796results about How to "Improve road performance" patented technology

The invention relates to a microwave-irradiated waste-rubber powder modified pitch combination and its preparing method, using higher-wax content pitch as a substrate, adding in powdery butadiene-styrene rubber and microwave-irradiated waste rubber powder, and making high-speed cutting and uniform commixing to make the modified pitch. The modified pitch has the characters of high-temperature stability, obviously increased low-temperature extensibility, good antiaging property, etc, has road performance synthetically improved and can act as high-grade road pitch for use.

The invention relates to composite modified asphalt. The composite modified asphalt is prepared from the following raw materials in percentage by weight: 23.1-45.5% of polyurethane modified epoxy resin, 5-10% of compatibilizer, 5-10% of plasticizer, 5-10% of curing agent and 40-60% of road petroleum asphalt, wherein the polyurethane modified epoxy resin is terminal-amino polyurethane modified epoxy resin, terminal-isocyanato polyurethane modified epoxy resin or imidazolyl-terminal-capped polyurethane modified epoxy resin, the compatibilizer is naphthalene oil, asphalt tar or a mixture of naphthalene oil and asphalt tar, the plasticizer is dioctyl phthalate, dibutyl phthalate or a mixture of dioctyl phthalate and dibutyl phthalate, the curing agent is a modified aromatic amine curing agent, and the road petroleum asphalt is 70# petroleum asphalt, 90# petroleum asphalt or 110# petroleum asphalt. The road performance of concrete adopting the polyurethane epoxy resin composite modified asphalt further meets the requirements of technical specifications and surpasses that of the similar imported product Japan Epoxy, so that the composite modified asphalt can be widely applied to the construction of steel bridge deck pavement, and has great significance in opening a market for domestic epoxy asphalt materials.

The invention discloses polyurethane asphalt concrete prepared from aggregate, diluted asphalt and polyurethane prepolymer which serve as raw materials, wherein the aggregate is basalt, diabase or limestone; the diluted asphalt is a mixture formed by diluting road petroleum asphalt and gasoline or diesel at a weight ratio of 100:(18-100); and the polyurethane prepolymer is prepared by reacting isocyanate with a polyalcohol compound, a catalyst and a plasticizer. The polyurethane asphalt concrete serving as cool-mixed and cool-spread type asphalt concrete is applied to pavement or repair of an asphalt road surface; compared with the conventional hot state technology for a hot-mixed and hot-repaired asphalt mixture, the polyurethane asphalt concrete has the advantages that the energy is saved, emission of a large amount of greenhouse gas and emission of toxic and harmful gas during asphalt heating are reduced, the surrounding environment is protected, and the environment pollution is reduced; and furthermore, the polyurethane asphalt concrete is operated easily and high in efficiency and cannot be limited by a transparent condition, a repair dispersion condition and the like during production and construction.

The bentonite composition modified asphalt consists of asphalt in 94-98 portions, bentonite in 1-3 portions and powdered styrene-butadiene rubber in 1-3 portions. The bentonite is at least one of calcium base bentonite, sodium bentonite and organic bentonite. The preparation process of the bentonite composition modified asphalt includes the following steps: eliminating sand in bentonite, drying, grinding and 325-mesh sieving bentonite; adding bentonite into the asphalt matrix; and adding powdered styrene-butadiene rubber while slowly stirring to mix homogeneously. The modified asphalt has the features of high temperature stability, low temperature cracking resistance, excellent anti-ageing performance, low cost, etc.

The invention provides a steel slag and rubber asphalt concrete and a preparation method thereof. In the concrete, the steel slag is selected as a coarse aggregate and rubber asphalt is selected as a binder, and the concrete further comprises a fine aggregate and a filler; the mineral aggregate of the asphalt mixture is graded to form a coarse aggregate gap gradation framework solid type; the ratio of the rubber asphalt to the mineral aggregate is comprehensively determined through a Marshall compacting experiment to determine the range via the volume parameter of a Marshall test piece and verification on the road properties such as high-temperature rutting resistance and water damage resistance; when the rubber asphalt and the mineral aggregate are mixed and stirred, the heating temperature of the rubber asphalt is 175-180 DEG C and the heating temperature of the mineral aggregate is 10-30 DEG C higher than that of the rubber asphalt; moreover, the dry mixing time of the mineral aggregate is 15-20 s and the wet mixing time of the mineral aggregate is 35-40 s; and the ex-factory temperature of the steel slag and rubber asphalt concrete formed after the mixing and the stirring is 175-185 DEG C. The invention replaces the mineral aggregate by the steel slag, and can recycle the waste materials, save the stone resources, and reduce the destruction from the stone mining to the environment.

The invention relates to a two stage design method of buton rock asphalt modified asphalt mixtures, comprising two concrete stages of: in a first stage, BRA is not added, an optimal bitumen aggregate ratio of matrix asphalt mixtures is obtained under a condition of a mixing temperature being 155-165 DEG C; in a second stage, BRA is added on the basis of the optimal bitumen aggregate ratio of matrix asphalt mixtures obtained in the first stage, an optimal bitumen aggregate ratio of BRA modified asphalt mixtures is obtained under a condition of a mixing temperature being 165-175 DEG C. In comparison with common non-modified hot mix asphalt mixtures, the road performance of the hot mix asphalt mixtures is improved. In comparison with SBS modified asphalt mixtures, the road performance of thehot mix asphalt mixtures is basically equal, but the cost can be reduced by over 20%. The design method provided by the invention can make the design of buton rock asphalt modified asphalt mixtures to be more convenient and accurate. Buton rock asphalt modified asphalt mixtures under the design method have better road performance than that of the common matrix asphalt and the partly modified asphalt mixtures. The design method is a high cost performance design method of asphalt mixtures, and can be applied to paving in surfacing projects of urban streets and roads of all grades.

The invention relates to a process for preparing asphaltic concrete with conducting function, which is characterized in that the process includes the procedures of 1), preliminary treatment of aggregates, which means washing away the foreign matters of the steel slag with water. 2), raw materials preparation, which means that the percentage by weight of each component is that rough aggregates is 55%-80%, fine aggregates is 13%-30%, mineral filler is 7%-15%, the rough aggregates, fine aggregates and mineral filler are selected to reserve as aggregates, consumption of asphalt cement is 6%-8% of the weight of the aggregates, consumption of fabric stabilizer is 0.1%-0.5% of the gross weight of the aggregates and the asphalt cement, consumption of conducting material is 10-30% of the weight of the asphalt cement, and gradation design of SMA mixture is employed. 3), mixture blending, which means charging fractionally and blending multitime, the temperature is kept not lower 150 DEG C when molding. The preparing process has simple technique and low cost. The prepared asphaltic concrete has good conducting function and pavement using property.

The invention discloses reinforced emulsified asphalt concrete for roads and a preparation method of the concrete. The reinforced emulsified asphalt concrete for the roads comprises aggregate, waterborne epoxy resin emulsion and emulsified asphalt, wherein the weight ratio of aggregate to waterborne epoxy resin emulsion to emulsified asphalt is (90-110): (0.1-10): (7-20). The reinforced emulsified concrete disclosed by the invention can be used as cold-mixed and cold-laid asphalt concrete for being applied to spreading or repairing and the like of asphalt pavements, can solve the problems of high temperature sensitivity, insufficient binding capacity, poor durability and the like of traditional asphalt type material, and retains the advantages of low pollution and easiness in construction and operation of the emulsified asphalt and obtains excellent performances of high strength, high binding force, durability in use and the like through waterborne epoxy resin.

The invention relates to a preparation method of a tunnel asphalt surface layer material. A preparation method for damping porous noise-reducing tunnel asphalt pavement material is characterized in that it comprises the following steps: 1) preparation of high-viscosity and high-elasticity modified asphalt: base asphalt according to the mass ratio of each component: modifier SBS : Activated rubber powder: Viscosifying compatibilizer: Antioxidant: Stabilizer=100: 6.0~18.3: 20.2~45.7: 1.2~3.7: 0.2~1.4: 0.4~1.9, select; obtain high viscosity and high elasticity modification Asphalt; 2) Add flame retardant to high-viscosity and high-elasticity modified asphalt, heat and melt high-viscosity and high-elasticity modified asphalt to add flame retardant, stir for 3-9 minutes, and stand at 150-170°C for 15-30 minutes to obtain Flame-retardant high-viscosity high-elasticity modified asphalt; 3) according to the mass ratio, mineral material: flame-retardant high-viscosity high-elasticity modified asphalt: fiber stabilizer = 100: 3.6~5.2: 0.1~0.4, choose; noise tunnel asphalt surface material. The invention has the functions of noise reduction, flame retardancy and anti-skid.

The invention discloses a warm-mixing recycled asphalt mixture preparation method which comprises the following steps: I, preparing a compound regenerant; II, preparing a compound warm-mixing agent; III, measuring the mass content and natural gradation of old asphalt in an RAP material and respectively determining mass ratios of novel aggregate and novel mineral powder which are required for preparing the warm-mixing recycled asphalt mixture to the RAP material; IV, preparing a warm-mixing recycled asphalt mixture sample and determining an optimum asphalt-aggregate ratio of the warm-mixing recycled asphalt mixture; V, under the condition of the optimum asphalt-aggregate ratio, preparing the warm-mixing recycled asphalt mixture. According to the invention, the recycling rate of the RAP material reaches 70% or above, meanwhile, secondary aging of the asphalt mixture is avoided, the advantages of energy saving and carbon emission and harmful gas emission reduction are realized and the warm-mixing recycled asphalt mixture prepared through the preparation method has good pavement performance.

The invention provides a warm mix recycled asphalt mixture with a high RAP (Reclaimed Asphalt Pavement) mixing amount and high performance and a preparation method of the warm mix recycled asphalt mixture, and belongs to the technical field of highway construction materials. The mixture is prepared from the following components in percentage by mass: 50 to 70 percent of RAP material, 28.2 to 47.2 percent of aggregate and 1.8 to 2.8 percent of newly-doped asphalt and warm mix regenerant; the content of the warm mix regenerant is 0.3 to 0.5 percent of the mass of the newly-doped asphalt. The preparation method comprises the following steps of reclaiming and stacking of the RAP material, crushing and screening of a reclaimed material, stacking and detection of a reference material in different bins, and preparation of the warm mix recycled asphalt mixture. The RAP material, the aggregate, the asphalt and the warm mix regenerant are taken according to the requirement of raw material proportioning and are subjected to mixing treatment according to a conventional production technique of a hot-mixed asphalt mixture, wherein the mixing temperature is 120 to 140DEG C, and the mixing time is 20 to 35s, and finally the recycled asphalt mixture is obtained. The warm mix recycled asphalt mixture has the advantages of high RAP mixture ratio, low heating and constructing temperature, good constructability, easiness and pavement performance, low energy consumption, low emission and the like.

The invention discloses a synergic flame retardance asphalt material, which is characterized in that the asphalt material is prepared by mixing the following raw materials in parts by weight: 100 of asphalt, 0.2-40 of metal hydroxide, 0.1-30 of layered silicate; the asphalt is one or more of petroleum asphalt, rock asphalt and coal pitch; and the metal hydroxide is aluminum hydroxide and/or magnesium hydroxide. The invention also provided a preparation method of the synergic flame retardance asphalt material. According to the invention, the synergic flame retardance function of the metal hydroxide and the layered silicate is utilized to perform nano composite modification on asphalt; compared with the common organic flame retardant (such as a halogen flame retardant), the flame retardance technique adopted by the synergic flame retardance asphalt material is a green, non-toxic and environmentally friendly flame retardance technique; and the various road performances of the flame retardance asphalt material are good, the use requirements are met, the period of the storage stability can reach above one year, and the temperature sensitivity and the ageing resistance are obviously better than those of common asphalt.

A studless tire capable of exhibiting excellent performances on both icy road and snow-covered road, including tread portion 2 having a pair of middle circumferential grooves 3b each extending in a region between 15% and 25% of tread width TW from tire equator C to provide crown region CR between the middle grooves 3b and a pair of shoulder regions Sh between the middle groove 3b and ground contact edge E, wherein the crown region CR includes rows R1, R2 of blocks B having sipes S and defined by zigzag inner circumferential grooves 3a and crown lateral grooves 4a, 4b, each shoulder region Sh includes rows R3, R4 of blocks B having sipes S and defined by linear outer circumferential grooves 3c and shoulder lateral grooves 4c, 4d, and groove area rate Gs (%) of shoulder regions Sh is larger than groove area rate Gc (%) of crown region CR so that the difference (Gs−Gc) is from 3 to 7%.

The invention discloses a color emulsified asphalt and preparation method thereof, characterized in that color bituminous cements, emulsifier, water and modifying SBR rubber latex are included. According to proportioning by weight, parts of components are: 50.0 to 75.0 of color bituminous cements, 0.5 to 3.0 of emulsifier, 1.0 to 10.0 of modifying SBR rubber latex; 20 to 40 of water. The component and weight percent of the color bituminous cements comprise 30% to 65% of petropols, 1% to 3% of N,N'ethylidene bioleoylamido; lubricant or extract oil residual of lubricant. By selection of bituminous cements, in particular small amount of N,N'ethylidene bioleoylamido and SBR rubber latex, compared with other bituminous cements formulation, the formulation has better adhesiveness, which can prevent damages such as water damage, loose and peeling off of color path surface paved as well as tracks.

The invention discloses a special cement-base patching material and a corresponding cement concrete pavement quick repairing method built according to the special cement-base patching material. The patching material is prepared from the following ingredients in specific weight parts: magnesium phosphate cement, sulphate aluminum cement, early strength agents, water reducing agents, redispersible emulsion powder, pulverized fuel ash, silicon carbide, fine sand powder, detritus, carbon fiber and water-solubility polyurethane. The special cement-base patching material has the advantages that the mechanical performance, the anti-abrasion performance, the waterproof anti-permeability performance, the durability performance and the like meet application requirements; required construction equipment is simple; the construction process is simple and convenient; the influence of weather on construction is little; the construction can be performed at normal temperature and in rainy and snowy weather; the maintenance time is short; the traffics can be fast opened; the influence on the traffics is little; good social benefits and social benefits are realized; the engineering application prospects are wide.

The invention relates to a high efficiency resin fissures cementation glue for pitch and cement road surface fissures cementation. The fissures cementation glue comprises the following components by weight percent: 10 to 15 percent of aromatic hydrocarbon, 3 to 10 percent of modifier, 1 to 3 percent of intensifier, 3 to 10 percent of cosolvent, 30 to 60 percent of resin mixture and 10 to 20 percent of heavy traffic pitch. The aromatic hydrocarbon is heated to 60 to 70 degrees centigrade, the modifier is added to be stirred for 30 minutes, the intensifier and the cosolvent are added slowly step by step, the resin and the pitch are added at last, the temperature is kept at 120 degrees centigrade for 30 minutes under stir circumstance, and then the resin fissures cementation glue with excellent performance can be obtained. In the invention, the aromatic hydrocarbon is used to form even mixture among the modifier, the resin and the pitch so that resin group and pitch group are bridged under the action of the modifier. When used on the road surface, the resin exerts the high bondability characteristic and the like. The modifier is used to improve the road performance, as improving softening point, low temperature ductility and the like. At the same time, the invention is good glue material.

The invention relates to the technical field of traffic engineering, in particular to a pavement structure directly paved on a cement concrete bridge deck and a pavement method thereof. The pavement structure for the cement concrete bridge deck comprises a waterproof bonding layer, a stress absorption layer and a road surface layer, which are sequentially paved on the cement concrete bridge deck from bottom to top, wherein the waterproof bonding layer comprises a basalt gravel layer bonded on the cement concrete bridge deck through epoxy resin and a reactive waterproof binding agent layer coated on the basalt gravel layer. The invention also discloses a pavement method for the pavement structure. The pavement structure and the pavement method thereof enhance the bonding and shearing action between a pavement layer and a cement concrete slab, improve the using effect and service life of the pavement layer, reduce the temperature of mixing, transporting and paving, save energy and reduce environmental pollution; and the total thickness of the bridge deck pavement system is only 30 to 40 mm, so that the dead load of the bridge deck is greatly reduced, the pavement materials are saved and the construction cost is reduced.