72results about How to "High flexural strength" patented technology

The invention is applicable to the technical field of building materials, and provides a concrete and a preparation method of the concrete. The concrete comprises a cementing material, river sands, a super plasticizer, water, steel fibers and polypropylene fibers. The concrete of the invention has a gradation synergetic effect by utilizing mixed graded steel fibers, so as to greatly improve compressive strength and bending strength, crack resistance and impact resistance of concrete; and the concrete overcomes early-stage microcrack problem of concrete via fine polypropylene fibers, and mainly improves toughness of concrete via coarse polypropylene fibers, so as to realize the advantages of concrete such as high compressive strength and bending strength, high crack resistance, and good durability. The concrete preparation method is easy in operation and low in cost, and is very suitable for industrial production.

The invention discloses a novel styrene-butadiene latex modified cement based grouting reinforcement material used for reinforcing coal rock and a preparation method thereof. The high-performance styrene-butadiene latex cement based grouting material is prepared from common silicate cement, styrene-butadiene latex, water reducing agent, defoaming agent, coagulation regulating agent and the like in a certain mass ratio. The grouting material has higher water-cement ratio, strong water-retaining property, good liquidity and grouting property, good volume stability and controllable slurry coagulation time, and can keep long-term conveying without bleeding; and the construction is simple and the operation is convenient. The material has good bonding power with the coal rock and proper strength when reinforcing the coal rock, the slurry is innocuous, and the material has low price and can be widely applied to the reinforcement of various crushed coal rocks.

The invention relates to a type of cement and a preparation method thereof, and particularly relates to a composite cement and a preparation method thereof, belonging to the technical field of building materials. The composite cement obtained by grinding 46-70 parts of portland cement clinker, 4-8 parts of gypsum, 10-15 parts of activated sludge, 10-30 parts of fly ash, and 2-5 parts of limestone until the specific surface area is greater than 300 m<2> / Kg is high in early strength, thus solving the key technical problems that the early strength of the composite cement is increased and water for treating sludge is effectively utilized. The compressive strengths of the composite cement achieve 17-25 MPa and 45-60 MPa, and the flexural strengths of the composite cement achieve 3.5-5 MPa and 6-8 MPa in 3 days and 28 days respectively; and the composite cement is provided with a micro-expansion characteristic, is capable of giving compensating shrinkage performance to mortar and concrete, and improving the anti-crack capacity of mortar and concrete, and is suitable for production for mortar, concrete and products.

The invention discloses a cement-based wave-absorbing material doped by graphene oxide and a preparation method thereof. The preparation method comprises the following steps: weighing cement for subsequent usage; weighing silica fume according to a certain mass ratio, pouring the cement and silica fume into a stirring pot, carrying out uniform mixing under stirring, then weighing nanometer ferriferrous oxide and nanometer nickel according to a certain mass ratio, pouring the weighed nanometer ferriferrous oxide and nanometer nickel into the stirring pot and carrying out low-speed stirring for 2 to 5 min; adding dispersion liquid of graphene oxide into a mixture obtained in the previous step and carrying out ultrasonic vibration; and finally, weighing water and a water reducer according to a mass ratio, adding the weighed water and water reducer into the mixture, carrying out low-speed stirring with an agitator for 2 to 5 min, stopping stirring for 10 to 30 s, then carrying out high-speed stirring for 2 to 5 min, injecting obtained slurry into a mold, carrying out vibration molding, then carrying out maintenance in a constant-temperature constant-humidity case, carrying out demolding in 24 h and then continuing maintenance under same conditions so as to obtain the cement-based wave-absorbing material. The cement-based wave-absorbing material doped by graphene oxide has the advantages of good wave absorption performance, wide frequency range, environment friendliness and no radioactivity; the preparation method is simple in process, easy in shaping and suitable for standard production; and the prepared material can be well bonded with buildings.

The invention discloses an environment-friendly wall fireproof heat-preserving board and a preparation method thereof. The environment-friendly wall fireproof heat-preserving board is prepared from the following raw materials in parts by weight: 26-60 parts of straw powder, 0.2-3 parts of guanylurea phosphate, 0.1-1.2 parts of boric acid, 15-45 parts of magnesium oxide, 5-15 parts of magnesium chloride or magnesium sulfate, 1-30 parts of coal ash or diatomite in powder, 0-30 parts of crushed crude pearlite or leech powder, 0.1-0.5 part of a styrene-acrylic emulsion, 0.1-0.5 part of calcium lignosulphonate and 5-25 parts of tap water. The preparation method comprises the following steps: first, mixing straw powder, guanylurea phosphate, boric acid, magnesium oxide, coal ash or the diatomite in powder, crushed crude pearlite or leech powder and calcium lignosulphonate; then, adding magnesium chloride or magnesium sulfate, the styrene-acrylic emulsion and tap water; and after fully and uniformly stirring at normal temperature, putting in a template, rolling, maintaining and demoulding to prepare the wall fireproof heat-preserving board. The environment-friendly wall fireproof heat-preserving board has the characteristics of high compression and breaking strength, good moisture absorption, water adsorption, flame retardant and anti-freezing performances, small heat conductivity coefficient, no formaldehyde, environmental friendliness, fireproofness and heat preservation.

A microcrystalline bamboo-charcoal cellular pottery-texture air filter panel with catalytic function is prepared by using a catalytic material to coat a microcrystalline bamboo-charcoal cellular pottery-texture air filter panel prepared from the following compositions in percent by weight: 20-40% of bamboo charcoal powder, 40-60% of porous nonmetal mineral powder, 10-30% of clay and 2-5% of a binder. The preparation method of the air filter panel comprises: adding the catalytic material into a silica gel water dispersion, stirring to form a suspension, and then putting the microcrystalline bamboo-charcoal cellular pottery-texture air filter panel into the suspension for dipping, taking out and drying. The photocatalytic function of the catalytic material and the adsorption function of the microcrystalline bamboo-charcoal cellular pottery-texture air filter panel are integrated, so that the photocatalytic effect of the catalytic material is improved, and the preparation method is simple and convenient to apply.

Provided are a carbon fibre thermoplastic resin prepreg which is a carbon fibre prepreg obtained by impregnating a PAN-based carbon fibre in which the average fibre fineness of a single fibre is 1.0 dtex to 2.4 dtex with a thermoplastic resin, wherein the thermoplastic resin satisfies 20≦(FM / FS)≦40 (where FM: flexural modulus (MPa) of a resin sheet comprising only the thermoplastic resin, and FS: flexural strength (MPa) of the resin sheet), a method for manufacturing the same, and a carbon fibre composite material employing the carbon fibre prepreg.

The invention relates to a high-tenacity dental ceramic bracket material and a preparation method thereof. The high-tenacity dental ceramic bracket material is characterized by taking aluminum oxide as a main component, nanometer zirconium oxide powder as a toughening agent, nanometer yttrium oxide as a phase stabilizing agent and fatty acid as a powder surface modifying agent, and comprises the nanometer zirconium oxide powder, nanometer yttrium oxide powder, the fatty acid, magnesium oxide and the aluminum oxide. The preparation method comprises the following steps of: uniformly mixing the nanometer zirconium oxide powder, the nanometer yttrium oxide powder and the fatty acid in a ball-milling mode; and adding the magnesium oxide and the aluminum oxide, and continuously performing ball-milling mixing until the mixture is uniform. The flexural strength of a dental ceramic bracket prepared by the method is obviously improved compared with that of other common dental ceramic brackets; and the flexural strength of a common dental ceramic bracket is not more than 700MPa commonly, but the flexural strength of the dental ceramic bracket prepared by the method can reach 900MPa.

The invention relates to a steel pipe reactive powder concrete column-flat beam-shear wall structure system, which comprises steel pipe concrete columns, reinforcing steel bar concrete beams and reinforcing steel bar concrete shear walls, wherein each steel pipe concrete column is a steel pipe reactive powder concrete column formed by pouring reactive powder concrete, and each reinforcing steel bar concrete beam is a flat beam, namely the width of each reinforcing steel bar concrete beam is larger than or equal to the height of the same. Since the compression strength of the reactive powder concrete (RPC) is 4-10 times of that of common concrete, the RPC and steel pipes are combined to form the steel pipe RPC columns, the section size of each column is greatly reduced, and the usable area of a building is increased. Additionally, the structure system has the advantages of a flat beam structure, such as capability of lowering story height, avoiding pipelines to penetrate through the beams and the like, thereby having extremely good comprehensive economic benefits and being suitable for large-scale popularization and application.

The present invention provides a case for installing semiconductor element for use in LED etc. formed from a white thermosetting silicone resin composition and a cured material thereof that have low light transmittance rate, excellent moldability and are difficult to cause a burr to occur in molding. Provided is a white thermosetting silicone resin composition for a light-emitting semiconductor device, comprising: (A) a resin organopolysiloxane having a hydroxy group, and exhibiting a weight-average molecular weight of 500 to 20,000 based on polystyrene conversion, (B) an organopolysiloxane having a straight-chain diorganopolysiloxane residue, (C) a white pigment, (D) an inorganic filler other than (C), (E) a silane coupling agent in which a refractive index difference from the resin organopolysiloxane (A) is higher than or equal to 0.02 and a boiling point at atmospheric pressure is higher than or equal to 200° C., and (F) a curing catalyst.

The invention discloses a plant fiber recycled concrete block and a preparation method thereof. The block is made from water, cement, sand, coarse aggregate and plant fiber, wherein the coarse aggregate adopts the mixture of natural macadam and recycled macadam; the ratio of the recycled macadam to the coarse aggregate is 30 to 50 percent; the ratio of plant fiber to the concrete block is 1 to 2 percent. Compared with the existing recycled concrete block, the plant fiber recycled concrete block has the advantages that the plant fiber recycled concrete block not only utilizes construction waste as the coarse aggregate of concrete, and meanwhile is mixed with waste crops to combined with the coarse aggregate, although the compressive strength of the axis of the block is reduced to a certain extent as compared with the existing recycled concrete block without recycled aggregate mixed, the tensile strength of the concrete is improved due to the influence of the plant fiber, the strength meets the requirements, and the plant fiber recycled concrete block can be applied to load-bearing blocks.

The invention relates to novel road steel slag cement formula development and application and provides novel road steel slag cement simple in preparation and excellent in performance and a preparation method and application thereof. The novel road steel slag cement is prepared from, by mass, 68-72 parts of cement clinker, 18-22 parts of steel slag, 4.6-5.4 parts of mineral slag, 4.1-4.8 parts of gypsum and 0.4-0.6 part of concrete activating agent. By proportional mixing the recycled steel slag with the cement clinker, the mineral slag and the like, freezing resistance, corrosion resistance and volume stability of the cement are improved, cement dry shrinkage changes are reduced, and hydration heat is reduced. The novel road steel slag cement in application of road construction has advantages of high strength, abrasion resistance, skid resistance, high durability, low maintenance cost, prolonging of service lives of expressways and the like. The novel road steel slag cement is applicable to the field of pavement materials.

The invention discloses an autoclaved lime-sand brick and a production method thereof. The autoclaved lime-sand brick is produced through a dehydrated mud cake drying step, a crushing and grinding step , a proportioning and stirring step, a digestion aging step, a compaction molding step and an autoclave curing step of raw materials containing exposed aggregate finish, sandstones, cement and building mud cakes. The obtained autoclaved lime-sand brick has good mechanical properties and meets the requirements of national standard GB50574-2010, and the method realizes the recycling of solid wasteconstruction mud cakes, reduces the production cost of the autoclaved lime-sand brick, reduces the occupied land of construction wastes, and has a good industrial prospects and a great social significance.

The invention discloses a self-leveling mortar and a preparation method thereof. The self-leveling mortar comprises the following raw materials in parts by weight: 3-11% of cement; 35%-45% of desulfurized gypsum; 20%-30% of a filler; 1-3% of silica fume; 1%-2% of an amorphous calcium aluminate cement rapid hardening agent; 0.5 to 1% of eucalyptol; 0.2%-0.6% of apiezon grease; 2-4% of calcium propionate; 1-2% of lithium carbonate; 2-4% of titanium dioxide; 1-2% of a thickening agent; 1-2% of a water reducing agent; 2-3% of polyether sulfone; 2-4% of a polyvinyl chloride thermoplastic elastomer;and 1-5% of an additive. The self-leveling mortar is high in breaking strength, high in compressive strength, high in fluidity and high in ground bonding force, and the overall comprehensive performance is greatly improved.

The invention discloses an activated carbon material with high crack resistance, and belongs to the field of chemical engineering. The activated carbon material has the advantages that the activated carbon material is made from coconut shells, organic components such as glucose and pentosan in the coconut shells can be sufficiently exposed in glycerin and hydrogenated castor oil ball-milling procedures, systems of the activated carbon material can be connected with one another by the organic components, rigid nanometer SiO2 and high-activity sodium humate, and accordingly the breaking strengthof the systems can be effectively improved; bacterial celluloses, octenyl succinic starch ester and the like are used as wall materials for the activated carbon material, oil is used as a core material for the activated carbon material, calcium bicarbonate solution is used as an inorganic flocculating agent, terephthalaldehyde is used as a cross-linking agent, the added nanometer SiO2 has extremely large specific surface areas, surface atoms are extremely high in unsaturation, accordingly, the impact energy dispersive capacity and absorptive capacity of the activated carbon material can be improved, the bending strength and the compressive strength can be improved, and the problems of poor bending strength and compressive strength of existing common activated carbon materials can be solved by the aid of the activated carbon material.

The invention belongs to the field of building materials, and relates to a method for improving the mechanical property of a gypsum-based material. The method comprises the following steps that: a) gypsum powder, a reinforcing agent, a toughening agent, a hardening agent and water are mixed to obtain gypsum slurry, wherein the reinforcing agent comprises an acrylic polymer, polyisocyanate polyester, polyalkyd resin and the like, wherein the toughening agent comprises glass fibers, paper fibers and wood fibers, and the hardening agent comprises sodium silicate, quartz powder and sand; and b) solidifying and molding the gypsum slurry, and then performing drying to obtain the high-strength gypsum-based material. According to the method provided by the invention, the reinforcing agent, the toughening agent and the hardening agent of specific types are doped into the gypsum, so that the breaking strength, hardness and shearing strength of the gypsum-based material are greatly improved. Withthe method adopted, the problem of poorer mechanical property of a traditional gypsum-based material can be solved; the mechanical strength and nail-holding power of the prepared gypsum-based material can be comparable with those of a blockboard, and the gypsum-based material has a higher fireproof grade than the blockboard.

The invention discloses a method for preparing a concrete floor tile with high strength. The method comprises the following steps that light calcium carbonate, building rubbish, fly ash, vermiculite power and polyamide resin are evenly mixed to obtain a premix a; cement, quick lime, blast furnace slag, hollow glass beads, kieselguhr, gravel, microcrystalline cellulose, wollastonite powder and aluminum borate whisker are evenly mixed to obtain a premix b; the premix a, the premix b and water are evenly mixed, vibration and extrusion molding, demoulding and maintenance are carried out to obtainthe concrete floor tile with the high strength. The provided method for preparing the concrete floor tile with the high strength has the advantages that the obtained concrete floor tile has small volume weight, excellent compressive strength and rupture strength, and good thermal insulation performance.

The invention discloses a calcination-free phosphogypsum brick and a manufacturing method thereof, and belongs to the field of building materials. The formula comprises phosphogypsum, aggregate, cement and an alkaline activator. The preparation method comprises the following steps: proportionally mixing the raw materials, stirring, crushing, carrying out extrusion molding, and curing to finally obtain the finished product calcination-free phosphogypsum brick. The calcination-free phosphogypsum brick prepared by the method is high in compression strength and breaking strength and good in waterresistance, freezing resistance and durability. According to the invention, the main raw materials are a large amount of solid wastes such as phosphogypsum, aggregate and the like, and the wastes areactivated and reasonably doped into the phosphogypsum brick, so that complicated pretreatment processes such as washing, drying, calcining and the like of phosphogypsum are avoided, and greenhouse gassuch as CO2, NO2, SO2 and the like, wastewater and secondary solid wastes are not discharged. According to the method, the utilization rate of phosphogypsum is greatly increased, accumulation of phosphogypsum is reduced, the land pollution rate is reduced, and great contribution is made to environmental protection.

The invention discloses a preparation method capable of improving mechanical properties of mortar. Materials used in the preparation method include lithium slag, fly ash or steel slag as a mineral admixture, ordinary Portland cement, standard sand, water and a polycarboxylate water reducing agent, wherein 450 parts of the ordinary Portland cement, 405-1350 parts of the standard sand, 405-1350 parts of the lithium slag or fly ash or steel slag, 225 parts of water and 0-5 parts of the polycarboxylic acid water reducing agent are used. The flexural strength and the compressive strength of the cement mortar prepared by the preparation method are increased by 128% and 83% at most respectively, and the density is reduced by 24% at most; when the mechanical properties of the mortar reach the maximums, the using amounts of the lithium slag, the fly ash and the steel slag in the scheme are 3 times, 4.5 times and 15 times of that of replaced cement. Therefore, the mortar prepared by the preparation method has the functions of reinforcement and light weight; meanwhile, a large amount of industrial waste is used, so that environmental pollution of the industrial waste is reduced, and relatively large social, economic and environmental benefits can be brought.

The invention relates to the technical field of refractory materials, in particular to a low-carbon magnesia carbon brick with oxidation resistance and a preparation method thereof. The low-carbon magnesia carbon brick comprises the following components in parts by weight: 88-96 parts of fused magnesite, 1-3 parts of metal aluminum powder, 3 parts of resin, 1-3 parts of a ZrB2-Cr7C3 multi-phase material, 1-3 parts of high-temperature asphalt and 1-3 parts of -196 graphite. Through the structural design of the low-carbon magnesia carbon brick with oxidation resistance, the technical problems that in the prior art, the excellent performance of the magnesia carbon brick depends on the existence of carbon in the brick, the oxidation of the carbon easily causes the deterioration of the product structure in the use process, slag intrudes into the brick along gaps to erode MgO particles, and the service life of the MgO-C brick is shortened are solved.

The invention discloses preparation and a formula of a high-strength, high-toughness and low-density wood fiber calcium silicate board. The board is low in density and high in breaking strength, especially the impact strength is greatly improved, and compared with a low-density calcium silicate board on the market at present, the breaking strength is generally about 8 Mpa, even 6 Mpa and 7 Mpa, the impact strength is lower, and no requirement is made. More than 50% of paper pulp is replaced by the wood fibers, perlite, diatomite and the like are not used, the cost is greatly reduced, steam isrecycled, perlite calcined at high energy consumption is not used, and energy conservation and emission reduction are achieved; the water absorption rate of the board is greatly reduced, and lithium silicate and potassium silicate are generated on the fiber surface in the board, so that the bonding capacity is improved, and the waterproof effect is achieved.

The invention belongs to the field of building materials, and especially relates to a high flexural strength composite Portland cement and a preparation method thereof. The high flexural strength composite Portland cement is prepared from, by weight, 35-65 parts of a Portland cement clinker, 17.5-40 parts of calcined clay, 10-22.5 parts of limestone and 1.5-5 parts of gypsum. The high flexural strength composite Portland cement mainly prepared from the ordinary Portland cement clinker, calcined clay and low-grade limestone concrete is prepared by starting from the concrete core raw material cement and improving the ratio of bending-compressive strength and the flexural strength of cement on the premise of ensuring a high compressive strength, and the preparation method has the characteristics of simple process, and suitableness for industrial production.