52results about How to "Improve flexural toughness" patented technology

The invention discloses a polymer modification blast-furnace slag powder material.The material is prepared from, by weight, 16.1-25.9% of blast furnace slag powder, 61.4-71.7% of silica sand, 1.0-1.9% of sodium hydroxide, 3.3-4.7% of a sodium silicate water solution, 6.0-7.9% of water and 0.01-0.75% of high-molecular polymer.The high-molecular polymer is sodium polyacrylate or polyacrylamide or polyvinyl alcohol.The polymer modification blast-furnace slag powder material has the high ultimate bending strength, high bending toughness and low elastic modulus, the deformation performance can be remarkably improved, the defects that the breaking strength is low and the brittleness is large are overcome, and meanwhile the polymer modification blast-furnace slag powder material has the advantages of resisting high temperature, resisting chemical corrosion, being good in anti-permeability, low in shrinkage rate and the like.

The invention provides an anti-knocking steel box beam bridge deck paving structure and a paving method and belongs to the technical field of traffic transportation and the field of protection of bridge engineering. In the structure, the upper layer is an asphalt concrete wearing layer and the lower layer is a GFRP (Glass Fiber Reinforced Polymer)-composite concrete anti-knocking pavement layer, namely, a waterproof layer (2) is arranged on a steel box beam orthotropic bridge deck slab (1); a lower adhesive layer (3) is arranged on the waterproof layer (2); the GFRP-composite concrete anti-knocking pavement layer (4) is arranged on the lower adhesive layer (3); an upper adhesive layer (5) is arranged on the GFRP-composite concrete anti-knocking pavement layer (4); the asphalt concrete wearing layer (6) is arranged on the upper adhesive layer (5). The paving method comprises the following steps: (a) derusting a steel bridge deck by sandblasting; (b) performing anticorrosive coating on the steel bridge deck slab, and arranging the waterproof layer in a sprinkling way; (c) forming the lower adhesive layer on the waterproof layer in a coating mode; (d) strapping a GFRP glass fiber reinforced bar net, and then pouring high-strength high-toughness light composite concrete; (e) carrying out vibrating and maintaining, and afterwards adhering a GFRP glass fiber reinforced sheet on the upper surface of the concrete layer; (f) laying coarse sand on a contact surface between the GFRP sheet and the asphalt pavement layer, and arranging the upper adhesive layer in a sprinkling way; and (g) laying the asphalt concrete wearing layer.

A wrapping type reinforcement solidification method for a roadbed of a high filled embankment is implemented as follows: solidified soil material making, concretely, the solidified soil material is made by uniformly stirring a soil curing agent and filler soil; reinforcement laying, concretely, reinforcements are horizontally crosswise arranged and completely paved on the surface of a lower bearing layer after being leveled in full width, a fixed geogrid is inspected and aligned while being pulled and paved forwards, and the reinforcements are flattened and straightened; solidified soil material paving, concretely, the solidified soil material is paved on the geogrid layer by layer, each layer is ground and formed after being paved uniformly, and grinding is conducted till the filling elevation of wrapping reinforcement solidified soil is reached; wrapping and reinforcement stretching, concretely, the reinforcements of the preserved reinforcement sections at the both sides are inflected upwards to wrap the outer side of the solidified soil material by certain length, and the inflected reinforcements at the both sides are connected by reinforcement stretching strips and paved longitudinally at an equal interval, to form a reinforced solidification wrapping body; and curing and molding, concretely, field soil covers or geomembrane caps the upper parts of the reinforced solidification wrapping bodies for 7-14 days for curing. According to the invention, the light reinforced structure with good deformation compatibility is provided, the dead-weight can be reduced, and thus the load borne by a foundation is effectively decreased.

The invention discloses hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete is prepared from ordinary Portland cement, water, sand, gravel, polyvinyl alcohol fibers, crude polyolefin fibers and a water reducing agent. In the preparation process, the gravel, the sand, the cement and the crude polyolefin fibers are firstly poured into a blender and evenly stirred, then a mixed solution of the water reducing agent and the water is poured into the blender, and when the mixture is converted into a colloidal state from a particle state, the polyvinyl alcohol fibers are mixed for stirring; after the fibers are evenly dispersed, briquette pouring and maintenance are carried out. According to the hybrid fiber high-crack-resisting and high-tenacity airfield pavement concrete and the preparation method thereof, the crack resistance and tenacity of cement concrete can be remarkably improved, the durability of a civil aircraft airfield pavement in China can be improved, the structural quality of the airfield pavement can be comprehensively improved, the service life can be prolonged, and a large amount of maintenance and rebuilding cost is saved for the country.

The invention relates to an EVA shoe sole and a preparation process thereof. The EVA shoe sole comprises the following components in parts by weight: 50-70 parts of EVA, 20-30 parts of modified low-density polyethylene, 10-20 parts of a filler, 10-15 parts of a flame retardant, 5-8 parts of color master batch, 2-4 parts of a foaming agent, 0.4-0.8 part of a bridging agent, 0.2-0.4 part of an accelerant, 0.5-0.6 part of stearic acid, 0.3 to 0.5 part of N,N'-ethylene bisstearamide, and 0.1 to 0.2 part of triallyl isocyanurate, wherein the modified low-density polyethylene is a jute fiber/nitrilerubber/low-density polyethylene compound. The preparation process comprises the steps: S1, banburying; S2, open milling; S3, cooling; S4, slitting; S5, mold pressing; and S6, edge trimming. The produced shoe sole has good anti-cracking performance.

The invention relates to a structurally reinforced synthetic fiber for concrete. The synthetic fiber is prepared by processes of fusion, spinning, dispersion and fixing, and the synthetic fiber comprises the following components: 20 to 70 percent of polypropylene, 25 to 75 percent of polyethylene, 0 to 25 percent of polyamide, 0.05 to 0.5 percent of nucleating agent and 0.1 to 0.5 percent of antioxidant. The synthetic fiber of the invention has rough surface and clear contour, and has good dispersibility and cement basal body with excellent cementing property; the product has not only the functions of steel fibers, but also advantages of synthetic fibers, so that the synthetic fibers of the invention is mainly used to replace weld metal screens and steel fibers in the concrete panel structure for improving the bending resistant, shock resistant and fatigue resistant performance of concrete.

The invention proposes a high-wear-resistant composite alloy ring and its preparation process, which includes an annular alloy steel base material, a transitional infiltrated layer, and a hard alloy cladding layer. The transitional infiltrated layer has a thickness of 0.2-0.7mm and is hard The thickness of the alloy cladding layer is 1-3mm. Through reasonable raw material ratio and coating selection, arc-added glow ion plating technology and synchronous laser cladding technology are used to treat the base material respectively, and a composite alloy with three-layer structure is obtained. The ring, base material, permeable layer and cladding layer are well combined, have excellent wear resistance, corrosion resistance, toughness and stability, high surface density, significantly improved mechanical properties, and effectively prolong the service life of the product.

The invention discloses a rubber particle surface modifier for road cement concrete, which relates to a wasted rubber particle surface modifier used in road-use cement concrete. The mixture ratio of the modifier is as above: the modifier has wild material source, low price and convenient manufacture, which can carry out the modification treatment to the rubber particles in a wasted rubber particle processing plant or a concrete mixing location, the modified rubber particles can be directly packaged in a damp state or be properly dried and packaged to leave the factory. Compared with the unmodified rubber particle one, the cement concrete prepared by modified wasted rubber particles can increase the compressive strength by 20%, the breaking strength by 10%-30% and the flexural toughness by 30%-50% under the condition of the same fluidness, thereby having valuable economic and social benefit.

The invention discloses a production method of polypropylene crude fiber and an application method of the combination of the polypropylene crude fiber and organic nano material combined in sprayed concrete. The application method is characterized by comprising the following components in parts by weight according to the feeding sequence: 900 parts-1226 parts of sands, 680 parts-820 parts of stones, 3-14 parts of polypropylene crude fiber, 350 parts-516 parts of cement, 8 parts-60 parts of organic nano materials, 208 parts-312 parts of water and an additive, and stirring uniformly to form the sprayed concrete. In short, due to the adoption of the polypropylene crude synthetic fiber and the organic nano composite materials, the performances of crack control, permeability prevention, bending resistance, toughness, fatigue resistance, impact resistance, frost resistance and fire resistance and explosion resistance of the crude fiber sprayed concrete can be improved obviously.

The invention discloses a toughening method for a cement-based material. The method comprises the following steps of selection of raw materials, design of a mixing ratio and mixing of the raw materials. The selection of the raw materials further comprises the following steps of gel material selection, fine aggregate selection, coarse aggregate selection, polymer selection, fiber selection and water reducing agent selection. According to the method, a composite technology for industrial waste residues, fibers, polymers and cement clinker is adopted, the performance of each composition with different chemical components is superposed in a structure forming process, the compositions gradually play a role step by step at the corresponding performance level, and the effect of complementing advantages is achieved; the capacity of reinforcing and toughening a cement matrix is greatly improved .The high-performance cement-based composite material with the strength grade of 60 MPa is prepared,and the bending toughness and fracture performance of the material are improved.

The invention discloses a preparation method of an anti-puncture breathable sole, and belongs to the technical field of labor protection articles. The preparation method is characterized in that: composite fibers are firstly formed, carbon nanotubes are contained in the composite fibers, the carbon nanotubes are evenly distributed in a net-shaped structure formed by acrylic resin under the actionof ultrasonic dispersion, and therefore the prepared composite fibers are high in tensile strength and good in bending toughness; and after molding, the sole has an extremely strong anti-puncture effect, a honeycomb foaming body integrally molded by foaming is arranged between the outsole and the midsole, and the honeycomb foaming body is exposed on the surface of the midsole and the side surfaceof the outsole, so that after the safety shoe is manufactured, air in the shoe can be ventilated and dissipated through the honeycomb foaming body, and when the midsole is subjected to the action force of stepping, the honeycomb foaming body can improve the wearing flexibility of the sole, and meanwhile, the puncture resistance is not influenced.

The invention discloses waterproof concrete. The waterproof concrete comprises components as follows: 42.5R ordinary Portland cement, a foaming agent, a coagulation accelerator, a water reducing agent, a foam stabilizer, a waterproof agent and nano-SiO2. The invention further discloses a concrete member and a preparation method thereof. Pores in the waterproof concrete become smaller and more uniform, degree of sphericity is increased, and communication ratio of the pores is reduced; plastic shrinkage cracking value is reduced by 82.1%, cracks of level 2 or higher of plastic shrinkage cracks disappear, and proportion of cracks of level 1 is as high as 70.1%; 3d breaking strength and compressive strength are increased by 41.7% and 16.0% respectively, and 28d breaking strength and compressive strength are increased by 25.0% and 10.0% respectively; certain bearing capacity and better pseudo-ductility can be kept in a period of time after initial cracking of a sample, and bend ductility is remarkably improved.

The invention provides a steel fiber cement-based composite material based on nanoscale reinforcement and a preparation method thereof, and relates to the technical field of cement-based composite materials. The composite material provided by the invention is prepared from the following components in percentage by mass: 25 to 40 percent of cement, 7.5 to 10.5 percent of silica fume, 35 to 50 percent of river sand, 5 to 7.5 percent of water, 1 to 1.5 percent of water reducing agent, 5 to 9 percent of steel fiber and 0.01 to 0.15 percent of nano cellulose fiber. A small amount of nano cellulose fibers are added into the steel fiber cement-based composite material, a steel fiber-cement matrix interface transition area is subjected to nano-scale improvement in a mode of reinforcing a matrix through the nano-crystalline cellulose fibers, and the mechanical property can be remarkably improved under the condition of low steel fiber mixing amount; the nano-crystalline cellulose fiber has hydrophilicity and can be tightly combined with the cement matrix, so that the mechanical property of the composite material can be improved; and the nano cellulose fiber also has the characteristics of wide material sources and environmental protection.

The invention relates to the technical field of ecological slope protection substrates, and specifically discloses a green ultralight crack-resistant polyvinyl alcohol substrate and a preparation method thereof. The preparation method comprises the following steps: (1) weighing raw material soil, and carrying out drying and sieving for subsequent usage; (2) adding a curing agent into sieved raw material soil, and carrying out uniform mixing; (3) adding water into a mixture obtained in the step (2), and carrying out uniform mixing under stirring; and (4) adding polyvinyl alcohol powder, polyvinyl alcohol fiber, a gelling agent, a filling material, an anti-foaming agent, a wetting agent, a preservative and a pigment into a mixture obtained in the step (3) according to certain addition amounts, and carrying out uniform mixing under stirring. The lightweight material provided by the invention guarantees the strength of a composite soil body to meet the ecological protection requirements of a slope, has the advantages of cracking resistance, impermeability, erosion resistance, ultralight weight, beautiful appearance and the like at the same time, reduces the load of a slope surface, can prevent slope protection plants from dying due to soil loss, provides a green element to the slope surface before vegetation germination, avoids visual fatigue caused by a dark substrate, and enables the slope surface to achieve a landscape effect.