16results about How to "Fast hardening" patented technology

The invention discloses a tundish cover castable, and relates to the technical field of tundish refractory materials. The tundish cover castable is prepared from the following raw material components in percentage by mass: 7.8 to 9.6 percent of alumina of 8 to 5mm, 2.6 to 4.3 percent of alumina of 5 to 3mm, 2.6 to 4.3 percent of alumina of 1 to 0mm, 17.4 to 20.8 percent of alumina of 200 meshes, 9.6 to 13 percent of mullite of 5 to 3mm, 22.6 to 26 percent of mullite of 3 to 1mm, 9.6 to 13 percent of mullite of 1 to 0mm, 7 to 8.7 percent of mullite of 200 meshes, 2.6 to 3.5 percent of composite binding agent, 0.8 to 1.7 percent of aluminum silicate, 0.05 to 0.07 percent of SiC nanowire, 0.2 to 0.3 percent of aluminum titanate and the balance of water. The invention discloses a tundish cover castable which comprises the following components in percentage by weight: 0.4-0.7% of alumina micro powder, 0.08-0.11% of sodium tripolyphosphate, 2.6-3.5% of silica fume, 0.87% of steel fiber and 1.3-1.7% of high-alumina cement. Compared with a traditional process, the tundish cover castable has the advantages that the overall performance of the tundish cover castable is remarkably improved, the breaking strength and compression strength of the castable are effectively enhanced, the service life is remarkably prolonged, and the production cost is reduced. And the production cost is greatly saved, and the economical efficiency and the operation rate of continuous casting operation are improved.

The invention relates to the field of coal mine tunnel supporting, in particular to a coal mine tunnel slime water in-situ hardening device and method. The device comprises a slime water self-suction device, a stirring mechanism, a paving device, a walking mechanism and a feeding device, wherein the slime water self-suction device is used for sucking slime water on a bottom plate of an excavation roadway, the stirring mechanism is used for mixing and stirring the slime water and other materials into an in-situ hardening material, the paving device is used for paving the in-situ hardening material, and the walking mechanism is used for bearing the in-situ hardening device and can drive the in-situ hardening device to move. The feeding device is used for supplying in-situ hardening raw materials; the method comprises the steps that the inclination condition of a vehicle body is obtained in real time through cooperation of a laser transmitter, target paper and a camera, and leveling is conducted by adjusting the height of a leveling roller. According to the invention, the integration of extraction, stirring and paving can be realized, the problems of difficulty in pedestrians and driving and the like caused by excessive accumulation of coal slime on a bottom plate of a tunneling roadway are solved, the labor intensity of workers is reduced, and the tunneling efficiency is improved.

The present application aims at the problems of excessive consumption of traditional cement limestone resources, excessive energy consumption and high carbon emission, and provides a carbonated hardened low-calcium cement and a preparation and hardening method thereof, which is a hardening method for curing low-calcium cement by CO2 carbonation. The mass percentage composition of cement raw material components is: limestone: 60-70%, sandstone or clay or silica ash: 15-25%, phosphogypsum, fluorogypsum or desulfurization gypsum: 5-25%, component A: 0.5-2%. Component A is composed of the following raw material components in mass percentage: fluorite 0-50%, barium slag: 0-50%, lithium slag 0-50%, wood ash 0-50%, industrial sodium carbonate 0-30%. The composition design of carbonated hardened cement clinker minerals is C2S: 10-90%, C5S2$: 10-90%, C$: 0-5%, C4A3$: 0-10%, etc. In the present application, the limestone required for the cement clinker is lower than that of ordinary Portland cement clinker, the calcination temperature is reduced by 200-350 DEG C than that of ordinary Portland cement clinker, and the energy consumption and carbon emission are significantly lower than those of Portland cement; the low-calcium cement is hardened by CO2 carbonation curing, which can make the cement obtain excellent mechanical properties within 2 hours.

The invention discloses a cementing material as well as a preparation method and application thereof, and relates to the field of cementing materials. The cementing material comprises the following components in parts by mass: 0-40 parts of a first component, 10-50 parts of regenerated cement, 30 parts of a second component, 15 parts of carbonized waste incineration fly ash and 5 parts of dehydrated phosphogypsum, the first component comprises cement and / or concrete waste powder; the second component comprises calcined clay and / or calcined engineering residue soil; the regenerated cement is obtained by mechanically grinding concrete waste powder, or the regenerated cement is obtained by mechanically grinding and thermally treating the concrete waste powder; the carbonized waste incineration fly ash is obtained by performing carbonization treatment on waste incineration fly ash. The cementing material provided by the invention is a low-carbon cementing material, is relatively low in cost and high in hydration and hardening speed, has enough compressive strength, can be used instead of LC3, and has lower carbon emission compared with the LC3.

The invention discloses a calcium carbonate hardened body based on microwave heating maintenance as well as a preparation method and application thereof. The calcium carbonate hardened body based on microwave heating curing is prepared by curing vaterite and a crystal form regulating agent under a microwave heating condition for 5 minutes to 3 hours. The setting and hardening of the calcium carbonate phase change cementing material are accelerated in a microwave curing manner. Microwaves can penetrate into a calcium carbonate sample, so that the sample can be quickly and uniformly heated, calcium carbonate particles are dissolved and recrystallized, interfaces of the calcium carbonate particles are mutually fused, the structure is densified, and the strength of calcium carbonate cement is improved. The raw materials are wide in source and low in cost, and the hardening method is simple and easy to implement, so that the building material has wide application in the field of building materials, especially the field of low-carbon building materials.

The invention provides high-strength repairing cement and a preparation method thereof, and relates to the technical field of preparation of epoxy resin cement. The daub is composed of a component A and a component B in equal proportion, the component A is composed of epoxy resin, talcum powder, barium sulfate, modified graphite powder, calcium stearate, dodecylphenol and graded particle size quartz powder, and the component B is composed of a curing agent, talcum powder, barium sulfate and titanium dioxide. The defects in the prior art are overcome, the good adhesion effect of the cement is guaranteed, meanwhile, the mechanical strength of the hardened cement is effectively improved, and the repairing effect of the cement is comprehensively improved.

The present application relates to the technical field of concrete, and discloses an environmentally friendly fly ash and mineral powder double-mixed concrete, comprising the following raw materials by weight: 90-120 parts of cement, 40-70 parts of fly ash, 30-50 parts of mineral powder, 180-260 parts of machine-made sand, 100-150 parts of river sand, 350-500 parts of gravel, 85-100 parts of water, 3-15 parts of ethyl palmitate, and 2-8 parts of tea polyphenols. The environmentally friendly fly ash and mineral powder double-mixed concrete prepared by the present application using components with specific contents has excellent comprehensive performance, high early strength and stable performance.

The invention provides a variable temperature foaming-based assembled energy-saving thermal insulation board, which is prepared from the following raw materials in parts by mass: 60 to 80 parts of blast furnace slag powder, 10 to 20 parts of solid waste-based sulfur aluminum iron series gelling clinker, 10 to 25 parts of original byproduct gypsum, 2 to 6 parts of silica fume, 0.5 to 2 parts of carbide slag, 0.5 to 1.2 parts of calcium stearate, 0.2 to 0.6 part of polycarboxylate superplasticizer and 0.02 to 0.1 part of xanthan gum. 0.2 to 1 part of dispersible latex powder, 0.1 to 0.5 part of chopped fiber, 0.02 to 0.06 part of composite retarder, and a foaming agent; according to the method, hydrogen peroxide is selected as a foaming agent, and due to the low alkalinity characteristic of a gelling system, the hydrogen peroxide cannot be quickly decomposed after being added, so that the stirring time after the hydrogen peroxide is added can be prolonged, and meanwhile, it is guaranteed that fresh slurry has the high flow state characteristic. After the mixed slurry is poured into a mold, decomposition of hydrogen peroxide is catalyzed by applying a medium-temperature heat source, and at the moment, the foaming expansion process of the fresh slurry is parallel to the curing and hardening process, so that controllable regulation and control of the foaming process are realized, and the hardening speed of the slurry is increased. Finally, the solid waste-based energy-saving thermal insulation board for the fabricated building is prepared on the basis of variable-temperature foaming.

The invention provides an inorganic binder sand hardening process method and application, and the inorganic binder sand hardening process method comprises the following steps: hardening molded inorganic binder sand by adopting one of the following modes: mode I, blowing in a vaporized organic curing agent and at least one of CO2 and compressed air to carry out blowing hardening on the molded inorganic binder sand; in the second mode, the formed inorganic binder sand is subjected to primary hardening by blowing CO2 and compressed air, and then the inorganic binder sand is immersed into an organic curing agent to be subjected to secondary hardening; thirdly, the formed inorganic binder sand is immersed in an organic curing agent to be hardened; mode 4, spraying an organic curing agent on the surface of the formed inorganic binder sand for hardening; alternatively, the method comprises the following steps: forming inorganic binder sand from the crude sand, the binder and the organic curing agent in a layer-by-layer 3D printing manner, and hardening at the same time. According to the method, the hardening rate and quality of the inorganic binder sand can be greatly improved.

The invention discloses a UHPC (Ultra High Performance Concrete) and carbon fiber grating net reinforced concrete column structure, which relates to the technical field of bridge reinforcement and comprises a concrete matrix, a steel structure, a UHPC bonding layer, a carbon fiber grating net and a UHPC reinforcing layer. The invention provides a structure for reinforcing a concrete column by using UHPC (Ultra High Performance Concrete) and a carbon fiber grating net, which is used for overcoming the defects of an existing concrete column reinforcing method in the aspects of aging resistance, high temperature resistance, moisture resistance and the like, and effectively avoiding the consequence of collapse caused by overlarge stress.

The application relates to a composite high-strength supporting material and a preparation method and construction process thereof. Tailings sand powder in the application plays a certain lubricating role in the system and can reduce the slurry viscosity; the prepared special polycarboxylic acid water reducing agent has a micro-crosslinking structure and multiple adsorption groups, has extremely strong adsorption capacity on cement and tailings sand, and can reduce the slurry viscosity; the prepared organic polymer can quickly form an interpenetrating network structure with the cement-based material on the sprayed base surface, improves the slurry adhesion speed, reduces the spraying rebound rate, and effectively improves the strength, heat resistance, flame resistance and surface protection capacity of the target supporting material by introducing rigid / heat-resistant structures, flame-resistant structures and hydrophobic structures; the prepared high-strength supporting material has super-high compressive strength and bonding strength, fast hardening speed after spraying, excellent anti-cracking performance and good durability, improves the utilization rate of solid waste resources, has a simple and convenient construction process and high efficiency, and is suitable for construction in various complex environments.

The working box assembly applied to the 3D printing equipment is characterized in that the working box assembly comprises a working box body, a lifting bottom plate and a curing mechanism, the working box body is a frame-shaped structural part defined by a plurality of side plates, and the lifting bottom plate is movably arranged in the working box body; a plurality of first ventilation grooves are formed in at least one side plate at intervals, ventilation nets are laid on the first ventilation grooves, the curing mechanism comprises a sealing cover and an air supply device, the sealing cover covers the outer side faces of the side plates, one end of the air supply device communicates with the sealing cover, and the other end of the air supply device communicates with the air supply device. And the air supply device is communicated with the first ventilation groove through the sealing cover. According to the scheme, the problem that an existing binder jet printing product is difficult to cure, uneven in curing and low in curing efficiency, and consequently the product quality is poor can be solved.

The invention discloses a calcareous material special for autoclaved aerated concrete and a preparation method thereof, the calcareous material comprises 90-96 wt% of limestone, 2-6 wt% of an iron raw material, 0-2 wt% of gypsum and 0-2 wt% of a silicon-aluminum material, and the calcareous material comprises the following minerals in percentage by mass: 42-55 wt% of f-CaO, 0-3 wt% of C4A3S, 22-45 wt% of the sum of the contents of C2S and C3S, 5-20 wt% of the sum of the contents of C3A and C4AF, 0-1.5 wt% of periclase and 0-2 wt% of gypsum, and the content of other impurity minerals is 0-6wt%. By optimizing mineral components and particularly controlling the content and activity of f-CaO, the content of silicate minerals is ensured, so that the proportion of the mineral components is beneficial to process production and quality control of the aerated concrete; the utilization rate of the calcium raw material is improved and the energy consumption is reduced through low-temperature calcination of a novel dry-process kiln.

The invention relates to a method for regulating and controlling the rheological property of 3D printing concrete. The method comprises the following steps: S1, preparing concrete printing slurry; the concrete printing slurry is prepared from the following components in parts by weight: 75 to 100 parts of cement clinker, 75 to 125 parts of aggregate, 0 to 25 parts of mineral admixture, 0 to 1 part of concrete admixture and 25 to 40 parts of water, s2, the concrete printing slurry is input into a pressurized carbonization stirrer, and CO2 is introduced after sealing; and S3, when the air pressure of CO2 is 0.05-0.5 MPa, pressurizing, carbonizing and stirring to obtain the concrete material with high constructability. Compared with the prior art, the concrete slurry is pressurized, carbonized and stirred before 3D printing of the concrete slurry, so that the concrete material can be effectively promoted to be converted from high working performance to high constructability, and the contradiction of the concrete material in rheological properties during transportation, pumping and printing is solved. Meanwhile, part of industrial waste gas with the high CO2 content can be consumed, and carbon emission of 3D printing buildings can be further reduced.

This invention relates to a nano-metakaolin-modified hydraulic lime-based composite material and its preparation and application. The composite material comprises natural hydraulic lime and nano-metakaolin dispersed in the natural hydraulic lime, wherein the mass ratio of natural hydraulic lime to nano-metakaolin is (60-90):(10-40). The nano-metakaolin-modified hydraulic lime-based composite material of this invention exhibits controllable dispersibility and fluidity in the slurry after mixing with water. It also demonstrates good rock compatibility, low soluble salt content, controllable curing time, suitable post-curing strength, low permeability, and low shrinkage and expansion rate. The presence of a repair agent can specifically enhance the additional protective performance of the reinforcement material. It possesses high applicability, safety, and durability for the protection of stone cultural relics, without causing derivative damage.

This utility model discloses a construction structure for a dry-installation, quick-setting waterproof integrated panel for bathrooms. It includes, sequentially arranged on the floor slab, an interface agent layer, a quick-drying thick self-leveling mortar layer, a JS waterproof layer, a waterproof backing board layer, a tile adhesive layer, and an anti-slip tile layer. The quick-drying thick self-leveling mortar layer is a building material composed of ordinary silicate cement, aluminum sulfate cement, calcium oxide, fine perlite, and dried river sand. The quick-drying thick self-leveling mortar layer is poured onto the interface agent layer, and the JS waterproof layer is applied onto the quick-drying thick self-leveling mortar layer. The waterproof backing board layer is assembled from extruded polystyrene boards and is fixed to the JS waterproof layer using studded adhesive strips. This application uses the quick-drying thick self-leveling mortar layer and the waterproof backing board layer as leveling layers, featuring fast construction and fast hardening speed. Initial setting occurs within two hours after construction, and people can walk on it after four hours. The leveling layer is then formed by bonding the waterproof backing board layer. The construction is simple, convenient, and efficient.