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166results about How to "Improve crack resistance" patented technology

Welding wire and method for welding the aluminum and aluminum alloy and steel

InactiveCN101284339AImprove crack resistanceSuppresses the formation of intermetallic compoundsArc welding apparatusWelding/cutting media/materialsAlloy elementElectric arc
The invention discloses a welding wire and a method for applying the welding wire on aluminum and aluminum alloy to be welded with steel. The welding wire (3) takes Al-Si solder as matrix, and then alloying elements of Cu, Mn, Zn and microelements of B, Zr and La are added to form a dedicated welding wire. The method comprises the following steps: K-shaped divided edges are formed on both ends of the aluminum and aluminum alloy (5); the angle of the divided edges is 50 plus or minus 5DEG C; a divided edge of 30 plus or minus 5 and a truncated edge of 1.0-2.0mm are formed on the side of a steel piece (4); the steel piece (4) is fixed on a chucking tool with a cooling device; the butt clearance between the aluminum and aluminum alloy (5) and the steel piece (4) is 1.0-2.0mm; a small-scaled pulse AC TIG welding method is adopted for single-side welding to realize double side shaping; a tungsten electrode (2) is hemispherical; the nozzle (1) of a welding gun is inclined to the aluminum side; and the welding wire (3) is continuously fed. The method can successfully realize the effective and fine quality connection of the aluminum and the dissimilar steel material by electric arc braze welding without clad layer, and has the advantages of simple operation, low welding cost, and stable and reliable welding process.
Owner:HARBIN INST OF TECH

Flux-cored wire for master cable energy forced shaping, and preparation and application method thereof

The invention relates to the field of metal welding materials, especially a high-efficiency flux-cored wire for master cable energy forced shaping, and a preparation and application method thereof. The flux-cored wire comprises an outer steel belt sheath and a filling and welding flux, wherein the filling and welding flux is prepared from the following components in percentage by mass: 0.03-0.06% of C, 0.25-0.70% of Si, 1.3-2.0% of Mn, 0.1-0.7% of Ni, 0.1-0.4% of Mo, 0.01-0.1% of Ti, 0.003-0.01% of B, 0.01-1.1% of Mg, at most 0.1% of Al, 5-10% of slag former, and the balance of Fe and inevitable impurities; and the filling and welding flux in the flux-cored wire accounts for 15-25% of the total mass of the flux-cored wire. The flux-cored wire has the advantages of strong adaptability, wide range of adoptable welding technology, adjustable composition, high melting rate, smooth welding process, less dust, favorable slag detachability, favorable flowability and fewer generated bubbles; and due to the reasonable addition of iron powder, the flux-cored wire enhances the welding deposition efficiency, ensures the low-temperature toughness of the welding seam, and obtains excellent comprehensive mechanical properties.
Owner:ADVANCED TECHNOLOGY & MATERIALS CO LTD

Hydration heat suppression type expansion fiber composite anti-cracking agent and preparation method thereof

The invention discloses a hydration heat suppression type expansion fiber composite anti-cracking agent, which comprises, by mass, 93.5%-98% of an expansion component, 1.5-6% of a hydration heat suppression component, and 0.5-1.5% of basalt fiber, wherein the expansion component is prepared by compounding a light burning magnesium-based expansion agent and a calcium-based expansion agent accordingto a mass ratio of 1:10-10:1, and the hydration heat suppression component is prepared by compounding an ester compound and a retarder according to a mass ratio of 1:1-5:1. The preparation method ofthe hydration heat suppression type expansion fiber composite anti-cracking agent comprises: pre-mixing the light burning magnesium-based expansion agent, the calcium-based expansion agent and the basalt fiber, adding the hydration heat suppression component, and completely mixing. According to the present invention, the prepared hydration heat suppression type expansion fiber composite anti-cracking agent can effectively reduce the temperature increase of the concrete hydration reaction, and can compensate the shrinkage from the early stage and the middle-late stages of the concrete so as tosignificantly reduce the temperature crack of the concrete and enhance the crack resistance of the concrete; and the preparation method is simple, can be widely applied, and has the production cost.
Owner:贵州鼎盛建材实业有限公司

Ultra-high performance concrete material containing coarse aggregates and preparation method of ultra-high performance concrete material

InactiveCN107473658AHigh elastic modulusImprove crack resistanceElastic modulusHigh performance concrete
The invention discloses an ultra-high performance concrete material containing coarse aggregates and a preparation method of the ultra-high performance concrete material. The material is mainly prepared from cement, water, a water reducing agent, admixture, sand, the coarse aggregates and steel fibers. The ultra-high performance concrete material containing the coarse aggregates is prepared according to the following steps: firstly, weighing all the raw materials according to the proportions; secondly, adding the cement and the admixture into a mixer, uniformly stirring, then adding the sand and the coarse aggregates, and carrying out dry mixing to obtain a mortar mixture; thirdly, uniformly stirring part of water and all the water reducing agent in advance, then adding the mixture into the mortar mixture for stirring, and adding residual water to obtain mixed slurry; fourthly, spreading the steel fibers into the mixed slurry, and uniformly stirring to obtain the ultra-high performance concrete material containing the coarse aggregates. The ultra-high performance concrete material containing the coarse aggregates has the advantages of good flowing property, high strength, high elastic modulus, high bending resistance and excellent fatigue property.
Owner:SOUTHEAST UNIV

Important component of crack-resistant insulated flame-retardant building material coating

The invention discloses an important component of a crack-resistant insulated flame-retardant building material coating. The important component is characterized in that nanosilicon dioxide and a graphene microchip are added to an insulated flame-retardant coating, wherein the nanosilicon dioxide accounts for 1%-5% of the weight of basic components of the insulated flame-retardant coating; the graphene microchip accounts for 0.5%-5% of the weight of the basic components; the crack resistance of the coating is improved by adding two inorganic non-metallic materials, namely the nanosilicon dioxide and the graphene microchip; crystal is grown and generated from the graphene microchip in a three-dimensional cellular way (same as a diamond mine); four valence electrons of each carbon atom form covalent bonds to be bound, cannot form electron flow in directional movement, and cannot conduct electricity; generated graphite carbon crystal is ground in a single direction in a wet nano-grinding manner, so as to generate the graphene microchip of which the thickness is in a nanometer scale and the area is in a micron scale; due to the addition of the graphene microchip into the coating, the fusion performance of the coating can be greatly improved; and the coating has good crack resistance.
Owner:ANHUI HUAQIANG WATERPROOFING PRESERVATIVE MATERIAL CO LTD

Composite anti-cracking agent for super-long mass concrete and preparation method of composite anti-cracking agent

ActiveCN113213807AImprove crack resistanceImprove the effect of compensating shrinkageSolid waste managementMagnesiumZeolite
The invention discloses a composite anti-cracking agent for super-long mass concrete and a preparation method of the composite anti-cracking agent. The composite anti-cracking agent is prepared from the following raw materials: 60%-70% of an expansion component, 10%-20% of a hydration heat regulating component, 10%-20% of a composite admixture, 5%-10% of a water reducing component and 0.5%-1.0% of anti-cracking fibers. The expansion component is formed by mixing a calcium expansion component and a magnesium expansion component, and the composite admixture is prepared from the following raw materials: calcined diatomite, active zeolite powder and phosphorus slag powder. The hydration heat regulating and controlling component is prepared by modifying beta-cyclodextrin. The invention also provides a preparation method of the composite anti-cracking agent. The concrete shrinkage can be effectively compensated in the whole course, the concrete temperature rise rate is reduced, the concrete cracking risk is reduced, the impervious performance and durability of the concrete are improved, the influence on the setting time is small, and the later strength of the concrete is not influenced; and the composite anti-cracking agent is especially suitable for building engineering with high cracking risk, such as mass concrete, side wall and bottom plate concrete and high-strength concrete.
Owner:SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS

Waterproof sealing system for high-speed railway bridge deck in severe cold area and construction method of waterproof sealing system

The invention discloses a waterproof sealing system for a high-speed railway bridge deck in a severe cold area and a construction method of waterproof sealing system. The waterproof sealing system comprises a protecting wall outside cable duct waterproof system and a between-cable waterproof system and is characterized in that the protecting wall outside cable duct waterproof system comprises a waterproof coating layer and a fiber reinforced concrete protecting layer; the between-cable waterproof system comprises a waterproof coil layer and a fiber reinforced concrete protecting layer. The waterproof sealing system has the advantages that the waterproof coil and C40 fine-stone fiber reinforced concrete are composited to serve as the structure waterproof sealing layer, and the crack resistance and freezing resistance of the concrete are increased; a self-made paving machine is used to perform coil paving to guarantee coil adhering density and increase the effect; a vibration platform isused to perform deck ultrathin glass fiber waterproof concrete pouring, a drainage slope is formed in one step, and cracking after construction is prevented effectively.
Owner:中铁二十二局集团第一工程有限公司 +1

Prestressed composite superimposed large-diameter tube pile and manufacturing method thereof

ActiveCN102337742AExcellent impact resistance and durabilityImprove crack resistanceCeramic shaping apparatusBulkheads/pilesSteel tubeSteel plates
The invention provides a prestressed composite superimposed large-diameter tube pile and a manufacturing method thereof. The tube pile is characterized in that tube sections adopt an ultra high performance fiber reinforced cementitious composite (UHPFRC) as a substrate; ultra high toughness cementitious composite (UHTCC) crack-control protective layers are arranged outside the UHPFRC; a steel plate hoop is arranged on the periphery of the top of the tube section at the top of the pile; a flange plate is arranged at the bottom end of the tube section at the bottom of the pile; spiral stirrups are arranged in tube walls and preserved ducts are arranged in the tube walls; the tube sections are spliced into a whole by tensioning longitudinal prestressed tendons passing through the preserved ducts; the preserved ducts are densely filled by injecting cement paste after the longitudinal prestressed tendons are tensioned; steel tube pile tips are connected with the flange plate of the tube section at the bottom of the pile by welding; and stiffening plates are arranged at the intersections of the steel tube pile tips and the flange plate. According to the invention, the ductility, impact toughness and durability of the tube pile are fully improved.
Owner:浙江固邦新材料有限公司

Recycled concrete and preparation method thereof

ActiveCN111943575AImprove crack resistanceGood cross-linking effectSolid waste managementWater reducerPolypropylene fiber
The invention discloses recycled concrete and a preparation method thereof. The recycled concrete comprises construction waste recycled coarse aggregate, stones, cement, a mineral admixture, an excitant, a water reducing agent, fibers and water, wherein the fibers comprise modified polypropylene fibers and plant fibers, and the modified polypropylene fiber modification process comprises the following steps: adding polypropylene fibers into an oxidant, mixing, soaking, washing to obtain a first intermediate product, adding the first intermediate product into a coating material, and uniformly mixing to obtain modified polypropylene fibers. The preparation method of the recycled concrete comprises: uniformly mixing a mineral admixture, cement and an excitant, adding water accounting for 1/3-1/2 of the total weight, and uniformly mixing to obtain a first intermediate product; uniformly mixing construction waste recycled coarse aggregate, the modified polypropylene fiber and plant fiber toobtain a second intermediate product; and uniformly mixing a water reducing agent, the first intermediate product, the second intermediate product, stones and the balance of water to obtain the recycled concrete. The anti-cracking performance of the recycled concrete is good.
Owner:陕西新意达建材产业发展有限公司

Method for filling hinge joint of fabricated prestressed hollow beam slab

The invention provides a method for filling a hinge joint of a fabricated prestressed hollow beam slab, and belongs to the technical field of bridge engineering. The method comprises the steps as follows: inserting a screw type blocking strip into a bottom gap of the hinge joint, wherein the top surface of the screw type blocking strip comprises two split parts, one part is lapped on the other part, the length of the lapping position is 3-5 cm, and rubber strips are arranged on wing plates on the two sides of the screw type blocking strip; filling the middle of the hinge joint with micro-expansion concrete; when the concrete of the hinge joint reaches enough age period, filling the top of the hinge joint with bituminous grout; and when the bituminous grout reaches the design performance, pouring a pavement layer on the top surface of the hollow beam slab. When the micro-expansion concrete is poured, the top surface of the screw type blocking strip is open, so that the space of a vertical column is communicated with that of the hinge joint and the screw type blocking strip is stabilized by the rubber strips on the wing plates and the self weight of the concrete of the hinge joint; and the middle of the hinge joint is filled with the micro-expansion concrete, so that the space of the hinge joint is closed for a long time and the problem of water seepage due to premature failure of the hinge joint is solved.
Owner:山东畅通路桥科技股份有限公司 +3
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