146results about How to "Good anti-cracking effect" patented technology

The invention relates to an aluminum alloy welding wire and a preparation method thereof. The aluminum alloy welding wire is characterized by comprising the following chemical components in percentage by weight: 4-6 percent of Mg, 0.1-0.3 percent of Cr, not more than 0.1 percent of Fe and Si, 0.05-0.08 percent of Cu, 0.04-0.07 percent of Zn, 0.12-0.16 percent of Mn and the balance of Al. The preparation method of the aluminum alloy welding wire comprises the steps of: melting and refining, casting, homogenizing, thermally extruding, annealing, drawing, skiving and brightening, packaging and storing. The aluminum alloy welding wire provided by the invention is few in impurities, stable in performance, and small in texture grains, and has the characteristics of fatigue resistance, crack resistance, welding property and the like.

The invention discloses low-cost HB400-grade wear-resisting steel and a production method thereof. The low-cost HB400-grade wear-resisting steel comprises the following chemical components in percentage by weight: 0.08-0.19 percent of C, 0.20-0.50 percent of Si, 1.30-1.60 percent of Mn, smaller than or equal to 0.015 percent of P, smaller than or equal to 0.015 percent of S, 0.30-0.65 percent of Cr, 0.02-0.05 percent of Nb, 0.005-0.025 percent of Ti, 0.001-0.005 percent of B, 0.010-0.040 percent of Als and the balance of Fe and a trace amount of impurity elements. According to a steel plate, the thickness specification range is 10mm to 50mm; Rm is larger than or equal to 1300MPa; the percentage elongation is larger than or equal to 15%; the Akv is larger than or equal to 47J at -20 DEG C; the HBW / 10 / 3000 is larger than or equal to 400. The low-cost HB400-grade wear-resisting steel has the advantages that the manufacturing cost is greatly lowered, the problems of high strength and poor plasticity of wear-resisting martensite steel are solved, and the steel plate can be delivered directly. Therefore, the low-cost HB400-grade wear-resisting steel has quite high market competitiveness, wide application prospect and obvious economic benefits and social benefits.

The invention discloses a welding rod for welding of martensite heat-resistant steel and belongs to the technical field of welding materials. The welding rod consists of a core wire and a coating, wherein the core wire is prepared from components in percentage by weight as follows: 0.07%-0.10% of C, less than or equal to 0.3% of Si, 0.3%-0.7% of Mn, less than or equal to 0.004% of P, less than or equal to 0.002% of S, 8.5%-9.5% of Cr, 2.8%-3.3% of W, 2.8%-3.5% of Co, 0.04%-0.08% of Nb, 0.15%-0.25% of V, 0.8%-1.0% of Cu, 0.007%-0.011% of N, 0.011%-0.020% of B and the balance of Fe; the coating is prepared from components as follows: 30%-45% of marble, 18%-25% of fluorite, 5%-10% of rutile, 10%-16% of barium carbonate, 5%-10% of ferrotitanium, 1.5%-3% of electrolytic manganese, 5%-10% of iron powder, 0.4%-0.8% of sodium carbonate, 0.4%-0.8% of carboxymethyl cellulose and 0.8%-3% of chromium metal powder. The welding rod has the advantages that the arc is stable during welding, few splashes are caused, the all-position operability is good, the slag detachability is good, formed welds are attractive in appearance, and deposited metal after welding has high strength and high toughness close to that of a parent metal, higher endurance strength and excellent crack sensitivity.

The invention relates to a method for producing anti-crack bamboo sheet. It is characterized in following steps that: poaching the bamboo plane bar at the temperature as 50-95Deg. C and the density of hydrogen dioxide solution as 1.5-6.5%; drying the poached plane bar at the temperature as 45-65Deg. C and air relative humidity as 25-65%, to the water content as 5-9%; making the dried plane bar into fine plane bar to be coated with pastern; plane or side assembling the plane bars, to be compressed and shaped at the temperature as 88+-2Deg. C; the pressure of main compress unit is 0.2-0.6MPa, and the pressure of side compress unit is 5-7MPa; maintaining it for 3-7 days at the temperature as 20-30Deg. C and the air relative humidity as 20-50%. The invention has better anti-crack effect, which can be used in bamboo floor, etc.

The invention relates to a method for smearing wood wax oil on the surface of a wood product, which comprises the following steps: 1, smoothening; 2, smearing the wood wax oil; 3, kneading a wax oil coating on the surface; 4, wiping floating oil; 5, drying; 6, repeating the steps 2-5 for one or two times; 7, polishing till the hand feeling is smooth; and 8, spraying polishing wax, polishing and entering a next assembly process. By using the method, the crack of the wood product can be effectively prevented, and the service life is prolonged; the operation is simple, and materials, labors and oil are saved; the wood wax oil is a green and environmentally-friendly coating and a low-carbon environmentally-friendly product; and by using the method, the wide application of the wood wax oil can be promoted, and an important significance on environment friendliness is realized.

The invention relates to the field of cast iron rolls, in particular to a centrifugal composite high-nickel-niobium wear-resisting cast iron roll and a casting method thereof. The centrifugal composite high-nickel-niobium wear-resisting cast iron roll comprises a working layer and a core layer, and is characterized in that the working layer is composed of the following chemical components by weight percentage: 2.9-3.6% of C, 0.6-1.5% of Si, 0.4-1.2% of Mn, less than 0.10% of P, less than 0.05% of S, 3.01-4.8% of Ni, 1.0-2.0% of Cr, 0.2-2.0 % of Mo, 0.1-2.0% of Nb, 1.0-4.0% of V, 0.05-2.0% of W, and the balance of Fe. Compared with the prior art, the invention has the benefits that bulk wear-resisting particles are distributed in a dispersing way and embedded in a roll metal matrix in dot and bulk shapes, and graphite exists in a dot shape; the wear-resisting particles are distributed in a dispersing way and are firm and not easy to fall off by being embedded into the matrix, so that the whole wear-resisting performance of the matrix structure of the roll is greatly prompted; and wear of the whole roll surface of the roll is uniform.

The invention discloses a temperature-control anti-cracking method used for a concrete arch dam with a good anti-cracking effect. The temperature-control anti-cracking method used for the concrete arch dam comprises synchronous-cooling area temperature control and synchronous-cooling area height range control which are synchronously carried out. A finite element method is adopted to carry out numerical calculation and optimized analysis on five factors of a water pipe cooling process, construction progress, cantilever height, seasonal temperature change and a constraint condition, so that temperature real-time control adaptive to the synchronous-cooling area height is realized, and the anti-cracking effect of the concrete arch damis relatively good.

The invention provides a pollution-free non-adhesive bamboo and / or wood reconstructed material which comprises a plurality of unit bodies with set lengths. The unit bodies are connected into a whole through connecting structures to form the reconstructed material. The reconstructed material can be expanded in the horizontal direction and the longitudinal direction through the connecting structures. The invention provides a manufacturing method which comprises the steps of manufacturing of the unit bodies, molding and assembling, manufacturing of the molded material, manufacturing of the reconstructed material and the like, and the finished pollution-free non-adhesive reconstructed material is obtained after material maintenance and surface green treatment. The reconstructed material has no pollution or adhesives and is friendly to environment; internal stress of the material can be adjusted, so that the cracking phenomenon is avoided; the reconstructed material can be applied to the fields of building beam columns, structural members, furniture and decoration materials. By means of the manufacturing method, the reconstructed material without pollution and adhesives can be manufactured, and chemical pollution in the processing process of the reconstructed material is eliminated.

The invention discloses a building thermal insulation coating material and a preparation method thereof, and relates to the technical field of coating materials, wherein the raw materials comprise, byweight, 30-50 parts of an elastic emulsion, 2-5 parts of a film-forming aid, 1-3 parts of a dispersing agent, 1-3 parts of a wetting agent, 1-5 parts of a multifunctional aid, 30-50 parts of deionized water, 1-10 parts of glass hollow micro-beads, 1-15 parts of SiO2 aerogel, 1-30 parts of titanium dioxide and 1-3 parts of a thickening agent. According to the invention, the raw materials interactwith each other; the coating has excellent elasticity, excellent elongation and good anti-crack effect, can cover the existing tiny cracks and prevent the cracks caused by the cracking of the wall body, further is excellent in stain resistance, weather resistance, water resistance, alkali resistance and other performances, has low thermal conductivity, can achieve good heat insulation effect through thin-layer construction, and can effectively reduce the surface temperature of a building by more than 20 DEG C, and reduce the indoor temperature by about 7-10 DEG C; and the coating material reaches the performance indexes of the superior products of the national standard GB / T 9755-2001 of synthetic resin emulsion coatings for exterior wall, and has good application prospects.

The invention discloses a high-entropy alloy composite coating layer for surface protection for an aluminum die-casting die. The essential of the technical scheme is as follows: the high-entropy alloycomposite coating layer for surface protection for the aluminum die-casting die comprises a Ti priming layer, a CrAlN barrier layer, a CrAlNbN-CrAlSiN support layer with a gradient structure, and a CrAlNbSiON function layer which are sequentially deposited on the surface of the aluminum alloy die-casting die, wherein the CrAlNbN-CrAlSiN support layer with the gradient structure is a multi-periodcoating layer forming a cycle period from a CrAlNb layer to a CrAlSi layer; and the content of Nb element in the CrAlNbN-CrAlSiN support layer with the gradient structure is gradually increased from the CrAlN barrier layer to the CrAlNbSiON function layer, and the content of Si element is gradually reduced. The high-entropy alloy composite coating layer is compact in structure, good in interface bonding, not liable to crack and peel off, and good in anti-crack effect; and on top of increasing the hardness of the coating layer, Nb is beneficial to compaction for the coating layer, and further improves the toughness, the high-temperature corrosion resistance, the oxidation resistance and other performance of the coating layer.

The invention provides an environment-friendly fireproof material for electrical equipment and a preparation method of the environment-friendly fireproof material, and belongs to the fields of fireproof materials and preparation technologies thereof. The environment-friendly fireproof material for the electrical equipment is characterized by being prepared from the following raw materials in parts by weight: 50 to 60 parts of modified epoxy resin, 30 to 40 parts of fluorocarbon resin, 60 to 90 parts of a fire retardant, 3 to 10 parts of expanded graphite, 3 to 10 parts of alumina silicate fiber and 2 to 8 parts of molecular sieves. The fireproof material provided by the invention is applied to fire protection of the electrical equipment, and is high in crack resistance, water resistance and weather resistance and good in expansion character; meanwhile, the heat release rate of a base material in a burning condition can be obviously reduced, and the quality loss is reduced; moreover, the fireproof material is small in smoke production quantity and good in environmental protection effect.

The invention discloses a Chinese jujube fruit crack proofing cover. The crack proofing cover comprises a rack which can cover a crown of a Chinese jujube tree, a transparent layer which is arranged outside the rack and has an airtight top, a plurality of lines of vent holes which are distributed around the transparent layer, sheltering layers which are arranged outside the transparent layer and above each line of the vent holes. One end of the sheltering layer is fixed with the transparent layer above the vent holes and the other end is hung in the air so that air in the transparent layer can be discharged; and bottom of the transparent is provided with a pulling line. The Chinese jujube fruit crack proofing cover has functions of rain sheltering and ventilating. Experiment proves that the Chinese jujube fruit crack proofing cover can be used in rainy days for preventing raindrops from directly wetting the jujubes and preventing cracking of red jujubes, thus playing a role of reducing fruit cracking loss. The Chinese jujube fruit crack proofing cover has the advantages of simple manufacture, convenient use and low cost, and can obviously relieve the original status that fruit cracking occurs after 3 rainy days, yield decreases by a half after 10 rainy days and no fruit is harvested after 15 rainy days.

The invention relates to a bamboo handrail, which is formed by a plurality of bamboo tubes in a connecting way and is characterized in that the bamboo tubes are installed on a rail after material selection, anticorrosive treatment, shape fixation, surface decoration, coloring, paint dipping, installation and finish painting; and saddles, trays or fixing blocks are arranged between the bamboo tubes and the rail, and the bamboo tubes and the rail are connected through wooden screws or ties. The bamboo handrail has the advantages of low cost, good hand feeling, natural attractiveness, environmental friendliness, simplicity in production, long service life and the like.

The invention discloses a high-manganese high-chromium self-shielded welding wire and a production technique thereof. The high-manganese high-chromium self-shielded welding wire comprises a steel strip and an alloy powder core, wherein the steel strip is wrapped on the alloy powder core. The alloy powder core comprises the following components in percentage by mass: 0-0.2% of C, 6-20% of Cr, 10-20% of Mn, 0-5% of Ni, 0-2% of Si, 0-3% of Mo and 0-3% of V. The high-chromium high-manganese self-shielded welding wire disclosed by the invention has the advantages of high welding efficiency and favorable cracking resistance, can be used for overlay welding of different alloy mother metals, and can be used as a precoating or transitional material for welding dissimilar steel. Meanwhile, the alloy has favorable working hardenability, can be designed as a surface strengthening material, and has shock resistance and wear resistance.

The invention discloses exterior wall external thermal insulation bonding mortar which is composed of the raw materials of, by weight, 20-30 parts of sulphoaluminate cement, 40-60 parts of quartz sand, 15-25 parts of yellow loam, 12-16 parts of soapstone powder, 2-3 parts of organosilicone powder, 3-5 parts of calcium phosphate, 16-22 parts of granular glass wool, 8-12 parts of rice bran powder, 2-3 parts of magnesium chloride, 0.5-1 part of hydroxyethyl cellulose, 1.5-2.5 parts of urea-formaldehyde resin gum powder, 0.5-1 part of sodium carboxymethyl starch, 1-2 parts of guar gum powder, and 3-6 parts of a composite filling material. The exterior wall external thermal insulation bonding mortar provided by the invention has the characteristics of high bonding strength, good thermal insulation performance, good cracking resistance, low water absorption rate, good water resistance, good weatherability, and the like. With the mortar, an obtained building exterior wall thermal insulation system can resist cracking, hollowing and chalking. The building exterior wall thermal insulation system also has the advantages of high adhesion strength with a wall body, good construction performance, good waterproofing effect, good mildew-resisting effect, and the like. With the exterior wall external thermal insulation bonding mortar, building exterior wall external thermal insulation requirements can be satisfied.

The invention discloses a welding wire for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel. The welding wire is characterized by comprising, by mass, 0.07-0.20% of C, 0-0.3% of Si,0.5-1.6% of Mn, 0-0.010% of P, 0-0.010% of S, 2.00-2.60% of Cr, 0.90-1.15% of Mo, 0.30-0.41% of V, 0.01-0.04% of Nb, 0-0.15% of Cu, 0-0.10% of Ni, 0-0.005% of Sb, 0-0.006% of Sn, 0-0.008% of As, 0-0.02% of Ti, 0-0.01% of B, 0-0.007% of O, 0-0.010% of N and the balance Fe. A welding flux comprises, by mass, 21-37% of magnesium oxide, 3-10% of silicon dioxide, 7-21% of calcium oxide, 10-21% of aluminum oxide, 5.7-22.7% of carbonate, 6.5-21% of fluorite, 0-3% of potassium feldspar, 0-2% of electrolytic manganese, 0-1% of ferrosilicon and 0-2.5% of aluminum powder. The welding wire and the welding flux have the advantages that the welding wire is used with the welding flux, and accordingly larger weld width can be obtained in a welding process under an alternating-current submerged-arc welding process; when thick walls are welded, effective sidewall bonding is facilitated, weld metal after welding is high in low-temperature impact toughness and highly resistant to cracks.

The invention discloses a water-based waterproof coating added with calcium sulfate whiskers and a preparation method of the coating. The water-based waterproof coating is prepared from the following raw materials in parts by weight: 10-35 parts of calcium sulfate whiskers, 5-10 parts of vinyl perchloride resin, 14-20 parts of epoxy resin, 3-10 parts of dibutyl phthalate, 1-9 parts of a thickener, 3-6 parts of pigments, 1-5 parts of additives and 30-40 parts of water. The preparation method comprises the following steps: weighing; modifying; and mixing. The water-based waterproof coating added with calcium sulfate whiskers disclosed by the invention has excellent fireproof effect and anti-cracking property, low in cost of raw materials and non-toxic and environment-friendly. The method for preparing the coating is simple to operate, convenient to produce, low in requirement on equipment and suitable for industrial large-scaled production.

The invention discloses a processing method of environment-friendly boards, solves the technical problems that the existing boards are easily deformed, the anti-cracking effect is poor and the anti-cracking manner is unsafe and not environmentally friendly, and belongs to the technical field of processing of the boards. The method comprises the following steps: treating raw wood, drying boards, carrying out anti-cracking pretreatment, hot pressing, washing, drying and shaping, and carrying out anti-cracking treatment. According to the processing method of the environment-friendly boards, the natural raw materials adopted in the whole production process are green and environmentally friendly and are free of heavy metals and materials such as toluene and azo harmful to the human body; othertoxic by-products and harmful materials such as formaldehyde are also not generated in the production process, so that the production process is suitable for large-scale batch production. The boards prepared by the processing method of the environment-friendly boards are excellent in anti-cracking effect, low in cracking rate and excellent in durability, and are greener and more environmentally friendly.

The invention discloses a method for preventing tomato fruits from cracking. When the tomato fruits are in a veraison stage with a basically fixed size, the branching positions between the fruiting branches and main spike stalks are fixed, and the parts 2-3cm away from the branching positions on the main spike stalks are rotated 180-270 degrees clockwise or anticlockwise. In sunny days, the method can be adopted to twist the main spike stalks of the tomatoes to partially damage the phloem so as to reduce transportation of photosynthates, lower growth speed of flesh, and enable the growth speeds of peel and flesh to be consistent, thereby playing a role in fruit cracking prevention. Tests show that the fruit cracking rate can be reduced by more than 15%.

The invention relates to the technical field of refractory heat-insulation materials, in particular to a compressive anti-cracking light heat-insulation brick. The compressive anti-cracking light heat-insulation brick comprises ceramic waste mud, fly ash, clay powder, calcined kaolin, floating beads, reinforced fibers, foaming agents, magnesium fluoride, alpha-aluminum oxide and water. The compressive anti-cracking light heat-insulation brick has the advantages that the reinforced fibers are ceramic fiber materials prepared by the aid of electrostatic spinning and high-temperature calcinationtechnologies, the ceramic fiber materials are good in refractoriness and strength, roughening treatment is carried out on the surfaces of the ceramic fibers, silicon carbide whiskers are solidified onthe surfaces of the ceramic fibers, accordingly, good bonding effects can be realized between the ceramic fiber materials and main aggregate of the compressive anti-cracking light heat-insulation brick, and the compressive strength and the anti-cracking ability of the compressive anti-cracking light heat-insulation brick can be obviously enhanced.

The invention relates to the technical field of highway pavement laying, in particular to a cement-stabilized macadam base. The cement-stabilized macadam base is prepared from the following compositions in parts by weight: 78-87 parts of coarse aggregates, 5-13 parts of fine aggregates, 4-9 parts of high belite cement, 0.2-0.8 part of a calcium sulphoaluminate-calcium oxide compound expansion agent and 5-15 parts of water, a waterproof reinforcing agent is sprayed on the surface layer of the cement-stabilized macadam base, and the waterproof reinforcing agent is prepared from the following rawmaterials in percentage by weight: 1-3% of a fatty acid water-proofing agent, 50-70% of a styrene-acrylic emulsion, 15-30% of asbestos powder and 10-25% of water; and the invention further relates toa construction method of the cement-stabilized macadam base. According to the base obtained through construction, compared with the prior art, the mechanical strength is improved, the average temperature shrinkage coefficient and the average dry shrinkage coefficient are both decreased, and the comprehensive performance is improved.

The invention discloses a steam heat treatment type drying method for whole bamboos. The method comprises the following steps: stewing bamboo sections with bamboo joints or bamboo walls which have been perforated in a mixed solution of sodium chloride and acetic acid at a temperature of 100 DEG C under normal pressure; then trimly placing the whole bamboo sections in a steam tank and carrying out treatment at a temperature of 110 to 140 DEG C under a vapor pressure of 0.14 to 0.25 MPa; and finally, carrying out low temperature drying on the bamboo sections in a steam dry kiln which has a steam injection function and carrying out humidity elimination on the dry kiln until the water content in the bamboo sections reaches 10 to 18%. With above-mentioned treatment, the whole bamboos have better drying and anti-cracking effects, improved stability and weatherability, enhanced strength and a prolonged service life.

The invention discloses a welding wire for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel. The welding wire is characterized by comprising, by mass, 0.07-0.20% of C, 0-0.3% of Si,0.4-1.6% of Mn, 0-0.010% of P, 0-0.010% of S, 2.00-2.60% of Cr, 0.85-1.16% of Mo, 0-0.1% of Cu, 0.03-0.25% of Ni, 0-0.30% of Al, 0-0.005% of Sb, 0-0.006% of Sn, 0-0.008% of As, 0-0.010% of O, 0-0.030% of N and the balance Fe. A welding flux comprises, by mass, 18-35% of magnesium oxide, 5-18% of silicon dioxide, 5-21% of calcium oxide, 11-21% of aluminum oxide, 5.7-20% of carbonate, 4.3-17.3% offluorite, 0.5-5% of potassium feldspar, 0-2% of electrolytic manganese, 0-1% of ferrosilicon and 0-2.5% of aluminum powder. The welding wire and the welding flux have the advantages that the welding wire is used with the welding flux, and accordingly the welding performance is good, and welded joints are highly resistant to crack and excellent in mechanical performance; the welding wire and the welding flux are applicable to containers such as a hydrogenation reactor with the wall thickness of 2.25Cr-1Mo, so that the welded joints are excellent in performance without defects.

The invention relates to a combined type unreinforced thermal-insulating sandwich external wall slab and a manufacturing method for an inner laminate and an outer laminate of the same in order to solve the problems of poor fireproof safety for the thermal insulating construction of an external wall, cracking resistance of a wall slab material, complex construction caused by the employment of a reinforced keel as well as large thickness of a surface layer and high self-weight of a wall slab caused by conventional connecting pieces. In the first scheme, one extruded sheets or waterproof rock wool bars are respectively arranged at two ends of a rock wool layer, the head of each first FRP (Fiber Reinforced Plastic) connecting piece is arranged in a first lug boss, the other end of the same is arranged at the outer part the an inner laminate after penetrating through a corresponding preserved hole and a second lug boss, the head of each second FRP connecting piece is arranged in the first lug boss, and the other end of the same is arranged in the second lug boss after penetrating the corresponding preserved hole. In the second scheme, cement, pulverized fuel ash, silver sand, swelling agent and defoaming agent are uniformly mixed in a mixing machine in sequence; and materials are discharged and molds are cast after adding water reducing agent, water and steel fiber into the mixture. The combined type unreinforced thermal-insulating sandwich external wall slab is applied to building field.

The invention discloses a geopolymer gel material prepared by taking manganese slag and fly ash as raw materials, and a preparation method and application of the geopolymer gel material. Based on a solid component and an excitation component, the composition comprises 65-85 wt% of the solid component and 15-35 wt% of the excitation component, and the composition further comprises a waterproof agent. The solid component is composed of fly ash or a mixture of manganese slag and fly ash, wherein the weight ratio of the manganese slag to the fly ash in the mixture is 1:(0.5-15). The excitation component is composed of an excitant. In a preparation process, secondary waste residues, waste water and waste gas are not generated, and safe greening implementation is realized. The geopolymer gel material has the advantages of rapid setting and early strength, moderate strength, simple process, low production cost, safety and effectiveness, good durability, and the like. The material can be usedin construction, civil engineering and rapid repair materials, and industrial solid waste reclamation is realized.

The invention provides an anti-cracking concrete. The anti-cracking concrete is prepared from the following raw materials in parts by weight: 7-12 parts of industrial aluminum sulfate, 5-9 parts of high-strength steel-wire-like fibers, 60-80 parts of dinas, 3-8 parts of siderite, 90-150 parts of cement, 5-9 parts of diatom ooze, 7-10 parts of calcium carbonate, 8-15 parts of blast furnace slag, 3-6 parts of sodium carbonate, 0.5-2 parts of sodium hexametaphosphate, 2-4 parts of aluminum hydroxide, 2-6 parts of coal ash, 6-10 parts of dicalcium silicate and 9-14 parts of lithium slag. The anti-cracking concrete has the beneficial effects of excellent anti-cracking capability, and meanwhile, low water consumption and reduction of resource waste; and besides, the anti-cracking concrete is good in fluidity and low in deformation.

The invention discloses a high-cracking-resistance concrete curing agent. The concrete curing agent is made of, by weight, 20 parts to 45 parts of sodium silicate, 15 parts to 35 parts of heavy calcium carbonate, 10 parts to 25 parts of aluminum silicate and 25 parts to 55 parts of polypropylene fibers. By means of the concrete curing agent, the polypropylene fibers are added in the concrete curing agent, and accordingly, microcracks caused by factors of concrete solid plastic shrinkage, air shrinkage, temperature variation and the like can be controlled effectively, forming and developing of cracks can be prevented and restrained, the crack-resistant anti-penetrability performance and the shock resistance and aseismic capacity are improved greatly, cracks of concrete can be reduced effectively, and the concrete curing agent is particularly applicable to construction projects of houses, roads, bridges and the like.

The invention provides quick-drying and anti-cracking oil paint and a preparation method thereof. The oil paint is prepared from the following raw materials in parts by weight: 20 to 30 parts of acrylic emulsion, 10 to 15 parts of polyurethane resin emulsion, 5 to 10 parts of vinyl versatate, 15 to 20 parts of zeolite powder, 10 to 15 parts of pigment toner, 3 to 6 parts of dipropylene glycol butyl ether, 3 to 6 parts of butyl acetate, 0.5 to 1 part of a polyethylene-ethylene glycol-methacrylic acid copolymer, 0.2 to 1 part of bee wax, 0.2 to 1 part of a drier, 0.2 to 1 part of sodium benzoate and 10 to 20 parts of distilled water. According to the quick-drying and anti-cracking oil paint, all the components have a common effect and an air drying speed of the oil paint is effectively improved; meanwhile, the color and luster, hardness and stability of the paint can be improved and the drawing efficiency is improved; the quick-drying and anti-cracking oil paint has very good popularization and application value.

The invention discloses a digitalized construction site concrete prediction type anti-cracking method which comprises the following steps: firstly, arranging a temperature and stress sensor at a concrete sensitive position, then endowing concrete with a thermal parameter initial value, and then feeding back and analyzing a concrete thermodynamic parameter based on a particle swarm algorithm; calculating internal temperature predicted value and a stress predicted value in future 4-7 days according to a control equation of a three-dimensional unstable temperature field and a control equation ofa creep stress field; and finally, taking anti-cracking measures on the mass concrete according to the solved stress prediction value. According to the method provided by the invention, the calculation result is more accurate, and the concrete anti-cracking measure is adjusted according to the predicted future concrete temperature and stress development trend, so that the anti-cracking effect is the best.

The invention relates to HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and a producing method thereof. The steel comprises, by mass percent, 0.15%-0.24% of C, 0.20%-0.50% of Si, 1.30%-1.60% of Mn, not larger than 0.015% of P, not larger than 0.015% of S, 0.30%-0.65% of Cr, 0.40%-0.80% of Mo, 0.03%-0.06% of Nb, 0.015%-0.035% of Ti, 0.001%-0.005% of B, 0.010%-0.040% of Als, not larger than 0.0035% of N and the balance Fe and trace impure elements. According to the HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and the producing method thereof, the alloy addition amount is small, the alloy cost is low, and the HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel belongs to resource-saving steel; a short process manufacturing process is adopted in the producing method, energy loss caused by a complex heat treatment process is avoided, the production period is greatly shortened, andthe procedure cost is reduced; the problem that due to the fac that the strength and plasticity of martensitic wear-resistant steel are not matched, cracks are likely to be generated is solved, and the use safety and high efficiency of the wear-resistant steel are improved; and high market competitiveness and wide application prospects are achieved, and the economic benefits and the social benefits are obvious.