80results about How to "Guaranteed crack resistance" patented technology

The invention discloses a 900MPa high-strength steel preheating-free combined welding method. 700-800 MPa low-hydrogen type high-tenacity shielded metal arc welding is adopted for backing welding, then a 900MPa high-tenacity solid wire is matched with Ar+CO2 mixed gas shielded welding for implementing filling welding, and a 800MPa flux-cored wire is matched with CO2 gas shielded welding for cosmetic welding. A crack-free welding joint can be obtained by welding 900MPa high-strength steel through adopting a preheating-free and postweld heat treatment free combined welding process, and a joint region is smooth and clean, and can meet operating requirements on a high-strength steel welding structure for higher bearing capacity because the room temperature tensile strength of weld metal is more than 860MPa and the damping power of a V-shaped notch of the weld metal with the test temperature of 0 DEG C is more than 90J; and meanwhile, the method has welding cost reduced by about 25 percent, simple and convenient operation and easy popularization.

The invention provides putty powder used for walls in a house. The putty powder comprises the following ingredients: ground calcium carbonate, sodium-base bentonite, 1788 powder of polyving akohol, hydroxypropyl methyl cellulose and talcum powder, besides, white cement or/and calcium hydroxide powder is/are added therein as a reinforcing material, and also, sodium hexametaphosphate powder and/or tourmaline powder are/is added in the product. The putty powder has excellent scraping construction performance, long-acting mould-proof performance and excellent dense degree of the putty coating as well as the function of releasing negative ions for a long time, can effectively adsorb various harmful substances in the air and purify the air, and has excellent environment-friendly performance.

The invention discloses a method for improving the performance of a large-power high-light-transmittance LED packaging epoxy resin composition. The composition is composed of a component A and a component B. The composition has excellent UV resistance and yellowing resistance. The composition is advantaged in good manufacturability, good light transmittance, and low light failure. The composition can be used in white-light and blue-light LED packaging. Compared with organosilicon, the composition is advantaged in low price. Innovatively, the component A of the composition is composed of liquid cycloaliphatic epoxy resin, solid cycloaliphatic epoxy resin, and hydrogenated bisphenol A epoxy resin. An anti-forming agent, a color complementary agent, and a dispensing agent are adopted in auxiliary. The system does not contain benzene ring, and yellowing is not easy to occur. The component B is prepared through the steps that: methyl hexahydrophthalic anhydride and hexahydrophthalic anhydride are subjected to a polymerization reaction with promoting agents or cationic initiators such as quaternary phosphonium salt, quaternary ammonium salts, DBU salt, and imidazole; with added phosphate antioxidant, a thermal yellowing capacity is improved. With the applications of an ultraviolet absorber and a light stabilizer, a UV yellowing resisting effect is further improved.

The invention provides a method for constructing a connection joint between a flat slab and a post cap in a reverse construction method, and relates to the technical field of concrete supporting components. The method aims to solve the problems that in the prior art, a flat slab and a post cap are poured and constructed successively, accordingly, shrinkage cracks are prone to being formed a connection joint, bearing capacity, rigidity and punching-resistant capacity of the flat slab are reduced, reverse construction operations are extremely inconvenient and operation efficiency is reduced. The method includes the following steps that firstly, an upper-layer steel bar and a lower-layer steel bare of the flat slab to be poured and an embedded steel bar, a horizontal hoop rib and radial inclined ribs of the post cap to be poured are distributed surrounding a reserved steel column; a formwork is erected, concrete is poured, the formwork is dismantled after the concrete is hardened, and the flat slab and the post cap, which are connected into a whole, are manufactured. Through the method, the flat slab and the post cap can be poured to form a whole and are connected more tightly, the punching-resistant requirement can be met and stress performance of the connection joint is improved.

The invention relates to a ''composite waterproof adhesive layer and a preparation method thereof'', and belongs to the technical field of road construction. The composite waterproof adhesive layer comprises the following three structural layers from bottom to top: a glass fiber geogrid layer, a rubber asphalt layer and a single grain diameter gravel layer; the glass fiber geogrid is formed by bidirectional warp knitting, the longitudinal and transverse tensile strength at break in each linear meter is not less than 25kN/m, and the longitudinal and transverse elongation at break is not more than 4 percent; the rubber asphalt is high-viscosity asphalt, and the spray value is 2.0 to 2.6kg/m<2>; and the grain diameter range of the single grain diameter gravel is 13.2 to 19 millimeters, the single grain diameter gravel exceeding the grain diameter range is not more than 10 percent, and the spread area is 60 to 85 percent. The composite waterproof adhesive layer has strong bonding capacity with an upper bearing layer or a lower bearing layer, can integrally improve the adhesion and the waterproof performance among pavement structure layers, and obviously improves the integral cracking resistance of the pavement structure.

The invention discloses a method for preparing interior wall putty powder from semi-dry desulfurization ash. The method is characterized by including steps: screening the semi-dry desulfurization ash through a square-hole sieve; mixing, by weight, 80-100 parts of the semi-dry desulfurization ash, 0-20 parts of white cement or ash calcium powder, 0.8-5 parts of redispersible latex powder, 0-0.2 part of polyvinyl alcohol, 0.3-0.35 part of hydroxypropyl methyl cellulose ether and 0.02-0.05 part of starch ether, and stirring for 5-10min. The semi-dry desulfurization ash can be used as a raw material of the interior wall putty powder only by screening treatment without calcining, drying and grinding, and accordingly procedure simplicity, easiness in operation, low energy consumption and effectiveness in control of production cost are realized. In addition, with a small amount of inorganic cementing material or without the same, the semi-dry desulfurization ash is taken as filler with a small amount of additives to prepare the interior wall putty powder, so that the semi-dry desulfurization ash can be used effectively and substantially to realize recycling of the semi-dry desulfurization ash.

The present invention provides a block polyether, an air entrained type polycarboxylate water reducing agent prepared by the block polyether and a preparation method thereof, the air entrained type polycarboxylate water reducing agent not only has excellent work performance, also has the function of improving the air content in concrete, can not only avoid the a series of compatibility problems caused by compounding with an initiator, also can replace a calcium lignosulphonate water reducer and can ensure the concrete strength and anti cracking performance. In addition, due to the polyether special block structure, the air entrained type polycarboxylate water reducing agent has surface activity different from that of unsaturated polyglycol ether, and can be soluble in an aqueous solution so as to avoid the occurrence of delamination and other situations.

The invention discloses a simply-supported slab bridge jack-up method and a height-adjustable combined cushion structure applied therein. The simply-supported bridge jack-up method includes: firstly, setting up distributive girders under a girder, arranging jacks and putting up temporary supports, and then entirely synchronously jacking up a simply-supported slab to the height 1-3mm higher than design elevation; preliminarily supporting the bridge by the aid of the height-adjustable combined cushion structure and supports prior to performing zero-clearance girder falling to the designed elevation, and then demounting the jacks and the temporary supports. The height-adjustable combined cushion structure comprises a precast portion composed of precast supports and a height-adjustment combined mechanism capable of adjusting the height of the precast supports and a cast-in-situ portion coating a height-adjustable mechanism and part of the precast supports. The simply-supported slab bridge jack-up method and the height-adjustable combined cushion structure applied therein have the advantages of high applicability, controllable security, high construction precision, high operability, high economical efficiency, good application prospect and the like, thereby being capable of being used in support replacement projects of expressways and the bridges of urban roads and especially applicable to jack-up engineering when jack-up height of a sole-across simply-supported girder (slab) is larger than the stroke of one jack.

The invention discloses a stainless steel welding electrode with low magnetic permeability and a preparation method thereof. The welding electrode of the invention is composed of an H06Cr21Ni10 welding core and a coating. The coating comprises components according to the following weight percentages: 45 percent to 53 percent of TiO2, 10 percent to 13 percent of CaCO3, 10 percent to 13 percent of CaF2, 0.6 percent to 1 percent of alkali powder , 5 percent to 7 percent of quartz, 2 percent to 3 percent of talc, 6 percent to 8 percent of chromium metal, 7.5 percent to 8.5 percent of manganese metal, 2.8 percent to 3.6 percent of metallic nickel and 1 percent to 2 percent of Cr2O3. The weld metal of the welding electrode of the invention has low magnetic permeability, meets the required mechanical properties and can be used for welding stainless steel structures of 1Cr18Ni9Ti and 0Cr18Ni9 with low magnetic permeability. The price of the welding electrode is considerably lower than that of the existing stainless steel welding electrode E310-16 with low magnetic permeability. The welding electrode of the invention has welding technological properties and mechanical properties of weld metal which are similar to the existing E308-16 stainless steel welding electrode, thereby being convenient for wide application.

The invention relates to novel energy-saving thermal insulation mortar, which is prepared from the following components in parts by weight: 45 to 53 parts of ordinary Portland cement, 8 to 10 parts of wollastonite, 6 to 8 parts of vermiculite power, 12 to 15 parts of ceramic polished waste residue, 15 to 18 parts of vitrified light hollow microsphere, 8 to 10 parts of fly ash hollow cenosphere, 4 to 6 parts of alumina bubble, 2 to 3 parts of lignin fibre, 2 to 3 parts of polyvinyl alcohol fibre, 1 to 1.5 parts of sucrose fatty acid ester, 4 to 5 parts of hydroxypropyl guar gum, 1 to 1.5 parts of sodium dehydroacetate, 2 to 3 parts of strontium carbonate and 3 to 4 parts of poly carboxylic acid water reducing agent. The novel energy-saving thermal insulation mortar disclosed by the invention is prepared by adopting a special formula and an optimized proportion; waste, such as the ceramic polished waste residues, is utilized, and an excellent comprehensive performance index is achieved; the novel energy-saving thermal insulation mortar is ensured to have an unexpected thermal insulation effect and a crack resistance effect, and is very suitable for various building thermal insulation projects with high requirements.

The invention discloses fluidized roadbed soil and a construction method. The fluidized roadbed soil comprises the following raw materials, in parts by weight: 90-110 parts of residue soil, 10-30 parts of cement, 50-80 parts of water, 0-20 parts of fine gravel, 0-5 parts of a foaming agent, 0-10 parts of soluble foam particles, 0-5 parts of a retarder, 0-15 parts of bentonite, 0-10 parts of straw fibers, 0-5 parts of nano silicon oxide, 0-2 parts of basalt fibers, 0-5 parts of nano calcium carbonate, 0-5 parts of nano magnesium oxide, 5-10 parts of perovskite, and 2-5 parts of ammonium chloride. The fluidized roadbed soil is obtained by the steps of mixing the above raw materials, performing sieving, performing mud scattering and the like. The fluidized roadbed soil provided by the invention has the following advantages: the fluidized roadbed soil has a wide application range: the fluidized roadbed soil is in a flowing state and has no special requirements for formation flatness; the fluidized roadbed soil has good water permeability: the fluidized roadbed soil has good water permeability, the water permeability coefficient can reach 12 m/s<-4>, and a water body can be dispersed more quickly; the fluidized roadbed soil has high strength: the unconfined compressive strength under fluidity of 185 reaches 362 kPa; and the fluidized roadbed soil is convenient for construction and has high economic benefits.

A texture paint decoration prefabricated coiled material for an exterior wall of a building comprises an organic polymer non-woven fabric bearing layer, a toughness base material layer is arranged on the organic polymer non-woven fabric bearing layer, a waterproof base coat layer is sprayed on the toughness base material layer, a texture paint main paint layer is arranged on the waterproof base coat layer, and a finish-coat paint layer is arranged on the texture paint main paint layer. A method for preparing the texture paint decoration prefabricated coiled material for the exterior wall of the building includes the following steps that (1) the toughness base material layer is prepared, wherein powdery matter is metered and sequentially added according to sequences of quartz sand with the number of meshes ranging from 80 to 150 in per square inch, sub-nanometer ferronickel blast furnace slag ultrafine powder, 52.2 R Portland cement and hydroxypropyl methyl cellulose, stirring begins to be carried out from the moment when the powder is added, and stirring is conducted for another 4-6 minutes after the hydroxypropyl methyl cellulose is added; emulsion A is added to the mixture and stirred for about 3-5 minutes, then emulsion B and a proper amount of water are added and stirred for 6-8 minutes, and toughness base material mortar suitable for being sprayed and rolled is prepared.

The invention provides a functional terrace dividing strip and a construction method thereof. The functional terrace dividing strip is prepared from 300-400 parts of cement, 60-80 parts of inorganic mineral reinforcing materials, 50-100 parts of coal ash microspheres, 400-550 parts of quartz sand, 3-6 parts of thickening agents, 1-2 parts of a water reducing agent, 1-2 parts of a defoaming agent,4-8 parts of an early strength agent, 3-5 parts of fibers, 0-15 parts of rubber powder, 1-2 parts of a retarders, and 0-3 parts of pigment. The dividing strip is based on dry-mixed mortar which is high in early strength, rapid in setting, high in bonding strength and good in plasticity; therefore, efficient and rapid construction is achieved in cooperation with a specific construction method, thedividing strip can be shoveled or retained, and shoveled waste can serve as filler of common mortar or concrete to be reused after being collected and crushed.

The invention discloses a transverse self-heat-preservation energy-saving concrete block. A length direction of the concrete block is set to be parallel to the length direction of a wall formed by piled blocks, through holes penetrating the concrete block are arranged in the middle of the concrete block along the length direction, heat preservation holes used for filling heat preservation materials are arranged at two sides of the through holes along the length direction of the concrete block, and the top surface and the bottom surface of the concrete block are provided with a plurality of parallel grout grooves that are arranged along the length direction of the block.

The invention provides anti-cracking green environment-friendly spray coating paint and a preparation method thereof. The anti-cracking green environment-friendly spray coating paint is prepared fromthe following ingredients in parts by weight: 10 to 12 parts of water soluble acrylic resin, 5 to 8 parts of titanium dioxide, 3 to 6 parts of linseed oil, 2 to 5 parts of natural resin, 2 to 4 partsof cobalt iso-octoate, 8 to 12 parts of tung oil, 5 to 10 parts of calcium oxide, 3 to 6 parts of turpentine, 4 to 8 parts of stabilizing agents, 6 to 8 parts of glycerol, 2 to 4 parts of curing agents, 5 to 8 parts of epoxy resin curing glue and optional auxiliary materials. The linseed oil, the natural resin, the tung oil and the turpentine are added in the paint, so that the problems of cracking, layering and the like cannot occur with the use time increases; in addition, the paint obtained by using the formula is safe, environmental friendly, non-toxic and harmless; in addition, the concentration is low; a spray coating manner can be used; the uniformity is high; the furniture spray coating is facilitated; the application range is wide.

The invention relates to an ultrahigh-strength gas shielded welding wire and wire rod. The welding wire comprises the following chemical components, in percentage by mass, of 0.05%-0.15% of C, 0.65%-0.80% of Si, 1.7%-2.0% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 0.18%-0.28% of Cr, 1.4%-1.8% of Ni, 0.2%-0.6% of Mo, 0.10%-0.20% of Ti, 0.01%-0.05% of V, 0.007%-0.014% of N, and the balance Fe and inevitable impurities, and meanwhile, it is desirable to satisfy that Si/24+Mn/6+Ni/40+Cr/5+Mo/4=0.45%-0.55%, and Ti+6V+15N=0.3%-0.6%. According to the welding wire andthe wire rod, the yield strength of the weld metal of the welding wire is larger than or equal to 800 MPa, the tensile strength is larger than or equal to 900 MPa, the elongation A is larger than or equal to 18%, the impact energy Akv of -40 DEG C is larger than or equal to 50 J, and the welding performance and the crack resistance of the welding wire and the strong plasticity and toughness of theweld metal are both considered.

The invention discloses an anti-sintering long-life double-layer columnar structure thermal barrier coating and a preparation method thereof. The anti-sintering long-life double-layer columnar structure thermal barrier coating comprises a toughening layer located inside and a heat insulation layer located outside, the heat insulation layer comprises a longitudinal gap in the heat flow direction, and the heat insulation layer is composed of composite stacking of compact sheet-layer units and loose nano particle piles; the toughening layer accounts for 10%-50% of the total thickness of the double-layer structure thermal barrier coating, wherein the fracture toughness of a first thermal barrier coating material is greater than or equal to 2.5MPa.m<1/2>; and the heat insulation layer accountsfor 50%-90% of the total thickness of the double layers, and the thermal conductivity of a second thermal barrier coating material and a third thermal barrier coating material at the temperature of 1000-1600 DEG C does not exceed 2.5W/m.K. According to the double-layer columnar structure thermal barrier coating provided by the invention, the purpose of resisting sintering of the ceramic coating ina high-temperature environment can be achieved, and the cracking resistance of the coating is enhanced through the design of the toughening layer and the columnar structure, so that the anti-sintering and long-life collaborative design of the novel structure thermal barrier coating is realized.

The present invention discloses a thermal insulation mortar with a lower thermal conductivity coefficient and belongs to the technical field of building materials. The thermal insulation mortar is prepared from the following raw materials: 250-350 parts of silicate cement, 180-240 parts of river sand, 160-240 parts of construction waste residues, 120-170 parts of talc, 10-20 parts of asphalt, 30-80 parts of thermal insulation aggregate, 6-9 parts of mineral wool, 8-12 parts of lignocellulose, 3-8 parts of a water resistant agent and 3-5 parts of an admixture. The thermal insulation aggregate is composed of expanded perlite and hollow glass micro-beads in a weight ratio of 1:(0.1-0.3). The hollow glass micro-beads are compounded with the expanded perlite and mineral wool. The prepared thermal insulation mortar has a thermal conductivity coefficient obviously lower than that of thermal insulation mortar compounded by the expanded perlite and mineral wool, and also has higher strength andhigher use value.

The invention discloses a high-strength high-toughness low-alloy steel wire which comprises the following components in percentage by mass: 0.03-0.09% of C, 0.1-0.5% of Si, 0.9-1.5% of Mn, 0.5-0.9% of Mo, 2.2-2.8% of Ni, 0.3-0.7% of Cr, less than or equal to 0.01% of P, less than or equal to 0.01% of S and the balance of Fe and inevitable impurities. The invention also discloses a preparation method of the wire, which comprises the following steps: a, carrying out vacuum melting on the raw materials with a designed ratio to obtain a cast ingot; B, forging the cast ingot to obtain a bar; C, rolling the bar to obtain a wire rod; and d, annealing the wire rod, and then drawing the wire to obtain the wire . The high-strength high-toughness low-alloy steel wire can adapt to an inert gas environment in laser additive manufacturing, does not need special deoxidation and deslagging, can continuously work, does not need copper plating, and is environment-friendly.