59results about How to "Increased splitting strength" patented technology

The invention belongs to the technical field of adhesives, and particularly relates to a high-impact-resistance acrylate structural adhesive. The high-impact-resistance acrylate structural adhesive contains rigid functional groups provided by hydrogenated bisphenol A and methacrylate functional groups which can enhance the curing pull strength and impact resistance. The toughening resin is added to greatly enhance the impact resistance. The high addition percent of the curing agent in the component B can ensure the whole system to quickly perform reaction and curing. After room curing is performed for 3-5 minutes, 70-DEG C hot pressing only takes 60 seconds. The high-impact-resistance acrylate structural adhesive has high impact resistance, can pass the disk knife test, and can still keep high bonding power after being cut a little. The structural adhesive has high forward pull strength, and the pull force test proves that the pull force at the copper nail is generally required to be greater than 20kg or the copper nail can shed. The structural adhesive has high temperature resistance and high humidity resistance, and the strength does not obviously decrease when the structural adhesive is at 60 DEG C under the 90% humidity condition for 7 days.

The invention discloses a concrete complexing agent as additive in the architectural material technical domain, which comprises the following parts: 48-55% silica, 27.5-45% fluorite, 2.5-8% sodium cetylsulfate, 4-9% hydroxy carboxyl acid and 0.5-1% aliphatic hydroxy sulfonate high-effective dehydragent. The complexing agent improves particle bond of concrete aggregate, which saves cement quantity by 10-20%.

The invention discloses an admixture for improving mechanical properties of cement-based materials. The admixture is aqueous dispersion of organic-inorganic hybrid particles, the organic-inorganic hybrid particles account for 5-40% of the aqueous dispersion, and each particle is in a two-layer structure including an inner layer and an outer layer. The inner layers comprise organic components and inorganic components, wherein no covalent bond exists between the organic components and the inorganic components, and the inorganic components and the organic components are respectively connected through covalent bonds to form a polymer network. Each outer layer is a layer of electronegative organic polyelectrolytes with long side chains. The admixture for improving the mechanical properties of the cement-based materials is beneficial to improvement of compressive strength of the cement-based materials, and the more the admixture is doped, the more evidently the mechanical properties of the cement-based materials are improved.

The invention discloses high performance concrete containing composite fiber. The problems in the existing high performance concrete of being large in fiber adding amount and poor in mechanical performance, stretching toughness and bend ductility are solved. The technical scheme is that the high performance concrete comprises the concrete and the composite fiber. Based on 100% of volume of the concrete, mixing rate of the composite fiber is 0.8-1% of the concrete volume, and the composite fiber is composed of steel fiber, plastic steel fiber and polypropylene monofilament fiber. The concrete is good in comprehensive mechanical performance of concrete crushing strength, splitting tensile strength, toughness, bend ductility and the like, low in fiber adding amount and wide in application range.

The invention belongs to the technical field of power transmission line construction projects and particularly relates to a pole shock-resistant mechanism. The pole shock-resistant mechanism provided by the invention comprises a base, wherein a positioning groove is formed on the upper end face of the base; a vertically oriented spiral pressure spring is arranged between the bottom of the pole and the positioning groove to close the bottom of the pole and the base; a disc loop is arranged around the pole; isometric round holes are formed on the disc loop; and the base and the disc loop are poured by concrete. The pole shock-resistant mechanism provided by the invention can effectively improve the ductility, the transverse shearing capacity and the bending bearing capacity of the pole, so that the reliability of the pole is improved, and the safety and stability of power transmission lines are ensured.

The invention relates to full-light high-strength concrete for a fabricated prefabricated part. The full-light high-strength concrete comprises the following components in parts by weight: 45-55 partsof cement, 45-55 parts of ceramsite, 38-55 parts of pottery sand, 15.5-17.5 parts of fly ash, 9-35 parts of steel fibers, 22-44 parts of high-performance fibers and 1.0-1.5 parts of a water reducingagent. Compared with the prior art, the prepared concrete is uniform in distribution; the weight is light, the strength is high, and the self-heat-preservation performance is good; the concrete has good tensile deformation resistance and light specific gravity, so that the full-light concrete has toughness, various properties of the concrete are effectively improved, the volume weight of the concrete is greatly reduced, the compressive strength is ensured, the full-light high-strength concrete is simple in preparation process, environment-friendly and easy to construct, and the concrete has good popularization value.

The invention discloses high-crack-resistant palm fiber self-compacting concrete. The high-crack-resistant palm fiber self-compacting concrete comprises cement, pulverized fuel ash, river sand, limestone, water, a water reducing agent and palm fibers, wherein the content of the cement is 320-380kg/m<3>; the content of the pulverized fuel ash is 170-230kg/m<3>; the content of the river sand is 780-860kg/m<3>; the content of the limestone is 920-980kg/m<3>; the content of the palm fibers is 0.6-1.5kg/m<3>; the content of water is 175-240kg/m<3>; the content of the water reducing agent is 10-12.5kg/m<3>. By virtue of the adoption of the design, the palm fibers are doped into the existing the concrete, so that the compressive strength, the splitting tensile strength and the crack resistance of the concrete are effectively improved; the integrated performance of the concrete is improved; meanwhile, the high-crack-resistant palm fiber self-compacting concrete is low in cost and has good market prospect and good popularization value.

The invention discloses river-sand basalt-fiber active powder concrete and a preparation method thereof. The river-sand basalt-fiber active powder concrete is prepared from the following components inparts by weight: 750 to 950 parts of cementing material, 1,200 to 1,500 parts of river sand, 40 to 55 parts of water reducer, 150 to 190 parts of water and 20 to 40 parts of composite fiber or 15 to35 parts of basalt fiber subjected to surface spraying treatment, wherein the cementing material is prepared from cement, pulverized fuel ash, mineral powder and silica fume, which are further in a weight ratio of (4 to 7) to (2 to 3.5) to (1 to 2.5) to (1 to 2.5); the composite fiber is prepared from a basalt fiber and a polyvinyl alcohol fiber; the basalt fiber subjected to the surface sprayingtreatment refers to a basalt fiber treated by using an organic silicon oiliness additive. The invention also provides the preparation method of the active powder concrete. A finished product is prepared through soaking the fiber, pre-homogenizing the cementing material, curing with water and thermally curing with steam. The finished product is obviously improved in main mechanical performance, hasfavorable corrosion resistance, high and low temperature resistance and weather resistance at the same, is stable in performance, is green and environmentally friendly, and is low in cost.

The invention discloses a method for preparing slag polypropylene fibre concrete. The sand and stones are mixed according to the mass ratio of 1:1.61, and cement, slag, polypropylene fibre, polyocarboxy acid superplasticizer and water are weighed up, wherein the cement content in concrete is between 0.17 to 0.32 percent; the slag content in concrete is between 0.17 to 0.32 percent; the polypropylene fibre is added according to the volume ratio of polypropylene fibre and concrete of between 0.2 to 0.6 percent; the adding quantity of the polyocarboxy acid superplasticizer is between 3.52 to 11.55ml/kg; the water content in concrete is between 0.17 and 0.22 percent; the concrete of the invention can be directly applied to concrete engineering in fields such as water conservancy, traffic and urban construction, etc., particularly the concrete structure engineering having requirements on tensile stress bearing, repeated dynamic load and anti-fatigue. Because a large amount of slag is added, the cement consumption is reduced, and the polyocarboxy acid superplasticizer is introduced in the preparation of the concrete, under the condition of reducing the manufacturing cost of concrete, the durability of concrete is improved, so that the application of the slag polypropylene fibre concrete can generate bigger economic and social benefits and more obvious ecological benefits.

The invention discloses a glass fiber reinforcement polyester resin motor slot wedge which comprises the following raw materials, by weight, 10-15% of unsaturated polyester resin, 50-55% of twistless glass fiber roving, 15-20% of bamboo powder, 5-10% of modified limestone, 2-3% of aluminum hydroxide, 4-6% of yellow dextrin, 1-2% of hardening agent, 0.5-1.5% of internal releasing agent 352. The slot wedge prepared through the method has high mechanical strength and dielectric property, and good heat-resistant property and moisture-resistant property. Moreover, an insulation grade of the slot wedge is F, the resistant high temperature reaches 150 DEG C to 160 DEG C, high split-resistant strength maintained at the high temperature can reach over 900 MPa / 10mm, and operation requirements of motors are completely met.

The invention relates to a new type of shotcrete, that is, basalt fiber shotcrete, in which a certain amount of basalt fiber and fly ash are added on the basis of the original shotcrete, and is especially suitable for the construction of thermal damage tunnels. Make full use of the advantages of basalt fiber and concrete, improve the splitting strength and bonding strength of shotcrete, and realize the composite material design concept of "superimposition of performance and economic effect".

The invention discloses an antifreezing asphalt pavement. The antifreezing asphalt pavement comprises a base layer and an asphalt pavement layer, wherein the asphalt pavement layer is prepared form materials in parts by mass: 60 to 83 parts of asphalt, 5 to 15 parts of polyurethane, 13 to 20 parts of resin, 18 to 40 parts of diluent, 0.8 to 2 parts of additive, 0.5 to 2 parts of polyimide/montmorillonoid nanocomposite and 0.1 to 0.7 part of stabilizer. The antifreezing asphalt pavement has the advantages of good antifreezing performance, more safety and prolonged service life.

The invention discloses a bidirectional glass fiber drawing groove wedge and the production method thereof. The bidirectional glass fiber drawing groove wedge is characterized in that: the finished product contains 52-64% of alkali free glass fiber packing, and 36-48% of cured resin. The production method comprise: preparing glue; impregnating alkali free glass fiber; cutting the shaped groove wedge and grinding head; washing and drying in air; performing surface treatment and drying in air; inspecting finished products; sorting and packaging. The invention is characterized in that: a glass fiber woven sleeve is disposed out of the alkali free glass fiber after the first impregnation before the second impregnation; and the alkali free glass fiber and the glass fiber woven sleeve after the second impregnation are moulded by pultruding. The bidirectional glass fiber drawing groove wedge has both longitudinal strength and latitudinal strength, and better thermal state performance; the production method includes two impregnations; and the glass fiber packing is combined by a plurality of structures; thereby, the solidification is more completely, and the solidified groove wedge has better integrity.

The invention discloses a composite material for preparing crack-free cement stabilized macadam and a preparation method of the composite material, and belongs to the technical field of road buildingmaterials. The composite material comprises micro-expansion moisture-preserving anti-cracking mineral powder and anti-cracking fibers, and the weight ratio of the micro-expansion moisture-preserving anti-cracking mineral powder to the anti-cracking fibers is 100:(8-20). The preparation method comprises the following steps: 1) adding micro-expansion moisturizing anti-cracking mineral powder into astirrer; 2) adding anti-cracking fibers while stirring; and 3) conducting full stirring, bagging and packaging. Compared with an existing semi-rigid base layer, the invention effectively solves the problem of cracking of a semi-rigid base layer. The preparation method is simple, quality control is convenient, the anti-cracking capacity of the semi-rigid base layer can be effectively improved, cracks are avoided, and therefore the purposes of improving the durability of the semi-rigid base layer and an asphalt pavement and prolonging the service life of the pavement are achieved.

The invention relates to the technical field of motor, and in particular, relates to a magnetic motor slot wedge and a preparation method thereof. The invention provides the magnetic motor slot wedgecomprising the raw materials by the weight percentage: 16%-20% of unsaturated polyester resin, 0.2%-0.6% of an internal demoulding agent, 0.5%-0.9% of tert-butyl peroxybenzoate, 0.3%-0.6% of dibenzoylperoxide, 35%-43% of a reduced iron powder, 17%-23% of alkali-free glass fibers, 1.5%-3.5% of an iron-cobalt alloy powder, 3%-5% of an iron-silicon alloy powder and the like. The invention also provides the preparation method of the magnetic motor slot wedge. The prepared magnetic motor slot wedge has the characteristics of high magnetic conductivity, high splitting strength and high bending strength, can make the temperature rise and the noise reduce in operation of an electric generator, improves the efficiency and service life of a motor, and reduces the maintenance cost.

The invention belongs to the technical field of road engineering, and discloses a high-performance cement-emulsified asphalt mixture and a preparation method thereof. The high-performance cement-emulsified asphalt mixture comprises coarse aggregate, fine aggregate, emulsified asphalt, a mineral filler, an additive and water. The preparation method comprises the following steps: fully mixing waterfor mixing, the emulsified asphalt, the mineral aggregates, the filler and the additive in a mixing device, uniformly stirring, carrying out magnetization treatment on the obtained mixture through a magnetic field with a preset intensity according to a certain discharge rate, and carrying out paving molding through a paving machine. The asphalt mixture prepared by adopting the preparation method and the optimized material blending proportion shows excellent construction workability and pavement effect; and compared with a traditional cold-mixed asphalt mixture, the mixture of the invention hasthe following advantages: the strength forming time is short, the splitting strength of the mixture is obviously improved, and the fatigue life of the mixture is obviously prolonged.

The invention relates to the technical field of concrete. The concrete for road construction is prepared from the following materials in parts by weight: 40 to 60 parts of cement; 30 to 40 parts of sand; 20 to 30 parts of mineral powder; 50 to 67 parts of stone; 18 to 32 parts of water; 1 to 3 parts of plant fiber; 0.5 to 2 parts of a water reducing agent; and 2.5 to 4 parts of montmorillonite. The concrete provided by the invention has the advantages of excellent compression resistance and high splitting strength.