335 results about "Asphalt mortar" patented technology

The invention discloses a super-high early-strength grouting material for repairing a ballastless track structure of a high speed railway, which is prepared by the following steps of: sequentially adding water, polymer emulsion, a water reducing agent, a rheology accessory agent and an antifoaming agent; adding admixture, cement, an expansion agent, a coagulator and a retarder, and stirring and blending the materials at a high speed. The parts by weight of the ingredients are as follows: 100 parts of superfine cement, 50-150 parts of admixture, 25-50 parts of redispersible emulsion powder, 3-10 parts of polymer emulsion, 5-25 parts of expansion agent, 0.1-1.0 part of carboxylic acid water reducing agent, 0.1-10 parts of coagulator, 0.1-5 parts of retarder, 0.001-0.005 parts of rheology accessory agent, 0.001 part of polyether-siloxane copolymer antifoaming agent and 20-70 parts of water. The material disclosed by the invention has the advantages of low viscosity, super-high early-strength, low cost, fatigue resistance, aging resistance and water erosion resistance, and the like, so that the material can be used for repairing the concrete gaps of ballastless tracks of high speed railways, gaps of cement asphalt mortar filling layers, cracks and damages.

The invention relates to a semi-flexible pavement base material and a preparation method thereof. The semi-flexible pavement base material comprises 20-75% of an aggregate, 22-75% of cement-emulsified bitumen mortar and 1-8% of water. Through adjustment and optimization of composition and compatibility of the cement, emulsified bitumen and aggregate, an adhesion state and a molded structure of the cement, emulsified bitumen and aggregate are improved so that the semi-flexible pavement base layer structure has ideal rigidity and flexibility, rutting resistance and cracking resistance of the semi-flexible pavement base layer structure are improved and water damage resistance and fatigue resistance of the semi-flexible pavement base layer structure are improved. The semi-flexible pavement base material and the preparation method thereof are mainly used for building and refurbishment of high-grade roads and urban roads and are especially suitable for easily-rutted road sections such as heavy-loaded traffic roads, road intersections, uphill and downhill of a road, a bus stop and a bus transit lane.

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 invention discloses polymer cement mortar for a slab ballastless track of a high-speed railway. The polymer cement mortar a comprises a dry raw material and a liquid raw material, wherein the dry raw material comprises a binding material component, an elastic adjusting component, an expanding component, an internal curing component, an aggregate component and a coagulation adjusting component; the liquid raw material comprises a polymer emulsion, a water reducing agent, a defoaming agent, an air entraining agent and water; and the weight ratio of the dry raw material to the liquid raw material is 100:(15-25), and the dry raw material and the liquid raw material are uniformly mixed in a proportion to prepare the polymer cement mortar. The polymer cement mortar has the advantages of controllable coagulation time, high adhering strength, adjustable elastic modulus, good elasticity and toughness, high durability and the like, and is capable of replacing cement emulsified asphalt mortar to be applied to a packing material of the slab ballastless track or can be used as a quick repairing material of a filling layer of cement emulsified asphalt mortar.

The invention belongs to the modified emulsified asphalt field, and more specifically relates to a SBS polymer modified emulsified asphalt and a preparation method, the SBS polymer modified emulsified asphalt is prepared by the following raw materials by mass percentages: 40-65% of SBS polymer modified emulsified asphalt, 25-50% of water, 2-10% of cation asphalt emulsifier, 0.1-2.0% of composite emulsified stabilizing agent and 0.2-2.0% of acid, wherein SBS polymer modified asphalt is prepared by mixing and reacting a SBS polymer modifier and matrix asphalt, and the mass of the SBS polymer modifier accounts for 3.5%-5.5% of that of the SBS polymer modified asphalt. The prepared SBS polymer modified emulsified asphalt has stable property, and can be used as a cement asphalt mortar layer and the like for a road tack coat, a seal layer, surface treatment, a slurry seal layer and a high speed railway plate-type ballastless track.

A cement-emulsified asphalt mortar used for railway and overhead railway in urban area contains cement and its additive, emulsified asphalt, sand, water, water-reducing agent, aluminium powder, surfactant, defoaming agent, polyacrylic fibres and chlorobutadiene latex. Its preparing process is also disclosed. Its advantages are high flowability, high strength and freeze-thawing resistance, and no environmental pollution.

The invention provides cement-emulsified asphalt mortar and a preparation method thereof. The cement-emulsified asphalt mortar comprises the following components in part by weight: 110 to 160 parts of emulsified asphalt, 10 to 30 parts of polymer emulsion, 90 to 100 parts of cement, 150 to 250 parts of sand, 0 to 0.5 part of strength modifier, 0 to 10 parts of expanding agent, 0 to 1.0 parts of fiber, 0 to 0.05 part of cellulose, 0.004 to 0.015 part of aluminum powder, 0 to 0.1 part of defoaming agent, 0 to 1.2 parts of air entraining agent and 0 to 25 parts of water. The cement-emulsified asphalt mortar has good low-temperature resistance, and is suitable for the slab tracks of high-speed railways, passenger transport lines and urban high-speed light rails in severe cold areas.

The invention provides an emulsified asphalt, which has the compositions of bitumen, surfactant, additives and water, the content of each component as follows : Asphalt 22 -55% surfactant: cationic surfactant 1.0 - 15 %, non-ionic surfactant 1.0 -20%; auxiliaries 0.1-8%; cushion for water; the ratios are according to the percentage of weight.. The invention of products, in lines with its performance as 'People's Republic of China Ministry of Railways' plate ballastless track emulsified asphalt cement mortar CA technical conditions, ' In the practical use ,which is to avoid CA mortar (that is, cement -- Asphalt mortar) have Segregation and enable CA mortar have a appropriate time to fully meet the needs of the construction, so that the products of this invention can be effectively used for high-speed railway plate ballastless track in the CA mortar.

The invention discloses an asphalt mixture virtual performance test prediction method based on mesoscale simulation. The method comprises the steps of designing an initial mix proportion of an asphalt mixture, acquiring basic parameters of a material, carrying out a DSR test of asphalt mortar, carrying out a virtual creep test on the asphalt mortar, converting parameters in a virtual system, choosing multiple indoor tests needing to be predicted, constructing various three-dimension virtual test pieces, choosing a mechanic constitutive model of the material, choosing a loading condition of the virtual test, constructing a real-time monitoring system for test results, outputting final result prediction values of all the tests, comparing all indexes with standards to judge whether requirements are met, outputting suggesting to reselect a mix proportion if the requirements are not met, and outputting an optimal mix proportion if the requirements are met. According to the method, additional curves of the test results are monitored in real time, the obtained output results are compared to judge whether multiple performance indexes of the mixture to be predicted meet the standard requirements, unnecessary relative-property indoor tests are reduced, and test basis is provided for optimal design of the mix proportion of the asphalt mixture.

Cement, mixing agent, pitch emulsion, sand (1.90-2.10 portion), water, foaming agent, aluminium powder, AE agent and plasthetics emulsion are mixed by equitable selecting material and matching, compound pitch emulsion agent is added in to make sand aggregate not being separated and has elasticity and excellent vibration strength since that small quantity of nonion polymer is mixed in compound pitch emulsion agent.

The invention provides anionic emulsified asphalt and a preparation method thereof. The cement emulsified asphalt comprises the following components in percentage by weight: 55 to 65 percent of asphalt, 0.5 to 5 percent of anionic surfactant, 0.02 to 4 percent of aid, and the balance of water. The anionic surfactant can be one of tall oil sulfonate, alkyl sulfonate, alkylbenzene sulfonate, alkyl sulfate and lignosulfonate. The emulsified asphalt provided by the invention has the advantages of good storage stability, wide temperature adapting range, good adaptability with cement, good compatibility and the like; and the cement emulsified asphalt mortar prepared by using the emulsified asphalt has good flow property, long service life and wide temperature adapting range, does not produce dissociation or lamination, has excellent physical and mechanical properties, and fully meets the requirement of construction, so that the emulsified asphalt can be effectively used for the cement emulsified asphalt mortar in plate type ballastless tracks of high speed railways.

The invention relates to a CA mortar material with high shock absorption performance for intercity high-speed railways and city subways, in particular to a CA mortar material with low elastic modulus, which is prepared by mixing and stirring the following raw materials in portions by weight: 1 portion of cement, 0.4-2.5 portions of emulsified asphalt, 0.01-3.5 portions of sands, 0.01-0.4 portion of expanding agent, 0-0.01 portion of defoaming agent, 0.00003-0.003 portion of air entraining agent, 0.001-0.1 portion of water reducing agent, 0-0.8 portion of water, 0.00001-0.001 portion of aluminum powder and 0.01-0.4 portion of rubber particle, wherein the rubber particle is rubber treated by an interfacial treatment agent, and the particle diameter is 0.5-3 millimeters. The CA mortar material with low elastic modulus, which is provided by the invention, can reduce the elastic modulus of the CA mortar and improve shock absorption and shock insulation effects.

The invention provides a track slab fine adjustment method for China railway track system (CTRS) I-type ballastless track laying. A CTRS I-type ballastless track comprises a base (5), cement emulsion asphalt mortar (4), a track slab (3) and a steel rail which are stacked with one another from top to down, and fasteners (2) which are fixed in bolt holes in the track slab and used for fastening the steel rail and convex flanges (6) positioned between longitudinal ends of the track slab. The method comprises the following steps of: establishing a control point (CP) III point control network according to a provided CP I and a provided CP II; arranging a track slab reference point (GRP) positioned in the center of each convex flange (6) according to the CP III; placing a measurement standard frame with a prism on the track slab to be measured; arranging a universal theodolite measurement station at the GRP of the track slab; and measuring the prism through a universal theodolite and finely adjusting the track slab according to the measured data. The invention also relates to a CTRS I-type ballastless track laying method.

The invention relates to a method for evaluating the damage self-healing capacity of asphalt mortar. The method includes stretching an asphalt mortar test piece in two directions at constant temperature under the condition that the strain rate is equal; monitoring stress and displacement data in a stretching and self-healing process in real time; and analyzing the data via a computer to obtain a self-healing coefficient of the asphalt mortar test piece. The method has the advantages that the self-healing capacity of the asphalt mortar can be quantitatively evaluated, influence of different factors such as self-healing time, self-healing temperature, self-healing pressure and asphalt damage degree before self-healing on self-healing effects of asphalt materials can also be tested, the method can be applied to asphalt mortar materials with different proportions, is simple and feasible, operation is easy, and a guiding foundation for optimally selecting and optimally designing materials of sustainable asphalt pavements is laid.

The invention discloses emulsified asphalt and a preparation method thereof. The emulsified asphalt comprises the following components in percent by weight: 60 to 65 percent of asphalt, 1.0 to 4.0 percent of complex emulsifier, 0.04 to 0.4 percent of stabilizing agent, 0.05 to 0.2 percent of thixotropic agent, 0.1 to 4 percent of aid and the balance of water. The emulsified asphalt for CRTS II type slab ballastless track cement-emulsified-asphalt mortar solves the main problems of poor stability, short available time, poor temperature adaptability, easy delamination and the like of the emulsified asphalt in the prior art. By adopting technology of complexing the emulsifier, various stabilizing agents are added, so the emulsified asphalt has the advantages of good emulsifying effect, good storage stability, good temperature adaptability of prepared cement-emulsified-asphalt mortar, long available time and no delamination, and can completely meet the requirement of cement-emulsified-asphalt mortar for ballastless track cushion of high speed railways.

The invention relates to emulsified asphalt for longitudinal connecting plate type ballastless track cement emulsified asphalt mortar. The emulsified asphalt comprises the following components in percentage by weight: 60 to 65 percent of asphalt, 0.2 to 5 percent of anionic emulsifier, 0.02 to 3 percent of stabilizing agent, 0 to 4 percent of assistant, and the balance being water; and the wax content of the asphalt is less than or equal to 2.2 percent. The emulsified asphalt for the longitudinal connecting plate type ballastless track cement emulsified asphalt mortar has good emulsifying effect, is not only suitable for storage and usage under normal temperature environment, but also suitable for storage and usage under the environment of lower temperature or higher temperature, and has the advantages of good storage stability, strong temperature adaptability and the like; and the cement emulsified asphalt mortar prepared by the emulsified asphalt has the advantages of long working time, large temperature adapting range, no layering, good filling property, good physical-mechanical properties, good durability, and the like. The emulsified asphalt is applied to a plate type ballastless track, and in particular the longitudinal connecting plate type (CRTS II type) ballastless tracks of high-speed railways and passenger dedicated lines.

The invention discloses a low-temperature cured epoxy asphalt mortar and a preparation method thereof. The epoxy asphalt mortar comprises the following components in percentage by weight: 10-20% of refined bitumen, 5-15% of epoxy resin, 5-10% of solubilizer, 40-70% of aggregate and 3-10% of curing agent. The low-temperature cured epoxy asphalt mortar has simple preparation process, low equipment requirement and low use cost, can be constructed and cured at normal temperature, not only is convenient to construct, but also has low requirement for equipment and is convenient to popularize and apply.

The invention relates to the technical field of engineering construction and maintenance, in particular to an epoxy resin emulsified asphalt mortar coating which can be widely applied to the fields of surface water prevention, crack pouring, leakage mending, bonding, thermal insulation, freeze prevention, heat insulation, noise reduction and the like of highways, bridges and buildings, and is prepared by the following procedures: using double-component emulsified asphalt (containing 30-70 percent of solid asphalt) containing 10-60 percent of modified epoxy resin as the bonding and film forming material of the coating, adding 3-15 percent of hollow glass beads, adding 5-30 percent of aqueous epoxy resin curing agent and blending the mixture uniformly, and then adding ore sand or high-strength quartz sand (with particle size of 3-80 meshes) accounting for 100-200 percent of the total amount of the mixture into the improved epoxy resin emulsified asphalt mortar coating. The epoxy resin emulsified asphalt mortar coating has the advantages that the viscosity is low and the permeability is good; the ductility and the flexibility as well as the fatigue resistant strength of a condensate are great; and a coating formed after curing does not dissolve or stick the tire; the compression resistance, the water leakage prevention capability and the wear resistance of the road surface are improved, the friction coefficient of the road surface is increased, and the capabilities of noise reduction, heat insulation and frost crack prevention of the road surface are enhanced.

Provided is a prediction method of cement asphalt mortar compressive strength. The method aims at shortening an ensured cement asphalt (CA) mortar proportioning cycle, and through a mechanism study and an experimental analysis, parameters which can hardly affect the strength are emitted. A mass ratio mW/mC of water use amount and cement use amount and a mass ratio mA/mC of asphalt use amount and the cement use amount are used as calculating parameters which finally can be used for quantitatively calculating the compressive strength of the CA mortar. According to the method, through utilization of the parameters provided by the CA mortar mix ratio, 28d compressive strength of the CA mortar can be conveniently and quickly predicted, and a prediction result has good reliability.

The invention relates to a method for characterizing the degrees of miscibility of old and new asphalt based on dynamic moduli of mixtures. The method includes the steps that various performance indexes of RAP materials, matrix asphalt, aggregates and mineral powder are tested; hot mixing regenerated asphalt mixtures and specimens are prepared according to a current regeneration norm; the dynamicmodulus of each specimen is tested and a principal curve of the actually measured dynamic moduli is drawn; asphalt mortars with different degrees of miscibility of the old and new asphalt are preparedby adding different addition amounts of old asphalt and regenerating agents into the matrix asphalt; DSR tests are carried out on the different asphalt mortars to measure composite moduli and phase angles of the asphalt mortars; the dynamic moduli of the mixtures with different asphalt mortar states is predicted and the predicted principal curve of the dynamic moduli is drawn; and the degrees ofmiscibility of the old and new asphalt in regenerated mixtures are characterized. According to the method for characterizing the degrees of miscibility of the old and new asphalt based on the dynamicmoduli of the mixtures, the method of performance indirect testing with the greatest controllability is selected for research, influences of mixing factors, human errors and mineral aggregate gradation are eliminated as far as possible, and the test precision is improved.