57 results about "Cem cement" patented technology

The invention relates to a gypsum-cement binding material and a production method thereof. The material contains gypsum binding material, active admixture, alkaline excitant, oagulation accelerator, lime, water-reducing agent, early-strength agent and gypsum hemihydrate. The weight proportions of the components are as follows: 40%-80% of gypsum binding material, 10%-45% of active admixture, 4%-15% of alkaline excitant, 0-6% of coagulation accelerator, 0-1% of early-strength agent, 0-1% of water-reducing agent, 0-5% of lime and 0-10% of gypsum hemihydrate. The production method comprises the following steps: weighing raw materials at the given ratio, mixing all raw materials, and packaging. The inventive gypsum-cement material has high strength, good water resistance and good volume stability; and can be used as masonry cement, cement mortar, gypsum plaster, jointing gypsum and heat-insulating mortar.

Disclosed is a method for repairing a tree hole by manufacturing a plastic thermal expansion bucket through a moving type extruder and pouring cement. The extruder is moved to a site, and the manufactured plastic thermal expansion bucket is put into the tree hole immediately; the wall of the thermal expansion bucket is blown to be heated through a hot air gun while the thermal expansion bucket is hot; the bucket wall expands when heated so as to be closely attached to the hole wall of the tree hole; metal tie bars and fixing screws are arranged in the cracked tree hole; the cement is poured in the bucket; after the cement is dried, a bucket opening is covered by a plastic plate; the hot air gun is used to blow the bucket edge and the plastic plate to melt and laminate the bucket edge and the plastic plate together; the cement plays a role in repairing and supporting; the tie bars tighten a circle of a trunk to be together to enable the trunk to be a whole trunk; plastic covers the cement so that the cement cannot absorb and evaporate water and conduct chemical reaction, and accordingly the tree hole is repaired by the cement; the plastic bucket wall does not affect growing of a tree; and wood pieces are additionally pasted on the opening-sealed plastic plate, the wood pieces are beneficial for growing and healing of bark, and finally the bark covers the plastic thermal expansion bucket and cement in a tree core to enable the big tree to be integral and grow normally.

The invention discloses a preparation method of a cement-based shape-stabilized phase change material, belonging to the technical field of preparation of phase-change materials. According to the invention, the cementitious characteristic of cement and the water solubility of a phase-change material polyethylene glycol are utilized; the cement is blended with an aqueous polyethylene glycol solutionand undergoes a hydration reaction with water in the solution, and the polyethylene glycol is gradually crystallized and separated out due to supersaturation and is wrapped by a generated hydration product; and when the cement is finally hydrated, the polyethylene glycol is firmly packaged by the hydration product. The cement-based shape-stabilized phase change material disclosed by the inventionhas the advantages of high phase change material encapsulation rate, good stability, simple preparation process, low cost and the like, and can be widely applied to the fields of heat energy storage,building energy conservation and the like. The hydration of the cement and the crystallization and precipitation of the polyethylene glycol are carried out at the same time, so the hydration productand a polyethylene glycol chain segment are intertwined; and thus, a stable packaging system is formed, and the prepared cement-based shape-stabilized phase change material is prevented from leaking when phase change occurs.

The invention discloses a preparation and using method of steam-curing alkali-activated cement. A small amount of industrial alkali and potassium sodium aluminosilicate and limestone are mixed and ground to be calcinated under the temperature of 1,250-1,300 DEG C and quenched to obtain a clinker, the clinker is ground into powder and evenly mixed into 3.0-12.0% of sodium silicate with the modulusbeing 1.0-3.2 to obtain cement, the cement is steamed and cured under the temperature of 50-80 DEG C for 8-24 h after being mixed with water to be uniform, and a high-intensity hardening body is obtained. The prepared cement has the advantages that hardening is rapid, the strength is high, raw materials are wide, the cost is low, consumption is low, low-carbon emission is achieved, and the performance is stable and easy to control, and the method is particularly suitable for preparing prefabricated parts.

The invention discloses a high-performance self-compacting concrete for rapid repair as well as a preparation method and application thereof, and belongs to the field of concrete materials. The high-performance self-compacting concrete is prepared by mixing and homogenizing special cement, cement, fly ash, mineral powder, gypsum, coarse aggregate, fine aggregate, a polycarboxylic acid concrete water reducer and VAE emulsion. The concrete is used as bridge expansion joint concrete, section thickening concrete or concrete under the conditions of narrow space and dynamic load, has the characteristics of super early strength, no shrinkage, high wear resistance, high adhesion, high toughness, high impact resistance, high durability and high workability, and effectively fills up the blank of theconcrete raw material industry.

The invention discloses a preparation method of mortar with efficient water-resisting, moisture-resisting expanding, crack-resisting and seepage preventing functions. The preparation method is characterized by comprising the following steps: weighing raw materials cement, a cement compound additive, sands, polypropylene fibers and a naphthalene water reducer; putting the raw materials in a cone-shaped double helix stirrer in proportion, uniformly stirring for 50 minutes and stirring to obtain the mortar. The mortar disclosed by the invention has the efficient water-resisting, moisture-resisting, expanding, crack-resisting and seepage preventing functions and is free of corrosive action to reinforcing steel bars.

The invention discloses a method for preparing nanoscale cement. The method includes the following steps that firstly, moisture is controlled; secondly, ball hamming type ball milling grinding is conducted, wherein cement in the first step serves as raw materials, the ratio of grinding balls to the raw materials is 2 to 1, the grinding balls and the raw materials are placed into a hanging spring type double-barrel liquid cooling micro-nano ball mill grinding tank for high-energy ball hamming type sealed ball milling, and ball materials are separated and packaged through a 100-mesh screen. In the first step, two methods are adopted for controlling the moisture, firstly, cement needing to be prepared are selected and dried for 4 hours in a 120-DEG C electrothermal drying device; secondly, co-milling cement containing high polymers or fibers is prepared, additive is added to the cement, the added additive accounts for 0.25% to 2% of the cement, the cement is dehumidified for 6 hours in a sealed environment, and through the two methods, the moisture content of the cement is smaller than 3%. The method has the following advantages that the nanoscale cement can enter a hypotonic stratum with gaps with the diameter below the micrometer scale or concrete gaps; compressive strength is improved by 3 times; a microstructure with gas phase permeability lower than one or more times fundamentally changes.

The invention relates to sulfate-corrosion-resistant cement and cement mortar in a marine environment as well as a preparation method and application thereof. The cement is prepared from the followingraw material components in parts by weight: 25-35 parts of shell lime powder, 15-20 parts of anhydrite and 40-50 parts of calcined ball clay, wherein the calcined ball clay is ball clay subjected tocalcination treatment. The preparation method comprises the following steps: calcining shells, grinding anhydrite and ball clay, calcining the ball clay, and mixing the calcined ball clay with anhydrite and shell lime powder. The problem that in the prior art, a high-pressure jet grouting pile is severely corroded by sulfate in the marine environment, and consequently the foundation reinforcing effect is poor is solved.

The invention provides a set cement curing mold. The set cement curing mold comprises a top plate, a plurality of partition plates, a bottom plate, connecting rods and a curing cylinder. A curing cylinder is clamped between every two of the top plate, the plurality of partition plates and the bottom plate; the grouting holes in the two corresponding plates are communicated with the curing barrel;when set cement curing is carried out, cement is poured from the grouting holes in the top plate, all the curing cylinders in the whole mold can be filled with the cement, then all the plates can be tightly pressed and locked through the connecting rods so that the sealing performance of cement forming can be guaranteed, the connecting rods are detached after cement curing forming, the top plate and all the partition plates are knocked out in sequence, and set cement with the complete structure can be obtained. The dynamic gas corrosion experiment device comprises a curing kettle, a rotary base, a heater and the set cement curing mold, set cement with a complete structure is tested in the dynamic gas corrosion experiment device, and the corrosion condition and the service life of well cementation cement paste injected into an actual stratum can be reflected more truly.

The invention discloses a special concrete material and a preparation method and application thereof and belongs to the field of concrete materials. The special concrete material is prepared by mixingand homogenizing special cement, cement, fly ash, mineral powder, gypsum, coarse aggregate, fine aggregate, a polymer additive and a functional additive. The special concrete material is used as bridge expansion joint concrete, section thickened concrete or concrete under the conditions of narrow space and dynamic load, has the characteristics of super early strength, no shrinkage, high wear resistance, high adhesion, high toughness, high impact resistance, high durability and high workability, and effectively fills up the blank of the concrete raw material industry.

The invention discloses a reinforced building pile foundation in the field of building pile foundations, and the reinforced building pile foundation comprises an outer pile, a spiral piece is mounted on the outer wall of the outer pile, a drill bit is mounted at the bottom end of the outer pile, a thread is arranged on the outer wall of the drill bit, and a second cavity is formed in the outer pile. The outer pile driving efficiency is improved through the spiral piece and the drill bit, the spiral piece forms tension to the ground, the outer pile cannot move, and the pile foundation strength and the shock resistance and pressure resistance are effectively improved; a plurality of clamping blocks are arranged on the outer wall of an inner pile, a plurality of steel bars are arranged in the clamping blocks, fixing blocks are arranged between the clamping blocks, and reinforcing columns are arranged in the fixing blocks, so that the strength of the inner pile is enhanced, cement is poured into the inner pile through cement pipes in connecting columns, the cement is input into a first cavity and a second cavity through holes in the outer wall of the inner pile, and the inner pile and an outer pile are fixed; the strength of the inner pile and the outer pile and the pile foundation stability are effectively improved.

The invention discloses a method for preparing a wall thermal insulation material from industrial solid waste. The method comprises the following steps: respectively drying, grinding and screening copper slag, fly ash and phosphogypsum to 80-100 meshes; proportioning according to a certain proportion and a certain adding sequence; selecting quick lime as an exciting agent, and selecting a mixtureof alpha-olefin sodium sulfonate, sodium dodecyl benzene sulfonate and sodium alcohol ether sulphate as a foaming agent; and sequentially mixing quick lime, a small amount of water, phosphogypsum andauxiliary materials, cement and a cement foaming agent to prepare slurry, molding by casting, naturally standing and drying for 24 hours, and heating and drying in a thermostat for 24 hours to obtainthe building wall thermal insulation material. The method has the advantages that the solid waste phosphogypsum is not subjected to desulfurization treatment, the copper slag is directly utilized, andother auxiliary raw materials are added to react with substances in the copper slag, so that an impurity removal effect is achieved; three anionic surfactants with less research are selected as the cement foaming agent; and the process is simple and easy to implement, and the prepared thermal insulation material is natural, pollution-free and excellent in performance.

The invention provides a mechanical energy storage vibration well cementation device and a using method and a testing device thereof, the vibration well cementation device comprises an energy conversion device, an energy storage device, a vibration shaft, an overload protection device and an energy release triggering device, the energy conversion device is used for converting fluid kinetic energy into kinetic energy of the shaft and driving the vibration shaft to rotate to generate vibration; the energy storage device is used for converting kinetic energy of the shaft into elastic potential energy and storing the elastic potential energy; the overload protection device has an overload protection effect on the energy storage device; and during cement setting waiting, the mechanical potential energy stored by the energy storage device is released through the energy release triggering device to generate radial vibration, so that vibration in the whole process of cement injection, cement paste replacement and cement setting waiting is realized. According to the device, fluid kinetic energy is converted into mechanical potential energy to be stored and eccentric vibration is generated in the cementing and cement paste displacement process, the compactness and uniformity of the cement paste are further improved, the well cementation technology does not need to be changed, underground power equipment does not need to be changed, the design is simple, and the cost is low.

Compositions and methods for grinding inorganic particles, such as cement, cement clinker, limestone, or other inorganic particles, involving a grinding efficiency enhancing additive comprising a crude glycerin byproduct, obtained through the use of heterogeneous catalyst processes in biodiesel fuel production. The molecules generated through the use of such heterogeneous catalytic processes result in a crude glycerin that confers good additive formulation stability, while avoiding or minimizing large quantities of undesirable compounds such as fatty acids, fatty acid esters, and salts.