat reflecting paint provided by the invention is high in heat reflection performance, and excellent in acid and alkali resistance, weather fastness and stain resistance. The heat reflecting paint provided by the invention is applied to a bituminous pavement; the heat reflecting paint is capable of relieving the urban heat island effect by reducing the road surface temperature, and reducing the environmental pollution generated in the use process of the coating ...

Freeze-drying type TiO2/SiO2 photocatalytic composite powder and preparation method thereof

The present invention discloses freeze-drying type TiO2/SiO2 photocatalytic composite powder and a preparation method freeze-drying method thereof, and belongs to the technical field of photocatalytic materials. According to the present invention, elemental silicon powder is adopted as a main reactant, sodium silicate and ammonia water are adopted as catalysts, a reaction is performed under a hydrothermal condition, cooling and suction filtration are performed to prepare a nanometer SiO2 sol A, the nanometer SiO2 sol A is adopted as a dispersing liquid, polyethylene glycol (PEG) and sodium hexametaphosphate (SHMP) are adopted as dispersing agents, nanometer TiO2 is subjected to an ultrasonic treatment for a certain time at a certain ultrasonic power and a certain temperature to obtain a uniformly-distributed composite pre-dispersing liquid B, the composite pre-dispersing liquid B is placed into a freeze-drying machine to dry at a certain condensation speed at a set temperature under a set ...

Asphalt mixture life prediction method considering fatigue-creep interaction damage effect

The invention relates to an asphalt mixture life prediction method considering a fatigue-creep interaction damage effect, and belongs to the field of road engineering. The method comprises the following steps: (1) determining a complex modulus of an asphalt mixture under the action of a period load; (2) determining a damage variable of the asphalt mixture; (3) building a creep damage equation and a fatigue damage equation of the asphalt mixture respectively; (4) building an asphalt mixture life prediction model under the combined action of creep damage and fatigue damage. Compared with a conventional asphalt mixture life prediction method, the viscoelastic behavior of the asphalt mixture is considered and a more accurate prediction model is built. The method accurately describes asphalt mixture damage failure process and rule, has the advantages of wide application range and reliable calculation results, and provides a more reliable method for structural design of an asphalt pavement.

Modified emulsified asphalt, preparation method and self-repairing application

The invention discloses modified emulsified asphalt, a preparation method and a self-repairing application. The emulsified asphalt is prepared from the following raw materials in parts by weight: 3-8 parts of a disulfide bond-containing waterborne polyurethane emulsion and 20-50 parts of matrix emulsified asphalt, wherein the waterborne polyurethane emulsion containing the disulfide bond is obtained by carrying out a reaction on bifunctional polyether polyol, trifunctional polyether polyol, diisocyanate and hydroxyl disulfide. The modified emulsified asphalt has excellent self-repairing capability and reversible repairing characteristic.

Method for arranging road humps on steep slope road section

The invention discloses a method for arranging road humps on a steep slope road section, comprising the following steps of: (1) dividing a steep slope road section along the longitudinal direction by a roadway boundary into a downhill road surface and an uphill road surface, and transversely arranging rubber road humps on the downhill road surface; and (2) arranging a plurality of partition piles on the roadway boundary at equal intervals from the rubber road humps to the uphill direction. In the invention, the steep slope road section is divided into the downhill road surface and the uphill road surface along the longitudinal direction, the rubber road humps are transversely arranged on the downhill road surface, and the partition piles are arranged on the roadway boundary at equal intervals from the rubber road hump to the uphill direction so as to guide vehicles to the roadway provided with the road humps in advance to reduce by-pass phenomena of the vehicles running downhill, thereby ...

Tester for testing water stability of asphalt mixture

The invention provides a tester for testing water stability of an asphalt mixture. The tester comprises a container, a cover plate, a water leveling chamber, an air chamber, a pressure meter, an air inlet valve, an air exhaust valve, a micro-adjustable valve, a water adding valve, an electric heat pipe and a steel partition board, wherein the electric heat pipe is arranged at the bottom in the container; the steel partition board is arranged in the middle in the container; an opening in the top of the container is covered tightly with the cover plate; the water leveling chamber is arranged on the side, close to the inside of the container, of the cover plate; the air chamber is arranged on the side, away from the inside of the container, of the cover plate; and the air chamber is communicated with the inside of the container through an air hole; the air inlet valve, the air exhaust valve, the micro-adjustable valve and the pressure meter are all installed on the cover plate and are communicated ...

Method for utilizing laser and infrared rays for recognizing vehicle track

The invention relates to a method for utilizing laser and infrared rays for recognizing a vehicle track. The laser transmitting end and the laser receiving end of a laser correlation device are arranged on the two sides of a road section for recognizing the vehicle track and located at the same horizontal position. Infrared distance meters are installed under the laser transmitting end and the laser receiving end of the laser correlation device respectively. When a vehicle passes through a road section to be detected, as laser emitted by the laser correlation device and the infrared rays emitted by the two infrared distance meters will be shielded by the vehicle, the level state of the laser receiving end and the level state of the pair of infrared distance meters are changed, and the motion track of the vehicle is determined according to changes of the level states and reading of the infrared distance meters. According to the method, a lane where the vehicle is located can be detected ...

Modeling method of bio-oil average molecular model

The invention discloses a modeling method of a bio-oil average molecular model. The modeling method comprises the following steps: (1) according to an element analysis test, obtaining the element composition of the bio-oil and the content of each element; (2) according to the 13C-NMR spectrum of the bio-oil, calculating one or more of the following structural parameters of the bio-oil: aromatic carbon rate, aromatic hydrogen rate, fat carbon rate, average methylene chain length, alkane chain branching degree, aromatic ring substitution degree and bridge cycle ratio; (3) determining the types and the number of groups in the bio-oil according to photoelectron spectroscopy; (4) determining the molecular weight interval of the bio-oil according to the gel permeation chromatography; (5) determining an initial model of the average molecules of the bio-oil according to the parameters obtained in the steps (1)-(4); and (6) optimizing the molecular structure of the initial model to obtain a bio-oil ...

Preparation method of yellow-green long-afterglow fluorescent material and application of ammonium bicarbonate

The invention discloses a preparation method of a yellow-green long-afterglow fluorescent material. The preparation method comprises the following steps: uniformly mixing raw materials obtained according to the composition of the yellow-green long-afterglow fluorescent material, a fluxing agent and ammonium bicarbonate to obtain a mixture; and calcining the mixture in a reducing atmosphere, and cooling the calcined product to obtain the yellow-green long-afterglow fluorescent material. The formula of the yellow-green long-afterglow fluorescent material is Sr1-x-yAl2O4:Eux<2+>,Dyy<3+>. According to the preparation method, the luminous intensity of the yellow-green long-afterglow fluorescent material can be improved, and the afterglow attenuation speed is reduced. The invention further discloses application of ammonium bicarbonate in improving the luminous intensity of the yellow-green long-afterglow fluorescent material or reducing the afterglow attenuation speed of the yellow-green long-afterglow ...

Flowing gas humidity control device

The invention discloses a flowing gas humidity control device. The flowing gas humidity control device comprises a gas source and a humidifying system, wherein the humidifying system is used for mixing gas of the gas source into humidified gas used by a testing device. The flowing gas humidity control device further comprises a humidity sensor and a humidifying loop system, wherein the humidity sensor is used for detecting the humidity of the humidified gas, and the humidifying loop system is used for returning the humidified gas which fails to reach the standard during detection to the humidifying system for remixing. According to the flowing gas humidity control device, the additionally arranged humidity sensor can detect the gas which fails to reach the standard in real time, the additionally arranged humidifying loop system can return the gas which fails to reach the standard to the humidifying system for remixing so that the remixed gas can be used for testing needs, through the reutilization ...