30results about How to "Make up for shrinkage" patented technology

The invention provides a water-borne epoxy resin modified cement mortar repair material and a preparation method thereof. According to the formula composition, the water-borne epoxy resin modified cement mortar repair material comprises materials in percentage by weight as follows: 27%-30% of cement, 56%-59% of sand, 0.8%-1.0% of an expanding agent, 0.5%-0.7% of silica fume, 5.0%-7.5% of water, 2.0%-5.0% of water-borne epoxy resin, 1.0%-2.5% of a curing agent, 0.19%-0.22% of an antifoaming agent and 0.14%-0.16% of a water reducing agent. The water-borne epoxy resin modified cement mortar repair material has the characteristics of short setting time, excellent fluidity, high anti-compression and anti-bending strength, seismic resistance, low shrinkage strain, good durability, good water resistance, simplicity in production, convenience in construction and the like, the particularly prominent properties include the ultrahigh bonding strength and the excellent durability, the bonding strength is 100%-200% higher than that of general modified cement mortar, and the cement mortar repair material can be suitable for repairing cracks of concrete structures and is particularly applicable to structural engineering such as a subway, a bridge, an airport runway, an aqueduct, a tunnel lining and the like with higher repair difficulties.

The invention discloses a narrow-face copper plate for a chamfer crystallizer. A working face of the narrow-face copper plate for the chamfer crystallizer comprises a first part and a second part; the first part is a sunken curved surface; the first part is a part on the working face in a range of 200mm to 400mm apart from an upper port of the crystallizer. The first part comprises a first curved surface region, two second curved surface regions and two transition curved surface regions, wherein the first curved surface region is a second degree parabola region; the two second curved surface regions are curved surfaces of which the crown heights are 1mm to 3mm; the two transition curved surface regions are curved surfaces with radii of 5mm to 35mm; the two transition curved surface regions are respectively connected with two opposite sides of the first curved surface region and the two second curved surface regions. The second part is connected with the first curved surface region, the two second curved surface regions and the two transition curved surface regions; the second part is a linear conical surface. The narrow-face copper plate for the chamfer crystallizer is also provided with a cooling waterway for cooling the working face; the distance between the cooling waterway and the edge, which is far away from the transition curved surface regions, on each second curved surface region is 20mm to 40mm; the distance between the cooling waterway and each transition curved surface region is 10mm to 30mm.

The invention relates to the technical field of continuous casting, in particular to a control method of transverse corner cracks of a casting blank of a chamfering crystallizer. The control method includes the steps that the spraying angle of spray nozzles on a first foot roll, a second foot roll, a third foot roll and a fourth foot roll relative to the casting blank is controlled to range from 95 degrees to 110 degrees; and the water flow of primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L/min to 600 L/min. According to the control method of the transverse corner cracks of the casting blank of the chamfering crystallizer, the spraying angles of the spray nozzles on the first foot roll, the second foot roll, the third foot roll and the fourth foot roll relative to the casting blank are controlled to range from 95 degrees to 110 degrees, the cooling effect of the chamfering portion of the casting blank of the chamfering crystallizer for microalloyed steel can be fully guaranteed, and meanwhile the influence on the following process of the casting blank is avoided; and in addition, the water flow of the primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L/min to 600 L/min, and the transverse corner cracks can be prevented from being generated on the casting blank of the chamfering crystallizer for the microalloyed steel.

The invention relates to siliceous stemming for filling a blast furnace taphole and a preparation method thereof, and belongs to the field of high-temperature metallurgical fireproof materials. The method comprises the following steps of: pre-mixing 35 to 45 mass percent of diaspore silicate, 16 to 27 mass percent of silicon carbide, 3 to 5 mass percent of micro powder, 10 to 18 mass percent of ball clay, 2 to 4 mass percent of graphite, 1 to 3 mass percent of plasticizer, 6 to 10 mass percent of ferrosilicon nitride, 2 to 4 mass percent of metal powder, 3 to 5 mass percent of modified asphalt powder and 3 to 5 mass percent of expanding agent aluminum silicate fine powder for later use, putting into a wheel roller and pre-rolling for 5 minutes; adding 15 to 20 mass percent of modified liquid tar, performing wheel rolling at a high speed for 30 to 35 minutes to ensure that a Marshall value is between 4 and 16MPa; and packaging, and measuring the Marshall value 3 days later, wherein the product is qualified when the Marshall value is between 8 and 24MPa. The problems of low high-temperature strength and high-temperature toughness of the stemming are solved, and the problems of a shallow iron notch, a broken iron notch and splashing are solved simultaneously.

The invention relates to a high-strength anti-freeze grouting material and a preparation method thereof. The high-strength anti-freeze grouting material is prepared from the following raw materials in parts by weight: 400 to 450 parts of composite cement, 400 to 500 parts of quartz sand, 40 to 60 parts of special steel fiber, 50 to 110 parts of pulverized slag powder, 20 to 40 parts of a composite expanding agent, 1 to 3 parts of a composite early strength agent, 2 to 7 parts of a polycarboxylate water reducing agent and 0.5 to 4 parts of a defoaming agent. The preparation method comprises the following steps: guiding the composite cement and the quartz sand in corresponding prehomogenization silos for carrying out prehomogenization, carrying out continuous blending according to weight proportions, and uniformly mixing the mixed material in a forced stirring machine, thus obtaining dry powder; then guiding the dry powder in a finished product homogenization silo; electronically metering, automatically packaging into a finished product, and conveying the finished product to a finished product silo. The high-strength anti-freeze grouting material obtained through the preparation method has the characteristics of good fluidity, high strength, minimum inflation, good anti-freeze performance and no toxicity and can well adapt to operation under a high and cold environment.

The invention provides a stair type expansion reinforcing band system and a construction method. The system comprises a concrete bed die. A concrete base body is poured to the upper end of the concrete bed die. Upper run-through reinforcing steel bars and lower run-through reinforcing steel bars are embedded in the concrete base body. Expansion reinforcing bands are arranged in the concrete base body. Post-poured expansive concrete is poured in the expansion reinforcing bands. The section of each expansion reinforcing band is in a slope stair shape. Stair type steel wire nets are attached to the two side walls of each expansion reinforcing band. The steel wire net on each side is fixedly connected with a stair type vertical reinforcing steel bar. The system is simple in structure, the construction method is simple and clear, operation is convenient, the system can be effectively used for expansion post-cast strip pouring construction of most concrete pouring, the problems of ultra-longcomponent cracking and construction joint area water seepage are solved, the construction quality is guaranteed, meanwhile, later rework steps are avoided, engineering cost is saved, and the construction schedule is quickened.

The invention belongs to the technical field of soil solidification, and relates to a coal-based solid waste soil solidifying agent and a preparation method thereof. The problem that when the fluidized bed combustion ash is used as a soil stabilizer, a structure is prone to shrinkage and cracking after curing is solved. The soil stabilizer comprises the following components in parts by weight: 50-80 parts of fluidized bed combustion ash, and 5-15% of silica fume, 3-5% of sulfate and sodium hydroxide, 0.1-0.5% of a water reducing agent and 0.3-0.6% of polyvinyl alcohol fiber which account for the mass percent of the fluidized bed combustion ash. The treated materials are stirred for 10-15 min at the rotating speed of 150-300 r/min, and mixed powder is obtained; under the action of the exciting agent, the secondary hydration reaction process of the mineral admixture and calcium hydroxide is accelerated, so that hydration products are crossed and overlapped with one another to form a compact network structure system, and a structure is prevented from shrinking and cracking.

The invention discloses a diatomite internal wall multifunctional lining. The diatomite internal wall multifunctional lining comprises the following components in weight ratio: 25.3%-57% of gel material, 25%-60% of functional filling, 15%-50% of normal filling, and 0.3%-3% of auxiliary, wherein the gel material is a ternary gelation system composed of sulphoaluminate cement, building gypsum and redispersible latex powder. The invention further provides a preparation method of the diatomite internal wall multifunctional lining, comprising feeding materials according to above ratio, metering and packaging. The diatomite internal wall multifunctional lining provided by the invention is notable in environmental protection, and basically zero in formaldehyde and VOC emission. The production process is simple, the cost is low, and the wall lining has good heat retaining property and a certain soundproof effect, and has universality to wall base and top coating, and is suitable for large-scale popularization and use in region with low heat retaining requirement.

The invention belongs to the technical field of wind tunnel experiment equipment. Aiming at the technical problem of high-temperature and high-pressure gas leakage caused by pipeline deformation or flange sealing failure due to bending moment formed on a connecting pipeline by a connecting mode in the prior art, the invention provides a valve connecting device for a wind tunnel experiment. The device is provided with a lifting device, the lifting device comprises a flange clamp, an elastic supporting mechanism and a sliding base, the lower end of the sliding base is fixed to the ground, the upper end of the sliding base is connected with the elastic supporting mechanism, the flange clamp is arranged at the top end of the elastic supporting mechanism, and the flange clamp is arranged on a connecting pipeline of a high-temperature valve in a sleeving mode to lock a high-temperature valve flange. With the device, the bending moment formed on the connecting pipeline due to longitudinal extension of a heat storage heater or the dead weight of a valve body during preheating can be greatly reduced, then the possibility of flange leakage at the hoop is avoided, and the the safety is greatly improved.

The invention discloses a construction method of shear resistance and strengthening of concrete box beams based on corrugated steel webs. The construction method successively comprises the following steps: performing construction lofting and positioning on top plates and bottom plates of box beams; performing and strengthening bonding surfaces; drilling anchor bolt holes in the bottom surfaces of the top plates of the box beams; drilling holes and planting steel bars in the top surfaces of the bottom plates of the box beams; performing laying-off on the corrugated steel webs; drilling holes and performing polishing on upper flange plates; welding and mounting the corrugated steel webs; mounting reinforced mesh slices; erecting a model and pouring concrete. The construction method disclosed by the invention has the advantage that the purposes of shear resistance and strengthening of the concrete box beams are achieved by mounting longitudinal corrugated steel web components in box chambers of box beams, increasing the number of webs of the box beams and reducing the main tensile stress of original concrete webs of the box beams.

The invention discloses a nanometer composite epoxy resin building material. The nanometer composite epoxy resin building material comprises 60 to 85 parts of cement, and 20 to 40 parts of an epoxy resin adhesive; the epoxy resin adhesive comprises, by weight, 80 to 90% of a composite epoxy resin, 6 to 10% of a curing agent, and 5 to 10% of a reactive diluent; after ring opening, a linear epoxy resin and 2,5-di(tetradecanoic acid ester) terephthalic acid are subjected to polymerization esterification so as to obtain an epoxy resin pre-modified body, aliphatic chains are introduced as flexiblechains, and linear epoxy resin flexibility is improved; nanometer modified cerium oxide is dispersed in the epoxy resin pre-modified body, so that acting force much higher than Van der Waals' force isachieved at the interface between nanometer modified cerium oxide and the hydroxyl and carboxyl of the epoxy resin pre-modified body, micro cracks and adsorption of energy are induced, epoxy resin system deformation is inhibited, and further toughening effect is achieved. When the nanometer composite epoxy resin building material is used in building materials, building material cracking possibility is reduced.