444 results about "Fiber-reinforced concrete" patented technology

Disclosed are apparatus and corresponding methodology for providing a base support, such as including concrete, and used such as for a wind-driven generator. Precast concrete cylinders are stacked in place upon a platform that may be partially precast and partially cast in place during assembly and supported, in certain embodiments, by plural concrete legs, the other ends of which are supported on a unitary or subdivided concrete foundation. In other embodiments, the platform may be supported by ribbed concrete panels. The concrete cylinders are glued together using an epoxy and then secured by an internal vertical post tension system extending from the platform to the upper most cylinder. Different types of concrete are used between upper and lower sections of the stacked cylinders. The lower section uses reinforced concrete while the upper section used ultra high performance fiber reinforced concrete.

The invention relates to a single plate force-bearing reinforcing method of a hollow slab bridge. The single plate force-bearing reinforcing method includes that the original bridge deck pavement is shoveled, hinge joint concrete is removed, defects and cracks of the original hollow slab bridge beam body are processed, strip-shaped steel plates are transversely pasted on the upper surface and the lower surface of the hollow slab bridge in the longitudinal bridge direction at certain intervals, split screws penetrate through drilled holes at the hinge joint position, a counter-force frame is arranged, a wedge-shaped block is embedded between the counter-force frame and the steel plates, and the steel plates are pressurized and pasted in sealing mode and then are positioned and fixed; the counter-force frame is demounted after sticky steel glue is cured; cavities in beam joints are subjected to pressure grouting, shear reinforcements are placed into the top surface of a hollow slab, a reinforcement mesh is reconstructed, and the bridge deck reinforcement mesh and the implanted reinforcements are connected in binding or point welding mode to form a whole body; steel fiber reinforced concrete is poured and waterproof coatings are sprayed; and bituminous concrete is paved. The single plate force-bearing reinforcing method improves transverse load distribution, steel plate pasting reliability and bridge integral force-bearing performance on the premise of preventing hollow slab beam body damage, not changing a structural force-bearing system and not interrupting the traffic.

The invention discloses a method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete and relates to fiber reinforced concrete. The method comprises the following key steps of: pouring a prepared steel fiber concrete mixture into a nonmetallic test mold and putting the test mold into a cavity in a framework of a coil of the special equipment for preparing the unidirectionally-distributed steel fiber reinforced concrete; putting the coil and the test mold on a vibrating table of the special equipment; switching on a direct current power supply of the special equipment to electrify the coil so as to form a magnetic field; applying the magnetic field to the prepared steel fiber concrete mixture so as to orient steel fiber; and keeping the direction of the magnetic field accordant with that of pulling stress during test piece testing or in a working state, wherein the special equipment consists of the vibrating table, the coil and the direct current power supply. Compared with steel fiber reinforced concrete prepared by the conventional method, the unidirectionally-distributed steel fiber reinforced concrete prepared by the method and the special equipment of the invention has breaking strength increased by 25 to 100 percent or saves the steel fiber by 25 to 60 percent.

A fiber-reinforced concrete-like material product includes a plurality of fibers containing an effective amount of at least one antimicrobial agent to inhibit organisms and protect the concrete from biological attack. Preferably, the antimicrobial agents are added to the fibers prior to the fibers being dispersed in the concrete. Such a concrete product containing antimicrobial-enhanced fibers simultaneously inhibits organisms from biological attack, reduces plastic shrinkage cracking of the concrete and improve post-peak flexural strength of the concrete.

The apparatus integrated with ceramic bushing/s for manufacturing mineral/basalt fibers from natural basalt rocks is disclosed. The apparatus and the ceramic bushing/s are integrated into one unit capable provide all operations which are needed: melt basalt rock materials, homogenize basalt glass body suitable for forming fibers to be drawn/attenuated into continuous fibers and gathered into a strand of elemental fibers from 7 to 20 micrometers (μm) in diameter. Also the coarse fibers at the diameters from 20 μm to 100 micrometers (μm) having amorphous structural state which exhibit ductile/flexible properties. The ceramic bushing/s are designed to eliminate precious Pt, Rd metals using instead corrosion resistant ceramic materials to reduce basalt fiber products cost and to increase its commercial compatibility when compared to the other fibers currently been on the market in reinforced concrete/composite applications, including Three Dimension Fiber Reinforced Concrete-3D FRC.

The invention relates to a testing method of steel fiber reinforced concrete fracture test crack initiation load, and belongs to the technical field of concrete cracking parameter testing. The testing method provided by the invention is characterized in that when a steel fiber reinforced concrete coped beam specimen cracks, a stress intensity factor of a prefabrication crack front edge achieves concrete fracture toughness, and the steel fibre blocking action is not exerted; the stress intensity factor generated by external load and concrete cracking toughness(i)K(/i) IC are equal, the external load value which is corresponding to a numerical value (i)K(/i)IC of the stress intensity factor generated by the external load can be used for determining the crack initiation load according to the curve relation graph of the external load and the stress intensity factor (i)K generated by the external load (img file='2014100081259100004dest_path_image002.TIF'wi='8'he='21'/)(/i)-(i)P(/i) curve relational graph. The testing method provided by the invenytion has the advantages that the required equipment, analyzing and processing method are simple, the cost is low, and the precision is high.

The invention relates to concrete used polypropylene coarse fiber and a preparation method thereof. The diameter or the equivalent diameter of a filament ranges from 0.08mm to 1.5mm with the corresponding titer of 40 to 14200 deniers, the fracture strength of more than 450MPa, the elastic modulus of more than 5000MPa and the breaking elongation of 10 percent to 30 percent. In the preparation method, polypropylene and the components of the polypropylene coarse fiber are dried to the extent that the weight is kept constant before the polypropylene and the components are mixed uniformly; after the mixture is extruded by the spinning die of a double screw extruder, the mixture is cooled in a water bath; subsequently, the mixture is graded and stretched for a plurality of times at the temperature higher than the glass transition temperature of polypropylene; on completion of the stretching, ordinary polypropylene spinning used oil solutions with the weight concentration of 5.0 percent are applied on coarse fiber bundles for thermoforming before the surface of the fiber is indented; finally, the fiber is cut and packaged according to required length. By adopting the concrete used polypropylene coarse fiber, the interface of the course fiber and a basal body has good acting force, thus improving the anti-cracking, the impermeability, the fold resistance, the toughness, the shock resistance, the freeze and melt resistance, the fire resistance, and the blast resistance of coarse fiber reinforced concrete.

The present invention relates to a high-performance mixed fibre reinforced concrete, its composition includes (by volume %) high elastic modulas fibre 1%-5%, low elastic modulus fibre 0.2%-3% and the rest general concrete, the described high elastic modulus fibre is one of steel fibre, carbon fibre and glass fibre, and the described low elastic modulus fibre is one of vinylon fibre, polypropylene fibre, acrylic fibre, nylon fibre and polyethylene fibre. Said invention can be used for making manhole cover which not only has higher strength, but also has higher impact resistance.

Disclosed are apparatus and corresponding methodology for providing a base support, such as including concrete, and used such as for a wind-driven generator. Precast concrete cylinders are stacked in place upon a platform that may be partially precast and partially cast in place during assembly and supported, in certain embodiments, by plural concrete legs, the other ends of which are supported on a unitary or subdivided concrete foundation. In other embodiments, the platform may be supported by ribbed concrete panels. The concrete cylinders are glued together using an epoxy and then secured by an internal vertical post tension system extending from the platform to the upper most cylinder. Different types of concrete are used between upper and lower sections of the stacked cylinders. The lower section uses reinforced concrete while the upper section used ultra high performance fiber reinforced concrete.

The invention discloses micro-expansion fiber reinforced concrete for a steel-concrete combined beam bridge panel wet joint and a preparation method of the micro-expansion fiber reinforced concrete, and relates to the preparation field of the micro-expansion fiber reinforced concrete. The micro-expansion fiber reinforced concrete comprises gel materials (cement, coal ash, slag powder and an expanding agent), aggregate, reinforcing materials, imitated steel fibers, a water reducer and water, wherein the 28 compressive strength of the micro-expansion fiber reinforced concrete is not lower than 69.0MPa, the 28d breaking strength of the micro-expansion fiber reinforced concrete is not lower than 7.0 MPa, the 28d splitting tensile strength of the micro-expansion fiber reinforced concrete is not lower than 5.0 MPa, the 28d elasticity modulus of the micro-expansion fiber reinforced concrete is not lower than 36.0 GPa, the cracking resistance level of the micro-expansion fiber reinforced concrete reaches L-IV level, the 28d bending toughness index I20 of the micro-expansion fiber reinforced concrete is not lower than 8, the 56d chlorine ion diffusion coefficient of the micro-expansion fiber reinforced concrete is lower than 4.0*10<-12>m<2>/s, the 21d shrinkage percentage of the micro-expansion fiber reinforced concrete is lower than 200*10<-6>. By using the preparation method, the shrinkage cracking of the micro-expansion fiber reinforced concrete can be effectively avoided, so that the reinforced concrete is relatively compact. The micro-expansion fiber reinforced concrete disclosed by the invention is relatively high in strength, relatively low in shrinkage percentage, good in bending toughness and durability, relatively low in cost and conveniently to widely use.

An innovation is disclosed which relates to a wind turbine foundation. A circular foundation using fiber reinforced concrete has optional circular reinforcement rods. The foundation includes a vertical stanchion that rests in the bottom of an excavated hole and supports anchor bolts and reinforcement bars in a predetermined configuration while concrete is poured into the hole. All the necessary foundation materials can be combined in a simple and compact kit which can be shipped to a customer.

An extremely ductile fiber reinforced brittle matrix composite is of great value to protective structures that may be subjected to dynamic and/or impact loading. Infrastructures such as homes, buildings, and bridges may experience such loads due to hurricane lifted objects, bombs, and other projectiles. Compared to normal concrete and fiber reinforced concrete, the invented composite has substantially improved tensile strain capacity with strain hardening behavior, several hundred times higher than that of conventional concrete and fiber reinforced concrete even when subjected to impact loading. The brittle matrix may be a hydraulic cement or an inorganic polymer. In an exemplary embodiment of the teachings, the composites are prepared by incorporating pozzolanic admixtures, lightweight filler, and fine aggregates in Engineered Cementitious Composite fresh mixture, to form the resulting mixtures, then placing the resulting mixtures into molds, and curing the resulting mixtures.

The apparatus is an underground reservoir to capture and slowly release stormwater runoff from impervious surfaces such as roads, rooftops, and parking areas. The structure is assembled from one or more modules comprising at least two side by side precast fiber reinforced concrete vaulted shaped chambers, each with side walls and an arch top. The side by side chambers have common walls with openings in the walls. Modules placed end to end are mated at reinforced concrete end walls that include lifting pins for moving the module. Ends of the chambers are closed, but the end walls have openings for feeding stormwater in and venting air out.

The invention discloses a cylindrical construction part provided with stiffening ribs and filled with steel fiber reinforced concrete. The cylindrical construction part comprises a square steel pipe which is vertically arranged, multiple vertical stiffening ribs which are respectively arranged on four side walls of the square steel pipe and a steel fiber reinforced concrete pillar which is formed through pouring steel fiber reinforced concrete filled in the lower part of the inner side of the square steel pipe, wherein the multiple vertical stiffening ribs are same in structure and size and are arranged in the same horizontal plane; and the vertical height of the multiple vertical stiffening ribs and the vertical height of a hollow steel pipe are same, the lower part of each vertical stiffening rib is a holed section with multiple through holes, the vertical height of the holed sections and the vertical height of the steel fiber reinforced concrete pillar are same, and the multiple through holes are arranged in a same vertical line from top to bottom. The cylindrical construction part provided by the invention has the advantages of simple structure, reasonable design and simpleness in construction, good stressing performance, and can overcome the problems of the conventional steel pipe concrete, such as large self weight, poor cohesive force between a steel pipe and concrete and poor structural integrity; moreover, the seismic performance of the integral structure is improved.

The invention discloses a high-stiffness composite tube formed through fixed length winding. The tube wall of the composite tube structurally and sequentially comprises an inside liner, an inner structure layer, an interface adaptation layer, an intermediate structure layer, an interface adaptation layer, an outer structure layer and an outer protective layer from inside to outside, wherein the inside liner, the inner structure layer, the outer structure layer and the outer protective layer are made of resin matrix composites, and the resin matrix composite is made of glass fibers and fabrics thereof, and resin; the intermediate structure layer is made of fiber reinforced concrete cement-based composite material; the interface adaptation layers are made of the mixture of organic bonding material and quartz sand. The prepared composite tube has the advantages that the stiffness of the composite tube is more than ten times of that of a commonly used glass steel tube at present, the weight of the composite tube is one third of that of a normal concrete pipe, the defects that the glass steel tube is low in stiffness and the concrete pipe is heavy are overcome, the cost of the composite tube is between the costs of the glass steel tube and the concrete pipe, and the composite tube is good in economic performance.

The invention discloses a preparation method and application of a nano glass fiber reinforced concrete material (e-GRC functional material). In the invention, a GRC material is used a photocatalysis carrier; TiO2 is used in glass fiber reinforced concrete; nano titanium dioxide is formed by mixing rutile and anatase at a ratio of (20:80)-(25:75); a multi-stage dispersion process is used; and fineglass fibers are substituted for steel bars in the traditional precast concrete, thus obtaining the nano glass fiber reinforced concrete material. The nano glass fiber reinforced concrete material has the self-cleaning function, can prevent and control air pollution, and is economical and practical. When being used in a building, the nano glass fiber reinforced concrete material can form a thin e-GRC coating on the surface layer of the building, thereby achieving the purposes of environment protection and energy saving.

A backstop for decelerating and trapping projectiles generally includes a support structure having an inclined surface and a projectile trapping medium disposed on the inclined surface. The projectile trapping medium may be either a resilient granular ballistic medium or a combination of a ballistic medium with a hydrated super absorbent polymer (SAP) gel. Preferably, the support structure is made of a shock absorbing, foamed, fiber-reinforced concrete, such as SACON(R). In embodiments, the support structure also includes an enclosure. Additives may also be mixed into the projectile trapping medium to control alkalinity and prevent leaching of heavy metals.

The present invention relates to a method for producing conductive-fiber cement-function-improved composite material, which resolves the problems of the prior art that the produced conductive-fiber cement-function-improved composite material has unfavorable disperse effect of the fiber, the fiber is easy to break, the electric conductivity is low and the function is poor. The preparation method comprises the steps: firstly, preparing the conductive fiber dispersion phase solution; secondly, preparing the cement pulp substrate; thirdly, adding the conductive fiber dispersion phase solution into the cement pulp substrate; fourthly, repeating the step two and the step three, and a billet with cement substrate being distributed with the conductive fiber at intervals is obtained, and the cement pulp substrate is poured on the upper surface of the billet; fifthly, after the poured cement pulp substrate is solidified, the die is removed, and the conductive-fiber cement-function-improved composite material can be obtained after the maintenance. The disperse effect of the fiber is good, and the fiber is free from being broken, and the conductivity is good, and the function of the material is favorable.

The invention discloses low-cost carbon fiber reinforced concrete and a preparation method and application thereof. The low-cost carbon fiber reinforced concrete is prepared from six components: 410-510kg/m<3> of cement (A); dispersant (B) accounting for 5wt%-15wt% of cement; water reducing agent (C) accounting for 0.5%-2.0% of the total weight of the component A and the component B; water (D) accounting for 30wt%-40wt% of cement; sand and stones (E); and low-cost carbon fiber (F) accounting for 0.5vol.%-2vol.% of the concrete, wherein according to that 1m<3> of the concrete is 2400kg, the sum of the total weight of sand and stones and the total weight of the component A, the component B and the component D is 2400kg, and sand accounts for 30%-40% (sand rate) of the total weight of sand and stones. In the preparation method disclosed by the invention, the high mechanical properties of carbon fiber is fully utilized to increase the toughness of the concrete; the single-recipe preparation cost of the carbon fiber concrete is reduced by 50%; and the low-cost carbon fiber reinforced concrete has the advantages of good quality, simple preparation process, low cost and the like, and is suitable for wide popularization and application.

The invention discloses an on-site concrete shear wall structure with a permanent heat insulation formwork and a construction process of the on-site concrete shear wall structure. The cross section of the shear wall structure comprises an inner side permanent heat insulation formwork layer, an outer side permanent heat insulation formwork layer and a reinforced concrete structure layer; and the permanent heat insulation formwork is composed of a high-performance fiber reinforced concrete layer and a light concrete heat insulation layer. The construction process includes precasting a welding steel rack with the permanent heat insulation formwork, mounting on site, pouring concrete and constructing the heat insulation layers and the shear wall structure synchronously. The permanent heat insulation formwork plays the role of both the heat insulation layer and the formwork, is taken as one part of the structure to work with the others, and is beneficial to saving of a large quantity of construction formworks; construction efficiency is improved; and the on-site concrete shear wall structure is a novel assembly integrated structure with combination of structure, heat insulation and formworks. By the technical scheme, service life of the structure is as the same as that of building heat insulation; problems of firmness and durability of the connection between the heat insulation layers and the structure are completely achieved; the structure is beneficial to engineering quality guaranteeing, construction period saving and construction cost reducing; and development in building industry is promoted.

A method of forming an exterior wall of a building, including the wall, includes the step of mounting a fiber-reinforced panel to the building. The panel has a plurality of masonry units protruding from the face thereof that are spaced from one another with a groove between each of the masonry units. The method includes mounting a second, similar panel to the building spaced from the first panel with a groove therebetween, and injecting mortar into the grooves between the masonry units and the groove between the panels. The mortar covers the grooves between masonry units and the groove between panels to look the same, thereby making it difficult to distinguish the repeat pattern.

A concrete reinforcing fiber assembly includes a plurality of first fibers and at least one co-fiber attached to at least some of the first fibers. The reinforcing fiber assembly has a water absorption capability of greater than 1.

The invention relates to an epoxy resin fiber reinforced concrete for repair and preparation and application methods thereof. The epoxy resin fiber reinforced concrete is prepared from the following raw materials in percentage by weight: 55-70% of refined quartz sands, 33-17% of epoxy resin, 11-9% of curing agent and 1-4% of basalt fiber chopped strands. The preparation method comprises the following the following steps: by using the refined quartz sands as aggregates and epoxy resin as a gel material, adding the basalt fiber chopped strands; and mixing according to an appointed proportion. The product provided by the invention is extremely high in viscosity, can be well combined with defected concrete of a base layer and is not easy to peel and bulge. The strength can reach the strength grade of concrete C50. The concrete is simple to manufacture, can be prepared on site and needs not to be heated on site. Epoxy resin needs not to be diluted, and the construction steps are saved and the concrete is convenient to use while no diluents are introduced. The product is short in curing time, and comes into use in 24 hours after repair. The concrete is strong in adaptability, can be suitable for repairing defects of thick and thin layers of a terrace at the same time and can be used for repairing various defects of terrace such as pits formed by collision or high-low difference due to differential settlement of the concrete terrace.