5431 results about "Asphalt pavement" patented technology

The invention relates to an asphalt warm-mix agent, comprising the following components in percentage by weight: 1.0-2.0% of alkylamine type cationic surfactant, 3.0-5.0% of amide type cationic surfactant, 5.0-10.0% of ammonium salt type cationic surfactant, 1.01.5% of calcium chloride, and water with residual percentage. The invention also relates to an asphalt mixture with the pavement applicability basically same as the traditional hot-mix asphalt mixture and the mixing and construction temperature lower than 20-50 DEG C; the purposes of energy saving, emission reduction, longer construction season, asphalt aging reduction and easier compaction are realized by reducing the mixing temperature; the indexes of the compaction degree, the water stability, the high-temperature performance, the low-temperature performance and the like of the pavement after paving the asphalt are not lower than those of hot-mix asphalt mixture at the same stage; and the service life of the asphalt pavement is efficiently guaranteed.

The invention discloses a detection method of bituminous mixture, including the following steps: digital image collection of bituminous mixture is completed; image processing of the acquired digital image is completed to obtain the content of compositions of the bituminous mixture. Moreover, the invention also discloses a detection system for the bituminous mixture. Both the method and the system can complete effective separation and extraction of bitumen, airgap, aggregate and aggregate particle of different particle diameter and realize direct determination and calculation of volumetric composition characteristic parameter of the bituminous mixture through converting the obtained characteristic parameter into volume ratio; moreover, the invention improves the mechanical property of the bituminous mixture and provides reliable basis for the scientificity in bituminous pavement engineering research.

The invention relates to warm mixed asphalt cement and a preparation method thereof. 100 percent of warm mixed asphalt cement comprises the following components in percentage by weight: 90.0-97.0 percent of asphalt cement, 2.0-8.0- percent of rheological modification agent and 0.5-5.0 percent of macromolecular polymer, wherein the rheological modification agent is formed by combining the following substances: (a) byproducts produced in a petroleum refining process, wherein the weight content of aromatics is 50-80 percent, and the kinematic viscosity at 100 DEG C is 20 mm<2>/s to 70 mm<2>/s; and (b) derivatives produced in petrochemical industry, coal chemical industry and forestry chemical industry; through the warm mixed asphalt cement, the high-temperature rutting resistance, low-temperature tensile strength and resistance to brittle fracture of the asphalt cement are improved while energy conservation and environmental protection are realized; the asphalt cement is mainly applied to construction and maintenance of various grades of highways and municipal roads, and is particularly suitable for cities, parks and tunnels with higher environmental protection requirements.

The invention relates to a composition for warm-mix asphalt pavements, including 91 to 94 mass% of asphalt, 3 to 5 mass% of thermoplastic elastomer, 2 to 4 mass% of maleic anhydride-grafted polyethylene (MA-g-PE) wax with graft rate from 4 to 10%, and 0.1 to 1 mass% of operation oil. The viscosity of the composition is not more than 700 cP under the temperature of 135 DEG C. The composition satisfies the requirements of high temperature plastic deformation resistance and low temperature crack resistance.

The invention relates to a method for producing an asphalt road surface material, in particular to a method for producing a wet-mixing, skid-resistance and noise-reduction asphalt road surface material. The invention is characterized in that the method comprises the following steps: 1) the production of modified asphalt: the modified asphalt consists of basic asphalt, modifying agent A, modifying agent B, stabilizing agent and antioxidant; and the mass ratio of the components is as follows: 100:2.0-6.5:1.6-9.4:0.18-0.45:0.1-0.6; 2) the production of wet-mixing asphalt: the wet-mixing asphalt consists of the modified asphalt, modifying agent C, sulfur and diatomite, and the mass ratio of the components is as follows: 100:1.5-6.0:1.0-10.0:1.0-8.5; 3) the selection of mineral aggregate graduation: the mineral aggregate consists of coarse aggregate, fine aggregate and stuffing, and the mass ratio of the components is as follows: 100:7.0-14.0:3.3-5.9; 4) the production of wet-mixing, skid-resistance and noise-reduction asphalt road surface material: the material consists of the mineral aggregate, wet-mixing modified asphalt and fiber, and the mass ratio of the components is as follows: 100:4.5-5.0:0.225-0.533. The asphalt road material produced by the method has lower construction temperature and has the functions of reducing noise and resisting skid.

The invention relates to a modification scheme decision-making system and method for a bituminous pavement, and belongs to the field of pavement maintenance technologies. According to the system, based on a B/S structure, a pavement structure strength index (PSSI), a pavement riding quality index (RQI), a pavement crack index (PCI) and a pavement rut depth index (RDI) serve as control indexes, a rut depth (RD), a friction coefficient (SFC), a crack rate (CR) and a functional damage rate (FDR) serve as single-value triggering indexes, a negative index model, a modification S model and a structure behavior model are adopted for the system, a user can designate model parameters according to needs to achieve different prediction effects, maintenance history and performance index prediction are combined to be analyzed, and detection data of the pavement over the years are uniformly stored in a lane-division mode. The minimum length unit for evaluating the performance of the pavement is 200 m, in this way, the resolution ratio of original state evaluation of the pavement is increased, a basis is provided for refining a maintenance design, and the function of displaying path, region and road segment basic information is achieved.

Provided is a temperature-adjusted and modified recycled ASCON composition for reusing 100% of waste ASCON for road pavement, and a method for manufacturing same, wherein the composition is used in asphalt pavement as a material for the wearing course, surface course, binder course, and base course, and the method comprises: feeding 100 wt % of waste ASCON aggregate having up to a 53 mm particle size distribution into a mixer via a feeding inlet for new aggregate; adding 0.1 to 20 wt % of a recycling modifier and 0.1 to 20 wt % of a temperature-adjusting additive to the waste ASCON via the feeding via the inlet for new aggregate; and homogeneously mixing said materials at 5 to 180 DEG C for 0.5 to 3 minutes. The recycling modifier improves the physical properties of recycled ASCON, while the temperature-adjusting additive adjusts the temperatures for producing and constructing recycled ASCON. The present invention may provide economic, social and technological conveniences by improving the overall recycling technology of waste ASCON. The conveniences may be achieved by virtue of: cost-saving in production by using only waste ASCON without any new materials; saving waste disposal costs; preventing the destruction of nature to obtain aggregate; reducing the consumption of new asphalt; preventing environmental pollution through the reuse of waste products; preventing the early occurrence of plastic deformation and fatigue cracks due to improving the quality of the recycling modifier; economic benefits from the prolonged lifespan of road pavement; the possibility of being used as a material for the wearing course and surface course of major roadways; saving energy in the production and construction of recycled ASCON by adding the temperature-adjusting additive; and reducing greenhouse gas emissions.

The invention relates to asphalt road repairing equipment, aiming at providing an intelligent car for repairing pits in asphalt roads capable of accurately calculating and supplying filling asphalt. The intelligent car comprises a road carrying tool, a main storage bin, an auxiliary storage bin and a space scanning device, wherein the space scanning device, the main storage bin and the auxiliary storage bin are arranged on the road carrying tool; the auxiliary storage bin is arranged below the main storage bin; a feeding port below the main storage bin is provided with a material fetching valve; and the auxiliary storage bin is provided with a weighing device and a discharging valve. The technical scheme of the intelligent car for repairing pits in asphalt roads has the characteristics ofbeing capable of calculating the volume of the road pits accurately, estimating the volume and weight of the filling and weighing the usage accurately.

A paving asphalt composition for improving the durability and longevity of asphalt road surfaces is disclosed. The paving asphalt composition includes asphalt base stock, heavy residuum of re-refined motor oil, and a chemical modifier. The heavy residuum of re-refined motor oil preferably has an API gravity of at least about 12, a kinematic viscosity greater than about 400 centistokes at 140 DEG F., a flash point greater than about 400 DEG F. and a mass loss less than about 3%. The paving asphalt composition may also include a polymer. A method of forming the paving asphalt composition and a method of paving roads are also disclosed.

The invention relates to the research field of asphalt pavement materials and structures in highway engineering, and discloses a torsional shear test device for asphalt pavement materials and structures, which is characterized in that it includes a machine base, a reaction force frame arranged on the machine base, and a The worm gear mechanism at the bottom of the reaction force frame, the worm input end of the worm gear mechanism is connected to the pressure motor, the output end of the worm gear is connected to the lower support plate for clamping the test piece, and the pressure sensor is arranged on the lower support plate; the reaction force frame A torque motor is arranged on the top, and the output shaft of the torque motor is connected downwards to the disc torque sensor and the upper support plate for clamping the specimen in turn.

The invention provides a road pavement draining method and a drainage structure system. The road pavement draining method is characterized in that water falling on a lane vertically passes through a lane water-permeable surface layer, arrives at a waterproof bonding layer preventing water penetration, and enters into a water-permeable drainage system located at outer sides of drainage curbstones by a cross slope and the drainage curbstones located at outer sides of the lane; the bottoms of the drainage curbstones are provided with water-permeable curbstone bases; the water-permeable drainage system comprises a broken stone blind drain drainage system arranged at the bottoms and the outer sides of the water-permeable curbstone bases; the bottom of the broken stone blind drain drainage system is provided with a longitudinal drainage water-permeable pipe; and most of the water discharged into the water-permeable drainage system at the outer sides permeates into soil at the outer sides and forms ground water, and the rest of the water passes through the longitudinal drainage water-permeable pipe in the broken stone blind drain drainage system and then is discharged into a municipal pipe. The road pavement draining method solves the problem that rainwater on a drainage bituminous pavement is directly discharged into the municipal pipe, and has functional advantages of good safety, ecological benefits, energy saving and good economical efficiency.

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.

The invention discloses an in-site heating regeneration maintenance vehicle for asphalt pavements, comprising an automatic running type vehicle body, an asphalt pavement heating device for heating an asphalt pavement to melting state, a pavement planing-milling device for spiking up the molten asphalt pavement, an asphalt mixing device for mixing asphalt and additives to repair a pavement, an asphalt spreading device for spreading the mixed new asphalt material on the spiked pavement and a pavement compacting device for leveling and compacting the spread pavement, wherein the asphalt pavement heating device, the pavement planing-milling device, the asphalt mixing device, the asphalt spreading device and the pavement compacting device are sequentially arranged on the automatic running type vehicle body from front to back. The in-site heating regeneration maintenance vehicle for asphalt pavements can continuously complete the multiple operations of heating, spiking up, re-spreading, leveling and compaction, hydraulic transmission is adopted for a transmission device of the entire vehicle, the space can be reasonably utilized, the structure is simplified, the entire reliability of the device is beneficially guaranteed, and the field use cost is saved.

Thermal processing of recycled asphalt pavement (RAP), having up to approximately 8% or more moisture content, dries and preheats the material to enhance efficient recycling in a hot mix asphalt plant. A combustor and heat exchanger reheat circulating hot oil, which with hot gas, moves through a hollow auger and around the RAP counter to the flow of RAP. Moisture is forced outward from within the particles and is flashed away by the hot exhaust gas. A similar secondary heater heats the RAP to just below asphalt coking temperature before the hot dry RAP is added as an aggregate to the hot mix asphalt plant.

The invention relates to the technical field of underground road bituminous pavement service performance evaluation. In order to make the evaluation result objective, the effective scientific decision can be provided for the road maintenance and repair department. In order to fulfill the aim, the adopted technical scheme is as follows: the entropy weight-based underground road bituminous pavement service performance evaluation method comprises the following steps of: 1. determining a composite underground road pavement performance integrated evaluation index system, namely 1.1. determining evaluation indexes and evaluation standards, 1.1.1. determining underground road bituminous pavement damage condition evaluation indexes and standards, 1.1.2. determining composite underground road pavement driving quality evaluation indexes and standards, and 1.1.3. determining composite underground road pavement safety performance evaluation index and standards; 1.2, establishing a comprehensive evaluation model; and 2. performing a composite underground road pavement service performance evaluation method. The method is mainly applied to the underground road bituminous pavement service performance evaluation.

The invention discloses an oil-resistant road asphalt modifier and a preparation method thereof. The oil-resistant road asphalt modifier comprises the following components in parts by weight: 20-50 parts of styrene-ethylene/butylene-styrene segmented copolymer (SEBS), 10-30 parts of polyolefin resin, 15-45 parts of polymer wax and 10-30 parts of extract oil with rich aromatics by weight. The preparation method comprises the following steps of: feeding the materials in proportion to a dual-screw extruder to stretch and granulate, extruding at a temperature of 120-200 DEG C and preparing the oil-resistant road asphalt modifier. With adoption of the modifier disclosed by the invention, the anti-aging performance, the high-temperature usability and the oil resistance can be remarkably improved while the production process for the oil-resistant road asphalt modifier can be simplified; moreover, the modifier can be used for lowering hot mixing and construction temperature of the asphalt mixture, reducing energy consumption, reducing the discharging of harmful gases such as smog and reducing pollution to the environment.

The invention belongs to the technical field of road engineering, in particular to a color asphalt binder capable of being directly applied and a preparation method thereof. The binder consists of 25 to 38 percent of petroleum resin, 12 to 22 percent of aromatic oil, 8 to 15 percent of styrene-butadiene triblock copolymer (SBS), 28 to 32 percent of color pigment, 5 to 10 percent of abherent, 0.05 to 1 percent of plasticizer, and 0.05 to 1 percent of antioxidant. The binder has a simple preparation method, can meet the technical index requirements of various building asphalts by adjusting the content of the petroleum resin, the content of the aromatic oil and the content of the styrene-butadiene triblock copolymer. Color asphalt binders in red, yellow, blue and other colors can be produced by regulating the color pigment. Furthermore, in the process of transporting the color asphalt binder, heating transportation is not required, and a special tanker for transportation is not required, so that the problems of low transportation efficiency and difficult operation of the color asphalt are solved. Meantime, the storage time of the solid particular color asphalt binder is greatly prolonged, and the color asphalt binder is convenient to apply, and has positive effect on popularization and application of color asphalt pavements.

The invention provides a fatigue life prediction method for a high-modulus asphalt mixture pavement. The method comprises the steps that structural temperature distribution, pavement material dynamic modulus and temperature axle load distribution of the high-modulus asphalt mixture pavement serve as basis parameters; a fatigue strain equation is fit according to an indirect tension fatigue test result; ANSYS software is adopted to construct a pavement structure finite element model, and maximum tension strain of a bottom layer at different axle load levels in different temperature regions is calculated; according to the Miner fatigue cumulative damage rule, fatigue cumulative damage results of a high-modulus asphalt mixture at different axle loads and different temperatures are calculated according to the formula: . The fatigue life prediction method for the high-modulus asphalt mixture pavement has the technical advantages that temperature gradients and axle load distribution of the asphalt mixture pavement are fully considered, an accurate prediction model is established, the process and law of fatigue attenuation of the asphalt mixture are accurately described, the application range is wide, and calculation results are reliable, so a more reliable method is provided for structural design of the asphalt pavement.

The invention relates to a preparation method for phase-change asphalt pavement material and is characterized in that the method comprises the following steps: (1), the preparation of phase-change asphalt modifier: firstly, selecting the materials based on the mass ratio among phase change material, coagulant, support material and coupling agent which is equal to 100:1-5:10-50:1-5; secondly, adding the phase change material into the silica sol, and then adding the coagulant dropwise to form gel; drying the gel, cooling the gel to room temperature and then taking out and mashing the gel to get powder through mixing; vacuuming the powder at 30-50 DEG C for 2-4 hours, then adding the support material under the protection of shielding gas; at 80-100 DEG C, adding the coupling agent for hydrophobic modification; then granulating to get the phase-change asphalt modifier; (2), the preparation of phase-change asphalt pavement material: firstly, selecting the materials based on the mass ratio among coarse aggregate: fine aggregate: filler, asphalt, fiber and phase change asphalt modifier which is equal to 100:10-20:1-8:2-6:0.2-0.5:2-10; then stirring the materials to get the phase-change asphalt pavement material. The phase-change asphalt pavement material prepared through the invention can improve the high temperature stability of pavement surface.

The invention relates to an emulsified SBS polymer modified asphalt and preparation method thereof. At present, emulsification and emulsified modified asphalt applied to surfacing is hard to produce and not stable in quality, high temperature performance improvement is not obvious. The raw materials of the invention are matrix asphalt, water, SBS asphalt modifier, compound asphalt emulsifier, emulsification stabilizer and hydrochloric acid; firstly the matrix asphalt is heated, added with SBS asphalt modifier and then stirred to be swelled, high speed grinding by colloid grinder and full dispersion are carried out, and heat preservation growth is carried out to obtain SBS modified asphalt; compound asphalt emulsifier is added into water, emulsification stabilizer smoothened by water in advance is added, and appropriate hydrochloric acid is added to adjust pH value, so as to obtain liquid soap; and finally the SBS modified asphalt is subject to temperature reduction and then mixed with the liquid soap and emulsification dispersion is carried out, thus obtaining emulsified SBS polymer modified asphalt. The invention is applicable to coat tacking, coat sealing, surface treatment, slurry sealing and asphalt pavement recycling, asphalt wet-mixing of road construction and cerement asphalt mortar layer of passenger special line plate type unballasted track.

The super thin fast repair material for highway and airport runway consists of early strengthened hydraulic cementing material 30-90 wt%, polymer resin emulsion or water dispersible polymer powder 0.1-40 wt%, fine sand 8-60 wt% and inorganic modifier 0.1-15 wt%. The repair material is suitable for thin layer and super thin layer repairing of concrete and asphalt road surface, may be also used for repairing damaged part when sand, crushed stone and other aggregate are added. It is also suitable for repairing inner and outer walls of building. The finishing super thin cement mortar layer has the breaking strength reaching 2-4 MPa in 2-3 hr and compression strength up to 20-30 MPa. The present invention can raise the antiwear performance, weather resistance and engine oil and hydraulic oil corrosion resistance.

The invention provides an asphalt pavement crack pouring process and a pavement crack repair agent. The process is mainly characterized by adopting a composite structure repair mode of bonding a composite fiber cloth on the upper surface of a repair agent layer. The used repair agent is prepared from the following raw materials in percentage by mass: 65-90% of substrate asphalt, 3-10% of modifying agent, 3-20% of solvent oil and 1-5% of plasticizing agent. The process is applicable to the crack repair of an asphalt pavement at (-16)-15 DEG C in autumn and winter, reduces the damage of snowmelt to the pavement in winter, prolongs the service life of the pavement, improves the pavement quality and lowers the maintenance cost.

The present invention relates to emulsified asphalt modified by adopting water-base epoxy resin. It is characterized by that it utilizes water-base epoxy resin emulsion and solidifying agent to modify the emulsified asphalt, in which the general emulsified asphalt content is 100 portions, water-base epoxy resin emulsion content is 3-15 portions and the solidifying agent content is 20%-25% of water-base epoxy resin emulsion content.

The invention provides a paver asphalt temperature segregation infrared detection system and a detection method, and the system comprises an electric subsystem and a data analysis subsystem; the electric subsystem is used for detecting asphalt temperature segregation during pavement construction and storing detection data; the data analysis subsystem is used for consulting the data detected by the electric subsystem and analyzing the paving quality of the asphalt pavement so as to obtain a complete detection result of the entire paved road. With the invention, real-time monitoring of the interior of the asphalt pavement can be performed during pavement paving; adverse factors generated during asphalt paving can be obtained with the monitoring results, and a solution scheme can be formed at first time; therefore the adverse factors can be controlled, and their effects can be reduced or completely eliminated, which ensures the paving quality.

The invention relates to a test device, specifically to a flowing water washout prevention test device for asphalt mixture. The invention aims to solve the problem that no test device is available for evaluating the washout effect of flowing water on asphalt mixture. In the inventive device, a pedestal is disposed at the bottom of the inner cavity of a washout barrel (1), a piston (2) is disposed on the inner cavity of the washout barrel (1), an upper cover is disposed at the top end of the washout barrel (1), a conduit (3) and an upper water pipe (4) are disposed at the side wall of the washout barrel (1), a pressure meter (5) is disposed on the upper water pipe (4), and a lower water pipe (6) is disposed in the lower part of the side wall of the washout barrel (1) and provided with a valve (9). The invention can simulate the effect of flowing water pressure arising from vehicle traveling on the asphalt concrete pavement on the asphalt pavement under different temperature conditions.

The present invention relates to road maintenance technology, and is especially fast process of repairing pit in asphalt road. The fast process of repairing pit in asphalt road includes the steps of: cleaning pit, cutting the edges and bottom of the pit to certain sizes, adhering prefabricated road asphalt brick to the pit with asphalt adhesive, filling the gaps with asphalt adhesive and short time curing. The technological process has the advantages of environment friendship, saving in energy, low cost, short operation time, high strength and high durability of the repaired road, etc.