32results about How to "Improve low temperature cracking resistance" patented technology

The invention discloses a high-modulus asphalt mixture additive and a preparation method thereof. The additive comprises, by weight, 100 parts of plastic, 10-20 parts of EVA resin, 15-25 parts of butadiene-styrene rubber and/or derivative thereof, 10-20 parts of ethylene tar and 10-20 parts of composite modifier, wherein the composite modifier is composed of a mesoporous molecular sieve coated with epoxy grafted polyethylene wax. The additive has high compatibility with asphalt and a mixture, so that resistance to low-temperature cracking of a high-modulus asphalt mixture is improved remarkably, the additive has excellent resistance to track and water damage, and the mixture is low in blending temperature and high in construction peaceability.

By the present invention, in order to suppress cold cracking, consumable electrode type arc welding is placed at the preceding side and laser welding is placed at the succeeding side with respect to the direction of weld progress, using a high-strength steel sheet having a tensile strength of at least 780 MPa as the welding subject, the distance between the position at which a welding wire for arc welding is aimed and the position of laser beam irradiation is set to a range of 3-5 mm, the electrode angle for arc welding is set to a sweepback angle in the range of 20-60° toward the direction of weld progress, and the incidence angle of the laser beam for laser welding is set to an angle in the range of 0-30° in the direction of weld progress from the vertical direction.

The invention discloses a biological asphalt material for roads and belongs to road construction materials. The biological asphalt material is prepared from the following raw materials in parts by weight: 10 to 30 parts of matrix asphalt, 5 to 18 parts of waste polymer material powder, 0.05 to 0.2 part of zinc oxide, 10 to 20 parts of a diluent, 0.5 to 4 parts of a homogenizing agent MS, 0.1 to 0.3 part of stabilizer sulfur, 0.05 to 0.2 part of an additive, wherein the additive is prepared from the following raw materials in parts by weight: 0.02 to 0.1 part of graphene powder and 0.03 to 0.1part of carbon nanotube. The biological asphalt material for the roads, disclosed by the invention, effectively recycles wastes and has the advantages of high toughness, good stability and the like when being used as a road construction material. The biological asphalt material for the roads significantly improves the strength, water stability and low temperature cracking resistance of the asphaltmaterial by adding graphene and the carbon nanotubes.

The invention relates to a microstructure analysis method of asphalt and a modifier thereof, and belongs to the technical field of microstructure analysis of modified asphalt. The problem that the microstructures of asphalt and the modifier thereof cannot be comprehensively, stereoscopically and clearly analyzed by using only one characterization method at present is solved. According to the microstructure analysis method provided by the invention, neutron small-angle scattering samples of an SBS modifier, matrix asphalt and SBS modified asphalt are prepared at first, a neutron small-angle scattering test is performed on the samples to obtain initial experimental data, and the initial experimental data are processed to obtain an absolute intensity scattering curve, and then different models are fitted through the absolute intensity scattering curves of the samples to quantitatively analyze the microstructures of the SBS modifier, the matrix asphalt and the SBS modified asphalt. Throughthe analysis of the microstructures of the asphalt and the modifier thereof, the modification mechanism of the SBS modified asphalt can be better revealed, and a relationship between the microstructure of the modified asphalt and the macroscopic properties thereof can be established, so that the performance of the SBS modified asphalt, and the service level and the service life of asphalt pavements can be better improved.

The invention provides mineral powder for a bituminous mixture and a production method of the mineral powder. The mineral powder provided by the invention consists of limestone and an admixture. The admixture comprises a water repellent and diatomaceous earth, and further comprises a modified polymer for modifying a product of the bituminous mixture. The water repellent, the diatomaceous earth and the modified polymer all take up 5-10% of the weight of the limestone. The production method of the mineral powder provided by the invention comprises the steps of: placing and smashing the limestone and the admixture by a smashing device to a certain granularity to obtain finished product of the mineral powder which is same in proportion with raw materials; during production of the bituminous mixture, replacing the mineral powder with current mineral power and a modifier, and adding 3-10% of the mineral powder by weight to the bituminous mixture. The mineral powder is simple in production process and environment-friendly, and the pavement performance is improved and the cost is lowered when the mineral powder is used in the bituminous mixture.

The invention relates to a lake asphalt/SBR (styrene butadiene rubber) composite modifier and a preparation method and application thereof. The lake asphalt/SBR composite modifier is a pre-dispersed material formed by the lake asphalt, polymer SBR and a compatilizer via melt blending, and the modified asphalt can be obtained by melt blending of petroleum asphalt and a stabilizer. The lake asphalt/SBR composite modifier is the pre-dispersed material capable of remarkably improving capacities of high-temperature deformation, low-temperature cracking resistance and anti-water damage, the pre-dispersed material is then added to the petroleum asphalt, and the lake asphalt/SBR composite modified asphalt uniform in dispersion and less prone to layered segregation by the aid of the advantage of good compatibility of the pre-dispersed material and the petroleum asphalt; the modified asphalt is applied to construction of heavy traffic asphalt pavement of high-temperature, moist and rainy regions, asphalt pavement diseases can be remarkably reduced, pavement maintenance cost is lowered, and service life of the asphalt pavement is prolonged.

The invention relates to a material prescription for road maintenance and the construction method thereof, in particular to the prescription and the construction method of a fibre modified slurry seal layer which consists of the following materials (calculated by weight): grade compound of 82.11 parts, modified emulsification bitumen of 9.44 parts, spraying twistless roving of 0.24 parts and water of 8.21 parts. The construction method comprises the steps as follows: firstly, disposing the damage of maintaining road; secondly, choosing a pneumatic cutting machine and a slurry seal layer vehicle which are capable of adding spraying twistless roving measurement; thirdly, mixing the materials, adopting the prescription and the construction method of the fibre modified slurry seal layer disclosed in the invention to improve the anti-tracking performance of the maintenance road by 60 percent, the anti-cutting performance by 35 percent, the bonding performance and the waterproof damage property by 33 percent, the material collecting anti-dispersion performance by 30 percent, the anti low temperature crazing performance by 15 percent and the anti-fatigue performance by 15.6 percent.

The invention discloses a modified asphalt mastic resin applied in the field of water conservancy and hydropower project, and provides a preparation method and an application method of the modified asphalt mastic resin. The modified asphalt mastic resin comprises modified asphalt used as a matrix and ground alkaline rock mineral powder as filler, and the addition amount of the filler is 40-70%. The modified asphalt mastic resin is prepared by separately heating the modified asphalt matrix and the mineral powder and then uniformly mixing. When in use, the modified asphalt mastic resin is heated to 180-200 DEG C, simultaneously the surface of asphalt concrete for construction is cleaned, and then the modified asphalt mastic is brushed on the surface. The modified asphalt mastic resin has greatly improved anti-aging and anti-high-temperature slope flowing capabilities and low-temperature cracking resistance, and good adhesion with impermeable asphalt concrete under frost action. According to the construction method provided by the invention, the modified asphalt mastic resin can be brushed easily and evenly with few bubbles, convexes, needle holes and other defects.

The invention discloses a warm-mix asphalt additive and a preparation method thereof. The warm-mix asphalt additive is prepared from powdery solid, Fischer-tropsch wax, a branched high-molecular polymer and N,N'-ethylenebisstearamide, wherein the powdery solid is a solid product separated after oily sludge is treated by adopting an oil sludge heat extraction and dehydration technology. The components in the warm-mix asphalt additive have a synergistic effect, an additive synergism effect can be played, the mixing and forming temperature of a warm-mix asphalt mixed material prepared by applying the warm-mix asphalt additive is lower than 135 DEG C, the warm-mix asphalt additive has the advantage of obviously reducing the mixing and forming temperature, and the properties of the mixed material are equivalent to the properties of warm-mix asphalt.

The invention relates to the technical field of pavement construction, and concretely relates to a rock asphalt fluid fine grinding, modifying and mixing process. A rock asphalt fluid is prepared from the following components: 38 to 43 parts of rock asphalt, 22 to 30 parts of matrix asphalt, 16 to 23 parts of kieselguhr, 12 to 20 parts of sodium tetrapolyphosphate, 8 to 15 parts of kaolin, and 5 to 12 parts of surface active agent. According to the rock asphalt fluid fine grinding, modifying and mixing process provided by the invention, the sodium tetrapolyphosphate, the kaolin and the matrix asphalt are used as raw materials for preparing the rock asphalt, and the oil content in the rock asphalt is gradually oxidized and transformed into asphaltene, so that the viscosity of the rock asphalt is increased, and meanwhile, a high temperature performance of the rock asphalt is also improved; through the mixed use of the kieselguhr and the kaolin, the high-temperature stability and the low-temperature cracking resistance of the rock asphalt can be improved, so that a viscoelasticity range of the rock asphalt is increased, the temperature sensibility is reduced, and meanwhile, the ageing resistance and the fatigue resistance of the rock asphalt are improved.

The invention discloses an asphalt reinforcing agent and application of the asphalt reinforcing agent in modified heavy traffic asphalt. The asphalt reinforcing agent is prepared from raw materials: functional mineral powder and modified basalt fiber; and the functional mineral powder is modified serpentine and/or modified vermiculite. Compared with the prior art, the asphalt reinforcing agent isapplied to asphalt modification and can significantly improve the high-temperature stability and low-temperature anti-cracking property of asphalt, the modified heavy traffic asphalt can meet requirements of the use property of the road, and the service life of the road is prolonged.

The invention discloses a PPR pipe material resistant to low-temperature cracking, a preparation method of the PPR pipe material and a PPR pipe product prepared from the PPR pipe material. The PPR pipe material resistant to low temperature cracking is prepared from the following components in parts by weight: 100 parts of PPR, 10 parts of PPB, 0.05 to 0.1 part of beta nucleating agent, 3 to 5 parts of LLDPE (Linear Low Density Polyethylene) and 3 to 5 parts of color master batch, wherein the PPR pipe product is prepared from the PPR pipe material, and the preparation method of the PPR pipe product comprises the steps of forming, cooling and curing treatment. The PPB, the beta nucleating agent and the LLDPE are added for synergistic interaction, so that the problem of brittleness of PPR at low temperature is effectively improved, and the PPR pipe material with excellent low-temperature cracking resistance is obtained. By utilizing the PPR pipe material, through long-time curing treatment at a relatively low temperature, the intermolecular tension of each component in the PPR pipe material is effectively reduced, the stability of a crystal structure is enhanced, and the low-temperature cracking resistance of a PPR pipe product is further improved.

The invention provides a cooling type high-performance road marking hot melt coating for high-altitude areas and a preparation method thereof, and relates to the technical field of road marking materials. The cooling type high-performance road marking hot-melt coating for the high-altitude area comprises the following components in percentage by mass: 10-18% of a cementing material, 40-60% of a filler, 3-8% of a pigment, 15-23% of a reflective material, 0.5-3% of a plasticizer, 4-12% of an elasticizer, 1-4% of a rheological agent, 0.5-3% of a warm mixing agent and 0.5-2% of a light screening agent. According to the obtained cooling type high-performance road marking coating for the high-altitude areas, the ultraviolet resistance and the low-temperature cracking resistance can be remarkably improved on the premise that the good pavement performance of the road marking coating is maintained and effectively improved, and the cooling type high-performance road marking coating has important application and popularization significance in the high-altitude areas.

The invention provides modified emulsified asphalt concrete, and belongs to the technical field of road pavement construction. The modified emulsified asphalt concrete comprises the following components in percentage by mass: 4%-5% of asphalt, 5%-7% of slag powder, 40%-50% of fine aggregate, 40%-50% of coarse aggregate and 0.2%-0.8% of an anti-stripping agent, the asphalt is SBRII-A type modified asphalt, the fine aggregate is 0-4.75 mm machine-made sand, the coarse aggregate is 4.75-9.5 mm broken stone and 9.5-16 mm broken stone, and the doping amount of the 4.75-9.5 mm broken stone is higher than that of the 9.5-16 mm broken stone. The HY-1 type anti-stripping agent is added into the modified emulsified asphalt concrete, so that the adhesive force between asphalt and aggregate can be increased, the water damage resistance and thermal aging resistance of the asphalt concrete are improved, the possibility of forming oil flooding and pitted surfaces on a pavement is reduced, and the service life of the pavement is prolonged; by using the SBRII-A type modified asphalt, the influence of plateau day and night temperature difference on the asphalt pavement can be reduced, the low-temperature cracking resistance and the high-temperature rutting resistance are improved, and shrinkage cracks formed on the asphalt pavement are reduced or avoided.