35results about How to "Improve viscosity and toughness" patented technology

The invention provides modified high-viscosity asphalt and a preparation method thereof. The modified high-viscosity asphalt is prepared from, by mass, 88.6%-91.5% of pavement petroleum asphalt, 6.5%-8.5% of butadiene-styrene block copolymer, 1.0%-1.4% of low molecular weight polymer synthetic resin with the molecular weight of 1,480-2,200, 0.8%-1.2% of high molecular weight polymer synthetic resin with the molecular weight of 4,800-8,000 and 0.2%-0.3% of stabilizer. The modified high-viscosity asphalt has the advantage of being good in storage stability, the polymer resin which is slow in separation and is not degradable is used for compound modification, the toughness and visco-toughness of the modified pavement petroleum asphalt are good, the 60-DEG C dynamic viscosity is especially prominent, exceeds 110,000 Pa.S, and is far larger than that, being 60,000-80,000 Pa.S, of commercially available high-viscosity modified asphalt, and the anticorrosion performance is also good.

The invention discloses an SBR (styrene-butadiene rubber) modified asphalt and a preparation method thereof, and belong to the technical field of asphalt modification. Raw materials of the SBR modified asphalt comprise, by mass, 80-84.5% of matrix asphalt, 12-15% of aromatic oil and 3.5-5% of an SBR asphalt modifier, wherein raw materials of the SBR asphalt modifier comprise, by weight, 100 partsof a modified SBR emulsion (by dry rubber), 0.1-1 part of an antioxidant, 5-10 parts of an isolating agent, 3-6 parts of a dicyandiamide-formaldehyde condensate and 2-6 parts of potassium aluminum sulfate. The preparation method comprises the following steps: heating the matrix asphalt until melting, adding the aromatic oil and the SBR asphalt modifier, and shearing and swelling the obtained mixture to obtain the SBR modified asphalt. The SBR modified asphalt has good low temperature performances, ductility and bonding property, and has greatly improved viscosity, high temperature performancesand anti-aging property.

The invention provides a pavement structure of a steel bridge deck and a construction method thereof. the pavement structure of the steel bridge deck comprises a first waterproof bonding layer, a modified epoxy asphalt macadam layer, a second waterproof bonding layer and an ultra-high performance structural layer which are sequentially paved on the surface of a steel plate of the steel bridge deck; the ultra-high performance structural layer is a pavement structural layer taking polymer modified asphalt as an adhesive, or comprises a pavement structural layer taking the polymer modified asphalt as the adhesive and a third waterproof bonding layer; the second waterproof bonding layer and the third waterproof bonding layer are the layers formed by at least one material of epoxy emulsified asphalt, polymer modified asphalt and polymer modified emulsified asphalt. The pavvement structure of the steel bridge deck provided by the invention has better resistance and stability.

The invention discloses a high-solid-content emulsified asphalt for a stress absorbing layer, a preparation method and a construction method thereof. The high-solid-content emulsified asphalt is prepared from ordinary asphalt, asphalt additive, emulgator, modifier, water and pH regulator; the solid content is 67-75%; the raw materials by weight percent are as follows: 50-70% of ordinary asphalt, 1-12% of asphalt additive, 0.2-3.0% of emulgator, 2.0-10.0% of modifier and the balance of water and pH regulator. The preparation method comprises the following steps: heating ordinary asphalt; addingasphalt additive into ordinary asphalt at a ratio and uniformly stirring, thereby acquiring a mixture of ordinary asphalt and asphalt additive; preparing emulgator into an aqueous solution, and thenadding modifier, thereby acquiring an emulgator liquid soup; using pH regulator for regulating pH value of the emulgator liquid soup, and then heating; successively putting the emulgator liquid soup and the mixture of ordinary asphalt and asphalt additive into a colloid mill, and then milling, thereby acquiring an end product of emulsified asphalt. According to the invention, a synchronous macadamseal coat vehicle is adopted for spraying/spreading emulsified asphalt and macadam; a 'prime coat and stress absorbing layer' effect can be achieved through once construction; construction process isreduced; construction cost is lowered.

The invention discloses a high-toughness, durable and antiskid steel bridge deck pavement structure and a construction method thereof. The steel bridge deck pavement structure comprises a steel bridgedeck steel plate; a bonding bottom layer, a buffer layer, an adhesion layer and a wearing layer are sequentially laid on the surface of the steel bridge deck steel plate from bottom to top; the buffer layer and the wearing layer are both made of high-toughness modified asphalt concrete composed of aggregate, filler and asphalt cement, the thickness of the buffer layer is 1-3 cm, and the thicknessof the wearing layer is 2-3 cm. The bridge deck pavement structure has good high-temperature rut resistance, fatigue durability, skid resistance, bonding strength and deformation compliance, comparedwith epoxy asphalt concrete, the engineering cost is greatly reduced, the construction process is simple, and later maintenance is convenient.

The invention relates to a mixed feed for parent salamander breeding. The mixed feed includes the following components in parts by weight: 65 parts of fish meat, 5 parts of A starch, 9 to 17 parts of astragalus membranaceus, 3 to 6 parts of bighead atractylodes rhizome, 3 to 5 parts of radices sileris, 5 to 9 parts of semen cuscutae, 4 to 6 parts of herba epimedii, 4 to 8 parts of prepared rehmannia roots, 0.3 to 0.6 part of calcium hydrophosphate, 2 to 4 parts of algae powder, 1 to 2 parts of unsaturated fatty acid, 1 to 2 parts of bacillus subtilis, 0.3 to 0.6 part of L-lysine monohydrochloride, 0.05 to 0.1 part of zinc citrate, 0.05 to 0.1 part of organic iron, 0.1 part of vitamins, and 0.2 part of trace elements; the fish meat is the meat of one or more kinds of the following fishes: black carps, grass carps, chubs, bighead carps, crucians and wild fishes; the vitamins include VA, VB1, VB2, VB6, VB12, VC, VD and VE; the trace elements include 1 to 3 kinds of the following elements: zinc, iron and calcium. The mixed feed for parent salamander breeding can meet the nutritional requirements of parent salamanders, improve the immunity of the parent salamanders as well as the gonad maturity of the parent salamanders in breeding seasons, and strengthen the sperm motility of male salamanders.

The invention discloses a combined-type steel bridge deck laying method. The combined-type steel bridge deck laying method comprises the following steps that A, a modified epoxy resin and gravel combined-type connection layer is laid, specifically, the surface of a steel plate of a steel bridge deck is subjected to sandblasting shot blasting, modified epoxy resin is laid and smeared on the surfaceof the steel plate to form a first modified epoxy resin layer, gravel is scattered on the surface of the first modified epoxy resin layer to form a first gravel layer, modified epoxy resin is evenlylaid and smeared on the surface of the first gravel layer according to the set dosage to form a second modified epoxy resin layer, and then gravel is scattered to form a second gravel layer; and B, ultra-high performance pavement is laid, specifically, active epoxy asphalt or high-viscosity modified emulsified asphalt is smeared on the surface of the connection layer to form a first waterproof bonding layer, then a stone mixture is laid and smeared to form a waterproof-type structure layer, and finally integrated spreading of a second waterproof bonding layer and a drainage-type abrasion layeris conducted through special equipment. According to the combined-type steel bridge deck laying method, sliding and delaminating between the structural layers are prevented, and the stability and durability of the structure are guaranteed.

The invention discloses high-modulus modified asphalt and a production method thereof. The high-modulus modified asphalt comprises the following components in parts by weight: 70-80 parts of mixed road petroleum asphalt, 15-20 parts of anti-rutting master batch, 4-5 parts of SBS (Styrene Butadiene Styrene), 1-2 parts of polyethylene wax and 0.1-0.2 part of a stabilizer, wherein the mixed road petroleum asphalt is straight-run asphalt of which the needle penetration at 25 DEG C is 60-100 0.1 mm and the ductility at 10 DEG C is greater than 100cm; the asphalt mixture is formed by mixing two kinds of asphalt according to the mixing weight ratio of 2: (1-2). Two kinds of road petroleum asphalt are properly matched and mixed, then proper anti-rutting master batches, SBS and polyethylene wax are selected as auxiliary materials, and sulfur flakes are used as stabilizing agents, so that the prepared high-modulus modified asphalt has good high-temperature stability, viscosity and toughness, toughness and anti-rutting performance; the low-temperature performance index is also relatively good, and the characteristics of fatigue resistance, good aging resistance, high storage stability, low cost and simple preparation process are achieved.

The invention relates to the technical field of petrochemical engineering, in particular to high-performance rubber asphalt for an asphalt pavement and a preparation method thereof, and the high-performance rubber asphalt comprises the following raw material components: a low-wax asphalt matrix, SBS, a polyolefin modifier, waste rubber powder, diatomite and a sulfur modifier. Compared with the prior art, various modifiers are added into an asphalt matrix with low wax content, so that the comprehensive performance of the asphalt is greatly improved, the high-temperature storage stability, the high and low temperature performance, the aging performance, the viscoelasticity and the viscosity and toughness are obviously improved, and the use requirements of alpine regions or high-temperature regions are met.

The invention provides a method for researching a viscosity and toughness improvement mechanism of asphalt by graphene, which belongs to the technical field of asphalt performance enhancement, and researches a toughening mechanism of modified asphalt from the angles of binding energy of a two-phase interface and energy absorbed by fracture. The problem that evaluation is carried out only by qualitative judgment in a graphene modified asphalt toughening mechanism research method is solved. The method comprises the following steps of firstly, carrying out a viscosity and toughness test on an asphalt sample to obtain a viscosity and toughness curve and various mechanical property indexes, and analyzing through a calculation formula, then carrying out an impact resistance test and a fracture toughness test to obtain the impact absorbing energy, the borne maximum bending load and the fracture toughness of the asphalt sample under the room temperature condition, and observing the fracture notch morphology and the lattice image by using a scanning electron microscope and a transmission electron microscope, and finally, researching chemical bond change and interlayer spacing change before and after graphene is added by utilizing infrared spectroscopic analysis and X-ray diffraction test, thereby further revealing the improvement mechanism of the graphene on the viscosity and toughness of the asphalt.

The invention relates to the technical field of asphalt preparation, and discloses high-performance modified asphalt. The high-performance modified asphalt is prepared from the following components in parts by weight: 15-30 parts of auxiliary materials, 10-18 parts of a modifier, 50-100 parts of raw asphalt and 2-25 parts of a solvent. The invention also discloses a manufacturing method of the high-performance modified asphalt. The manufacturing method comprises the following steps: S1, crushing of the modifier: putting the modifier into a crusher for crushing for 10-30 minutes, and then conducting screening with a 200-to-400-mesh sieve to obtain the crushed modifier; and S2, dissolving of the modifier: adding the crushed modifier and a solvent into a mixing tank, and carrying out stirring and mixing to obtain a mixed solution A. By adding the modifier, the viscosity and toughness, the softening point, the low-temperature cracking resistance and the elasticity of the modified asphalt can be effectively improved; and by doping an anti-stripping agent and an anti-aging agent, the use performance of a pavement material can be improved, and the service life of the pavement material can be prolonged.