42 results about "Flexural toughness" patented technology

The invention provides crack-resisting mortar for insulation of a modified rubber powder and a preparation method thereof. The crack-resisting mortar for insulation comprises the following raw materials in parts by weight: 5-60 parts of modified rubber powder, 50-110 parts of cement, 10-50 parts of sand, 0.5-2 parts of polypropylene fiber, 0.5-3 parts of dispersible latex powder, 2-3 parts of quick lime, 0.1-1 part of cellulose ether and 0.01-0.03 part of air entraining agent. The preparation method comprises the following steps: preparing a modifier; preparing the modified rubber powder; carrying out air-drying for later use; and carrying out mix preparation so as to obtain the crack-resisting mortar for the insulation of the modified rubber powder. Compared with the crack-resisting mortar for the insulation of the unmodified rubber powder, the compression strength, rupture strength and flexural toughness of the crack-resisting mortar in the invention are improved under the same flowability condition, wherein the rupture strength is larger than 450kpa, the compression strength is larger than 700KPa, the bonding strength is more than 180KPa, linear shrinkage is less than 1%, and the softening coefficient is more than 0.9. The crack-resisting mortar in the invention has a huge effect in the building field and a wide market prospect.

The present invention relates to a novel flexible composite shotcrete layer support material which comprises the following components in parts by weight: 80-100 parts of cement, 80-120 parts of sands, 100-120 parts of stones, 60-100 parts of rubber particles, 40-60 parts of coal ash, 20-30 parts of hooked end steel fibers, 50-80 parts of water, 6-7 parts of a crosslinking agent, 5-8 parts of an additive, 2-10 parts of polyamic acid resin with a solid content of 10%-25% and 3-5 parts of a 1% silane coupler solution. The prepared shotcrete layer material is greatly improved in compression strength, rupture strength and flexural toughness. The novel flexible composite shotcrete layer support material can be applied to the field of support to surrounding rocks of complex rock layers with characteristics of high stress, soft rock, expansion, flowing deformation, fault structure fracture zones, mining influence and the like or other dynamic pressure tunnel as well as the field of underground engineering of tunnels, subways and the like.

The present invention relates in general to implantable compositions, and method for preparing same, containing a calcium salt-containing component, optionally demineralized bone, a plurality of discrete fibers, optionally a flow additive, and optionally continuous reinforcing fibers or an array of organized fibers in the form of mesh. Advantageously, the discrete fibers have a specific aspect ratio (length / diameter) from about 50:1 to about 1000:1. The addition of a small amount of discrete fibers and / or the continuous reinforcing fibers or fiber mesh can cause drastic increases in certain mechanical properties including flexural strength, flexural strength, flexural toughness, and / or screw pullout strength.

The invention provides crack-resisting mortar for insulation of a modified rubber powder and a preparation method thereof. The crack-resisting mortar for insulation comprises the following raw materials in parts by weight: 5-60 parts of modified rubber powder, 50-110 parts of cement, 10-50 parts of sand, 0.5-2 parts of polypropylene fiber, 0.5-3 parts of dispersible latex powder, 2-3 parts of quick lime, 0.1-1 part of cellulose ether and 0.01-0.03 part of air entraining agent. The preparation method comprises the following steps: preparing a modifier; preparing the modified rubber powder; carrying out air-drying for later use; and carrying out mix preparation so as to obtain the crack-resisting mortar for the insulation of the modified rubber powder. Compared with the crack-resisting mortar for the insulation of the unmodified rubber powder, the compression strength, rupture strength and flexural toughness of the crack-resisting mortar in the invention are improved under the same flowability condition, wherein the rupture strength is larger than 450kpa, the compression strength is larger than 700KPa, the bonding strength is more than 180KPa, linear shrinkage is less than 1%, and the softening coefficient is more than 0.9. The crack-resisting mortar in the invention has a huge effect in the building field and a wide market prospect.

The invention discloses an ultra-high performance concrete for an expansion joint transition area. The ultra-high performance concrete is prepared from the following main raw materials: cement, fly ash microbeads, silica fume, high-titanium heavy slag sand, organic-inorganic hybrid fiber, a waterborne epoxy emulsion, a water reducing agent and water. According to the invention, the high-titanium heavy slag sand is used as aggregate, the internal curing and pin effects of the aggregate are utilized to improve the volume stability, anti-permeability and cracking resistance, and mechanical properties of the concrete; an organic-inorganic fiber composite toughening technology is adopted to enhance the bending toughness and impact resistance; the water reducing agent and fly ash microbeads areadded to improve the working performance and compactness; and the obtained ultra-high performance concrete has the advantages of high flow state, low shrinkage, high toughness, high adhesion, high impact performance, fatigue resistance and the like, can fundamentally solve the problems of repeated repairing, repeated damage and the like of concrete in expansion joint transition areas, and has important practical application value.

The invention discloses a chitosan modified geopolymer cementing material. Chitosan is added into an alkali excitant to be sufficiently stirred and dissolved to obtain mixed solution; then the mixed solution is gradually added into a salic solid material to be stirred and uniformly mixed; the obtained product is injected into a die to perform a reaction, and after demoulding, maintenance is carried out to obtain the chitosan modified geopolymer cementing material. According to the chitosan modified geopolymer cementing material disclosed by the invention, the salic solid material is used as a main raw material; excitation is carried out by the alkali excitant; chitosan is used as a main toughening agent; a type, a mixing amount and a mixing mode of each raw material and a modulus and an alkali equivalent weight of the alkali excitant when the chitosan is used for carrying out toughening modification are determined; the system has excellent mechanical performance in a normal-temperature maintenance environment; a ratio of compressive strength of the material is obviously reduced and flexural toughness of the material can be obviously improved; as one type of cementing material, geopolymer can be applied to a concrete component with a high requirement for flexural toughness.

The invention discloses a gypsum base material imitation wood board and a wood square, a preparation method thereof and a composite gypsum board. The gypsum base material imitates wood planks and wooden squares, and the raw materials, in parts by weight, include: 80-120 parts of gypsum powder, 5-10 parts of silica sol, 2-10 parts of latex powder, 1-3 parts of chopped glass fiber, wood 0.5-1 part of fiber, 0.1-0.4 part of dispersant and / or water reducing agent, 0.1-0.3 part of crystallizing agent, 0.2-0.5 part of foaming agent and 45-70 parts of water. The gypsum products provided by the invention all have the advantages of low density and high strength, and have obvious effect of imitating wood. At the same time, according to different application occasions, products with different densities, flexural and compressive strengths, hardness and bending toughness can be produced.

The invention relates to a hybrid fiber-reinforced toughened high-strength self-compacting concrete and a preparation method thereof. The invention belongs to the technical field of concrete, and solves the disadvantage that the conventionally prepared self-compacting concrete cannot improve the basic mechanical properties of the concrete while improving its bending toughness. The concrete is mixed with nano-carbon fiber and copper-plated micro-wire steel fiber, and the compression resistance, splitting, flexural strength and bending toughness are all significantly improved, and can be applied to over-dense reinforcement, thin-walled, Complex shapes and other structures. The preparation method is to weigh cement, fly ash, silica fume and copper-plated microwire steel fiber by weight and put them into the mixed aggregate, mix evenly, and mix nano-carbon fiber and polycarboxylate superplasticizer with a ratio of 1:2 The mass ratio is added to an appropriate amount of water, and the nano-carbon fiber mixture is obtained by ultrasonic dispersion; finally, the remaining water, polycarboxylate high-efficiency water reducer and nano-carbon fiber mixture are put into the dry material, and stirred evenly, that is, nano-carbon fiber and copper-plated microfiber Wire-steel fiber hybrid fiber-reinforced concrete.

The invention discloses synthetic fiber concrete and a preparation method thereof.The synthetic fiber concrete is doped with 0.9-2.0 kg / m3 of synthetic fiber, and the synthetic fiber comprises a fiber trunk and fiber branches arranged at intervals in the length direction of the fiber trunk. The diameter of the fiber trunk is 2-10 times that of the fiber branches, and the length of the fiber trunk is 3.1-3.4 times that of the fiber branches. The bending toughness of the concrete can meet certain requirements under the condition that 0.9 kg / m3 of synthetic fibers are doped only by changing the shape and structure of the fibers doped into the concrete without adding other dispersing agents with a dispersing effect.

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 particleprocessing 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 by30%-50% under the condition of the same fluidness, thereby having valuable economic and social benefit.

When a reinforcing mesh (or wire mesh) concrete support structure is adopted in projects of tunnels, side slopes, coal mine tunnels and the like by an injection process, concrete needs to be sampled and tested in order to test flexural toughness of concrete. The method for sampling a round specimen plate (sample) during flexural toughness testing of concrete is based on a new mold (see an attached drawing in an abstract of the description): the round reinforcing mesh (or wire mesh) concrete sample which meets requirements of the disc-process concrete flexural toughness testing can be prepared; the concrete specimen plate dismounting process is simplified, and the damage of dismounting mold to the sample is reduced; and mechanical property of the sample remains consistent with mechanical property of the reinforcing mesh (or wire mesh) concrete support structure in practical engineering to the maximum extent. The application aims to provide a new method for preparing the round reinforcing mesh (or wire mesh) concrete sample for concrete flexural toughness tests at the construction sites of tunnels, side slopes, coal mine tunnels and the like.

The invention discloses a bending toughness tester for fiber reinforced concrete. The bending toughness tester is characterized in that a servo motor is fixed on the top of a vertical three-layer support framework; an output shaft of the servo motor is vertically stretched downwards into the framework and connected with the upper end of a screw rod of a ball screw rod nut pair through a speed reducer and a coupler, and the ball screw rod nut pair is vertically arranged in the center of the support framework; the lower end of the screw rod is movably stretched into a hollow inner cavity of a pushing rod; the upper end of the pushing rod is fixed on a nut of the ball screw rod nut pair; the lower end of the pushing rod is locked with an inclined-plane gasket and a spoke type sensor integrally through a stressed stud which penetrates through central thread holes of the pushing rod, the inclined-plane gasket and the spoke type sensor; a jacking head is coaxially mounted at the bottom of the spoke type sensor; three sample supports are symmetrically mounted on a stressed base; four support adjusting gaskets are symmetrically arranged under the stressed base along the center of the support framework. The bending toughness tester for the fiber reinforced concrete takes the servo motor as power, so that the problems of large noise and serious pollution of current hydraulic power are solved; the bending toughness tester for the fiber reinforced concrete is simple and convenient to operate and capable of easily testing the bending toughness tester of the fiber reinforced concrete.

The application relates to the technical field of building materials, and specifically discloses a high-ductility cement-based composite material and a preparation method thereof. A high-ductility cement-based composite material, comprising the following raw materials in parts by weight: 200-450 parts of cement, 100-350 parts of fly ash, 100-350 parts of mineral powder, 100-450 parts of aggregate, 20-45 parts of silica fume 5-25 parts of water reducing agent, 1-6 parts of defoamer, 0.1-0.8 parts of cellulose ether, 0.5-6 parts of spray regulator, 5-40 parts of polyvinyl alcohol fiber, 1000-3000 parts of water; The regulator includes magnesium aluminum silicate and starch ether in a weight ratio of (2-6):1. The compressive strength of the composite material 60d of the present application reaches 61.76N / mm 2 , The flexural strength reaches 19.44N / mm 2 , Bending strength reaches 15.10N / mm 2 , Bending toughness reaches 138.15KJ / m 3 , the strength and toughness of composite materials are better.